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Search Publications by: William L. George (Fed)

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Displaying 26 - 38 of 38

Accelerating Scientific Discovery through Computation and Visualization II

May 1, 2002
Author(s)
James S. Sims, William L. George, Steven G. Satterfield, Howard Hung, John G. Hagedorn, Peter M. Ketcham, Terence J. Griffin
This is the second in a series of articles describing a wide variety of projects at NIST that synergistically combine physical science and information science. It describes, through examples, how the Scientific Applications and Visualization Group (SAVG)

The Visible Cement Data Set

March 1, 2002
Author(s)
Dale P. Bentz, S Mizell, Steven G. Satterfield, J E. Devaney, William L. George, Peter M. Ketcham, James R. Graham, J E. Porterfield, Daniel A. Quenard, F A. Vallee, H Sallee, E Boller, J Baruchel
With advances in X-ray microtomography, it is now possible to obtain three-dimensional representations of a material's microstructure with a voxel size of less then one micrometer. The Visible Cement Data Set represents a collection of 3-D data sets

A Parallel 3D Dendritic Growth Simulator using the Phase-Field Method

January 1, 2002
Author(s)
William L. George, James A. Warren
We describe an implementation of a parallel finite-difference algorithm for the simulation of alloy solidification in three dimensions using the phase-field model. We also describe the visualization of the output from this simulator. Although thistype of

Volume Visualization of Bose-Einstein Condensates

April 1, 2001
Author(s)
Peter M. Ketcham, D L. Feder, Charles W. Clark, Steven G. Satterfield, Terence J. Griffin, William L. George, Barry I. Schneider, W P. Reinhardt
Theoretical aspects of Bose-Einstein condensates are investigated by conducting computer simulations of their behavior. Scientific visualization techniques are employed in order to examine the large amount of data generated by simulation. Visualization of

The Interoperable Message Passing Interface (IMPI) Extensions to LAM/MPI

March 1, 2001
Author(s)
J M. Squyers, A Lumsdaine, William L. George, John G. Hagedorn, J E. Devaney
Interoperable Message Passing Interface (IMPI) is a protocol specification to allow multiple MPI implementations to cooperate on a single MPI job. Unlike portable MPI implementations, an IMPI-connected parallel job allows the use of vendor-tuned message

Accelerating Scientific Discovery through Computation and Visualization

November 1, 2000
Author(s)
James S. Sims, John G. Hagedorn, Peter M. Ketcham, Steven G. Satterfield, Terence J. Griffin, William L. George, H A. Fowler, B A. am Ende, Howard Hung, Robert B. Bohn, John E. Koontz, Nicos Martys, Charles E. Bouldin, James A. Warren, D L. Feder, Charles W. Clark, Bernard J. Filla, Judith E. Terrill
The rate of scientific discovery can be accelerated through computation and visualization. This acceleration results from the synergy of expertise, computing tools, and hardware for enabling high performance computation, information science, and

IMPI: Making MPI Interoperable

May 1, 2000
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
The Message Passing Interface (MPI) is the de facto standard for writing parallel scientific applications in the message passing programming paradigm. Implementations of MPI were not designed to interoperate thus limiting the environments in which parallel

Status Report on the Development of the Interoperable MPI Specification

June 15, 1999
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
An industry lead effort to create a protocol for the interoperation of MPI (Message Passing Interface) implementations has been ongoing since March of 1997. Meeting have been held several times per year with many implementers of MPI participating to help

Dynamic Load Balancing for Data-Parallel MPI Programs

June 14, 1999
Author(s)
William L. George
This paper describes the dynamic load-balancing support available in DParLib, a library of MPI-basedroutines that support the data-parallel style of programming in MPI (Message Passing Interface).The basic structure of DparLib is described with a focus on

Visualization of Bose-Einstein Condensates

March 1, 1999
Author(s)
Peter M. Ketcham, D L. Feder, W P. Reinhardt, Charles W. Clark, William L. George
A Bose-Einstein condensate (BEC) is a state of matter that exists at extremely low temperatures.BECs are currently under investigation through both numerical simulation and laboratory experiments.The visualization of data generated by numerical simulation

A Java-Based Tool for Testing the Interoperable MPI Protocol

January 12, 1999
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
Java and the World Wide Web are used as the basis of a tool that tests conformance with the InteroperableMessage Passing Interface communication protocol. The user accesses the system through a Java applet thatActs as the interface to a test server that is