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A Multipath Channel Model for PLC systems based on Nodal Method and Modal Analysis

A Multipath Channel Model for PLC Systems based on Nodal Met...

引用

2007 IEEE International Symposium on Power Line Communications and its Applications (ISPLC 2007)

作者： T. A. Papadopoulos Ch. G. Kaloudas G. K. Papagiannis Power Systems Laboratory Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Greece

One main concern in PLC applications is related to multipath signal transmission and poses certain problems in the prediction of the signal characteristics. In this paper a simple model, suitable for the calculation of the signal voltage and current profiles in cases of multipath PLC channels is proposed. The model is based on the nodal admittance method and can be applied in multiconductor grids, which are decoupled using modal transformations. The model is based on the Transverse Electromagnetic (TEM) assumption. Several test cases are investigated, including different topologies of a power distribution circuit with the random addition of branches of varying lengths. Phase to phase and phase to ground signal injection cases are examined. The results are checked against the corresponding obtained by the well-known Electromagnetic Transients Program (ATP-EMTP), showing very good agreement.

关键词： PLC Channel Modeling Multipath Propagation Modal Analysis Electromagnetic Transients Program

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Design and Implementation of High Power Density Three-Level Parallel Resonant Converter for Capacitor Charger

Design and Implementation of High Power Density Three-Level ...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： H. Sheng W. Shen H. Wang D. Fu Y. Pei X. Yang F. Wang D. Boroyevich F. C. Lee C. W. Tipton Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA U.S. Army Research Laboratory Adelphi MD USA

This paper describes the design and implementation of a prototype 30kW, 200kHz pulsed power supply. A power density greater than 100W/inch3 is achieved with the converter operating at a high ambient temperature of 65 °C, by utilizing various technologies on topology, control, devices, passives, and thermal management, which can help reduce the converter size. The experimental results demonstrate that the converter meets the performance requirements while achieving the high power density.

关键词： Resonance Capacitors Pulsed power supplies Thermal management Prototypes Topology Size control Temperature control Energy management Technology management

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Effects of multiple-bit shift-right operations on complex binary numbers

Effects of multiple-bit shift-right operations on complex bi...

引用

IEEE Southeastcon

作者： Tariq Jamil Usman Ali Department of Electrical and Computer Engineering Sultan Qaboos University Al-Khoudh Oman Laboratory of Signals and Systems L2S CNRS Supélec University of Paris Gif-sur-Yvette France

To represent a given complex number as one-unit binary number, complex binary number system (CBNS) with (-1+j)-base has been proposed in computer arithmetic literature. In this paper, we have investigated the effects on magnitude and sign of the complex number represented in CBNS format after its binary representation has been shifted-right by one, two, three, and four bits. The analysis leads to the conclusion that multiple-bit shift-right operation in CBNS is quite different from the multiple-bit shift-right operation in traditional binary number system.

关键词： Signal processing algorithms Digital arithmetic Laboratories Image converters Digital signal processing Image processing Equations

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Indium phosphide nanowire photoconductors on non-single crystalline silicon-based platform

Indium phosphide nanowire photoconductors on non-single crys...

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2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007

作者： Kobayashi, Nobuhiko P. Logeeswaran, V.J. Li, Xuema Islam, M. Saif Straznicky, Joseph Wang, Shih-Yuan Li, Zhiyong Stanley Williams, R. Baskin School of Engineering University of California Santa Cruz Santa Cruz CA 95064 United States Advanced Studies Laboratories Univ. of California Santa Cruz United States NASA Ames Research Center Moffett Field CA 94035 United States Information and Quantum Systems Laboratory Hewlett-Packard Laboratories Palo Alto CA 94304 United States Department of Electrical and Computer Engineering University of California Davis Davis CA 95616 United States

ISBN: (纸本)1424406080

We describe the fabrication and characterization of photoconductors in which an ensemble of indium phosphide nanoneedles was utilized. DC electrical transport properties of the fabricated photoconductors were characterized under illumination with monochromatic light at 633 nm. This is the first demonstration of III-V compound semiconductor nanometer-scale structures monolithically integrated on non-single crystalline silicon-based materials as an optoelectronic device that can be fabricated by a simple and flexible process not limited by single crystal substrates. © 2007 IEEE.

关键词： Nanowires

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Throughput (bits/sec/Hz) of Capture-Based Random-Access systems with SINR Channel Models

Throughput (bits/sec/Hz) of Capture-Based Random-Access Syst...

引用

IEEE International Symposium on Information Theory

作者： Jeffrey E. Wieselthier Gam D. Nguyen Anthony Ephremides Information Technology Division Naval Research Laboratory Inc. Washington D.C. DC USA Electrical and Computer Engineering Department Institute for Systems Research University of Maryland College Park MD USA

ISBN: (纸本)9781424413973;1424413974

We study power-based capture, under which a transmission is correctly decoded at the destination, even in the presence of other transmissions, if the received signal-to-interference-plus-noise ratio (SINR) exceeds a threshold bges0. Most previous studies have expressed throughput in terms of packets per slot as a function of b. However, since the value of b is a function of parameters such as data rate and the specified value of bit-error rate (BER), it is actually more appropriate to consider throughput in terms of bits per second per Hz at a specified value of BER. In this paper, we address the relationships between the throughput that can be achieved (using a specific modulation scheme and BER criterion) and the threshold value b.

关键词： Throughput Signal to noise ratio Bit error rate Decoding Information technology Laboratories Educational institutions Random variables Physical layer Background noise

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Data Traffic Analysis in Wireless Fusion Network with Multiple Sensors

Data Traffic Analysis in Wireless Fusion Network with Multip...

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50th IEEE International Midwest Symposium on Circuits and systems (MWSCAS'07), vol.3

作者： Jinseok Lee Sangkil Jung Yuntai Kyong Xi Deng Sangjin Hong We-Duke Cho Stony Brook University-SUNY Stony Brook NY USA Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA Department of Electronics Engineering College of Information Technology Ajou University South Korea

In this paper, we consider a wireless fusion sensor network where multiple types of sensors are incorporated in each sensor node. Each sensor node incorporates a RFID reader and a acoustic sensor. The RFID reader senses the proximity of target objects and acoustic sensors detect the objects for position estimations. The object positions estimated by both sensors are compensated by visual sensor to obtain more accurate object coordinates. In this paper, we perform network traffic analysis for the wireless fusion sensor network by using NS-2 simulations under various network scenarios. The analysis includes the feasibility of fusion network, hop-by-hop delay, and end-to-end delay.

关键词： Wireless sensor networks Telecommunication traffic Data analysis Sensor fusion Acoustic sensors Radiofrequency identification Acoustic signal detection Object detection Traffic control Performance analysis

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Passive Sensor Based Dynamic Object Association Method in Wireless Sensor Networks

Passive Sensor Based Dynamic Object Association Method in Wi...

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50th IEEE International Midwest Symposium on Circuits and systems (MWSCAS'07), vol.3

作者： Shung Han Cho Jinseok Lee Xi Deng Sangjin Hong We-Duke Cho Department of Electrical and Computer Engineering Mobile Systems Design Laboratory Stony Brook University-SUNY Stony Brook NY USA Department of Electronics Engineering College of Information Technology Ajou University South Korea Stony Brook Univ.-SUNY Stony Brook Mobile Systems Design Lab. Dept. of Electrical and Computer Engineering Stony Brook University-SUNY NY 11794-2350 USA Dept. of Electronics Engineering College of Information Technology Ajou University South Korea

This paper proposes and presents a novel algorithm for dynamic data association in wireless sensor networks. The sensor node incorporates RFID reader and acoustic sensor where the signals are fused for tracking and associating multiple objects. The RFID tag is used for object identification and acoustic sensor is used for estimating object movement. The threshold based association algorithm is proposed and its performance is analyzed. The association performance under single node coverage and multiple node coverage is evaluated as a function of sampling time and the dynamic behavior. The algorithm minimizes the failed association and provides association recovery.

关键词： Wireless sensor networks Acoustic sensors Radiofrequency identification Signal processing RFID tags Acoustic signal detection Sensor phenomena and characterization Object detection Target tracking Acoustical engineering

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SPECTS O-CDMA field trials using subpicosecond pulses and integrated encoders/decoders across 80.8-km and 150-km links

SPECTS O-CDMA field trials using subpicosecond pulses and in...

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International Conference on Photonics in Switching (PS)

作者： N.K. Fontaine C. Yang R.P. Scott V.J. Hernandez F. Soares R. Broeke K. Perry G. Nowak W. Cong K. Okamoto B.H. Kolner Z. Ding J.P. Heritage S.J.B. Yoo Department of Electrical and Computer Engineering University of California Davis CA USA Department of Applied Science University of California Davis CA USA Key Laboratory for Micro/Nano Technology and System of Liao-ning ProvinceAerospace Systems Design Laboratory Massachusetts Institute of Technology Lexington MA USA

We compare two field demonstrations of SPECTS-OCDMA on an 80.8-km link and 150-km link using integrated, polarization independent arrayed-waveguide grating (AWG)-based encoders/decoders, an ultra-stable optical freque... 详细信息

关键词： Decoding Fiber nonlinear optics Nonlinear optics Optical receivers Frequency Optical pulses Optical pulse shaping Optical modulation Laboratories Polarization mode dispersion

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The Light Load Issue of Coupled Inductor Laptop Voltage Regulators and its solutions

The Light Load Issue of Coupled Inductor Laptop Voltage Regu...

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Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition (APEC 07), vol.3

作者： Yan Dong Julu Sun Ming Xu Fred. C. Lee Milan M. Jovanovic Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Power Electronics Laboratory Delta Products Corporation Research Triangle Park NC USA

This paper illustrates the low light load efficiency issue of a coupled inductor laptop voltage regulator (VR). Solutions to solve this low light load efficiency issue are investigated. Experiments are implemented and the proposed solutions are verified by the experimental results. They are promising solutions for the future of laptop VRs.

关键词： Voltage regulator (VR) Laptop Coupled inductor Light load efficiency

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Optimal Control of Pedestrian Evacuation in a Corridor

Optimal Control of Pedestrian Evacuation in a Corridor

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International Conference on Intelligent Transportation

作者： Apoorva Shende Pushkin Kachroo C. Konda Reddy Mahendra Singh Department of Engineering Science and Mechanics Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Nonlinear Systems Laboratory (NSL) AeroSpace and Ocean Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

The problem of optimal control of pedestrian evacuation from a corridor has been addressed. The corridor has been treated as a one dimensional link in the building network from which the pedestrians have to be evacuated. The governing flow equations are derived from the discretized continuity equation and a flow density relation for the pedestrian flow. Necessary conditions for the optimal control of these differential equations are developed using the calculus of variations method. The necessary conditions constitute a 2 point boundary value problem that has to be solved for the state, the co-state and the optimal control. Method of steepest descent is used to solve this problem. Numerical results are presented in the end for a test case.

关键词： Optimal control Vehicle dynamics Traffic control Microscopy Intelligent transportation systems Differential equations Calculus Testing Routing Buildings

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