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IEEE Conference on Decision and Control

作者： R.N. Paschall P.S. Maybeck Dept. of Electr. & Comput. Eng. Air Force Inst. of Technol. Wright-Patterson AFB OH USA Department of Electrical and Computer Engineering Air Force Institute of Technology OH USA

It is demonstrated that the LQR/LTR (linear quadratic Gaussian/loop transfer recovery) technique can be viewed as a way to achieve robustness even under the constraint of a reduced-order controller, even though one is not necessarily recovering a desired transfer function asymptotically. The optimal projection equation (OPE) approach gives an expanded view of LQG/LTR technique when the order of the controller is intentionally less than the order of the system design model. Also, the OPE approach allows other forms for Omega , which may give more flexibility as to how the system perturbations are modeled, to be chosen.< >

关键词： Hilbert space Riccati equations Robust control Control systems Optimal control Cost function Gaussian noise Q measurement Noise measurement Filtering theory

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A Markov random field model-based approach to image interpretation

A Markov random field model-based approach to image interpre...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： J.W. Modestino J. Zhang Dept. of Electr. Comput. & Syst. Eng. Rensselaer Polytech. Inst. Troy New York NY USA Department of Electrical Engineering and Computer Science University of Wisconsin Milwaukee Milwaukee WI USA Electrical Computer and System Engineering Department Rensselaer Polytechnic Institute RPI Troy NY USA

A Markov random field (MRF) model-based approach to automated image interpretation is described and demonstrated as a region-based scheme. In this approach, an image is first segmented into a collection of disjoint regions which form the nodes of an adjacency graph. Image interpretation is then achieved through assigning object labels, or interpretations, to the segmented regions, or nodes, using domain knowledge, extracted feature measurements, and spatial relationships between the various regions. The interpretation labels are modeled as a MRF on the corresponding adjacency graph, and the image interpretation problem are formulated as a maximum a posteriori estimation rule. Simulated annealing is used to find the best realization, or optimal interpretation. Through the MRF model, this approach also provides a systematic method for organizing and representing domain knowledge through the clique functions of the probability density function underlying MRF. Results of image interpretation experiments performed on synthetic and real-world images using this approach are described.< >

关键词： Markov random fields Image segmentation Image edge detection Integrated circuit modeling Feature extraction Image processing Layout Systems engineering and theory Erbium Biomedical measurements

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Diode and thyristor turn-off snubbers simulation by KREAN and an easy to use design algorithm

Diode and thyristor turn-off snubbers simulation by KREAN an...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： T.M. Undeland A. Petterteig G. Hauknes A.K. Adnanes S. Garberg Department of Electrical and Computer Engineering Norwegian Institute of Technology Trondheim Norway Dept. of Electr. & Comput. Eng. Norwegian Inst. of Technol. Trondheim Norway

RC snubbers must be used for limiting the overvoltages at the diode or thyristor reverse recovery transients. This is true for the application range from line frequency conversion to the output rectifiers in switched-mode DC power supplies. An insight into the mechanism of the turn-off waveforms is obtained by simulations and calculations, and the tradeoffs between overvoltages and losses are presented. An easy-to-use nomogram for the selection of the snubber components is given. A computer program dedicated for power electronic circuit analysis under development, KREAN, is used for the simulations, and is briefly described.< >

关键词： Diodes Thyristors Snubbers Surges Computational modeling Circuit simulation Circuit analysis computing Frequency conversion Rectifiers Switched-mode power supply

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A bandwidth efficient signaling for MFSK systems

A bandwidth efficient signaling for MFSK systems

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IEEE Conference on Vehicular technology (VTC)

作者： G.E. Atkin H.P. Corrales Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA

The use of a multiple-tone modulation scheme for a M-ary frequency shift keying (MFSK) system proves to be an efficient alternative for bandwidth constraint channels. A combinatorial design, called balanced incomplete block design, used to select the signaling format based on blocks of frequencies rather than single tones, as in a conventional MFSK system, is shown to reduce drastically the system bandwidth requirement and also to improve the performance of the system of a Rayleigh fading type of channel by adding an implicit diversity to the system. A nonbinary block code concatenated to the multi-tone MFSK system is considered, and it is shown to increase the diversity of the system, and consequently to improve its performance.< >

关键词： Bandwidth Frequency shift keying Signal design Frequency diversity Rayleigh channels Block codes Concatenated codes Degradation AWGN channels

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computer aided myoelectric training

Computer aided myoelectric training

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

作者： D.F. Lovely T.W. Hruczkowski R.N. Scott Dept. of Electrical and Computer Engineering University of Southern California Los Angeles USA Bio-Eng. Inst. New Brunswick Univ. Fredericton NB Canada

A training aid for young amputees with myoelectric prostheses has been developed using an approach based on computer games. With the use of custom-designed hardware and software, subject motivation is maintained while the therapist is provided with a permanent record of the training session. This record then can be used for subject evaluation purposes.< >

关键词： Prosthetics Hardware Vocational training Games Data acquisition Niobium Software maintenance Muscles Problem-solving computer interfaces

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Heuristic software partitioning algorithms for distributed real-time applications

Heuristic software partitioning algorithms for distributed r...

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International Conference on Software engineering (ICSE)

作者： H. Xin Z. Hong C. Xiyao Dept. of Comput. Sci. Northwest Telecommun. Eng. Inst. Xian China Department of Computer Science Northwest Telecommunications Engineering Institute Xi'an China

ISBN: (纸本)0897912586

The authors deal with the problems of software partition for distributed real-time applications. The software-partitioning models analyzed are those that take maximizing the efficiency in resource utilization for their objective, while observing the constraints on CPU throughput, memory space available, maximally allowed task execution time, and the order of module execution. The problem of software partition based on the models is proved to be NP-complete. There is no efficient partitioning algorithm for the models. The authors present two heuristic software-partitioning algorithms.< >

关键词： Heuristic algorithms Partitioning algorithms Software algorithms Application software Resource management Real time systems Costs Software performance Delay Throughput

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Real time control of multilevel manufacturing systems using colored Petri nets

Real time control of multilevel manufacturing systems using ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： E. Kasturia F. DiCesare A. Desrochers Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NM USA Dept. of Electr. Comput. & Syst. Eng. Rensselaer Polytech. Inst. Troy NY USA

A colored Petri net (CPN) model of a cell controller capable of real-time control and monitoring of multiple workstations is described. The need to incorporate the ideas of both computer integrated manufacturing (CIM) and flexible manufacturing systems (FMS) is discussed, and the controller is based on these concepts. The CPN for the cell controller is presented and described. The controller in this case controls two workstations: the Cincinnati Milacron 5VC machining center and a robotic assembly workstation using an Adept.robot. An analysis of the net is performed, and relevant portions are presented. A data structure for implementing this type of a CPN is given. The code for the controller is divided into application-dependent and -independent code. An execution algorithm is provided. The conclusions emphasize the advantages of CPNs in modeling and analysis for discrete-event control of manufacturing systems.< >

关键词： Real time systems Control systems Manufacturing systems Workstations computer integrated manufacturing Flexible manufacturing systems Robotic assembly computerized monitoring Milling machines Performance analysis

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REDUCTION METHOD OF TRACKING ERRORS DUE TO MULTIPATH WAVES IN DIRECT SEQUENCE SPREAD SPECTRUM SYSTEMS.

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Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi) 1987年第9期70卷 118-126页

作者： Maruyama, Satoshi Iwanami, Yasunori Ikeda, Tetsuo Faculty of Engineering Nagoya Institute of Technology Nagoya Japan 486 Satoshi Maruyama graduated 1983 Dept. Electrical Eng. Fac. Eng. Nagoya Inst. Technology. Completed Master's program 1985 Grad. School and affiliated with Fujitsu Co. Engaged in researches in distance measurement by spread spectrum technique. Tetsuo Ikeda graduated 1961 Dept. Comm. Eng. Fac. Eng. Tohoku University. Completed doctoral program 1966 Grad. School. Assistant 1966 and Assoc. Prof. 1968 Fac. Eng. Tohoku University. Assoc. Prof. 1973 and Prof. 1977 Nagoya Inst. Technology. Engaged in researches in network theory computer networks communication system and electromagnetic environment. Doctor of Eng. Member I.E.E.E. Japan TV Soc. Jap. Inf. Proc. Soc. Jap. Soc. Inf. Comm. and I.E.E.E.

The spread spectrum (SS) communication is a communication system which has excellent characteristics against.noise and is suited to the code-division multiplex. This paper describes a method which reduces the tracking phase error in DLL due to multipath waves in SS communication system. The method is based on the model with a single multipath wave.

关键词： RADIO TRANSMISSION

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The polylogarithm in the field of two irreducible quintics

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Aequationes Mathematicae 1986年第1期31卷 315-321页

作者： Abouzahra, M. Lewin, L. Lincoln Laboratory Massachusetts Inst. of Technology Lexington 02173 MA United States Dept. of Electrical and Computer Engineering University of Colorado Boulder 80309 CO United States

A brief review of the polylogarithmic ladder and its cyclotomic equation is followed by an application to the roots of two irreducible quintic equations. The first is unique in its class and possesses four accessible and two inaccessible valid ladders. The other equation gives rise to a single ladder determinable, at the present time, only by numerical computation, and is a member of a completely new category. © 1986 Birkhäuser Verlag.

关键词： AMS (1980) subject classification: Primary 33A70, 30D05

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Foreword

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 1983年 147 LNCS卷

作者： Goto, Eiichi Furukawa, Koichi Nakajima, Reiji Nakata, Ikuo Yonezawa, Akinori Dept. of Information Science Faculty of Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113 Japan Inst. for New Generation Computer Technology Mita Kokusai Building 1-4-28 Mita Minato-ku Tokyo108 Japan Research Institute for Mathematical Sciences Kyoto University Kyoto606 Japan Inst. of Information Sciences and Electronics University of Tsukuba Sakuramura Niihari-gunIbaraki305 Japan Dept. of Information Science Tokyo lnstitut of Technology Ookayama Meguro-ku Tokyo152 Japan

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