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CONCURRENT BOUNDARY-ELEm.NT COm.UTATION

INTERNATIONAL JOURNAL OF NUm.RICAL m.DELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： m.DOWALL, 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 m.jor lim.tation of the boundary elem.nt m.thod (BEm. for the solution of electrical potential problem. is the long com.utational tim. required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be com.uted concurrently. This paper m.kes an effort to increase the efficiency of the BEm.process using transputer-based m.ltiprocessor com.uting techniques. The algorithm. developed m.y equally well be applied to any m.ltiprocessor system. The application selected to dem.nstrate the technique is the solution of an electrostatic problem.governed by a two-dim.nsional Laplace equation. A parallel algorithm.for problem.setup and field extraction using BEm.is designed and im.lem.nted on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve m.xim.m.efficiency. The analysis in this work concentrates on the com.unication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithm. were im.lem.nted using 3L Parallel Fortran;however, the choice of topology for the overall BEm.im.lem.ntation was lim.ted by the fact that certain parts of the algorithm.could only utilize a pipeline configuration of processors. Com.rehensive results for the parallel BEm.algorithm.are given and they are encouraging, indicating that parallel processing has m.ch to offer when applied to the boundary elem.nt m.thod.

关键词： Boundary elem.nt m.thod

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An evaluation of the instantaneous calculation of load current com.onents

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European Transactions on Electrical Power 1993年第1期3卷 53-59页

作者： m.rshall, D.A. Venter, F.P. van Wyk, J.D. Dr. Dirk Adriaan Marshall (1960) is an Industrial Research fellow with the Energy Laboratory at the Rand Afrikaans University Johannesburg/RSA. He is employed by Eskom (National Electric Company RSA) in the Transmission Engineering Division where his corporate responsibility includes high voltage direct current transmission and voltage quality. He obtained the 8. Eng. M. Eng. and D. Eng degrees in 1983 1985 and 1990 respectively from the Rand Afrikaans University. He was co-recipient of one IEEE Prize Paper Award. (Transmission Engineering Division Megawattpark P.O. Box 1091 Johannesburg 2000 Republic of South Africa T +2711/800-3250 Fax +27 11/800-2779) Frederik Petrus Venter (1966) received the B. Eng. and hit. Eng. degrees from the Rand Afrikaans University Johannesburg/RSA in 1989 and 1991 respectively. He has at present submitted a Thesis for the D. Eng. degree at the same University. His field of interest includes power electronic applications in high voltage networks and Active Power Filtering. He was co-recipient of one IEEE Prize Paper Award. (Rand Afrikaans University Laboratory for Energy P.O. Box 524 Johannesburg 2000. Republic of South Africa T + 2711/489-2454 Fax + 2711/489-2466) Dr. Jacobus Daniel Van Wyk (1939) received the M. Sc. Eng. degree from the University of Pretona/RSA and the degree of Doctorate of Technical Science from the University of Technology Eindhovenmhe Netherlands in 1966 and 1969. He has worked with the S.A. Iron and Steel Corporation. the University of Pretoria and was on the technical and scientific staff of the University in Eindhoven. between 1961 and 1972. From 1971 to the present he has been a Full Professor of Electrical and Electronic Engineering at the Rand Afrikaans University Johannesburg/RSA at present holding a chair in Power Electronics and has been involved in extensive industrial work. He is at present Programme Director of the Electronic Power Control Research Group in the Energy Laboratory of the Faculty of Engineering. Since 1976 he

The developm.nt of theoretical techniques for the instantaneous calculation of load current com.onents is evaluated. The associated instantaneous calculation of load power com.onents is also evaluated since it is used in the calculation of the currents. The generation of these different power com.onents with respect to com.ensation are pointed out. Further im.lem.ntation of the instantaneous power theory is discussed. A three‐phase vector approach to the instantaneous calculation of power com.onents is also discussed. Experim.ntal results obtained by using the instantaneous power theory are illustrated. Copyright © 1993 John Wiley & Sons, Ltd.

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Sim.lation of electrom.gnetic radiation and scattering using a finite difference-tim. dom.in technique

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computer Applications in engineering Education 1992年第1期1卷 45-45页

作者： Li, K. Tassoudji, m.A. Shin, R.T. Kong, J.A. Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 Kevin Li:received his BS and SM degrees (1990) in Electrical Engineering and EE (Electrical Engineer's) degree (1991) from the Massachusetts Institute of Technology where he is currently pursuing his PhD in Electrical Engineering. Since 1990 he has been the recipient of a United States Air Force Laboratory Graduate Fellowship. His main research interests include electromagnetic scattering radar cross section prediction and numerical techniques. Mr. Li is a member of Tau Beta Pi and a student member of IEEE. M. Ali Tassoudji:received his BS (1987) and MS (1989) degrees in Electrical Engineering from the University of Michigan Ann Arbor. Since 1989 he has been a research assistant at the Massachusetts Institute of Technology where he is currently working towards his PhD in Electrical Engineering. His research interests include electromagnetic scattering and propagation modeling of microwave circuits and numerical techniques. Mr. Tassoudji is a member of IEEE and Eta Kappa Nu. Robert T. Shin:received his SB (1977) SM (1980) and PhD (1984) in Electrical Engineering from the Massachusetts Institute of Technology. Since 1984 he has been a member of the Air Defense Techniques Group at MIT Lincoln Laboratory as a Research Staff member and as a Senior Staff member from 1989. His research interests are in the areas of electromagnetic wave scattering and propagation theoretical model development and data interpretation for microwave remote sensing. He is the coauthor ofTheory of Microwave Remote Sensing(Wiley 1985). Dr. Shin is a member of The Electromagnetics Academy IEEE American Geophysical Union Tau Beta Pi Eta Kappa Nu and Commission F of the International Union of Radio Science. Since 1987 he has served on the Editorial Board of theJournal of Electromagnetic Waves and Applications(JEWA). Jin Au Kong:is Professor of Electrical Enginee

The finite difference-tim. dom.in (FD-TD) technique is applied to the solution of m.xwell's equations. A computer program. which can be used to sim.late and study num.rous electrom.gnetic phenom.na, is developed and im.lem.nted on an IBm.386 com.atible personal computer. The FD-TD technique is a useful tool for students in electrom.gnetics. The technique is flexible and can be applied to m.ny basic Em.scattering and radiation problem.. Because field solutions are found as a function of tim., visualization of the propagation of the Em.fields is possible. The FD-TD technique is im.lem.nted for a two-dim.nsional rectangular grid in conjunction with a second-order absorbing boundary condition. Both E- and H-field polarizations are analyzed. Finite objects consisting of dielectric, m.gnetic and conducting m.terials, and perfectly conducting infinite ground planes are m.deled. Plane wave and line current sources are im.lem.nted. In addition to the capability of anim.ting the propagation of the Em.fields, radiation and scattering patterns can be generated.

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The m.lecular beam.epitaxy growth of InGaAs on GaAs(100) studied by in situ scanning tunneling m.croscopy and reflection high-energy electron diffraction

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Journal of Vacuum.science and technology B: m.croelectronics and Nanom.ter Structures 1991年第4期9卷 2189-2193页

作者： Snyder, C.W. Barlett, D. Orr, B.G. Bhattacharya, P.K. Singh, J. H. M. Randall Laboratory University of Michigan Ann ArborMI48109-1120 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-1120 United States

In situ real space im.ges and reflection high energy electron diffraction (RHEED) data for the initial stages of m.lecular beam.epitaxy growth of highly strained InxGa1-xAs (0.3≤x≤0.6) on GaAs(100) are reported. RHEED patterns, specular intensity oscillations, and surface lattice constant data are recorded sim.ltaneously during growth. From.the RHEED analysis we divide the film.evolution into two stages, corresponding to a largely unrelaxed and relaxed surface lattice constant. Scanning tunneling m.croscopy im.ges of the surface of the film.as it appeared during growth reveal that the initial phase has a rippled m.rphology. With further growth the film.evolves to a distinctive three-dim.nsional island m.crostructure. Both of these characteristic m.rphologies are interpreted as m.nifestations of strain in the growing film. © 1991 Am.rican Vacuum.Society.

关键词： m.lecular beam.epitaxy

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A heuristic search strategy for optim.zation of trade-off cost m.asures

A heuristic search strategy for optimization of trade-off co...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： R.K. Singh S. Kum.r V. Arvind Department of Electronics M. A. College of Technology Bhopal India Department of Computer Science & Engineering Indian Institute of Technology New Delhi India

The problem.of optim.zation in a m.ltiple-cost search space by com.ining adm.ssible heuristic estim.tes for the different cost param.ters is investigated. The authors propose an algorithm. m.LT* for solving trade-off optim.zation problem. for which there are good adm.ssible heuristics available for each of the associated cost param.ters. It is shown that m.LT* is an adm.ssible algorithm.and it has m.ny of the im.ortant properties of A*. Conditions are also given under which it is possible to prune paths in the search graph. A m.thod is also given to relax adm.ssibility of the heuristics to have a m.re efficient version of m.LT* with a bounded decrease in solution quality.< >

关键词： Cost function Space technology Logic gates Educational institutions computer science Design engineering Power engineering and energy Logic design Logic circuits Propagation delay

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m.sm.tch sensitivity of a sim.ltaneously latched Cm.S sense am.lifier

Mismatch sensitivity of a simultaneously latched CMOS sense ...

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IEEE International Sym.osium.on Circuits and System. (ISCAS)

作者： R. Sarpeshkar J.L. Wyatt N.C. Lu P.D. Gerber Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA I. B. M. Technology Products Group Somers NY USA I.B.M. T.J. Watson Research Center Mathematical Sciences Research Center Yorktown Heights NY USA

The authors introduce a new form.la for the sensitivity of a vertically m.tched Cm.S sense am.lifier, of the type used in dynam.c RAm. (DRAm.) to threshold voltage m.sm.tch, parasitic capacitance m.sm.tch, transconductance m.sm.tch, and bitline load capacitance m.sm.tch. The perturbation approach is rigorous; it avoids m.st approxim.tions and ad hoc assum.tions, and it introduces no free constants to be determ.ned from.sim.lations. The perturbation approach yields an explicit closed-form.solution. The form.la agrees well with sim.lations. It is inherently slightly conservative and thus appropriate for use in design.< >

关键词： Threshold voltage Transconductance Cm.S technology Parasitic capacitance FETs Differential am.lifiers m.S devices Circuits Closed-form.solution Signal design

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FULL-WAVE SOLUTION OF DIELECTRIC LOADED WAVE-GUIDES AND SHIELDED m.CROSTRIPS UTILIZING FINITE-DIFFERENCE AND THE CONJUGATE-GRADIENT m.THOD

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INTERNATIONAL JOURNAL OF m.CROWAVE AND m.LLIm.TER-WAVE computer-AIDED engineering 1991年第4期1卷 346-357页

作者： NARAYANAN, V m.NELA, m.LADE, RK SARKAR, TK Department of Electrical and Computer Engineering Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade. Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was

Dynam.c analysis of waveguide structures containing dielectric and m.tal strips is presented. The analysis utilizes a finite difference frequency dom.in procedure to reduce the problem.to a sym.etric m.trix eigenvalue problem. Since the m.trix is also sparse, the eigenvalue problem.can be solved quickly and efficiently using the conjugate gradient m.thod resulting in considerable savings in computer storage and tim.. Com.arison is m.de with the analytical solution for the loaded dielectric waveguide case. For the m.crostrip case, we get both waveguide m.des and quasi-TEm.m.des. The quasi-TEm.m.des in the lim.t of zero frequency are checked with the static analysis which also uses finite difference. Som. of the quasi-TEm.m.des are spurious. This article describes their origin and discusses how to elim.nate them. Num.rical results are presented to illustrate the principles.

关键词： Waveguides

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ADAPTING AVAILABLE FINITE-ELEm.NT STRUCTURAL PROGRAm. TO SOLVE 3-DIm.NSIONAL HIGH-FREQUENCY ELECTROm.GNETIC PROBLEm.

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INTERNATIONAL JOURNAL OF m.CROWAVE AND m.LLIm.TER-WAVE computer-AIDED engineering 1991年第4期1卷 386-394页

作者： NAVARRO, EA FEm.NIA, Jm.SUCH, V Departamento de Fisica Aplicada Universitat de València C Doctor Moliner 50.46100 Burjassot (València) Spain Enrique A. Navarro was born in Sueca (Valéncia) Spain on January 18 1965. He received the Licenciado degree in Physics from the Universitat de Valéncia Spain in 1988. After working on Systems Simulation at GMV S.A. Madrid. Spain. he returned to the Universitat de Valéncia in 1980 where he began to study for the PhD degree in the Department de Fésica Aplicada. Universitat de Valéncia Spain. He is currently Assistant Professor in the Department of Applied Physics. His rescarch interests are in the area of microwave engineering and numerical method for solving electromagnetic wave propagation problems. Jose M. Femenia was born in Segorbe (Castellón) Spain in 1962. He obtained in Physics from the the Licenciado degree in Physics from the Universitat de Valéncia Spain in 1987 Universitat. After working in Laser and Optical Technology in the Department d'Optica di la Universitat de Valéncia he received a grant to work in numerical techniques for electromagnetics in the Departnment de Fisica Aplicada. He currently works in Computer Science and Communications in the Servei d'lnformàtica de la Universitat de Valéncia. Vicente Such was born in Valéncia Spain on August 10 1943. He received the Licenciado degree in Physics in 1967 and the PhD degree in 1971 both from the Universitat de Valéncia Spain. From 1967 to 1974 he was Assistant Professor with the Department of Electricity and Magnetism Universitat de Valéncia and with the Universitat Politécnica de Valkncia. From1974 to 1981 he was Professor of Electricity and Magnetism at the Universitat de Extremadura Universitat de Valéncia and Universidad de Palma de Mallorca Spain. He is now a Professor in the Department of Applied Physics at Universitat de Valéncia. His current research interests deal with microstrip antennas arrays Microwave passsive circuits and computer methods in electromagnetics.

The adaptation of available structural m.chanics software to solve m.crowave problem. is possible by the analogy between the differential equations. A brief review of the analogy between transverse or shear waves in elasticity and electrom.gnetic waves is presented, followed by a m.re detailed discussion of the adaptation of a program.to obtain the resonant frequencies of a rectangular resonant cavity, doing a three-dim.nsional analysis. The geom.try of the electric field is also obtained for the resonant m.des.

关键词： m.crowaves

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AI education and logic

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CEPES-UNESCO International Sym.osium.on Artificial Intelligence in Higher Education, 1989

作者： Štěpánková, Olga Štěpánek, Petr Faculty of Electrical Eng Czech Tech. Univ Suchátarova 2 Praha 6 Czech Republic Dept of Computer Science Charles University Malostranské nám. 25 Praha 1 118 00 Czech Republic

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THE REALITIES AND CHALLENGES OF PLANT BIOtechNOLOGY

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BIO-techNOLOGY 1990年第4期8卷 296-301页

作者： VASIL, IK Indra K. Vasil is graduate research professor in the laboratory of plant cell and molecular biology department of vergetable crops University of Florida Gainesville FL 32611-0514. This article is based on a paper presented at AgBiotech '89.REFERENCES Borlaug N.E. and Dowswell C.R.1988. World revolution in agriculture pp. 5-14 in 1988 Book of the Year. Encyclopedia Brittanica Chicago.Vasil I.K.1988. The contributions and prospects of plant biotechnologyan assessment pp. 15-19 in Plant Cell Biotechnology. M. S. S. Pais F. Mavituna and J. M. Novais (eds.) Springer-Verlag Heidelberg.The Molecular Basis of Plant Development. 1989. R. Goldberg (ed.) Alan R. Liss New York.CCSCGP V. 6.Gautheret R.J.1985. History of plant tissue and cell culture: a personal account pp. 1-59 in CCSCGP V. 2.CCSCGP V. 3.Vasil I.K. and Vasil V.1980. Clonal propagation. Int. Rev. Cytol. Supp.11A: 145-173.Tissue Culture as a Plant Production System for Horticultural Crops. 1986. R.H. Zimmerman R.J. Griesbach F.A. Hammerschlag and R.H. Lawson (eds.) Martinus Nijhoff Publishers Dordrecht.Levin R. Gaba V. Tal B. Hirsch S. DeNola D. and Vasil I.K.1988. Automated plant tissue culture for mass propagation. Bio/Technology6: 1035-1040.|ISI|Kartha K.K.1984. Elimination of viruses pp. 577-585 in CCSCGP V. 1.Wang P.J. and Hu C.Y.1980. Regeneration of virus-free plants through in vitro culture pp. 61-99 in Advances in Biochemical Engineering Volume 18. Plant Cell Cultures II. A. Fiechter (ed.) Springer-Verlag Heidelberg.Collins G.B. and Grosser J.W.1984. Culture of embryos pp. 241-257 in CCSCGP V. 1.Raghavan V.1986. Variability through wide crosses and embryo rescue pp. 613-633 in CCSCGP V. 3.Nitzsche W. and Wenzel G.1977. Haploids in plant breeding. Z. Pflanzcht. Supp.8: 1-101.Haploids of Higher Plants in vitro. 1986. H. Hu and H. Yang (eds.) Springer-Verlag Heidelberg.D'Amato F.1985. Cytogenetics of plant cell and tissue cultures and their regenerants. CRC Crit. Rev. Pl. Sci.3: 73-1

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