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ROBUST OUTPUT FEEDBACK CONTROL FOR DISCRETE TIME-DELAY UNCERTAIN SYSTEMS

CONTROL AND INTELLIGENT SYSTEMS 2006年第1期34卷 57-63页

作者： Shi, P. Lin, Z. Shi, Y. School of Technology University of Glamorgan Pontypridd CF37 1DL United Kingdom Department of Electrical and Computer Engineering University of Toronto Toronto Ont. M5S 3G4 Canada School of Information Science Kyushu Tokai University Kumamoto 862-8652 9-1-1 Toroku Japan School of Technology University of Glamorgan United Kingdom IMA United Kingdom IEEE United Kingdom University of Toronto Canada School of Information Science Kyushu Tokai University Japan World Scientific and Engineering Academy and Society (WSEAS) Japan Japan Society for Fuzzy Theory and Intelligent Informatics (SOFT) Japan Information Processing Society Japan Biomedical Fuzzy Systems Association (BMFSA) Japan

This paper studies the problem of robust output feedback control of discrete time-delay systems with parameter uncertainties. The parameter uncertainties under consideration are time varying and norm bounded. A sufficient condition for the existence of a dynamic output-feedback controller is presented in terms of linear matrix inequalities (LMIs). It is also shown that the set of dynamic output-feedback controller can be implicitly parameterized by the solutions (X, Y, R, S) to the LMIs. An example is given to demonstrate the potential of the proposed techniques.

关键词： LMI parameter uncertainty time-delay system robust control

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General Active-RC filter model for computer-aided design

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Bulletin of the Polish Academy of Sciences: Technical Sciences 2006年第1期54卷 89-100页

作者： KozieL, S. Szczepański, S. Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Ont. L8S 4K1 Canada Faculty of Electronics Telecommunications and Informatics Gdańsk University of Technology 11/12 Narutowicza St. Poland

In the paper, a general topology of continuous-time Active-RC filter is presented. The model includes all possible Active-RC filter structures as particular cases and allows us to analyze them using a unified algebraic formalism. This makes it suitable for use in computer-aided analysis and design of Active-RC filters. By its construction, the model takes into account the finite DC gain and the finite bandwidth as well as non-zero output resistance of operational amplifiers. Filters with ideal OPAMPs can be treated as particular cases. Sensitivity and noise analysis of Active-RC filters is also performed in the proposed general setting. The correctness of the model is verified by comparison with SPICE simulation.

关键词： Active filters

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A Healthcare Pattern Collection for Rural Telemedicine Services

A Healthcare Pattern Collection for Rural Telemedicine Servi...

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International Conference on e-health Networking, Applications and Services (HealthCom)

作者： Po-Hsun Cheng Jer-Junn Luh Ming-Fong Shyu Heng-Shuen Chen Sao-Jie Chen Jin-Shin Lai Feipei Lai Information Systems National Taiwan University Hospital Taipei Taiwan School & Graduate Institute of Physical Therapy College of Medicine National Taiwan University Taipei Taiwan Department of Computer Science & Information Engineering Chao Yang University of Technology Taipei Taiwan Department of Family and Department of Medical Informatics National Taiwan University Hospital Taipei Taiwan Graduate Institute of Electronics Engineering & Depertment of Electrical Engineering National Taiwan University Taipei Taiwan Department of Physical Medicine & Rehabilitation & Department of Medical Informatics National Taiwan University Hospital National Taiwan University College of Medicine Taipei Taiwan Department of Computer Science & Information Engineering National Taiwan University Taipei Taiwan

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Introducing Grammatical Evolution in Fetal Heart Rate Analysis and Classification

Introducing Grammatical Evolution in Fetal Heart Rate Analys...

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International IEEE Conference on Intelligent Systems, IS

作者： Ioannis Tsoulos George Georgoulas Dimitris Gavrilis Chrysostomos Stylios Joao Bemardes Peter Groumpos Computer Science Department University of Ioannina Ioannina Greece Laboratory for Automation and Robotics University of Patras Patras Greece Department of Electrical and Computer Engineering University of Patras Patras Greece Laboratory for Automation and Robotics Informatics and Management Artas Greece Department of Gynecology and Obstetrics Porto Portugal Department of Gynecology and Obstetrics Porto Faculty of Medicine Porto Portugal Laboratory for Automation & Robotics University of Patras Patras Greece

Electronic fetal monitoring is an essential tool for fetal surveillance during labor. It is mainly based on the monitoring and evaluation of the fetal heart rate (FHR) signal, which has to be interpreted online. Evaluation and interpretation of FHR gives an indication of the fetal condition. A lot of research efforts have been done towards the development of automatic and reliable methods for processing and evaluating FHR. This research work introduces an integrated methodology for processing and classifying FHR based on the novel approach of grammatical evolution for feature construction and selection. The proposed methodology is presented, and it is applied to a data set. Experimental results are promising paving the way for further research in that direction

关键词： Fetal heart rate Robotics and automation Signal processing Heart rate measurement computerized monitoring Neural networks Cardiology Laboratories Telephony Medical robotics

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Detrended Fluctuation Analysis: A Suitable Long-term Measure of HRV Signals in Children with Sleep Disordered Breathing

Detrended Fluctuation Analysis: A Suitable Long-term Measure...

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

作者： R. Krishnam S. Chatlapalli H. Nazeran E. Haltiwanger Y. Pamula Department of Electrical and Computer Engineering University of Texas El Paso El Paso TX USA School of Informatics and Engineering Flinders University of South Australia Adelaide Australia Faculty of Heath Sciences University of Texas El Paso El Paso TX USA Department of Pulmonary Medicine Women''s and Children''s Hospital Adelaide Australia

On the body surface the electric field generated by the cardiac muscles consists of electric potential maxima and minima that increase and decrease during each cardiac cycle. The recording of these electric potentials as a function of time is called electrocardiography, and the resulting signal is called the electrocardiogram (ECG). The ECG signal is used extensively as a low cost diagnostic tool to provide information concerning the heart's state of health. Reliable and accurate detection of the QRS complex and R wave peak in ECG signals is essential in computer-based ECG analysis. In this paper we evaluate the significance of detrended fluctuation analysis (DFA) for studying heart rate variability in children with sleep disordered breathing. An enhanced Hilbert transform (EHT) algorithm was used to derive the heart rate variability (HRV) signal. We compare the DFA values with approximate entropy and Poincare plots of HRV signals as these are very useful in characterization and visualization of HRV data. Our data demonstrated differences in DFA parameters between periods of normal and abnormal breathing and also between sleep stages. These results suggest that DFA is suitable for the long-term analysis of non-stationary time series such as HRV signals and may also be applied in the detection of sleep disordered breathing

关键词： Fluctuations Signal analysis Heart rate variability Sleep Electrocardiography Doped fiber amplifiers Electric potential Muscles Costs Pediatrics

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Secure Localization with Hidden and Mobile Base Stations

Secure Localization with Hidden and Mobile Base Stations

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： S. Capkun M. Cagalj M. Srivastava Informatics and Mathematical Modelling Department Technical University of Denmark Kongens Lyngby Denmark School of Computer and Communication Sciences Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland Networked & Embedded Systems Laboratory (NESL) Electrical Engineering Department University of California Los Angeles CA USA

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Efficient Fuzzy Cognitive Modeling for Unstructured Information

Efficient Fuzzy Cognitive Modeling for Unstructured Informat...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Kok Wai Wong T.D. Gedeon L.T. Koczy School of Information Technology Murdoch University Perth WA Australia Department of Computer Science Australian National University Canberra ACT Australia Institute of Information Technology Mechanical and Electrical Engineering Széchenyi István University Gyor Hungary Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper presents an efficient fuzzy cognitive modeling which can handle granulation, organisation and causation. This cognitive modeling technique consists of multiple levels where the lowest level includes details required to make a decision or to transfer to the next stage. This fuzzy cognitive modeling will enhance the usability of fuzzy theory in modeling complex systems as well as facilitating complex decision making process based on ill structured or missing information or data.

关键词： Fuzzy systems Machine intelligence Decision making Intelligent systems Fuzzy cognitive maps Humans Power system modeling Usability Information systems Artificial intelligence

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Efficient SIE/VIE scattering analysis of ferroelectric inhomogeneous materials with high permittivity for microwave applications

Efficient SIE/VIE scattering analysis of ferroelectric inhom...

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European Conference on Antennas and Propagation, EuCAP

作者： Georgios K. Avdikos Theodore Zervos Hristos T. Anastassiu Nikolaos K. Uzunoglu School of Applied Mathematics and Physics National and Technical University of Athens Zografou Greece National Centre for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece Communications and Networks Design & Development Department Hellenic AeroSpace Industry SA Viotia Greece School of Electrical and Computer Engineering National and Technical University of Athens Zografou Greece

Ferroelectric materials have been gaining much interest over the last decades due to the unique operational characteristics they demonstrate, when a dc electric field is applied. This paper investigates the scattering analysis of electromagnetic waves from materials with high permittivity that follows a linear spatial variation along one axis. The surface integral equation (SIE) and volume integral equation (VIE) methods are invoked to compute the currents and the radar cross section (RCS). The number of unknowns for the VIE is, as expected, larger than for the SIE method. The RCS and the induced current are associated in such a way that one can approximate the linear variation with relatively few elements (unknowns).

关键词： Ferroelectric materials Permittivity Electromagnetic scattering Radar scattering Integral equations Electromagnetic analysis Radar cross section Linear approximation Dielectric materials Microwave antenna arrays

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A genetic algorithm for the optimization of cable routing

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Systems and computers in Japan 2006年第7期37卷 61-71页

作者： Ma, Xuan Iida, Kazuhiro Xie, Mengchun Nishino, Junji Odaka, Tomohiro Ogura, Hisakazu Graduate School of Engineering University of Fukui Fukui City 910-8507 Japan Wakayama National College of Technology Gobo City 644-0023 Japan Faculty of Automation and Information Engineering Xi an University of Technology B Techno College Department of Electrical and Computer Engineering Wakayama National College of Technology Information Processing Society of Japan China Mechanical Design Society Department of Systems Engineering University of Electro-Communications Japan Society for Fuzzy Theory and Intelligent Informatics Japanese Academy of Facial Studies Japan Society of Kansei Engineering Graduate Program of Nuclear Power and Energy Safety Engineering Graduate School of Engineering Fukui University IEEE CS ACM IPSJ IEICE JSMBET Department of Human and Artificial Intelligent Systems JSAI Japan SOFT IEEE

In this paper the authors propose a structural method for a genetic algorithm (GA) for the optimization problem of cable routing in which cables have to be laid optimally. When there are no limits on the layout routes, the optimal routes for the individual cables can be found using the Dijkstra method in a finite discrete graph. However, when there are limits on the capacity in the layout routes, optimization cannot be performed using the Dijkstra method. The proposed GA is a two-level hierarchical GA that uses chromosome coding involving two levels. The routes for each cable and the combinations of cable routes are defined respectively, and layout route selection is optimized overall through genetic operations involving these levels. Block crossover and block mutation are used as genetic operations in the first level. In addition, a method to take advantage of lethal genes, which do not satisfy the constraints and are generated in the second level is used. computer simulations confirm that the two-level hierarchical GA with these genetic operations functions effectively for the optimization problem of cable routing. © 2006 Wiley Periodicals, Inc.

关键词： Electric cable laying

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Terahertz semiconductor quantum well devices

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

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Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2006年第4期27卷 627-634页

作者： Liu, H.C. Luo, H. Ban, D. Wächter, M. Song, C.Y. Wäsilewski, Z.R. Buchanan, M. Aers, G.C. SpringThorpe, A.J. Cao, J.C. Feng, S.L. Williams, B.S. Hu, Q. Institute for Microstructural Sciences National Research Council Ottawa K1A 0R6 Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Research Laboratory of Electronics Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 United States

For eventually providing terahertz science with compact and convenient devices, terahertz (1-10 THz) quantum-well photodetectors and quantum-cascade lasers are investigated. The design and projected detector performance are presented together with experimental results for several test devices, all working at photon energies below and around optical phonons. Background limited infrared performance (BLIP) operations are observed for all samples (three in total), designed for different wavelengths. BLIP temperatures of 17, 13, and 12 K are achieved for peak detection frequencies of 9.7 THz (31μm), 5.4 THz(56 μm), and 3.2 THz(93 μm).respectively. A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied. The S-doping density for each period varies from 3.2 × 1010 to 4.8 × 1010 cm2. We observe that the lasing threshold current density increases monotonically with doping concentration. Moreover, the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically. Interestingly the observed maximum lasing temperature is best at a doping density of 3.6 × 1010 cm-2.

关键词： Semiconductor quantum wells

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