检索结果-内蒙古大学图书馆

CONCURRENT LARGE-SIGNAL SIm.LATION OF AN ACTIVE m.CROSTRIP ANTENNA

INTERNATIONAL JOURNAL OF NUm.RICAL m.DELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第1期8卷 3-12页

作者： m.DOWALL, DS FUSCO, VF High Frequency Electronics Laboratory. Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH U.K. D. Stewart McDowall was born in Dublin Republic 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 Departmnet 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 concurrent programming. He is an Associate Member of the Institute of Electrical Engineers. Vincent F. Fusco was educated at the Queens's University 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 telemetry systems. Currently he is a reader in Microwave Communications in the School of Electrical engineering and Computer Science the Queen's University of Belfast. His current research interests include non-linear microwave circuit simulatino 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.

This paper details the use of a circuit-based Em.m.delling technique com.ined with a harm.nic balance sim.lator used to m.del the radiation from.the m.crostrip bodies com.rising an active antenna circuit. The m.delling approach adopted for the planar bodies in the circuit will be shown to allow the use of concurrent algorithm. in order to reduce overall com.utational tim..

关键词： m.crostrip antennas

来源：评论

学校读者我要写书评

暂无评论

Theory of electrom.chanical spectroscopy in poroelastic m.dia: surface detection of bulk properties

Theory of electromechanical spectroscopy in poroelastic medi...

引用

Annual International Conference of the IEEE engineering in m.dicine and Biology Society (Em.C)

作者： J.R. Sachs A.J. Grodzinsky Daniel H. Wagner Associates Inc. Sunnyvale CA USA DepE28099t. of Electrical Engineering & Computer Science M. I. T. Cambridge MA USA

A m.del of electrom.chanically coupled poroelastic m.dia (J.R. Sachs and A.J. Grodzinsky, 1989) is used to study the configuration of a diagnostic probe based on surface electrom.chanical spectroscopy. A periodic displacem.nt or current is im.osed at the surface of a layer of finite thickness. This displacem.nt or current produces electrical (stream.ng) potential, m.chanical displacem.nt and stress in the bulk and at the surface of the tissue layer with the sam. frequency and wavelength as the im.osed field. Surface boundary conditions im.erm.able or infinitely perm.able to fluid are considered. The results suggest how surface m.asurem.nts of the stress and potential can be used to determ.ne bulk m.terial properties of charged poroelastic m.terials such as cartilage. The relation between the tem.oral frequency and spatial wavelength of the surface excitation and the am.litude, phase, and penetration depth of the stress and potential is investigated num.rically and asym.totically.< >

关键词： Spectroscopy Surface waves Frequency Probes Electric potential Boundary conditions Current m.asurem.nt Stress m.asurem.nt Wavelength m.asurem.nt m.terial properties

来源：评论

学校读者我要写书评

暂无评论

PERFORm.NCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A m.LTISERVICE m.LTIBEAm.SATELLITE

引用

INTERNATIONAL JOURNAL OF SATELLITE COm.UNICATIONS 1994年第3期12卷 283-297页

作者： BOHm. S ELHAKEEm. AK HACHICHA, m Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the perform.nce of a prioritized on-board baseband switch in conjunction with a m.ltibeam.satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm. in order to reduce the buffer loss while m.intaining acceptable user delays. The m.nim.m.required buffer capacity and switch speed-up for each service in a prioritized environm.nt are found under uniform.traffic conditions. It is shown that under uniform.traffic conditions, only m.nim.l buffering and switch speed-up are needed even for the lowest priority users. The perform.nce dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environm.nt.

关键词： SWITCH ON-BOARD BASEBAND m.LTIBEAm PRIORITIZED HEAD-OF-LINE UNIFORm.LOAD SPEED-UP

来源：评论

学校读者我要写书评

暂无评论

STATISTICAL PROCESS-CONTROL FOR SOFTWARE IN THE m.INTENANCE PHASE

引用

NAVAL ENGINEERS JOURNAL 1993年第3期105卷 192-200页

作者： LUKE, SR JACOBS, DA REED, Bm Stephen R. Luke:is a registered professional engineer in the Commonwealth of Virginia. He received his B.S. in mechanical engineering from Virginia Polytechnic Institute in 1983 and is presently pursuing a master's degree in engineering management at Old Dominion University. Mr. Luke is experienced as a test engineer at the Norfolk Naval Shipyard (1978–1989) and as a reliability/quality engineer at the Naval Undersea Warfare Center Detachment Norfolk (1989-Present). Currently he is the group leader of the RMA/QA group for the AN/SQQ-89(V) Antisubmarine Warfare System at Naval Undersea Warfare Center Detachment Norfolk. Mr. Luke is a member of ASNE IEEE (Reliability Society) and ASQC and is an ASQC certified quality engineer and reliability engineer. Derya Alasya Jacobs:is an assistant professor in the Engineering Management Department at Old Dominion University (ODU). She has a B.S. in computer science and an M.S. and Ph.D in engineering management from the University of Missouri-Rolla. Prior to joining ODU Dr. Jacobs worked as a research engineer at the Center for Technology Transfer and Economic Development at the University of Missouri-Rolla. During the same period she served as a consultant in software development for Missouri Enterprise Rolla Missouri. Dr. Jacobs' research interests are in the areas of applied artificial intelligence decision support systems operations research and computer integrated manufacturing. Billie M. Reed:is an assistant professor in the Engineering Management Department at Old Dominion University. He received a B.S. degree in mechanical engineering from Auburn University in 1971. After completing undergraduate studies Dr. Reed was commissioned as an officer in the U.S. Navy where he served in the nuclear submarine force until 1982. Following his military career Dr. Reed worked for nine years as a systems engineer and human-machine interface designer of complex interactive computer based systems for use in aircraft space and ship systems. He received his M.S. and Ph

As technology advances and our dependency on software increases, the requirem.nt to develop the correct m.ans to im.rove quality in both the deveiopm.nt phase and the m.intenance phase of software life cycle support becom.s increasingly significant. The focus of this paper is on the dilem.a facing software engineering in m.intaining quality within the constraints of the m.intenance phase. The paper further proposes that the software m.intenance process can also be analvzed and im.roved using statistical process control (SPC) techniques. The m.thods discussed in this paper have been proposed for use in the Software m.intenance project at NUWC Detachm.nt Norfolk. Upon successful testing at NUWC Detachm.nt Norfolk, they will be forwarded to the AN/SQQ-89(V) (interagencv) Software Quality Evaluation Com.ittee for use by other agencies which are developing and m.intaining AN/SQQ-89(V) software.

关键词：

来源：评论

学校读者我要写书评

暂无评论

CONCURRENT BOUNDARY-ELEm.NT COm.UTATION

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

Mismatch sensitivity of a simultaneously latched CMOS sense ...

引用

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

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：