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Mathematics & Statistics

Modeling & simulation research

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Displaying 476 - 489 of 489

Approximating Limit Cycles of a Van der Pol Equation with Delay

January 15, 2004

Author(s)

David E. Gilsinn

In this paper a theorem of Stokes is used to establish the existence of a periodic solution of a Van der Pol equation with fixed delay in the neighborhood of an approximating solution that satisfies a certain noncriticality condition.

Using Nanoscillatory Splines to Model Urban Environments

January 15, 2004

Author(s)

David E. Gilsinn, Marjorie A. McClain, Christoph J. Witzgall

Constructing Sequence Alignments from a Markov Decision Model with Estimated Parameter Values

January 1, 2004

Author(s)

Fern Y. Hunt, Anthony J. Kearsley, Agnes A. O'Gallagher

Current methods for aligning biological sequences are based on dynamic programming algorithms. If large numbers of sequences or a number of long ones are to be aligned the required computations are expensive in memory and CPU time. In an attempt to bring

Constructing Sequence Alignments from a Markov Decision Model with Estimated Parameter Values

January 1, 2004

Author(s)

Fern Y. Hunt, Anthony J. Kearsley, Agnes A. O'Gallagher

Deconvolving LADAR Images Of Bar Codes for Construction Site Object Recognition

October 1, 2003

Author(s)

David E. Gilsinn, Geraldine S. Cheok, Dianne M. O'Leary

This report discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR optics. The first part of this report describes the experimental data collection of several bar code images along with

An Optimization Approach to Multiple Sequence Alignment

July 1, 2003

Author(s)

Fern Y. Hunt, Anthony J. Kearsley, H H Wan

The problem of multiple sequence alignment is recast as an optimization problem using Markov decision theory. One seeks to minimize the expected or average cost of alignment subject to data-derived constraints. In this setting the problem is equivalent to

A Linear Programming Based Algorithm for Multiple Sequence Alignments

February 17, 2003

Author(s)

Fern Y. Hunt, Agnes A. O'Gallagher, Anthony J. Kearsley

Reconstructing Images of Bar Codes for Construction Site Object Recognition

September 1, 2002

Author(s)

David E. Gilsinn, Geraldine S. Cheok, Dianne M. O'Leary

This paper discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADARoptics. The first part of this paper describes the experimental data collection of several bar code images along with

Comparative Statistical Analysis of Test Parts Manufactured in Production Environments

June 1, 2002

Author(s)

David E. Gilsinn, Alice V. Ling

Estimating error uncertainties arising in parts produced on machine tools in production machine shops is not a well understood process. The current study details a process of estimating these error uncertainties. A part with significant features was

Estimating Critical Hopf Bifurcation Parameters for a Second Order DelayDifferential Equation with Application to Machine Tool Chatter

May 1, 2002

Author(s)

David E. Gilsinn

Nonlinear time delay differential equations are well known to have arisen in models in physiology, biology and population dynamics. They have also arisen in models of metal cutting processes. Machine tool chatter, from a process called regenerative chatter

Constructing Sibson Elements for a Rectangular Mesh

February 1, 2001

Author(s)

David E. Gilsinn

This paper documents the construction of a finite element, called the Sibson element. The shape function of this element is formed on rectangular grids by C 1 splines defined on a triangulation of each subrectangle by dividing it into four subtriangles

Multiresolution Representation of Urban Terrain By L^1^ Splines, L^2^ Splines, and Piecewise Planar Surfaces

December 11, 2000

Author(s)

J E. Lavery, David E. Gilsinn

Cubic L 1 and L 2 interpolating splines based on C 1 smooth piecewise cubic Sibson elements on a tensor-product grid are investigated. Computational tests were carried out for a 102.4 km area of Fort Hood, Texas represented by a 1025 x 1025 set of 100

The OOF Manual: Version 1.0

November 1, 1998

Author(s)

W C. Carter, Stephen A. Langer, Lin-Sien H. Lum

Dielectric Breakdown in a Simplified Parallel Model

June 1, 1998

Author(s)

H A. Fowler, J E. Devaney, John G. Hagedorn, F Sullivan

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