E-LETTER on Systems, Control, and Signal Processing ISSUE No. 47, 21 January 1992 Editors: Bradley W. Dickinson bradley@princeton.edu or bradley@pucc.bitnet Eduardo D. Sontag sontag@hilbert.rutgers.edu or sontag@pisces.bitnet ***************************************************************************** * REQUEST TO THOSE SUBMITTING ARTICLES FOR PUBLICATION * * * * Please do NOT send duplicate copies to both editors. This makes the * * already time-consuming task of putting each issue together much harder * * as it requires checking for articles that appear twice. Thanks! * * * * * * Also: Please note the SCAD database update. The lack of submissions * * from our community of electronic copy of preprints for everyone to * * access easily by FTP seems to be in marked contrast with activity in * * many other fields -- does this mean that there is less interest in * * making our results readily available? Or is it an indication of an * * extreme specialization, which leads one to assume that no one else * * is interested? (We welcome mail on this topic --tell us if your * * comments can be used for attribution or not.) SCAD is not really * * difficult to use than email; some helpful suggestions will be found * * in the SCAD update news item. * * * ***************************************************************************** Welcome. We remind you that items for posting can be emailed to either of the editors. PLEASE SEND CONTRIBUTIONS, since the eletter can only be useful if everyone participates. **A REQUEST: It would be useful if articles are already sent in the format that we use, starting with a "Contributed by:..." and a title centered in the next line. In addition, please provide a 60-character title for the Contents. Thanks! NOTE: if you are using an editor to read this mailing and if at any point you wish to skip to the next article, you can accomplish this by searching for the string: *.** Contents Changes to mailing list Personals: People going up Awards and Recognitions Misc SIAM Activity Group in Control and Systems Theory: SIAM Conf on Control & Applics -- Deadline approaching!! IEEE Control Systems Society News: Trans Autom Control News Journals: MCSS TOC: Vol. 5, No. 2 CSSP TOC: Vol. 11, No. 2, 1992 LAA TOC: Volumes 162-164, February 1992 SIAM Journal on Matrix Analysis and Applic 13,2 April 1992 Applied Numerical Mathematics 1992, Vols 9-10 in 12 issues Math and Computers In Simulation 1992 Volume 34 in 6 issues Conferences: IFAC Wrshp: Control Applics Optimization, Sep 2-4, 1992, Munich IMACS 1992 Events 1993 IFAC Congress (Sydney, Australia) 1993 Inform. Theory Symposium, Jan. 17-22, San Antonio, TX Digital Signal Processing Workshop, Sep 13 - 16, 1992, IL, USA Faculty Positions Available/Wanted: Portland State University, Math Dept SCAD Database Update Misc: Ill-conditioned Hinf sample problems solicited. *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by the Editors: Changes/Additions to mailing list. Changes and Updates: ------------------- siam@siam.org (SIAM, Philadelphia, PA) wscoas@win.tue.nl (A.A. Stoorvogel, Eindhoven Univ. of Tech., Netherlands) rajeev@ncr-fc.ftcollins.ncr.com (Rajeev Krishnamoorthy, NCR, Ft. Collins, CO) dee@wldelft.nl (Dick Dee, Delft Hydraulics Inst., the Netherlands) pjf@inesca.pt (Paulo Jorge Ferreira, Univ. de Aveiro, Portugal) thistle@eclair.berkeley.edu (John Thistle, Univ. of California, Berkeley) Additions: --------- vijay@envy.cs.umass.edu (Vijaykumar Gullapalli, Univ. of Massachusetts, Amherst) chuanyi@ecse.rpi.edu (Chuanyi Ji, Rennselaer Polytechnic Inst., Troy, NY) prasanth@gn.ecn.purdue.edu (Ravi K. Prasanth, Purdue Univ., W. Lafayette, IN) fcchen@cc.nctu.edu.tw (Fu-Chuang Chen, National Chiao Tung Univ., Taiwan) goh@maths.uwa.oz.au (C.J. Goh, Univ. of Western Australia) kraft@maschinenbau.fh-muenchen.dbp.de (Dieter Kraft, Fachhochsch., Muenchen) ilyes@csvaxe.csuohio.edu (Laszlo Ilyes, Cleveland State Univ., OH) liu@csvaxe.csuohio.edu (Zhi-jun Liu, Cleveland State Univ., OH) samuel@syscon.sc.ee.unsw.oz.au (Samuel Ginting, Univ. of N.S.W., Australia) getz@robotics.berkeley.edu (Neil Getz, Univ. of California, Berkeley) checinar@minna.iit.edu (Ali Cinar, Illinois Inst. of Technology, Chicago) kaoci@system.es.ncku.edu.tw (Cheng-I Kao, National Cheng Kung Univ., Taiwan) gordon@tramp.colorado.edu (Allen Gordon, Univ. of Colorado, Boulder) posner@ee.princeton.edu (Eli Posner, Princeton Univ.) horn@hrl.harvard.edu (Charles Horn, Harvard Univ.) hausen@dbngmd21.bitnet (H. Ludwig Hausen, GMD, Sankt Augustin, Germany) iddo@taux01.nsc.com (Iddo Carmon, National Semiconductor of Israel) ketchum@anubis.network.com (Bret Ketchum) othon@grathun1.bitnet (George Glentis, Univ. of Athens, Greece) mire@isi.com (Mireille Broucke, Integrated Systems, Santa Clara, CA) *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by the Editors -- PERSONALS ********** PEOPLE GOING UP ************ (1) New Fellows of the IEEE in 1992: The following E-Letter readers were among those who were recently named Fellows of the IEEE. Please let us know if there are other E-Letter readers whom we should also mention. Jurgen Ackermann A. C. Antoulas Jan Biemond Rama Chellappa Joe Chow Jerry Gibson Biing-Hwang Juang David Limebeer R. V. Patel Paul Prucnal Stuart Schwartz Kang Shin Donald Wiberg (2) Harris McClamroch has been appointed Chair of the Department of Aerospace Engineering at the University of Michigan, Ann Arbor, MI, effective January 1st, 1992. (3) Professor Raymond Hanus from the Free University of Brussels is now IMACS Secretary General. His address is : IMACS Free University of Brussels Automatic Control CP 165 50, av. F.D. Roosevelt B-1050 BRUSSELS - BELGIUM phone : +32.2.650.2675 fax : +32.2.650.2677 e-mail : ********** AWARDS AND RECOGNITION ************ Sergio Verdu and Anthony Ephremides have been named co-recipients of the IEEE's 1992 Donald G. Fink Prize Award for their paper Control and Optimization Methods in Communication Network Problems. The paper appeared in the IEEE Trans. on Automatic Control, AC-34, September 1989, pp. 930-942. ******* MISC ****** Congratulations to Bruce Francis and Wang Jingwen who were married on Nov 6, 1992! ******* send us more information for the gossip column!!! ******* *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: KEVIN A. GRASSE (KGRASSE@nsfuvax.math.uoknor.edu) SIAM Activity Group in Control and Systems Theory: Reminder: SIAM Conference on Control and its Applications **** DEADLINE APPROACHING !!! **** ****** NOTE: ABSTRACTS CAN BE SUBMITTED BY ELECTRIONIC MAIL ******** (See instructions below) September 17-19, 1992 Radisson Hotel Metrodome Minneapolis, Minnesota, USA SCOPE AND AIMS OF THE CONFERENCE The SIAM Activity Group on Control and Systems Theory is pleased to announce a conference on control theory and its applications, to be held in Minneapolis, Minnesota, USA, on September 17-19, 1992. Minneapolis is the location of the Institute for Mathematics and Applications (IMA), which will be conducting a special year in Control Theory and Its Applications during the 1992-1993 academic year. The conference will cover a broad range of topics that are of current interest in control theory and will bring together researchers in control theory and its applications from academe, industry, and the government. The conference will include plenary and simultaneous one-hour lectures, minisymposia, and sessions for contributed papers. See details in Eletter 43 or contact K. A. Grasse by electronic mail at: kgrasse@nsfuvax.math.uoknor.edu or by ordinary mail at the following address: Professor Kevin A. Grasse Department of Mathematics University of Oklahoma Norman, OK 73019 USA Abstracts are due at SIAM by February 14th, 1992. (fax: +1 215-386-7999) NOTE: ABSTRACTS CAN BE SUBMITTED BY ELECTRONIC MAIL: Your abstract should have the form shown below. Please e-mail to: meetings@siam.org (Please ask for acknowledgement of receipt) % This is ltexconf.tex. Use this file as an example file for doing an SIAM % Conference abstract in LaTeX. \documentstyle{report} \hsize=25.5pc \vsize=50pc \textheight 50pc \textwidth 25.5pc \parskip 0pt \parindent 0pt \pagestyle{plain} \def\title#1{\bf{#1}\vspace{6pt}} \def\abstract#1{\rm {#1}\vspace{6pt}} \def\author#1{\rm {#1}\vfill\eject} \begin{document} \title{Major New Results in Control Theory} \abstract{This paper solves all open problems in control theory. This abstract is 100 words in length, at most.} \author{\underbar{Joe E. Eletter}\\ Smart University, This City, OM, USA} \end{document} % end of example file. %PLEASE FILL-IN as appropriate, and include here in email: 1. Conference: SIAM Conference on Control and its Applications Minneapolis, Minnesota, Sept. 17-19, 1992 2. Type: Contributed paper (if Minisymposium, say so) 3. Equipment for Visual Support: Overhead Projector [Or whatever you need] 4. If you are a speaker in a minisymposium, who is the organizer? (Name if appropriate) 5. What is the minisymposium title? (Fill if appropriate) *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: Harris McClamroch (mcclamroch@um.cc.umich.edu) Control Systems Society News New appointments to the IEEE Transactions Editorial Board for 1992 have been approved by the Control Systems Society Board of Governors. New appointments for 1992 are: Associate Editors: A. M. Annaswamy (MIT) C. DeMarco (U. Wisconsin) J. S. Gibson (UCLA) J. B. Lasserre (LAAS, France) S. P. Meyn (U. Illinois) P. J. Ramadge (Princeton) Associate Editor for Book Reviews: D. S. Naidu (Idaho State U.) Associate Editors at Large: M. Morari (Cal Tech) D. M. Wiberg (UCLA) In addition, the Board of Governors has approved the following appointments which are to be effective July 1, 1992: Editor in Chief: J. Baillieul (Boston U.) Editor for Conference Publications: M. P. Polis (Wayne State U.) Editor for Technical Notes and Correspondence: T. Basar (U. Illinois) *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: the editors MATHEMATICS OF CONTROL, SIGNALS, AND SYSTEMS Vol. 5, No. 2 Contents Topological Aspects of the Partial Realization Problem W. Manthey, U.Helmke, and D. Hinrichsen An Algebraic Approach to Supervisory Control K. Inan Stable Hermitian Solutions of Discrete Algebraic Riccati Equations A.C.M. Ram and L. Rodman Continuous Dependence of Solutions to the Lyapunov Equation Relative to an Elliptic Differential Operator of Order 2 T. Nambu Optimality Conditions for Impulsive Control of Piecewise-Deterministic Processes D. Gatarek *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: zeman@sbee.eng.sunysb.edu (Prof. Armen H. Zemanian) Table of contents for: CIRCUITS, SYSTEMS, AND SIGNAL PROCESSING Vol. 11, No. 2, 1992 Birkhauser-Boston, Inc. 675 Massachusetts Avenue, Suite 601 Cambridge, MA 02139-3309 (617) 876-2333 On construction of coprime factorizations for nonlinear feedback control systems, Guanrong Chen and Rui J. P. de Figueiredo Elimination of the nonminimum-phase problem at major sampling intervals, Zhihua Qu, Qiren Zhang and John Dor Losslessness and stability of LDI ladders and filters, Yuval Bistritz On the convergence rate of s-numbers of compact Hankel operators, C. K. Chui, X. Li and J. D. Ward *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: Richard A. Brualdi Topic: Contents of Volumes 162-164 of LAA, February 1992 DIRECTIONS IN MATRIX THEORY: THE FOURTH AUBURN LINEAR ALGEBRA CONFERENCE MARCH 20-23, 1990 Special Editors: David H. Carlson and Frank Uhlig Ky Fan (Santa Barbara, California) Some Aspects of the Development of Linear Algebra in the Last Sixty Years 15 Robert C. Thompson (Santa Barbara, California) High, Low, and Quantitative Roads in Linear Algebra 23 Richard A. Brualdi (Madison, Wisconsin) The Symbiotic Relationship of Combinatorics and Matrix Theory 65 P. A. Fuhrmann (Beer Sheva, Israel) Functional Models in Linear Algebra 107 Lothar Reichel (Kent, Ohio) and Lloyd N. Trefethen (Ithaca, New York) Eigenvalues and Pseudo-eigenvalues of Toeplitz Matrices 153 John Drew, Charles R. Johnson (Williamsburg, Virginia), and P. van den Driessche (Victoria, British Columbia, Canada) Strong Forms of Nonsingularity 187 Thomas J. Laffey (Dublin, Ireland) A Structure Theorem for Some Matrix Algebras 205 Chi-Kwong Li (Williamsburg, Virginia) and Nam-Kiu Tsing (College Park, Maryland) Linear Preserver Problems: A Brief Introduction and Some Special Techniques 217 Stephen Pierce (San Diego, California) Linear Maps on Algebraic Groups 237 E. Anderson (Eagan, Minnesota), Z. Bai (Lexington, Kentucky), Land J. Dongarra (Knoxville, Tennessee) Generalized QR Factorization and Its Applications 243 H. Lev-Ari and T. Kailath (Stanford, California) State-Space Approach to Factorization of Lossless Transfer Functions and Structured Matrices 273 Graciano de Oliveira (Macau) Interlacing Inequalities. Matrix Groups 297 George Poole and Larry Neal (Johnson City, Tennessee) Gaussian Elimination: When Is Scaling Beneficial? 309 D. R. Farenick (Toronto, Ontario, Canada) Krein-Milman-Type Problems for Compact Matricially Convex Sets 325 Bryan L. Shader (Madison, Wisconsin) On Tournament Matrices 335 Ahmad Muchlis (Madison, Wisconsin) On The Extremal Points of a Class of Polytopes of Matrices 369 Eric Kostlan (Honolulu, Hawaii) On the Spectra of Gaussian Matrices 385 A. I. Tovbis (Odessa, USSR) Normal Forms of Holomorphic Matrix-Valued Functions and Corresponding Forms for Singular Differential Operators 389 Dennis Bernstein (Ann Arbor, Michigan) Some Open Problems in Matrix Theory Arising in Linear Systems and Control 409 S. Galanis, A. Hadjidimos, D. Noutsos, and M. Tzoumas (Ioannina, Greece) On the Optimum Relaxation Factor Associated With p-Cyclic Matrices 433 Jean-Claude Evard and Frank Uhlig (Auburn, Alabama) On the Matrix Equation f(X)=A 447 A. C. M. Ran (Amsterdam, The Netherlands) Unitary Solutions of a Class of Algebraic Riccati Equations and Factorization 521 Charles R. Johnson (Williamsburg, Virginia) and Michael Lundquist (Prova, Utah) An Inertia Formula for Hermitian Matrices With Sparse Inverses 541 Julian Laderman, Victor Pan (Bronx, New York), and Xuan-He Sha (New York, New York) On Practical Algorithms for Accelerated Matrix Multiplication 557 LeRoy B. Beasley and Sang-Gu Lee (Logan, Utah) Linear Operators Strongly Preserving r-Potent Matrices Over Semirings 589 Charles R. Johnson (Williamsburg, Virginia) and Erik A. Schreiner (Kalamazoo, Michigan) Explicit Jordan Form for Certain Block Triangular Matrices. II 601 Gin-Hor Chan (Singapore) and Ming-Huat Lim (Malaysia) Linear Preservers on Powers of Matrices 615 Walter Morris (Fairfax, Virginia) The Connected Components of the Set of R0-Matrices 627 Thomas H. Pate (Auburn, Alabama) Descending Chains of Immanants 639 Jean H. Bevis and Frank J. Hall (Atlanta, Georgia) LDLT Factorizations of Adjacency Matrices Where D Is Block Diagonal 651 Yiu Tung Poon (Ames, Iowa) The Convexity of a Generalized Matrix Range 663 Wayne W. Barrett and Tyler J. Jarvis (Provo, Utah) Spectral Properties of a Matrix of Redheffer 673 Elena Sanchez, Vicente Hernandez, and Rafael Bru (Valencia, Spain) Minimal Realizations for Discrete-Time Linear Periodic Systems 685 Frank Uhlig, Tin-Yau Tam (Auburn, Alabama), and David Carlson (San Diego, California) REPORT: Directions in Matrix Theory, Auburn 1990, Conference Report 711 Author Index 799 *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: SIAM@SIAM.ORG SIAM Journal on Matrix Analysis and Applications Volume 13, Number 2 April 1992 A Chart of Numerical Methods for Structured Eigenvalue Problems Angelika Bunse-Gerstner, Ralph Byers, and Volker Mehrmann A Sharp Bound on Positive Solutions of Linear Diophantine Equations I. Borosh and L. B. Treybig Optimal and Superoptimal Circulant Preconditioners Evgenij E. Tyrtyshnikov Perturbation of the Eigenvalues of Quadratic Matrix Polynomials H. Langer, B. Najman, and K. Veselic A Look-Ahead Levinson Algorithm for Indefinite Toeplitz Systems Tony F. Chan and Per Christian Hansen An Eigenvalue Region for Leslie Matrices Steve Kirkland On Inversion of Symmetric Toeplitz Matrices Leiba Rodman and Tamir Shalom Cyclic Strong Ergodicity in Nonhomogeneous Systems Ioannis I. Gerontidis Reduction to Tridiagonal Form and Minimal Realizations Beresford Parlett A Completed Theory of the Unsymmetric Lanczos Process and Related Algorithms, Part I Martin H. Gutknecht Matrices with Positive Definite Hermitian Part: Inequalities and Linear Systems Roy Mathias QR-Like Algorithms for Symmetric Arrow Matrices Peter Arbenz and Gene H. Golub A Sherman-Morrison-Woodbury Identity for Rank Augmenting Matrices with Application to Centering Kurt S. Riedel On the Relationship between Overlapping and Nonoverlapping Domain Decomposition Methods Tony F. Chan and Danny Goovaerts Two-Stage and Multisplitting Methods for the Parallel Soution of Linear Systems Daniel B. Szyld and Mark T. Jones *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by : Raymond Hanus IMACS 1992 Journals APPLIED NUMERICAL MATHEMATICS 1992 Volumes 9-10 in 12 issues Editors-in-Chief : R. Vichnevetsky, Dept. of Computer Science, Rutgers University, New Brunswick, NJ 08903, USA, J.E. Flaherty, Dept. of Computer Science, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; Topical Editor for Approximation Theory : C. Brezinsky Topical Editor for Parallel Numerical Computing : J. Saltz Topical Editor for Initial Value Methods for PDEs : J.G. Verwer Applied Numerical Mathematics is an established journal devoted to contemporary problems in numerical computing. A feature of the journal is that every complete volume is composed of both general issues of contributed papers and special issues devoted to particular topics. These topics are chosen to highlight important areas of computational mathematics that have broad appeal in the computational mathematics community. The journal strives to be flexible in the type and format of papers it publishes. Subscription information : IMACS Member Subscription price : 2 325 BEF IMACS-European Members Automatic Control ULB CP 165 50, av. F.D. Roosevelt B-1050 BRUSSELS - BELGIUM MATHEMATICS AND COMPUTERS IN SIMULATION 1992 (Transactions of IMACS) Volume 34 in 6 issues Editor-in-Chief : R. Vichnevetsky, Department of Computer Science, Rutgers University, New Brunswick, NJ 08903, USA The aim of the journal is to provide an international forum for the dissemination of up-to-date information in the field of the Computer Simulation of Systems. Published material ranges from short, concise research papers to more general tutorial articles. Mathematics and Computers in Simulation, published bimonthly, is the official organ of the International Association for Mathematics and Computers in Simulation (formerly AICA). Topics covered by the journal include : - mathematical tools in the foundations of systems modelling - specific applications in science and engineering - numerical analysis and the development of algorithms for simulation - considerations about hardware for simulation (digital, analog and hybrid) - special software and compilers - the general philosophy of systems simulation, and its impact on disciplinary and interdisciplinary research. The journal also includes a bibliography and book review section. Subscription information : IMACS Member Subscription price : 1 500 BEF IMACS-European Members Automatic Control ULB CP 165 50, av. F.D. Roosevelt B-1050 BRUSSELS - BELGIUM *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: kraft@maschinenbau.fh-muenchen.dbp.de ====================================== FIRST ANNOUNCEMENT AND CALL FOR PAPERS -------- 9th IFAC WORKSHOP --------- CONTROL APPLICATIONS OF OPTIMIZATION ==================================== September 2-4, 1992, Munich Sponsored by IFAC-International Federation of Automatic Control Technical Committee on Mathematics of Control Working Group on Control Applications of Optimization Organized by FHM-Fachhochschule Muenchen Department of Mechanical Engineering Laboratory of Control and Automation on behalf of VDI/VDE (GMA) Gesellschaft fuer Mess- und Automatisierungstechnik International Program Committee: R. Bulirsch (D, Chairman) H.G. Bock (D) J.F. Bonnans (F) A.E. Bryson (USA) L.C.W. Dixon (UK) G. Feichtinger (A) H.P. Geering (CH) T. Glad (S) J.L. de Jong (NL) F.M. Kirillova (GUS) D.Q. Mayne (UK) A. Miele (USA) H.J. Oberle (D) G. di Pillo (I) J.L. Speyer (USA) Ph. Toint (B) I. Troch (A) K.H. Well (D) SCOPE: ====== Resources should be used sparingly both from a point of view of economy and ecology. Thus in controlling industrial, economical and social processes optimization is the tool of choice. The objective of the workshop is to bring together experts in control and optimization from research and industry to exchange ideas, experiences and future developments in control applications of optimization. There should be a genuine feedback loop between mathematicians, computer scientists, engineers, and software developers including design and application of algorithms and implementations. Therefore industrial appliers are especially invited. TOPCIS: ======= * Nonlinear Programming - Interior Point Methods - Large Structured Problems - Nonsmooth Problems - Vector-Valued Criteria * Optimal Control - Boundary Value Problems - State and Control Constraints * Optimization-Based Control System Design * Applied to Models and Systems from the Field of - Control Engineering - Aerospace Engineering - Process Control - Path Planning and Control of Robots - Transportation Systems Engineering HISTORY: ======== The workshop is the ninth one in a series of very successful biennial meetings starting at a JACC Conference in Denver in 1978. The succeeding meetings took place either in important metropoles or in marvelous countrysides: London, Oberpfaffenhofen, San Francisco, Capri, Tbilisi, Paris. CONTRIBUTIONS: ============== The workshop will consist of nine 90-minutes sessions. The presentations will be given in form of lectures and minisymposia. Each minisymposium may focus on any topic of the workshop and will illuminate the chosen topic from different point of views. Each minisymposium fills one session and consists of three or four contributions. There will be four invited lectures (40 minutes) and one invited minisymposium. The other presentations are contributed lectures (15 minutes oral presentation, 5 minutes discussion) and contributed minisymposia. ABSTRACTS: ========== If you want to contribute a lecture or organize a minisymposium, please submit a two-page abstract (approx. 600 words) containing title, authors address (including phone, fax, e-mail), relevance with respect to workshop topics, state of the art, new contribution, application, reference to full paper. Abstracts are necessary for each contribution to a minisymposium. The abstracts of the accepted contributions will be distributed to all participants at the beginning of the workshop. The language of the oral and written contributions to the workshop will be English. SCHEDULE: ========= Deadline for Abstracts ..................... March 31, 1992 Notification of Selected Presentation ...... April 30, 1992 Preliminary Program and Registration ....... May 31, 1992 NEIGHBOURING EVENTS: ==================== 4th IMACS Symposium on Systems Analysis and Simulation, Berlin Aug. 27-Sept. 2, 1992 12th IFAC Symposium on Automatic Control in Aerospace, Ottobrunn Sept. 7-11, 1992 4th IFAC Workshop on Spacecraft Automation and Mission Control, Darmstadt Sept. 14-16, 1992 INFORMATION: ============ Dr. Dieter Kraft Fachhochschule Munich Dachauerstrasse 98 b D-8000 Munich 2 Federal Republic of Germany Tel. 0049 89 1265 1108 or 0049 8153 2493 Fax. 0049 89 1265 1392 e-Mail: kraft@maschinenbau.fh-muenchen.dbp.de LaTeX-file for application: =========================== \documentstyle[12pt]{article} \pagestyle{empty} \parindent0pt \addtolength{\topmargin}{-25mm} \addtolength{\textheight}{+25mm} \begin{document} {\bf IFAC-Workshop on \\[1mm] CONTROL APPLICATIONS of OPTIMIZATION\\[1mm] Return Card} \quad (Please print and indicate) \vspace{3mm} I am interested in giving a contributed lecture\\[1mm] Enclosed is a two-page abstract A two-page abstract will be mailed under seperate cover \vspace{2mm} I am interested in organizing a minisymposium\\[1mm] Enclosed are three or four two-page abstracts The corresponding abstracts will be mailed under seperate cover; the contributors to the minisymposium are:\\[3mm] .\dotfill .\dotfill .\dotfill \vspace{2mm} I am interested in attending the workshop\\[1mm] Please send me advance registration and preliminary program \vspace{3mm} Name\dotfill\\[3mm] Title\dotfill\\[3mm] Organization\dotfill\\[3mm] Department\dotfill\\[3mm] Address\dotfill\\[3mm] City\dotfill\\[3mm] Country\dotfill\\[3mm] Phone\dotfill Fax\dotfill\\[3mm] e-Mail\dotfill% \vspace{3mm} Return to: Dr. Dieter Kraft Fachhochschule Munich Dachauerstrasse 98 b D-8000 Munich 2 Federal Republic of Germany Tel. 0049 89 1265 1108 Fax. 0049 89 1265 1392 e-Mail: kraft@maschinenbau.fh-muenchen.dbp.de \end{document} *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by : Raymond Hanus IMACS 1992 Events IMACS SYMPOSIUM ON SYMBOLIC COMPUTATION IN ENGINEERING DESIGN Date : 1992 Place : IDN, Lille, France For further information contact : Prof. Pierre Borne, BP 48, Institute Industriel du Nord, 59651 Villeneuve d'Ascq Cedex, France 1992 IFAC/IFIP/IMACS INTERNATIONAL SYMPOSIUM ON ARTIFICIAL INTELLIGENCE IN REAL-TIME CONTROL Date : June 16-18, 1992 Place : Delft University of Technology, Delft, The Netherlands Scope : This symposium is the continuation of a series of 3 very successful workshops in this field. The scope of this symposium includes the use of artificial intelligence in the design, implementation, testing, maintenance, supervision and monitoring of real-time control systems. The objective of the symposium is to bring together control systems specialists, artificial intelligence specialists and end-users. The technical program will include plenary survey papers, invited sessions and regular sessions. Deadlines : Submission of abstracts and draft papers : November 1, 1991 Notification of acceptance : January 1992 Submission of final paper : March, 1992 For further information contact : AIRTC 1992, Congress Office KIVI, P.O.Box 30424, 2500 GK The Hague, The Netherlands. Fax : (31) 703919840 IMACS/SICE INTERNATIONAL SYMPOSIUM ON ROBOTICS, MECHATRONICS AND MANUFACTURING SYSTEMS IMACS/SICE RM2S '92 KOBE Date : September 16-20, 1992 Place : The Kobe Chamber of Commerce & Industry - Kobe, Japan Organized by : IMACS TC-14 on Control Systems and Robotics and SICE). The aim of RM2S '92 is to provide a forum for the presentation and discussion of the recent advance of Robotics, Mechatronics and Manufacturing Systems. For further information contact : Prof. T. Takamori, Dept. of Instrumentation Engineering, Faculty of Engineering, Kobe University, Rokkodai 1-1, Nada, Kobe 657, Japan. Telephone : (078) 861-8099 or Prof. S. Tzafestas, Intelligent Robotics and Control Unit, Computer Science Division, National Technical University of Athens, Zografou 15773, Athens, GREECE. Fax : 30-1-7757504 2ND BEIJING INTERNATIONAL CONFERENCE ON SYSTEM SIMULATION AND SCIENTIFIC COMPUTING - BICSC '92 Date : October 20-23, 1992 Place : Beijing, China (Co-sponsored by IMACS) The scope of the meeting includes : System simulation methodology and modelling; simulation software and simulation computer system; simulator; application of simulation technology to engineering and nonengineering areas; computer aided control system design and its application. Deadlines : Submission of summaries : September 30, 1991 Notification of acceptance : December 30, 1991 Camera ready paper due : April 30, 1992 All submissions, inquires and information should be addressed to: Prof. Chen Zong Ji, Dept. of Control Engineering, Beijing Univ. of Aeronautics & Astronautics, Beijing 100083, P.R. China. Telex : 222700 BUAA CN Fax : 86-1-2015347 *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by A.H. Haddad 1993 IFAC Congress Calls for Papers for the 1993 IFAC Congress in Sydney, Australia are now available. In the USA copies of the announcements may be obtained from AACC Secretariat c/o A. Haddad at ahaddad@eecs.nwu.edu or Fax 708-491-3641. If you need a number of copies to distribute to colleagues or at a conference or workshop that you may be holding, please indicate the number required. *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: Galen Sasaki (ghs@emx.utexas.edu) FINAL CALL FOR PAPERS 1993 IEEE International Symposium on Information Theory Hilton Palacio del Rio Hotel, San Antonio, Texas, USA January 17-22, 1993 The 1993 IEEE Internation Sympsium on Information Theory will be held at the Hilton Palacio Del Rio Hotel in San Antonio, Texas, USA from Sunday evening, January 17, 1993, through Friday afternoon, January 22, 1993. Papers presenting new results in the following areas are solicited: * Applications of information theory * Image and speech coding * Communication systems * Muti-user information theory * Cryptography and security * Neural networks * Data compression * Optical communications * Data networks * Pattern recognition * Detection and estimation * Shannon theory * Distributed information processing * Signal processing * Error-control coding * Source coding * Stochastic processes Both long (40 minutes) and short (20 minutes) papers will be accepted. Long Papers will be reviewed on the basis of a complete manuscript; the deadline for submission of these is June 1, 1992. Short Papers will be reviewed on the basis of a 500 word summary; the deadline for submission of these is July 1, 1992. Either type of submission should be accompanied by an Abstract of no more than 180 words, suitable for inclusion in the Symposium Proceedings, and an indication of the technical area in which it should be reviewed. A manuscript submitted as a Long Paper, but which cannot be accomodated in that category, will be considered for acceptance as a Short Paper, unless the author directs otherwise. Acceptance will be announced by October 15, 1992. All submitted papers and summaries should be sent in triplicate to the Program Chairman: Richard E. Blahut: Mail Drop 0600 IBM Corporation Route 17C Owego, New York 13827 USA A limited number of grants may be available for authors of accepted papers whose resources will not enable them to attend the Symposium. Inquiries on the matters related to the Symposium should be addressed to one of the Symposium Co-Chairmen: Professor Robert M. Gray: Electrical Engineering Department Durand 133 Stanford University Stanford, California 94305 USA gray@isl.stanford.edu Professor Jerry D. Gibson: Department of Electrical Engineering Texas A&M University College Station, Texas 77834 USA gibson@ee.tamu.edu *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by K.S. Arun FIFTH DIGITAL SIGNAL PROCESSING WORKSHOP September 13 - 16, 1992 Starved Rock Lodge, Starved Rock State Park, IL CALL FOR PAPERS The Fifth Digital Signal Processing Workshop, sponsored by the IEEE Signal Processing Society will be held in the fall of 1992 in the lodge at Starved Rock State Park, Illinois. The lodge is located approximately 80 miles from Chicago and is accessible by car from Chicago's O'Hare airport. Papers are solicited for technical poster sessions on the following topics: . Time-Frequency and Wavelet Representation . Nonlinear Systems, Chaos, and Fractals . Signal Recontruction and Estimation . Adaptive Filtering and Beamforming . DSP Algorithms and Architectures . Statistical Signal Processing . Applications of DSP Prospective authors are invited to send four copies of camera-ready, two-page paper summaries to Technical Program Chairman: Robert A. Gabel Room M-203 MIT Lincoln Laboratory Lexington, MA 02173-9108. The top of the first page of the summary should include a title and the names, affiliations, addresses, and telephone numbers of the authors. Summaries of accepted papers will form the published workshop proceedings. All contributed technical sessions will be poster sessions. In addition, the workshop will include a number of invited plenary talks on topics of general interest. Deadlines: Submission of two-page summary : May 1, 1992 Notification of acceptance : June 15,1992 Rates: Early registration (before August 1, 1992) : $120 Late registration (after August 1, 1992) : $130 Room and board (single) : $110/night Room and board (double) : $85/night. More information regarding the workshop can be obtained from any of the following persons. General Chairman: Mark J. T. Smith School of Elec. Engg. Georgia Inst. of Technology Atlanta, GA 30332-0250 Local Arrangements Chairman: Barry Sullivan Ameritech Science and Tech. Center 2000 W. Ameritech Center Drive, C354 Hoffman Estates, IL 60196-1025 Publicity Chairman: K. S. Arun Coordinated Science Laboratory University of Illinois Urbana, IL 61801. *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: gerardo@gemini.mth.pdx.edu (Gerardo Lafferriere) PORTLAND STATE UNIVERSITY, Math position (control included) Portland, Oregon Possible tenure track position at the assistant professor rank starting September 1992. Applicants sought whose research is in one of the areas of current interest in the department such as control theory and numerical methods, Lie groups, differential geometry, and low dimension topology. Candidates must have a PhD or equivalent, show an ability to conduct a strong research program including refereed publications, and have a record of excellent teaching. Send a c.v. and have at least three letters of reference sent directly to Search Committee, Department of Mathematical Sciences, PO Box 751, Portland State University, Portland, OR, 97207-0751. Consideration of applications will begin on February 15, 1992. Portland State is an Affirmative Action/Equal Opportunity Employer. Minorities and women are especially urged to apply. --Gerardo Lafferriere *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: Raimund J. Ober UPDATE ON SCAD DATABASE -- ******************************************************************************* #### #### ## ##### # # # # # # # #### # # # # # # # ###### # # # # # # # # # # #### #### # # ##### Systems and Control Archive at Dallas ftp address: ftp.utdallas.edu IP number: 129.110.10.11 queries: ober@utdallas.edu ****************************************************************************** New contents: ============= The following scad directories contain new material: eletters: - eletter issues: 44, 45-1, 45-2, 46 preprints: - subdirectory `syconreports': -- Abstracts of the reports of the Rutgers Center for Systems and Control (Sycon) year 91 (91abstracts.latex). -- Sycon reports: 91-11, 91-12. Report 91-11; (sycon-91-11.ps.Z) On the computational power of neural nets, Hava T. Siegelmann and Eduardo D. Sontag. (17+i pp.) This paper deals with the simulation of Turing machines by neural networks. Such networks are made up of interconnections of synchronously evolving processors, each of which updates its state according to a ``sigmoidal'' linear combination of the previous states of all units. The main result states that one may simulate all Turing machines by nets, in linear time. In particular, it is possible to give a net made up of about 1,000 processors which computes a universal partial-recursive function. Report 91-12; (sycon-91-12.ps.Z) Universal nonsingular controls, Eduardo D. Sontag. (4+i pp.) In this note we prove that, for analytic systems that satisfy the strong accessibility rank condition, generic inputs produce nonsingular trajectories. A technique for controlling systems without drift is an easy consequence. - P.A. Fuhrmann; R.J. Ober: A functional approach to LQG balancing. (fuhrmann.lqg.dvi.Z) The paper contains a detailed study of model reduction and robust control problems from the point of view of Hankel operators and balanced realizations; 132 pages; To appear in International Journal of Control Report No. 207, University of Texas at Dallas, MMS submitted to SCAD: 7 November 1991 *********** Remember to send your tech reports and other material! ********* How to access scad: =================== Scad can be accessed using ftp. The ftp address is: ftp.utdallas.edu (IP number: 129.110.10.11) You simply type: ftp ftp.utdallas.edu or: ftp 129.110.10.11 When asked for your name, type: anonymous When asked for your password, type your emailaddress: me@mymachine.myuniversity To get to scad type: cd pub/scad To get more info about scad get the README file and examine it on your machine: get README To see the directories in scad type: dir To change to (e.g.) conferences: cd conferences To see the subdirectories: dir To change to the CDC91 subdirectory: cd 91cdc-prog To examine this directory: dir To get a file, type e.g.: get AdvPrgmFinal-Wed.txt To finish the session: quit What follows is an example of such a session: ftp ftp.utdallas.edu Connected to ASPEN.UTDALLAS.EDU. 220 aspen.utdallas.edu FTP server (Version 5.64) ready. Name (ftp.utdallas.edu:joe): anonymous 331 Guest login ok, please send your e-mail address as a password. Password: 230 Guest login ok, access restrictions apply. ftp> cd pub/scad/conferences/91cdc-prog 250 CWD command successful. ftp> get README 200 PORT command successful. 150 Opening ASCII mode data connection for README (77 bytes). 226 Transfer complete. local: README remote: README 79 bytes received in 0.04 seconds (1.9 Kbytes/s) ftp> get AdvPrgmFinal-Wed.txt 200 PORT command successful. 150 Opening ASCII mode data connection for AdvPrgmFinal-Wed.txt (44311 bytes). 226 Transfer complete. local: AdvPrgmFinal-Wed.txt remote: AdvPrgmFinal-Wed.txt 45857 bytes received in 7.3 seconds (6.1 Kbytes/s) ftp> get AdvPrgmFinal-Th.txt 200 PORT command successful. 150 Opening ASCII mode data connection for AdvPrgmFinal-Th.txt (42454 bytes). 226 Transfer complete. local: AdvPrgmFinal-Th.txt remote: AdvPrgmFinal-Th.txt 43909 bytes received in 20 seconds (2.1 Kbytes/s) ftp> get AdvPrgmFinal-F.txt 200 PORT command successful. 150 Opening ASCII mode data connection for AdvPrgmFinal-F.txt (42111 bytes). 226 Transfer complete. local: AdvPrgmFinal-F.txt remote: AdvPrgmFinal-F.txt 43571 bytes received in 7 seconds (6.1 Kbytes/s) ftp> quit MORE INFO: There is README file in /pub/scad which contains more info on how to submit material to SCAD. *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** It is easy to store things in SCAD: if using a Unix system, just have a file with the following contents (let's say the file is called "putscad"), and remember to make the file executable ("chmod u+x putscad"). Now just issue the command "putscad foo.tex" to have your paper "foo.tex" in SCAD. File with script: ---------------------------- cut here --------------------- #!/bin/sh ######################################################################## # usage: put-in-scad # # A Script to put files in Inbox of SCAD archive # ######################################################################## if [ "$1" = "" ] ; then echo usage: $0 "" exit fi echo Will put file $1 in SCAD input directory echo Please notify SCAD administrator of title and abstract echo Please hit return when asked for password echo cat> .ftp.script < ftp.log rm -f .ftp.script echo "Done" ---------------------------- cut here --------------------- *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** Contributed by: Pascal Gahinet ILL-CONDITIONED HINF SAMPLE PROBLEMS SOLICITED ---------------------------------------------- Various numerical difficulties are encountered in state-space Hinf design. Some are tied to the inherent limitations of available methods (nearly ``singular'' problems) while others are purely numerical (poor scaling, sensitivity of the algorithms,...). In order to identify all such difficulties, sort between them and test various remedies, we would like to collect problems on which existing tools perform poorly. Under scrutiny are the algorithms for Linf norm computation, gamma-iteration, and computation of the central controller. Criteria of ``poor performance'' include failure, meaningless answers, wrong diagnosis, and sensitivity to small parameter variation. Of particular but not exclusive interest are problems where: * the outcome critically depends on the tolerances used for the various tests, e.g., the tolerance used to detect imaginary axis eigenvalue(s) of Hamiltonian matrices in the computation of the Linf norm of a transfer function. * the choice of Riccati solver (Schur vectors or eigenvectors) makes a significant difference. * the closed-loop system ``plant + central controller'' is only marginally stable and/or does not satisfy the gamma-attenuation constraint. Submitted problems may come from any Hinf related design (mixed sensitivity, mu-synthesis,...). To allow meaningful analysis and comparison, the (augmented) plant data should be precisely specified, preferably via the matrices A, B1, B2, C1, C2, D11, D12, D21 of Doyle/Glover's 1989 TAC paper. In addition, a README file should explain the nature of the difficulty encountered and the algorithm or packaged used. When possible, a global description of the underlying design problem would also be appreciated. Thanks in advance, P. Gahinet (gahinet@colorado.inria.fr) INRIA 78153 Le Chesnay Cedex, France *.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.** End of Eletter 47, 21 January 1992