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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： N. Ikoma K. Ozawa K. Hirota W. Pedrycz Department of Statistical Mathematics. Graduate University Tokyo Japan Faculty of Economics HOSEI University Machida Tokyo Japan Department of Systems Control Engineering College of Engineering. HOSEI University Koganei Tokyo Japan Department of Electrical and Computer Engineering University of Manitoba Winnipeg Canada

The fuzzy sequential circuit and its learning algorithm are proposed. The circuit consists of the weight-added fuzzy flip-flops. The weight-added fuzzy flip-flop is constructed by weight-added AND/OR elements. To illustrate the modeling process of the fuzzy sequential circuit, the circuit is applied to part of a small economic model. In this example, each economical variable corresponds to the weight-added fuzzy flip-flop identically, and the relationships of cause and effect are realized by supplementary using of the ordinary AND/OR elements. The topology of fuzzy sequential circuit is defined by the relationships of cause and effect. The weight parameters of each weight-added fuzzy flip-flop are estimated by the learning algorithm proposed.< >

关键词： Sequential circuits Flip-flops Fuzzy control Fuzzy systems Mathematical model Biological system modeling Difference equations Feedback control Adders Fuzzy logic

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control of unknown systems using switching controllers: an experimental study

Control of unknown systems using switching controllers: an e...

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American control Conference (ACC)

作者： M. Chang E.J. Davison Systems Control Group Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada University of Toronto Toronto ON CA Dept. of Electr. Eng. & Comput. Eng. Toronto Univ. Ont. Canada

In this paper, the problem of implementing the Miller-Davison (1989) self-tuning integral robust servomechanism for the case of constant references and disturbances is considered and examined using an experimental multi-input multi-output apparatus; cases involving both known and unknown estimates of the steady state gain matrix T are considered. In order to improve the speed of response, proportional feedback has been added in both instances, and this has yielded a superior transient response.

关键词： control systems Open loop systems Pi control Proportional control Valves Robust control Transient response Actuators State estimation Steady-state

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Identification with Generalized Orthonormal Basis Functions - Statistical Analysis and Error Bounds

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IFAC Proceedings Volumes 1994年第8期27卷 1169-1174页

作者： P.M.J. van den Hof P.S.C. Heuberger J. Bokor Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands National Institute of Public Health and Environmental Protection (RIVM) P.O. Box 1 3720 BA Bilthoven The Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H 1502 Budapest Hungary

A least squares identification method is studied that estimates a finite number of expansion coefficients in the series expansion of a transfer function, where the expansion is in terms of recently introduced generalized basis functions. The basis functions are orthogonal in H 2 and generalize the pulse, Laguerre and Kautz bases. One of their important properties is that when chosen properly they can substantially increase the speed of convergence of the series expansion. This leads to accurate approximate models with only few coefficients to be estimated. Explicit bounds are derived for the bias and variance errors that occur in the parameter estimates as well as in the resulting transfer function estimates.

关键词： System identification orthogonal basis functions FIR models linear regression modelling errors system approximation

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THERE ARE NO IN-SITU METHODS

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GROUND WATER MONITORING AND REMEDIATION 1994年第4期14卷 120-123页

作者： NYER, EK SCHAFER, DC Evan K. Nyer is an expert in the research and application of technology to ground water cleanup. As vice president of technical resources with Geraghty & Miller Inc. (1099–18th St. Ste. 2100 Denver CO 80202) he is responsible for maintaining and expanding Geraghty & Miller's technical expertise in geology/hydrogeology engineering modeling risk assessment bioremediation and many other areas. He also provides expertise in engineering services including the design of treatment systems for contaminated water sites throughout the United States. He has designed and installed more than 100 ground water and soil remediation systems. He is a member of the Water Pollution Control Federation the National Ground Water Association the American Institute of Chemical Engineers and the American Society of Civil Engineers. David C. Schafer is a principal scientist/associate with Geraghty & Miller Inc. He attended the University of Minnesota where he obtained a bachelor's degree in mathematics and a master's degree in computer science. Prior to joining Geraghty & Miller he worked for a major water well equipment manufacturer for 19 years. Throughout his career he has specialized in the design of monitoring and production wells and the analysis and interpretation of pumping test data. He has written numerous articles on these subjects and has designed and analyzed pumping tests from hundreds of wells throughout North America.

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VES DESIGN - USING SIMPLE OR SOPHISTICATED DESIGN METHODS

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GROUND WATER MONITORING AND REMEDIATION 1994年第3期14卷 101-104页

作者： NYER, EK MACNEAL, RW SCHAFER, DC Evan K. Nyer is an expert in the research and application of technology to ground water cleanup. As vice president of technical resources with Geraghty & Miller Inc. (1099–18th St. Ste. 2100 Denver CO 80202) he is responsible for maintaining and expanding Geraghty & Miller's technical expertise in geology/hydrogeology engineering modeling risk assessment bioremediation and many other areas. He also provides expertise in engineering services including the design of treatment systems for contaminated water sites throughout the United States. He has designed and installed more than 100 ground water and soil remediation systems. He is a member of the Water Pollution Control Federation the National Ground Water Association the American Institute of Chemical Engineers and the American Society of Civil Engineers. Robert W. Macneal is a staff engineer with Geraghty & Miller Inc. with five years of experience in environmental consulting. He specializes in applying mathematical models to study saturated flow and transport processes in support of remediation design and risk evaluation. He conducts analyses to design and optimize soil venting bioventing air sparging and ground water recovery systems. He is a member of the Association of Ground Water Scientists and Engineers and the American Society of Civil Engineers. David C. Schafer is a principal scientist/associate with Geraghty & Miller Inc. He attended the University of Minnesota where he obtained a bachelor's degree in mathematics and a master's degree in computer science. Prior to joining Geraghty & Miller he worked for a major water well equipment manufacturer for 19 years. Throughout his career he has specialized in the design of monitoring and production wells and the analysis and interpretation of pumping test data. He has written numerous articles on these subjects and has designed and analyzed pumping tests from hundreds of wells throughout North America.

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USING VIRTUAL ENVIRONMENTS IN THE DESIGN OF SHIPS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 91-106页

作者： JONS, OP RYAN, JC JONES, GW Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hanover W. Germany and an MS in naval architecture and marine engineering from MIT. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship system integration as manager LHA ship systems engineering department. From 1972 to 1974 he was the principal research scientist at Hydronautics. In 1974 as technical director he helped establish the Crystal City office of Designers and Planners. Mr. Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he serves as corporate vice president engineering. J. Christopher Ryan:earned his bachelors and masters degrees in naval architecture from Webb Institute and MIT respectively. He spent three years at the advanced marine technology division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. He subsequently went to the Navy Department concentrating on early stage design of surface combatants for twelve years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the Technical Director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the director of the future ship concepts division. Gary W. Jones:graduated from the University of Tennessee in 1971 with a BS in mechanical engineering and followed up with graduate work at George Washington University and the University of Maryland. Mr. Jones was with the Naval Sea Systems Command from 1971 until 1988 where he was a naval architect in the submarine section of the hull form design division. In 1988 he was detailed to the Defense Advanced Research Projects Agency (DARPA) where he became the program manager for the advanced submarine technology program's hydrodynamic hydroac

A major contributor to the expense and length of time to design, build, and test new systems has been the need to build and test hardware prototypes to determine their effectiveness in meeting operational requirements. Recent and dramatic advances in computer simulation technologies hold forth the promise of revolutionizing design and acquisition strategies by providing the means to validate end users' requirements prior to hardware construction. By designing and operationally testing virtual prototypes in a virtual environment, these technologies will soon offer naval architects the ability to build and launch ships in computer-based cyberspace in lieu of the shipbuilder's ways. The authors of this paper provide the background for these developments, explore the significance and ramifications of these technologies to the current process of ship and system design, outline challenges lying ahead, and present their vision and recommendations for future development.

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ANALYSIS OF A MOVABLE BOUNDARY ACCESS TECHNIQUE FOR A MULTISERVICE MULTIBEAM SATELLITE SYSTEM

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 299-312页

作者： BOHM, S ELHAKEEM, AK MURTHY, KMS HACHICHA, M KADOCH, 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 . He is ITU's Specialist Consultant and Chief Advisor for a number of ITU/UNDP projects including VSATs Rural Networks Digital Broadc

In this paper, the performance of a new movable boundary accessing (MBA) technique for future integrated services multibeam satellite systems is studied. The multiservice environment considered includes both asynchronous and isochronous traffic consisting of video, voice, file transfer and interactive data. The movable boundary access technique proposed here will maximize the utilization of the up-link frame capacity. It is shown that the potential user population is substantially increased with the use of a moving boundary policy with minimal overhead.

关键词： MOVABLE BOUNDARY ACCESS TECHNIQUE MF-TDMA DAMA MULTIBEAM SATELLITE

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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 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 performance of a prioritized on-board baseband switch in conjunction with a multibeam 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 maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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EXPONENTIAL AND INPUT OUTPUT STABILITY ARE EQUIVALENT FOR LINEAR TIME-VARYING systems

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SADHANA-ACADEMY PROCEEDINGS IN engineering SCIENCES 1993年第1期18卷 31-37页

作者： RAVI, R KHARGONEKAR, PP Control Systems Laboratory General Electric Research and Development Center Schenectady USA Electrical Engineering and Computer Science The University of Michigan Ann Arbor USA

We present a new proof showing that for finite dimensional linear time-varying (FDLTV) systems stabilizable by output feedback, exponential and input-output stability are equivalent. This proof does not involve the notion of a dual system as has been done elsewhere and makes use instead of the existence of coprime factorizations. This result is analogous to that in the linear time-invariant case, but because of the time-varying nature of the matrices involved, is not as obvious.

关键词： EXPONENTIAL STABILITY INPUT OUTPUT STABILITY COPRIME FACTORIZATION TIME-VARYING systems

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Comparative study of self-organizing neural networks

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International Workshop on Artificial Neural Networks, IWANN 1993

作者： Wann, Chin-Der Thomopoulos, Stelios C. A. Decision and Control Systems Laboratory Department of Electrical and Computer Engineering The Pennsylvania State University University ParkPA16802 United States

ISBN: (纸本)9783540567981

A benchmark study of self-organizing neural network models is conducted. The comparison of advantages and disadvantages of unsupervised learning artificial neural networks are discussed. The unsupervised learning artificial neural networks discussed in this paper include adaptive resonance theory (ART2), DIGNET, self-organizing feature map, and learning vector quantization (LVQ). For the benchmark study of artificial neural network applications on data clustering and pattern recognition problems with additive gaussian noise, we compare the performance of the unsupervised learning systems, ART2 and DIGNET. Results of computer simulation show that both AR.T2 and DIGNET achieve good performance on pattern clustering, but DIGNET is faster in the learning process and has better results on the overall clustering performance. © Springer-Verlag Berlin Heidelberg 1993.

关键词： Unsupervised learning

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