Browsing by Subject "Problem solving"
Now showing items 61-80 of 159
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Article
Grid benchmarking: Vision, challenges, and current status
(2007)Grid benchmarking is an important and challenging topic of Grid computing research. In this paper, we present an overview of the key challenges that need to be addressed for the integration of benchmarking practices, ...
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Article
The hp finite element method for problems in mechanics with boundary layers
(1998)Boundary layer phenomena are well-known in the study of fluid flow problems. Perhaps less known, but equally ubiquitous, is their existence in thermal, plate and shell analysis, where they also play a very significant role. ...
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Article
Identification and reconstruction of a small leak zone in a pipe by a spectral element method
(2006)This paper deals with the identification of a zone permitting fluid to leak out of a drain. Using the analogy with crack identification by boundary measurements, we give uniqueness and stability results and we propose an ...
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Article
Implicit-explicit BDF methods for the Kuramoto-Sivashinsky equation
(2004)We consider the periodic initial value problem for the Kuramoto-Sivashinsky (KS) equation. We approximate the solution by discretizing in time by implicit-explicit BDF schemes and in space by a pseudo-spectral method. We ...
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Article
A Kansa-Radial Basis Function Method for Elliptic Boundary Value Problems in Annular Domains
(2015)We employ a Kansa-radial basis function (RBF) method for the numerical solution of elliptic boundary value problems in annular domains. This discretization leads, with an appropriate selection of collocation points and for ...
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Article
LES of the flow past a rectangular cylinder using the immersed boundary concept
(2003)Incompressible turbulent flow past a long square cylinder is investigated using large eddy simulations LES). Results are presented and compared with available experimental databases for a Reynolds number Red = 22 000. The ...
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Conference Object
Longitudinal motion control of air-breathing hypersonic vehicles based on time-varying models
(2006)The non-standard dynamic characteristics of air-breathing hypersonic flight vehicles together with the aerodynamic effects of hypersonic flight make the flight control of such systems highly challenging. Moreover the wide ...
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Article
A matrix decomposition MFS algorithm for axisymmetric potential problems
(2004)The method of fundamental solutions is a boundary-type meshless method for the solution of certain elliptic boundary value problems. By exploiting the structure of the matrices appearing when this method is applied to ...
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Article
A matrix decomposition MFS algorithm for problems in hollow axisymmetric domains
(2006)In this work we apply the Method of Fundamental Solutions (MFS) with fixed singularities and boundary collocation to certain axisymmetric harmonic and biharmonic problems. By exploiting the block circulant structure of the ...
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Conference Object
Matrix decomposition MFS algorithms
(2006)We describe the application of the Method of Fundamental Solutions (MFS) to elliptic boundary value problems in rotationally symmetric problems. In particular, we show how efficient matrix decomposition MFS algorithms can ...
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Article
Matrix decomposition MFS algorithms for elasticity and thermo-elasticity problems in axisymmetric domains
(2007)In this work, we propose an efficient matrix decomposition algorithm for the Method of Fundamental Solutions when applied to three-dimensional boundary value problems governed by elliptic systems of partial differential ...
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Article
A matrix decomposition RBF algorithm: Approximation of functions and their derivatives
(2007)We propose an efficient algorithm for the approximation of functions and their derivatives using radial basis functions (RBFs). The interpolation points are placed on concentric circles and the resulting matrix has a block ...
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Article
Maximum likelihood parameter estimation from incomplete data via the sensitivity equations: the continuous-time case
(2000)This paper is concerned with maximum likelihood (ML) parameter estimation of continuous-time nonlinear partially observed stochastic systems, via the expectation maximization (EM) algorithm. It is shown that the EM algorithm ...
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Article
Method of Fundamental Solutions for axisymmetric elasticity problems
(2000)We investigate the use of the Method of Fundamental Solutions (MFS) for the approximate solution of certain problems of three-dimensional elastostatics in isotropic materials. Specifically, we consider problems in which ...
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Article
The method of fundamental solutions for axisymmetric potential problems
(1999)In this paper, we investigate the application of the Method of Fundamental Solutions (MFS) to two classes of axisymmetric potential problems. In the first, the boundary conditions as well as the domain of the problem, are ...
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Article
The method of fundamental solutions for inhomogeneous elliptic problems
(1998)We investigate the use of the Method of Fundamental Solutions (MFS) for solving inhomogeneous harmonic and biharmonic problems. These are transformed to homogeneous problems by subtracting a particular solution of the ...
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Article
The method of fundamental solutions for scattering and radiation problems
(2003)The development of the method of fundamental solutions (MFS) and related methods for the numerical solution of scattering and radiation problems in fluids and solids is described and reviewed. A brief review of the ...
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Article
The method of fundamental solutions for three-dimensional elastostatics problems
(2002)We consider the application of the method of fundamental solutions to isotropic elastostatics problems in three space dimensions. The displacements are approximated by linear combinations of the fundamental solutions of ...
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Article
Methods of fundamental solutions for harmonic and biharmonic boundary value problems
(1998)In this work, the use of the Method of Fundamental Solutions (MFS) for solving elliptic partial differential equations is investigated, and the performance of various least squares routines used for the solution of the ...
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Article
Methylphenidate and problem solving in children with ADHD: Does equal outcome mean equal process?
(2001)This study examined between-group differences in planning of 9 grade 6 children with attention deficit hyperactivity disorder (ADHD) who were on stimulant medication and a matched comparison group of 9 without ADHD on a ...