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IEEE International Symposium on Biomedical Imaging

作者： Haifeng Wang Dong Liang Kevin F. King Leslie Ying Department of Electrical Engineering and Computer Science University of Wisconsin Milwaukee Milwaukee WI USA Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen Guangdong China Global Applied Science Laboratory GE Healthcare Systems Waukesha WI USA

Compressed sensing (CS) has been successfully applied to accelerate conventional magnetic resonance imaging (MRI) with Fourier encoding. However in Fourier encoding, the low spatial frequency always has to be fully sampled such that the high frequency is insufficiently sampled at high accelerations, leading to serious loss of resolution. Non-Fourier encoding has been studied in the context of compressed sensing for 2-D imaging, but with limited improvement. In this paper, we propose a novel 3-D acquisition method using hybrid encoding. The method exploits random encoding with a circulant structure along the “phase encoding” direction, while keeping conventional Fourier encoding along the readout and slice encoding directions. A 2-D random undersampling pattern is used for accelerating the scans. Both simulation and experimental results demonstrate that the proposed method preserves much better resolution than the conventional 3-D Fourier encoding when the same acceleration factors are used.

关键词： Encoding Compressed sensing Magnetic resonance imaging Image reconstruction Acceleration Image coding

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Overcoming Occlusions in Eye-in-Hand Visual Search

Overcoming Occlusions in Eye-in-Hand Visual Search

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American Control Conference

作者： Sina Radmard David Meger Elizabeth A. Croft James J. Little Collaborative Advanced Robotics and Intelligent Systems Laboratory Mechanical Engineering Department University of British Columbia V6T1Z4 Canada Laboratory for Computational Intelligence Department of Computer Science University of British Columbia V6T1Z4 Canada

ISBN: (纸本)9781457710957

In this paper we propose a method for handling persistent visual occlusions that disrupt visual tracking for eye-in-hand systems. This approach provides an efficient strategy for the robot to "look behind" the occlusion while respecting the robot's physical constraints. Specifically, we propose a decoupled search strategy combining a naive pan tilt search with a sensor placement approach, to reduce the strategy's computational cost. We proceed by mapping limited environmental data into the robot configuration space and then planning within a constrained region. We use a particle filter to continuously estimate the target location, while our configuration-based cost function plans a goal location for the camera frame, taking into account robot singularity, self-collision and joint limit constraints. To validate our algorithm, we implemented it on an eye-in-hand robot system. Experimental results for various situations support the feasibility of our approach for quickly recovering fully occluded moving targets. Finally we discuss the implications of this approach to mobile robot platforms.

关键词： Joints Cameras Robot vision systems Target tracking Planning

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A kernel approach to compressed sensing parallel MRI

A kernel approach to compressed sensing parallel MRI

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IEEE International Symposium on Biomedical Imaging

作者： Yuchou Chang Kevin F. King Dong Liang Yong Wang Leslie Ying Department of Electrical Engineering and Computer Science University of Wisconsin Milwaukee Milwaukee WI USA Global Applied Science Laboratory GE Healthcare Systems Waukesha WI USA Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China School of Electronic Engineering Xidian University Xi'an China

Compressed sensing (CS) and parallel imaging (PI) have been widely studied for accelerating MRI reconstruction. Furthermore, the serial combination methods of CS and PI have been proposed for even higher speed of reconstruction. However, both reconstructed signals by CS and PI are not as accurate as acquired MR signals, so that errors of CS reconstruction as the first step will be propagated and even amplified to deteriorate PI reconstruction quality in the second step. Based on our previous work - nonlinear GRAPPA (NLGRAPPA), we proposed a novel serial combination of CS and NLGRAPPA (CS-NLGRAPPA) reconstruction. The generalized kernel regression model of NLGRAPPA can remove error effects of inaccurate signal reconstruction by CS. Experimental results using phantom and in vivo data demonstrate that the proposed CS-NLGRAPPA method can significantly improve the reconstruction quality over the existing method and push net reduction factor around 4.

关键词： Decision support systems

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Power Allocation using Vickrey Auction and Sequential First-Price Auction Games for Physical Layer Security in Cognitive Relay Networks

Power Allocation using Vickrey Auction and Sequential First-...

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IEEE International Conference on Communications

作者： Tianyu Wang Lingyang Song Zhu Han Xiang Cheng Bingli Jiao The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Electrical and Computer Engineering Department University of Houston

ISBN: (纸本)9781457720529

We consider a cognitive radio network in which multiple pairs of secondary users (SUs) communicate by a one-way relay node over orthogonal channels with the existence of an eavesdropper close to the destination. The transmit power of the relay needs efficient distribution for maximizing the sum secrecy rate of the SU pairs, meanwhile satisfying the interference constraint at the single primary user (PU). Specifically, we introduce two multi-object auctions, i.e. the Vickrey auction and the sequential first-price auction, to perform this power allocation problem. We prove the existence and give the general form of the only equilibrium for each auction. We also propose two algorithms based on the equilibriums, respectively. From the simulation results, we see that the system secrecy rate curve of the Vickrey auction gradually coincides with that of the optimal allocation with increasing power units, while the sequential first-price auction reflects more fairness.

关键词： Relay networks power splitting Transmitter power Physical layer Interference constraints Privacy Sequential Cognitive radio optimal allocation Game theory relay

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On effective TSV repair for 3D-stacked ICs 12

On effective TSV repair for 3D-stacked ICs

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Design, Automation and Test in Europe Conference and Exhibition

作者： Li Jiang Qiang Xu Bill Eklow CUhk REliable Computing Laboratory (CURE) Department of Computer Science & Engineering The Chinese University of Hong Kong Shatin New Territories Hong Kong China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China Cisco Systems San Jose CA USA

ISBN: (纸本)9783981080186

3D-stacked ICs that employ through-silicon vias (TSVs) to connect multiple dies vertically have gained wide-spread interest in the semiconductor industry. In order to be commercially viable, the assembly yield for 3D-stacked ICs must be as high as possible, requiring TSVs to be reparable. Existing techniques typically assume TSV faults to be uniformly distributed and use neighboring TSVs to repair faulty ones, if any. In practice, however, clustered TSV faults are quite common due to the fact that the TSV bonding quality depends on surface roughness and cleaness of silicon dies, rendering prior TSV redundancy solutions less effective. To resolve this problem, we present a novel TSV repair framework, including a hardware architecture that enables faulty TSVs to be repaired by redundant TSVs that are farther apart, and the corresponding repair algorithm. By doing so, the manufacturing yield for 3D-stacked ICs can be dramatically improved, as demonstrated in our experimental results.

关键词： Through-silicon vias Maintenance engineering Redundancy Circuit faults Joining processes Timing Clustering algorithms

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Capacity Value of Solar Power

Capacity Value of Solar Power

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IEEE Power and Energy Society General Meeting

作者： Roisin Duignan Chris J. Dent Andrew Mills Nader Samaan Michael Milligan Andrew Keane Mark O'Malley School of Electrical Electronic and Communications Engineering University College Dublin Ireland School of Engineering and Computer Science Durham University United Kingdom Electricity Markets and Policy Group Lawrence Berkeley National Laboratory U.S. Advanced Power and Energy Systems Group Pacific Northwest National Laboratory U.S. Transmission and Grid Integration Group National Renewable Energy Laboratory U.S.

ISBN: (纸本)9781467327275

Evaluating the capacity value of renewable energy sources can pose significant challenges due to their variable and uncertain nature. In this paper the capacity value of solar power is investigated. Solar capacity value metrics and their associated calculation methodologies are reviewed and several solar capacity studies are summarized. The differences between wind and solar power are examined, the economic importance of solar capacity value is discussed and other assessments and recommendations are presented.

关键词： Index Terms - capacity value power system operation and planning solar power. capacity value Solar power renewable energy sources Renewable energy

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Yield enhancement for 3D-stacked ICs: Recent advances and challenges

Yield enhancement for 3D-stacked ICs: Recent advances and ch...

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Asia and South Pacific Design Automation Conference

作者： Qiang Xu Li Jiang Huiyun Li Bill Eklow CUhk REliable Computing Laboratory (CURE) Department of Computer Science & Engineering Chinese University of Hong Kong Hong Kong China Automotive Electronics Research Center Shenzhen Institutes of Advanced Technologies Chinese Academy of Sciences China Cisco Systems Inc. San Jose CA USA

Three-dimensional (3D) integrated circuits (ICs) that stack multiple dies vertically using through-silicon vias (TSVs) have gained wide interests of the semiconductor industry. The shift towards volume production of 3D-stacked ICs, however, requires their manufacturing yield to be commercially viable. Various techniques have been presented in the literature to address this important problem, including pre-bond testing techniques to tackle the “known good die” problem, TSV redundancy designs to provide defect-tolerance, and wafter/die matching solutions to improve the overall stack yield. In this paper, we survey recent advances in this filed and point out challenges to be resolved in the future.

关键词： Through-silicon vias Three dimensional displays Testing Bonding Redundancy Semiconductor device modeling Maintenance engineering

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Poster abstracts

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Sleep and Biological Rhythms 2016年第1期5卷 A1-A189页

作者： J. Ferrie M. Shipley F. Cappuccio E. Brunner M. Miller M. Kumari M. Marmot A. Coenen J. L. Castillo F. Araya G. Bustamante L. Montecino C. Torres S. Oporto J. Gronli E. Fiske R. Murison B. Bjorvatn E. Sorensen R. Ursin C. M. Portas S. Rajaraman A. Gribok N. Wesensten T. Balkin J. Reifman N. Dursunoglu S. Ozkurt S. Baser O. Delen S. Sarikaya P. Sadler P. Mitchell D. Françon M. Decobert B. Herve A. Richard G. Griebel P. Avenet B. Scatton G. L. Fur D. Eckert A. Jordan A. Wellman S. Smith A. Malhotra D. White D. Bruck I. Thomas A. Kritikos W. Oertel K. Stiasny-Kolster D. Garcia-Borreguero W. Poewe B. Hoegl R. Kohnen E. Schollmayer J. Keffel C. Trenkwalder A. Valle S. Roizenblatt F. Fregni P. Boggio S. Tufik K. Ward L. Robertson L. Palmer P. Eastwood D. Hillman J. Lee S. Mukherjee V. de Padova G. Barbato G. Ficca I. Zilli P. Salzarulo M. Veldi T. Hion V. Vasar M. Kull L. Nowak J. Davis Y. Latzer O. Tzischinsky S. Crowley M. Carskadon M. Anca-Herschkovitsch D. Frey J. Ortega C. Wiseman C. Farley K. Wright A. Campbell A. Neill K. Spiegel R. Leproult E. Tasali N. Scherberg E. van Cauter A. T. Noradina N. A. Karim I. Norlinah A. A. Raymond R. Sahathevan B. Hamidon E. Werth R. Poryazova R. Khatami C. Bassetti R. G. Beran L. Ainley G. Holand J. Duncan H. Kinney B. Davis B. Hood S. Frey C. Schmidt M. Hofstetter P. Peigneux C. Cajochen W.-P. Hu J.-D. Li C. Zhang L. Boehmer J. Siegel Q.-Y. Zhou Y. Sagawa H. Kondo T. Takemura H. Kanayama Y. Kaneko M. Sato T. Kanbayashi Y. Hishikawa T. Shimizu A. Viola L. James L. Schlangen D.-J. Dijk R. Andretic Y.-C. Kim K.-A. Han F. Jones R. Greenspan L. Sanford L. Yang X. Tang K. Dieter E. Uta H. Sven M. Richard N. Oyane S. Pallesen F. Holsten Y. Inoue M. Fujita N. Emura K. Kuroda N. Uchimura A. Johnston J. Astbury G. Kennedy K. Hoedlmoser M. Schabus T. Pecherstorfer S. Moser G. Gruber P. Anderer W. Klimesch N. Naidoo M. Ferber A. Pack D. Neu O. Mairesse G. Hoffmann A. Dris L. Lambrecht P. Linkowski P. Verbanck O. Le Bon N. Matsuura M. Yamao N. Adachi R. Aritomi Y. Komada H. Tanaka S. Shirak University College London London UK University College London London USA Warwick Medical School London UK Warwick Medical School Coventry USA Radboud University Nijmegen Nijmegen Netherlands Department of Neurology University of Chile Santiago Chile Neurology Service Hospital del Salvador Santiago Chile Family Health Center Juan Pablo II Santiago Chile Department of Biomedicine Section on Physiology Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care University of Bergen Bergen Norway Norwegian Competence Center for Sleep Disorders Haukeland University Hospital Bergen Norway Department of Child and Adolescent Psychiatry Haukeland University Hospital Univeristy of Bergen Bergen Norway Department of Biomedicine University of Bergen Bergen Norway US Army Medical Research and Materiel Command Fort Detrick Frederick USA Walter Reed Army Institute of Research Silver Spring USA Department of Behavioral Biology Walter Reed Army Institute of Research Silver Spring USA Faculty Department of Pulmonology Pamukkale University Medical Denizli Turkey University of Ballarat Ballarat Australia Sanofi-Aventis Recherche et Developpement Paris France Brigham and Women’s Hospital Harvard Medical School Boston USA The University of Queensland Adelaide Australia School of Psychology University of Queensland Brisbane Australia The University of Queensland Brisbane Australia Victoria University Melbourne Australia Department of Psychology Victoria University Melbourne Australia School of Psychology Victoria University Melbourne Australia Philips-Universität Marburg Germany Philips-Universitaet-Marburg Marburg Germany Instituto de Investigaciones del Sueno Madrid Spain Universitätsklinik für Neurologie Innsbruck Austria Universitaetsklinik fuer Neurologie Innsbruck Austria IMEREM GmbH Nuernberg Germany Schwarz Pharma AG Monheim Germany

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Compact triplexer in two-dimensional hexagonal lattice photonic crystals

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Chinese Optics Letters 2011年第4期9卷 87-90页

作者：任宏亮马建平温浩覃亚丽吴哲夫胡卫生姜淳金耀辉 College of Information Engineering Zhejiang University of Technology College of Computer Science and Technology Zhejiang University of Technology State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

We design a compact triplexer based on two-dimensional （2D） hexagonal lattice photonic crystals （PCs）. A folded directional coupler （FDC） is introduced in the triplexer beside the point-defect micro-cavities and line-defect waveguides. Because of the reflection feedback of the FDC, high channel drop efficiency can be realized and a compact size with the order of micrometers can be maintained. The proposed device is analyzed using the plane wave expansion method, and its transmission characteristics are calculated using the finite-difference time-domain method. The footprint of the triplexer is about 12 9 μm, and its extinction ratios are less than -20 dB for 1310 nm, approximately -20 dB for 1490 nm, and under -40 dB for 1550 nm, making it a potentially essential device in future fiber-to-the-home networks.

关键词： Crystal lattices Defects Fiber optic networks Finite difference time domain method Multiplexing equipment Optical waveguides Personal communication systems Time domain analysis Two dimensional

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Visualization of signalized intersections in driving simulator and validity of driving behaviors in virtual environments

Advances in Transportation Studies

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Advances in Transportation Studies 2012年第26期 17-28页

作者： Yan, X. Abdel-Aty, M. Guo, D. Radwan, E. MOE Key Laboratory for Transportation Complex Systems Theory and Technology Beijing Jiaotong University Beijing 100044 China Department of Civil and Environmental Engineering University of Central Florida Orlando FL 32816-2450 United States Computer Science Program College of Business Florida Gulf Coast University 10501 FGCU Boulevard South Fort Myers FL 33965-6565 United States Center for Advanced Transportation Systems Simulation University of Central Florida Orlando FL 32816-2450 United States

Visualization of highway traffic environments in virtual reality plays a key role on fidelity of simulation and validity of driving behaviors in driving simulator studies. This paper describes a procedure to replicate a signalized intersection with many complex features into a driving simulator's 3-D databases through building a graphical visual database, constructing a road motion database, and creating simulated traffic. The validity of the visualization was assessed via the comparison of the drivers' speeds in the simulator and the speed data at the real intersection. It was found that both speed data follow normal distributions and have equal means for each intersection approach;however, that the speeds measured in the driving simulator have a larger variability than those measured in the field. The users' subjective evaluation results indicated that 92% subjects could recognize the simulated intersection in the driving simulator experiment. Therefore, the strategy of geo-specific environment modeling would be useful for studying driving behaviors in virtual environments.

关键词： Visualization

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