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Improving the Performance of Tensor Matrix Vector Multiplication in Quantum Chemistry Codes.

Description: Cumulative reaction probability (CRP) calculations provide a viable computational approach to estimate reaction rate coefficients. However, in order to give meaningful results these calculations should be done in many dimensions (ten to fifteen). This makes CRP codes memory intensive. For this reason, these codes use iterative methods to solve the linear systems, where a good fraction of the execution time is spent on matrix-vector multiplication. In this paper, we discuss the tensor product fo… more
Date: May 8, 2008
Creator: Gropp, W. D.; Kaushik, D. K.; Minkoff, M. & Smith, B. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Exact Reconstruction From Uniformly Attenuated Helical Cone-Beam Projections in SPECT

Description: In recent years the development of cone-beam reconstruction algorithms has been an active research area in x-ray computed tomography (CT), and significant progress has been made in the advancement of algorithms. Theoretically exact and computationally efficient analytical algorithms can be found in the literature. However, in single photon emission computed tomography (SPECT), published cone-beam reconstruction algorithms are either approximate or involve iterative methods. The SPECT reconstruc… more
Date: December 18, 2008
Creator: Gullberg, Grant T; Huang, Qiu; You, Jiangsheng & Zeng, Gengsheng L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Soft Error Vulnerability of Iterative Linear Algebra Methods

Description: Devices are increasingly vulnerable to soft errors as their feature sizes shrink. Previously, soft error rates were significant primarily in space and high-atmospheric computing. Modern architectures now use features so small at sufficiently low voltages that soft errors are becoming important even at terrestrial altitudes. Due to their large number of components, supercomputers are particularly susceptible to soft errors. Since many large scale parallel scientific applications use iterative li… more
Date: January 19, 2008
Creator: Bronevetsky, G & de Supinski, B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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