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Mathematics & Statistics

Modeling & simulation research

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Displaying 551 - 575 of 906

Assessing Effects of Asymmetries, Dynamics, and Failures on a Cloud Simulator

March 29, 2015

Author(s)

Kevin L. Mills, James J. Filliben, Christopher E. Dabrowski

We characterize the effects of asymmetries, dynamics, and failures when introduced into a cloud computing simulator, which had previously been characterized under static, homogeneous configurations with various patterns of demand and supply. We aim to

A comparison of 3D shape retrieval methods based on a large-scale benchmark supporting multimodal queries

March 27, 2015

Author(s)

Afzal A. Godil

Large-scale 3D shape retrieval has become an important research direction in content-based 3D shape retrieval. To promote this research area, two Shape Retrieval Contest (SHREC) tracks on large scale comprehensive and sketch-based 3D model retrieval have

Multiscale Greens functions for modeling of nanomaterials: Bridging length and time scales

March 17, 2015

Author(s)

Vinod K. Tewary

Green's function gives the response of a system to a probe and is a powerful technique for solving a variety of problems in science and engineering. We describes a multiscale Green's function method for modeling nanomaterials at different length and time

Grain-scale thermoelastic stresses and spatiotemporal temperature gradients on airless bodies, implications for rock breakdown.

February 25, 2015

Author(s)

Stephen A. Langer

Thermomechanical processes such as fatigue and shock have been suggested to cause and contribute to rock breakdown on Earth, and on other planetary bodies, particularly airless bodies in the inner solar system. In this study, we modeled grain-scale

Computing the Time Evolution of the Apparent Viscoelastic/Viscoplastic Poisson's Ratio of Hydrating Cement Paste

February 15, 2015

Author(s)

Li xiodan, Zachary Grasley, Jeffrey W. Bullard, Edward Garboczi

A computational model has been developed that combines finite element methods with microstructure development simulations to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate

Fourier and Gegenbauer expansions for a fundamental solution of Laplace's equation in hyperspherical geometry

February 14, 2015

Author(s)

Howard S. Cohl, Rebekah M. Palmer

For a fundamental solution of Laplace's equation on the R-radius d-dimensional hypersphere, we compute the azimuthal Fourier coefficients in closed form in two and three dimensions, and give an integral representation for the higher dimensions. We also

Randomized methods for rank-deficient linear systems

February 13, 2015

Author(s)

Josef Sifuentes, Zydrunas Gimbutas, Leslie Greengard

We present a simple, accurate method for solving consistent, rank-deficient linear systems, with or without additional rank-completing constraints. Such problems arise in a variety of applications, such as the computation of the eigenvectors of a matrix

Generalizations of generating functions for higher continuous hypergeometric orthogonal polynomials in the Askey scheme

February 9, 2015

Author(s)

Howard S. Cohl, Hans Volkmer, Michael Baeder

We use connection relations and series rearrangement to generalize generating functions for several higher continuous orthogonal polynomials in the Askey scheme, namely the Wilson, continuous dual Hahn, continuous Hahn, and Meixner-Pollaczek polynomials

Thermographic and FE Simulation of the DMLS Process at NIST

February 4, 2015

Author(s)

Brandon M. Lane, Li Ma, Shawn P. Moylan, M A. Donmez, Eric P. Whitenton, Daniel J. Falvey

A major effort of the Measurement Science for Additive Manufacturing Program at NIST is to provide high quality, well-defined temperature measurement of the DMLS process to support and validate multi-physics simulations. However, the dynamic, complex

A Decision Guidance Framework for Sustainability Performance Analysis of Manufacturing Processes

January 10, 2015

Author(s)

Duck B. Kim, Seungjun Shin, Guodong Shao, Alexander Brodsky

Life-Cycle Assessment (LCA) methods are widely used to assess the sustainability of manufacturing processes. Although it has several advantages such as systematic estimation and efficiency, it has significant limitations due to lack of functionality to

An efficient curve evolution algorithm for multiphase image segmentation

January 7, 2015

Author(s)

Gunay Dogan

We propose a novel iterative algorithm for segmentation of multiphase images by curve evolution. Specifically, we address a multiphase version of the Chan-Vese piecewise constant segmentation energy. Our algorithm is efficient: it is based on an explicit

Particle-based simulation of nanoscale systems and materials

January 1, 2015

Author(s)

Alexander Y. Smolyanitsky, Vinod K. Tewary

This book chapter is focused on the introduction of molecular dynamics (MD) and molecular statics (MS), as well as some of their uses for studying the thermomechanical and (indirectly) electronic properties at the nanoscale. We first introduce the general

A Semantic Framework for Modeling and Simulation of Cyber-physical Systems

December 30, 2014

Author(s)

Parastoo Delgoshaei, Mark Austin, Amanda Pertzborn

This paper describes a new semantic platform infrastructure for model-based systems engineering, requirements traceability, and system simulation and assessment of cyberphysical systems (CPSs). When fully developed this environment will support the

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