A Parallel Monte Carlo Search Algorithm for the Conformational Analysis of Proteins (2008)
Daniel R. Rip, Stephen J. Thomas
In recent years several approaches have been proposed to overcome the multiple minima problem associated with non-linear optimization techniques used in the analysis of molecular conformations. One...
Atmospheric Dynamical Core, John Dennis, Aimé Fournier, William F. Spotz, Amik St-cyr, Mark A. Taylor, ...
We first demonstrate the parallel performance of the dynamical core of a spectral element atmospheric model. The model uses continuous Galerkin spectral elements to discretize the surface of the...
John Dennis, Aimé Fournier, William F. Spotz, Mark A. Taylor, Stephen J. Thomas, ...
We first demonstrate the parallel performance of the dynamical core of a spectral element atmospheric model. The model uses continuous Galerkin spectral elements to discretize the surface of the...
A Schwarz preconditioner for the cubed-sphere (2008)
Stephen J. Thomas, John M. Dennis, Henry M. Tufo, Paul F. Fischer
Abstract. A spectral element formulation of the atmospheric two-dimensional shallow water equations on the cubed-sphere is described. The equations are written in tensor form using the contravariant...
PROFESSIONAL EXPERIENCE: (2008)
Stephen J. Thomas, Visiting Professor, Mcgill Math
PUBLICATIONS: Section 1: Dissertations M. Eng. Thesis: A unified approach to linear filtering using a generalized covariance representation, 1986, McGill University, 103 pp. (stable and fast Kalman...
A Comparison of Two Shallow Water Models with Non-Conforming Adaptive Grids: classical tests (2007)
St-Cyr, Amik, Jablonowski, Christiane, Dennis, John M., Tufo, Henry M., Thomas, Stephen J.
In an effort to study the applicability of adaptive mesh refinement (AMR) techniques to atmospheric models an interpolation-based spectral element shallow water model on a cubed-sphere grid is...
Multiplicative, Additive and Restricted Additive Optimized Schwarz Preconditioning (2007)
St-Cyr, Amik, Gander, Martin J., Thomas, Stephen J.
We demonstrate that a small modification of the multiplicative, additive and restricted additive Schwarz preconditioner at the algebraic level, motivated by optimized Schwarz methods defined at the...
Amik St-cyr, Stephen J. Thomas
The purpose of this paper is to explore an alternative to the traditional interpolation based semi-Lagrangian time integrators employed in atmospheric models. A novel aspect of the present study is...
Terascale spectral element dynamical core for atmospheric general circulation models (2001)
Richard D. Loft, Stephen J. Thomas, John M. Dennis
Climate modeling is a grand challenge problem where scientific progress is measured not in terms of the largest problem that can be solved but by the highest achievable integration rate. These models...
History of U.S. Military Contributions to the Study of Viral Hemorrhagic Fevers (1998)
Thomas, Stephen J., Lawler, James V., Endy, Timothy P.
The viral hemorrhagic fever viruses represent a unique group of viruses that can produce large outbreaks of both animal and human disease and produce severe, highly fatal, human illnesses. The viral...
The Cost-Effectiveness of Semi-Lagrangian Advection (1996)
Peter Bartello, Stephen J. Thomas, J. Thomas
Abstract The purpose of this paper is to ascertain the cost-effectiveness of semi-Lagrangian advection schemes for a wide variety of geophysical flows at all scales. Our approach is first, to...