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Topic Area: Math

Displaying records 101 to 110 of 237 records.
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101. Measuring the Utility/Path Diversity Tradeoff in Multipath Protocols
Topic: Math
Published: 10/20/2009
Authors: Fern Y Hunt, Vladimir V Marbukh
Abstract: We derive a model of congestion control where the trade-off between utility and path diversity can be investigated. In a network where there can be multiple routes between locations, each source is assigned a route according to a random allocation s ...

102. Fast Iterative Solver for Convection-Diffusion Systems with Spectral Elements
Topic: Math
Published: 10/16/2009
Authors: Aaron Lott, Howard Elman
Abstract: We introduce a solver and preconditioning technique based on Domain Decomposition and the Fast Diagonalization Method that can be applied to tensor product based discretizations of the steady convection-diffusion equation. The method is based on iter ...

103. Volume Estimation of Molded Artifacts by B-Splines
Topic: Math
Published: 10/9/2009
Authors: David E. Gilsinn, Bruce R. Borchardt, Amelia Tebbe
Abstract: The volumes of two industrially molded non-metallic artifacts were estimated using surface data obtained by a coordinate measuring machine. A tensor product of B-splines was used to model the probed data points on the surface and the Divergence Theor ...

104. Bochner Subordination, Logarithmic Diffusion Equations, and Blind Deconvolution of Hubble Space Telescope Imagery and Other Scientific Data
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7632
Topic: Math
Published: 9/23/2009
Author: Alfred S Carasso
Abstract: Generalized Linnik processes and associated logarithmic diffusion equations can be constructed by appropriate Bochner randomization of the time variable in Brownian motion and the related heat conduction equation. Remarkably, generalized Linnik char ...

105. A Combinatorial Approach to Building Navigation Graphs for Dynamic Web Applications
Topic: Math
Published: 9/20/2009
Authors: Raghu N Kacker, David R Kuhn, James F Lawrence, Wenhua Wang, Yu Lei, Sreedevi Sampath
Abstract: Modeling the navigation structure of a dynamic web application is a challenging task because of the presence of dynamic pages. In particular, there are two problems to be dealt with: (1) the page explosion problem, i.e., the number of dynamic pages m ...

106. Modeling Microstructures with OOF2
Topic: Math
Published: 9/1/2009
Authors: Andrew Charles edmu Reid, Rhonald Lua, R E Garcia, Valerie R. Coffman, Stephen A Langer
Abstract: OOF2 is a program for computing the properties and behavior of material microstructures, beginning with an image of the microstructural geometry. OOF2 uses finite elements, but is designed to be used by materials scientists with little or no finite e ...

107. Where the Rubber Meets the Road
Topic: Math
Published: 9/1/2009
Author: Isabel M Beichl
Abstract: This is an editorial on the importance of scientific computing.

108. Estimating Volumes of Simulated Lung Cancer Nodules
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7571
Topic: Math
Published: 7/15/2009
Authors: David E. Gilsinn, Bruce R. Borchardt, Amelia Tebbe
Abstract: Lung cancer is a disease of uncontrolled cell growth in tissues of the lung. Computed tomography (CT) shows promise in detecting lung cancers at earlier, more operable stages, when survival is better. CT scans generate multiple 2-D slice images of th ...

109. Lower Bounds for Accessing Information on Pure Pointer Machines
Topic: Math
Published: 7/13/2009
Authors: Brian Dale Cloteaux, Desh Ranjan
Abstract: We study the complexity of representing an array on a Pure Pointer Machine (PPM) or a pointer machine without arithmetic capabilities. In particular, we show that lower bounds in access time for information retrieval on a PPM arise from two different ...

110. Design of the DEMO Fusion Reactor Following ITER
Series: Journal of Research (NIST JRES)
Topic: Math
Published: 7/1/2009
Authors: Geoffrey B McFadden, Paul R. Garabedian
Abstract: Runs of the NSTAB equilibrium and stability code show there are many 3D solutions of the advanced tokamak problem subject to axially symmetric boundary conditions. These numerical simulations based on mathematical equations in conservation form predi ...

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