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IEEE Workshop on High Performance Switching and Routing

作者： A. Fumagalli L. Valcarenghi Optical Networking Advanced Research OPNEAR Lab Erik Jonsson School of Engineering and Computer Science University of Texas Dallas Richardson TX USA

ISBN: (纸本)0780367111

One of the expected benefits of wavelength division multiplexing (WDM) is the possibility to provide an optical layer (OL) with built-in capabilities to survive network component faults, e.g., fiber cut. Several schemes exist to design a reliable OL. These schemes are generally divided into protection and restoration techniques. Protection schemes reserve in advance a dedicated backup path and a wavelength that are readily available upon disruption of the working path. Restoration schemes, on the contrary, dynamically look for backup paths of spare wavelengths upon failure occurrence. The authors propose a fast and efficient path restoration scheme called preplanned weighted restoration (PWR). In the PWR scheme distinct restoration paths are precomputed at the source node during the connection setup. Upon failure, one of the preplanned paths is randomly selected depending on specific weights precalculated by the source node. The proposed scheme requires limited signaling upon failure occurrence as coordination among the source nodes involved in the restoration process is not required. Therefore, the scheme is fast and scalable in terms of number of network nodes, link or fiber capacity, and number of connections. Yet, the presented results show that the PWR scheme may considerably decrease the blocking probability of the restoration attempts when compared to other schemes such as alternate routing.

关键词： Signal restoration Wavelength division multiplexing Protection Optical fiber networks Optical devices WDM networks Costs Automatic control Optical control computer science

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Design of a multi-rate controller and its application to galvanometer servo systems

Design of a multi-rate controller and its application to gal...

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American Control Conference (ACC)

作者： Hee Choul Hwang Chung Choo Chung Seung-Hi Lee Digital Media Research Lab LG Electronics Inc. South Korea Division of Electrical and Computer Engineering Hanyang University Seoul South Korea Nan0 Systems Laboratory Samsung Advanced Institute of Technology South Korea

This paper presents a new multi-rate estimator design for multi-rate output feedback control (MROFC) using the current state estimator. It is shown that the principle of separation works in the design of MROFC. The MROFC system is shown to be less sensitive to noise disturbances than the single-rate control system. The proposed MROFC is applied to a galvanometer servo system. Simulation and experimental results show improved settling and tracking performance over the conventional single-rate control.

关键词： Control systems Servomechanisms Sampling methods State estimation Digital control Noise measurement Application software Output feedback Filters Bandwidth

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A work domain analysis for network management

A work domain analysis for network management

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Proceedings of the XIVth Triennial Congress of the International Ergonomics Association and 44th Annual Meeting of the Human Factors and Ergonomics Association, 'Ergonomics for the New Millennnium'

作者： Burns, Catherine M. Barsalou, Ed Handler, Cynthia Kuo, Johnson Harrigan, Kevin Advanced Interface Design Lab Dept. of Systems Design Engineering University of Waterloo Canada Department of Computer Science University of Waterloo Canada

computer networks are pervasive and critical to the operation of today's businesses. While most of us take computer networks for granted, network managers who must configure, operate, and fix faults in computer networks face a daunting task that becomes more complex everyday. Ecological interface design has been shown to be a promising approach for complex systems such as power plants or petrochemical systems. computer networks are a very different work domain characterized by rapid technological change, extreme decentralization, and the existence of "soft" components. This paper presents the first work domain analysis of this new domain creating an abstraction hierarchy for general signal transfer systems and general computing networks. It shows how the abstraction hierarchy can be applied to this new domain and presents the initial work on an ecological interface design for network management.

关键词： computer networks

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A miniature instrument tip force sensor for robot/human cooperative microsurgical manipulation with enhanced force feedback 3rd

A miniature instrument tip force sensor for robot/human coop...

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3rd International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2000

作者： Berkelman, Peter J. Whitcomb, Louis L. Taylor, Russell H. Jensen, Patrick Engineering Research Center for Computer Integrated Surgical Systems and Technology and Microsurgery Advanced Design Lab Johns Hopkins University BaltimoreMD21218 United States

ISBN: (纸本)3540411895

This paper reports the development of a new miniature force sensor to measure forces at the tip of a microsurgical instrument in three dimensions with sub-millinewton resolution. This sensor will enable enhanced force feedback during surgical intervention in which a user directly manipulates surgical instruments cooperatively with a forcereflecting robot arm. This "steady-hand" scaled force interaction enables a surgeon to sense millinewton forces between the instrument and delicate body tissues during microsurgery which would otherwise be far below the threshold of human tactile sensing. The magnified force feedback can increase the dexterity of the surgeon and improve safety by preventing large damaging forces from being exerted by the instrument. The design and analysis of the new force sensor is presented with preliminary testing and force scaling control results. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Feedback

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A Work Domain Analysis for Network Management

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 2000年第4期44卷 469 - 472页

作者： Catherine M. Burns Ed Barsalou Cynthia Handler Johnson Kuo Kevin Harrigan Advanced Interface Design Lab Department of Systems Design Engineering University of Waterloo Department of Computer Science University of Waterloo

computer networks are pervasive and critical to the operation of today's businesses. While most of us take computer networks for granted, network managers who must configure, operate, and fix faults in computer networks face a daunting task that becomes more complex everyday. Ecological interface design has been shown to be a promising approach for complex systems such as power plants or petrochemical systems. computer networks are a very different work domain characterized by rapid technological change, extreme decentralization, and the existence of “soft” components. This paper presents the first work domain analysis of this new domain creating an abstraction hierarchy for general signal transfer systems and general computing networks. It shows how the abstraction hierarchy can be applied to this new domain and presents the initial work on an ecological interface design for network management.

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Stability issues of finite precision state estimate feedback controller realizations for discrete time systems

Stability issues of finite precision state estimate feedback...

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作者： Wu, Jun Chen, Sheng Li, Gang Istepanian, Robert Habib Chu, Jian Whidborne, James F. National Lab. of Industrial Control Tech. Institute of Advanced Process Control Zhejiang University Hangzhou 310027 China Dep. of Electronics and Computer Sci. University of Southampton Highfield Southampton SO17 lBJ United Kingdom School of EEE Nanyang Technological University Singapore Dep. of Electrical and Computer Eng. Ryerson Polytechnic University Toronto ON M5B 2K3 Canada Department of Mechanical Engineering King's College London London WC2R 2LS United Kingdom

This paper present a new effective algorithm for the optimal realization of state estimate feedback controller structures for discrete time systems subject to finite-word-length constraints. The problem is formulated as a nonlinear programming to provide an easy and efficient optimization tool to solve such a complex problem. Simulation results of the optimum realizations of state estimate feedback controller structures are presented to illustrate the effectiveness of the proposed strategy. © 2000 American Automatic Control Council.

关键词： Nonlinear programming

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Fusion method for physical systems based on physical laws

Fusion method for physical systems based on physical laws

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International Conference on Information Fusion

作者： N.S.V. Rao D.B. Reister J. Barhen Center for Eng. Sci. Adv. Res. Oak Ridge Nat. Lab. TN USA Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN USA

Considers a physical system described by a set of parameters. Each parameter is either measured by a number of sensors or estimated by a set of computer programs that use sensor measurements. As a result, the resultant parameter values could be widely varying. We propose a fusion method that combines the measurements and estimators based on the physical laws that relate the parameters. In comparison with the traditional fusion problems, there is no training set that provides the actual parameter values. Furthermore, since every parameter is measured or estimated, there are no parameters whose actual values are known. We propose a fuser based on the least violation of the physical laws that relate the parameters. Under certain smoothness conditions on the physical law, we show the asymptotic convergence of our method, and also derive distribution-free performance bounds based on finite samples. We illustrate the effectiveness of this method for a practical problem of fusing well-log data in methane hydrate exploration. For this problem, the data fusion method resulted in an order-of-magnitude improvement in the accuracy compared to the best set of estimators for the key parameter of porosity.

关键词： Training data Sensor fusion computer errors Jacobian matrices computer science Mathematics laboratories Convergence Instruments Physics computing

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A study of limit cycles and chaotic motions of a single-link robot manipulator during slow motion

A study of limit cycles and chaotic motions of a single-link...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Dalong Wang Yan Liu Max Meng ART Advanced Robotics & Teleoperation Lab Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

In this paper, limit cycles and chaotic motion of a single-link robot manipulator moving at low speed are investigated. The dynamic model of the one-link robot manipulator is set up in which different joint friction is considered. By using the describing function of the nonlinear part of the robot control system, stable limit cycles are proven to exist. The chaotic motion is shown via a Poincare map. Numerical simulations identify the chaotic zone location near the imaginary axis of the complex plane.

关键词： Limit-cycles Chaos Friction Manipulator dynamics Service robots Nonlinear dynamical systems Robot control Control system synthesis Robot sensing systems Torque

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Real-time trajectory generation with clearance from obstacles

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IFAC Proceedings Volumes 1999年第2期32卷 5338-5343页

作者： Xianyi Yang Max Meng Advanced Robotics and Teleoperation (ART) Lab Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2G7 Canada

A neural network approach to real-time trajectory generation with clearance from obstacles in a nonstationary environment is proposed based on a biologically inspired model for a mobile robot. It is also extended to multi-joint robot manipulators. The strength of obstacle clearance is adjustable. The optimal trajectory is generated by implicitly minimising the robot travel distance while considering the obstacle clearance. The generated real-time “comfortable” path does not suffer from the “too close” or the “too far” problems. The stability is guaranteed by Lyapunov stability analysis. The effectiveness and the efficiency are demonstrated through simulation and comparison studies.

关键词： Real-time robot navigation obstacle avoidance global stability neural networks efficient algorithms

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Pade approximation analysis of reflection at optical waveguide facets

Pade approximation analysis of reflection at optical wavegui...

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Integrated Photonics Research, IPR 1999

作者： El-Refaei, Hatem Yevick, David Betty, Ian Department of Electrical and Computer Engineering Queen’s University KingstonK7L 3N6 Canada Nortel Networks Advanced Technology Lab Box 3511 Station C OttawaK1Y 4H7 Canada

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