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Date: Wednesday, 20-Nov-96 18:56:14 GMT
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<html><head><title> Stephen Vavasis </title></head><body><h1> Stephen A. Vavasis </h1>Associate Professor <br>Department of Computer Science <br>722 Rhodes Hall <br>Cornell University <br>Ithaca, NY 14853<br><p>email: vavasis@cs.cornell.edu <br>phone: 607-255-9213 <br>fax: 607-255-4428<br><p>During the period 6/12/96 to 6/30/97, I am onsabbatical at: <br><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><a href="http://www.mcs.anl.gov">MCS Division</a>, Bldg 221 <br><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><a href="http://www.anl.gov">Argonne National Laboratory</a> <br>9700 S. Cass Ave. <br>Argonne, IL 60439 <br>email: vavasis@mcs.anl.gov <br>phone: 630-252-6735 <br>fax: 630-252-5986 <br>Note change in area code effective 8/3/96.<br><p>My research interest is numerical analysis.  (You aren'tsure what numerical analysis is?  Please see the <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.cornell.edu/Info/People/lnt/defn.ps">essay</a>by my colleague L. N. Trefethen.)More specifically,I am interested in:<ul><li>Numerical optimization and complexity issues<li>Numerical methods for boundary value problems<li>Geometric problems arising in scientific computing<li>Sparse matrix computations</ul>I have a few recent manuscripts available on-line:<ul><li>S. Vavasis and Y. Ye, ``A primal dual accelerated interiorpoint method whose running time depends only on <em>A</em>''(<!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><a href="ftp://ftp.cs.cornell.edu/pub/vavasis/papers/accel-pd.ps.Z">click here</a>)<li><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><a href="http://cam.cornell.edu/ph/index.html">P. Hough</a> and  S. Vavasis, ``Complete orthogonal decompositionfor weighted least squares''(<!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><a href="ftp://ftp.cs.cornell.edu/pub/vavasis/papers/cod2a.ps.gz">click here</a>)<li>S. Mitchell and S. Vavasis, ``An aspect ratio bound for triangulating a d-gridcut by a hyperplane''(<!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><a href="ftp://ftp.cs.cornell.edu/pub/vavasis/papers/asp9.ps.Z">click here</a>)<li><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><a href="http://cam.cornell.edu/driscoll/index.html">T. Driscoll</a> and S. Vavasis,``Numerical conformal mapping using cross-ratios and Delaunay triangulation''(<!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><a href="ftp://ftp.cs.cornell.edu/pub/vavasis/papers/crdt.ps.gz">click here</a>)</ul><h3>The QMG package</h3>I have recently completed a software project on mesh generation forthe finite element method in three dimensions.  The software package,called QMG, is available at the source code level by anonymous ftp.With QMG you can construct polyhedral geometric objects with verycomplicated topology (holes, internal boundaries, etc.) andautomatically create an unstructuredtetrahedral mesh for them.  (The mesh generator is based on algorithmic work by Scott Mitchell and me.)You can also solve an elliptic boundaryvalue problem (div (c*grad u)=0) on your domain.  The package iswritten in C++ and Matlab and is distributedfor free at the source-code level (anonymous ftp distributionbegan 5/5/95). <p>QMG 1.1 was released on 20 November 1996.  QMG1.1 features manyimprovements over QMG1.0, including a faster mesh generation algorithm,VRML graphics, much cleaner C++ code, a boundary mesh generation algorithm,compatibility with Microsoft Windows NT as well as Unix, and compatibilitywith Tcl/Tk as well as Matlab.<p>Pleasesee the <!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><a href="http://www.cs.cornell.edu/Info/People/vavasis/qmg-home.html">on-line documentation</a>.<h3><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><a href="http://www.cs.cornell.edu/Info/Department/Annual95/Faculty/Vavasis.html">Vavasis's page from the 1995 annual report</a></h3><h3><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><a href="http://www.cs.cornell.edu/">Back to CS home page</a></h3>
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