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Publications dans les journaux scientifiques dans le domaine de l'ingénierie : 05-2017 trié par par titre, page: 2
» ARFTG 2017
Résumé:
Provides a notice of upcoming conference events of interest to practitioners and researchers.
Auteurs: Peter H. Aaen;Nick Ridler;
Apparue dans: IEEE Microwave Magazine
Date publication: 05.-2017, volume: 18, issue:3, pages: 98 - 100
Editeur: IEEE
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» ASRQ: Automatic Segment Repeat Request for IEEE 802.15.4-Based WBAN
Résumé:
In a wireless body area network (WBAN), high data reliability and long operating time are important requirements. The retransmission process of the default Automatic Repeat reQuest (ARQ) mechanism in IEEE 802.15.4 is a suitable method to ensure the data reliability of WBAN communications, where frame loss can occur frequently. However, retransmitting the entire DATA frame is energy inefficient due to the fact that the most of payload data within lost frames are only partially corrupted. Therefore, this paper proposes the automatic segment repeat request scheme for the IEEE 802.15.4-based WBANs. The proposed scheme partitions the data payload into segments when the channel condition is bad, and retransmits only the corrupted segment(s). This reduces the size of the retransmitted frames, which improves frame reception rate and decreases the amount of transmitted traffic, and thus energy consumption. Our experiments using a real IEEE 802.15.4-based WBAN test bed show that the proposed method provides higher transmission reliability and lower power consumption than the default IEEE 802.15.4 ARQ mechanism.
Auteurs: Byoungseon Kim;Ben Lee;Jinsung Cho;
Apparue dans: IEEE Sensors Journal
Date publication: 05.-2017, volume: 17, issue:9, pages: 2925 - 2935
Editeur: IEEE
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» Assessment of the Electrical Performance of Short Channel InAs and Strained Si Nanowire FETs
Résumé:
We present a numerical study aimed to benchmark short gate InAs nanowire-FETs (NW-FETs) against their strained Si (sSi) counterpart. Our full-quantum simulations focus on both gate-length scaling and device variability and include the impact of electron–phonon scattering and surface roughness (SR). Interestingly, we found that SR improves the subthreshold-voltage swing (SS) of short gate-length InAs devices by inducing a reduced source-to-drain tunneling. Hence, InAs NW-FETs exhibit a larger immunity to the roughness-induced degradation of the ON-current, whereas they suffer froma larger OFF-current and SS variabilitywith respect to the sSi ones. According to our results, InAs NW-FETs could compete with sSi NW-FETs only for very short gate lengths, when the device performance is significantly degraded, while for longer devices sSi NW-FETs remain a more effective and reliable choice due to the higher gate overdrive charge.
Auteurs: Corentin Grillet;Demetrio Logoteta;Alessandro Cresti;Marco G. Pala;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 2425 - 2431
Editeur: IEEE
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» Asymmetric Junctions in Metallic–Semiconducting–Metallic Heterophase MoS2
Résumé:
Symmetry of the source–channel and drain–channel junction is a unique property of a metal-oxide-semiconductor field effect transistor (MOSFET), which needs to be preserved while realizing sub-decananometer channel length devices using advanced technology. Employing experimental-findings-driven atomistic modeling techniques, we demonstrate that such symmetry might not be preserved in an atomically thin phase-engineered MoS2-based MOSFET. It originates from the two distinct atomic patterns at phase boundaries ( $beta $ and $beta $ *) when the semiconducting phase (channel) is sandwiched between the two metallic phases (source and drain). We develop a geometrically optimized atomic model of two independent heterophase structures comprising $beta $ and $beta $ * interfaces and study their electrical characteristics using density functional theory-nonequilibriumGreen’s function formalism. We further study the effect of semiconductor doping on the transmission of those planar devices and show that irrespective of the doping concentration, these heterophase structures exhibit asymmetric barrier heights. Our findings could be useful for designing integrated circuits using such advanced transistors.
Auteurs: Dipankar Saha;Santanu Mahapatra;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 2457 - 2460
Editeur: IEEE
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» Asymptotic Stability of Perturbation-Based Extremum-Seeking Control for Nonlinear Plants
Résumé:
We introduce a perturbation-based extremum-seeking controller for general nonlinear dynamical plants with an arbitrary number of tunable plant parameters. The controller ensures asymptotic convergence of the plant parameters to their performance-optimizing values for any initial plant condition under the assumptions in this work. The key to this result is that the amplitude and the frequencies of the perturbations, as well as other tuning parameters of the controller, are time varying. Remarkably, the time-varying tuning parameters can be chosen such that asymptotic convergence is achieved for all plants that satisfy the assumptions, thereby guaranteeing stability of the resulting closed-loop system of plant and controller regardless of tuning.
Auteurs: Mark Haring;Tor Arne Johansen;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2302 - 2317
Editeur: IEEE
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» Asynchronous Distributed Optimization Via Randomized Dual Proximal Gradient
Résumé:
In this paper we consider distributed optimization problems in which the cost function is separable, i.e., a sum of possibly non-smooth functions all sharing a common variable, and can be split into a strongly convex term and a convex one. The second term is typically used to encode constraints or to regularize the solution. We propose a class of distributed optimization algorithms based on proximal gradient methods applied to the dual problem. We show that, by choosing suitable primal variable copies, the dual problem is itself separable when written in terms of conjugate functions, and the dual variables can be stacked into non-overlapping blocks associated to the computing nodes. We first show that a weighted proximal gradient on the dual function leads to a synchronous distributed algorithm with local dual proximal gradient updates at each node. Then, as main paper contribution, we develop asynchronous versions of the algorithm in which the node updates are triggered by local timers without any global iteration counter. The algorithms are shown to be proper randomized block-coordinate proximal gradient updates on the dual function.
Auteurs: Ivano Notarnicola;Giuseppe Notarstefano;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2095 - 2106
Editeur: IEEE
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» Attention-Weighted Texture and Depth Bit-Allocation in General-Geometry Free-Viewpoint Television
Résumé:
In a free-viewpoint television network, each viewer chooses its point of view from which to watch a scene. We use the concept of total observed distortion, wherein we aim to minimize the distortion of the view observed by the viewers as opposed to the distortion of each camera, to develop an optimized bit-rate allocation for each camera. Our attention-weighted approach effectively gives more bits to the cameras that are more watched. The more concentrated the viewer distribution, the larger the bit-rate savings, for a given total observed distortion, compared with the uniform rate allocation. We analyze and model the distortion of a synthesized view as a function of the distortions (both in texture and/or depth) of the nearby cameras. Based on such models, we develop optimal rate-allocation methods for texture images, considering a uniform bit allocation for depth, and for both texture and depth simultaneously. Simulation results are shown, demonstrating not only the correctness of the optimized solution, but also measuring its improvement against uniform rate allocation for a few viewer distributions.
Auteurs: Camilo Dorea;Ricardo L. de Queiroz;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 1055 - 1065
Editeur: IEEE
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» Attentive Contexts for Object Detection
Résumé:
Modern deep neural network-based object detection methods typically classify candidate proposals using their interior features. However, global and local surrounding contexts that are believed to be valuable for object detection are not fully exploited by existing methods yet. In this work, we take a step towards understanding what is a robust practice to extract and utilize contextual information to facilitate object detection in practice. Specifically, we consider the following two questions: “how to identify useful global contextual information for detecting a certain object?” and “how to exploit local context surrounding a proposal for better inferring its contents?” We provide preliminary answers to these questions through developing a novel attention to context convolution neural network (AC-CNN)-based object detection model. AC-CNN effectively incorporates global and local contextual information into the region-based CNN (e.g., fast R-CNN and faster R-CNN) detection framework and provides better object detection performance. It consists of one attention-based global contextualized (AGC) subnetwork and one multi-scale local contextualized (MLC) subnetwork. To capture global context, the AGC subnetwork recurrently generates an attention map for an input image to highlight useful global contextual locations, through multiple stacked long short-term memory layers. For capturing surrounding local context, the MLC subnetwork exploits both the inside and outside contextual information of each specific proposal at multiple scales. The global and local context are then fused together for making the final decision for detection. Extensive experiments on PASCAL VOC 2007 and VOC 2012 well demonstrate the superiority of the proposed AC-CNN over well-established baselines.
Auteurs: Jianan Li;Yunchao Wei;Xiaodan Liang;Jian Dong;Tingfa Xu;Jiashi Feng;Shuicheng Yan;
Apparue dans: IEEE Transactions on Multimedia
Date publication: 05.-2017, volume: 19, issue:5, pages: 944 - 954
Editeur: IEEE
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» Attributed Scattering Center Extraction Algorithm Based on Sparse Representation With Dictionary Refinement
Résumé:
Compared with the point-scattering model, the attributed scattering center model (ASCM) is able to describe the frequency and aspect dependence of canonical scattering objects using solutions from both physical optics and the geometric theory of diffraction. As the ASCM is complicated, it may increase the dimension of the parameterized dictionary, which will increase the cost of computation and storage significantly. Aiming at this problem, a novel sparse representation-based algorithm, combined with an alternative optimization and dictionary refinement, is proposed. Utilizing the orthogonal matching pursuit algorithm combined with relaxation algorithm, the solution to the sparse signal recovery problem can be obtained. Numerical results on both electromagnetic computation data and measured SAR data verify the validity of the proposed algorithm.
Auteurs: Hongwei Liu;Bo Jiu;Fei Li;Yinghua Wang;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2604 - 2614
Editeur: IEEE
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» Attribution Mechanisms for Ancillary Service Costs Induced by Variability in Power Delivery
Résumé:
The increased penetration of renewable energy sources in existing power systems has led to necessary developments in electricity market mechanisms. Most importantly, renewable energy generation is increasingly made accountable for deviations between scheduled and actual energy generation. However, there is no mechanism to enforce accountability for the additional costs induced by power fluctuations. These costs are socialized and eventually supported by electricity customers. We propose some metrics for assessing the contribution of all market participants to power regulation needs, as well as an attribution mechanism for fairly redistributing related power regulation costs. We discuss the effect of various metrics used by the attribution mechanisms, and we illustrate, in a game-theoretical framework, their consequences on the strategic behavior of market participants. We also illustrate, by using the case of Western Denmark, how these mechanisms may affect revenues of the various market participants.
Auteurs: Francesca Bona;Nicolas Gast;Jean-Yves Le Boudec;Pierre Pinson;Dan-Cristian Tomozei;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 1891 - 1901
Editeur: IEEE
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» Auditory-Inspired Speech Envelope Extraction Methods for Improved EEG-Based Auditory Attention Detection in a Cocktail Party Scenario
Résumé:
This paper considers the auditory attention detection (AAD) paradigm, where the goal is to determine which of two simultaneous speakers a person is attending to. The paradigm relies on recordings of the listener’s brain activity, e.g., from electroencephalography (EEG). To perform AAD, decoded EEG signals are typically correlated with the temporal envelopes of the speech signals of the separate speakers. In this paper, we study how the inclusion of various degrees of auditory modelling in this speech envelope extraction process affects the AAD performance, where the best performance is found for an auditory-inspired linear filter bank followed by power law compression. These two modelling stages are computationally cheap, which is important for implementation in wearable devices, such as future neuro-steered auditory prostheses. We also introduce a more natural way to combine recordings (over trials and subjects) to train the decoder, which reduces the dependence of the algorithm on regularization parameters. Finally, we investigate the simultaneous design of the EEG decoder and the audio subband envelope recombination weights vector using either a norm-constrained least squares or a canonical correlation analysis, but conclude that this increases computational complexity without improving AAD performance.
Auteurs: Wouter Biesmans;Neetha Das;Tom Francart;Alexander Bertrand;
Apparue dans: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Date publication: 05.-2017, volume: 25, issue:5, pages: 402 - 412
Editeur: IEEE
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» Autocalibrated Sampling Rate Conversion in the Frequency Domain [Tips & Tricks]
Résumé:
Frequency-domain sampling rate conversion (SRC) can be conveniently implemented by manipulating the discrete Fourier transform (DFT) of the input signal. This method has achieved the advantages of using less computation to obtain more accurate converted output. Conversion errors are mainly produced from the formulation process of the DFT of the output signal. This article presents a sparsity-based scheme to appropriately and automatically calibrate the conversion errors to make further improvement on the conversion accuracy at the cost of more computational complexity. The experimental results demonstrate that the proposed scheme can significantly decrease the meansquare errors (MSEs) and is particularly effective on minimizing the MSEs of phase spectrum.
Auteurs: Lifan Zhao;Xiumei Li;Lu Wang;Guoan Bi;
Apparue dans: IEEE Signal Processing Magazine
Date publication: 05.-2017, volume: 34, issue:3, pages: 101 - 106
Editeur: IEEE
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» Autofocusing and Polar Body Detection in Automated Cell Manipulation
Résumé:
Autofocusing and feature detection are two essential processes for performing automated biological cell manipulation tasks. In this paper, we have introduced a technique capable of focusing on a holding pipette and a mammalian cell under a bright-field microscope automatically, and a technique that can detect and track the presence and orientation of the polar body of an oocyte that is rotated at the tip of a micropipette. Both algorithms were evaluated by using mouse oocytes. Experimental results show that both algorithms achieve very high success rates: 100% and 96%. As robust and accurate image processing methods, they can be widely applied to perform various automated biological cell manipulations.
Auteurs: Zenan Wang;Chen Feng;Wei Tech Ang;Steven Yih Min Tan;Win Tun Latt;
Apparue dans: IEEE Transactions on Biomedical Engineering
Date publication: 05.-2017, volume: 64, issue:5, pages: 1099 - 1105
Editeur: IEEE
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» Automated Assessment of Disease Progression in Acute Myeloid Leukemia by Probabilistic Analysis of Flow Cytometry Data
Résumé:
Objective: Flow cytometry (FC) is a widely acknowledged technology in diagnosis of acute myeloid leukemia (AML) and has been indispensable in determining progression of the disease. Although FC plays a key role as a posttherapy prognosticator and evaluator of therapeutic efficacy, the manual analysis of cytometry data is a barrier to optimization of reproducibility and objectivity. This study investigates the utility of our recently introduced nonparametric Bayesian framework in accurately predicting the direction of change in disease progression in AML patients using FC data. Methods: The highly flexible nonparametric Bayesian model based on the infinite mixture of infinite Gaussian mixtures is used for jointly modeling data from multiple FC samples to automatically identify functionally distinct cell populations and their local realizations. Phenotype vectors are obtained by characterizing each sample by the proportions of recovered cell populations, which are, in turn, used to predict the direction of change in disease progression for each patient. Results: We used 200 diseased and nondiseased immunophenotypic panels for training and tested the system with 36 additional AML cases collected at multiple time points. The proposed framework identified the change in direction of disease progression with accuracies of 90% (nine out of ten) for relapsing cases and 100% (26 out of 26) for the remaining cases. Conclusions: We believe that these promising results are an important first step toward the development of automated predictive systems for disease monitoring and continuous response evaluation. Significance: Automated measurement and monitoring of therapeutic response is critical not only for objective evaluation of disease status prognosis but also for timely assessment of treatment strategies.
Auteurs: Bartek Rajwa;Paul K. Wallace;Elizabeth A. Griffiths;Murat Dundar;
Apparue dans: IEEE Transactions on Biomedical Engineering
Date publication: 05.-2017, volume: 64, issue:5, pages: 1089 - 1098
Editeur: IEEE
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» Automated Disease Identification With 3-D Optical Imaging: A Medical Diagnostic Tool
Résumé:
Digital holographic microscopy is an ideal tool for 3-D cell imaging and characterization. It provides a host of cell parameters based on cell morphology and its temporal dynamics or time variation. These parameters can be used to study and quantify cell growth and cell physiology. When coupled with classification algorithms, this technique can also be used to identify and classify cells such as blood cells for automated disease identification. A compact, portable version of this 3-D optical imaging system has the potential to become a device for compact field portable biological data collection, analysis, and cell identification leading to disease diagnosis with mobile devices, low cost instruments for deployment in remote areas with limited access to healthcare to combat disease. In this paper, we present an overview of our reported work on the development of digital holographic microscopes and their applications in 3-D cell imaging, cell parameter extraction and cell classification for potential automated disease identification.
Auteurs: Arun Anand;Inkyu Moon;Bahram Javidi;
Apparue dans: Proceedings of the IEEE
Date publication: 05.-2017, volume: 105, issue:5, pages: 924 - 946
Editeur: IEEE
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» Automatic Detection of 3D Quality Defects in Stereoscopic Videos Using Binocular Disparity
Résumé:
The 3D video quality issues that may disturb the human visual system and negatively impact the 3D viewing experience are well known and become more relevant as the availability of 3D video content increases, primarily through 3D cinema, but also through 3D television. In this paper, we propose four algorithms that exploit available stereo disparity information, in order to detect disturbing stereoscopic effects, namely, stereoscopic window violations, bent window effects, uncomfortable fusion object objects, and depth jump cuts on stereo videos. After detecting such issues, the proposed algorithms characterize them, based on the stress they cause to the viewer’s visual system. Qualitative representative examples, quantitative experimental results on a custom-made video data set, a parameter sensitivity study, and comments on the computational complexity of the algorithms are provided, in order to assess the accuracy and the performance of stereoscopic quality defect detection.
Auteurs: Sotirios Delis;Ioannis Mademlis;Nikos Nikolaidis;Ioannis Pitas;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 977 - 991
Editeur: IEEE
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» Automatic Detection of Ship Targets Based on Wavelet Transform for HF Surface Wavelet Radar
Résumé:
High-frequency surface wave radar (HFSWR) has a vital civilian and military significance for continuous maritime surveillance of activities within exclusive economic zone. However, HFSWR has lower spatial and temporal resolutions and the received signals are strongly polluted by different clutter and background noise. Therefore, ship target detection by HFSWR has become a challenging task. This letter presents an automatic ship target detection algorithm based on discrete wavelet transform (DWT). First, a peak signal-to-noise ratio-based algorithm is proposed to automatically determine the optimal scale of DWT for extraction of ship targets. Second, the high-frequency coefficients of DWT at the optimal scale are processed by a fuzzy set-based method to enhance the useful target information and depress the unwanted background noises. Third, a target-highlighted image is reconstructed by ignoring all the low-frequency coefficients and performing inverse DWT only to the enhanced high-frequency coefficients. Finally, the targets are extracted by adaptive threshold segmentation of the final target-highlighted image. Experimental results show that the proposed approach can automatically extract ship targets effectively for range Doppler images with complex background, and has a better target detection performance than the previous wavelet-based algorithm, thereby providing a new reliable image processing-based method of ship target detection for HFSWR.
Auteurs: Qingzhong Li;Wandong Zhang;Ming Li;Jiong Niu;Q. M. Jonathan Wu;
Apparue dans: IEEE Geoscience and Remote Sensing Letters
Date publication: 05.-2017, volume: 14, issue:5, pages: 714 - 718
Editeur: IEEE
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» Automatic Reference Image Selection for Color Balancing in Remote Sensing Imagery Mosaic
Résumé:
Selection of a reference image is an important step in color balancing. However, the past research and currently available methods do not focus on it, leading to the lack of an effective way to select the reference image for color balancing in remote sensing imagery mosaic. This letter proposes a novel automatic reference image selection method that aims to select the reference images by assessing multifactors according to the land surface types of the target images. The proposed method addresses the limitations caused by the use of a single assessment factor as well as the selection of a single image as the reference in traditional methods. In addition, the proposed method has a wider range of applications than those requiring no reference image. The visual experimental results indicate that the proposed method can select the suitable reference images, which benefits the color balancing result, and outperforms the other comparative methods. Moreover, the absolute mean value of skewness metric of the proposed method is 0.0831, which is lower than the values of the other comparison methods. It indicates that the result of the proposed method had the best performance in the color information. The quantitative analyses with the metric of absolute difference of mean value indicate that the proposed method has a good ability in maintaining the spectral information, and the spectral changing rates had been reduced at least 10.66% by the proposed method when compared with the other methods.
Auteurs: Lei Yu;Yongjun Zhang;Mingwei Sun;Yihui Lu;
Apparue dans: IEEE Geoscience and Remote Sensing Letters
Date publication: 05.-2017, volume: 14, issue:5, pages: 729 - 733
Editeur: IEEE
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» Autonomous System for Interpretation of Measurements Based on Adaptive Device
Résumé:
The monitoring and interpretation of electrical signals have been evolving nowadays. In this paper, an autonomous system based on the concepts of adaptivity has been developed with the goal to perform signal interpretation. The method consists in to receive signals acquired in the field through the sensors installed. From the processing carried out by the knowledge base deployed, the method is able to detect anomalies in the measured point and emits alarms or even actions to be accomplished by the engineer team. The experimental results validate the application of the adaptive method for monitoring and interpretation of signals.
Auteurs: Sidnei Nicoli;Jose Antonio Jardini;Romulo Goncalves Lins;
Apparue dans: IEEE Latin America Transactions
Date publication: 05.-2017, volume: 15, issue:5, pages: 861 - 868
Editeur: IEEE
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» AZO Thin Film Transistor Performance Enhancement by Capping an Aluminum Layer
Résumé:
Coplanar bottom-gate aluminum-zinc-oxide (AZO) thin film transistors (TFTs) with aluminum (Al) capping layers were fabricated in this work. The influences of the Al capping layer thickness and the post-annealing condition on the performance of the AZO-TFTswere investigated. Results show that the performance of the AZO-TFTs are enhanced significantly by introducing the Al capping layer on back channel, with saturation mobility increasing dramatically from 0.128 to 12.6 cm2/ $text {V}cdot text {s}$ . The enhancement is ascribed to the diffusion of Al atoms into the AZO thin film and thus induced crystallization improvement.
Auteurs: Wen Yu;Dedong Han;Junchen Dong;Yingying Cong;Guodong Cui;Yi Wang;Shengdong Zhang;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 2228 - 2232
Editeur: IEEE
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» Bag-of-Discriminative-Words (BoDW) Representation via Topic Modeling
Résumé:
Many of the words in a given document either deliver facts (objective) or express opinions (subjective), respectively, depending on the topics they are involved in. For example, given a bunch of documents, the word “bug” assigned to the topic “order Hemiptera” apparently remarks one object (i.e., one kind of insects), while the same word assigned to the topic “software” probably conveys a negative opinion. Motivated by the intuitive assumption that different words have varying degrees of discriminative power in delivering the objective sense or the subjective sense with respect to their assigned topics, a model named as discriminatively objective-subjective LDA (dosLDA) is proposed in this paper. The essential idea underlying the proposed dosLDA is that a pair of objective and subjective selection variables are explicitly employed to encode the interplay between topics and discriminative power for the words in documents in a supervised manner. As a result, each document is appropriately represented as “bag-of-discriminativewords” (BoDW). The experiments reported on documents and images demonstrate that dosLDA not only performs competitively over traditional approaches in terms of topic modeling and document classification, but also has the ability to discern the discriminative power of each word in terms of its objective or subjective sense with respect to its assigned topic.
Auteurs: Yueting Zhuang;Hanqi Wang;Jun Xiao;Fei Wu;Yi Yang;Weiming Lu;Zhongfei Zhang;
Apparue dans: IEEE Transactions on Knowledge and Data Engineering
Date publication: 05.-2017, volume: 29, issue:5, pages: 977 - 990
Editeur: IEEE
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» Baltic Sea Ice Concentration Estimation Using SENTINEL-1 SAR and AMSR2 Microwave Radiometer Data
Résumé:
Sea ice concentration (SIC) is an important sea ice parameter for sea ice navigation, environmental research, and weather and ice forecasting. We have developed and tested a method for estimation of the Baltic Sea SIC using SENTINEL-1 synthetic aperture radar (SAR) and Advanced Microwave Scanning Radiometer 2 passive microwave radiometer (MWR) data. Here, we present the method and results for January 2016. Ice concentration grids of Finnish Meteorological Institute daily ice charts have been used as reference data in this paper. We present a comparison of four SIC estimation methods with our reference data. In addition to the combined SAR/MWR SIC estimation method, we also compare SIC estimates produced using SAR alone and two MWR-based methods. The main target of this paper was to develop and test a high-resolution SIC estimation method suitable for operational use.
Auteurs: Juha Karvonen;
Apparue dans: IEEE Transactions on Geoscience and Remote Sensing
Date publication: 05.-2017, volume: 55, issue:5, pages: 2871 - 2883
Editeur: IEEE
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» Band Assignment Approaches for Hyperspectral Sharpening
Résumé:
Classical pansharpening algorithms constitute a class of image fusion methods that have been widely investigated in the literature. They have been developed for combining a single- and a multichannel image (panchromatic (PAN) and multispectral (MS), respectively), but can be adapted to the sharpening of hyperspectral (HS) data, both through companion PAN and MS images. We focus in this letter on the HS/MS fusion, showing that the assignation of the MS channel to each HS band is a key step, and investigate several alternatives to make this choice. The assignment algorithms are tested in conjunction with both component substitution and multiresolution analysis pansharpening methods and assessed on images acquired by the Hyperion and ALI sensors. The numerical evaluation shows that the best results can be obtained by optimizing the spectral angle mapper metric confirming that classical methods represent a reliable basis for the development of novel sharpening algorithms.
Auteurs: Daniele Picone;Rocco Restaino;Gemine Vivone;Paolo Addesso;Mauro Dalla Mura;Jocelyn Chanussot;
Apparue dans: IEEE Geoscience and Remote Sensing Letters
Date publication: 05.-2017, volume: 14, issue:5, pages: 739 - 743
Editeur: IEEE
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» Bathymetry Determination From Marine Radar Image Sequences Using the Hilbert Transform
Résumé:
This letter presents an image processing technique based on the theory of the Hilbert transform to determine the coastal bathymetry from marine radar image sequences. Use of the Hilbert transform enables the difficulties and complications of inhomogeneous image analysis to be avoided. In addition, a number of steps and complex computations can be avoided using the numerical algorithm of the Hilbert transform. Because the Hilbert transform is suitable for only monocomponent signals, we first applied the image procedure to decompose the irregular wave patterns into different single wave period images. Analysis of the simulated wave field and radar image sequences demonstrated that there was a high correlation between the estimated depths and reference depths. The causes for errors in the bathymetry estimations are also discussed.
Auteurs: Li-Chung Wu;Dong-Jiing Doong;Jong-Hao Wang;
Apparue dans: IEEE Geoscience and Remote Sensing Letters
Date publication: 05.-2017, volume: 14, issue:5, pages: 644 - 648
Editeur: IEEE
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» Bayesian Time-of-Flight for Realtime Shape, Illumination and Albedo
Résumé:
We propose a computational model for shape, illumination and albedo inference in a pulsed time-of-flight (TOF) camera. In contrast to TOF cameras based on phase modulation, our camera enables general exposure profiles. This results in added flexibility and requires novel computational approaches. To address this challenge we propose a generative probabilistic model that accurately relates latent imaging conditions to observed camera responses. While principled, realtime inference in the model turns out to be infeasible, and we propose to employ efficient non-parametric regression trees to approximate the model outputs. As a result we are able to provide, for each pixel, at video frame rate, estimates and uncertainty for depth, effective albedo, and ambient light intensity. These results we present are state-of-the-art in depth imaging. The flexibility of our approach allows us to easily enrich our generative model. We demonstrate this by extending the original single-path model to a two-path model, capable of describing some multipath effects. The new model is seamlessly integrated in the system at no additional computational cost. Our work also addresses the important question of optimal exposure design in pulsed TOF systems. Finally, for benchmark purposes and to obtain realistic empirical priors of multipath and insights into this phenomena, we propose a physically accurate simulation of multipath phenomena.
Auteurs: Amit Adam;Christoph Dann;Omer Yair;Shai Mazor;Sebastian Nowozin;
Apparue dans: IEEE Transactions on Pattern Analysis and Machine Intelligence
Date publication: 05.-2017, volume: 39, issue:5, pages: 851 - 864
Editeur: IEEE
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» Beehive: Erasure Codes for Fixing Multiple Failures in Distributed Storage Systems
Résumé:
In distributed storage systems, erasure codes have been increasingly deployed to tolerate server failures without loss of data. Traditional erasure codes, such as Reed-Solomon codes, suffer from a high volume of network transfer and disk I/O to recover unavailable data at failed storage servers. Typically, unavailable data at different failed storage servers in a distributed storage system are fixed separately. It has been shown that it is possible to reduce the volume of network transfer significantly by reconstructing data from multiple storage servers at the same time. However, there has been no construction of erasure codes to achieve it without imposing strict constraints on system parameters. In this paper, we propose Beehive codes, designed for optimizing the volume of network transfers to fix the data on multiple failed storage servers. Beehive codes can be constructed over a wide range of system parameters at code rate no more than 0.5, while incurring slightly more storage overhead than Reed-Solomon codes. To achieve the optimal storage overhead as Reed-Solomon codes, we further extend vanilla Beehive codes to MDS Beehive codes, which incurs near-optimal volumes of network transfers during reconstruction. We implement both Beehive and MDS Beehive Codes in C++ and evaluate their performance on Amazon EC2. Our evaluation results have clearly shown that the volume of both network transfers and disk I/O can be conserved by a substantial margin.
Auteurs: Jun Li;Baochun Li;
Apparue dans: IEEE Transactions on Parallel and Distributed Systems
Date publication: 05.-2017, volume: 28, issue:5, pages: 1257 - 1270
Editeur: IEEE
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» Being a Supercook: Joint Food Attributes and Multimodal Content Modeling for Recipe Retrieval and Exploration
Résumé:
This paper considers the problem of recipe-oriented image-ingredient correlation learning with multi-attributes for recipe retrieval and exploration. Existing methods mainly focus on food visual information for recognition while we model visual information, textual content (e.g., ingredients), and attributes (e.g., cuisine and course) together to solve extended recipe-oriented problems, such as multimodal cuisine classification and attribute-enhanced food image retrieval. As a solution, we propose a multimodal multitask deep belief network ( $mathrm{M}^{3}$TDBN) to learn joint image-ingredient representation regularized by different attributes. By grouping ingredients into visible ingredients (which are visible in the food image, e.g., “chicken” and “mushroom”) and nonvisible ingredients (e.g., “salt” and “oil”), $mathrm{M}^{3}$ TDBN is capable of learning both midlevel visual representation between images and visible ingredients and nonvisual representation. Furthermore, in order to utilize different attributes to improve the intermodality correlation, $mathrm{M}^{3}$TDBN incorporates multitask learning to make different attributes collaborate each other. Based on the proposed $mathrm{M}^{3}$TDBN, we exploit the derived deep features and the discovered correlations for three extended novel applications: 1) multimodal cuisine classification; 2) attribute-augmented cross-modal recipe image retrieval; and 3) ingredient and attribute inference from food images. The proposed approach is evaluated on the construct- d Yummly dataset and the evaluation results have validated the effectiveness of the proposed approach.
Auteurs: Weiqing Min;Shuqiang Jiang;Jitao Sang;Huayang Wang;Xinda Liu;Luis Herranz;
Apparue dans: IEEE Transactions on Multimedia
Date publication: 05.-2017, volume: 19, issue:5, pages: 1100 - 1113
Editeur: IEEE
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» Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique
Résumé:
In this paper, a systematic method to design a quasi-optimum lens profile based on quasi-conformal transformation optics technique for a given excitation is presented. This method is applied to a number of conventional antennas, such as an aperture and a log-spiral slot. In all these configurations, an increase of the directivity is observed. Furthermore, using this method, a quasi-optimum graded index lens for a broadband enhanced leaky slot excitation is designed and the results are compared with a hyperhemispherical lens with and without matching layers. Our proposed methodology demonstrates to be able to increase the directivity, to reduce the sidelobes and the cross polarization in a broad bandwidth from 20 to 70 GHz. Due to the continuously changed dielectric constant of the lens profile, reflections are also reduced considerably inside the lens.
Auteurs: Mahsa Ebrahimpouri;Oscar Quevedo-Teruel;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2256 - 2264
Editeur: IEEE
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» Better Now Than Later: Managing Technical Debt in Systems Development
Résumé:
Technical debt is incurred when development project tasks are deferred either unintentionally or deliberately. Detecting and mitigating this debt, including controlling it through risk management techniques, can help avoid or address common project pitfalls, such as late delivery, team burnout, and cost overruns.
Auteurs: Richard E. Fairley;Mary Jane Willshire;
Apparue dans: Computer
Date publication: 05.-2017, volume: 50, issue:5, pages: 80 - 87
Editeur: IEEE
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» Blind Estimation of the HPA Operating Point in Multicarrier Satellite Transponders
Résumé:
Satellite operators need to know the operating point of a transponder to provide a good transmission quality. Especially in satellite networks with many small carriers in one transponder, the estimation is challenging because of gain compression, capture effects or unknown attenuation in the transmission channel. We propose a blind estimator based on signal statistics to overcome these problems. The new estimator is independent of a-priori information about the carrier modulation and the absolute power of the received signal. The method is applicable to existing satellites because we only use a simulation model of the transponder together with the sampled receive signal for the estimation process.
Auteurs: Matthias G. Schraml;Andreas Knopp;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1051 - 1054
Editeur: IEEE
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» Blind Interference Alignment for Multiuser MISO Indoor Visible Light Communications
Résumé:
A filter-pair-based blind interference alignment scheme is proposed to improve the achievable degree of freedom (DoF) in multiuser multiple-input single-output indoor visible light communications. In the proposed scheme, the transmitter does not need to know channel state information. Different transmit sub-channels employ different pulse-shaping filters, and each user is equipped with multiple receive filters. The transmitter sends signals according to the predesigned strategy, and each user sets the receive mode by choosing the corresponding receive filter. Optical orthogonal frequency division multiplexing is employed in the proposed scheme to combat the intersymbol interference in high-speed transmissions, and the maximum achievable spectrum efficiency (SE) of the proposed scheme is analyzed. Simulation results validate that the proposed scheme can achieve higher SE and more DoF than the orthogonal multiple access schemes.
Auteurs: Liang Wu;Zaichen Zhang;Jian Dang;Huaping Liu;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1039 - 1042
Editeur: IEEE
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» Blind Sharpness Prediction for Ultrahigh-Definition Video Based on Human Visual Resolution
Résumé:
We explore a no-reference sharpness assessment model for predicting the perceptual sharpness of ultrahigh-definition (UHD) videos through analysis of visual resolution variation in terms of viewing geometry and scene characteristics. The quality and sharpness of UHD videos are influenced by viewer perception of the spatial resolution afforded by the UHD display, which depends on viewing geometry parameters including display resolution, display size, and viewing distance. In addition, viewers may perceive different degrees of quality and sharpness according to the statistical behavior of the visual signals, such as the motion, texture, and edge, which vary over both spatial and temporal domains. The model also accounts for the resolution variation associated with fixation and foveal regions, which is another important factor affecting the sharpness prediction of UHD video over the spatial domain and which is caused by the nonuniform distribution of the photoreceptors. We calculate the transition of the visually salient statistical characteristics resulting from changing the display’s screen size and resolution. Moreover, we calculated the temporal variation in sharpness over consecutive frames in order to evaluate the temporal sharpness perception of UHD video. We verify that the proposed model outperforms other sharpness models in both spatial and temporal sharpness assessments.
Auteurs: Haksub Kim;Jongyoo Kim;Taegeun Oh;Sanghoon Lee;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 951 - 964
Editeur: IEEE
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» Block-Matching Distortion Correction of Echo-Planar Images With Opposite Phase Encoding Directions
Résumé:
By shortening the acquisition time of MRI, Echo Planar Imaging (EPI) enables the acquisition of a large number of images in a short time, compatible with clinical constraints as required for diffusion or functional MRI. However such images are subject to large, local distortions disrupting their correspondence with the underlying anatomy. The correction of those distortions is an open problem, especially in regions where large deformations occur. We propose a new block-matching registration method to perform EPI distortion correction based on the acquisition of two EPI with opposite phase encoding directions (PED). It relies on new transformations between blocks adapted to the EPI distortion model, and on an adapted optimization scheme to ensure an opposite symmetric transformation. We present qualitative and quantitative results of the block-matching correction using different metrics on a phantom dataset and on in-vivo data. We show the ability of the block-matching to robustly correct EPI distortion even in strongly affected areas.
Auteurs: Renaud Hédouin;Olivier Commowick;Elise Bannier;Benoit Scherrer;Maxime Taquet;Simon K. Warfield;Christian Barillot;
Apparue dans: IEEE Transactions on Medical Imaging
Date publication: 05.-2017, volume: 36, issue:5, pages: 1106 - 1115
Editeur: IEEE
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» BlockPy: An Open Access Data-Science Environment for Introductory Programmers
Résumé:
Non-computer science majors often struggle to find relevance in traditional computing curricula that tend to emphasize abstract concepts, focus on nonpractical entertainment, or rely on decontextualized settings. BlockPy, a web-based, open access Python programming environment, supports introductory programmers in a data-science context through a dual block/text programming view. The web extra at https://youtu.be/RzaOPqOpMoM illustrates BlockPy features discussed in the article.
Auteurs: Austin Cory Bart;Javier Tibau;Eli Tilevich;Clifford A. Shaffer;Dennis Kafura;
Apparue dans: Computer
Date publication: 05.-2017, volume: 50, issue:5, pages: 18 - 26
Editeur: IEEE
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» Book Reviews [7 Books Reviewed]
Résumé:
Books reviewed are: Photovoltaic Laboratory-Safety, Code-Compliance,and Commercial Off-the-Shelf Equipment, by P. T. Parrish, CRC Press Taylor & Francis Group; Dielectrics in Electric Fields,2nd Edition by, G. G. Raju CRC Press Taylor & Francis Group; Advanced Piezoelectric Materials-Science and Technology by K. Uchino, editor Woodhead Publishing; Introduction to Modern Power Electronics, 3rd Edition, by A. M. Trzynadlowski John Wiley & Sons Inc.; Engineering Electrodynamics, by J. Turowski and M. Turowski CRC Press Taylor & Francis Group; Discharge in Long Air Gaps-Modeling and Applications, by A. Beroual and I. Fofana IOP Publishing; Impedance Source Power Electronic Converters by Y. Liu, H. Abu-Rub, F. Blaabjerg, O.Ellabban, and P. C. Loh, John Wiley & Sons Inc.
Auteurs: John J. Shea;
Apparue dans: IEEE Electrical Insulation Magazine
Date publication: 05.-2017, volume: 33, issue:3, pages: 42 - 47
Editeur: IEEE
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» Brevity, Clarity, Engagement: The IMS2017 Three Minute Thesis Competition
Résumé:
Presents information on the IMS 2017 Conference.
Auteurs: John W. Bandler;Erin M. Kiley;
Apparue dans: IEEE Microwave Magazine
Date publication: 05.-2017, volume: 18, issue:3, pages: 85 - 87
Editeur: IEEE
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» Broadband Analog Network Coding With Robust Processing for Two-Way Relay Networks
Résumé:
In this letter, we study the robust processing for a single carrier two-way relay network with broadband analog network coding and imperfect channel state information. Based on a statistical model for channel estimation error, we derive the optimal coefficients of self interference cancellation and linear frequency domain equalization in the sense of minimizing the conditional mean square error given a channel estimate. Simulation results show that the proposed robust design can achieve better bit error rate performance than the conventional non-robust scheme.
Auteurs: Jiejun Qin;Yu Zhu;Pengfei Zhe;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1115 - 1118
Editeur: IEEE
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» Broadband and Wavelength-Dependent Chalcogenide Optical Fiber Couplers
Résumé:
We present optical fiber couplers made of As2Se3 glass. Broadband and wavelength-dependent couplers are fabricated from fibers of engineered core/cladding diameter ratios. Coupling ratios at the through-cross ports ranging from 50%–50% down to 1%–99% are achieved. The transparency of As2Se3 glass over the spectral range of 1.5–12.0 $mu text{m}$ makes it a material of prime interest for the fabrication of mid-infrared couplers.
Auteurs: Farzan Tavakoli;Alexandre Rekik;Martin Rochette;
Apparue dans: IEEE Photonics Technology Letters
Date publication: 05.-2017, volume: 29, issue:9, pages: 735 - 738
Editeur: IEEE
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» Broadband CMOS Schottky-Diode Star Mixer Using Coupled-CPW Marchand Dual-Baluns
Résumé:
A broadband CMOS Marchand dual-balun using stacked broadside couplers for low odd-mode impedance with surrounded ground planes for high even-mode impedance is employed to achieve a high coupling coefficient needed for a Marchand dual-balun. The demonstrated Marchand dual-balun using 0.18- $mu text{m}$ CMOS technology is designed at 30-GHz center frequency with an insertion loss of 11.5- and 10-dB input return loss bandwidth of over 120%. The bandwidth of 1-dB amplitude imbalance and 10° phase difference are over 100%. A broadband CMOS Schottky-diode star mixer is implemented with two Marchand dual-baluns at RF and local oscillator (LO) ports. As a result, the Schottky-diode star mixer shows conversion loss of 14 dB, LO-to-RF isolation of 26 dB, LO-to-IF isolation of 45 dB, and RF-to-IF isolation of 42 dB within 27-GHz operating bandwidth, respectively.
Auteurs: Yu-Chih Hsiao;Chinchun Meng;Yong-Hao Peng;
Apparue dans: IEEE Microwave and Wireless Components Letters
Date publication: 05.-2017, volume: 27, issue:5, pages: 500 - 502
Editeur: IEEE
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» Broadband Dual-Port Intermodulation Generator for Passive Intermodulation Measurements
Résumé:
A dual-port tunable intermodulation (IM) generator is reported. This IM generator employs a coupling network to distribute carrier waves and IM. The proposed coupling network is constructed by cascading four parallel-coupled directional couplers, while a Schottky diode is working as a tunable IM source. By adjusting the IM performance of diode using bias voltage and distributing IM along symmetrical IM paths, a pair of tunable IM signals is introduced into passive IM (PIM) test loop simultaneously, they can serve as bidirectional IM reference in dual-port PIM measurements. The provided IM3 can be tuned to be lower than −112 dBm at $2 times 43$ dBm at either 710 or 2550 MHz, while their dynamic IM3 range can reach about 20 dB at $2 times 43$ dBm. The work promotes the application of IM predistortion techniques and provides a solution to realize dual-port dynamic IM calibration in PIM test.
Auteurs: Xiong Chen;Yongning He;Wanzhao Cui;
Apparue dans: IEEE Microwave and Wireless Components Letters
Date publication: 05.-2017, volume: 27, issue:5, pages: 518 - 520
Editeur: IEEE
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» Broadband Microwave Signal Processing Based on Photonic Dispersive Delay Lines
Résumé:
The development of communications technologies has led to an ever-increasing demand for a higher speed and wider bandwidth of microwave signal processors. To overcome the inherent electronic speed limitations, photonic techniques have been developed for processing of ultrabroadband microwave signals. A dispersive delay line (DDL) is a key photonic device that can be used to implement signal processing functions, such as time reversal, time delay, dispersion compensation, Fourier transformation, and pulse compression. Compared with an electrical delay line, a photonic DDL has a much wider bandwidth and can be used for processing a microwave signal with a much wider bandwidth. In this paper, we review our recent work using photonic DDLs for processing of broadband microwave signals. Two types of DDLs are to be discussed, a linearly chirped fiber Bragg grating-based DDL and an optical dispersive loop-based DDL. Signal processing functions including microwave time reversal, microwave temporal convolution, time-stretched sampling, microwave waveform generation with an extended temporal duration, and wideband true-time delay beamforming are discussed.
Auteurs: Jiejun Zhang;Jianping Yao;
Apparue dans: IEEE Transactions on Microwave Theory and Techniques
Date publication: 05.-2017, volume: 65, issue:5, pages: 1891 - 1903
Editeur: IEEE
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» Broadcast Erasure Channel With Feedback and Message Side Information, and Related Index Coding Result
Résumé:
We consider the $N$ -receiver broadcast erasure channel with feedback and message side information at the receivers prior to beginning of transmission. Specifically, the transmitter must deliver different, independent messages to each of the receivers, and each receiver knows a function of these messages before transmission begins. This situation can arise in multi-hop wireless networks, where a receiver may overhear transmissions consisting of possibly encoded combinations of messages (e.g., encoded using a network coding technique) prior to beginning of transmission over a given broadcast channel. We provide an outer bound to the capacity region of this system. For the case, where each message consists of a number of symbols taking values in a finite field and each receiver knows linear combinations of these symbols, the outer bound is given in terms of ranks of matrices expressing the linear combinations. For the latter case and when $N=2$ , the outer bound is tight under mild conditions on the limiting behavior of the ranks of matrices expressing the side information. We provide a capacity achieving code for this case. The special case, where each receiver either knows the entire message of another receiver or has no information about it, constitutes a generalization of the index coding problem that incorporates channel erasures. For this instance, and when there are no channel errors, we show that the outer bound reduces to the known maximum weighted acyclic induced subgraph bound.
Auteurs: Athanasios Papadopoulos;Leonidas Georgiadis;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3161 - 3180
Editeur: IEEE
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» Buckle Up: The Smart Grid Rollout Begins [In My View]
Résumé:
A valuable set of matured smart grid concepts has emerged from the significant trial-and-demonstration programs around the world. An investment in rollout programs is now required to deliver the full value of these initial investments to electricity customers. Managing the risks and making an effective transition to the smarter grid are significant challenges but a growing body of experience, strong principles, and effective solutions to the issues are helping to make smart grids business as usual. Innovative grid solutions trials create real operating environments for assessing the technical and commercial performance of solutions to industry problems. They also enhance basic technological understanding, leading to improved design and production quality of rollout-ready solutions.
Auteurs: Graham Ault;
Apparue dans: IEEE Power and Energy Magazine
Date publication: 05.-2017, volume: 15, issue:3, pages: 104 - 100
Editeur: IEEE
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» Build your own Amazon Echo - Turn a PI into a voice controlled gadget [Resources_Hands on]
Résumé:
As a young man, I yearned for a machine like the ship's computer on Star Trek: a gadget that can listen and obey a human voice, and answer in kind. Fifteen years ago, after reading about university researchers who had gotten voice-controlled artificial intelligence systems working, I taught myself Linux and set up a server in my attic in the hope that the technology had arrived to let me build such a thing myself. It had not.
Auteurs: W. Wayt Gibbs;
Apparue dans: IEEE Spectrum
Date publication: 05.-2017, volume: 54, issue:5, pages: 20 - 21
Editeur: IEEE
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» Burst-Erasure Correcting Codes With Optimal Average Delay
Résumé:
The objective of low-delay codes is to protect communication streams from erasure bursts by minimizing the time between the packet erasure and its reconstruction. Previous work has concentrated on the constant-delay scenario, where all erased packets need to exhibit the same decoding delay. We consider the case of heterogeneous delay, where the objective is to minimize the average delay across the erased packets in a burst. We derive delay lower bounds for the average case, and show that they match the constant-delay bounds only at a single rate point $R=0.5$ . We then construct codes with optimal average delays for the entire range of code rates. The construction for rates $Rleq 0.5$ achieves optimality for every erasure instance, while the construction for rates $R>0.5$ is optimal for a $(1-R)/R$ fraction of all burst instances and close to optimal for the remaining fraction. The paper also studies the benefits of delay heterogeneity within the application of sensor communications. It is shown that a carefully designed code can significantly improve the temporal precision at the receiving node following erasure-burst events.
Auteurs: Nitzan Adler;Yuval Cassuto;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 2848 - 2865
Editeur: IEEE
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» C-Vine Copula Mixture Model for Clustering of Residential Electrical Load Pattern Data
Résumé:
The ongoing deployment of residential smart meters in numerous jurisdictions has led to an influx of electricity consumption data. This information presents a valuable opportunity to suppliers for better understanding their customer base and designing more effective tariff structures. In the past, various clustering methods have been proposed for meaningful customer partitioning. This paper presents a novel finite mixture modeling framework based on C-vine copulas (CVMM) for carrying out consumer categorization. The superiority of the proposed framework lies in the great flexibility of pair copulas toward identifying multidimensional dependency structures present in load profiling data. CVMM is compared to other classical methods by using real demand measurements recorded across 2613 households in a London smart-metering trial. The superior performance of the proposed approach is demonstrated by analyzing four validity indicators. In addition, a decision tree classification module for partitioning new consumers is developed and the improved predictive performance of CVMM compared to existing methods is highlighted. Further case studies are carried out based on different loading conditions and different sets of large numbers of households to demonstrate the advantages and to test the scalability of the proposed method.
Auteurs: Mingyang Sun;Ioannis Konstantelos;Goran Strbac;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 2382 - 2393
Editeur: IEEE
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» Camera Self-Calibration Based on Nonlinear Optimization and Applications in Surveillance Systems
Résumé:
This paper presents a new approach for self-calibration of static cameras in the context of surveillance applications. Initially, a pedestrian detector is applied and the responses are validated using background removal. Then, foreground-related pixels within the detection results are used to estimate the feet-head line segments of each person (called poles), which are used to find a linear estimate for the camera matrix. Finally, a nonlinear cost function is used to refine the initial estimate, aiming to mostly improve the orientation of the reprojected poles. We also present different applications of self-calibration in tasks related to video surveillance itself, such as improvements to pedestrian detection and tracking algorithms, and augmented reality applications, such as the insertion of virtual cameras to aid the placement of real cameras in the scene.
Auteurs: Gustavo Führ;Cláudio Rosito Jung;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 1132 - 1142
Editeur: IEEE
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» Can Affective Computing Save Lives? Meet Mobile Health
Résumé:
This installment of Computer's series highlighting the work published in IEEE Computer Society journals comes from IEEE Transactions on Affective Computing.
Auteurs: Björn Schuller;
Apparue dans: Computer
Date publication: 05.-2017, volume: 50, issue:5, pages: 13 - 13
Editeur: IEEE
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» Capacity Analysis of FBMC-OQAM Systems
Résumé:
This letter presents a capacity analysis of filter bank multicarrier offset quadrature amplitude modulation (FBMC-OQAM) systems. In FBMC-OQAM receivers, it is common to preserve the real part of the demodulated signal samples for information recovery. The imaginary part of these samples, which are called intrinsic interference, is simply ignored. This letter provides a theoretical answer to the following fundamental question. Does the ignored imaginary interference in FBMC-OQAM contain any information beyond what could be obtained from the preserved real parts?
Auteurs: Ahmad RezazadehReyhani;Behrouz Farhang-Boroujeny;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 999 - 1002
Editeur: IEEE
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» Capacity Bounds for the Gaussian IM-DD Optical Multiple-Access Channel
Résumé:
Optical wireless communications (OWC) is a promising technology for closing the mismatch between the growing number of connected devices and the limited wireless network capabilities. Similar to downlink, uplink can also benefit from OWC for establishing connectivity between such devices and an optical access point. In this context, the incoherent intensity-modulation and direct-detection (IM-DD) scheme is desirable in practice. Hence, it is important to understand the fundamental limits of communication rates over an OWC uplink employing IM-DD, i.e., the channel capacity. This uplink, modeled as a Gaussian multiple-access channel (MAC) for indoors OWC, is studied in this paper, under the IM-DD constraints, which form the main difference with the standard Gaussian MAC commonly studied in the radio-frequency context. Capacity region outer and inner bounds for this channel are derived. The bounds are fairly close at high signal-to-noise ratio (SNR), where a truncated-Gaussian input distribution achieves the capacity region within a constant gap. Furthermore, the bounds coincide at low SNR showing the optimality of ON–OFF keying combined with successive cancellation decoding in this regime. At moderate SNR, an optimized uniformly spaced discrete input distribution achieves fairly good performance.
Auteurs: Anas Chaaban;Omer Mahmoud S. Al-Ebraheemy;Tareq Y. Al-Naffouri;Mohamed-Slim Alouini;
Apparue dans: IEEE Transactions on Wireless Communications
Date publication: 05.-2017, volume: 16, issue:5, pages: 3328 - 3340
Editeur: IEEE
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» Carbon Nanotube Interconnects for Nanoelectronic Integrated Systems
Résumé:
A perspective study about the effect of carbon nanotube compared with copper interconnects in the H-tree distributed clock network - used for routing clock signals inside a chip - in nanoelectronic systems will be developed based on simulation models. Important features for circuit design, such as low logic level, high logic level, rise time, slew rate, attenuation, delay time, dissipated power and delay-power product will be evaluated by computer simulations. Results will show that distributed networks based on carbon nanotube interconnects are able to operate at terahertz frequencies.
Auteurs: Camila Peixoto da Silva Madeira Nogueira;Janaina Goncalves Guimaraes;
Apparue dans: IEEE Latin America Transactions
Date publication: 05.-2017, volume: 15, issue:5, pages: 813 - 818
Editeur: IEEE
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» Cardiac Image Reconstruction via Nonlinear Motion Correction Based on Partial Angle Reconstructed Images
Résumé:
Even though the X-ray Computed Tomography (CT) scan is considered suitable for fast imaging, motion-artifact-free cardiac imaging is still an important issue, because the gantry rotation speed is not fast enough compared with the heart motion. To obtain a heart image with less motion artifacts, a motion estimation (ME) and motion compensation (MC) approach is usually adopted. In this paper, we propose an ME/MC algorithm that can estimate a nonlinear heart motion model from a sinogram with a rotation angle of less than 360°. In this algorithm, we first assume the heart motion to be nonrigid but linear, and thereby estimate an initial 4-D motion vector field (MVF) during a half rotation by using conjugate partial angle reconstructed images, as in our previous ME/MC algorithm. We then refine the MVF to determine a more accurate nonlinear MVF by maximizing the information potential of a motion-compensated image. Finally, MC is performed by incorporating the determined MVF into the image reconstruction process, and a time-resolved heart image is obtained. By using a numerical phantom, a physical cardiac phantom, and an animal data set, we demonstrate that the proposed algorithm can noticeably improve the image quality by reducing motion artifacts throughout the image.
Auteurs: Seungeon Kim;Yongjin Chang;Jong Beom Ra;
Apparue dans: IEEE Transactions on Medical Imaging
Date publication: 05.-2017, volume: 36, issue:5, pages: 1151 - 1161
Editeur: IEEE
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» Catch the Wave! [From the Guest Editors' Desk]
Résumé:
Auteurs: Aditya Singh;Isar Mostafanezhad;
Apparue dans: IEEE Microwave Magazine
Date publication: 05.-2017, volume: 18, issue:3, pages: 12 - 14
Editeur: IEEE
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» Causal Boxes: Quantum Information-Processing Systems Closed Under Composition
Résumé:
Complex information-processing systems, for example, quantum circuits, cryptographic protocols, or multi-player games, are naturally described as networks composed of more basic information-processing systems. A modular analysis of such systems requires a mathematical model of systems that is closed under composition, i.e., a network of these objects is again an object of the same type. We propose such a model and call the corresponding systems causal boxes. Causal boxes capture superpositions of causal structures, e.g., messages sent by a causal box $A$ can be in a superposition of different orders or in a superposition of being sent to box $B$ and box $C$ . Furthermore, causal boxes can model systems whose behavior depends on time. By instantiating the abstract cryptography framework with causal boxes, we obtain the first composable security framework that can handle arbitrary quantum protocols and relativistic protocols.
Auteurs: Christopher Portmann;Christian Matt;Ueli Maurer;Renato Renner;Björn Tackmann;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3277 - 3305
Editeur: IEEE
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» Centralized Collaborative Sparse Unmixing for Hyperspectral Images
Résumé:
Spectral unmixing is very important in hyperspectral image analysis and processing, which aims at identifying the constituent spectra (i.e., endmembers) and estimating their fractional abundances from the mixed pixels. In recent years, sparse unmixing has received considerable interest. However, the acquired hyperspectral images are generally degraded by the noise, making sparse unmixing not faithful enough. To address this issue, this paper proposes a novel framework to couple sparse hyperspectral unmixing and abundance estimation error reduction together. Specifically, with the definition of abundance estimation error, a centralized constraint is incorporated into the collaborative sparse unmixing framework by exploiting the nonlocal redundancy of abundance map. This way we suppress the abundance estimation error, and improve the unmixing accuracy. Meanwhile, the alternating direction method of multipliers is introduced to solve the underlying constrained model. Experimental results on both synthetic and real hyperspectral data demonstrate the effectiveness of our proposed algorithm.
Auteurs: Rui Wang;Heng-Chao Li;Wenzhi Liao;Xin Huang;Wilfried Philips;
Apparue dans: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Date publication: 05.-2017, volume: 10, issue:5, pages: 1949 - 1962
Editeur: IEEE
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» Change Detection Based on Gabor Wavelet Features for Very High Resolution Remote Sensing Images
Résumé:
In this letter, we propose a change detection method based on Gabor wavelet features for very high resolution (VHR) remote sensing images. First, Gabor wavelet features are extracted from two temporal VHR images to obtain spatial and contextual information. Then, the Gabor-wavelet-based difference measure (GWDM) is designed to generate the difference image. In GWDM, a new local similarity measure is defined, in which the Markov random field neighborhood system is incorporated to obtain a local relationship, and the coefficient of variation method is applied to discriminate contributions from different features. Finally, the fuzzy c-means cluster algorithm is employed to obtain the final change map. Experiments employing QuickBird and SPOT5 images demonstrate the effectiveness of the proposed approach.
Auteurs: Zhenxuan Li;Wenzhong Shi;Hua Zhang;Ming Hao;
Apparue dans: IEEE Geoscience and Remote Sensing Letters
Date publication: 05.-2017, volume: 14, issue:5, pages: 783 - 787
Editeur: IEEE
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» Changes to the Editorial Board
Résumé:
It is my pleasure to welcome Dr. Brian S. Doyle to the Editorial Board of the IEEE Electron Device Letters. A biography and sketch of Dr. Doyle’s research interests can be found below. His subject areas are Emerging Technologies and Devices and Embedded Memory Devices and Technology.
Auteurs: Tsu-Jae King Liu;
Apparue dans: IEEE Electron Device Letters
Date publication: 05.-2017, volume: 38, issue:5, pages: 539 - 539
Editeur: IEEE
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» Changing Lives in EPICS Fashion
Résumé:
Founded at Purdue University in 1995, Engineering Projects in Community Service (EPICS) in IEEE empowers teams of university and high school students to collaborate on socially innovative projects that will have a lasting impact on local humanitarian organizations and community members. Not only does this program give students a unique platform to experience a career in the engineering field, which many of them are already pursuing, but it also enables them to develop and broaden their technical skills to address critical community issues while transforming lives.
Auteurs: Lindsey Moses;
Apparue dans: IEEE Potentials
Date publication: 05.-2017, volume: 36, issue:3, pages: 6 - 17
Editeur: IEEE
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» Channel Selection Algorithm for Cognitive Radio Networks with Heavy-Tailed Idle Times
Résumé:
We consider a multichannel Cognitive Radio Network (CRN), where secondary users sequentially sense channels for opportunistic spectrum access. In this scenario, the Channel Selection Algorithm (CSA) allows secondary users to find a vacant channel with the minimal number of channel switches. Most of the existing CSA literature assumes exponential ON-OFF time distribution for primary user's (PU) channel occupancy pattern. This exponential assumption might be helpful to get performance bounds; but not useful to evaluate the performance of CSA under realistic conditions. An in-depth analysis of independent spectrum measurement traces reveals that wireless channels have typically heavy-tailed PU OFF times. In this paper, we propose an extension to the Predictive CSA framework and its generalization for heavy tailed PU OFF time distribution, which represents realistic scenarios. In particular, we calculate the probability of channel being idle for hyper-exponential OFF times to use in CSA. We implement our proposed CSA framework in a wireless test-bed and comprehensively evaluate its performance by recreating the realistic PU channel occupancy patterns. The proposed CSA shows significant reduction in channel switches and energy consumption as compared to Predictive CSA which always assumes exponential PU ON-OFF times. Through our work, we show the impact of the PU channel occupancy pattern on the performance of CSA in multichannel CRN.
Auteurs: Senthilmurugan Sengottuvelan;Junaid Ansari;Petri Mähönen;T.G. Venkatesh;Marina Petrova;
Apparue dans: IEEE Transactions on Mobile Computing
Date publication: 05.-2017, volume: 16, issue:5, pages: 1258 - 1271
Editeur: IEEE
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» Channel-Aware Polling-Based MAC Protocol for Body Area Networks: Design and Analysis
Résumé:
Body area networks (BANs) enable wearable/implanted devices to exchange information or collect monitored data. The channel quality of a link in a BAN is typically highly dynamic, since sensors equipped on a human body usually move with gesture, posture, or mobility. Therefore, existing sleep-wake-up scheduling mechanisms used in traditional static sensor networks could be very inefficient in a BAN, because they do not consider channel fluctuation of body sensors. Sensors might be waked up to transmit during bad channel conditions, leading to transmission failures and energy waste. To remedy this inefficiency, this paper proposes a Channel-aware Polling-based MAC protocol CPMAC. Our design only wakes sensors up and triggers them to transmit when the channel is strong enough to ensure fast and reliable transmissions. We further analyze the energy consumption and derive a queueing model to estimate the probability of completing all data transmissions of all sensors in our CPMAC. Benefiting from these analyses, we are able to optimize energy efficiency of our CPMAC by adapting the number of polling periods in a superframe to dynamic traffic demands and channel fluctuation. Our simulation results show that, as compared with TDMA-based scheduling and the IEEE 802.15.6 CSMA/CA protocol, CPMAC significantly improves energy efficiency and, meanwhile, keeps the latency short.
Auteurs: Chi-Han Lin;Kate Ching-Ju Lin;Wen-Tsuen Chen;
Apparue dans: IEEE Sensors Journal
Date publication: 05.-2017, volume: 17, issue:9, pages: 2936 - 2948
Editeur: IEEE
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» Characteristic Mode Analysis of Plasmonic Nanoantennas
Résumé:
The theory of characteristic modes (TCMs) based on the surface integral equation (SIE) formalism is presented for the analysis of plasmonic nanostructures. With TCM, excitation-independent characteristic solutions of the underlying electromagnetic field problem are obtained. Both single and multiple particle nanostructures are analyzed using the conventional SIE approach and the TCM formalism. By comparing these results, the modes that are responsible of the observed scattering and absorption characteristics can be identified. These solutions can be further utilized in the design and tuning nanoantenna configurations for specific application purposes.
Auteurs: Pasi Ylä-Oijala;Dimitrios C. Tzarouchis;Elias Raninen;Ari Sihvola;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2165 - 2172
Editeur: IEEE
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» Characteristics of Needle-Disk Electrodes Atmospheric Pressure Discharges Applied to Modify PET Wettability
Résumé:
In the atmospheric pressure discharge with arran- gement of a syringe needle, a capillary, and an external disk, it was observed different operation modes according to the relative position of the electrodes. With external electrode over the shaft of the needle, a stable and steady plume is formed from the tip of the needle to the exterior of the capillary. The breakdown is governed by filamentary discharges that evolve randomly on time in the gap between the needle and the capillary. This mechanism changes to bullet-like discharge when the external disk is located off needle. The breakdown generates a large amount of charge that rises quickly and varies with the distance between the electrodes. The mean power is higher than that of the previous case and the plume generated, in interaction with external metallic surface, is more unstable to arc transition. Independently of the operation mode, high electric field at the bevel of the needle plays an important role on the evolution of the plume. The application of the plume to change the wettability properties of the polyethylene terephthalate indicated rapid augment of the hydrophilicy and treated area larger than the plume dimension.
Auteurs: Milton Eiji Kayama;Lucas José da Silva;Vadym Prysiazhnyi;Konstantin G. Kostov;Mauricio Antonio Algatti;
Apparue dans: IEEE Transactions on Plasma Science
Date publication: 05.-2017, volume: 45, issue:5, pages: 843 - 848
Editeur: IEEE
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» Characterization and Optimization of Unrepeatered Coherent Transmission Systems Using DRA and ROPA
Résumé:
We present a detailed investigation of the singe-channel 100G polarization-multiplexed quadrature-phase-shift-keying-based unrepeatered coherent transmissions using various order distributed Raman amplifiers (DRAs). The impact of main factors on the system performance is discussed including intrachannel nonlinearity, amplified spontaneous emission, double Rayleigh backscattering, and pump relative intensity noise (RIN)-induced impairments. After optimizing the pump power configuration, it is found that compared to a first- and a third-order DRA, a second-order DRA can provide the best performance owing to relative high optical signal-to-noise ratio (OSNR) and low pump RIN-induced penalty. By using the Giles model, the optimization of a remote optically pumped amplifier is performed in terms of the Erbium-doped fiber length and its farthest position, with given input signal's power and OSNR.
Auteurs: Jingchi Cheng;Ming Tang;Songnian Fu;Perry Ping Shum;Deming Liu;
Apparue dans: Journal of Lightwave Technology
Date publication: 05.-2017, volume: 35, issue:10, pages: 1830 - 1836
Editeur: IEEE
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» Characterization of Defects in AlGaN/GaN HEMTs Based on Nonlinear Microwave Current Transient Spectroscopy
Résumé:
This paper presents a new nonlinear microwave-based characterization methodology for the study of the deep levels proprieties in gallium nitride (GaN)-based high electron mobility transistors (HEMTs). Currently, it is unique measurement method allowing the extraction of time constants of HEMTs operating under large signal RF conditions. This method improves the conventional dc techniques, since it employs RF excitation during the filling condition to investigate the impact of “real-life” RF excitation on the trapping mechanisms. The experimental results demonstrate that, beyond the presence of Poole–Frenkel effect, the slow detrapping time constant is accelerated by the power dissipation of the trapping bias point. Moreover, it is possible to distinguish the impact of dc and RF conditions on the trapping phenomena. The temperature measurements allow identifying the 0.75-eV deep level, attributed to extended defects in GaN, when ionized under dc excitation. This deep level trap is probably located in the buffer layer and contributes to the RF trapping phenomenon.
Auteurs: Agostino Benvegnù;Sylvain Laurent;Olivier Jardel;Jean-Luc Muraro;Matteo Meneghini;Denis Barataud;Gaudenzio Meneghesso;Enrico Zanoni;Raymond Quéré;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 2135 - 2141
Editeur: IEEE
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» Characterization of Iron Loss for Integral-Slot Interior Permanent Magnet Synchronous Machine During Flux Weakening
Résumé:
Iron loss resistance is widely used for rapid motor design and maximum efficiency control. However, the harmonic loss obviously increases during flux weakening, and even dominates in total iron loss, especially in deep flux weakening region. This paper presents an analytical calculation method of iron loss for an integral-slot interior permanent magnet synchronous machine (IPMSM) by iron loss resistance, considering harmonic effect during flux weakening. To predict the harmonic loss, both a harmonic loss voltage and a harmonic loss coefficient are employed into an iron loss resistance model, and the relation of harmonic loss to the harmonic voltage and coefficient are studied. The iron loss and efficiency of an integral-slot IPMSM are, respectively, obtained by the proposed model, the conventional model, the experiment, and finite-element analysis (FEA). The proposed model is validated by the comparison with FEA and experimental results.
Auteurs: Qi Li;Tao Fan;Xuhui Wen;
Apparue dans: IEEE Transactions on Magnetics
Date publication: 05.-2017, volume: 53, issue:5, pages: 1 - 8
Editeur: IEEE
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» Characterization of the Spatial Variability of In-Situ Soil Moisture Measurements for Upscaling at the Spatial Resolution of RADARSAT-2
Résumé:
This study characterizes the spatial variability of soil moisture measurements using statistical and geostatistical analyses for the transferability of the ground measurements to the scale of the spatial resolution of RADARSAT-2 images. It aims to better interpret synthetic aperture radar backscattering relationships to soil moisture. Coincident with RADARSAT-2 overpasses, soil and crop parameters were measured in July 2008 and August 2009 over two Canadian agricultural sites (Kenaston, Saskatchewan, and Lennoxville, Québec). The measured soil moisture was used to determine the theoretical semivariogram models that fit the experimental semivariograms. An inverse correlation is obtained between the soil moisture coefficient of variation (CV) and the range (spatial correlation) of the semivariogram, which can assess the degree of the spatial correlation between the samples of each field. Soil moisture measurements with high values of CV (20%–40%) are correlated within a distance less than 10 m and those with lower CV (10%–20%) are correlated within a larger distance varying between 12 and 46 m. The soil moisture measurements of each field were upscaled to the spatial resolution of RADARSAT-2 images ( $text{6}times text{5}$ and ${text{9}}times {text{5 m}}^{2}$) using either simple kriging or ordinary kriging. The results were cross validated using the surface scattering component, which is extracted from the Freeman–Durden decomposition applied to fully polarimetric RADARSAT-2 images. They show that the kriging-based soil moisture better represents RADARSAT-2 surface scattering with strong clustered linear regressions (R2 greater than ∼0.6, RMSE lower than ∼0.9 dB, and p-value of slope less than 0.05) than the nonkriged soil moisture samples.
Auteurs: Imen Gherboudj;Ramata Magagi;Aaron A. Berg;Brenda Toth;
Apparue dans: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Date publication: 05.-2017, volume: 10, issue:5, pages: 1813 - 1823
Editeur: IEEE
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» Characterizing the Instantaneous Connectivity of Large-Scale Urban Vehicular Networks
Résumé:
Understanding of the network topology is a basic building block towards the design of efficient networking solutions. In the context of vehicular networks, such a step is especially crucial due to the highly dynamic nature of vehicles that can lead to strong instantaneous variations in the structure of the network. This notwithstanding, and despite the soon-to-come real-world deployment of vehicle-to-vehicle communication technologies, we still lack a clear understanding of vehicular network topological properties. In this paper, we present a complex network analysis of the instantaneous topology of a realistic vehicular network in Cologne, Germany. Our study unveils a poorly connected topology, with very limited availability, reliability, and navigability. We also examine the vehicular network topology in a second scenario, i.e., Zurich, Switzerland. The comparative analysis shows how simplistic mobility models can lead to unrealistic overly connected topologies.
Auteurs: Diala Naboulsi;Marco Fiore;
Apparue dans: IEEE Transactions on Mobile Computing
Date publication: 05.-2017, volume: 16, issue:5, pages: 1272 - 1286
Editeur: IEEE
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» Choosing Bootstrap Method for the Estimation of the Uncertainty of Traffic Noise Measurements
Résumé:
The environmental acoustic noise is considered as a big risk for today’s population health. Consequently, the regulations in many countries commit themselves to control the exposition of people, imposing limits to the noise level. In the comparison between the measured value and the threshold, the uncertainty of the measured value has to be taken into account. In this paper, a procedure for the evaluation of the uncertainty of traffic noise measurements due to the variability of the measurand is proposed. A deep analysis of five bootstrap (normal, basic percentile, t-student, bias corrected percentile, and bias corrected and accelerated percentile) methods is performed to obtain accurate confidence intervals for the indicator L_{math\rm{ eq},A} without necessity to make normal theory assumptions. From the comparison with the classical method (according to Guide to the Expression of Uncertainty in Measurement (ISO GUM)), the novel approach reveals to be more effective for estimating both the expected value and the uncertainty of the short-term equivalent sound pressure level when a large data set is not available.
Auteurs: Consolatina Liguori;Alessandro Ruggiero;Paolo Sommella;Domenico Russo;
Apparue dans: IEEE Transactions on Instrumentation and Measurement
Date publication: 05.-2017, volume: 66, issue:5, pages: 869 - 878
Editeur: IEEE
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» Ciphertext-Only Attack on Linear Feedback Shift Register-Based Esmaeili-Gulliver Cryptosystem
Résumé:
Esmaeili and Gulliver recently proposed a secret key cryptosystem based on error-correcting codes in which a codeword modified by random insertions, deletions, and errors is used as a ciphertext. The secret keys used in this cryptosystem consist of random numbers generated by synchronized random number generators that are implemented using two distinct linear feedback shift registers (LFSRs) in each encryptor and decryptor, respectively. In this letter, we propose a ciphertext-only attack to break the Esmaeili-Gulliver cryptosystem based on LFSRs. The proposed attack requires $O(n)$ consecutive ciphertexts, where $n$ is the number of shift registers in the LFSR, which is the secret key size. The proposed attack consists of two steps, and the time complexity of the first step is linear in the secret key size while the second step is a polynomial-time algorithm.
Auteurs: Yongwoo Lee;Young-Sik Kim;Jong-Seon No;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 971 - 974
Editeur: IEEE
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» Circuit Designs of High-Performance and Low-Power RRAM-Based Multiplexers Based on 4T(ransistor)1R(RAM) Programming Structure
Résumé:
Routing multiplexers based on pass-transistors or transmission gates are an essential components in many digital integrated circuits. However, whatever structure is employed, CMOS multiplexers have two major limitations: 1) their delay is linearly related to the input size; 2) their performance degrades seriously when operated in near- $V_{t}$ regime. Resistive Random Access Memory (RRAM) technology brings opportunities of overcoming these limitations by exploiting the properties of RRAMs and associated programming structures. In this paper, we propose new one-level, two-level and tree-like multiplexers circuit designs using 4T(ransistors)1R(RAM) elements and we compare them to naive one-level multiplexers. We consider the main physical design aspects associated with 4T1R-based multiplexers, such as the layout implications using a 7 nm FinFET technology, and the co-integration of low-voltage nominal power supply and high-voltage programming supply. Electrical simulations show that using a 7 nm FinFET transistor technology, the proposed 4T1R-based multiplexers reduce delay by $2times $ and energy by $2.8times $ over naive 4T1R and 2T1R counterparts. At nominal working voltage, considering an input size ranging from 2 to 50, the proposed 4T1R-based multiplexers reduces Area-Delay and Power-Delay products by $2.6times $ and $3.8times $ respectively, as compared to best CMOS multiplexers. In the near- $V_{t}$ regime, the proposed 4T1R-based multiplexer demonstrates - 2times $ larger delay efficiency over the best CMOS multiplexer. The proposed 4T1R-based multiplexers operating at near- $V_{t}$ regime can still achieve up to 22% delay improvement when compared to best CMOS multiplexers working at nominal voltage.
Auteurs: Xifan Tang;Edouard Giacomin;Giovanni De Micheli;Pierre-Emmanuel Gaillardon;
Apparue dans: IEEE Transactions on Circuits and Systems I: Regular Papers
Date publication: 05.-2017, volume: 64, issue:5, pages: 1173 - 1186
Editeur: IEEE
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» Circuit Implementation of Data-Driven TSK-Type Interval Type-2 Neural Fuzzy System With Online Parameter Tuning Ability
Résumé:
This paper proposes a new circuit for implementing a reduced-interval type-2 neural fuzzy system using weighted bound-set boundaries (RIT2NFS-WB) with online tuning ability. The antecedent and consequent parts of the RIT2NFS-WB use interval type-2 fuzzy sets and Takagi-Sugeno-Kang (TSK) rules with interval combination parameters, respectively. In the software implementation, the structure and parameters of the RIT2NFS-WB are learned through firing-strength-based rule generation and gradient descent algorithms, respectively. The software-designed RIT2NFS-WB is then transferred to a circuit implementation with online parameter-tuning ability; the hardware version is called the RIT2NFS-WB(HL). The RIT2NFS-WB(HL) is characterized by its online tuning ability with updatable consequent and weighting parameters. To the best of our knowledge, the RIT2NFS-WB(HL) is the first TSK-type interval type-2 neural fuzzy circuit with online parameter tuning ability in the literature. To take advantage of the inherent parallel processing property of the rules, a parallel processing technique is utilized in the RIT2NFS-WB(HL) to achieve computational speedup. The RIT2NFS-WB(HL) is applied to examples of online system modeling and sequence prediction to demonstrate the system's functionality.
Auteurs: Chia-Feng Juang;Kai-Jie Juang;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 4266 - 4275
Editeur: IEEE
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» CIS Publication Spotlight [Publication Spotlight]
Résumé:
Presents a synopsis of the latest books in the area of computational intelligence.
Auteurs: Haibo He;Jon Garibaldi;Kay Chen Tan;Graham Kendall;Yaochu Jin;Yew Soon Ong;
Apparue dans: IEEE Computational Intelligence Magazine
Date publication: 05.-2017, volume: 12, issue:2, pages: 20 - 22
Editeur: IEEE
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» Classification and Prediction of Clinical Improvement in Deep Brain Stimulation From Intraoperative Microelectrode Recordings
Résumé:
We present a random forest (RF) classification and regression technique to predict, intraoperatively, the unified Parkinson's disease rating scale (UPDRS) improvement after deep brain stimulation (DBS). We hypothesized that a data-informed combination of features extracted from intraoperative microelectrode recordings (MERs) can predict the motor improvement of Parkinson's disease patients undergoing DBS surgery. We modified the employed RFs to account for unbalanced datasets and multiple observations per patient, and showed, for the first time, that only five neurophysiologically interpretable MER signal features are sufficient for predicting UPDRS improvement. This finding suggests that subthalamic nucleus (STN) electrophysiological signal characteristics are strongly correlated to the extent of motor behavior improvement observed in STN-DBS.
Auteurs: Kyriaki Kostoglou;Konstantinos P. Michmizos;Pantelis Stathis;Damianos Sakas;Konstantina S. Nikita;Georgios D. Mitsis;
Apparue dans: IEEE Transactions on Biomedical Engineering
Date publication: 05.-2017, volume: 64, issue:5, pages: 1123 - 1130
Editeur: IEEE
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» Classification of Three Types of Walking Activities Regarding Stairs Using Plantar Pressure Sensors
Résumé:
In this letter, we propose a novel method for classifying ambulatory activities using eight plantar pressure sensors within smart shoes. Using these sensors, pressure data of participants can be collected regarding level walking, stair descent, and stair ascent. Analyzing patterns of the ambulatory activities, we present new features with which to describe the ambulatory activities. After selecting critical features, a multi-class support vector machine algorithm is applied to classify these activities. Applying the proposed method to the experimental database, we obtain recognition rates up to 95.2% after six steps.
Auteurs: Gu-Min Jeong;Phuc Huu Truong;Sang-Il Choi;
Apparue dans: IEEE Sensors Journal
Date publication: 05.-2017, volume: 17, issue:9, pages: 2638 - 2639
Editeur: IEEE
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» Closed-Form BER Expressions for HSV-Based ${M}$ PSK-CSK Systems
Résumé:
The analysis of hybrid phase shift keying-color shift keying ( ${M}$ PSK-CSK) systems under the additive white Gaussian noise model is presented. ${M}$ PSK-CSK systems are formed by mapping phase shift keying symbols to color shift keying using hue-saturation-value color space. Analytical expressions of bit error rate are given for ${M} =2$ , 4, 8, and 16, to validate the simulation results published previously.
Auteurs: Alain Richard Ndjiongue;Thokozani Shongwe;Hendrik C. Ferreira;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1023 - 1026
Editeur: IEEE
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» Cloud Computing
Résumé:
Technologies and market players will change over time, but the bottom line is that cloud computing is here to stay.
Auteurs: Grace A. Lewis;
Apparue dans: Computer
Date publication: 05.-2017, volume: 50, issue:5, pages: 8 - 9
Editeur: IEEE
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» CloudScout: A Non-Intrusive Approach to Service Dependency Discovery
Résumé:
Nowadays, numerous enterprises are migrating their applications into cloud computing environments. Typically, the applications are composed of several dependent service components that span many hosts and network devices. In light of this, exploring the dependency between service components can be beneficial for achieving fast network application response time. Moreover, it is significant to consolidate service components according to resource constraints, service dependency, and network structure. However, it is a tedious task to discover the dependency among service components without expert knowledge of the running application. In this paper, we propose CloudScout, a non-intrusive approach that is capable of automatically discovering dependent service components. CloudScout analyzes the correlation among service components based on the time-series information from system monitoring logs. We address two key challenges in CloudScout: service distance calculation and dependent service clustering. We conduct experiments on five applications with 290 service components that span 20 physical hosts across two data centers. The experimental results demonstrate that CloudScout can successfully discover the dependency among service components and facilitate reducing the network latency of network applications and distributed applications.
Auteurs: Jianwei Yin;Xinkui Zhao;Yan Tang;Chen Zhi;Zuoning Chen;Zhaohui Wu;
Apparue dans: IEEE Transactions on Parallel and Distributed Systems
Date publication: 05.-2017, volume: 28, issue:5, pages: 1271 - 1284
Editeur: IEEE
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» Clutch Judder Classification and Prediction: A Multivariate Statistical Analysis Based on Torque Signals
Résumé:
Judder is the term used in the automotive industry to describe the longitudinal oscillation in a vehicle during its clutch system engagement. Past research has shown that judder can be explained using a behavior of slip speed and temperature captured by the clutch torque. This paper proposes and implements an innovative learning system for better characterization of the judder phenomenon. It is based on a multivariate data-driven analysis from torque signals. Our experimental results have been carried out using the following main resources: dry clutch system, passenger car, test bench, and six different organic facing materials. The multivariate statistical analysis implemented has allowed the development of a computationally efficient and highly accurate learning model to discriminate the torque signals from different facings, using few features and a regularized version of a standard linear classifier. Given this multivariate framework and calculating the correlation pairwisely to a known gold material, it has also been possible to predict judder problem in the vehicle based on a standard test bench in laboratory. We believe that the findings of this paper might reduce significantly the time of development and the cost of testing new friction materials for allowing judder-free performance on vehicles.
Auteurs: Ivan R. S. Gregori;Ivandro Sanches;Carlos E. Thomaz;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 4287 - 4295
Editeur: IEEE
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» Co-Channel Interference and Background Noise in $kappa$ - $mu$ Fading Channels
Résumé:
In this letter, we derive novel analytical and closed form expressions for the outage probability, when the signal-of-interest (SoI) and the interferer experience $kappa $ $mu $ fading in the presence of Gaussian noise. Most importantly, these expressions hold true for independent and non-identically distributed $kappa $ $mu $ variates, without parameter constraints. We also find the asymptotic behaviour when the average signal to noise ratio of the SoI is significantly larger than that of the interferer. It is worth highlighting that our new solutions are very general owing to the flexibility of the $kappa $ $mu $ fading model.
Auteurs: Nidhi Bhargav;Carlos Rafael Nogueira da Silva;Young Jin Chun;Simon L. Cotton;Michel Daoud Yacoub;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1215 - 1218
Editeur: IEEE
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» Co-Design Strategies for Energy-Efficient UWB and UHF Wireless Systems
Résumé:
This paper reviews the most recent methods, combining nonlinear harmonic-balance-based analysis with electromagnetic (EM) simulation, for optimizing, at the circuit level, modern radiative RF/microwave systems. In order to maximize the system efficiency, each subsystem must be designed layoutwise, accounting for the presence of the others, that is, accounting for its actual terminations, rather than the ideal ones ( $50~Omega$ ). In this way, the twofold goal of minimizing size and losses of the system is obtained by reducing intersystem matching networks. Indeed, terminations are complex, frequency-dispersive, and variable with the signal level, if active operations are concerned, and are responsible for performance degradation if not properly optimized. This approach is nowadays necessary, given the ever increased spread of pervasively distributed RF microsystems adopting miniaturized antennas, such as radio frequency identification (RFID) or wireless sensor networks, that must be low-cost, low-profile, low-power, and must simultaneously perform localization, identification, and sensing. For the design of a transmitter and a receiver connected with the respective antennas, suitable figures of merit are considered, encompassing radiation and nonlinear performance. Recent representative low-profile realizations, adopting ultra-wideband (UWB) excitations are used to highlight the benefit of the proposed nonlinear/EM approach for next generation energy autonomous microsystem, such as UWB-RFID tags.
Auteurs: Alessandra Costanzo;Diego Masotti;Marco Fantuzzi;Massimo Del Prete;
Apparue dans: IEEE Transactions on Microwave Theory and Techniques
Date publication: 05.-2017, volume: 65, issue:5, pages: 1852 - 1863
Editeur: IEEE
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» Co-Saliency Detection via a Self-Paced Multiple-Instance Learning Framework
Résumé:
As an interesting and emerging topic, co-saliency detection aims at simultaneously extracting common salient objects from a group of images. On one hand, traditional co-saliency detection approaches rely heavily on human knowledge for designing handcrafted metrics to possibly reflect the faithful properties of the co-salient regions. Such strategies, however, always suffer from poor generalization capability to flexibly adapt various scenarios in real applications. On the other hand, most current methods pursue cosaliency detection in unsupervised fashions. This, however, tends to weaken their performance in real complex scenarios because they are lack of robust learning mechanism to make full use of the weak labels of each image. To alleviate these two problems, this paper proposes a new SP-MIL framework for co-saliency detection, which integrates both multiple instance learning (MIL) and self-paced learning (SPL) into a unified learning framework. Specifically, for the first problem, we formulate the co-saliency detection problem as a MIL paradigm to learn the discriminative classifiers to detect the co-saliency object in the “instance-level”. The formulated MIL component facilitates our method capable of automatically producing the proper metrics to measure the intra-image contrast and the inter-image consistency for detecting co-saliency in a purely self-learning way. For the second problem, the embedded SPL paradigm is able to alleviate the data ambiguity under the weak supervision of co-saliency detection and guide a robust learning manner in complex scenarios. Experiments on benchmark datasets together with multiple extended computer vision applications demonstrate the superiority of the proposed framework beyond the state-of-the-arts.
Auteurs: Dingwen Zhang;Deyu Meng;Junwei Han;
Apparue dans: IEEE Transactions on Pattern Analysis and Machine Intelligence
Date publication: 05.-2017, volume: 39, issue:5, pages: 865 - 878
Editeur: IEEE
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» CO2 Laser Applications in Optical Fiber Components Fabrication and Treatment: A Review
Résumé:
CO2 laser has been widely used in material processing, manufacturing, and medical and military applications since its invention in 1964. Typically for optical fiber components fabrication and treatment, CO2 laser has been reported intensively in stress and birefringence modification, long period grating fabrication, thermal regeneration, optical device fabrication, surface polishing, photosensitivity enhancement, and so on. The reason behind this is due to the advantages of high absorption, fast thermal response, low contamination, dynamic control, and focused heating area owned by the CO2 laser treatment technique. In this paper, a wide variety of CO2 laser applications in optical fiber components fabrication and treatment are reviewed in terms of procedure and principle. The advantages of using CO2 laser and the supremacy of the optical fiber components fabricated or treated by CO2 laser are discussed as well.
Auteurs: Man-Hong Lai;Kok-Sing Lim;Dinusha Serandi Gunawardena;Yen-Sian Lee;Harith Ahmad;
Apparue dans: IEEE Sensors Journal
Date publication: 05.-2017, volume: 17, issue:10, pages: 2961 - 2974
Editeur: IEEE
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» Code-Aided DOA Estimation From Turbo-Coded QAM Transmissions: Analytical CRLBs and Maximum Likelihood Estimator
Résumé:
In this paper, we address the problem of direction of arrival (DOA) estimation from turbo-coded square-QAM-modulated transmissions. We devise a new code-aware direction finding concept, derived from maximum likelihood (ML) theory, wherein the soft information provided by the soft-input soft-output decoder, in the form of log-likelihood ratios, is exploited to assist the estimation process. At each turbo iteration, the decoder output is used to refine the ML DOA estimate. The latter is in turn used to perform a more focused receiving beamforming thereby providing more reliable information-bearing sequences for the next turbo iteration. In order to benchmark the new estimator, we also derive the analytical expressions for the exact Cramer-Rao lower bounds (CRLBs) of code-aided (CA) DOA estimates. Simulation results will show that the new CA direction finding scheme lies between the two traditional schemes of completely non-data-aided and data-aided (DA) estimations. Huge performance improvements are achieved by embedding the direction finding and receive beamforming tasks into the turbo iteration loop. Moreover, the new CA DOA estimator reaches the new CA CRLBs over a wide range of practical SNRs thereby confirming its statistical efficiency. As expected intuitively, its performance further improves at higher coding rates and/or lower modulation orders.
Auteurs: Faouzi Bellili;Chaima Elguet;Souheib Ben Amor;Sofiène Affes;Alex Stéphenne;
Apparue dans: IEEE Transactions on Wireless Communications
Date publication: 05.-2017, volume: 16, issue:5, pages: 2850 - 2865
Editeur: IEEE
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» Coded Caching for Multi-level Popularity and Access
Résumé:
To address the exponentially rising demand for wireless content, the use of caching is emerging as a potential solution. It has been recently established that joint design of content delivery and storage (coded caching) can significantly improve performance over conventional caching. Coded caching is well suited to emerging heterogeneous wireless architectures which consist of a dense deployment of local-coverage wireless access points (APs) with high data rates, along with sparsely-distributed, large-coverage macro-cell base stations (BS). This enables design of coded caching-and-delivery schemes that equip APs with storage, and place content in them in a way that creates coded-multicast opportunities for combining with macro-cell broadcast to satisfy users even with different demands. Such coded-caching schemes have been shown to be order-optimal with respect to the BS transmission rate, for a system with single-level content, i.e., one where all content is uniformly popular. In this paper, we consider a system with non-uniform popularity content which is divided into multiple levels, based on varying degrees of popularity. The main contribution of this paper is the derivation of an order-optimal scheme which judiciously shares cache memory among files with different popularities. To show order-optimality we derive new information-theoretic lower bounds, which use a sliding-window entropy inequality, effectively creating a non-cut-set bound. We also extend the ideas to when users can access multiple caches along with the broadcast. Finally, we consider two extreme cases of user distribution across caches for the multi-level popularity model: a single user per cache (single-user setup) versus a large number of users per cache (multi-user setup), and demonstrate a dichotomy in the order-optimal strategies for these two extreme cases.
Auteurs: Jad Hachem;Nikhil Karamchandani;Suhas N. Diggavi;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3108 - 3141
Editeur: IEEE
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» Coding for Classical-Quantum Channels With Rate Limited Side Information at the Encoder: Information-Spectrum Approach
Résumé:
We study the hybrid classical-quantum version of the channel coding problem for the famous Gel’fand–Pinsker channel. In the classical setting for this channel the conditional distribution of the channel output given the channel input is a function of a random parameter called the channel state. We study this problem when a rate limited version of the channel state is available at the encoder for the classical-quantum Gel’fand–Pinsker channel. We establish the capacity region for this problem in the information-spectrum setting. The capacity region is quantified in terms of spectral-sup classical mutual information rate and spectral-inf quantum mutual information rate.
Auteurs: Naqueeb Ahmad Warsi;Justin P. Coon;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3322 - 3331
Editeur: IEEE
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» Coil-Shaped Electrodes to Reduce the Current Variation of Drop-Casted OTFTs
Résumé:
Coil-shaped structures are proposed to reduce the impact of variable grain alignment on the drive current of the polycrystalline organic thin-film transi-stors (OTFT). Top-gate, bottom-contact polycrystalline OTFT is fabricated with the drop-casted semiconducting layer to verify the proposed structures. The relative standard deviation (RSD) defined as the ratio of standard deviation, and the average of drive current is used for comparing variations between different structures. Coil-shaped transistors have a significantly lower (22%) RSD, compared with the conventional structures (61%). Finally, we present a technique for designing symmetric coil-shaped OTFTs of any arbitrary W/L ratio (>1) with reduced current variation.
Auteurs: H. M. Dipu Kabir;Zubair Ahmed;Lining Zhang;Mansun Chan;
Apparue dans: IEEE Electron Device Letters
Date publication: 05.-2017, volume: 38, issue:5, pages: 645 - 648
Editeur: IEEE
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» Color Image-Guided Boundary-Inconsistent Region Refinement for Stereo Matching
Résumé:
Cost computation, cost aggregation, disparity optimization, and disparity refinement are the four main steps for stereo matching. While the first three steps have been widely investigated, few efforts have been taken on disparity refinement. In this paper, we propose a color image-guided disparity refinement method to further remove the boundary-inconsistent regions on disparity map. First, the origins of boundary-inconsistent regions are analyzed. Then, these regions are detected with the proposed hybrid-superpixel-based strategy. Finally, the detected boundary-inconsistent regions are refined by a modified weighted median filtering method. Experimental results on various stereo matching conditions validate the effectiveness of the proposed method. Furthermore, depth maps obtained by active depth acquisition devices like Kinect can also be well refined with our proposed method.
Auteurs: Jianbo Jiao;Ronggang Wang;Wenmin Wang;Dagang Li;Wen Gao;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 1155 - 1159
Editeur: IEEE
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» ColorSketch: A Drawing Assistant for Generating Color Sketches from Photos
Résumé:
A color sketch creates a vivid depiction of a scene using sparse pencil strokes and casual colored brush strokes. The interactive drawing system ColorSketch can help novice users generate color sketches from photos. To preserve artistic freedom and expressiveness, the proposed system gives users full control over pencil strokes, while automatically augmenting pencil sketches using color mapping, brush stroke rendering, and blank area creation. Experimental and user study results demonstrate that users, especially novices, can create better color sketches with our system than when using traditional manual tools.
Auteurs: Guanbin Li;Sai Bi;Jue Wang;Yingqing Xu;Yizhou Yu;
Apparue dans: IEEE Computer Graphics and Applications
Date publication: 05.-2017, volume: 38, issue:3, pages: 70 - 81
Editeur: IEEE
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» Combined Speed and Direct Thrust Force Control of Linear Permanent-Magnet Synchronous Motors With Sensorless Speed Estimation Using a Sliding-Mode Control With Integral Action
Résumé:
A sliding-mode-based control scheme with integral action for combined speed and direct thrust force control of a linear permanent-magnet synchronous motor is proposed. A nonlinear state-space model for the combined dynamics of speed and thrust force as system states is utilized for the synthesis of the sliding-mode control law. Direct integral action is also included in the control law to eliminate the steady-state error in the speed tracking. The sensorless speed estimation is performed by using an adaptive flux observer with a modified dual boundary layer sliding-mode component. Lyapunov stability analysis to prove the global asymptotic stabilities of both the controller and observer is provided. The effectiveness of the proposed method is validated experimentally and demonstrates excellent transient and steady-state speed control performance.
Auteurs: Muhammad Ali Masood Cheema;John Edward Fletcher;Mohammad Farshadnia;Dan Xiao;Muhammad Faz Rahman;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 3489 - 3501
Editeur: IEEE
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» Comments on “An Analytical Design Method for a Novel Dual-Band Unequal Coupler With Four Arbitrary Terminated Resistances”
Résumé:
IN the above paper [1], the authors proposed a dual-band unequal power division branch line coupler(BLC) with four arbitrary terminated resistance using dual-band impedance matching network (IMN) and BLC with complex port impedance. However the authors have not considered the transmission phase of the IMNs [2] and the BLC, which leads to non-quadrature phase difference (6 S21􀀀6 S31 6= 90) at the output ports when the termination resistances are unequal.
Auteurs: Rakesh Sinha;Arijit De;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 4068 - 4069
Editeur: IEEE
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» Comments on “Simultaneous Reduction of Petri Nets and Linear Constraints for Efficient Supervisor Synthesis”
Résumé:
The above paper [1] proposes a method to reduce simultaneously a Petri net model and the linear constraints. The reduced result preserves the control specification and the liveness. This note shows via some simple counterexamples that some results claimed in the above paper are incorrect, and then presents the corresponding corrections for two of the results.
Auteurs: Ning Ran;Shouguang Wang;Hongye Su;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2603 - 2606
Editeur: IEEE
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» Compact 35–70 GHz SPDT Switch With High Isolation for High Power Application
Résumé:
This letter proposes a broadband high isolation and high power compact single pole double throw (SPDT) switch. In contrast to the traditional structure of grounded source pad, the source pad of the shunt-stacked FET is absorbed into the transmission line, and the drain of the shunt-stacked FET is grounded to a via-hole. This structure helps to extend the operation bandwidth and reduce the chip size. The proposed SPDT switch is composed of six shunt-stacked FET units on each branch with this novel structure. Stacked FETs technique increases the voltage handling by placing two FETs in series. It has been fabricated using a commercial $0.1~boldsymbol {mu }text{m}$ GaAs pseudomorphic high-electron-mobility transistor (PHEMT) process. The chip size is $1.2times 0.8$ mm2. The switch operates at the frequency range of 35–70 GHz with less than 3 dB insertion loss and more than 40-dB isolation. The switch demonstrates a 1 dB insertion loss compression with a 20.2 dBm input power at 31 GHz. The isolation is larger than 30 dB from 10 to 95 GHz. To the best of the authors’ knowledge, this broadband isolation performance is among the best of the reported SPDT switches.
Auteurs: Li Zhao;Wen-Feng Liang;Jian-Yi Zhou;Xin Jiang;
Apparue dans: IEEE Microwave and Wireless Components Letters
Date publication: 05.-2017, volume: 27, issue:5, pages: 485 - 487
Editeur: IEEE
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» Compact Folded Dipole With Embedded Matching Loop for Universal Tag Applications
Résumé:
A coin-shaped folded dipole is proposed for designing a UHF tag that can be placed in free space and on metal. The proposed tag antenna is compact ( $0.095lambda )$ and low in profile (1.6 mm). It is composed of a matching loop, which is encircled by two patch-shaped radiating arms, forming an embedded structure that has high compactness. Slots are etched in the radiators for fine-tuning the resonant frequency. An equivalent circuit has also been obtained for analyzing the impedance characteristics of the tag antenna across the frequency range, and it is found that the radiating element itself is capacitive and inclusion of the matching loop is essential for making the tag antenna inductive for achieving good matching with the chip. Simulation and experiment have been conducted to study the charateristics of the proposed tag antenna. When tested in free space with an Effective Isotropic Radiated Power (EIRP) input power of 3.28 W, the tag antenna is able to reach a maximum read range of 5.2 m, but it reduces to 1.8 m when placed on metal. Also, the resonant frequency of the proposed tag antenna is found to be stable and not affected much by its backing object.
Auteurs: Fwee-Leong Bong;Eng-Hock Lim;Fook-Loong Lo;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2173 - 2181
Editeur: IEEE
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» Compact Multimode Monopole Antenna for Metal-Rimmed Mobile Phones
Résumé:
A compact multimode monopole antenna for hepta-band metal-rimmed smartphones is proposed. The metal bezel is kept unbroken and no lumped element is needed. To cover the low band, the bezel mode is excited by a capacitive coupling vertical plate, and a bandwidth enhancement technique is introduced for this mode. For the high band, printed multiple branches on both sides of substrate are well designed to obtain multiple modes to cover a wide band. With the proposed structure, the frequency bands can be widened by tuning and optimization. The new-type monopole occupies an area of $60 times 5 times 5$ mm $^{3}$ on a $120 times 60$ mm $^{2}$ system board, which has a narrow ground clearance and a low profile. A prototype is fabricated and measured to validate the proposed design. Measured results show that the proposed antenna has two impedance bands with $S_{11}$ less than −6 dB, i.e., 23% for the low band (0.76–0.96 GHz) and 57% for the high band (1.51–2.72 GHz). The proposed monopole antenna is capable of covering the GSM/DCS/PCS/UMTS and LTE2300/2500 bands for modern metal-rimmed mobile phone applications.
Auteurs: Yaohui Yang;Zhiqin Zhao;Wei Yang;Zaiping Nie;Qing-Huo Liu;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2297 - 2304
Editeur: IEEE
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» Compact Neuromorphic System With Four-Terminal Si-Based Synaptic Devices for Spiking Neural Networks
Résumé:
In this paper, we propose a compact neuromorphic system that can work with four-terminal Si-based synaptic devices for spiking neural networks. The system consists of Si-based floating-body synaptic transistors and integrate-and-fire neuron circuit. The synaptic device can change its weight using floating-body effect and charge injection into the floating gate. The neuron circuit integrates signals from the synaptic devices through current mirrors and generates an action-potential when the integrated signal value exceeds a threshold value. The generated action potential that is transmitted to postsynaptic neurons is simultaneously returned to the back gate of the synaptic device for the change of weight based on spike-timing-dependent-plasticity. As the four-terminal synaptic device can transmit preneuron signals and change its weight at the same time, we can constitute the compact neuromorphic system without additional switches or logic operation and emulate the operation of neuron with a minimum number of devices and power dissipation (~3 pJ).
Auteurs: Jungjin Park;Min-Woo Kwon;Hyungjin Kim;Sungmin Hwang;Jeong-Jun Lee;Byung-Gook Park;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 2438 - 2444
Editeur: IEEE
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» Compact UHF Three-Element Sequential Rotation Array Antenna for Satcom Applications
Résumé:
This paper proposes a miniaturized UHF antenna with three sequentially rotated elements operating at 433 MHz for Satcom applications. Like most of its former counterparts, the antenna consists of a main body with three radiation elements driven by a feeding network. To evaluate the matching characteristics of the main body, a united reflection coefficient for the three elements, taking into consideration the coupling between them, is derived. The main body is formed by three sequentially rotationally arranged bent planar inverted-F antenna elements, which helps dramatically reduce the size of the antenna. To drive the main body, a new compact feeding network based on spiral-shaped Wilkinson power divider is also developed, achieving three-way power splitting and 120° phase shifting. It has the merits of compact planar structure, equal power splitting, and high isolation between output ports. In this way, a sequential rotation array antenna with compact size (Ø $0.216lambda _{0}$ ), low cost, easy fabrication, and good performance is realized. A prototype is fabricated and measured, and the results prove the good performance of the proposed design.
Auteurs: Shaowei Liao;Quan Xue;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2328 - 2338
Editeur: IEEE
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» Comparative Analysis of the Doubly Fed Induction Generator (DFIG) Under Balanced Voltage Sag Using a Deadbeat Controller
Résumé:
This paper shows a Deadbeat controller for a wind generator during a balanced voltage sag condition. The control is made with a Stator Field Oriented Control technique using the DSOGI-QSG applied on the estimation of positive sequence of stator voltage vector and the stator current vector. The control strategy used is fully explained, and then it is tested using Matlab/Simulink, considering two scenarios: for the first one, the generator must be forced to generate reactive power and maintain the active power in zero, during voltage sag condition according with the new network requirements. For the second test, the generator must maintain rotor currents within safe levels to prevent damages for the windings during voltage sag. Simulation results and conclusions about controller perfomance during the voltage sag condition are presented.
Auteurs: Carlos Mario Rocha Osorio;Juan Sebastian Solis Chaves;Andre Luiz de Lacerda Ferreira Murari;Alfeu Joaozinho Sguarezi Filho;
Apparue dans: IEEE Latin America Transactions
Date publication: 05.-2017, volume: 15, issue:5, pages: 869 - 876
Editeur: IEEE
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» Comparing Performances of Crop Height Inversion Schemes From Multifrequency Pol-InSAR Data
Résumé:
Polarimetric synthetic aperture radar (SAR) interferometry has shown great potential to estimate the height of crops and forests by inverting simple scattering models of the canopy and the underlying soil. The random-volume-over-ground (RVoG) model assumes that the scatterers within the canopy (e.g., stalks and leaves) are not aligned along a preferred direction. If these scatterers are characterized by a correlation of orientations, then the scene is better described by the oriented-volume-over-ground (OVoG) model. This paper investigates the plausibility of the “random volume” and “oriented volume” assumptions, as well as the robustness of single- and dual-baseline inversion schemes in relation to agricultural crop height estimation. To this end, we implemented different single- and dual-baseline techniques for the inversion of the RVoG and OVoG models, and we evaluated their height retrieval performances with the help of simulated observations and experimental F-SAR measurements in L-, C-, and X-Bands. The inversion results revealed a positive relationship between the bias of the estimated height and the differential extinction when the RVoG inversion scheme is applied. By contrast, no such dependence was observed for the OVoG inversion, whose height estimates are on average consistent with the actual values (i.e., median bias below 10% in magnitude). Despite the observed superiority of dual-baseline approaches, the study also pointed out the feasibility of crop height estimation using single-baseline RVoG inversion schemes, provided the appropriate a priori constraints (e.g., on the extinction coefficient) and crop-specific configuration parameters (e.g., C-Band for maize, and C- and X-Bands for wheat).
Auteurs: Manuele Pichierri;Irena Hajnsek;
Apparue dans: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Date publication: 05.-2017, volume: 10, issue:5, pages: 1727 - 1741
Editeur: IEEE
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» Compartmental and Data-Based Modeling of Cerebral Hemodynamics: Nonlinear Analysis
Résumé:
Objective: As an extension to our study comparing a putative compartmental and data-based model of linear dynamic cerebral autoregulation (CA) and CO2-vasomotor reactivity (VR), we study the CA–VR process in a nonlinear context. Methods: We use the concept of principal dynamic modes (PDM) in order to obtain a compact and more easily interpretable input–output model. This in silico study permits the use of input data with a dynamic range large enough to simulate the classic homeostatic CA and VR curves using a putative structural model of the regulatory control of the cerebral circulation. The PDM model obtained using theoretical and experimental data are compared. Results: It was found that the PDM model was able to reflect accurately both the simulated static CA and VR curves in the associated nonlinear functions (ANFs). Similar to experimental observations, the PDM model essentially separates the pressure-flow relationship into a linear component with fast dynamics and nonlinear components with slow dynamics. In addition, we found good qualitative agreement between the PDMs representing the dynamic theoretical and experimental CO2-flow relationship. Conclusion: Under the modeling assumption and in light of other experimental findings, we hypothesize that PDMs obtained from experimental data correspond with passive fluid dynamical and active regulatory mechanisms. Significance: Both hypothesis-based and data-based modeling approaches can be combined to offer some insight into the physiological basis of PDM model obtained from human experimental data. The PDM modeling approach potentially offers a practical way to quantify the status of specific regulatory mechanisms in the CA–VR process.
Auteurs: Brandon Christian Henley;Dae C. Shin;Rong Zhang;Vasilis Z. Marmarelis;
Apparue dans: IEEE Transactions on Biomedical Engineering
Date publication: 05.-2017, volume: 64, issue:5, pages: 1078 - 1088
Editeur: IEEE
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» Compensating XPM Using a Low-Bandwidth Phase Modulator
Résumé:
We experimentally demonstrate, for the first time, cross-phase modulation (XPM) compensation using an optical phase modulator and low-bandwidth electronics. We first show that our nonlinearity compensator suppresses the XPM distortion from a 10-Gb/s ON-OFF keyed (OOK) channel on a continuous-wave (CW) probe signal. We then replace the CW tone with a 28-Gbaud quadrature phase-shift keyed (QPSK) signal and show that the OOK power can be doubled when XPM compensation is used. This demonstrates proof-of-concept for XPM compensation using phase modulators placed along a fiber link.
Auteurs: Benjamin Foo;Bill Corcoran;Arthur Lowery;
Apparue dans: IEEE Photonics Technology Letters
Date publication: 05.-2017, volume: 29, issue:9, pages: 699 - 702
Editeur: IEEE
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» Completion Time in Two-User Channels: An Information-Theoretic Perspective
Résumé:
Consider a multi-user channel, where each user has a large but non-replenishable bit pool to transmit. Completion time refers to the number of channel uses spent by each user to complete its transmission. In this paper, an information-theoretic formulation of completion time is based on the concept of constrained rates, which are defined over possibly different number of channel uses. Analogous to the capacity region, the completion time region characterizes all possible trade-offs among users’ completion times. For a two-user multi-access channel, it is shown that the completion time region is achieved by operating the channel in two independent phases: a multi-access phase when both users are transmitting, and a point-to-point phase when one user has finished and the other is still transmitting. Using a similar two-phase approach, the completion time regions (or inner and outer bounds) are established for a two-user Gaussian broadcast channel and a two-user Gaussian interference channel. It is observed that although consisting of two convex subregions, the completion time region may not be convex in general. Finally, optimization problems of minimizing the weighted sum completion time for a Gaussian multi-access channel and a Gaussian broadcast channel are solved, demonstrating the utility of the completion time approach.
Auteurs: Yuanpeng Liu;Elza Erkip;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3209 - 3223
Editeur: IEEE
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» Complex-Network-Inspired Design of Traffic Generation Patterns in Communication Networks
Résumé:
In this brief, we consider a generic type of communication network consisting of two kinds of nodes, i.e., hosts and routers, and only the hosts can generate and receive packets. In this kind of network, the traffic performance is closely related to the traffic generation pattern, which strongly depends on the hosts' locations. We employ a simulated annealing algorithm to find a near-optimal configuration of the hosts, which effectively balances the traffic loads and improves the overall traffic performance. Our study suggests that the traffic generation pattern is an important factor for communication network design.
Auteurs: Jiajing Wu;Yongxiang Xia;
Apparue dans: IEEE Transactions on Circuits and Systems II: Express Briefs
Date publication: 05.-2017, volume: 64, issue:5, pages: 590 - 594
Editeur: IEEE
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» Compressed FEC Codes With Spatial-Coupling
Résumé:
An error floor problem is observed for a spatially coupled sparse-regression (SCSR) code with limited sparsity in low-to-medium rates. This letter presents a scheme that also involves spatial-coupling and compressed-sensing (SCCS) similar to SCSR. We replace position modulation in SCSR by a general concatenated forward error control code. We introduce a chaining principle that improves the error floor behavior of the underlying code. We show that SCCS based on chained Hadamard codes can offer significantly improved performance.
Auteurs: Chulong Liang;Junjie Ma;Li Ping;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 987 - 990
Editeur: IEEE
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» Computation Time Analysis of the Magnetic Gear Analytical Model
Résumé:
This paper focuses on the computation time and precision of a linear 2-D magnetic gear analytical model. Two main models of magnetic gears are studied: 1) the first with an infinite relative permeability of yokes and 2) the second with a finite relative permeability of yokes. These models are based on the subdomain resolution of Laplace and Poisson equations. To accurately compute the magnetic field distribution, it is necessary to take into account certain harmonics of the various rings and other system harmonics due to modulation. Global system harmonics, which increase the value of computation time, must also be taken into account. If the magnetic gear has a high pole number, then computation time increases even more and no longer allows for system optimization. This paper proposes to compute magnetic field distribution using different harmonic selection methods in order to significantly reduce the computation time for the magnetic torque without any loss of accuracy.
Auteurs: Melaine Desvaux;Benjamin Traullé;Roman Le Goff Latimier;Stéphane Sire;Bernard Multon;Hamid Ben Ahmed;
Apparue dans: IEEE Transactions on Magnetics
Date publication: 05.-2017, volume: 53, issue:5, pages: 1 - 9
Editeur: IEEE
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» Computational Depth Sensing : Toward high-performance commodity depth cameras
Résumé:
Depth information plays an important role in a variety of applications, including manufacturing, medical imaging, computer vision, graphics, and virtual/augmented reality (VR/AR). Depth sensing has thus attracted sustained attention from both academia and industry communities for decades. Mainstream depth cameras can be divided into three categories: stereo, time of flight (ToF), and structured light. Stereo cameras require no active illumination and can be used outdoors, but they are fragile for homogeneous surfaces. Recently, off-the-shelf light field cameras have demonstrated improved depth estimation capability with a multiview stereo configuration. ToF cameras operate at a high frame rate and fit time-critical scenarios well, but they are susceptible to noise and limited to low resolution [3]. Structured light cameras can produce high-resolution, high-accuracy depth, provided that a number of patterns are sequentially used. Due to its promising and reliable performance, the structured light approach has been widely adopted for three-dimensional (3-D) scanning purposes. However, achieving real-time depth with structured light either requires highspeed (and thus expensive) hardware or sacrifices depth resolution and accuracy by using a single pattern instead.
Auteurs: Zhiwei Xiong;Yueyi Zhang;Feng Wu;Wenjun Zeng;
Apparue dans: IEEE Signal Processing Magazine
Date publication: 05.-2017, volume: 34, issue:3, pages: 55 - 68
Editeur: IEEE
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» Computational Design and Fabrication
Résumé:
Computer graphics research is increasingly interested in the high-level analysis and processing of geometric objects. By acquiring a structural or functional understanding of 3D shapes, researchers are able to tackle mid- to high-level design problems for which machine computations can replace or at least relieve human efforts. In parallel, with the rapid advances in 3D printing technologies, many design solutions explored by researchers and practitioners are focusing on the needs and constraints arising from physical fabrication. The contributions in this special issue are cross-disciplinary, connecting physical fabrication with design and processing tasks in new domains including circuit design, geospatial visualization, and 3D scanning, leading to never-before-seen 3D printing applications.
Auteurs: Bedrich Benes;David J. Kasik;Wilmot Li;Hao Zhang;
Apparue dans: IEEE Computer Graphics and Applications
Date publication: 05.-2017, volume: 38, issue:3, pages: 32 - 33
Editeur: IEEE
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» Computationally Efficient Adjustment of FACTS Set Points in DC Optimal Power Flow With Shift Factor Structure
Résumé:
Enhanced utilization of the existing transmission network is a cheaper and paramount alternative to building new transmission lines. Flexible ac transmission system (FACTS) devices are advanced technologies that offer transfer capability improvements via power flow control. Although many FACTS devices exist in power systems, their set points are not frequently changed for power flow control purposes, which is mainly due to the computational complexity of incorporating FACTS flexibility within the market problem. This paper proposes a computationally efficient method for adjustment of variable impedance-based FACTS set points, which is also compatible with existing market solvers. Thus, the method can be employed by the existing solvers with minimal modification efforts. This paper models FACTS reactance control as injections to keep the initial shift factors unchanged. Next, the paper formulates a dc optimal power flow that co-optimizes FACTS set points alongside generation dispatch. The resulting problem, which is in a nonlinear program, is then reformulated to a mixed-integer linear program. Finally, an engineering insight is leveraged to further reduce the computational complexity to a linear program. Simulation studies on IEEE 118-bus and Polish 2383-bus test cases show that the method is extremely effective in finding quality solutions and being very fast.
Auteurs: Mostafa Sahraei-Ardakani;Kory W. Hedman;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 1733 - 1740
Editeur: IEEE
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» Computerized Dungeons and Randomly Generated Worlds: From Rogue to Minecraft
Résumé:
Replayability is a major factor in the long-term enjoyment of a video game. Many games can be engrossing on the first playthrough, but those with fixed solutions and singular paths through multiple levels of skill can quickly lose their appeal after the first win. One approach to replayability is randomly generated content, which ensures a different playthrough each time. While numerous role-playing games simulate dice rolls, procedural generation in games used predefined seed values in combination with pseudorandom number generators to create entire levels and item sets. Rogue is one of the earliest examples of games to focus core gameplay elements around randomly generated levels and items, and its popularity within the UNIX community led to a group of dedicated fans making their own improvements on the game and sharing their modifications online. These derivatives of Rogue, known as “roguelikes,” have more than a 30-year history of development, and many are still maintained to this day.
Auteurs: Nathan Brewer;
Apparue dans: Proceedings of the IEEE
Date publication: 05.-2017, volume: 105, issue:5, pages: 970 - 977
Editeur: IEEE
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» Condensable Supersonic Jet Facility for Analyses of Transient Low-Temperature Gas Kinetics and Plasma Chemistry of Hydrocarbons
Résumé:
LEMPUS-2 facility is designed and built to study processes of cluster formation and plasma-chemical reactions that include atoms, molecules, and clusters, in supersonic jets. The facility is equipped with modern diagnostics tools and molecular-beam, electron-beam, mass-spectrometer, spectrometer, and laser systems for testing and fine-tuning technological processes in a laboratory environment. One of the key advantages of the discussed facility is that in a single system and a single experiment, it combines the tools for the activation of transient and steady-state supersonic flow with self-sustaining or nonself-sustaining discharge, and flow analysis using electron-beam spectroscopy and molecular-beam mass spectroscopy. Dry roughing and high-vacuum pumps enable accurate diagnostics of chemically reacting processes in virtually any gas mixture, including hydrocarbons. A pulsed flow regime controlled by developed in-house fast valves provides an efficient way to examine quasi-stationary flows at fairly high flow rates, with significant material and energy savings. The facility serves a number of purposes, from cluster-surface interaction studies with thin film and surface structure formation, to high-pressure jet expansions that emulate spacecraft nozzles at high altitudes, to technological process development, primarily focused on hydrocarbons. Details of key applications of the facility are presented that include the gas dynamics of cluster jets, the formation of heterogeneous clusters, the study of plasma-chemistry of hydrocarbons, and the thin film deposition.
Auteurs: A. E. Zarvin;V. V. Kalyada;V. Zh. Madirbaev;N. G. Korobeishchikov;M. D. Khodakov;A. S. Yaskin;V. E. Khudozhitkov;S. F. Gimelshein;
Apparue dans: IEEE Transactions on Plasma Science
Date publication: 05.-2017, volume: 45, issue:5, pages: 819 - 827
Editeur: IEEE
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» Conference Report on 2016 IEEE Symposium Series on Computational Intelligence (IEEE SSCI 2016) [Conference Reports]
Résumé:
Presents information on the IEEE SSCI 2016 Conference.
Auteurs: Yaochu Jin;Stefanos Kollias;
Apparue dans: IEEE Computational Intelligence Magazine
Date publication: 05.-2017, volume: 12, issue:2, pages: 18 - 19
Editeur: IEEE
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» Confidence Estimates in Simulation of Phase Noise or Spectral Density
Résumé:
In this paper, we apply the method of discrete simulation of power-law noise, developed by Timmer and König, Ashby, and Ashby and Patla, to the problem of simulating phase noise for a combination of power-law noises. We derive analytic expressions for the probability of observing a value of phase noise $ {mathcal{ L}}(f)$ or of any of the one-sided spectral densities $S_{phi }(f), S_{y}(f)$ , or $S_{x}(f)$ , for arbitrary superpositions of power-law noise.
Auteurs: Neil Ashby;
Apparue dans: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Date publication: 05.-2017, volume: 64, issue:5, pages: 872 - 878
Editeur: IEEE
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» Constraint Screening for Security Analysis of Power Networks
Résumé:
Consider a general security-constrained unit commitment (SCUC) problem for an arbitrary power network. This problem includes discrete variables corresponding to commitment parameters as well as demand and generation constraints, among others. Aside from its nonconvexity, SCUC is a large-scale problem for real-world systems due to the security constraints. The main objective of this paper is to propose an algorithm to eliminate a vast majority of linear security constraints in the high-dimensional mixed-integer SCUC problem in order to arrive at an equivalent reduced-order SCUC problem. To this end, we develop a parallel and computationally cheap algorithm for finding a minimal subset of security constraints whose satisfaction guarantees the satisfaction of all security constraints. The proposed algorithm does not depend on the unknown unit commitment parameters and allows the load forecasts to be imprecise. More specifically, a low-order model of the SCUC problem is found based on the topology of the power system, given lower and upper bounds on nodal power injections (to accommodate uncertainties in loads and generation productions), and the normal and emergency line ratings. This algorithm is tested on several power systems with as many as 5500 buses, for which each set of security constraints with millions of conditions is reduced to a minimal subset with only a few hundred conditions.
Auteurs: Ramtin Madani;Javad Lavaei;Ross Baldick;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 1828 - 1838
Editeur: IEEE
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» Construction of MDS Codes With Complementary Duals
Résumé:
A linear complementary dual (LCD) code is a linear code with complimentary dual. LCD codes have been extensively studied in literature. On the other hand, maximum distance separable (MDS) codes are an important class of linear codes that have found wide applications in both theory and practice. However, little is known about MDS codes with complimentary duals. The main purpose of this paper is to construct several classes of MDS codes with complimentary duals, i.e., LCD MDS codes, through generalized Reed-Solomon codes.
Auteurs: Lingfei Jin;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 2843 - 2847
Editeur: IEEE
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» Construction of Voronoi Diagram using the Hollow Sphere Concept
Résumé:
This paper implements an algorithm for constructing Voronoi regions using the method we call "hollow sphere". This principle uses the circle, sphere or hyper-sphere as a geometric structure taking into account an Euclidean space of an arbitrary dimension. Boris Deloné used the property of the empty circle to build the Delaunay triangulation; in our case, the same property is used to perform the validations of the hollow spheres, but without using triangles as a fundamental structure. For convenience sake, the hollow sphere as a circle so as to work in two dimensions will be explained and illustrated. However, there is no impediment to working with spheres to take the principles to a three-dimensional space. Furthermore, the properties of the hollow sphere are detailed and an algorithm of incremental construction is used with O(nlogn) time.
Auteurs: Netz Romero;Ricardo Barron;
Apparue dans: IEEE Latin America Transactions
Date publication: 05.-2017, volume: 15, issue:5, pages: 950 - 958
Editeur: IEEE
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» Contact-Force Control of a Flexible Timoshenko Arm in Rigid/Soft Environment
Résumé:
This technical note discusses a contact-force control problem of a one-link flexible arm. This flexible arm includes a Timoshenko beam, and thus we call it the flexible Timoshenko arm. The primary aim is to control the contact force at the contact point. To do so, we first apply our previously proposed force controller, which exponentially stabilizes the closed-loop system of a flexible Euler-Bernoulli arm, to the force-control problem of the flexible Timoshenko arm. We then show that our previously proposed force controller cannot exponentially stabilize the flexible Timoshenko arm. Next, we consider the flexible Timoshenko arm, which is making contact with a soft environment. By utilizing the damping force in the soft environment, as well as the controller, we try to overcome the problem. We then prove the exponential stability of the closed-loop system. Finally, we provide simulation results, and consider the validity of our force controller.
Auteurs: Takahiro Endo;Minoru Sasaki;Fumitoshi Matsuno;Yingmin Jia;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2546 - 2553
Editeur: IEEE
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» Content Ecosystem: Serving Diverse Interests in Our Community [From the Editor]
Résumé:
Presents the introductory editorial for this issue of the publication.
Auteurs: Min Wu;
Apparue dans: IEEE Signal Processing Magazine
Date publication: 05.-2017, volume: 34, issue:3, pages: 3 - 13
Editeur: IEEE
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» Continuous Top-k Monitoring on Document Streams
Résumé:
The efficient processing of document streams plays an important role in many information filtering systems. Emerging applications, such as news update filtering and social network notifications, demand presenting end-users with the most relevant content to their preferences. In this work, user preferences are indicated by a set of keywords. A central server monitors the document stream and continuously reports to each user the top-k documents that are most relevant to her keywords. Our objective is to support large numbers of users and high stream rates, while refreshing the top-k results almost instantaneously. Our solution abandons the traditional frequency-ordered indexing approach. Instead, it follows an identifier-ordering paradigm that suits better the nature of the problem. When complemented with a novel, locally adaptive technique, our method offers (i) proven optimality w.r.t. the number of considered queries per stream event, and (ii) an order of magnitude shorter response time (i.e., time to refresh the query results) than the current state-of-the-art.
Auteurs: Leong Hou U;Junjie Zhang;Kyriakos Mouratidis;Ye Li;
Apparue dans: IEEE Transactions on Knowledge and Data Engineering
Date publication: 05.-2017, volume: 29, issue:5, pages: 991 - 1003
Editeur: IEEE
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» Continuous-Time Marginal Pricing of Electricity
Résumé:
The current practice of discrete-time electricity pricing starts to fall short in providing an accurate economic signal reflecting the continuous-time variations of load and generation schedule in power systems. This paper introduces the fundamental mathematical theory of continuous-time marginal electricity pricing. We first formulate the continuous-time unit commitment problem as a constrained variational problem, and subsequently define the continuous-time economic dispatch (ED) problem where the binary commitment variables are fixed to their optimal values. We then prove that the continuous-time marginal electricity price equals to the Lagrange multiplier of the variational power balance constraint in the continuous-time ED problem. The proposed continuous-time marginal price is not only dependent to the incremental generation cost rate, but also to the incremental ramping cost rate of the units, thus embedding the ramping costs in calculation of the marginal electricity price. The numerical results demonstrate that the continuous-time marginal price manifests the behavior of the constantly varying load and generation schedule in power systems.
Auteurs: Masood Parvania;Roohallah Khatami;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 1960 - 1969
Editeur: IEEE
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» Control of a Grid-Forming Inverter Based on Sliding-Mode and Mixed ${H_2}/{H_infty }$ Control
Résumé:
A grid-forming inverter (GFI) is an important component for the operation of an islanded microgrid. Its purpose, similar to a conventional slack bus generator, is to build up a reference voltage for other distributed generating units in the microgrid. Usually, a nested-loop proportional plus integral (PI) control structure is employed to control a GFI in a $dq$ reference frame. However, conventional PI-based nested-loop control method has a deteriorative performance under parameter variations. In this paper, a novel nested-loop control strategy is proposed for control of a GFI system containing an ${LC}$ output filter and loads. The proposed method does not require a precise model for the inverter system and can better deal with uncertainties and ${LC}$ filter resonance without using any passive or active damping mechanisms. It utilizes a sliding-mode control in the inner current loop and a mixed ${H_2}/{H_infty }$ optimal control in the outer voltage loop, which provides the advantages of constant switching frequency, low total harmonic distortion, robustness against parameters variations, and fast transient response. The simulation and hardware experiments presented in this paper demonstrate the proposed controller's improved transient and steady-state performance in various key criteria, over conventional PI-based nested-loop control strategy.
Auteurs: Zhongwen Li;Chuanzhi Zang;Peng Zeng;Haibin Yu;Shuhui Li;Jing Bian;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 3862 - 3872
Editeur: IEEE
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» Control of Modular Multilevel Converters Under Singular Unbalanced Voltage Conditions With Equal Positive and Negative Sequence Components
Résumé:
This paper focuses on the control of Modular Multilevel Converters (MMC) for High Voltage DC (HVDC) applications during unbalanced AC grid voltage sags where positive and negative sequence voltages are equal. The control scheme is based on six arm energy regulators, six independent current controllers, and two reference calculation stages that convert the power references into grid and inner current references. Conventional inner AC currents reference calculation fails if the amplitude of the positive and the negative sequence AC grid voltages are equal, a state which is referred to in this paper as singular voltage condition. This paper discusses the types of network faults that cause this condition and proposes three different solutions to operate the converter in such scenarios. The adequacy of the proposed solutions is validated through simulations considering each of the problematic fault scenarios.
Auteurs: Eduardo Prieto-Araujo;Adrià Junyent-Ferré;Gerard Clariana-Colet;Oriol Gomis-Bellmunt;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 2131 - 2141
Editeur: IEEE
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» Control of Uncertain Sampled-Data Systems: An Adaptive Posicast Control Approach
Résumé:
This technical note proposes a discrete-time adaptive controller for the control of sampled-data systems. The design is inspired from the Adaptive Posicast Controller (APC) which was designed for time-delay systems in continuous time. Due to the performance degradation caused by digital approximation of continuous laws, together with the problem of assuming time-delays as integer multiples of sampling intervals, the benefits of APC could not be fully realized. In this technical note, these approximations/assumptions are eliminated. In addition, a disturbance observer is incorporated into the controller design which minimizes the effect of disturbances on the system. Extension to the case of uncertain input time-delay is also presented. The proposed approach is verified in simulation studies.
Auteurs: Khalid Abidi;Yildiray Yildiz;Anuradha Annaswamy;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2597 - 2602
Editeur: IEEE
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» Control With Minimal Cost-Per-Symbol Encoding and Quasi-Optimality of Event-Based Encoders
Résumé:
We consider the problem of stabilizing a continuous-time linear time-invariant system subject to communication constraints. A noiseless finite-capacity communication channel connects the process sensors to the controller/actuator. The sensor's state measurements are encoded into symbols from a finite alphabet, transmitted through the channel, and decoded at the controller/actuator. We suppose that the transmission of each symbol costs one unit of communication resources, except for one special symbol in the alphabet that is “free” and effectively signals the absence of transmission. We explore the relationship between the encoder's average bit-rate, its average consumption of communication resources, and the ability of the controller and encoder/decoder pair to stabilize the process. We present a necessary and sufficient condition for the existence of a stabilizing controller and encoder/decoder pair, which depends on the encoder's average bit-rate, its average resource consumption, and the unstable eigenvalues of the process. Moreover, if this condition is satisfied, a stabilizing encoding scheme can be constructed that consumes resources at an arbitrarily small rate, provided the encoder has access to a sufficiently precise clock or large memory. The paper concludes with the analysis of a simple emulation-based controller and event-based encoder/decoder pair that are easy to implement, stabilize the process, and have average bit-rate and resource consumption within a constant factor of the optimal bound.
Auteurs: Justin Pearson;João P. Hespanha;Daniel Liberzon;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2286 - 2301
Editeur: IEEE
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» Convergence and State Reconstruction of Time-Varying Multi-Agent Systems From Complete Observability Theory
Résumé:
We study continuous-time consensus dynamics for multi-agent systems with undirected switching interaction graphs. We establish a necessary and sufficient condition for exponential asymptotic consensus based on the classical theory of complete observability. The proof is remarkably simple compared to similar results in the literature and the conditions for consensus are mild. This observability-based method can also be applied to the case where negatively weighted edges are present. Additionally, as a by-product of the observability based arguments, we show that the nodes' initial value can be recovered from the signals on the edges up to a shift of the network average.
Auteurs: Brian D. O. Anderson;Guodong Shi;Jochen Trumpf;
Apparue dans: IEEE Transactions on Automatic Control
Date publication: 05.-2017, volume: 62, issue:5, pages: 2519 - 2523
Editeur: IEEE
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» Convex Space Building Discretization for Ray-Tracing
Résumé:
This paper describes a point-to-multipoint 3-D convex space-based ray-tracing technique. This visibility list is calculated and stored and can be reused as needed. What distinguishes our method is that the visibility list is transmitter location-independent, is a 3-D implementation, and is highly computationally efficient. The division of the building into free and filled convex spaces leads to an efficient Method of Images reflection and diffraction path generation algorithm. This technique can be used to optimize the locations of base transceivers in a highly efficient manner. The first step in producing this tool is the generation of efficient ray-tracing algorithms. The ray-tracing algorithm was specifically designed for later incorporation into a transmitter optimization algorithm. This requires a fast ray-tracing method because of its computationally intensive needs—running multiple times over a point-to-multipoint grid. Our algorithm is executed for sample building environments and then for a real building and compared with measurements to confirm its validity. It is clear that the results are in good agreement but do indicate that a highly accurate spatial modeling of the building is required.
Auteurs: Eamonn M. Kenny;Eamonn O. Nuallain;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2578 - 2591
Editeur: IEEE
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» Cooperative Caching and Transmission Design in Cluster-Centric Small Cell Networks
Résumé:
Wireless content caching in small cell networks (SCNs) has recently been considered as an efficient way to reduce the data traffic and the energy consumption of the backhaul in emerging heterogeneous cellular networks. In this paper, we consider a cluster-centric SCN with combined design of cooperative caching and transmission policy. Small base stations (SBSs) are grouped into disjoint clusters, in which in-cluster cache space is utilized as an entity. We propose a combined caching scheme, where part of the cache space in each cluster is reserved for caching the most popular content in every SBS, while the remaining is used for cooperatively caching different partitions of the less popular content in different SBSs, as a means to increase local content diversity. Depending on the availability and placement of the requested content, coordinated multi-point technique with either joint transmission or parallel transmission is used to deliver content to the served user. Using Poisson point process for the SBS location distribution and a hexagonal grid model for the clusters, we provide analytical results on the successful content delivery probability of both transmission schemes for a user located at the cluster center. Our analysis shows an inherent tradeoff between transmission diversity and content diversity in our cooperation design. We also study the optimal cache space assignment for two objective functions: maximization of the cache service performance and the energy efficiency. Simulation results show that the proposed scheme achieves performance gain by leveraging cache-level and signal-level cooperation and adapting to the network environment and user quality-of-service requirements.
Auteurs: Zheng Chen;Jemin Lee;Tony Q. S. Quek;Marios Kountouris;
Apparue dans: IEEE Transactions on Wireless Communications
Date publication: 05.-2017, volume: 16, issue:5, pages: 3401 - 3415
Editeur: IEEE
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» Cooperative Caching Placement in Cache-Enabled D2D Underlaid Cellular Network
Résumé:
In a cache-enabled D2D underlaid cellular network, cooperation of BS caching and D2D caching can further exploit the limited storage capacity and achieve more efficient wireless resource utilization. In this complex network scenario, the closed form expression for successful transmission probability is firstly derived using stochastic geometry, to measure the proportion of users satisfying the delay guarantee. On this basis, a cooperative caching placement problem is formulated to maximize the successful transmission probability. We prove it can be transformed equivalently into a biconvex problem and then a block coordinate descent based algorithm is proposed. Simulation results demonstrate the performance gain of the proposed cooperative caching placement.
Auteurs: Yue Wang;Xiaofeng Tao;Xuefei Zhang;Yu Gu;
Apparue dans: IEEE Communications Letters
Date publication: 05.-2017, volume: 21, issue:5, pages: 1151 - 1154
Editeur: IEEE
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» Cooperative Source Node Tracking in Non-Line-of-Sight Environments
Résumé:
The accuracy of localization is highly degraded in indoor and harsh environments where source nodes either do not have connections with a sufficient number of anchor nodes due to strong attenuation or have very poor range estimates due to NLOS propagation. Cooperative localization is a technique in which the source nodes communicate not only with the anchor nodes, but also with each other. Hence, the source nodes can collect several additional measurements which significantly improve the localization performance. Although many studies have examined NLOS-degraded localization of a static node in noncooperative networks, and many others have examined the impact of cooperation for static localization, there is no work which considers cooperative tracking of mobile nodes. To address this open problem, in this work, we examine cooperative tracking, particularly in NLOS environments. More specifically, we develop a novel sensor tracking algorithm based on semidefinite programming (SDP) which has the ability to mitigate NLOS propagation. Our simulations show that the new SDP-based tracking algorithm outperforms the classic extended Kalman filter as well as the other recently proposed algorithms for noncooperative tracking in NLOS environments. We also show that the algorithm can be extended to cooperative networks, and that a substantial performance benefit is realized by cooperation.
Auteurs: Reza Monir Vaghefi;R. Michael Buehrer;
Apparue dans: IEEE Transactions on Mobile Computing
Date publication: 05.-2017, volume: 16, issue:5, pages: 1287 - 1299
Editeur: IEEE
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» Coordinated Control of Offshore Wind Farm and Onshore HVDC Converter for Effective Power Oscillation Damping
Résumé:
Damping contribution from wind farms (WFs) is likely to become a mandatory requirement as a part of the grid codes. For remote offshore WFs, connected through a voltage source converter (VSC)-based direct current link, the most convenient option for the onshore transmission system operator (TSO) is to modulate the reactive power at the onshore VSC within their own jurisdiction. In this paper, we show that supplementary control through the onshore VSC alone, although attractive for TSOs, could result in undesirable voltage variations in the onshore grid. On the other hand, modulation of active power output of the wind turbine generators (WTG) alone turns out to be inadequate due to the limited overload capability of the WTGs. Coordinated control over both onshore VSC and aggregated WF output overcomes the above limitations and is shown to be effective for power oscillation damping. A homotopy approach is used to design the coordinated controller, which can be implemented locally (at offshore WF and onshore converter site) using a decentralized architecture. This is a bilinear matrix inequality problem, which is solved by transforming these constraints into linear matrix inequality constraints. Case studies on two test systems show that the proposed controller yields similar system dynamic response as supplementary control through the WF alone.
Auteurs: Yousef Pipelzadeh;Nilanjan Ray Chaudhuri;Balarko Chaudhuri;Tim C. Green;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 1860 - 1872
Editeur: IEEE
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» Correction to “Flux Control Range Broadening and Torque Ripple Minimization of a Double Excitation Synchronous Motor”
Résumé:
In [1], an error in Fig. 2 in Section II-B is corrected. In the original figure, Fig. 2(b) was exactly the same as Fig. 2(a). The correction is shown here.
Auteurs: K. Hoang;L. Vido;M. Gabsi;F. Gillon;
Apparue dans: IEEE Transactions on Magnetics
Date publication: 05.-2017, volume: 53, issue:5, pages: 1 - 1
Editeur: IEEE
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» Corrections to “Impacts of Strategic Bidding of Wind Power Producers on Electricity Markets”
Résumé:
Auteurs: Mohsen Banaei;Majid Oloomi Buygi;Hamidreza Zareipour;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 2489 - 2489
Editeur: IEEE
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» Corrections to “De Novo Annotation of Transposable Elements: Tackling the Fat Genome Issue” [Jamilloux et al., Proc. IEEE, vol. 105, no. 3, pp. 474–481, Mar. 2017, DOI: 10.1109/JPROC.2016.2590833]
Résumé:
In [1], Fig. 1 is inconsistent with the text manuscript. First, the black curve corresponding to case 1 did not correspond to the result from the experiment described in the paper, but to another which was removed from the final manuscript. The second error was a typo with an inversion between the green and blue text indicating NTE50 and LTE50 for cases 4 and 5, respectively. We corrected this figure for the case 1 curve with the right experimental result, and fixed the typo so that it corresponds now perfectly with the manuscript text. Note that this does not affect the text in the manuscript, which remains correct.
Auteurs: Véronique Jamilloux;Josquin Daron;Frédéric Choulet;Hadi Quesneville;
Apparue dans: Proceedings of the IEEE
Date publication: 05.-2017, volume: 105, issue:5, pages: 978 - 978
Editeur: IEEE
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» Corrections to “A 3-D Assembled Silicon-Embedded Transformer for 10-MHz, Ultra-High-Isolation, Compact Chip-to-Chip Power Transfer”
Résumé:
In the above paper [1], the seventh reference “R. Wu, J. K. O. Sin, and S. Y. Hui, ‘A novel silicon-embedded coreless transformer for isolated DC-DC converter application,’ in Proc. IEEE 23rd Int. Symp. Power Semiconductor Devices ICs, Hong Kong, China, May 2015, pp. 297–300, doi: 10.1109/ISPSD.2011.5890863” is incorrect. The correct reference is “R. Wu, N. Liao, X. Fang, and J. K. O. Sin, ‘A novel 3D transformer for ultra-compact signal isolation,’ in Proc. IEEE 27th Int. Symp. Power Semiconductor Devices ICs, Hong Kong, China, May 2015, pp. 297-300, doi: 10.1109/ISPSD.2015.7123448.”
Auteurs: Rongxiang Wu;Niteng Liao;Xiangming Fang;Jian Cai;Qian Wang;Johnny K. O. Sin;
Apparue dans: IEEE Electron Device Letters
Date publication: 05.-2017, volume: 38, issue:5, pages: 689 - 689
Editeur: IEEE
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» Corrections to “Crosstalk-Canceling Multimode Interconnect Using Transmitter Encoding”
Résumé:
The authors of [1] would like to note the following corrections in reference numbering. It is difficult to find correct references in the currently published paper due to the reference discords.
Auteurs: HoonSeok Kim;Chanyoun Won;Paul D. Franzon;
Apparue dans: IEEE Transactions on Very Large Scale Integration Systems
Date publication: 05.-2017, volume: 25, issue:5, pages: 1792 - 1792
Editeur: IEEE
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» Corrections to “Information Without Rolling Dice”
Résumé:
In the paper above [1], published in the March 2017 issue of the IEEE Transactions on Information Theory, the following changes are noted.

In the Abstract, page 1349, left column, line 3, “using square-integrable and bandlimited signals” should be replaced by “using square-integrable, bandlimited signals.”

Auteurs: Taehyung J. Lim;Massimo Franceschetti;
Apparue dans: IEEE Transactions on Information Theory
Date publication: 05.-2017, volume: 63, issue:5, pages: 3332 - 3332
Editeur: IEEE
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» Corrections to “Interconnect Design and Benchmarking for Charge-Based Beyond-CMOS Device Proposals”
Résumé:
In the above-named paper [ibid., vol. 37, no. 4, pp. 508–511, Apr. 2016], a typo was found in equation 3. The corrected equation is provided.
Auteurs: Chenyun Pan;Azad Naeemi;
Apparue dans: IEEE Electron Device Letters
Date publication: 05.-2017, volume: 38, issue:5, pages: 690 - 690
Editeur: IEEE
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» Corrections to “Lower Bounds on Q for Finite Size Antennas of Arbitrary Shape”
Résumé:
Equations (24) and (25) in [1, Appendix B] should, respectively, read as begin{align*}&hspace {-2pc}int nolimits _{V_infty }-(nabla G_{1}) G_{2}^{*} - {hat {boldsymbol {r}}} jkfrac {e^{jk( {boldsymbol {r}}_{1}- {boldsymbol {r}}_{2})cdot {hat {boldsymbol {r}}} }}{16pi ^{2}| {boldsymbol {r}}|^{2}} {dV} =-frac { {boldsymbol {r}}_{12}}{| {boldsymbol {r}}_{12}|}frac {cos (k| {boldsymbol {r}}_{12}|)}{8pi } notag \&-, jfrac {2 {boldsymbol {r}}_{1}}{8pi k^{2}}left ({ frac {sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{3}}-frac {kcos (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{2}} }right )notag \&-, jfrac {| {boldsymbol {r}}_{1}|^{2}-| {boldsymbol {r}}_{2}|^{2}}{8pi k^{2}}frac { {boldsymbol {r}}_{12}}{| {boldsymbol {r}}_{12}|^{2}}notag \× left ({ frac {k^{2}sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|}- 3left ({frac {sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{3}}-frac {kcos (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{2}} }right )}right ) end{align*} and begin{align*}&hspace {-2pc}int nolimits _{V_infty } j(nabla G_{1}) G_{2}^{*} - {hat {boldsymbol {r}}} kfrac {e^{jk( {boldsymbol {r}}_{1}- {boldsymbol {r}}_{2})cdot {hat {boldsymbol {r}}} }}{16pi ^{2}| {boldsymbol {r}}|^{2}} {dV} =jfrac { {boldsymbol {r}}_{12}}{| {boldsymbol {r}}_{12}|}frac {cos (k| {boldsymbol {r}}_{12}|)}{8pi } \&{-} frac { {boldsymbol {r}}_{12}}{8pi k^{2}}left ({ frac {sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{3}}-frac {kcos (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{2}} }right ) \&{-} frac { {boldsymbol {r}}_{1}+ {boldsymbol {r}}_{2}}{8pi k^{2}}left ({ frac {sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{3}}-frac {kcos (k| {boldsymb- l {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{2}} }right ) \&{-} frac {| {boldsymbol {r}}_{1}|^{2}-| {boldsymbol {r}}_{2}|^{2}}{8pi k^{2}}frac { {boldsymbol {r}}_{12}}{| {boldsymbol {r}}_{12}|^{2}} \× left ({ frac {k^{2}sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|}-3left ({frac {sin (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{3}}-frac {kcos (k| {boldsymbol {r}}_{12}|)}{| {boldsymbol {r}}_{12}|^{2}} }right )}right ) \=&jfrac { {boldsymbol {r}}_{12}}{2} text {Re}{G_{12}}-frac {1}{2 k^{2}} text {Im}{nabla _{1} G_{12}} \&{-}frac { {boldsymbol {r}}_{1}+ {boldsymbol {r}}_{2}}{2 k^{2}} text {Im}left {{nabla _{1} G_{12}cdot frac { {boldsymbol {r}}_{12}}{| {boldsymbol {r}}_{12}|^{2}}}right } \&{+}frac {| {boldsymbol {r}}_{1}|^{2}-| {boldsymbol {r}}_{2}|^{2}}{2k^{2}| {boldsymbol {r}}_{12}|^{2}} text {Im}{ {boldsymbol {r}}_{12}k^{2}G_{12}+3nabla _{1} G_{12}}. end{align*}
Auteurs: Oleksiy S. Kim;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2773 - 2773
Editeur: IEEE
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» Cost Optimal Integration of Flexible Buildings in Congested Distribution Grids
Résumé:
Buildings are candidates for providing flexible demand due to their high consumption and inherent thermal inertia. In the future, flexible demand side reserves may also help to relax the expected higher reserve requirements of the grid due to the presence of renewables. However, this flexible demand might be vulnerable to price signals, as the simultaneous increase in consumption by multiple buildings due to low (high) energy (reserves) price periods might cause congestion in distribution grids. In order to integrate congestion-free energy and reserve provision from buildings, this paper presents two benchmark pricing methodologies: (1 ) distribution locational marginal prices (DLMP), and (2) iterative DLMP (iDLMP). Both methods deploy convex optimization to obtain an optimal solution of the original problem. Using dual decomposition, a settlement scheme, which efficiently distributes the congestion cost among involved participants, is also presented. Case studies are performed on a benchmark distribution system along with the National Energy Market Singapore's price framework. The results prove that both methods optimally remove congestion from distribution grids and have potential to be integrated into the theoretical framework of liberalized markets. Furthermore, as a comparison, it is shown that the DLMP-based prices outperforms existing pricing structures of the distribution grid. Hence, using this scheme, the distribution system operator can evaluate existing tariffs and introduce incentives for price responsive demands. However, to support these methods, the high requirement for information sharing in the DLMP method and/or communication technology infrastructure for calculating iDLMPs must exist in the future grid.
Auteurs: Sarmad Hanif;Tobias Massier;Hoay Beng Gooi;Thomas Hamacher;Thomas Reindl;
Apparue dans: IEEE Transactions on Power Systems
Date publication: 05.-2017, volume: 32, issue:3, pages: 2254 - 2266
Editeur: IEEE
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» Cost-Efficient Placement of Communication Connections for Transmission Line Monitoring
Résumé:
For overhead transmission line monitoring, wireless sensor networks offer a low-cost solution to connect sensors on towers with the control center. However, these networks cannot meet stringent quality of service (QoS) requirements, in terms of packet delivery ratio and delay. Also, it is necessary to ensure robustness such that data can be delivered when a tower fails. In view of the QoS and robustness requirements, wide area network (WAN) connections, such as cellular and satellite network are needed, on top of wireless sensor networks. Different WAN connections have different characteristics in terms of availability, performance, and cost. We have proposed a novel scheme, called optimal placement for QoS and robustness (OPQR), which uses the canonical genetic algorithm to determine the numbers, locations, and types of WAN connections to be deployed to minimize cost while satisfying the QoS and robustness requirements. Evaluation results confirm that OPQR can indeed fulfil the desired requirements at minimum cost, and it is a very useful tool in cost-efficient communication network planning for transmission line monitoring. Specifically, OPQR can maintain cost below USD50 per day for a transmission line that has 80 towers spanning across 32 km, while maintaining the packet delay below 100 ms, packet delivery ratio above 99.99%, and each flow has two node-disjoint paths to the control center.
Auteurs: Peng-Yong Kong;Chih-Wen Liu;Joe-Air Jiang;
Apparue dans: IEEE Transactions on Industrial Electronics
Date publication: 05.-2017, volume: 64, issue:5, pages: 4058 - 4067
Editeur: IEEE
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» Cross-Correlated Contrast Source Inversion
Résumé:
In this paper, we improved the performance of the contrast source inversion (CSI) method by incorporating a so-called cross-correlated cost functional, which interrelates the state error and the data error in the measurement domain. The proposed method is referred to as the cross-correlated CSI. It enables better robustness and higher inversion accuracy than both the classical CSI and multiplicative regularized CSI (MR-CSI). In addition, we show how the gradient of the modified cost functional can be calculated without significantly increasing the computational burden. The advantages of the proposed algorithms are demonstrated using a 2-D benchmark problem excited by a transverse magnetic wave as well as a transverse electric wave, respectively, in comparison with classical CSI and MR-CSI.
Auteurs: Shilong Sun;Bert Jan Kooij;Tian Jin;Alexander G. Yarovoy;
Apparue dans: IEEE Transactions on Antennas and Propagation
Date publication: 05.-2017, volume: 65, issue:5, pages: 2592 - 2603
Editeur: IEEE
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» Cross-Network Performance Analysis of Network Coding Aided Cooperative Outband D2D Communications
Résumé:
In long term evolution advanced (LTE-A) networks, the mobile devices can concurrently participate in cooperative outband device-to-device (D2D) data exchange by virtue of user- or network-related parameters (e.g., interest in the same content and cooperative transmissions, respectively). In these scenarios, two major problems arise: 1) the coexistence of multiple devices creates channel access issues, demanding effective medium access control (MAC) schemes, and 2) cellular network factors (i.e., scheduling policy and channel conditions) affect the D2D communication, as the circulating information in D2D links is mainly of cellular network origination, stressing the need for cross network approaches. In this context, the contribution of this paper is threefold. First, exploiting idle devices as relays and the benefits of network coding (NC) in bidirectional communications, we propose an adaptive cooperative NC-based MAC (ACNC-MAC) protocol for the D2D data exchange. Then, we devise a cross-network model that captures the impact of cellular network characteristics on D2D communication. Finally, we evaluate the performance of the ACNC-MAC in terms of throughput, energy efficiency, and battery consumption. Our results show that the LTE-A parameters and the relays’ participation significantly affect the D2D throughput, while the D2D performance deteriorates with the increase of cell congestion.
Auteurs: Eftychia Datsika;Angelos Antonopoulos;Nizar Zorba;Christos Verikoukis;
Apparue dans: IEEE Transactions on Wireless Communications
Date publication: 05.-2017, volume: 16, issue:5, pages: 3176 - 3188
Editeur: IEEE
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» Cross-Scale Cost Aggregation for Stereo Matching
Résumé:
This paper proposes a generic framework that enables a multiscale interaction in the cost aggregation step of stereo matching algorithms. Inspired by the formulation of image filters, we first reformulate cost aggregation from a weighted least-squares (WLS) optimization perspective and show that different cost aggregation methods essentially differ in the choices of similarity kernels. Our key motivation is that while the human stereo vision system processes information at both coarse and fine scales interactively for the correspondence search, state-of-the-art approaches aggregate costs at the finest scale of the input stereo images only, ignoring inter-consistency across multiple scales. This motivation leads us to introduce an inter-scale regularizer into the WLS optimization objective to enforce the consistency of the cost volume among the neighboring scales. The new optimization objective with the inter-scale regularization is convex, and thus, it is easily and analytically solved. Minimizing this new objective leads to the proposed framework. Since the regularization term is independent of the similarity kernel, various cost aggregation approaches, including discrete and continuous parameterization methods, can be easily integrated into the proposed framework. We show that the cross-scale framework is important as it effectively and efficiently expands state-of-the-art cost aggregation methods and leads to significant improvements, when evaluated on Middlebury, Middlebury Third, KITTI, and New Tsukuba data sets.
Auteurs: Kang Zhang;Yuqiang Fang;Dongbo Min;Lifeng Sun;Shiqiang Yang;Shuicheng Yan;
Apparue dans: IEEE Transactions on Circuits and Systems for Video Technology
Date publication: 05.-2017, volume: 27, issue:5, pages: 965 - 976
Editeur: IEEE
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» Crosstalk and Ghost Gratings in a Large-Scale Weak Fiber Bragg Grating Array
Résumé:
Large-scale distributed fiber Bragg grating (FBG) sensor networks have a wide range of applications. However, serious crosstalk could occur in a near-identical serial FBG sensor network because of multiple reflections. Since crosstalk cannot be observed directly and separately from signal, experimental investigation of crosstalk is challenging. In this work, we point out the similarity and symmetry between crosstalk and ghost gratings, and by way of measuring the spectrum of ghost gratings, we experimentally study the characteristics of crosstalk in a serial array of 3010 near-identical FBGs using a commercial FBG sensor interrogation system. We show that ghost gratings drop much more rapidly in power as one goes downstream, and they are more homogeneous in spectral distribution than real gratings. The peak wavelengths of real gratings vary within ±100 pm while the peak wavelengths of the ghost gratings they generate vary within ±20 pm only. Spectral ripples are observed for ghost gratings and real gratings severely affected by crosstalk. These ripples reduce the FBG wavelength reading accuracy to ±5 pm. The work constitutes the first experimental study on crosstalk in large-scale FBG arrays.
Auteurs: Huiyong Guo;Li Qian;Ciming Zhou;Zhou Zheng;Yinquan Yuan;Ruquan Xu;Desheng Jiang;
Apparue dans: Journal of Lightwave Technology
Date publication: 05.-2017, volume: 35, issue:10, pages: 2032 - 2036
Editeur: IEEE
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» Current Status and Opportunities of Organic Thin-Film Transistor Technologies
Résumé:
Attributed to its advantages of super mechanical flexibility, very low-temperature processing, and compatibility with low cost and high throughput manufacturing, organic thin-film transistor (OTFT) technology is able to bring electrical, mechanical, and industrial benefits to a wide range of new applications by activating nonflat surfaces with flexible displays, sensors, and other electronic functions. Despite both strong application demand and these significant technological advances, there is still a gap to be filled for OTFT technology to be widely commercially adopted. This paper provides a comprehensive review of the current status of OTFT technologies ranging from material, device, process, and integration, to design and system applications, and clarifies the real challenges behind to be addressed.
Auteurs: Xiaojun Guo;Yong Xu;Simon Ogier;Tse Nga Ng;Mario Caironi;Andrea Perinot;Ling Li;Jiaqing Zhao;Wei Tang;Radu A. Sporea;Ahmed Nejim;Jordi Carrabina;Paul Cain;Feng Yan;
Apparue dans: IEEE Transactions on Electron Devices
Date publication: 05.-2017, volume: 64, issue:5, pages: 1906 - 1921
Editeur: IEEE
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» Current-Voltage Model for Negative Capacitance Field-Effect Transistors
Résumé:
In this letter, a semi-analytical current–voltage model for a negative capacitance field-effect transistor (NCFET) with a ferroelectric material (i.e., BaTiO3) is proposed. Surface potential ( $psi _{mathrm {S}})$ in the channel region is determined first by solving the Landau–Khalatnikov (LK) equation numerically with Poisson’s equation. Then, the drain–current is achieved based on the current continuity equation using $psi _{mathrm {S}}$ determined earlier. In addition, by introducing a fitting potential for a given drain–voltage, threshold voltage shift can be captured, resulting in accurate surface potential and drain–current at different gate voltages. We have verified our model using the technology computer-aided design (TCAD)-MATLAB simulation, and our model exhibits an excellent agreement to the simulation results. In addition, the impacts of the ferroelectric thickness and channel doping concentration on the device performance and hysteresis window of NCFET are thoroughly explored.
Auteurs: Hyunjae Lee;Youngki Yoon;Changhwan Shin;
Apparue dans: IEEE Electron Device Letters
Date publication: 05.-2017, volume: 38, issue:5, pages: 669 - 672
Editeur: IEEE
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» Custom Multicache Architectures for Heap Manipulating Programs
Résumé:
Memory-intensive implementations often require access to an external, off-chip memory which can substantially slow down an field-programmable gate array accelerator due to memory bandwidth limitations. Buffering frequently reused data on chip is a common approach to address this problem and the optimization of the cache architecture introduces yet another complex design space. This paper presents a high-level synthesis (HLS) design aid that automatically generates parallel multicache systems which are tailored to the specific requirements of the application. Our program analysis identifies nonoverlapping memory regions, supported by private caches, and regions which are shared by parallel units after parallelization, which are supported by coherent caches and synchronization primitives. It also decides whether the parallelization is legal with respect to data dependencies. The novelty of this paper is the focus on programs using dynamically allocated, pointer-based data structures which, while common in software engineering, remain difficult to analyze and are beyond the scope of the overwhelming majority of HLS techniques to date. Second, we devise a high-level cache performance estimation to find a heterogeneous configuration of cache sizes that maximizes the performance of the multicache system subject to an on-chip memory resource constraint. We demonstrate our technique with three case studies of applications using dynamic data structures and use Xilinx Vivado HLS as an exemplary HLS tool. We show up to $boldsymbol {15}boldsymbol {times }$ speed-up after parallelization of the HLS implementations and the insertion of the application-specific distributed hybrid multicache architecture.
Auteurs: Felix Winterstein;Kermin E. Fleming;Hsin-Jung Yang;George A. Constantinides;
Apparue dans: IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Date publication: 05.-2017, volume: 36, issue:5, pages: 761 - 774
Editeur: IEEE
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» Cylindrical Plasmonic Waveguides With Cladding of Hyperbolic Metamaterials
Résumé:
We propose and analyze a new design of cylindrical plasmonic waveguides with the dielectric-coated metal wire as the inner core structure and the hyperbolic metamaterial as the outer cladding. The propagation characteristics of the plasmonic waveguides are analytically solved based on the dispersion relation of a multilayered anisotropic structure in cylindrical coordinates. By using the hyperbolic cladding on the core structure, a sufficiently confined mode area comparable to that of the metal cladding can be attained, while the propagation length is substantially increased. This character is attributed to the strong anisotropy of the hyperbolic cladding that offers an extra degree of freedom to adjust the balance between confinement and loss, leading to a better waveguide performance. A significantly improved figure of merit (the ratio of propagation length to mode size) is achieved for the plasmonic waveguides made of silver and zinc oxide at the telecommunication wavelength.
Auteurs: Ruey-Lin Chern;Ming-Chih Tsai;You-Zhong Yu;
Apparue dans: Journal of Lightwave Technology
Date publication: 05.-2017, volume: 35, issue:10, pages: 1995 - 2002
Editeur: IEEE
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» Cylindrical Polarimetric Phased Array Radar: Beamforming and Calibration for Weather Applications
Résumé:
Future weather radar systems will need to provide rapid updates within a flexible multifunctional overall radar network. This naturally leads to the use of electronically scanned phased array antennas. However, the traditional multifaced planar antenna approaches suffer from having radiation patterns that are variant in both beam shape and polarization as a function of electronic scan angle; even with practically challenging angle-dependent polarization correction, this places limitations on how accurately weather can be measured. A cylindrical array with commutated beams, on the other hand, can theoretically provide patterns that are invariant with respect to azimuth scanning with very pure polarizations. This paper summarizes recent measurements of the cylindrical polarimetric phased array radar demonstrator, a system designed to explore the benefits and limitations of a cylindrical array approach to these future weather radar applications.
Auteurs: Caleb Fulton;Jorge L. Salazar;Yan Zhang;Guifu Zhang;Redmond Kelly;John Meier;Matt McCord;Damon Schmidt;Andrew D. Byrd;Lal Mohan Bhowmik;Shaya Karimkashi;Dusan S. Zrnic;Richard J. Doviak;Allen Zahrai;Mark Yeary;Robert D. Palmer;
Apparue dans: IEEE Transactions on Geoscience and Remote Sensing
Date publication: 05.-2017, volume: 55, issue:5, pages: 2827 - 2841
Editeur: IEEE
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» Damage Modeling of a Low-Noise Amplifier in an RF Front-End Induced by a High Power Electromagnetic Pulse
Résumé:
The RF front-end is a very vulnerable part of the coupling paths that are induced by a high power electromagnetic (HPEM) pulse. Existing studies found through experiment or simulation that low-noise amplifiers (LNAs) often break down or are damaged, which causes the malfunction of the RF front-end. To protect the RF front-end, the damage process of LNAs based on theory is required in detail. This paper summarizes the damage process, and a new library is developed describing the damage phenomenon of LNAs by using user-defined elements. The model can be combined with other circuit models, and can also offer variation of the internal parameters of LNAs by HPEM pulse. Existing physical protection methods have high costs and complexity, and it is difficult to provide perfect protection. Thus, the proposed model can contribute to protection studies utilizing a circuit model.
Auteurs: Ji-Eun Baek;Young-Maan Cho;Kwang-Cheol Ko;
Apparue dans: IEEE Transactions on Plasma Science
Date publication: 05.-2017, volume: 45, issue:5, pages: 798 - 804
Editeur: IEEE
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» Damping Nomogram Method for Small-Signal Security Assessment of Power Systems
Résumé:
This paper reviews the main concepts about power systems security assessment and describes the voltage security assessment (VSA), the transient security assessment (TSA) and the small-signal security assessment (SSA) of electrical power systems. Most methods of SSA are based on the calculation of oscillation modes of power systems and the evaluation of their damping factors. The objective of the power system security assessment is to determine the distance that these systems are to certain security boundary. In small-signal security assessment case, the security limits are, in general, associated to a minimum secure damping factor of the oscillation modes. This paper proposes a nomogram method based on the analysis of oscillation damping factors to be used for small-signal security assessment of power systems and describes its computational development.
Auteurs: Thiago Jose Masseran Antunes Parreiras;Sergio Gomes Junior;Glauco Nery Taranto;
Apparue dans: IEEE Latin America Transactions
Date publication: 05.-2017, volume: 15, issue:5, pages: 877 - 883
Editeur: IEEE
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» Dangers of Distractions [Electrical Safety]
Résumé:
Examines the impact distractions have on industrial electrical safety. Workers and their supervisors are constantly interrupted during their work. If you spend any time at an industrial facility, you know that paging systems and calls on mobile devices are in constant use and make it hard to concentrate. At sites with limited resources, the electrical workers may have other extended responsibilities beyond the job at hand.
Auteurs: Daniel Doan;
Apparue dans: IEEE Industry Applications Magazine
Date publication: 05.-2017, volume: 23, issue:3, pages: 5 - 72
Editeur: IEEE
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