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Abstracts and Workshops 7th National Spinal Cord Injury Conference November 9-11, 2017 Fallsview Casino Resort Niagara Falls, Ontario, Canada Abstracts

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JOURNAL OF SPINAL CORD MEDICINE 2017年第6期40卷 813-869页

作者： [Anonymous] a NET Team Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. fo Neural Engineering and Therapeutic Team Lyndhurst Centre Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. c Rick Hansen Institute Vancouver BC Canada. ev Rick Hansen Institute Vancouver BC Canada. fc Stan Cassidy Hospital University of New Brunswick Fredericton NB Canada. fd Dalhousie University Halifax NS Canada. e University of Saskatchewan Saskatoon SK Canada. aa University of Calgary Calgary AB Canada. y Dalhousie University Halifax NS Canada. fa Health Sciences Centre Winnipeg MB Canada. fb University of Manitoba Winnipeg MB Canada. h University of Alberta Edmonton AB Canada. i Universite Laval Quebe c City QC Canada. bd Rick Hansen Institute Vancouver BC Canada. fz Clinician Investigator Lyndhurst Centre Toronto Rehabilitation Institute University Health Network and Assistant Professor Department of Medicine Division of Physical Medicine and Rehabilitation University of Toronto. v University of Toront o Toronto ON Canada. n Institute of Biomaterials and Biomedical Engineering University of Toronto Toronto ON Canada. o Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. ga Clinical Scientist Lyndhurst Centre Toronto Rehabilitation Institute University Health Network and Assistant Professor Department of Physical Therapy University of Toronto. dx Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada. fm Lawson Health Research Institute London ON Canada. r Parkwood Institute London ON Canada. bi Parkwood Institute London ON Canada. s University of British Columbia Vancouver BC Canada. t Simon Fraser University Burnaby BC Canada. u DeltaQuest Foundation Concord MA USA. z Institut national d'excellence en santé et en services sociaux (INESSS) Quebec City QC Ca

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Photocathode electron beam sources using GaN and InGaN with NEA surface 10

Photocathode electron beam sources using GaN and InGaN with ...

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Gallium Nitride Materials and Devices X

作者： Nishitani, T. Maekawa, T. Tabuchi, M. Meguro, T. Honda, Y. Amano, H. Synchrotron Radiation Research Center Nagoya Univ. Furo-cho Nagoya Aichi464-8603 Japan Dept. of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya Univ. Furo-cho Nagoya Aichi464-8603 Japan Dept. of Physics Faculty of Science Division II Tokyo Univ. of Science 1-3 Kagurazaka Shinjuku Tokyo162-8601 Japan

ISBN: (纸本)9781628414530

A photocathode electron source using p-type GaN and p-type InGaN semiconductors with a negative electron affinity (NEA) surface has been studied for its ability to maintain an extended NEA state. The key technology of NEA photocathodes is the formation of electric dipoles by atoms on the surface, which makes it possible for photo excited electrons in the conduction band minimum to escape into the vacuum. This means that in order to keep the electron energy spread as small as possible, the excitation photon energy should be tuned to the band gap energy. However, the NEA surface is damaged by the adsorption of residual gas and the back-bombardment of ionized residual gas by photoelectrons. The p-type GaN and InGaN semiconductors were measured a lifetime of quantum yield of excitation energy corresponding to the band gap energy in comparison to the p-type GaAs as the conventional NEA photocathode. Lifetime of NEA-photocathodes using the GaN and InGaN were 21 times and 7.7 times longer respectively than that using the GaAs. © 2015 SPIE.

关键词： III-V semiconductors

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Circuit Implementation of Switchable Pins in Chip Multiprocessor

Circuit Implementation of Switchable Pins in Chip Multiproce...

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IEEE International Symposium on Nanoelectronic and Information Systems (iNIS)

作者： Zhou Zhao Ashok Srivastava Lu Peng Shaoming Chen Saraju Mohanty Division of Electrical and Computer Engineering Louisiana State University Baton Rouge LA U.S.A. Department of Computer Science and Engineering University of North Texas Denton TX U.S.A.

Transistor scaling and voltage scaling promote the development of VLSI chip design and modern portable devices. However, transistor scaling brings dark silicon to chips. Lowering supply voltage also results in many transistors to work in near threshold voltage region in which transistors are very sensitive to voltage variation. The paper analyzes the influence of IR drop in a chip multiprocessor (CMP) architecture. Based on our previous work, we focus on the circuit implementation of the proposed switch able pin in CMP using I/O pads with on-chip low cost control circuit, and to let the microprocessor work in data mode or power mode according to various requirements. Using six of eight traditional data pins in an 8-bit RISC microprocessor as switch able pins, the entire current in power mode can be boosted by 72% compared to normal data mode. For data transmission, relative signal-to-noise ratio (rSNR) are tested and the performance of the DRAM is also discussed.

关键词： Pins Switches Data communication System-on-chip Voltage control Threshold voltage Regulators

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Analysis of electromagnetic wave interactions on graphene sheets using time domain integral equations

Analysis of electromagnetic wave interactions on graphene sh...

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International Review of Progress in Applied Computational Electromagnetics (ACES)

作者： Yifei Shi Ismail E. Uysal Ping Li H. Arda Ulku Hakan Bagci Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Electronics Engineering Gebze Institute of Technology Kocaeli Turkey

A marching on-in-time (MOT) scheme for analyzing transient electromagnetic wave interactions on graphene sheets is described. The proposed scheme discretizes a time domain-resistive boundary condition (TDRBC) enforced on the infinitesimally thin graphene sheet. Time domain samples of the graphene's surface resistivity required by the MOT-TDRBC solver are computed from its frequency domain samples using a fast relaxed vector fitting (FRVF) algorithm. Numerical results, which demonstrate the applicability and accuracy of the proposed scheme, are presented.

关键词： Graphene Mathematical model Time-domain analysis Conductivity Transient analysis Electromagnetic scattering Integral equations

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Near-field surface plasmons on quasicrystal metasurfaces

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Scientific Reports 2016年第1期6卷 1-9页

作者： Yang, Quanlong Zhang, Xueqian Li, Shaoxian Xu, Quan Singh, Ranjan Liu, Yongmin Li, Yanfeng Kruk, Sergey S. Gu, Jianqiang Han, Jiaguang Zhang, Weili College of Precision Instrument and Optoelectronics Engineering Tianjin University Key Laboratory of Optoelectronics Information and Technology Tianjin 300072 China Cooperative Innovation Center of Terahertz Science Chengdu 610054 China Center for Disruptive Photonic Technologies Division of Physics and Applied Physics Nanyang Technological University 21 Nanyang Link 637371 Singapore Department of Mechanical and Industrial Engineering Northeastern University Boston 02115 MA United States Nonlinear Physics Center Center for Ultrahigh Bandwidth Devices for Optical Systems Research School of Physics and Engineering Canberra 2601 ACT Australia School of Electrical and Computer Engineering Oklahoma State University Stillwater 74078 OK United States

Excitation and manipulation of surface plasmons (SPs) are essential in developing cutting-edge plasmonic devices for medical diagnostics, biochemical spectroscopy and communications. The most common approach involves designing an array of periodic slits or grating apertures that enables coupling of the incident light to the SP modes. In recent years, plasmonic resonances, including extraordinary optical transmission through periodic arrays, quasicrystals and random aperture arrays, have been investigated in the free space. However, most of the studies have been limited to the far field detection of the transmission resonance. Here, we perform near-field measurements of the SPs on quasicrystal metasurfaces. We discover that the reciprocal vector determines the propagation modes of the SPs in the quasicrystal lattice which can be well explained by the quasi-momentum conservation rule. Our findings demonstrate vast potential in developing plasmonic metasurfaces with unique device functionalities that are controlled by the propagation modes of the SPs in quasicrystals. © 2016 The Author(s).

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Buffer Management in Wireless Full-Duplex Systems

Buffer Management in Wireless Full-Duplex Systems

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IEEE International Conference on Wireless and Mobile Computing, Networking and Communications

作者： Nader Bouacida Ahmad Showail Basem Shihada Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology Thuwal Saudi Arabia College of Computer Science and Engineering Taibah University Al Madinah A1 Munawwarah Saudi Arabia

ISBN: (纸本)9781467377027

Wireless full-duplex radios can simultaneously transmit and receive using the same frequency. In theory, this can double the throughput. In fact, there is only little work addressing aspects other than throughput gains in full-duplex systems. Over-buffering in today's networks or the so-called "bufferbloat" phenomenon creates excessive end-to-end delays resulting in network performance degradation. Our analysis shows that full-duplex systems may suffer from high latency caused by bloated buffers. In this paper, we address the problem of buffer management in full-duplex networks by using Wireless Queue Management (WQM), which is an active queue management technique for wireless networks. Our solution is based on Relay Full-Duplex MAC (RFD-MAC), an asynchronous media access control protocol designed for relay full-duplexing. We compare the performance of WQM in full-duplex environment to Drop Tail mechanism over various scenarios. Our solution reduces the end-to-end delay by two orders of magnitude while achieving similar throughput in most of the cases.

关键词： Full-duplex wireless Bufferbloat Relay fullduplex MAC WQM FULL DUPLEX full-duplex system Throughput wireless MAC protocol duplex system rotation management degradation of performance End-to-end delay

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On the performance of dual-hop FSO/RF systems

On the performance of dual-hop FSO/RF systems

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Emna Zedini Hamza Soury Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

Exact closed-form performance metrics for mixed free-space optical/radio frequency (FSO/RF) communication systems are not available in the literature. This paper presents novel results for the performance analysis of a dual-hop FSO/RF transmission system where the FSO link is modeled by the Gamma-Gamma distribution with pointing error impairments and under heterodyne detection, and the RF link experiences the Nakagami-m fading. Using amplify-and-forward fixed gain relaying, new closed form expressions for the outage probability, the moments, the average bit-error-rate, and the ergodic capacity are obtained in terms of the extended generalized bivariate Meijer's G function. Monte Carlo simulations are provided to confirm the accuracy of the newly proposed results.

关键词： Signal to noise ratio Radio frequency Fading channels Bit error rate Probability density function Receivers Relays

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Unified performance analysis of mixed line of sight RF-FSO fixed gain dual-hop transmission systems

Unified performance analysis of mixed line of sight RF-FSO f...

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IEEE Conference on Wireless Communications and Networking

作者： Emna Zedini Imran Shafique Ansari Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

In this work, we carry out a unified performance analysis of a dual-hop amplify-and-forward fixed gain relay system over asymmetric links composed of both radio-frequency (RF) and unified free-space optics (FSO) under the effect of pointing errors. The RF link is modeled by the Nakagami-m fading channel and the FSO link by the Gamma-Gamma fading channel subject to both types of detection techniques (i.e. heterodyne detection and intensity modulation with direct detection (IM/DD)). In particular, we derive new unified closed-form expressions for the cumulative distribution function, the probability density function, the moment generating function, and the moments of the end-to-end signal-to-noise ratio of these systems in terms of the Meijer's G function. Based on these formulas, we offer exact closed-form expressions for the outage probability, the higher-order amount of fading, and the average bit-error rate of a variety of binary modulations in terms of the Meijer's G function. Further, an exact closed-form expression for the end-to-end ergodic capacity for the Nakagami-m-unified FSO relay links is derived in terms of the extended generalized bivariate Meijer's G function. All the given results are verified via computer-based Monte-Carlo simulations.

关键词： Relays Signal to noise ratio Radio frequency Bit error rate Rayleigh channels Probability density function

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Multihop Communications over CSI-Assisted Relay IM/DD FSO Systems with Pointing Errors

Multihop Communications over CSI-Assisted Relay IM/DD FSO Sy...

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International Conference on Communication Workshop

作者： Emna Zedini Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

In this paper, the end-to-end performance of a multihop free-space optical system with amplify-and-forward channel-state-information-assisted relays using intensity modulation with direct detection technique over Gamma-Gamma turbulence fading with pointing error impairments is studied. More specifically, novel closed-form expressions for the moment generating function, the cumulative distribution function, and the probability density function of the end-to-end signal-to-noise ratio (SNR) are derived in terms of the Meijer's G function. Based on these formulas, closed-form bounds for the outage probability, the average bit-error rate (BER) of a variety of modulation schemes, the moments, and the ergodic capacity are presented. Furthermore, by using the asymptotic expansion of the Meijer's G function at high SNR, accurate asymptotic results are introduced for the outage probability, the average BER and the ergodic capacity in terms of simple elementary functions. For the capacity, novel asymptotic results at low and high SNR regimes are also derived through the moments. All the analytical results are verified via computer-based Monte-carlo simulations.

关键词： Free-space optics (FSO) multihop relaying atmospheric turbulence pointing errors outage probability average bit error rate (BER) ergodic capacity

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Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study (vol 2, pg 144, 2021)

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LANCET GLOBAL HEALTH 2021年第4期9卷 E408-E408页

作者： Steinmetz, Jaimie D. Vision and Eye Research Institute Anglia Ruskin University Cambridge United Kingdom Biomedical Informatics Seoul National University Hospital Seoul South Korea Institute for Health Metrics and Evaluation University of Washington Seattle WA United States Department of Health Metrics Sciences School of Medicine University of Washington Seattle WA United States Institute of Health Services Research Yonsei University Seoul South Korea Department of Ophthalmology University of Washington Seattle WA United States Department of Mathematics Imperial College London London United Kingdom WHO Collaborating Centre for Public Health Education and Training Imperial College London London United Kingdom Department of Primary Care and Public Health Imperial College London London United Kingdom School of Population and Global Health University of Melbourne Carlton VIC Australia School of Optometry and Vision Science UNSW Sydney NSW Australia Brien Holden Vision Institute Sydney Australia Department of Ophthalmology University of Adelaide Adelaide SA Australia Department of Parasitology and Mycology Jahrom University of Medical Sciences Jahrom Iran Department of Clinical Sciences University of Sharjah Sharjah United Arab Emirates Ophthalmic Research Center Shahid Beheshti University of Medical Sciences Tehran Iran Department of Ophthalmology Shahid Beheshti University of Medical Sciences Tehran Iran Research Institute for Endocrine Sciences Shahid Beheshti University of Medical Sciences Tehran Iran Ophthalmic Epidemiology Research Center Shahid Beheshti University of Medical Sciences Tehran Iran Health Services Management Department Qazvin University of Medical Sciences Qazvin Iran Department of Systems Populations and Leadership University of Michigan Ann Arbor MI United States Department of Medicine Sofia Ismail Memorial Medical Centre Bogura Bangladesh The Fred Hollows Foundation Sydney NSW Australia Berhan Public Health & Eye Care Consultancy Addis A

Hospital El Salvador: a novel paradigm of intensive care in response to COVID-19 in central America. Lancet Glob Health 2021;9: e241?42?In this Comment, the conflict of interest statement should have included the following: ?By virtue of their roles within a public hospital or the Ministry of Health, MB, LC, WH, and XS are government employees. The findings and conclusions in the Comment are only those of the authors.? This correction has been made as of Feb 26, 2021.

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