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ASME 1999 Design engineering Technical Conferences, DETC 1999

作者： Luo, Ningsu Rodellar, Jose Sen, Manuel De La Veh, Josep Campus Montilivi P-ll Dept of Electronics Automatic Control and Computer Engineering University of Girona Girona17071 Spain Department of Applied Mathematics III School of Civil Engineering Technical University of Catalonia Barcelona08034 Spain Department of Electricity and Electronics Faculty of Science University of Basque Country Bizkaia Leioa48940 Spain

ISBN: (纸本)9780791819760

In this paper, an adaptive decentralized controller is presented to attenuate the transversal vibration of a flexible cablestayed bridge induced by seismic excitation, in which only local sensor information has been used to generate the control signal that is sent to the actuator. The dynamic behavior of the beam structure is characterized by a nonlinear mathematical model with interconnection terms, which was obtained by using technique of finite element. The controller design is made based on the principle of sliding mode such that a priori knowledge on the exact value of system parameters, structural disturbances and the seismiic excitation is not required. In particular, it is assumed that the upper and lower bounds for the seismic excitation are also unknown. The closed-loop robust stability has been achieved through the generation of a sliding motion in the system. Nu-merical simulation is done to illustrate the effectiveness of the proposed control scheme for a scaled model of the bridge subject to the Taft earthquake. © 1999 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： controllers

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Adaptive real-time control of a Christmas tree using a novel signal processing approach

Adaptive real-time control of a Christmas tree using a novel...

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American control Conference (ACC)

作者： J. Hu H.R. Wu C.T. Chou M. Verhaegen D. Westwick G. Nijsse School of Computer Science and Software Engineering Clayton Australia Control Laboratory Faculty of Information Technology and Systems Delft University of Technnology Delft Netherlands

The LMS algorithm forms the core of a number of adaptive control schemes. It has on one hand provided certain degree of robustness to these algorithms but on the other hand its convergence rate is notoriously slow. We propose a method to initialize the LMS algorithm which dramatically shortens its adaptation period. We also prove that under certain condition this initialization can be computed without explicit knowledge of either the reference or noise spectrum. Although the work is illustrated using the filtered-X scheme, this idea can also be applied to other similar schemes. Two successful experiments starting from black-box identification to real-time control have verified the effectiveness of this idea.

关键词： Programmable control Adaptive control Adaptive signal processing Least squares approximation Signal processing algorithms control systems Testing Active noise reduction Noise cancellation Optimal control

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A parallel analog intelligent vision sensor with a variable receptive field

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Systems and computers in Japan 1999年第1期30卷 60-69页

作者： Yagi, Tetsuya Kameda, Seiji Iizuka, Kunihiko Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka 820-8502 Japan Advanced Technology Research Laboratories Sharp Tenri 632-0004 Japan Institute of Physiological Science Okazaki Japan Nagoya Institute of Technology Japan Institute of Electronics Information and Communication Engineers Japan Society of Instrument and Control Engineers Japan Japanese Neural Network Society Japan Association for Research in Vision and Opthalmology Japan Kyushu Institute of Technology Japan Advanced Technology Research Laboratories Tenri Japan

The retina is an intelligent vision sensor indispensable in real-time image information processing of animals. The parallel image processing function of the retina was realized in an analog CMOS integrated circuit (vision chip). The chip was implemented with a one-dimensional Laplacian-Gaussian receptive field the size of which can be controlled by external signals. Active pixel sensors were used in the sensor part of the chip where the light sensitivity can be controlled by varying the accumulation time. Circuits compensating for noise due to the mismatch of transistor characteristics were incorporated, and the experimental results verified that sufficiently accurate outputs can be obtained under natural illumination. The chip can effectively extract the spatial frequency bandwidth of the signal in the presence of noise. © 1999 Scripta Technica.

关键词： Analog VLSI Laplacian-Gaussian Offset compensation Parallel processing Variable receptive field Vision chip

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Healthcare Informatics Society of Ireland

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Irish Journal of Medical science 1999年第4期168卷 276-282页

作者： Rigby, M. Sheridan, A. Draper, R. Stephens, G. Gaffney, P. Grimson, J. Avalos, G. Comerford, F. R. Kanagaratnam, B. Dineen, B. Hamilton, I. Jung, B. Felton, E. Berry, D. Grimson, W. Rice, D. H. Healy, M. Bruce, A. Kelly, J. Carroll, T. Grogan, A. Hurl, G. A. Hyland, D. Roberts, J. Brazil, J. Callanan, I. Devitt, A. O’Brien, T. O’Sullivan, U. M. Peyton, K. Wilson, M. J. Collins, R. Crawley, L. Foley, D. Strachan, H. McBrearty, P. Murnane, R. Murphy, E. Keane, V. Mulvany, F. Sweeney, P. D. Kenny, D. O’Connell, P. R. Balfe, P. Minogue, G. Centre for Health Planning & Management Keele University Keele Staffordshire Britain St. John of God Hospital Stillorgan Hospitaller Order of St. John of God Stillorgan Dept. of Computer Science Trinity College Dublin Clinical Chemistry Laboratory Tallaght Hospital Tallaght Dublin 24 Department of Experimental Medicine Faculty of Medicine National University of Ireland Galway Department of Health Promotion Faculty of Medicine National University of Ireland Galway School of Control Systems & Electrical Engineering Dublin Institute of Technology Ireland Shared Medical Systems Malvern USA Healy Services Dublin Universal Learning Systems Ltd. Dublin The Rotunda Hospital Dublin Mater Misericordiae Hospital Dublin Institute for Healthcare Informatics Dublin First Consulting Group Macclesfield Britain Virus Reference Laboratory UCD Belfield Dublin 4 Cappagh Orthopaedic Hospital Dublin Ireland Southern Health Board Cork Mater Misericordiae Hospital Dublin 7 DSS Dublin Ltd. Ireland University College Dublin Ireland Mary Aikenhead School of Nursing St. Vincent’s Hospital Dublin Blackrock Clinic Dublin Borders Community Health Services NHS Trust Britain James Connolly Memorial Hospital Blanchardstown Dublin 15 Kildare and West Wicklow Mental Health Service for People with A Learning Disability Eastern Health Board Dublin Health Research Board Dublin General Practice Research Unit The Medical Centre Dungloe Dept. of Clinical Biochemistry Our Lady’s Hospital for Sick Children Crumlin Dublin 12

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Adaptive RMRC for cooperative manipulation of a floating object by two free-based space robots

Adaptive RMRC for cooperative manipulation of a floating obj...

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Proceedings. 1998 IEEE/RSJ International Conference on Intelligent Robots and Systems. Innovations in Theory, Practice and Applications (Cat. No.98CH36190)

作者： S. Sagara M. Hideura R. Katoh T. Yamashita J. Kobayashi F. Ohkawa Department of Mechanical and Control Engineering Faculty of Engineering Kyushu Institute of Technology Kitakyushu Japan Department of Control Engineering and Science Faculty of Computer Engineering and Science Kyushu Institute of Technology Iizuka Japan

This paper deals with an adaptive resolved motion rate control (RMRC) method for a cooperative manipulation of a floating object by two free-based space robots with manipulators. Discussions as for the adaptive estimation are done on the divided generalized Jacobi matrices, which can be derived by system partition of the whole robot system. The method proposed here has an advantage that control algorithm of each robot is same even if a number of robots increases. The validity of the method was successfully confirmed by computer simulation.

关键词： Orbital robotics Robot kinematics Manipulators Space technology Adaptive control Jacobian matrices Motion control Velocity control computer simulation Robot control

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Scaling law for coherent vortices in decaying drift Rossby wave turbulence

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Physical Review E 1998年第2期57卷 1636-1636页

作者： Takeshi Watanabe Takahiro Iwayama Hirokazu Fujisaka Department of Physics Kyushu University 33 Fukuoka 812-81 Japan Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Japan

We numerically study the time evolution of coherent vortices in decaying turbulence described by the Charney-Hasegawa-Mima equation with the weak dissipation. Self-organized coherent vortices develop through the mutual advection and the vortex merging. The dimensional analysis provides the dynamical scaling law of structure function of the potential vorticity field S(k,t)=E5/4λ1/2t1/2G(k/k¯(t)) [k¯(t)∼E−1/8λ3/4t−1/4] with a scaling function G(x), which turns out to be in good agreement with numerical experiments. In physical space, quantities related to coherent vortices develop algebraically with time. The dimensional analysis predicts that the total number N of vortices decreases as N∼t−χ with exponent χ=1/2. Moreover, it is found that the remarkable feature of this system is the approximate conservation of the area of the coherent region in the potential vorticity field.

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Behavior of task scheduling algorithms with probabilistic module execution times

Behavior of task scheduling algorithms with probabilistic mo...

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IEEE Symposium on computers and Communications (ISCC)

作者： M. Kholief I. Awad M. El-Derini M. Nagi H. Ali Department of Computer Science Old Dominion University Norfolk VA USA Department of Computer Science and Automatic Control Faculty of Engineering Alexandria University Alexandria Egypt

Static task scheduling in distributed computing systems is a very complex problem and known to be NP-hard. This problem is even harder when the module execution times become probabilistic. In this paper we study the effect of probabilistic module execution times on the performance of task-scheduling algorithms. We show that in static task scheduling, for probabilistic module execution times, and in the existence of some factors there is no need to use an expensive task-scheduling algorithm. Given any two static task-scheduling algorithms that use deterministic module execution times in assigning task modules to the distributed system, the performance of these two algorithms will not remain the same when these module execution times become probabilistic rather than deterministic. We also study the effects of some factors an our results.

关键词： Scheduling algorithm Processor scheduling computer science Automatic control Read only memory Distributed computing Heuristic algorithms State-space methods

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Automatic control and adjustment of TV picture geometry

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IFAC Proceedings Volumes 1998年第31期31卷 189-192页

作者： Jože Mohorko Peter Planinšič Žarko Čučej University of Maribor Faculty of Electrical Engineering Computer Science and Information Technology Laboratory for signal processing and remote control 2000 Maribor Smetanova 17 Slovenia

The foundation of computer vision system for testing, controlling and adjusting of the TV sets is a mathematical model of distortion of the TV picture. Adequate accurate model description parameters are given by polynomial of order eight and knowledge based nonlinear, cross coupled relationships between command variables for adjusting of the TV sets and coefficients of polynomial.

关键词： Television Quality control Polynomials Model based control Image recognition Adaptive Bad data identification

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Royal Academy of Medicine in Ireland - Section of Bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL science 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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A circuit for high-speed time switching

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IEEE TRANSACTIONS ON COMMUNICATIONS 1997年第3期45卷 287-288页

作者： Bucholc, K Faculty of Electrical Engineering Department of Control Robotics and Computer Science Poznan University of Technology Poznan Poland

A method of time switching for time-division communication systems is introduced, A compact shift register-based circuit is used for this purpose in order to achieve high-speed switching.

关键词： time-division communication time switching

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