- Today's Editor:
- Cleve Moler
- The MathWorks, Inc.
- moler@mathworks.com

- Solution to Ricatti Equation
- New Book, Numerical Methods for Image Registration
- Will Light Memorial Conference
- Conference in Melbourne on Computational Techniques and Applications
- Special issue of Theoretical Computer Science
- Faculty Position at at Iowa State University
- Faculty Positions at Virginia Tech
- Faculty Positions at San Jose State University
- Postdoctoral Position at Rensselaer Polytechnic Institute
- Postdoctoral Position at the University of Kentucky
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-------------------------------------------------------

From: Maher Moakher <Maher.Moakher@enit.rnu.tn>

Date: Thu, 27 Nov 2003 09:19:12 +0100

**Subject: Solution to Ricatti Equation**

This is a response to the question by Zhizhou Wang that was posted in

the NA Digest V. 03, #45.

The SPD solution to the Ricatti equation XAX = B is given by

the "geometric mean" of the matrices A and B. It is given

explicitely by any of the equivalent six expressions:

X = A(A^{-1} B)^{1/2}

= B(B^{-1} A)^{1/2}

= (B A^{-1})^{1/2} A

= (A B^{-1})^{1/2} B

= A^{1/2} (A^{-1/2} B A^{-1/2})^{1/2} A^{1/2}

= B^{1/2} (B^{-1/2} A B^{-1/2})^{1/2} B^{1/2}

When A and B commute, it reduces to (A B)^{1/2}.

Here are some references to the geometric mean of SPD matrices:

W. N. Anderson and G.E. Trapp, "Shorted operators", SIAM J. Appl. Math.,

28 (1975), pp. 60--71.

J. D. Lawson and Y.Lim, "The geometric mean, matrices, metrics and

more", Amer. Math. Monthly, 108 (2001), pp. 797--812.

M. Moakher, "A differential geometric approach to the geometric mean of

symetric positive-definite matrices", submitted to SIAM J. Matrix Anal.

Appl., 2003.

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

From: Daniel Stewart <daniel.stewart@oup.com>

Date: Tue, 25 Nov 2003 17:29:09 -0000

**Subject: New Book, Numerical Methods for Image Registration **

NEW FROM OXFORD

Numerical Methods for Image Registration

Jan Modersitzki, Institute of Mathematics, University of Lubeck

Based on the author's lecture notes and research, this well-illustrated and

comprehensive text is one of the first to provide an introduction to image

registration with particular emphasis on numerical methods in medical

imaging.

For more information: www.oup.co.uk/isbn/0-19-852841-8

<http://www.oup.co.uk/isbn/0-19-852841-8>

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

From: Jeremy Levesley <jl1@mcs.le.ac.uk>

Date: Tue, 25 Nov 2003 13:02:24 +0000 (GMT)

**Subject: Will Light Memorial Conference**

The Will Light Memorial Conference

Professor Will Light, of the University of Leicester, died on December 8th 2002.

The Will Light Memorial Conference, on December 18th and 19th 2003, brings

together a number of Will's collaborators and friends, in a conference to

celebrate Will's life and work.

On December 18th, Jeremy Levesley, friend and colleague of Will's at Leicester,

will talk about Will's contribution to approximation theory. December 19th sees

the main part of the conference. The following speakers will talk on topics that

Rick Beatson, Canterbury, New Zealand.

Rob Brownlee, Leicester, England

Manfred Von Golitschek, Wuerzburg, Germany.

Tim Goodman, Dundee, Scotland

George Phillips, St Andrews, Scotland

Robert Schaback, Goettingen, Germany.

For more information, see

http://www.mcs.le.ac.uk/~jlevesley/willconf/willconf.htm

-- Jeremy

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

From: Chaoqun Liu <cliu@omega.uta.edu>

Date: Wed, 26 Nov 2003 17:36:28 -0600 (CST)

**Subject: Conference in Melbourne on Computational Techniques and Applications**

FIRST ANNOUNCEMENT AND CALL FOR PAPERS - CTAC 2004

CTAC 2004

The 12th Biennial

Computational Techniques and Applications

Conference and Workshops

September 27 - October 1, 2004

The University of Melbourne

Melbourne, Victoria, Australia

http://www.conferences.unimelb.edu.au/CTAC2004/

Contributed papers are currently being sought in the areas of

computational mathematics; development and application of numerical

algorithms; numerical modelling of scientific, technical and

industrial applications; high performance computing; and other

aspects of the computational sciences for presentation at the

conference.

The conference program will include keynote addresses from the

following Invited Speakers:

Prof. Gary Leal, University of California at Santa Barbara

(Computational Studies in Materials Research)

Prof. Mark Cross, University of Greenwich

(Perspective on the current status of CFD)

Prof. Kevin Burrage, The University of Queensland

(Models for Genetic Regulation and their Simulation)

Dr Robert Anderssen, CSIRO

(Inverse Problems)

Prof. Chaoqun Liu, University of Texas at Arlington

(High Performance Computation for DNS/LES)

Immediately following the three days (27-29 September) of invited and

contributed presentations there will be two days of workshops

(September 30 - October 1). The topics for the CTAC 2004 workshops

and contact information for their respective conveners are:

Complex Fluids - Malcolm Davidson <m.davidson@unimelb.edu.au>

Dispersed multiphase flows - Jiyuan Tu <jiyuan.tu@rmit.edu.au>

High performance computing - Bill Appelbe <bill@cs.rmit.edu.au>

Molecular simulation - Steve Carnie <stevenlc@unimelb.edu.au>

Further information, including registration information, the

registration form, and information on submitting abstracts, etc. is

available from the conference website:

http://www.conferences.unimelb.edu.au/CTAC2004/

This site is continually updated as further information on CTAC 2004

becomes available.

If you have any questions regarding CTAC 2004, please contact:

Conference Management

Old Physcis Building

The University of Melbourne

Victoria, Australia

Phone: +61 3 8344 6389

Fax: +61 3 8344 6122

Email: ctac-2004@unimelb.edu.au

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

From: Nathalie Revol <Nathalie.Revol@ens-lyon.fr>

Date: Fri, 28 Nov 2003 15:56:21 +0100 (CET)

**Subject: Special issue of Theoretical Computer Science**

THEORETICAL COMPUTER SCIENCE

Special issue: Real Numbers and Computers

Guest editors: Marc Daumas and Nathalie Revol.

IMPORTANT DATES (tentative planning):

- Deadline for submissions of manuscripts: January 5th, 2004

(full papers only; extended abstracts will be rejected)

- Notification of acceptance/rejection: April, 2004

- Deadline for reception of final papers: July, 2004

- Parution: beginning of 2005

Efficient manipulation of real numbers in computers is still a

challenge. Many interesting theoretical and algorithmic problems are

linked with that topic and belong to quite distant fields such as

computer science, number theory, numerical analysis, computer algebra

and logics. A number of TCS special issues on real numbers and

computers has previously appeared (162 (1), 210(1), 279 (1-2) and 291

(2)), as follow-up to the RNC meetings on these topics. The last

meeting was RNC5 which took place in Lyon in September 2004, cf:

http://www.ens-lyon.fr/LIP/Arenaire/RNC5/

TOPICS

Scientists working on questions related to real computer arithmetic

are encouraged to present the theoretical or algorithmic aspects of

their results, even if they did not attend the RNC5 conference. Survey

and tutorial articles may be suitable if clearly identified as

such. Topics include (but are not restricted to) the following list:

- any computational number system

- implemented by a software package or in hardware,

- floating and fixed point,

- serial, on line arithmetic,

- continued fractions,

- exact computations,

- multiple precision,

- interval and stochastic arithmetics.

Please find additional information at

http://www.ens-lyon.fr/LIP/Arenaire/RNC5/TCS

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

From: Hailiang Liu <hliu@iastate.edu>

Date: Wed, 26 Nov 2003 13:01:53 -0600

**Subject: Faculty Position at at Iowa State University**

The Department of Mathematics at Iowa State University has tenure track

positions open in the area of Numerical analysis and scientific computing.

These positions can be filled at the assistant professor or associate

professor level, depending on the experience of the candidates, please see

http://www.math.iastate.edu/dept/jobposition.html

for details of the positions and how to apply. To guarantee consideration,

application must be received by January 15, 2004.

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

From: Jeff Borggaard <jborggaard@vt.edu>

Date: Sun, 23 Nov 2003 12:25:12 -0500

**Subject: Faculty Positions at Virginia Tech**

Faculty Positions in Computational Sciences at Virginia Tech:

Virginia Tech has embarked upon a major interdisciplinary initiative in the

computational sciences with the development of a state-of-the-art terascale

computing facility that is ranked among the top supercomputers in the world.

As the next step, the University is now seeking to hire approximately 12

tenure-track faculty in the Colleges of Science and Engineering. As part of

this initiative, the Virginia Tech Department of Mathematics invites

applications for positions in the broadly defined area of computational

science at either the junior or senior levels. Successful candidates must

show evidence of participation in multidisciplinary research efforts, will

be expected to establish an internationally recognized, and externally

funded research program and to participate in teaching at both the graduate

and undergraduate levels.

Applicants should submit a curriculum vitae and candidate statement detailing

a brief description of research plans online at jobs.vt.edu.

Arrange for four letters of support to be sent to: Jeff Borggaard, Chair,

Computational Sciences Search Committee, Department of Mathematics, Virginia

Tech, Blacksburg, VA 24061. Applicants at the senior level should also

mail five selected publications, a record of funding and a description

of their previous multidisciplinary research projects to this address.

Applications will be considered beginning December 15, 2003. Virginia Tech

is an AA/EEO employer; applications from members of underrepresented groups

are especially encouraged.

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

From: Leslie Foster <foster@math.sjsu.edu>

Date: Mon, 24 Nov 2003 17:03:51 -0800

**Subject: Faculty Positions at San Jose State University**

Two tenure-track positions

Rank Assistant/Associate Professor

Candidates must have a Ph.D. in Mathematics, Applied Mathematics or

Statistics by August 2004. All areas accepted; statistics and applied

mathematics, including numerical analysis, especially welcome. Position

involves teaching undergraduate and graduate courses, advising Master's

theses, maintaining scholarly activity, and performing committee work.

Successful candidates must be prepared to teach a population of great

diversity in age, cultural background, ethnicity, primary language and

academic preparation. Salary commensurate with qualifications and

experience.

Send cover letter, CV, graduate transcript, teaching statement,

research statement, and three references by January 15, 2004 to:

Recruitment Committee

Department of Mathematics

San Jose State University

One Washington Square

San Jose, CA 95192-0103

See http://www.math.sjsu.edu for more information.

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

From: Darlinda Dabor <DDabor@ny.hodes.com>

Date: Mon, 24 Nov 2003 13:28:49 -0500

**Subject: Postdoctoral Position at Rensselaer Polytechnic Institute**

POSTDOCTORAL POSITION

Department of Mathematical Sciences

Rensselaer Polytechnic Institute is pleased to announce the availability of

a postdoctoral position in applied mathematics and/or mechanical engineering

with emphasis on the theoretical results and/or algorithm development for

elastography problems. This position is anticipated to begin as soon as

possible but could start as late as February 2004. The position is for one

year, renewable for an additional year. Travel support to attend conferences

will be provided.

Applicants should send a letter of application, a curriculum vita, a

description of research interests, and three letters of recommendation sent

directly to: Alice Baker, Department of Mathematical Sciences, Rensselaer

Polytechnic Institute, 110 8th Street, Troy, NY 12180. Inquiries should be

sent to Professor Joyce McLaughlin (mclanj@rpi.edu) or Professor Antoinette

Maniatty (maniaa@rpi.edu)

Review of applications will begin one month after the posting of this

announcement and will continue until the position is filled.

Rensselaer is an Equal Opportunity/Affirmative Action Employer. Women and

Minorities are strongly encouraged to apply.

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

From: Craig Douglas <douglas@ccs.uky.edu>

Date: Wed, 26 Nov 2003 11:16:34 -0500

**Subject: Postdoctoral Position at the University of Kentucky**

The Center for Computational Sciences and Computer Science Department at

the University of Kentucky has one or more openings for Post-doctoral

Research Associates, funded by an NSF grant on dynamic data driven simulation

for wildfire modeling. This is a joint project with the National Center on

Atmospheric Research, University of Colorado at Denver, Texas A&M University,

and Rochester Institute of Technology. The associate will work with Professor

Craig Douglas and his group.

The appointments are possible for one or two years. An associate should

have a solid background and a research record in one or more of the

following areas:

- Physical modeling by partial differential equations

- Discretization techniques

- Physical or mathemtical model changing due to data injection

- Grid or parallel computing with results rendered on a wide variety of devices

- Analysis of ensemble computing

The associate should have a demonstrated ability to create parallel programs

on small SMPs, and will be expected to direct the programming work of one or

more graduate students. Ability to work with legacy numerical codes in Fortran

is required.

To apply, please send your CV including publications and experience in

software development, and have three letters of recommendation sent to

Craig Douglas <craig.douglas@uky.edu>.

Review of applications begins immediately and will continue until the

positions are filled.

The University of Kentucky is an equal opportunity/affirmative action

employer, and especially encourages applications from women and minorities.

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

End of NA Digest

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