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Frequency domain subspace model identification using the w -operator

IFAC Proceedings Volumes 1999年第2期32卷 3986-3991页

作者： Zi-Jiang Yang Kiyoshi Wada Faculty of Computer Engineering and System Science Kyushu Institute of Technology Iizuka Fukuoka 820-8502 TEL+81-948-29-7672 FAX+81-948-29-7651 Japan Department of Electrical and Electronic Systems Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Hakozaki Fukuoka 812 Japan

This paper proposes an efficient and convenient approach to frequency domain subspace identification for continuous-time systems. In the case of continuous-time models, the data matrices often become ill-conditioned if we simply rewrite the Laplace operator s as s = jw where w denotes the frequency. To avoid the ill-conditioned problem, the operator w = ( s - b.α)/( s + b.α) is introduced such that the system can be identified based on a state-space model in the w -operator. And then the estimated w -operator state-space model can be transformed back to the common continuous-time state-space model. An instrumental variable matrix in the frequency domain is also proposed to obtain consistent estimate in the presence of measurement noise.

关键词： Subspace model identification frequency domain continuous-time system w -operator Instrumental variable

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Subspace Model Identification for Continuous-Time Systems

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IFAC Proceedings Volumes 1997年第11期30卷 1567-1572页

作者： Zi-Jiang Yang Setsuo Sagara Kiyoshi Wada Faculty of Computer Engineering and System Science Kyushu Institute of Technology Iizuka Fukuoka 820 Japan TEL +81-948-29-7672 FAX +81-948-29-7651 Department of Communication Computer Engineering Fukuoka Institute of Technology Wajirohigashi Higashiku Fukuoka 811-02 Japan Department of Electrical and Electronic Systems Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Hakozaki Fukuoka 812 Japan

Usually, the subspace-based state-space system identification algorithms are focused on discrete-time models, which may cause some numerical problems when the sampling interval is small. This paper proposes an algorithm of subspace-based state-space system identification for continuous-time systems from sampled input-output data. The ω — operator ω = ( p - α)/( p + α) where p denotes a differential operator and α > 0, is introduced to avoid direct numerical differentiations. And the ω — operator state-space model identified by the 4SID method can be transformed back to the common continuous-time state-space model. The numerical superiority of the ω — operator approach compared to some other methods is verified through simulation study.

关键词： Subspace model identification continuous-time system ω—operator sampled data

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Laser diodes for chaotic optical data encryption

Laser diodes for chaotic optical data encryption

引用

European Conference on Security and Detection, 1997. ECOS 97.

作者： K.A. Shore S.I. Turovets J. Dellunde M.C. Torrent Bangor School of Electronic Engineering and Computer Systems University of Wales Bangor UK Institute of Physics National Academy of Science of Belarus Minsk Belarus Department d'Estructura i Const.de la Materia Facultat de Fisica Universitat de Barcelona Barcelona Spain Department de Fisica i Enginyeria Nuclear EUETIT Universitat Politecnica de Catalunya Terrassa Spain

Secure communication systems based upon chaotic encryption of data have recently attracted interest. An efficient algorithm for improving the locking rate between receiver and transmitter of such a system has been reported previously K.A. Shore and D.T. Wright (1994) and we have given consideration to techniques for the control of the nonlinear dynamics of lasers in general V.N. Chizhevsky and S.I. Turovets (1994; 1993) and, in particular, laser diodes (L.N. Langley et al., 1995) which can function as practical transmitters in chaotic optical data encryption systems. An investigation is undertaken of the use of continuous optoelectronic feedback in selecting periodic dynamics in external cavity laser diodes, subject to conventional optical feedback. Other work has explored the control of chaos in external cavity laser diodes using occasional proportional feedback (G.R. Gray et al., 1993) and direct modulation (N. Watanabe and K. Karaki, 1995).

关键词： Cryptography

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Study of inclusive baryon-antibaryon pair production of p or Λ in two-photon processes

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Zeitschrift für Physik C: Particles and Fields 1995年第1期69卷 597-606页

作者： Uehara, S. Abe, K. Amako, K. Arai, Y. Arima, T. Asano, Y. Chiba, M. Chiba, Y. Daigo, M. Fukawa, M. Fukushima, Y. Haba, J. Hamasaki, H. Hanai, H. Hemmi, Y. Higuchi, M. Hinode, F. Hirose, T. Homma, Y. Hosoda, N. Ishihara, N. Iwata, Y. Kanzaki, J. Kikuchi, R. Kondo, T. Korhonen, T.T. Kurashige, H. Matsuda, E.K. Matsui, T. Miura, M. Miyake, K. Mori, S. Nagashima, Y. Nakagawa, Y. Nakamura, T. Nakano, I. Odaka, S. Ogawa, K. Ohama, T. Ohsugi, T. Ohyama, H. Okabe, K. Okamoto, A. Ono, A. Oyama, T. Pennanen, J. Sakamoto, H. Sakuda, M. Sato, M. Sato, N. Shioden, M. Shirai, J. Shirakata, M. Sumiyoshi, T. Takada, Y. Takasaki, F. Takita, M. Tamura, N. Tatsumi, D. Tobimatsu, K. Tsuboyama, T. Unno, Y. Watanabe, T. Watase, Y. Yabuki, F. Yamada, Y. Yamagata, T. Yonezawa, Y. Yoshida, H. Yusa, K. KEK National Laboratory for High Energy Physics Tsukuba 305 Oho 1-1 Japan Department of Physics Tohoku University Sendai 980 Aza-Aoba Aramaki Aoba-ku Japan Institute of Applied Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Department of Physics Tokyo Metropolitan University Hachioji 192-03 Minami-Ohsawa 1-1 Japan Yasuda Women's Junior College Hiroshima 731-01 Yasuhigashi 6-13-1 Asa-Minami-ku Japan Faculty of Economics Toyama University Toyama 930 3190 Gofuku Japan Department of Physics Osaka University Toyonaka 560 Machikaneyama 1-1 Japan Department of Physics Kyoto University Kyoto 606 Oiwake-cho Kita-Shirakawa Sakyo-ku Japan Department of Applied Physics Tohoku-Gakuin University Tagajo 985 Chuo 1-13-1 Japan School of Applied Medical Science Kobe University Kobe 654-01 Tomogaoka 7-10-2 Suma-ku Japan Department of Physics Hiroshima University Higashi-Hiroshima 724 Kagamiyama 1-3-1 Japan Research Institute for High Energy Physics Helsinki University Helsinki SF-00170 Siltavuorenpenger 20C Finland Department of Physics Okayama University Okayama 700 Tsushimanaka 3-1-1 Japan Division of Natural Sciences International Christian University Mitaka 181 Ohsawa 3-10-2 Japan Faculty of Engineering Miyazaki University Miyazaki 889-01 Gakuen-Kibanadai-Nishi 1-1 Japan Institute of Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Hiroshima National College of Maritime Technology Hiroshima-ken 725-02 Higashino-cho 4272-1 Japan Faculty of Cross-Cultural Studies Kobe University Kobe 657 Tsurukabuto 1-2-1 Nada-ku Japan Department of Electronic and Computer Engineering Ibaraki College of Technology Hitachinaka 312 Nakane Japan Center for Information Science Kogakuin University Tokyo 163-91 Nishi-Shinjuku 1-24-2 Shinjuku-ku Japan Department of Physics Kogakuin University Tokyo 192 Nakano-cho 2665-1 Hachioji Japan Tsukuba College of Technology Tsukuba 305 Kasuga 4-1 Japan Naruto Universi

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e + e - collider TRISTAN, and correspond to an integrated luminosity of 303 pb-1. Correlations between a baryon ...

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e⁺ e^- collider TRISTAN, and correspond to an integrated luminosity of 303 pb^-1. Correlations between a baryon and an antibaryon were studied for their flavors (p or Λ) and their momentum vectors. The experimental results were compared with the expectations from a jet-fragmentation Monte Carlo simulation. We have found that although the ratios of the cross sections of different baryon-flavor combinations are consistent with the Monte Carlo expectations, the cross section shows an excess over the Monte Carlo expectation in a low invariant-mass region of final-state particles at large angles, that indicates a significant contribution from higher-order QCD or non-perturbative effects. The experimental data show no narrow azimuthal-angle correlation, which is expected from a jet-fragmentation Monte Carlo. A search for exclusive Λ pair production has also been made. We have no candidates and have obtained the upper limit for the cross section. © 1996 Springer-Verlag.

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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-electronic NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, 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 major limitation of the boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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The application of unsupervised artificial neural networks to the sub-classification of subjects at-risk of Huntington's Disease

The application of unsupervised artificial neural networks t...

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IEE Colloquium on Intelligent Decision Support Systems and Medicine

作者： B.W. Jervis M.R. Saatchi A. Lacey G.M. Papadourakis M. Vourkas T. Roberts E.M. Allen N.R. Hudson S. Oke School of Engineering Information Technology Sheffield UK Department of Electronic and Computer Engineering Technical University of Crete and the Institute of Computer Science Crete Greece Department of Medicine University of Crete Greece Department of Clinical Neurophysiolgy Derriford Hospital Plymouth UK The Somersel Health Authority Tone Vale Hospital Taunton UK

The contingent negative variation (CNV), which is an evoked response in the human electroencephalogram (EEG), was measured for a number of Huntington's disease patients (HDs) and subjects at-risk of developing HD (ARs), and for equal numbers of matched normal subjects. The sampled voltage response values and the duration of the CNV were then used as input data to Kohonen and ART2 unsupervised artificial neural networks to classify the subjects. The two methods gave similar results for the HDs vs normals which also agreed with the results of a cluster analysis. The results of attempting to identify abnormal ARs showed that the ART2 results showed partial agreement with the results of the Kohonen network and cluster analysis. The application of these unsupervised neural networks to the sub-typing of clinical categories appears to offer a relatively simple tool suitable for hardware implementation.< >

关键词： Bioelectric potentials Electroencephalography Biomedical computing Neural networks Medical diagnosis

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Image data compression using a self-organizing neural network with adaptive thresholds

Image data compression using a self-organizing neural networ...

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International Joint Conference on Neural Networks (IJCNN)

作者： S. Thacore V. Pang M. Palaniswami D. Bairaktaris Department of Electrical Electronic Engineering School of Information Technology & Electrical Engineering University of Melbourne Parkville VIC Australia Human Communication Research Centre University of Edinburgh Edinburgh UK Department of Computer Science Royal Melbourne Institute of Technology VIC Australia

Describes a novel neural network architecture which, when applied to image data compression, is capable of real-time, one shot, vector quantization. The major feature of this system is the utilization of an adaptive threshold mechanism. The architecture comprises a two-layer network and a winner-take-all cluster with adaptive thresholds. This system was used to generate a codebook for digital images.< >

关键词： data compression Neural networks Adaptive systems Image coding Vector quantization electronic mail Biomedical imaging Organizing Biomedical engineering data engineering

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Big data and Cloud Computing 1

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丛书名： Lecture Notes in Electrical engineering

1000年

作者： Neelanarayanan Venkataraman Lipo Wang Xavier Fernando Ahmed F. Zobaa

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Internet of Vehicles - Safe and Intelligent Mobility 1

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丛书名： Lecture Notes in computer science

1000年

作者： Ching-Hsien Hsu Feng Xia Xingang Liu Shangguang Wang

ISBN: (数字)9783319272931

ISBN: (纸本)9783319272924

This book constitutes the refereed proceedings of the Second;International Conference on Internet of Vehicles, IOV 2015, held in;Chengdu, China, in December 2015.;The 40 full papers presented were carefully reviewed and selected from;128 submissions. They focus on the following topics: IOV architectures and;applications; intelligent mobility; V2V and M2M communications; and modeling and simulations.

关键词： Systems and data Security Cryptology Algorithm Analysis and Problem Complexity Math Applications in computer science Special Purpose and Application-Based Systems computers and Society

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Serverless Computing: Principles and Paradigms 1

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丛书名： Lecture Notes on data engineering and Communications Technologies

1000年

作者： Rajalakshmi Krishnamurthi Adarsh Kumar Sukhpal Singh Gill Rajkumar Buyya

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