**Today's Topics:**

- Bristol-Bath Numerical Analysis Day
- Positions at University of Iowa
- Report from Eight Parallel Circus
- Call for Articles for SIAM News
- Two Meetings in Barcelona
- Automatic Differentiation of Algorithms
- SIAM Journal on Control and Optimization
- SIAM Journal on Mathematical Analysis
- SIAM Journal on Numerical Analysis

From: A. Wathen <maajw@np1a.bristol.ac.uk>

Date: Wed, 7 Nov 90 14:49:25 GMT

BRISTOL-BATH NUMERICAL ANALYSIS DAY, December 17

to be held in Lecture Theatre SM2, School of Mathematics,

University Walk, Bristol, UK on Monday 17th December 1990.

All are invited to attend this informal (and free!) set of

talks on current research to be given by members of the

Universities of Bristol and Bath and by our guest speaker,

Professor Gene Golub of Stanford University, California.

The meeting will begin at 10:15 with coffee in the first

floor lounge of the School of Mathematics. The speakers

for the day include:

Chris Budd (Bristol)

Gene Golub (Stanford)

Alastair Spence (Bath)

Yves Tourigny (Bristol)

Andrew Stuart (Bath)

Andrew Cliffe (Harwell & Visiting Research Fellow, Bristol)

Andy Wathen (Bristol)

Andy Wathen

(+44 0272 303313)

------------

From: Ken Atkinson <atkinson@math.uiowa.edu>

Date: Wed, 7 Nov 90 16:28:29 CST

The Mathematics Department of the University of Iowa invites applications

for the following positions:

1. Three tenure-track appointments at the Assistant or beginning Associate

Professor level beginning in the 1991-92 academic year. One of these

is to be in numerical analysis and two are to be filled by specialists

in harmonic analysis, probability theory, or topology of manifolds.

Selection will be based on evidence of outstanding research

accomplishments or potential, and teaching ability. A Ph.D. or

equivalent training is required.

2. One senior faculty position beginning in 1991-92 academic year or later.

Only applicants of extraordinary stature will be considered. A strong

record of leadership in teaching and research in one of the department's

current or developing areas of strength is required.

3. Pending availability of funds, one or more visiting positions for all

or part of the 1991-92 academic year. Selection will be based on

research expertise and teaching ability.

of the current faculty.

Women and minority candidates are especially urged to apply for any of the

above positions. The University of Iowa welcomes the employment of highly

qualified professional couples on its faculty and staff, permits the

appointment of faculty couples within the same department, and permits the

sharing of a single appointment by a faculty couple.

Applications will be received until January 31, 1991, or until the positions

are filled. To apply send a complete vita and have three letters of

recommendation sent to:

Professor W.A. Kirk, Chair

Department of Mathematics

University of Iowa

Iowa City, Iowa 52242

The University of Iowa is an Equal Opportunity/Affirmative Action Employer.

------------

From: David E. Keyes <keyes@icase.edu>

Date: Thu, 8 Nov 90 08:50:18 EST

Eighty-two attendees with diverse interests in computer science and

scientific computing gathered at the University of Toronto on October 26

and 27, 1990 for the Eighth Parallel Circus. Thirty-two talks were

presented in two very full days spanning topics from languages to

hardware, from lattice dynamics to the dynamics of financial markets.

In the democratic tradition of the circus, a single podium was

alternated between graduate students giving their first public talks and

directors of multimillion dollar research centers. Several works in

progress appeared to receive some new direction in the brief group

discussions following each talk.

Since its inauguration at Yale in 1986, the Parallel Circus has been

repeated nearly semi-annually at mid-semester, fall and spring.

Initially a northeast U.S. meeting, the circus swung west to Stanford

in March, 1990, and has now gone international. The Eighth Circus was

graciously hosted by Izzy Nelken, Christina Christara, and Ken Jackson

of the Toronto CS Department, who arranged excellent on-campus

facilities (including guest logins), a Chinese banquet, and a

wine-and-cheese to prolong discussions into the conference evenings.

Gene Golub of Stanford served in his traditional role as program

moderator. Thanks to financial support from the Information Technology

Research Center (ITRC) and the University of Toronto, the circus was

free to speakers and listeners alike.

The University of Toronto contributed the largest delegation of 23

participants, followed by Syracuse University with seven, and the

University of Illinois with four. Apart from lone representatives from

Denmark and Norway, the participants were evenly divided between the

U.S. and Canada. The Friday-Saturday meeting is primarily a gathering

of academics, though five researchers from government laboratories and

six from private industry (including two from supercomputer vendors)

also participated.

As the availability of parallel hardware increases, so does the

proportion of talks reporting results from implementations. Half of the

talks at the Eighth Circus were backed by experience on various parallel

machines, the Intel hypercubes (iPSC/2 and 860) and the Connection

Machine-2 being most prevalent, with the Alliant, the Ncube, AMT DAP,

the Sequent, and the Transputer also featured.

Five of the talks fell under the linear algebra heading: up- and

downdates of Cholesky factorizations were considered by Chris Bischoff

(Argonne), multiple updates of orthogonal factorizations by Eleanor Chu

(U. of Waterloo), conjugate gradients and block-tridiagonal systems

on the CEDAR system by Ahmed Sameh (U. of Illinois), singular- and

eigenvalue decompositions by David Schimmel (Georgia Tech.), and

triangular systems on systolic arrays by Xiaoyuan Tu (McMaster).

Topics in ordinary differential equations included multirate s-stage

p-parallel q-processor methods presented by Ken Jackson (U. of Toronto),

partitioned systems of ODEs by Stig Skelboe (U. of Illinois), retarded

ODEs by Per Thomsen (Danmarks Teknishe Hojskole), and multiple shooting

by Stephen Wright (Argonne).

Partial differential equations received attention in eight talks.

Parallel multilevel methods were presented by Xian-Zhong Guo (U. of

Maryland), Michael Holst (U. of Illinois), and Ray Tuminaro

(Sandia-Albuquerque). Bernard Bialecki and Graeme Fairweather (both of

the University of Kentucky) discussed, respectively, ADI and direct

decomposition methods exploiting known eigendecompositions in the

solution of spline collocation systems. Another spline collocation

developer, Christina Christara (U. of Toronto) and finite difference

user David Keyes (on leave at ICASE from Yale) each presented

iterative domain decomposition methods, and Dennis Fox (U. of Western

Ontario) discussed parallelization analyses of various finite element

methods.

Optimization was the subject of talks by Virginia Torczon (Rice), who

has developed multi-directional search algorithms for unconstrained

nonlinear problems unsuited for quasi-Newton methods, and by Izzy Nelken

(U. of Toronto), who examined a parallelizable normal equation approach

for nonsquare linear systems.

Three representatives of the financial market modeling community

proclaimed the urgently felt need of their industry for parallel

processing, to produce on an hourly basis prognostications now being

done typically only weekly on supercomputers. Ron Dembo (U. of

Toronto) presented a parabolic system of PDEs currently used by over

100,000 financial instrument traders worldwide to estimate risk.

Stavros Zenios (Wharton) presented stochastic optimization work for

mortgage securities on the CM-2. Mustafa Pinar (Wharton) described an

adaptive penalty function method for regularizing multicommodity

modeling problems.

Rounding out the applications part of the program, lattice dynamics,

the N-body problem, and SIMD Monte Carlo were considered by Paul

Coddington (Syracuse), Chris Kuszman (Maspar), and Virendra Bhavsar

(U. of New Brunswick), respectively.

Bridging the gap between applications and environments, topics in

the theory of parallel computation were considered by Tao Yang (Rutgers),

who spoke on the clustering and granularity of directed acyclic task

graphs, and by Andrew Rau-Chaplin (Carleton), who proposed monotone

graphs -- more general than trees, less general than planar graphs --

as efficient parallel data structures for fine-grained hypercubes.

Five of the sessions concentrated on the ``how'' of parallel computing

rather than the ``what''. Bob Bernecky (Snake Island Research) and

Anne Elster (Cornell) led spirited advocacies of APL and C, respectively,

while Ed Segall (Rutgers) championed LINDA, and Bob van de Geijn (U. of

Texas-Austin) sought feedback on a draft version of the BLACS (Basic

Linear Algebra Communication Subroutines) primitives he is developing

during his leave at the University of Tennessee with Jack Dongarra. In

another free-wheeling discussion, emeritus professor of CS Kelly

Gotlieb and physicist George Luste of the hosting University of Toronto

solicited collective advice on parallel hardware acquisition.

Sequels to some of these talks and many others are expected at the Ninth

Parallel Circus, tentatively scheduled for March 22 and 23, 1991 at U.C.

Santa Barbara. (This immediately precedes the SIAM Conference on

Parallel Processing in Houston.) Host Omer Egecioglu of UCSB's CS

Department will announce the meeting over the NAnet as details become

available.

------------

From: Greg Astfalk <astfalk@convex.com>

Date: Thu, 8 Nov 90 11:03:36 -0500

Call for articles for SIAM News

SIAM News, the bi-monthly newsletter of SIAM, is running a regular

column entitled "Applications on Advance Architecture Computers." The

column will describe real-world applications that are solved on some

form of advanced architecture machine. The hardware is not limited to

just supercomputers but rather to any machine(s) that is more exotic than

the SISD class. The only criteria for an article is that the

application involve some mathematical formulation and its solution was

achieved on an 'advanced architecture' computer.

Real-world applications are preferable to an implementation of a

numerical algorithm. LU decomposition is a very important algorithm

but an application such as modeling of the human heart is preferred.

However, we are not excluding articles on algorithms alone.

The article(s) themselves should be 4-5 pages with perhaps one or two

figures. The article should be of a level that will appeal to the

broad backgrounds of the 9000 subscribers to SIAM News. As a rough

guide, something more technical than a Scientific American article but

not as technical as a SIAM Review article is appropriate.

If you have an application and would like to see it in the column we

would certainly like to accomodate you. Any articles and

communications can be addressed to me, the column editor,

Greg Astfalk Phone: 301-345-2400

Convex Computer Corp. FAX: 301-474-5795

7501 Greenway Center Dr. Email: astfalk@convex.com

Greenbelt, MD 20770-3514

------------

From: Eugenio Onate <rimne@etseccpb.upc.es>

Date: 9 Nov 90 13:15 +0100

PACTA`92

INTERNATIONAL CONFERENCE ON PARALLEL COMPUTING AND TRANSPUTER APPLICATIONS'92

Barcelona, 21-25 September 1992

Exhibition of Parallel Computing and Transputer Related Hardware

ORGANIZING INSTITUTIONS

- Universidad Politecnica de Cataluna. Dpt. d`Arquitectura de Computadors.

- Centro Internacional de Metodos Numericos en Ingenieria.

- Science and Engineering Research Council, U.K.

- Dpt. of Trade and Industry, U.K.

OBJECTIVES:

The conference aims to cater for "a state of the art" coverage of current

parallel computing theory and practice in different fields of science and

technology. Practical applications of transputers and other parallel

computing hardware like Shared Memory Vector Multiprocessor Computers,

Distributed Memory Multiprocessor Computers and Array Processor Computers

will feature prominently.

Papers will cover the following topics: CAD/CAM, Computational Mechanics

and Engineering, Continuous and Discrete Simulation, Educational Software,

Graphics, Hardware emulation, Image Processing, Industrial Inspection,

Instrumentation, Molecular and Particle Modelling, Music Synthesis,

Networking, Operating Systems, Programming Tools, Real Time Control, Signal

Processing.

COMPLAS III

THIRD INTERNATIONAL CONFERENCE ON COMPUTATIONAL PLASTICITY.

FUNDAMENTALS AND APPLICATIONS

Barcelona, 6-10 April 1992

ORGANIZERS

- E. Onate, Universitat Politecnica de Cataluna, Spain.

- D.R.J. Owen, University College of Swansea, U.K.

- E. Hinton, University College of Swansea, U.K.

OBJECTIVES

The first two conferences in this series were held in Barcelona in April, 1987

and September, 1989 and the present conference pursues the same objective of

bringing together leading researchers and practitioners in the field of

computational plasticity. This will provide a forum for discussion of the

current state of solution procedures for plasticity problems and their

integration in computer aided analysis and design.

The conference will address both the theoretical bases for the solution of

plasticity problems and the numerical algorithms necessary for efficient and

robust computer implementation. The ever increasing rate of development of new

engineering materials required to meet advanced technological needs poses

fresh challenges in the field of constitutive modelling. The complex behaviour

of such materials now demands a closer interaction between numerical analysis

and material scientists in order to produce thermodynamically consistent

models which provide a response in keeping with fundamental micromechanical

principes and experimental observartions.

For further information on either of these two meetings, please contact

Prof. Eugenio Onate

COMPLAS III Secretariat

Centro Internacional de Metodos Numericos en Ingenieria

Modulo C1, Campus Norte UPC

Gran Capitan, s/n. 08034 Barcelona, Spain.

Ph.: 34-3-401 6487 / 2057016

Fax: 34-3-401 6517

------------

From: Andreas Griewank <griewank@antares.mcs.anl.gov>

Date: Fri, 9 Nov 90 16:14:00 CST

SIAM WORKSHOP ON THE

AUTOMATIC DIFFERENTIATION OF ALGORITHMS

Theory, Implementation, and Applications

1991, January 6.-8.

Breckenridge, Colorado

Funding Agencies: Air Force Office of Scientific Research (AFOSR)

Army Research Office (ARO)

Organizers: Andreas Griewank, Argonne National Laboratory

George Corliss, Marquette University

Thirty half hour presentations will cover all aspects of automatic

differentiation, a chain rule based technique for obtaining numerical

values of first and higher derivatives. The approach can be applied

to any function that is defined as a composition of of arithmetic

operations and elementary functions, usually in form of a computer

program for its evaluation. Several speakers will present and

demonstrate software packages that accept evaluation programs in

FORTRAN and C as input and generate extended object code for the

simultaneous evaluation of various derivatives together with the

original scalar or vector function. Since the underlying chain rule

may be applied in several ways, one can distinguish between different

modes of automatic differentiation (in particular forward and reverse),

which differ radically in terms of their temporal and spatial

requirements. More than half of the talks focus on applications,

e.g.: optics, nuclear engineering, weather modeling, satellite

simulations, economical modeling, forest growth studies, and chemical

process simulation.

There is room for a limited number of additional attendees.

Students and junior faculty may apply for financial support.

For a tentative schedule and technical details please contact

A.Griewank (griewank@mcs.anl.gov), G.Corliss (georgec@boris.mscs.mu.edu)

or Trini Flores of the SIAM conference department (215-382-9800).

------------

From: SIAM Publications Department <SIAMPUBS@WILMA.WHARTON.UPENN.EDU>

Date: Wed, 7 Nov 90 11:02 EDT

Contents

SIAM Journal on Control and Optimization

Vol 29, No. 2, March 1991

Viablity Problems for Nonautonomous Differential Inclusions

Peter Tallos

Continuous-Time Stochastic Adaptive Control

M. Gevers, G. C. Goodwin, and V. Wertz

A Characterization of All Solutions to the Four Block General Distance Problem

K. Glover, D. J. N. Limebeer, J. C. Doyle, E. M. Kasenally, and M. G. Safonov

Duality Relationships for Entropy-Like Minimization Problems

J. M. Borwein and A. S. Lewis

1-Determinancy of Feasible Sets

Toshihiro Matsumoto, Susumu Shindoh, and Ryuichi Hirarayashi

Asymptotic Locations of Eigenfrequencies of Euler-Bernoulli Beam with

Nonhomogeneous

Structural and Viscous Damping Coefficients

Hankun Wang and Goong Chen

Exponential Decay of the Energy of a One-Dimensional Nonhomogeneous Medium

Jong Uhn Kim

On a Convex Parameter Space Method for Linear Control Design of Uncertain

Systems

J. C. Geromel, P. L. D. Peres, and J. Bernussou

On the Convergence of the Proximal Point Algorithm for Convex Minimization

Osman Guler

Realization of Acausal Weighting Patterns with Boundary-Value Descriptor

Systems

Ramine Nikoukhah, Bernard C. Levy, and Alan S. Wilsky

The Dynamic Programming Equation for the Time-Optimal Control Problem in

Infinite Dimensions

Viorel Barbu

Existence of Control Lyapunov Functions and Appplications to State Feedback

Stabilizability of

Nonlinear Systems

J. Tsinias

Second-Order Hamilton-Jacobi Equations in Infinite Dimensions

Piermarco Cannarsa and Guiseppe Da Prato

Calmness and Exact Penalization

J. V. Burke

Erratum: Controllability of Nonlinear Discrete-Time Systems: A Lie-Algebraic

Approach

Bronislaw Jakubczyk and Eduardo D. Sontag

------------

From: SIAM Publications Department <SIAMPUBS@WILMA.WHARTON.UPENN.EDU>

Date: Wed, 7 Nov 90 11:47 EDT

Contents

SIAM Journal on Mathematical Analysis

March, 1991 Volume 22, Number 2

An Existence Theorem for Model Equations Resulting from Kinetic Theories of

Polymer Solutions

Michael Renardy

The Effect of Temperature Dependent Viscosity on Shear Flow of

Incompressible Fluids

M. Bertsch, L. A. Peletier, and S. M. Verduyn Lunel

The Nonconvex Multi-Dimensional Riemann Problem for Hamilton-Jacobi

Equations

Martino Bardi and Stanley Osher

The Analysis of a Model for Wave Motion in a Liquid Semiconductor: Boundary

Interaction and Variable Conductivity

William V. Smith

Qualitative Theory of the Cauchy Problem for a One-Step Reaction Model on

Bounded Domains

Joel D. Avrin

Stability Analysis for the Slow Travelling Pulse of the Fitzhugh-Naguma

System

Gilberto Flores

On the Bifurcation of Radially Symmetric Steady-State Solutions Arising in

Population Genetics

K. J. Brown and A. Tertikas

On the Representation of Stokes Flows

Werner Kratz

Isolated Singularities of p-Harmonic Functions in the Plane

Juan J. Manfredi

Approximation of Solutions of Singular Second Order Boundary Value Problems

A. M. Fink, Juan A. Gatica, Gaston E. Hernandez, and Paul Waltman

Some Singular Nonlinear Boundary Value Problems

John V. Baxley

Inversion of Discontinuities for the Schrodinger Equation in Three Dimensions

Lassi Paivarinta and Errki Somersalo

Two-Dimensional Stationary Phase Approximation: Stationary Point at a Corner

J. P. McClure and R. Wong

On the Asymptotic Behavior of the Coefficients of Asymptotic Power Series

and its Relevance to Stokes Phenomena

G. K. Immink

Invertibility of Shifted Box Spline Interpolation Operators

C. K. Chui, J. Stockler, and J. D. Ward

A Simple Wilson Orthonomal Basis with Exponential Decay

Ingrid Daubechies, Stephane Jaffard, and Jean-Lin Journe

------------

From: SIAM Publications Department <SIAMPUBS@WILMA.WHARTON.UPENN.EDU>

Date: Wed, 7 Nov 90 11:47 EDT

Contents

SIAM Journal on Numerical Analysis

FEBRUARY 1991 Volume 28, Number 1

Convergence of a Particle Method for the Relativistic Vlasov-Maxwell System

Robert Glassey and Jack Schaeffer

Numerical Passage from Kinetic to Fluid Equations

F. Coron and B. Perthame

Adaptive finite element methods for parabolic problems

I: A linear model problem.

Kenneth Eriksson and Claes Johnson

A Finite-Difference Scheme for the Navier-Stokes Equations of

One-Dimensional, Isentropic, Compressible Flow

Roger Zarnowski and David Hoff

A Pseudospectral Finite-Element Method for Solving

Two-Dimensional Vorticity Equations

Guo Ben-Yu and Ma He-Ping

A Note on the Convergence of the Discontinuous Galerkin

Method for a Scalar Hyperbolic Equation

Todd E. Peterson

Solution of Steady-State, Two-Dimensional Conservation Laws

by Mathematical Programming

John E. Lavery

A Weighted Least Squares Method for the Backward-Forward Heat Equation

A. K. Aziz and J.-L. Liu

Physically Motivated Domain Decomposition for singularly Perturbed Equations

Jeffrey S. Scroggs

On the Schwarz Alternating Method with More than Two

Subdomains for Nonlinear Monotone Problems

Lori Badea

Approximation Methods for the Consistent Initialization of

Differential-Algebraic Equations

B. Leimkuhler, L. R. Petzold, and C. W. Gear

Bounds and Estimates for Condition Numbers of Integral Equations

Peter Linz

Accelerated Projection and Iterated Projection Methods with

Applications to Nonlinear Integral Equations

David R. Dellwo and Morton B. Friedman

On the Global Convergence of Trust Region Algorithms using

Inexact Gradient Information

Richard G. Carter

A Global Convergence Theory for the Celis-Dennis-Tapia Trust

Region Algorithm for Constrained Optimization

Mahmoud El-Alem

------------------------------

End of NA Digest

**************************

-------