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Multimode RF sensor for moisture analysis of a high pressure gasket material

AIP Conference Proceedings 2015年第1期1650卷 935-942页

作者： G. Bogdanov J. Wiggins K. Bertagnolli R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute 100 Institute Rd Worcester MA 01609 USA US Synthetic 1260 South 1600 West Orem UT 84058 USA

We have previously reported on a nondestructive moisture analysis technique for gaskets that seal a high-pressure cell in the production of polycrystalline diamond. Moisture content plays a crucial role in the performance of these gaskets. Gasket failure may cause explosive decompression that can damage the press anvils; therefore, testing of gaskets for moisture is desired. Radiofrequency measurements were successfully correlated to moisture content, but were disproportionately sensitive to moisture absorbed from the air relative to that remaining from the drying process. In this paper we attempt to spatially differentiate these two moisture types using a new multimode cavity sensor.

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Detection of correlated components in multivariate Gaussian models

Detection of correlated components in multivariate Gaussian ...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Jun Geng Weiyu Xu Lifeng Lai School of Electronics and Information Engineering Harbin Institute of Technology Harbin China Department of Electrical and Computer Engineering University of Iowa Iowa City IA Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA

In this paper, the problem of detecting correlated components in a p-dimensional Gaussian vector is considered. In the setup considered, s unknown components are correlated with a known covariance structure. Hence, there are equation possible hypotheses for the unknown set of correlated components. Instead of taking a full-vector observation at each time index, in this paper we assume that the observer is capable of observing any subset of components in the vector. With this flexibility in taking observations, the observer is interested in finding the optimal sampling strategy to maximize the error exponent (per sample) of the multi-hypothesis testing problem. We show that, when the correlation of these s components is weak, it is optimal for the observer to take full-vector observations; when the correlation is strong, the strategy of taking full-vector observation is not optimal anymore, and the optimal sampling strategy increases the detection error exponent by 25% at least, compared with the full-vector observation strategy.

关键词： Observers Correlation Indexes Testing Covariance matrices Information theory Conferences

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A Novel TDMA-MAC Protocol for VANET Using Cooperative and Opportunistic Transmissions

A Novel TDMA-MAC Protocol for VANET Using Cooperative and Op...

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IEEE Conference on Vehicular Technology (VTC)

作者： Fei Peng Guoan Zhang Xinming Huang Xiang Ye Min Wu School of Electronics and Information Nantong University Nantong China Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

This paper presents a novel time division multiple access-medium access control (TDMA-MAC) protocol for vehicular ad hoc networks (VANETs), in which both cooperative and opportunistic transmissions are employed for enhanced communications. When vehicle density is low, the idle time slots of a licensed VANET channel are used for cooperative transmission through a relay. When the vehicle density is high, cognitive radio technique is applied to seek additional time slots available on the cognitive channels for opportunistic transmission. Simulation results show that the proposed TDMA-MAC protocol can reduce latency and packet loss rate significantly when compared with the existing protocols.

关键词： Vehicular ad hoc networks Vehicles Relays Packet loss Media Access Protocol

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Preface

Communications and Control Engineering

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Communications and Control engineering 2016年第9783319269757期 vii-xi页

作者： Clark, Andrew Alomair, Basel Bushnell, Linda Poovendran, Radha Department of Electrical and Computer Engineering Worcester Polytechnic Institute WorcesterMA United States King Abdulaziz City for Science and Technology Riyadh Saudi Arabia Department of Electrical Engineering University of Washington SeattleWA United States

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A pilot study assessing ipsilateral vs. contralateral feedback in EMG-force models of the wrist for upper-limb prosthesis control

A pilot study assessing ipsilateral vs. contralateral feedba...

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IEEE Signal Processing in Medicine and Biology Symposium (SPMB)

作者： Edward A. Clancy Chenyun Dai Marek Wartenberg Carlos Martinez-Luna Thane R. Hunt Todd R. Farrell Electrical and Computer Engineering Department and Robotics Engineering Worcester Polytechnic Institute (WPI) Worcester MA USA Liberating Technologies Inc. (LTI) Holliston MA USA

Many advanced EMG-based upper-limb prosthesis control methods require model training in which subjects produce supervised forces/movements. Since unilateral limb-absent subjects cannot produce forces/movements on their affected side, one technique (mirrored bi-lateral training) relates forces/motions produced on the sound side to EMG on the affected side. However, the efforts made by the phantom limb may not fully reflect those of the sound limb. To understand this issue, three able-bodied subjects produced mirrored bi-lateral forces during constant-posture contraction at the wrist. EMG-force models were formed for 1- and 2-degree of freedom tasks and results compared to previous trials in which ipsilateral training had been conducted. We found that contralateral training generally, but not always, produced errors (in percent maximum voluntary contraction) that were 6-56% larger than those found from ipsilateral training. Our results suggest that a substantial portion-but not all-of the errors found in mirrored tasks may be due to contralateral tracking errors. Further study with a larger population is indicated.

关键词： Electromyography Training computers Analytical models Force measurement

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Real-time non-contact infant respiratory monitoring using UWB radar

Real-time non-contact infant respiratory monitoring using UW...

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International Conference on Communication Technology (ICCT)

作者： Xinming Huang Ling Sun Tian Tian Zeyan Huang Edward Clancy School of Electronics and Information Nantong University Nantong China Department of Electrical and Computer Engineering Worcester Polytechnic Institute MA USA

ISBN: (纸本)9781467370066

This paper presents a real-time system that can monitor an infant's respiration and detect apnea when it occurs. For infants, bedside monitoring of respiratory signals using noncontact sensors is desirable at the hospital and for in-home care. Traditional approach employs acoustic sensors which can hardly detect infant breathing due to low SNR. In this paper, a novel method is introduced by using ultra-wideband (UWB) radar that obtains breathing signal from an infant's weak chest vibration. Furthermore, advanced signal processing techniques are proposed to monitor the breathing signal and to detect apnea. Since an infant may move in the crib, a location algorithm is applied periodically to track the current location of the infant's chest. An apnea warning is issued when the respiration is absent for a pre-defined period of time.

关键词： Monitoring Ultra wideband radar Medical services Yttrium Sensors

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Outage avoidance and amelioration using Battery Energy Storage Systems

Outage avoidance and amelioration using Battery Energy Stora...

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2014 Clemson University Power Systems Conference, PSC 2014

作者： Tan, Zhang Cialdea, Stephen Orr, John A. Emanuel, Alexander E. Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA United States

ISBN: (纸本)9781479939602

Planned and unplanned outages on distribution networks may cause major economic loss to the customers, and can result in substantial reparation payments by the utilities. This paper analyzes the use of a Battery Energy Storage System (BESS) to partially or completely avoid these outages. The analysis is conducted with a multi-day high demand scenario where the load demand at peak times exceeds the current capacity of the line. This would result in an outage unless the current from the substation can be reduced. Three basic scenarios representative of different degrees of sophistication of feeder automation were studied: A conventional feeder controlled by one or more reclosing breakers;a modern distribution feeder equipped with a limited number of remote controlled breakers that will disconnect non-vital loads belonging to residential, commercial and industrial customers and a modern distribution feeder equipped with numerous remote controlled breakers that will selectively disconnect commercial, industrial, and residential loads, based on their degree of criticality. This study concluded that the total or partial avoidance of outages by way of BESS usage is feasible;however, the use of 'smart grid' control technology can provide more benefit than BESSs in the scenarios studied. © 2014 IEEE.

关键词： Smart power grids

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Distributed testing against independence with multiple terminals 52

Distributed testing against independence with multiple termi...

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2014 52nd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2014

作者： Zhao, Wenwen Lai, Lifeng Department of Electrical and Computer Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9781479980093

Motivated by distributed learning with big data sets problems, we study a distributed testing against independence problem with multiple terminals. We connect the problem at hand to a source coding with multiple helpers problem, which is open in general. We fully characterize the rate region of the source coding with multiple helpers problem under a certain Markovian condition. Using this rate region characterization, we obtain a single-letter characterization of the optimal error exponent for the type 2 error probability under the type 1 error probability and communication rates constraints. © 2014 IEEE.

关键词： Big data

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A Host Takeover Game Model for Competing Malware

A Host Takeover Game Model for Competing Malware

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IEEE Annual Conference on Decision and Control

作者： Phillip Lee Andrew Clark Basel Alomair Linda Bushnell Radha Poovendran Department of Electrical Engineering University of Washington Seattle WA 98195 USA Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA 01609 USA National Center for Cybersecurity Technology King Abdulaziz City for Science and Technology Riyadh Saudi Arabia

ISBN: (纸本)9781479978878

Malware, or malicious software, degrades the performance of cyber-physical systems by infecting cyber systems and compromising the information exchange between cyber and physical components. Advanced malwares have the ability to modify their code over time to escape detection, while also removing competing malwares from a targeted host. In this paper, we model the interaction of multiple adaptive, competing malwares and a system owner via a resource takeover game known as FlipIt, or a game of "stealthy takeover." We characterize the unique Nash equilibrium of a generalization of FlipIt with an arbitrary number of players. We then prove that, by greedily updating their strategies at each time step using only local information, the malwares will converge to a unique Nash equilibrium. In addition, we derive the optimal mitigation strategy against competing malwares as the solution to a Stackelberg game and develop an efficient algorithm for computing the equilibrium. Our results are demonstrated via a numerical study, in which we analyze the behavior of the malwares prior to convergence to the equilibrium and compare the impact of heterogeneous and homogeneous malwares on the system owner's utility.

关键词： Spyware Nash equilibrium efficient algorithm information exchange Converge Players hosts

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A GPU accelerated virtual scanning confocal microscope

A GPU accelerated virtual scanning confocal microscope

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2014 IEEE High Performance Extreme Computing Conference, HPEC 2014

作者： Kingsley, James Chen, Zhilu Bibeau, Jeffrey Vidali, Luis Huang, Xinming Tuzel, Erkan Department of Physics Worcester Polytechnic Institute United States Department of Electrical and Computer Engineering Worcester Polytechnic Institute United States Department of Biology and Biotechnology Worcester Polytechnic Institute United States

ISBN: (纸本)9781479962334

Fluorescence Recovery After Photobleaching (FRAP) is a commonly used technique for quantifying the movement of small biological systems. To aid in the evaluation of experimentally produced data, we used the parallel processing power offered by Graphics Processing Units (GPUs) to accelerate a computational simulation of the process. We find that the parallel process is significantly faster when implemented on the GPU, and that further speed increases can be accomplished via various optimizations, bringing the speed increase up to a factor of one hundred in some cases. © 2014 IEEE.

关键词： Graphics processing unit

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