检索结果-内蒙古大学图书馆

Dynamic on-line measurement of equivalent parameters of three-phase systems for harmonic frequencies - Reply

EUROPEAN TRANSACTIONS ON electrical POWER 1996年第5期6卷 336-336页

作者： Czarnecki, LS [?]Leszek S. Czarnecki (1939) received the M.Sc. and Ph.D. degrees in electrical engineering and Habil. Dr. degree from the Silesian Technical University Poland in 1963 1969 and 1984 respectively where he was employed as an Assistant Professor. Since 1984 he worked for two years at the Power Engineering Section Division of Electrical Engineering National Research Council of Canada as a Visiting Research Officer. In 1987 he joined the Electrical Engineering Dept. at Zielona Gora Technical University. In 1989 he joined the Electrical and Computer Engineering Dept. of the Louisiana State University (LSU) Baton Rouge NSA. as an Associate Professor. Fordeveloping a power theory of asymmetrical three-phase systems with non-sinusoidal waveforms he was elected to the grade of Fellow IEEE in 1996. His research interests include network analysis and synthesis power flow in non-sinusoidal systems compensation and power-quality improvement in non-sinusoidd unbalanced systems and power electronics. (Electrical and Computer Eng. Louisiana State University Baton Rouge/ USA Louisiana 70803 T + 1504888-5241 Fax + 1504/388-5200 Internet page: http:/***/Cape Canavera U4739)

A method of an on-line measurement of equivalent parameters for harmonic frequencies of a three-phase distribution system with harmonic generating loads is discussed in the paper. The impedances of the supply and the load, the complex RMS (CRMS) values of the load generated current harmonics, and the CRMS values of the distribution voltage harmonics are the subject of the measurement. It is shown that the on-line measurement of these parameters requires that the line voltages and currents are measured at least in three different states of the system. These states of the tested system are changed by disturbing the system with a current harmonics generating device, built in a form of a fast thyristor switch. The method is illustrated with measurements in a physical system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Power theory of electrical circuits with quasi-periodic waveforms of voltages and currents

引用

EUROPEAN TRANSACTIONS ON electrical POWER 1996年第5期6卷 321-328页

作者： Czarnecki, LS [?]Leszek S. Czarnecki (1939) received the M.Sc. and Ph.D. degrees in electrical engineering and Habil. Dr. degree from the Silesian Technical University Poland in 1963 1969 and 1984. respectively. where he was employed as an Assistant Professor. Since 1984 he worked for two years at the Power Engineering Section Division of Electrical Engineering National Research Council of Canada as a Visiting Research Officer. In 1987 he joined the Electrical Engineering Dept. at Zielona Cora Technical University. In 1989 he joined the Electrical and Computer Engineering Dept. of the Louisiana State University (LSU) Baton Rouge NSA as an Associate Professor. For developing a power theory of asymmetrical three-phase systems with non-sinusoidal waveforms he was elected to the grade of Fellow IEEE in 1996. His research interests include network analysis and synthesis power flow in non-sinusoidal systems compensation and power-quality improvement in non-sinusoidal unbalanced systems and power electronics. (Electrical and Computer Eng. Louisiana State University Baton Rougel USA Louisiana70803 T+ I5 0413 88-5241 Fax + I5 W 3 88-52 00 Internet page: http://***/Cape Canaveral/4739)

Generally known current and power equations of electrical circuits cannot be used in situations where the voltage and current waveforms are non-periodic. The paper suggests that these equations could be applied to systems with quasi-periodic waveforms, however, as approximate models of the power-related phenomena. The concepts of the running RMS and complex RMS values, as well as the running active power are introduced for that purpose and applied for generalizing the current and power equations of the single-phase and three-phase circuits with time-variant parameters. Fast iterative algorithms for calculating the running quantities make it possible to integrate the frequency-domain and the time-domain approaches into a kind of the time and frequency-domain model of the power-related phenomena in circuits with quasi-periodic waveforms.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Development of the iPOINT Testbed for Optoelectronic Asynchronous Transfer Mode Networking

Development of the iPOINT Testbed for Optoelectronic Asynchr...

引用

1996 International Conference on Information Infrastructure(ICII’96)

作者： John W Lockwood Sung Mo Kang Stephen G.Bishop Haoran Duan Ashfaq Hossain Visiting Assistant Professor of Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA Department Head of Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA Director of the Center for Compound Semiconductor Microelectronics The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA candidate in Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA candidate in Computer Science The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA

＜正＞Asynchronous Transfer Mode（ATM）technology will be used to build Internet backbones and within local-area networks to interconnect personal computers and workstations running network-intensive *** such as the World Wide Web（WWW）,desktop video conferencing, distributed computing,network file systems,and remote access to supercomputing resources have dramatically increased the demand for bandwidth in current *** networks must scale in bandwidth as the computational power of the desktop computer as well as the number of installed computer systems continues to grow exponentially. The Illinois Pulsar-based Interconnection（iPOINT）testbed has been established to desjgn and develop scalable ATM switch architectures,explore multicast scheduUng algorithms to enable one- to-many data delivery,and investigate new techniques for data queuing,Within this testbed,Field Programmable Gate Array（FPGA）technologies have been used to prototype the core logic of the ATM switch,scheduler,and queue *** coniunction of the UIUC microelectronics laboratory,low-cost optoelectronic components have been developed and inserted into the testbed. As a part of the computer science research,an MPEG/JPEG video server and clint has been developed and operates on this fully functional testbed.

关键词：

来源：评论

学校读者我要写书评

暂无评论

ON CONVEX-OPTIMIZATION WITH LINEAR CONSTRAINTS

引用

JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS 1995年第2期86卷 407-420页

作者： LIN, CY NEKOOIE, B FAN, MKH Graduate Student School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia. Assistant Professor School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia.

In this paper, we propose an interior-point method for minimizing a convex function subject to linear constraints. Our method employs ideas from a previously studied method due to Fan and Nekooie in a different context. Under certain assumptions, we show that the proposed method has a fast rate of convergence. A numerical example is included to illustrate the method.

关键词： CONVEX OPTIMIZATION INTERIOR-POINT METHODS NONLINEAR PROGRAMMING NEWTONS METHOD METHOD OF CENTERS

来源：评论

学校读者我要写书评

暂无评论

PROGRAM VIEW GENERATION AND CHANGE ANALYSIS USING ATTRIBUTED DEPENDENCY GRAPHS

引用

JOURNAL OF SOFTWARE MAINTENANCE-RESEARCH AND PRACTICE 1995年第4期7卷 239-261页

作者： ALZOUBI, R PRAKASH, A Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122 U.S.A. He is currently an Assistant Professor at Yarmouk University Irbed H.K. of Jordan. Earlier he has worked for the Ford Motor Company in Dearborn Michigan. His research interests are in the area of software engineering. Since 1989 he has been with the Department of Electrical Engineering and Computer Science at the University of Michigan Ann Arbor where he is currently an Associate Professor. His research interests include software engineering and computer-supported cooperative work. He is a member of the ACM and the IEEE Computer Society.

Software maintenance is usually the most expensive phase of the software life-cycle, Program understanding and impact-of-change analysis are two of the major activities during this phase, In this paper, we describe attributed program dependency graphs (APDGs), a model to store information derived from the program source code and ease construction of tools for software maintenance, We show how the model can be used for interactive view generation and doing two kinds of impact-of-change analysis-incremental and comparison-oriented. Incremental change analysis uses APDGs and a Rule Base to provide a way for the user to analysis the effect of proposed well-defined changes, Comparison-oriented change analysis allows a user to generate structural semantic differences between two versions of a subsystem after an arbitrary sequence of changes, We also introduce SCAN, a prototype collection of loosely integrated tools based on the APDG model and describe our experiences with the system.

关键词： PROGRAM REPRESENTATION DEPENDENCY GRAPHS PROGRAM UNDERSTANDING REVERSE-engineering REengineering IMPACT ANALYSIS CHANGE ANALYSIS

来源：评论

学校读者我要写书评

暂无评论

OPTIMUM FREQUENCY REUSE IN MOBILE TELEPHONY SYSTEMS

引用

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 185-190页

作者： KAZANTZAKIS, MG DEMESTICHAS, PP ANAGNOSTOU, ME National Technical University of Athens Computer Science Division Department of Electrical and Computer Engineering Heroon Polytechneiou 9 Zografou Athens 15773 Greece Michael G. Kazantzakii was born in Athens Greece in 1962. He received both the Diploma and Ph.D. Degree from the Electrical Engineering Department of the National Technical University of Athens in 1986 and 1992 respectively. During the period 1992–1993 he was a member of the Staff of the Hellenic Navy Research Centre working in the area of underwater acoustics. Since 1994 he has been a researcher at the National Technical University of Athens Department of Electrical Engineering and Computer Science Telecommunications Laboratory. His interests include data mobile and integrated services networks. Panagiotis P. Demestichas was born in Athens Greece in 1967. He received the Diploma in electrical engineering from the National Technical University of Athens (NTUA) Athens in 1993. At present he is a research assistant at NTUA working towards his Ph.D. dissertation. He participated in the BRITE/EURAM-EURATN and in the RACE-TOMQAT and MONET projects. His research interests are in the areas of broadband and mobile networks queueing theory algorithms and complexity theory. He is a Member of the Technical Chamber of Greece. Miltiades E. Anagnostou was born in Athens in 1958. He received the Electrical Engineers Diploma from the National Technical University of Athens (NTUA) in 1981. During the period 1981–1987 he was a teaching assistant at NTUA. In 1987 he received his Ph.D. in the area of computer networks. In 1987–1989 he served the Greek army in the Air Force Research and Development Center. In 1989–1991 he was a Lecturer and since 1991 he has been an Assistant Professor in the Computer Science Division Department of Electrical and Computer Engineering of the NTUA. He teaches courses on modern telecommunications formal specification of protocols stochastic processes and queueing theory. Since 1981 Dr. Anagnostou has been involved

The reason why cellular mobile telephony systems exist is that they allow frequency reuse. Dynamic allocation algorithms improve the network efficiency and the service quality. Dynamic allocation is closely related to the following instantaneous allocation problem: given a number of channels (frequencies), a cell structure and the number of calls to be accommodated in each cell, find the optimum allocation of channels to cells subject to restrictions concerning the distance of cells, where the same frequency can be reused. In this paper we formulate and solve this problem by showing that it can be reduced to a 0-1 programming problem. Finally we present results, and draw subsequent conclusions.

关键词： MOBILE TELEPHONY FREQUENCY ALLOCATION UMTS

来源：评论

学校读者我要写书评

暂无评论

ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

引用

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

来源：评论

学校读者我要写书评

暂无评论

PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

引用

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

来源：评论

学校读者我要写书评

暂无评论

Applying multimedia technology to undergraduate engineering laboratories

引用

computer Applications in engineering Education 1995年第3期3卷 157-157页

作者： Elsherbeni, A. Tew, M. Mokaddem, A. Electrical Engineering Department University of Mississippi University Mississippi 38677 Atef Z. Elsherbeni:received an honorary BS degree in Electronics and Communications an honorary BS degree in Applied Physics and a Meng degree in Electrical Engineering all from Cairo University Egypt in 1976 1979 and 1982 respectively and a PhD degree in Electrical Engineering from Manitoba University Canada in 1987. From January to August 1987 he was a postdoctoral fellow at the Electrical Engineering Department University of Manitoba. He joined the faculty at the University of Mississippi in 1987 as an assistant professor and advanced to the rank of associate professor in 1991. His professional interests include microstrip transmission lines and antennas scattering and diffraction numerical techniques and computer applications for electromagnetic education. Dr. Elsherbeni is a senior member of IEEE and a member of Commission B of the International Union of Radio Science (URSI). His honorary memberships include the Electromagnetics Academy and the Scientific Sigma Xi Society. Mark D. Tew:obtained his BS in Electrical Engineering with highest honors in 1971 and an MS in Electrical Engineering in 1973 from the University of Mississippi. He attended the University of Illinois at Urbana-Champaign as a TRW Doctoral Fellow and received the PhD in 1979. He joined the University of Mississippi in 1979 and was appointed associate professor in 1986. His interests lie in improving undergraduate laboratories through the incorporation of computer-aided data acquisition and introduction of multimedia. He is a senior member of IEEE and member of several honorary societies.

This article presents efforts to improve the presentation of material in high frequency, microwave, and electronics laboratories using multimedia technology. A crowded undergraduate curriculum leaves little time to dwell on difficult concepts in these areas of study, yet the laboratory experience is enhanced by greater understanding. A moderate or small-sized electrical engineering department is well suited for a one-on-one approach to teaching where close faculty—student interaction serves to fill many student needs. Even in this environment, better visualization tools may increase learning by reinforcing material introduced in the classroom. This project uses multimedia to enhance instruction and presentation in the high frequency, microwave, and electronics laboratories.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Using simulation with hardware verification for teaching computer architecture

引用

computer Applications in engineering Education 1995年第3期3卷 173-173页

作者： Segee, B. Field, J. Littlefield, B. Department of Electrical and Computer Engineering University of Maine Orono Maine 04469—5708 Bruce E. Segee:is an Assistant Professor of Electrical and Computer Engineering at the University of Maine. He received BSEE (1985) and MSEE (1989) degrees from the University of Maine and a PhD from the University of New Hampshire (1992). He is a member of IEEE Eta Kappa Nu Tau Beta Pi and Sigma Xi. Dr. Segee's technical interests are in the areas of computer architecture neural networks instrumentation and industrial automation. He is the co-author of a John Wiley textMicroprogramming and Computer Architecture. John C. Field:is Professor and Chairperson of the Electrical and Computer Engineering Department at the University of Maine. He received the BSEE (1963) MSEE (1965) and PhD (1969) degrees all from Northeastern University. He is a member of IEEE Eta Kappa Nu Tau Beta Pi Sigma Xi and Phi Kappa Phi. Dr. Field's technical interests are in the areas of computers and microprocessor applications. He is the co-author of a John Wiley textMicroprogramming and Computer Architecture.

Material for a computer architecture class based on four progressively more complex microprogrammed circuits is described. The circuits and their associated microassemblers and simulators are discussed. Interestingly, the simulators allow students to understand the workings of the hardware more fully than is possible using the hardware alone.

关键词：

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：