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arXiv 2018年

作者： Nazari, Mina Li, Xiaoqing Alibakhshi, Mohammad Amin Yang, Haojie Souza, Kathleen Gillespie, Christopher Gummuluru, Suryaram Reinhard, Björn M. Korolev, Kirill S. Ziegler, Lawrence D. Zhao, Qing Wanunu, Meni Erramilli, Shyamsunder Department of Electrical and Computer Engineering Boston University BostonMA02115 United States Department of Physics Boston University BostonMA02115 United States Department of Chemistry Boston University BostonMA02115 United States Photonics Center Boston University BostonMA02115 United States Bioinformatics Program Boston University BostonMA02115 United States Department of Microbiology Boston University School of Medicine BostonMA02118 United States Department of Physics Northeastern University BostonMA02115 United States Next Generation Bioprocessing MilliporeSigma BedfordMA01730 United States School of Physics Peking University Beijing China Department of Mechanics Southeast University Nanjing China

We report on the detection of inactivation of virus particles using femtosecond laser radiation by measuring the conductance of a solid state nanopore designed for detecting single virus particles. Conventional methods of assaying for viral inactivation based on plaque forming assays require 24-48 hours for bacterial growth. Nanopore conductance measurements provide information on morphological changes at a single virion level. We show that analysis of a time series of nanopore conductance can quantify the detection of inactivation, requiring only a few minutes from collection to analysis. Morphological changes were verified by Dynamic Light Scattering (DLS). Statistical analysis maximizing the information entropy provides a measure of the Log-reduction value. Taken together, our work provides a rapid method for assaying viral inactivation with femtosecond lasers using solid-state nanopores. Copyright © 2018, The Authors. All rights reserved.

关键词： Femtosecond lasers

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A comparison of hybrid beamforming and digital beamforming with low-resolution ADCs for multiple users and imperfect CSI

arXiv

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arXiv 2017年

作者： Roth, Kilian Pirzadeh, Hessam Lee Swindlehurst, A. Nossek, Josef A. Next Generation and Standards Intel Deutschland GmbH Neubiberg85579 Germany Department of Electrical and Computer Engineering Technical University Munich Munich80290 Germany Department of Teleinformatics Engineering Federal University of Ceara Fortaleza60020-180 Brazil Center for Pervasive Communications and Computing University of California IrvineCA92697 United States Institute for Advanced Study Technical University of Munich Munchen80333 Germany

For 5G it will be important to leverage the available millimeter wave spectrum. To achieve an approximately omnidirectional coverage with a similar effective antenna aperture compared to state of the art cellular systems, an antenna array is required at both the mobile and basestation. Due to the large bandwidth and inefficient amplifiers available in CMOS for mmWave, the analog front-end of the receiver with a large number of antennas becomes especially power hungry. Two main solutions exist to reduce the power consumption: hybrid beam forming and digital beam forming with low resolution Analog to Digital Converters (ADCs). In this work we compare the spectral and energy efficiency of both systems under practical system constraints. We consider the effects of channel estimation, transmitter impairments and multiple simultaneous users. Our power consumption model considers components reported in literature at 60 GHz. In contrast to many other works we also consider the correlation of the quantization error, and generalize the modeling of it to non-uniform quantizers and different quantizers at each antenna. The result shows that as the SNR gets larger the ADC resolution achieving the optimal energy efficiency gets also larger. The energy efficiency peaks for 5 bit resolution at high SNR, since due to other limiting factors the achievable rate almost saturates at this resolution. We also show that in the multi-user scenario digital beamforming is in any case more energy efficient than hybrid beamforming. In addition we show that if different ADC resolutions are used we can achieve any desired trade-offs between power consumption and rate close to those achieved with only one ADC resolution. Copyright © 2017, The Authors. All rights reserved.

关键词： Millimeter waves

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Joint Source-Channel Decoding of Polar Codes for Language-Based Sources

Joint Source-Channel Decoding of Polar Codes for Language-Ba...

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IEEE Global Communications Conference

作者： Ying Wang Minghai Qin Krishna R. Narayanan Anxiao (Andrew) Jiang Zvonimir Bandic Department of Electrical and Computer Engineering Texas A&M University Next Generation Platform Technologies Western Digital Research Department of Computer Science and Engineering Texas A&M University

ISBN: (纸本)9781509013296

We propose a joint list decoder and language decoder that exploits the redundancy of language-based sources during polar decoding. By judging the validity of decoded words in the decoded sequence with the help of a dictionary, the polar list decoder constantly detects erroneous paths after the decoding of every few bits. This path-pruning technique based on joint decoding has advantages over stand-alone polar list decoding in that most decoding errors in early stages are corrected. We show that if the language structure can be modeled as erasure correcting outer block codes, the rate of inner polar code can be increased while still guaranteeing a vanishing probability of error. To facilitate practical joint decoding, we first propose a construction of a dynamic dictionary using a trie and show an efficient way to trace the dictionary during decoding. Then we propose a joint decoding scheme for polar codes taking into account both information from the channel and the source. The proposed scheme has the same decoding complexity as the list decoding of polar codes. A list-size adaptive joint decoding is further implemented to largely reduce the decoding complexity. Simulation results show that the joint decoding schemes outperform stand-alone polar codes with CRC-aided successive cancellation list decoding by over 0.6 dB.

关键词： Decoding Dictionaries Redundancy Complexity theory Error analysis Parity check codes Delays

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Soil resistivity study and simulation with finite elements method 16

Soil resistivity study and simulation with finite elements m...

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16th International Conference on Environment and electrical engineering, EEEIC 2016

作者： Pereira, Thiago Martins De Lima, Rodrigo Alves Gomes, Viviane Margarida Gutembergue, Sostenes Alves, Aylton Jose Calixto, Wesley Pacheco Electrical Mechanical and Computer Engineering School EMC Federal University of Goias UFG Brazil Experimental and Technological Research and Study Group NExT Federal Institute of Goias IFG Brazil Program in Electronic Systems and Automation PGEA University of Brasilia UnB Brazil

ISBN: (纸本)9781509023196

This work purpose is to study the influence of concrete buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons and soil electrical behavior was carried out. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest. © 2016 IEEE.

关键词： Finite element method

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Estimation and Measurement of Closed-loop Delays in the Actual WACS of Guizhou Power Grid

Estimation and Measurement of Closed-loop Delays in the Actu...

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IEEE Power and Energy Society General Meeting

作者： Fang Zhang Lin Cheng Xiong Li Min Zeng Yuanzhang Sun Joe H. Chow State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University School of Electrical Engineering Wuhan University Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute

ISBN: (纸本)9781509041695

The characterization of the closed-loop delays in a wide-area control system (WACS) is an important foundation for further research. The method to estimate and measure the closed-loop delay in actual WACSs were proposed in this paper. Then, the closed-loop delays in the actual WACS in Guizhou Power Grid in China were measured and analyzed. Also, the measured delays were used to verify the normal distribution estimation model proposed in previous research. The results indicate that the closed-loop delay in the WACS followed a normal distribution.

关键词： CLOSED LOOP Power grids Gaussian distribution delay WACS

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Abstracts

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JOURNAL OF SPINAL CORD MEDICINE 2021年第SUPPL 1期44卷 S278-S324页

作者： [Anonymous] Department of Medicine Division of Physical Medicine and Rehabilitation University of Toronto Toronto ON CA KITE - Toronto Rehabilitation Institute University Health Network Toronto ON CA Institute for Health Policy Management and Evaluation University of Toronto Toronto ON CA Rehabilitation Sciences Institute University of Toronto Toronto ON CA Institute of Medical Sciences University of Toronto Toronto ON CA. Rehabilitation Sciences Institute University of Toronto ON CA KITE Research Institute-Toronto Rehab-University Health Network Toronto ON CA Physical Therapy Department University of Toronto ON CA Praxis Spinal Cord Institute Vancouver BC Université de Montréal (École de réadaptation) Montreal QC CA Institut de réadaptation Gingras-Linsay-de-Montréal Montreal QC CA Division of Physical Medicine & Rehabilitation Department of Medicine Faculty of Medicine & Dentistry University of Alberta Edmonton AB CA University of Calgary Calgary AB CA Alberta Health Services Centre for Family Medicine Kitchener ON CA McMaster University Department of Family Medicine Hamilton ON CA Dept. of Physical Therapy University of Toronto Toronto ON CA KITE-University Health Network Toronto ON CA Praxis Spinal Cord Institute Vancouver BC CA Center for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS) Quebec City QC CA Dept. of Rehabilitation Laval University Quebec City QC CA Institute of Health Policy Management and Evaluation University of Toronto Toronto ON CA School of Rehabilitation Science University of Saskatchewan Saskatoon SK CA Ontario Neurotrauma Foundation Toronto ON CA Canadian Spinal Research Organization Toronto ON CA CIUSSS du Centre-Sud-de-l ‘Île-de-Montréal (Installation Gingras-Lindsay) Montréal QC CA École de réadaptation Université de Montréal Montréal QC CA First Steps Wellness Centre Regina SK CA Stan Cassidy Centre for Rehabilitation Horizon Health Network Fredericton NB CA Departmen

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A coupled memcapacitor emulator based relaxation oscillator

A coupled memcapacitor emulator based relaxation oscillator

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International Symposium on Circuits and systems

作者： Dongsheng Yu Zhi Zhou Herbert H.C. Iu Tyrone Fernando School of Economic Management Nanjing University of Science and Technology Nanjing China School of Electrical & Computer Engineering Purdue University West Lafayette IN USA Department of Electrical Engineering & Computer Science University of Michigan Ann Arbor MI USA Next Generation and Standards Division of Intel's Communication and Devices Group Hillsboro OR USA School of Electrical and Computer Engineering Purdue University West Lafayette IN USA School of Electrical and Computer Engineering and the Weldon School of Biomedical Engineering Purdue University West Lafayette IN USA

ISBN: (纸本)9781479953424

Tremendous efforts have been put into dissecting the inherent characteristics and potential applications of Memcapacitor (MC), which possesses unique abilities of storing both information and energy [1]. Recently, coupling is disclosed as the third relation beyond series and parallel connections of memristive circuits in [2], of which the mechanical dynamic coupling of MCs is taken into account for illustration purpose. Coupled MCs could provide us more opportunities for developing new electronic devices with unique functions. However, very few works currently focus on the practical implementation of coupled MC emulators and its possible application in electronic circuits. In this letter, a practical emulator of coupled MC is newly proposed and then used for structuring Relaxation Oscillators (ROs), of which the period and duty cycle of output oscillating signal can be purposefully controlled in virtue of the coupling action.

关键词： Couplings Oscillators Voltage control Voltage measurement Electric potential Electronic circuits Operational amplifiers

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Gyroscopes based on surface acoustic waves

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Micro and Nano systems Letters 2015年第1期3卷 1-10页

作者： Oh, Haekwan Lee, Ki Jung Lee, Keekeun Yang, Sang Sik Division of Electrical and computer engineering Ajou University Suwon 443-749 South Korea Next Generation Convergence Sensor Research Center KETI Seongnam 463-816 South Korea

This review gives an overview of the development of surface acoustic wave (SAW) based gyroscopes. Different types of SAW based gyroscope are first presented, which are categorized into standing-wave based or progressive-wave based gyroscopes according to their respective mechanisms. In addition, multi-axis detectable SAW based gyroscopes are also introduced in this review. Different principles, structures, production methods, and control technologies are analyzed. © 2015, Oh et al.;licensee Springer.

关键词： Gyroscope Interference effect Multi-axis detectable gyroscope Progressive wave Standing wave Surface acoustic wave (SAW)

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Atomically-thin femtojoule filamentary memristor

arXiv

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arXiv 2017年

作者： Zhao, Huan Dong, Zhipeng Tian, He DiMarzio, Don Han, Myung-Geun Zhang, Lihua Yan, Xiaodong Liu, Fanxin Shen, Lang Han, Shu-jen Cronin, Steve Wu, Wei Tice, Jesse Guo, Jing Wang, Han Ming Hsieh Department of Electrical Engineering University of Southern California Los AngelesCA90089 United States Department of Electrical and Computer Engineering University of Florida GainesvilleFL32611 United States NG Next Northrop Grumman Aerospace Systems 1 Space Park Redondo BeachCA90278 United States Condensed Matter Physics and Materials Sciences Department Brookhaven National Laboratory UptonNY11973 United States Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY11973 United States Collaborative Innovation Center for Information Technology in Biological and Medical Physics College of Science Zhejiang University of Technology Hangzhou310023 China IBM T. J. Watson Research Center Yorktown HeightsNY10598 United States

The morphology and dimension of the conductive filament formed in a memristive device are strongly influenced by the thickness of its switching medium layer. Aggressive scaling of this active layer thickness is critical towards reducing the operating current, voltage and energy consumption in filamentary type memristors. Previously, the thickness of this filament layer has been limited to above a few nanometers due to processing constraints, making it challenging to further suppress the on-state current and the switching voltage. Here, we study the formation of conductive filaments in a material medium with sub-nanometer thickness, formed through the oxidation of atomically-thin two-dimensional boron nitride. The resulting memristive device exhibits sub-nanometer filamentary switching with sub-pA operation current and femtojoule per bit energy consumption. Furthermore, by confining the filament to the atomic scale, we observe current switching characteristics that are distinct from that in thicker medium due to the profoundly different atomic kinetics. The filament morphology in such an aggressively scaled memristive device is also theoretically explored. These ultra-low energy devices are promising for realizing femtojoule and sub-femtojoule electronic computation, which can be attractive for applications in a wide range of electronics systems that desire ultra-low power operation. Copyright © 2017, The Authors. All rights reserved.

关键词： Memristors

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Soil resistivity study and simulation with finite elements method

Soil resistivity study and simulation with finite elements m...

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IEEE International Conference on Environment and electrical engineering

作者： Thiago Martins Pereira Rodrigo Alves de Lima Viviane Margarida Gomes Sóstenes Gutembergue Aylton José Alves Wesley Pacheco Calixto Electrical Mechanical & Computer Engineering School EMC Federal University of Goias UFG Experimental & Technological Research and Study Group NExT Federal Institute of Goias IFG Program in Electronic Systems and Automation PGEA University of Brasilia UnB

ISBN: (纸本)9781509023219

关键词： Grounding systems finite elements method climate seasonality

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