Send mail to: mgnet@cs.yale.edu for the digests mgnet-requests@cs.yale.edu for comments or help To be removed from the mailing list, just reply to a message and add REMOVE to the Subject field. My real e-mail address is in the From field. Anonymous ftp repository: www.mgnet.org (128.163.209.19) WWW Sites: http://www.mgnet.org or http://casper.cs.yale.edu/mgnet/www/mgnet.html or http://www.cerfacs.fr/~douglas/mgnet.html or http://phase.hpcc.jp/mirrors/mgnet or http://www.tat.physik.uni-tuebingen.de/~mgnet Editor: Craig Douglas (douglas-craig@cs.yale.edu) Associate editor: Gundolf Haase (gundolf.haase@uni-graz.at) Volume 15, Number 10 (approximately October 31, 2005) Volume 15, Number 11 (approximately November 30, 2005) Today's topics: Number 12 Important Dates Submitting a Preprint to MGNet (Oh et al) santafe Code Trilinos Release 6.0 Is there a bug in Fishpack? Ninth Copper Mountain Conference on Iterative Methods BAIL 06 (Int. Conference on Boundary and Interior Layers) A.A. Markov Anniversary Meeting This is a great place to let the world know about your results. It is highly rated for letting the world know about recent graduates' dissertations and young reserachers' papers... and it is free and open source. ------------------------------------------------------- Date: Wed, 30 Nov 2005 10:23:24 -0400 From: Craig Douglas Subject: Number 12 There will be a volume 15, number 12 late this month. It will have something of interest to algebraic multigrid (AMG) users at a minimum. This would be a good time to contribute something to MGNet. I keep getting asked if multigrid is still a going research area. I say, of course. More announcements, pointers to results or papers or codes, etc. will help keep the field lively. ------------------------------------------------------- Date: Wed, 30 Nov 2005 10:22:21 -0400 From: Craig Douglas Subject: Important Dates E-gads... There are a lot coming up. Jan. 10 Copper Mountain student competition full papers (<= 10 pages) Feb. 1 Copper Mountain author abstracts Mar. 1 Copper Mountain early registration and hotel reservations See http://amath.colorado.edu/faculty/copper E-mail: Copper.conference@colorado.edu Dec. 31 2006 SIAM George Polya Prize Dec. 31 2006 SIAM W. T. and Idalia Reid Prize Dec. 31 2006 SIAM SIAG/APDE Prize - deadline Dec. 31 ? 2006 SIAG/LA Prize ? 2006 SIAM Student Paper Prize See http://www.siam.org/prizes/nominations.php Please address inquiries to: J. M. Littleton SIAM E-mail: littleton@siam.org Telephone: +1-215-382-9800 ext. 303 Fax: +1-215-386-7999 Jan. 10 2006 SIAM Meeting Minisymposium proposals Jan. 24 2006 SIAM Meeting Abstracts for all contributed and minisymposium presentations See http://www.siam.org/meetings/an06/index.php E-mail: meetings@siam.org Jan. 9 A.A. Markov Anniversary Meeting Submissions See http://www.csc2.ncsu.edu/conferences/nsmc/ E-mail: billy@csc.ncsu.edu and langvillea@cofc.edu Dec. 16 BAIL 06 Abstracts and Minisymposia See http://www.math.uni-goettingen.de/bail/ ------------------------------------------------------- Date: Tue, 22 Nov 2005 20:22:20 -0800 From: "Seungseok Oh" Subject: Submitting a Preprint to MGNet (Oh et al) Multigrid Tomographic Inversion with Variable Resolution Data and Image Spaces Seungseok Oh (1), Charles A. Bouman (2), and Kevin J. Webb (2) Abstract A multigrid inversion approach that uses variable resolutions of both data space and image space is proposed. Since computational complexity of inverse problems typically increases with a larger number of unknown image pixels and a larger number of measurements, the proposed algorithm further reduces the computation relative to conventional multigrid approaches, which change only the image space resolution at coarse scales. The advantage is particularly important for data-rich applications, where data resolutions may differ for different scales. Applications of the approach to Bayesian reconstruction algorithms in transmission and emission tomography with a generalized Gaussian Markov random field image prior are presented, both with a Poisson noise model and with a quadratic data term. Simulation results indicate that the proposed multigrid approach results in significant improvement in convergence speed compared to the fixed-grid iterative coordinate descent (ICD) method and a multigrid method with fixed data resolution. Index Terms Multigrid algorithms, multiresolution, inverse problems, image reconstruction, computed tomography, emission tomography, transmission tomography (1) Fujifilm Software (California), Inc., San Jose, CA, USA, soh@fujifilmsoft.com (2) School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA, {bouman,webb}@ecn.purdue.edu Editor's Note: in http://www.mgnet.org/mgnet/papers/Oh-Bouman-Webb/tip06.pdf ------------- ------------------------------------------------------- Date: Mon, 24 Oct 2005 09:23:39 +0200 From: Alfio Borzi Subject: santafe Code With your help, I would like to distribute a code for open-loop optimal control of time-dependent reaction-diffusion systems. The code is designed to solve for tracking and terminal observation problems also in combination with receding horizon techniques. The code is written in FORTRAN (santafe.for; santafe.dat is the input file), is public domain (therefore no guarantee) and a detailed description will appear in the proceedings of the Second Sandia Workshop on PDE-Constrained Optimization: Toward Real-time and Online PDE-constrained Optimization May 19-21, 2004 Bishop's Lodge, Santa Fe, New Mexico Workshop organizing committee: Larry Biegler, Omar Ghattas, Matthias Heinkenschloss, David Keyes, Bart van Bloemen Waanders. For details see: http://www.cs.cmu.edu/~oghattas/pdeopt04. Grazie mille e Salutissimi Alfio Editor's Note: see http://www.mgnet.org/mgnet-codes-borzi.html ------------- ------------------------------------------------------- Date: Wed, 14 Sep 2005 22:58:39 -0500 From: "Michael A Heroux" Subject: Trilinos Release 6.0 Release 6.0 of Trilinos is available for download at the Trilinos website. This version has one new package, and major enhancements to most other packages. Below is a brief set of release notes. More details can be found at the Trilinos website. Please contact trilinos-help@software.sandia.gov if you have any problems. Links: Main Trilinos website: http://software.sandia.gov/trilinos Download link: http://software.sandia.gov/trilinos/downloads.html Release 6.0 Notes: http://software.sandia.gov/trilinos/release_6.0_notes.html Tutorial: http://software.sandia.gov/trilinos/TrilinosTutorial.pdf Brief release notes: Overview: Trilinos is a collection of compatible software packages that support parallel linear algebra computations, solution of linear, non-linear and eigen systems of equations and related capabilities. The majority of packages are written in C++ using object-oriented techniques. All packages are self-contained, with the Trilinos top layer providing a common look-and-feel and infrastructure. Packages: The version 6.0 general release contains 18 packages: Amesos, Anasazi, AztecOO, Didasko, Epetra, EpetraExt, Ifpack, Kokkos, Komplex, LOCA, ML, New_Package, NOX, Pliris, PyTrilinos, Teuchos, Thyra, and Triutils. The limited release contains an additional 9 packages that are available in special situations by request. These are: Belos, Capo, Claps, Jpetra, Meros, Rythmos, Tpetra, TSF, and TSFExtended. In addition to many new features across most packages, Trilinos Release 6.0 contains one new package, Thyra. This package represents our first general release of an abstract interface to support generic programming. Thyra contains interfaces for basic linear algebra objects, a first linear solver interface, and supporting software. Furthermore, adapters for Amesos, AztecOO, Epetra, Ifpack, ML, NOX and Teuchos provide a broad set of functionality to users of Thyra. A second major feature is the much improved design and implementation of PyTrilinos. PyTrilinos capabilities are now primarily distributed across Trilinos packages (although critical common functionality is still in the PyTrilinos package), so that Epetra, EpetraExt, Triutils, AztecOO, Amesos, Ifpack, ML, LOCA, NOX and New_Package are accessible to Python applications. PyTrilinos also supports parallel MPI execution without additional Python modules. Michael Heroux Sandia National Laboratories (320) 845-7695 maherou@sandia.gov ------------------------------------------------------- Date: Thu, 8 Dec 2005 17:13:43 +0530 From: "abhip" Subject: Is there a bug in Fishpack? I am a new user of Fishpack, which I primarily intend to use to solve Poisson's equations in cylindrical coordinates. One surprising result I found is that while using the routine "sepx4" if I took the no of grid points greater than a particular value (say 2000,2000) (consequently making the coordinate spacings smaller) the solution starts to diverge while it should have converged more. Is this a bug or a limitation in the code or am I wrong? For small no of grid points the solutions are exact and the speed is awsome. Also does anybody know of a double precision version of sepx4. I would appreciate any help from anybody. Thank you Dr Abhijit Poddar. Visiting Research Associate Satyen Bose national Centre for Basic Sciences ------------------------------------------------------- Date: Mon, 21 Nov 2005 08:16:03 -0700 From: Cathy Lee FRSC Subject: Ninth Copper Mountain Conference on Iterative Methods ANNOUNCING: Ninth Copper Mountain Conference on Iterative Methods April 2 - April 7, 2006 Copper Mountain, Colorado, USA ORGANIZED BY: The Center for Applied Scientific Computing, Lawrence Livermore Nat'l Lab University of Maryland Front Range Scientific Computations, Inc. The University of Colorado In Cooperation With: The Society for Industrial and Applied Mathematics TENATIVE SPONSORS: DOE, NSF, IBM, LANL, LLNL, Sandia THEMES: Model Order Reduction Multiscale and Imaging Problems Nonlinear Solvers Eigenvalue Methods Every effort will be made to encourage contributions from anyone whose interest lies in these important and rapidly evolving fields. IMPORTANT FEATURE: STUDENT PAPER COMPETITION. Travel and lodging assistance will be awarded to students and new PhDs judged to have submitted the best research papers. CONFERENCE DEADLINES: Student Papers Jan. 10, 2006 Author Abstracts Feb. 1, 2006 Early Registration March 2, 2006 Guaranteed Lodging March 2, 2006 FURTHER INFORMATION: Please access our web site at http://amath.colorado.edu/faculty/copper or contact Cathy Lee FRSC 1390 Claremont Drive Boulder, CO 80305 USA 303.554.1232 Copper.conference@colorado.edu ------------------------------------------------------- Date: Fri, 2 Dec 2005 11:08:43 +0100 (CET) From: Gerd Rapin Subject: BAIL 06 (Int. Conference on Boundary and Interior Layers) International Conference on "Boundary and Interior Layers" (BAIL 2006) Goettingen (Germany) July 24th to July 28th, 2006 Deadline for Abstracts: December 16th, 2005 Deadline for Minisymposia: December 16th, 2005 Deadline for Early Registration: May 16th, 2006 Invited Speakers: * P. Houston, University of Nottingham, Discontinuous Galerkin Finite Element Methods for CFD: A Posteriori Error Estimation and Adaptivity * P. Huerre, Ecole Polytechnique, Paris, Dynamics of hot jets: a numerical and theoretical study * M. Stynes, University College, Cork, Convection-diffusion problems, SDFEM/SUPG and a priori meshes * W. Wall, Technical University of Munich, Variational Multiscale Methods for incompressible flows Topics: * All aspects of computational and analytical methods for boundary and interior layers, and singular perturbation problems are welcome. Special emphasis is laid on the mathematical foundation of such methods. * Topics in fluid mechanics involving boundary and interior layers are welcome, including flow modelling (stability, laminar-turbulent transition, turbulence, ...), interactive boundary layers, simulation of boundary layer in Navier-Stokes solvers, boundary layer perturbation (vortices, wall perturbations, ...), boundary layer receptivity and control. * More generally, topics in any field in which boundary layers and interior layers occur are welcome. In particular, multi-scale problems are in the scope of the meeting. Web-site: http://www.math.uni-goettingen.de/bail/ ------------------------------------------------------- Date: Mon, 31 Oct 2005 20:01:10 -0500 From: William Stewart Subject: A.A. Markov Anniversary Meeting A.A. Markov Anniversary Meeting: Call for Papers. http://www.csc2.ncsu.edu/conferences/nsmc/ An international conference in honor of the 150th anniversary of the birth of A.A. Markov and the 100th anniversary of his work on chains will be held June 12--14, 2006 at the College of Charleston, SC, USA. In addition to regular sessons on research advances in the field, special sessions will be devoted to a historical perspective of Markov and his contemporaries and to the many important applications of Markov chains in today's fast-paced world. Authors are invited to submit research contributions on any aspect of the specification, solution, and analysis of Markov chains. Submitted papers should not exceed 20 single-spaced pages, including title, abstract, figures, tables and references. Papers should be submitted as a PDF file to both billy@csc.ncsu.edu and langvillea@cofc.edu Important dates: Submission deadline: January 9, 2006 Acceptance notification: March 6, 2006. Camera ready version: April 3, 2006. Organizers/Steering Committee: Ilse Ipsen, NC State University. Amy N. Langville, College of Charleston. Carl D. Meyer, NC State University. Harry G. Perros, NC State University. William J. Stewart, NC State University. Kishor S. Trivedi, Duke University. More complete information may be found at the conference webpage http://www.csc2.ncsu.edu/conferences/nsmc/ Dr. William J. Stewart Professor of Computer Science Box 8206 Tel: (919) 515-7824 North Carolina State University Fax: (919) 515-7896 Raleigh, NC 27695-8206, USA Email: billy@csc.ncsu.edu http://www.csc.ncsu.edu/faculty/WStewart/ ------------------------------ End of MGNet Digest **************************