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IEEE Conference on Decision and Control

作者： R. Mantri A. Saberi Z. Lin A.A. Stoorvogel School of Electrical Engineering and Computer Science Washington State University Pullman WA USA Department of Applied Mathematics and Statistics Suny at Stony Brook Stony Brook NY USA Department of Mathematics and Computing Science Eindhovan University of Technology Eindhoven Netherlands

The purpose of this paper is to examine the problem of controlling a linear discrete-time system subject to input saturation in order to have its output track (or reject) a family of reference (or disturbance) signals produced by some external generator. It is shown that a semi-global framework, rather than a global framework, for this problem is a natural one. Within this framework, a set of solvability conditions are given and feedback laws which solve the problem are constructed. The theory developed in this paper parallels the one we developed earlier (1996) for the continuous-time system.

关键词： Control systems Regulators Feedback Linear systems Mathematics Signal generators Computer science Statistics Surges Hydraulic actuators

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MODELING AND ANALYSIS OF A SPRAY OF DROPLETS COMBUSTION PROBLEM

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ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK 1995年第8期75卷 583-597页

作者： POULY, L POUSIN, J Department of Mathematics Swiss Federal Institute of Technology CH 1015 Lausanne Switzerland Present Mathematical Modelling and Scientific Computing Laboratory URA CNRS 740 Bat. 401 National Institute of Applied Sciences Lyon 20 avenue A. Einstein F = 69621 Villeurbanne cedex France.

We consider a system of one-space-dimension equations describing the combustion of a splay of droplets for a laminar counterflow. The mathematical model is derived and the existence and uniqueness of a solution is proved by using a classical fixed point method. An asymptotic behaviour in time (representing the extinction of the flame) is obtained under restrictive conditions on the involved physical parameters. The influence of the size of the mean radius of the droplets is also investigated.

关键词： Combustion

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THE COMPLEX SUBSPACE ITERATION FOR THE COMPUTATION OF EIGENMODES IN LOSSY CAVITIES

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第6期8卷 385-398页

作者： SCHMITT, D SCHUHMANN, R WEILAND, T Technische Hochschule Darmstadt FB 18 Fachgebiet Theorie Elektromagnetischer Felder D-64289 Darmstadt Germany Dietmar Schmitt was born in Erfurt Germany in 1965. He received the Dipl.-Ing. degree in electrical engineering from the Technische Hochschule Ilmenau in 1990 and the Ph.D. degree from the Technische Hochschule Darmstadt department of ‘Theory of Electromagnnetic Fields’ in 1994. His main research interest is electromagnetic field theory with emphasis on numerical modelling and simlation. Rolf Schuhmann was born in Osterburken Germany in 1968. He received the Dipl.-Ing. degree in electrical engineering from the Technische Hochschule Darmstadt in 1994. Theomas Weiland born in 1951 studied electrical engineering and mathematics at the Technische Hochschule armstadt. In 1977 he received his Ph.D. In his thesis he worked out a finite difference method in the frequency domain and applied it to lossfree and lossy waveguide mode computation which resulted in unique solutionsa priorifree of spurious modes. As fellow at the European Institute for Nuclear Research (CERN Switzerland) he continued his work on electromagnetic computing extending yee's algorithm to include fields of moving charges. At the Deutsches Elektronen Synchrotron DESY in Hamburg he founded in 1983 an international collaboration for three-dimensional electromagnetic simulation. The software paaackage called MAFIA which resulted from this collaboration has been in use since 1984 in 22 countries and was the first widely distributed 3-D code for radiofrequency field simulation. In 1984 he published a basic paper on the matrix formulation of Maxwells' equations and the uniqueness of numeical solutions. For his contributions to the field of scientific computing he received in 1986 the ‘Physics Prize’ of the German Physical Society and the ‘Prize for Achievements in Accelerator Physics and Technology’ of the US Particle Accelerator School and the ‘Leibniz Prize’ from the German Research Association in 1987. His work on electrom

A typical application of numerical frequency-domain computations is the calculation of electromagnetic fields in cavities. Not only the field vectors of the desired modes, but also parameters such as the resonance frequency and, in the lossy case, the damping coefficient and the quality factor of the cavity can be obtained. This problem leads to an analytical eigenvalue equation, which can be transformed in an algebraic, complex, linear eigenvalue problem by the finite integration method. The consideration of energy losses in materials is straightforward in the analytical theory, using complex material quantities, but it is still a difficult subject area to solve a complex algebraic eigenvalue problem. Generally problems with very large, complex matrices (dimension >100,000) have to be solved, and no commonly applicable algorithm is known so far. This paper deals with a special variant of subspace iteration with polynomial acceleration, and some problems of the application of the complex Chebyshev polynomials are discussed. Two examples with weakly lossy cavities demonstrate the capability of the new algorithm, which is successfully applied to very large problems of up to 490,000 real unknowns.

关键词： Iterative methods

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Reception of multiple co-channel digital signals using antenna arrays with applications to PCS

Reception of multiple co-channel digital signals using anten...

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IEEE International Conference on Communications (ICC)

作者： S. Talwar A. Paulraj M. Viberg Scientific Computing University of Stanford Stanford CA USA Information Systems Laboratory University of Stanford Stanford CA USA Department of Applied Electronics Chalmers University of Technology Gothenburg Sweden

Antenna arrays can be used to increase system capacity in PCS networks by supporting multiple co-channel users per cell in receive and in transmit. We propose a novel approach for separating multiple digital signals received at an antenna array. Our approach exploits the temporal structure of digital signals to simultaneously determine the array response and the symbol sequence for each signal. Uniqueness of the estimates is established for signals with BPSK modulation format. This approach for separating digital signals is applicable to an unknown array geometry and propagation environment, which is particularly useful in PCS applications. Simulation results are presented to demonstrate the performance of this new technique.< >

关键词： Antenna arrays Personal communication networks Sensor arrays Receiving antennas Binary phase shift keying Modulation Signal processing Additive noise Delay effects Scientific computing

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Output regulation for linear systems subject to input saturation

Output regulation for linear systems subject to input satura...

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IEEE Conference on Decision and Control

作者： Zongli Lin A.A. Stoorvogel A. Saberi Department of Applied Mathematics and Statistics SUNY Stony Brook Stony Brook NY USA Department of Mathematics and Computing Science Eindhovan University of Technology Eindhoven Netherlands School of Electrical Engineering and Computer Science Washington State University Pullman WA USA

The purpose of this paper is to examine the problem of controlling a linear time-invariant system subject to input saturation in order to have its output track (or reject) a family of reference (or disturbance) signals produced by some external generator. It is shown that a semi-global framework for this problem is a natural one. Within this framework, a set of solvability conditions are given and feedback laws which solve the problem are constructed. The theory developed in this paper incorporates earlier results established for linear systems without input saturation.< >

关键词： Linear systems Control systems Mathematics Linear feedback control systems State feedback Statistics Computer science Signal generators Hydraulic actuators Art

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Demonstrator circuitry for optical data transcription and digital optical logic based on differential pairs of optical thyristors

Demonstrator circuitry for optical data transcription and di...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： H. Thienpoint T. van de Velde W. Peiffer A. Kirk M. Kuijk L. Dognin J. Fernandez I. Veretennicoff R. Vounckx P. Heremans G. Borghes Free University Brussels Applied Physics Department (TW/ TONA) Lab for Photonic Computing and Perception Pleinlaan 2 B-1050 Belgium Free Univeristy Brussels Applied Physics Department (TW/TONA) Lab for Microelectronics and Technology Pleinlaan 2 B-1050 Belgium Interuniversity Micro Electronics Center Kapeldreff 75 B-3001 Leuven Belgium

Among the most promising elements for digital parallel optical information processing are differential pairs of PnpN optical thyristors. We have shown very recently that these optical detector-generator type of devices can be switched-on in very short times (typical 10 ns) with very low switching energies (typical 40 fj of absorbed optical energy), while the problem of slow switch-off times, causing unpractical cycle times, was tackled using a double-heterojunction structure that can be completely depleted by means of a simple negative anode-to-cathode low voltage pulse. In this way PnpN thyristors with switch-off times of 10 ns became available.1

关键词： Logic circuits High speed optical techniques Optical saturation Thyristors Optical interconnections Photonics Electron optics Hardware Voltage Physics

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Silicon implanted oxide multifunctional optical switches for smart pixel arrays

Silicon implanted oxide multifunctional optical switches for...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： H. Thienpont W. Peiffer I. Veretennicoff C. de Tandt W. Randson R. Vounckx A. Koster Lab for Photonic Computing and Perception Applied Physics Department (TW/TONA) Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussel Belgium Labfor Microelectronics and Technology Applied Physics Department (TW/TONA) Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussel Belgium Institut d'Electronique Fondamentale (IEF) CNRS UA22 Université Paris-Sud Bat. 220 91405 Orsay France

In this paper we report on the progress which has been made in the fabrication and use of 2-D optical logic planes consisting of silicon hybrid electrically assisted thermo-optic resonators (HEATORS).1

关键词： Optical arrays Silicon Optical switches Smart pixels Optical resonators Circuits High speed optical techniques Nonlinear optics Optical sensors Optical modulation

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A NEW TOKEN RING PROTOCOL AND ITS PERFORMANCE FOR SINGLE AND DUAL RING LAN SYSTEMS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1994年第3期7卷 247-260页

作者： OBAIDAT, MS Department of Electrical Engineering City University of New York The City College Convent Ave. at 140th Street New York NY 10031 U.S.A. Mohammad S. Obaidat:received his B.S.E.E. with distinction from Aleppo University and M.S.E.E. and Ph.D. in Electrical and Computer Engineering from The Ohio State University Columbus Ohio. His previous posts were in the Departments of Electrical and Computer Engineering at Jordan University of Science and Technology and the University of Missouri. At present he is an Associate Professor in the Department of Electrical Engineering at The City College of The City University of New York. Dr. Obaidat is an Associate Editor of theIEEE Transactions on Systems Man and Cybernetics and The Society for Computer Simulation monthly journalSIMULATION.Dr. Obaidat is on the editorial boards ofIEEE Transactions on Instrumentation and measurementandACM Applied Computing Review.He has guest edited a special issue of theSimulation Journalon high speed networking and another issue on high performance computing. He is listed on who is who in the East of USA. Dr. Obaidat has published over 90 technical refereed articles. His research interests are high performance computing/computers performance evaluation of computer systems and networks parallel computing: architecture and algorithms neural networks computer networks pattern recognition image processing and instrumentation and measurement.

This paper presents a new protocol for token ring local computer networks and its performance for single and dual ring networks using simulation modelling. The proposed protocol is a modification of the IEEE 802.5 token ring standard. In this protocol, a station can start transmission if it receives a free token or a data packet passing its interface logic. Idle stations are skipped whenever there is at least one station that has a ready packet to transmit. This is achieved by using two of the reserved bits in the frame status (FS) field. The bits used are called transmission reservation bits (TR-bits). The TR-bits are reset by the sending station and set by the first station that has data to transmit during the round trip of the associated packet along the ring. It is found that the proposed modified token ring (MTR) protocol provides better throughout and delay performance for both the single and dual ring networks. The reduction in mean delay of the MTR as compared to the standard token ring (STR) reaches about 45 per cent under heavy traffic conditions. Moreover, it is found that the performance of the MTR decreases as the packet size increases but remains higher than the corresponding performance of the STR for both the single and dual ring networks. The MTR provides a maximum throughput improvement of about 6 per cent over the STR for both dual and single ring cases. Finally, the proposed protocol (MTR) is easy to implement, with no extra hardware and has low cost/performance characteristics.

关键词： TOKEN RING LAN PROTOCOLS PERFORMANCE EVALUATION DISCRETE-EVENT SIMULATION

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NONLINEAR SUPERPOSITION FORMULA OF THE BOUSSINESQ HIERARCHY

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Acta Mathematicae Applicatae Sinica 1993年第1期9卷 17-27页

作者：胡星标李勇刘启铭 Computing Center of Academia Sinica Beijing 100080 China Department of Applied Mathematics Tongji University Shanghai 200092 China Department of Mathematics Shanghai University of Science and Technology 201800 Shanghai China

In this paper,a Boussinesq hierarchy in the bilinear form is proposed. A Backlund transformation for this hierarchy is presented and the nonlinear superposition formula is proved rigorously.

关键词： BT DI NONLINEAR SUPERPOSITION FORMULA OF THE BOUSSINESQ HIERARCHY

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Blind estimation of multiple co-channel digital signals arriving at an antenna array

Blind estimation of multiple co-channel digital signals arri...

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Asilomar Conference on Signals, Systems & Computers

作者： S. Talwar M. Viberg A. Paulraj Scientific Computing University of Stanford Stanford CA USA Department of Applied Electronics Chalmers University of Technology Gothenburg Sweden Information Systems Laboratory University of Stanford Stanford CA USA

We propose a novel approach for separating and estimating multiple co-channel digital signals arriving at an antenna array. The spatial response of the antenna array is known imprecisely or unknown. We exploit the discrete-alphabet property of digital signals to simultaneously determine the array response and the bit sequence for each signal. Uniqueness of the estimates is established for signals with BPSK modulation format. This new approach as applicable to an unknown array geometry and propagation environment, which is particularly useful in digital mobile communications. Simulation results demonstrate its promising performance.< >

关键词： Antenna arrays Binary phase shift keying Modulation Geometry Mobile communication

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