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25th Conference on Winter Simulation, WSC 1993

作者： Dickens, Phillip M. Nicol, David M. Reynolds, Paul F. Duva, John Mark Institute For Computer Applications in Science and Engineering NASA Langley Research Center HamptonVA23681 United States Department of Computer Science College of William and Mary WilliamsburgVA23187 United States Department of Computer Science University of Virginia CharlottesvilleVA22903 United States Department of Applied Mathematics University of Virginia CharlottesvilleVA22903 United States

ISBN: (纸本)078031381X

In this paper we summarize the results of our theoretical investigation into the costs and benefits of extending the conservative simulation window established in a non-aggressive windowing algorithm. There are two primary costs incurred by the non-aggressive algorithm: the cost of global synchronization and the cost of blocking due to pessimistic synchronization constraints. As the conservative simulation window is extended processors are required to synchronize less often and parallelism is increased. However, the increased aggressiveness increases the costs associated with state saving and rollbacks. This is the fundamental trade-off we capture analytically.

关键词： Costs

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Fabrication of microporous polyimide membranes

Fabrication of microporous polyimide membranes

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： T.E. Nelson P.J. Hesketh Microfabrication Applications Laboratory Department of Electrical Engineering & Computer Science University of Illinois Chicago Chicago IL USA

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Numerical study on steady state three-dimensional atmospheric diffusion of sulfur dioxide and sulfate dispersion with non-linear kinetics

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International Journal of Computational Fluid Dynamics 1993年第4期1卷 339-349页

作者： Ponalagusamy, R. Department of Mathematics and Computer Applications Regional Engineering College Tiruchirapalli-620 015 India Department of Computer Science and Engineering Regional Engineering College Tiruchirapalli-625 015 India

The aim of the present work is to study the three dimensional, steady state atmospheric diffusion equation for sulfate with its formation by conversion of sulfur dioxide (SO2) and removal by wet and dry depositions un... 详细信息

The aim of the present work is to study the three dimensional, steady state atmospheric diffusion equation for sulfate with its formation by conversion of sulfur dioxide (SO₂) and removal by wet and dry depositions under the general Michaelis-Menten process. The equations governing the non-linear diffusion process are numerically solved using an alternating direction implicit finite difference scheme. It has been shown that in the case of wet deposition, the percentage decrease in sulfate level is rapid over the range 0 < X < 0.67 (X = dimensionless longitudinal distance) as compared to that of the case of dry deposition. Further, sulfate levels remain higher at ground level for X=1.0 but its levels remain lower at ground level for X = 0.3 and 0.1. Wet removal is found to be more dominant than dry removal in the far off regions of the point source. The fallout of deposits is significant near the source and at the far off lateral distance. © 1993 Taylor … Francis Group, LLC, Taylor & Francis Group, LLC. All rights reserved.

关键词： chemical reaction diffusion and dispersion process non-linear kinetics Numerical investigation

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Advanced link quality analysis for ALE HF radio

Advanced link quality analysis for ALE HF radio

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MILCOM, Military Communications Conference

作者： R.I. Desourdis E. Johnson Science Applications International Corporation Marlborough MA USA Department of Electrical and Computer Engineering New Mexico State University Las Cruces NM USA

The authors describe an approach for measuring the performance of high frequency (HF) links that is currently being evaluated for inclusion in MIL-STD-187-721, the planning standard that provides input for MIL-STD-188-141A. Several proposed advanced link quality analysis (ALQA) techniques for both digital and voice HF links are presented, including both channel quality measures (CQMs) and link performance measures (LPMs). CQMs provide the ALQA process with the HF link performance measurements needed to select operating frequencies or logical channels. These data are generated upon reception of a valid automatic link establishment (ALE) signal and may differ in opposite link directions due to propagation nonreciprocity and differing noise and interference environment. LPMs provide a combined link quality/traffic load measure for HF network node controllers to select optimum message routes.< >

关键词： Hafnium Current measurement Frequency measurement Measurement standards Speech analysis Performance analysis Signal generators Working environment noise Noise generators Interference

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An approach to the direct analysis of transient stability

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European Transactions on Electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, DS LEE, TW FUSCO, VF Microwave Research Group Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH Northern Ireland U.K. D. Stewart McDowall was born in Dublin epublic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Department of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrient programming. He is an Associate Member of the Institute of Electrical Engineers. Lee Thaim Wee was awarded the degree of B. Eng. in Electronics from the Queen's University of Belfast in July 1991. He is currently serving in the Malaysian Armed Forces. Vincent F. Fusco was educated at the Queen's Univeristy of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a reader in Microwave Communications in the School of Electrical Engineering and Computer Science the Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the author of the bookMicrowave Circuits Analysis and Computer Aided Design Prentice-Hall 1987. Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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Stabilizers enhancing the frequency regulation action of HVDC links supplying weak AC systems

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European Transactions on Electrical Power 1993年第3期3卷 201-212页

作者： Maris, T.I. Lygdis, A.D. Vovos, N.A. Giannakopoulos, G.B. Theodoros I. Maris (1961) received the Diploma in Electrical Engineering from the University of Patras/Greece in 1984. In 1985 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras as research assistant where he is currently working for his Ph.D. degree. His area of interest is HVDC transmission. (University of Patras Dep. of Electrical Engineering Power Systems Laboratory GR-26 500 Rion. Patras/Greece T +3061/997350 Fax +3061/997362) Athanassios D. Lygdis (1954) received the Diploma in Electrical Engineering from the University of Patras/Greece in 1979. From 1979 until 1982 he worked at the Nuclear Technology Laboratory of the University of Patras as research assistant. In 1983 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras as scientific collaborator. He is now working for his Ph.D. degree in this Department. His main field of interest is power transmission by HVDC systems. (University of Patras Dep. of Electrical Engineering Power Systems Labora- tory GR-26 500 Rion Patras/Greece T + 3061/997350 Fax + 3061/997361) Nickolas A. Vovos (1951) received the Diploma degree from the University of Patras/Greece the M.Sc. degree from the University of Manchester/England Institute of Science and Technology. and the Ph.D. degree from the University of Patras in 1974 1975 1978 respectively all in Electrical Engineering. In 1976 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras where he is now Associate Professor. His main fields of interest are the modeiling and the transient stability study of integrated AC/DC systems. He is a member of the IEEE Power Engineering Society and CIGRE and a registered professional Engineer and member of the Technical Chamber of Greece (University of Patras Dep. of Electrical Engineering Power Systems laboratory GR-26500 Rion Patras/Greece. T +3061/997369 Fax +3061/997362) Gabriel B. Giannakopoulos (1

Power System Stabilizers (PSS) superimposed to the basic control system of an HVDC link supplying a weak AC system, in order to enhance its frequency regulation action, are proposed. To decrease the AC voltage sensitivity at the inverter side, the basic control system of the HVDC link is proposed to operate with the rectifier under Minimum Ignition Angle (MIA) control and the inverter under Constant Current (CC) control. Inputs to the PSS are the frequency and the AC voltage deviations at the inverter side and their constant parameters are calculated using modal control technique. Detailed simulation results for a practical integrated AC/DC system are presented to evaluate the performance of the proposed control scheme. Copyright © 1993 John Wiley & Sons, Ltd.

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HIGH INDEX PLANE SELECTIVITY OF SILICON ANISOTROPIC ETCHING IN AQUEOUS POTASSIUM HYDROXIDE AND CESIUM HYDROXIDE

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THIN SOLID FILMS 1992年第1期215卷 58-64页

作者： JU, CS HESKETH, PJ Microfabrication Applications Laboratory Department of Electrical Engineering and Computer Science (M/C 154) University of Illinois at Chicago Box 4348 Chicago IL 60680 USA

Mechanically fabricated single-crystal silicon spheres with diameters of 0.25 in were etched in 40 wt.% aqueous potassium hydroxide at 75-degrees-C and 50 wt.% aqueous cesium hydroxide at 50-degrees-C. The post-etching shapes of both etched spheres show that the [111] and [100] directions were the slowest etching directions in both cases. The characteristic structures formed on the surface of these etched spheres were examined under the scanning electron microscope to study the high index plane selectivity. The [311] directions were found to be the most significant among the higher order crystal planes in both cases. Directions close to [023] were concluded to be the fastest etching in aqueous KOH;however, the [110] directions were the fastest in aqueous CsOH.

关键词： Silicon

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MEASUREMENTS OF THE ANISOTROPIC ETCHING OF A SINGLE-CRYSTAL SILICON SPHERE IN AQUEOUS CESIUM HYDROXIDE

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SENSORS AND ACTUATORS A-PHYSICAL 1992年第3期33卷 191-196页

作者： JU, CS HESKETH, PJ Microfabrication Applications Laboratory University of Illinois at Chicago Department of Electrical Engineering and Computer Science (M/C 154) Box 4348 Chicago IL 60680 USA

A mechanically polished single-crystalline silicon sphere with a diameter of 0.25 in is etched in 40% cesium hydroxide solution to study the orientation dependence of the anisotropic etching of silicon in three dimensions. The characteristic structures formed on the surface of the sphere after etching are examined under the scanning electron microscope. The slow-etching planes, {111} and {100}, as well as fast-etching planes, {110}, are identified from the micrographs. Most importantly, the {311} planes are found to be the most significant amongst the higher-order crystal planes.

关键词： Etching

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A computer MODEL OF DERIVATIVE METHOD FOR POINT SOURCE GRAVITY WAVES IN ATMOSPHERE

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science China Mathematics 1992年第11期35卷 1374-1387页

作者：庄洪春 CHAO H.LIU MICHAEL C.KELLEY Research Center of Space Science and Applications Academia Sinica Beljing 100080 PRC Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign USA School of Electrical Engineering Cornell University Ithaca NY USA

Analytical Solutions of point source gravity wave s in an isothermal atmosphere are given.A computer model based on the analytical solutions is developed for point source gravity waves in a horizontally and isothermally stratified *** numerical calculation of the propagation of point source gravity waves in a tealistic atmosphere then becomes feasible. The propagation of point source acoustic waves in the atmosphere can also be numerically calculated using the same model.

关键词： atmospheric gravity waves atmospheric waves acoustic-gravity waves.

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