Using a cluster of computers to run distributed applications imposes a heavy demand on the communication network. In order to improve the communication performance of distributed applications written in MPI, which in turn communicate via TCP, the high speed network must take ad-vangtage of RFC 1323. This paper presents test results to show the increase in… (More)
We have developed a commodity based projection system suitable for group viewing of 3D (stereoscopic) images. Using Linux, multiple projectors, a dual headed X server and multiple video cards, we have achieved a relatively high level of success with local data sets. Using passive polarized glasses and a special silver screen, multiple users view a… (More)
—Parallel and high performance computing has enabled great strides to be made in advancing science and solving large problems. However, this progress is limited by the lack of needed tools and the difficulty of programming and running parallel applications. Specifically, there is a lack of needed steering and visualization tools, which can be easily… (More)
We examine the scalability and performance of a legacy liquid crystal code on a PC (Beowulf) cluster consisting of 16 dual-processor Pentium III/450s. This code was originally designed for use on a Unix workstation cluster of less than 8 machines. In particular, we examine the effectiveness of using potentially more efficient techniques such as non-blocking… (More)
In this paper we present a novel viewer for use with the CUMULVS steering and visualization (STV) middleware for parallel computation. Designed to permit a computational scientist to observe or " view " the data from a running computation, viewers form an integral part of any STV system. The extensible viewer provides a simple event based interface upon… (More)
SUMMARY We will describe a finite difference code for computing equilibrium configurations, of the order-parameter tensor field for nematic liquid crystals, in rectangular regions, by minimization of the Landau-de Gennes Free Energy functional. The implementation of the free energy functional described here includes magnetic fields, quadratic gradient… (More)
We describe a visualization environment for examining the behavior of nematic liquid crystal materials. This permits examination of the local behavior of the solution, which is a tensor, and the identification of properties of physical importance, such as orientation, order, and axiality. KEYWORDS Visualization environment, liquid crystal physics.
Microarrays are important tools in the quest to map the gene regulation networks of cells. A common use of microarrays result in time series pairs that indicates how the output of one gene affects another. Substantial efforts have been made towards identifying pairs of microarray time series that indicate that one gene is a regulator for another. However,… (More)