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arXiv 2023年

作者： Gracy, Sebin Liu, Ji Başar, Tamer Uribe, César A. The Department of Electrical and Computer Engineering Rice University HoustonTX United States The Department of Electrical and Computer Engineering Stony Brook University Stony BrookNY United States The Coordinated Science Laboratory University of Illinois Urbana-Champaign United States

The paper deals with the analysis of a discrete-time networked competitive bivirus susceptible-infected-susceptible (SIS) model. More specifically, we suppose that virus 1 and virus 2 are circulating in the population and are in competition with each other. We show that the model is strongly monotone, and that, under certain assumptions, it does not admit any periodic orbit. We identify a sufficient condition for exponential convergence to the disease-free equilibrium (DFE). Assuming only virus 1 (resp. virus 2) is alive, we establish a condition for global asymptotic convergence to the single-virus endemic equilibrium of virus 1 (resp. virus 2) - our proof does not rely on the construction of a Lyapunov function. Assuming both virus 1 and virus 2 are alive, we establish a condition which ensures local exponential convergence to the single-virus equilibrium of virus 1 (resp. virus 2). Finally, we provide a sufficient (resp. necessary) condition for the existence of a coexistence equilibrium. Copyright © 2023, The Authors. All rights reserved.

关键词： Viruses

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An energy-efficient leakage-tolerant dynamic circuit technique

An energy-efficient leakage-tolerant dynamic circuit techniq...

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Annual IEEE International ASIC/SOC Conference

作者： Lei Wang R.K. Krishwamurthy K. Soumyanath N.R. Shanbhag Coordinated Science Laboratory Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Microprocessor Research Laboratories Intel Corporation Hillsboro OR USA

ISBN: (纸本)0780365984

Technology scaling reduces device threshold voltages to mitigate speed loss due to scaled supply voltages. This, however, exponentially increases leakage power and adversely affects circuit reliability. In this paper, we investigate the performance degradation in high-leakage digital circuits. It is shown that deep submicron CMOS technologies lead to 60%-70% degradation in noise-immunity due to leakage. Dual-V/sub t/ domino designs mitigate the noise-immunity degradation to 30%-40% but inevitably lead to a loss of 20%-30% in circuit speed. To achieve a better noise-immunity vs. performance trade-off, a new dynamic circuit technique-the boosted-source (BS) technique is proposed. Simulation results of wide fan-in gates designed in the Predictive Berkeley BSIM3v3 0.13 /spl mu/m technology demonstrate 1.6X-3X improvement in noise-immunity at the expense of marginal energy overhead but no loss in delay, as compared with the existing circuit techniques.

关键词： Energy efficiency Circuit noise CMOS technology Degradation Threshold voltage Dynamic voltage scaling Digital circuits Predictive models Circuit simulation Delay

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Comparison of the Framingham Risk Score and Deep Neural Network-Based Coronary Heart Disease Risk Prediction 15th

Comparison of the Framingham Risk Score and Deep Neural Netw...

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15th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2019, held in conjunction with the 12th International Conference on Frontiers of Information Technology, Applications and Tools, FITAT 2019

作者： Amarbayasgalan, Tsatsral Van Huy, Pham Ryu, Keun Ho Database and Bioinformatics Laboratory School of Electrical and Computer Engineering Chungbuk National University Cheongju28644 Korea Republic of Faculty of Information Technology Ton Duc Thang University Ho Chi Minh City700000 Viet Nam Department of Computer Science College of Electrical and Computer Engineering Chungbuk National University Cheongju28644 Korea Republic of

ISBN: (纸本)9789811397134

Coronary heart disease (CHD) is one of the top causes of death globally;if suffering from CHD, long time permanent treatments are required. Furthermore, the early detection of CHD is not easy;doctors diagnose it based on many kinds of clinical tests. Therefore, it is effective to reduce the risks of developing CHD by predicting high-risk people who will suffer from CHD. The Framingham Risk Score (FRS) is a gender-specific algorithm used to estimate at 10-years CHD risk of an individual. However, FRS cannot well estimate risk in populations other than the US population. In this study, we have proposed a deep neural network (DNN);this approach has been compared with the FRS and data mining-based CHD risk prediction models in the Korean population. As a result of our experiment, models using data mining have given higher accuracy than FRS-based prediction. Moreover, the proposed DNN has shown the highest accuracy and area under the curve (AUC) score, 82.67%, and 82.64%, respectively. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Data mining

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On Projected Stochastic Gradient Descent Algorithm with Weighted Averaging for Least Squares Regression

On Projected Stochastic Gradient Descent Algorithm with Weig...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Kobi Cohen Angelia Nedi? R. Srikant Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer-Sheva 84105 Israel Coordinated Science Laboratory University of Illinois at Urbana-Champaign IL 61801

ISBN: (纸本)9781479999897

The problem of least squares regression of a d-dimensional unknown parameter is considered. A stochastic gradient descent based algorithm with weighted iterate-averaging that uses a single pass over the data is studied and its convergence rate is analyzed. We first consider a bounded constraint set of the unknown parameter. Under some standard regularity assumptions, we provide an explicit O(1/k) upper bound on the convergence rate, depending on the variance (due to the additive noise in the measurements) and the size of the constraint set. We show that the variance term dominates the error and decreases with rate 1/k, while the constraint set term decreases with rate log k/k~2. We then compare the asymptotic ratio ρ between the convergence rate of the proposed scheme and the empirical risk minimizer (ERM) as the number of iterations approaches infinity. We show that p ≤ 4 under some mild conditions for all d≥ 1. We further improve the upper bound by showing that p ≤4/3 for the case of d = 1 and unbounded parameter set. Simulation results demonstrate strong performance of the algorithm as compared to existing methods, and coincide with p ≤ 4/3 even for large d in practice.

关键词： Convex optimization projected stochastic gradient descent weighted averaging empirical risk minimizer

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Wave coupling effects in the nonlinear evolution of the beam‐plasma instability

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The Physics of Fluids 1979年第3期22卷 491-506页

作者： A. L. Throop R. R. Parker Research Laboratory of Electronics and Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139

A formalism is presented which has been used to study the nonlinear evolution of the reactive beam‐plasma instability in the presence of wave coupling. Special consideration is given to describing the energy of the unstable mode in deriving the coupled‐mode equations, and this results in a four‐wave model for the interaction. The results show that pump depletion can stabilize the linear instability, and also predict transitional behavior in saturation mechanisms which is observed experimentally.

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A time‐domain integral‐equation solution for linear antennas and scatterers

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Radio science 1973年第8-9期8卷 797-804页

作者： Liu, Tom K. Mei, Kenneth K. Dikewood Corporation Westwood Research Branch Los Angeles California 90024 Electronics Research Laboratory University of California at Berkeley Berkeley California 94720 Department of Electrical Engineering and Computer Science and the Electronics Research Laboratory University of California at Berkeley Berkeley California 94720

The integral equation of Hallen's type is derived in the time domain. The solution of the integral equation is carried out numerically, and the electromagnetic behavior of linear antennas and scatterers under various excitations is presented. The integral equation may be used to obtain time‐domain responses of coupled parallel linear antennas, and scatterers with loads. Combining with the method of characteristics in solving transmission line problems, the integral‐equation formulation is applied to the cases in which antennas and scatterers are connected to transmission lines. Copyright 1973 by the American Geophysical Union.

关键词： Wires Integral equations Time-domain analysis Loaded antennas Mathematical model Surface waves

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Radiometric calibration of reflective bands of landsat 4 thematic mapper using pseudo-invariant site technique

Radiometric calibration of reflective bands of landsat 4 the...

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2008 IEEE International Geoscience and Remote Sensing Symposium - Proceedings

作者： Malla, Rimy Helder, Dennis L. Image Processing Laboratory South Dakota State University SD 57007 United States Electrical Engineering and Computer Science Department South Dakota State University SD 57007 United States

ISBN: (纸本)9781424428083

Historically, for purposes of calibration, the Landsat 4 Thematic Mapper (TM) sensor has relied upon prelaunch calibration data, internal calibration data and very limited post-launch data. Landsat 4 additionally has used Landsat 5 TM cross-calibration data. The availability of one more independent source, commonly called pseudo-invariant sites, can be used to improve the calibration of the sensor. Pseudo-invariant sites are mainly well characterized desert sites exhibiting the properties of high reflectance, high spatial and spectral uniformity, temporal stability and are nearly Lambertian to decrease BRDF and shadow effects. The successful update of the calibration of the Landsat 5 TM sensor using the pseudo-invariant site approach suggested using this approach to calibrate the Landsat 4 TM sensor [1]. The pseudo-invariant sites selected to characterize the Landsat 4 TM sensor are Middle East sites at Path 166, Row 39 and Path 166, Row 40. Previously, calibration attempts have been primarily based only on the internal calibrator (IC) and prelaunch data. The Landsat 5 internal calibrator was found to be unreliable approximately three years after launch. The Landsat 4 IC data also become questionable especially knowing that the internal calibrators for both the instruments were essentially identical. Thus, it is necessary to characterize the system with another independent and reliable source-in this case pseudo-invariant sites. Unfortunately, due to the unavailability of an adequate number of scenes at the site used for Landsat 5, the Middle East site of Path 166, Row 39 and Path 166, Row 40 were selected. A large drawback of these sites is that they are the locations of the First Gulf War in 1991. This negates the assumption that the surface and atmosphere did not change during the study period. To account for the change, radiometric correction was done using the known Landsat 5 gain signature. A correction factor, which is the ratio of the averages of Landsat 5 p

关键词： Landsat

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Design of A 50-kW Medium Frequency Medium Voltage Transformer for 10-kV SiC-Based Dual Active Bridge Converter

Design of A 50-kW Medium Frequency Medium Voltage Transforme...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Gao, Zihan Li, Dingrui Chen, Ruirui Bai, Hua Tolbert, Leon Wang, Fred The University of Tennessee Min H. Kao Department of Electrical Engineering and Computer Science KnoxvilleTN United States Oak Ridge National Laboratory Oak RidgeTN United States

ISBN: (纸本)9798350316445

In this paper, a 50-kW 1-kV/6.25-kV medium voltage dual-active-bridge (DAB) transformer has been designed and tested. The shell-type transformer structure with stacked small cores is selected to integrate the leakage inductance and reduce the eddy current loss. Dry-type insulation with selective shielding is adopted and both winding-to-ground and winding turn-to-turn insulation are considered. The transformer geometry-based design procedure is discussed to achieve high efficiency and power density considering the effect of eddy current loss and insulation constraint. Tests up to the full voltage and power were performed and the DAB transformer achieved 99.66% full-load efficiency and 13.5 kW/L density for the transformer. © 2023 IEEE.

关键词： Dual-active-bridge (DAB) converters medium voltage transformers

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A PDMS interstitial fluid transdermal extraction tool

A PDMS interstitial fluid transdermal extraction tool

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems

作者： Yu, Haixia Roberts, Robert C. Li, Dachao Xu, Kexin Tien, Norman C. State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin China Department of Electrical Engineering and Computer Science Case Western Reserve University Cleveland OH United States

ISBN: (纸本)9781424465439

We present a microfluidic based interstitial fluid (ISF) transdermal extraction tool fabricated from polydimethylsiloxane (PDMS), designed towards the application of continuous glucose monitoring. This device consists of a Venturi Tube for vacuum generation, chambers for the introduction of ISF and normal saline solution, pneumatic valves for fluid control, and interconnected microchannels. Vacuum pressure is used for fluid manipulation and a 92 kPa (absolute pressure) vacuum has been achieved, when 220 kPa external pressure is applied to the Venturi Tube. The normally open pneumatic valves are closed under less than 160 kPa operating pressure. Under the control of pneumatic valves, the demonstration of the normal saline injection, ISF extraction and collection function of the tool using the vacuum generated by the Venturi Tube is presented. ©2010 IEEE.

关键词： Polydimethylsiloxane

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Distributed hypothesis testing with a fusion center: The conditionally dependent case

Distributed hypothesis testing with a fusion center: The con...

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IEEE Conference on Decision and Control

作者： Kien C. Nguyen Tansu Alpcan Tamer Basar The Department of Electrical and Computer Engineering and the Coordinated Science Laboratory University of Illinois Urbana-Champaign Urbana IL USA Deutsche Telekom Research and Development Laboratories Berlin Germany

ISBN: (纸本)9781424431236

The paper deals with decentralized Bayesian detection with M hypotheses, and N sensors making conditionally correlated measurements regarding these hypotheses. Each sensor sends to a fusion center an integer from {0, 1, ..,D - 1}, and the fusion center makes a decision on the actual hypothesis based on the messages it receives from the sensors so as to minimize the average probability of error. Such conditionally dependent scenarios arise in several applications of decentralized detection such as sensor networks and network security. Conditional dependence leads to a non-standard distributed decision problem where threshold based policies (on likelihood ratios) are no longer optimal, which results in a challenging distributed optimization/decision making problem. We show that, in this case, the minimum average probability of error cannot be expressed as a function of the marginal distributions of the sensor messages. Instead, we characterize this probability based on the joint distributions of these messages. We also provide some numerical results for the case where the sensors¿ measurements follow bivariate normal distributions.

关键词： Testing Sensor fusion Sensor phenomena and characterization Bayesian methods Cost function Laboratories Decision making Gaussian distribution computer science education Random variables

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