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AN ALGORITHM FOR SIZING TRUNKS CARRYING MIXTURES OF CONSTANT AND VARIABLE BIT-RATE TRAFFIC

INTERNATIONAL JOURNAL OF COMMUNICATION systems 1995年第5期8卷 313-323页

作者： REGE, KM AT&T Bell Laboratories Room 3m-324 Holmdel New Jersey 07733 U.S.A. Kiran M. Rege is with the Performance Analysis Department of AT&T Bell Laboratories Holmdel New Jersey. He received his bachelor's degree from the Indian Institute of Technology Bombay in 1977 an M.E. from the University of Florida Gainesville in 1979 and a Ph.D. from the University of Hawaii Honolulu in 1981 all in Electrical Engineering. Besides working at AT&T Bell Laboratories he has spent a year teaching at I.I.T. Bombay and has worked with the Centre for Development of Advanced Computing Pune India. His research interests include performance modelling and analysis techniques queueing theory communication systems and natural language processing.

As new broadband networks based on the asynchronous transfer mode (ATM) protocol emerge to support a variety of services, the need for analytical models and tools for sizing network components carrying mixtures of different kinds of traffic will be increasingly felt. This paper presents a simple, yet efficient algorithm for sizing trunks carrying mixtures of constant and variable bit rate traffic. It combines theoretical results for the multi-dimensional Erlang model and the concept of equivalent bandwidth with some heuristic arguments to produce an analytic method for sizing trunks subject to blocking and quality of service constraints for traffic classes.

关键词： ATM ERLANG BLOCKING EQUIVALENT BANDWIDTH BROAD-BAND NETWORKS

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On the design of stabilizing control for structured uncertain singularly perturbed systems

On the design of stabilizing control for structured uncertai...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： B. Bandyopadhyay J. Nair M.C. Srisailam Systems and control engineering Electrical Engineering Department Indian Institute of Technology Bombay Bombay India

We deal with the design of robust controllers for a linear time invariant uncertain system exhibiting two time scale properties for the entire range of parameter variations. The uncertain system has been decomposed into slow and fast uncertain subsystems. The stabilizing controllers for the lower order subsystems are designed and a composite controller is obtained from them. This composite controller is shown to stabilize the higher order uncertain system, if applied to it. A numerical example illustrates the procedure.< >

关键词： control systems Uncertain systems Nonlinear dynamical systems control engineering Robust control Ear Robustness Time varying systems Arithmetic Rail to rail inputs

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Robust multivariable feedback design for an extractive distillation column

Robust multivariable feedback design for an extractive disti...

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1994 International Conference on control - control '94.

作者： P.S.V. Nataraj Systems and Control Group Departrment of Electrical Engineering Indian Institute of Technology Bombay India

In this paper, multivariable quantitative feedback theory (QFT) techniques are used to synthesize a robust feedback system for an extractive distillation column with a vaporous sidestream. The simplified state space model of Gilles and Retzbach (1983) for an extractive distillation column exhibiting sharp temperature profiles is adopted here. Large uncertainty of +20% is assumed in three key matrix elements of this model. The feedback design problem is to find the controller and prefilter matrices such that the stated tracking specifications are met, over the entire range of model parametric uncertainty. The fourth MIMO QFT technique of Yaniv and Horowitz (1986) is used to solve the design problem. The design is verified through extensive simulations in both frequency and time domains, for several plants picked from the plant uncertainty set. In all cases, the results obtained are quite satisfactory.< >

关键词： Feedback Frequency domain synthesis Matrices Multivariable systems Stability State space methods

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A MATLAB toolbox for QFT-based synthesis of linear/nonlinear lumped and linear distributed systems

A MATLAB toolbox for QFT-based synthesis of linear/nonlinear...

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IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： P.S.V. Nataraj Systems And Control Grow Department Of Electrical Engineering Indian Institute Of Technology Bombay India

We present QFT IIT, a MATLAB toolbox for quantitative feedback theory (QFT)-based synthesis of robust feedback systems. QFT IIT can handle several system classes including linear and nonlinear, single input-output and multi input-output, output and internal variable feedback, and linear distributed with distributed or point feedback types. We used QFT IIT to successfully solve a large number of robust control problems at The indian institute of technology (IIT) bombay.< >

关键词： MATLAB control system synthesis Robust control Nonlinear control systems Poles and zeros control systems Output feedback Packaging Robustness Distributed control

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An algorithm for recognizing palm polygons

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The Visual Computer 1994年第8期10卷 443-451页

作者： Ghosh, Subir Kumar Maheshwari, Anil Pal, Sudebkumar Prasant Madhavan, C.E.Veni Computer Science Group Tata Institute of Fundamental Research Bombay 400005 India Computer Systems and Communications Group Tata Institute of Fundamental Research Bombay 400005 India Department of Computer Science and Engineering Indian Institute of Technology Kharagpur 721302 India Department of Computer Science and Automation Indian Institute of Science Bangalore 560012 India

A polygon P is said to be a palm polygon if there exists a point x∈P such that the Euclidean shortest path from x to any point y∈P makes only left turns or only right turns. The set of all such points x is called the palm kernel. In this paper we propose an O(E) time algorithm for recognizing a palm polygon P, where E is the size of the visibility graph of P. The algorithm recognizes the given polygon P as a palm polygon by computing the palm kernel of P. If the palm kernel is not empty, P is a palm polygon. © 1994 Springer-Verlag.

关键词： Computational geometry Kernel Palm polygon Visibility graph Weak visibility polygon

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H/sub /spl infin// control synthesis for a flexible structure

H/sub /spl infin// control synthesis for a flexible structur...

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IEEE Conference on control technology and Applications (CCTA)

作者： Banavar Systems and Control Engineering Indian Institute of Technology Mumbai India

This paper investigates the feasibility of an H/sub /spl infin// controller for a large flexible structure with the actuator and sensor are located at the same spatial point. The controller is required to provide good disturbance rejection as well as prove robust to unmodelled dynamics of the system. Incorporating the dynamics of the actuator and modeling the structure as an eighth order linear model, a discrete time controller is synthesized with constraints on the control magnitude. Using suitable reduction techniques, the controller order is reduced to facilitate implementation.< >

关键词： Reduced order systems H-infinity control Flexible structures Dynamics Discrete time systems

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Evaporator control design: a quantitative feedback theory approach

Evaporator control design: a quantitative feedback theory ap...

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IEEE Conference on control technology and Applications (CCTA)

作者： Kundergi Nataraj Systems and Control Group Department of Electrical Engineering Indian Institute of Technology Mumbai India

In this paper, a robust multivariable two matrix degree of freedom feedback structure is designed for an evaporator example. The evaporator is described by a 2/spl times/2 transfer matrix having uncertain time-delays and gains. The desired tracking properties of the closed loop system are a priori given, and these are to be achieved despite the large parametric uncertainty. The third MIMO quantitative feedback technique (QFT) of Horowitz is used for the design. The obtained results are verified in both frequency and time domains through simulations, and found to be acceptable over the range of uncertainty considered.< >

关键词： Chemical industry Process control Transfer function matrices Feedback systems Uncertain systems Multivariable systems

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Variable structure control application for flexible manipulators

Variable structure control application for flexible manipula...

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IEEE Conference on control technology and Applications (CCTA)

作者： Ingole Bandyopadhyay Gorez System and Control Engineering Electrical Engineering Department Indian Institute of Technology Bombay Mumbai India Centre dIngénierie des Systèmes dAutomatique et de Mécanique Appliquée Université Catholique de Louvain Louvain-la-Neuve Belgium

Variable structure control (VSC) with sliding mode is a special type of control technique that is capable of making a control system very robust with respect to system parameter variations and external disturbances. Because of the robustness property, easy and decoupled design technique VSC finds important applications in control of flexible manipulators. Here, VSC application to a flexible one-link manipulator and a two link manipulator with last link flexible are considered. Simulation results are obtained to evaluate the performance of the controllers. Simulation results show that variable structure control with sliding mode can provide effective control of flexible manipulators.< >

关键词： Manipulators Variable structure systems Stability

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HYBRID SATELLITE AND TERRESTRIAL NETWORKS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 313-327页

作者： CHITRE, DM SHYY, DJ EPHREMIDES, A GUPTA, S COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871–9475 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN/Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Received the B.S. degree in electrical engineering from national Chiao-Tung University Hsin-Chu Taiwan in 1983 and the M.S. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology Atlanta GA in 1986 and 1990 respectively. From June 1987 to October 1987 he worked for the Department of Neurology Emory Univers

The role of satellite communications in networks that provide new services, such as frame relay and multimedia, is investigated. Both passive and active (on-board switching/processing) satellite systems are considered. Novel techniques are developed for each system to demonstrate, via detailed analysis and simulation, how the communications bandwidth agility of multipoint/broadcast satellite channels, and the on-board switching/processing, makes it feasible to provide these new services via hybrid satellite and terrestrial networks in a resource-efficient manner.

关键词： HYBRID NETWORKS ON-BOARD PROCESSING FRAME RELAY

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ASYNCHRONOUS TRANSFER MODE (ATM) OPERATION VIA SATELLITE - ISSUES, CHALLENGES AND RESOLUTIONS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 211-222页

作者： CHITRE, DM GOKHALE, DS HENDERSON, T LUNSFORD, JL MATHEWS, N COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN-Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Department manager for ISDN/Data Communications in the Network Technology Division of COMSAT Laboratories. His responsibilities include managing the implementation of next generation telecommunication systems for fixed and mobile satellite systems. Current projects include the development of a high data rate gateway switch that provides for the

Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, the impact of error characteristics and propagation delay on the operation of BISDN via satellite is discussed. Solutions are presented for removing adverse effects and providing high-quality service to users of BISDN via satellite.

关键词： ATM BISDN

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