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Topic Area: Modeling

Displaying records 101 to 110 of 138 records.
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101. Measuring the Utility/Path Diversity Tradeoff in Multipath Protocols
Topic: Modeling
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904662

102. Fast Iterative Solver for Convection-Diffusion Systems with Spectral Elements
Topic: Modeling
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901466

103. Spectrum Simulation in DTSA-II
Report Number: 832430
Topic: Modeling
Published: 10/1/2009
Author: Nicholas W m Ritchie
Abstract: Spectrum simulation is a useful practical and pedagogical tool. Particularly with complex samples or trace constituents, a simulation can help to understand the limits of the technique and how to optimize the tools for the optimal measurement. DTSA- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832430

104. Gauging the Repeatability of 3D Imaging Systems by Sphere Fitting
Topic: Modeling
Published: 9/30/2009
Authors: Marek Franaszek, Geraldine S Cheok, Kamel Shawki Saidi
Abstract: Multiple scans of the same object acquired with 3D imaging system (e.g., laser scanner) in the same experimental conditions could provide valuable information about the instrument s performance (e.g., stability, existence of bias, measurement error). ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903444

105. Parallelizing a Micromagnetic Program for Use on Multi-processor Shared Memory Computers
Topic: Modeling
Published: 9/22/2009
Author: Michael J Donahue
Abstract: Parallelization of a finite difference micromagnetic program on shared memory computer systems is studied. Efficiency is found to be limited by memory bandwidth, and techniques are introduced to reduce memory traffic. Computations are sped up by a fa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902207

106. A Combinatorial Approach to Building Navigation Graphs for Dynamic Web Applications
Topic: Modeling
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902865

107. Estimating Volumes of Simulated Lung Cancer Nodules
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7571
Topic: Modeling
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901958

108. Design of the DEMO Fusion Reactor Following ITER
Series: Journal of Research (NIST JRES)
Topic: Modeling
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902386

109. Sensitivities and Variances for Fitted Parameters of Spheres
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7616
Topic: Modeling
Published: 7/1/2009
Authors: Christoph Johann Witzgall, Marek Franaszek
Abstract: Experimental data have been gathered by applying 3D imaging systems, such as LIDAR/LADAR instruments, to spherical objects. This report provides a compilation of the statistical and analytical procedures to be used for an evaluation, to be reported ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903340

110. Atmospheric Retention of Man-made CO^d2^ Emissions
Topic: Modeling
Published: 6/8/2009
Author: Bert W Rust
Abstract: Rust and Thijsse have shown that global annual average temperature anomalies T(t^di^) vary linearly with atmospheric CO^d2^ concentrations c(t^di^). The c(t^di^) can be related to man-made CO^d2^ emissions F(t^di^) by a linear regression model whose ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902110



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