Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Conjugate Gradients"”.
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Uma estratégia de refinamento auto-adaptativo versão h do método dos elementos finitos aplicada a problemas bi-dimensionais regidos pela equação de campo
… system of equations is solved by Preconditiohed Conjugate Gradients. Several problems are analysed and results compared with the available analytical and numerical solutions.
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Scalable Approximate Inference and Model Selection in Gaussian Process Regression
… iterative methods, especially the method of conjugate gradients, as applied to Gaussian process regression (Gibbs and MacKay, 1997). We primarily focus on improving the reliability of approximate maximum marginal likelihood when using these approximations. We investigate how the method of …
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Improving the Programmability of A Distributed Hardware Accelerator
… for example, it lowers lines of code by 30× for conjugate gradients and 46× for power iteration. Despite this abstraction, generated code achieves 75.7% to 92.6% of the performance of manually written implementations across several benchmarks.
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Nonlinear acceleration methods for even-parity neutron transport
… system, using it as a preconditioner for the conjugate gradients method proves highly efficient and effective and using it directly in a nonlinear solution scheme proves practical but costly. The results for the linear and nonlinear cases serve as the basis for further research into the …
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A new block Krylov subspace framework with applications to functions of matrices acting on multiple vectors
… block Krylov methods, such as O'Leary's block conjugate gradients, global methods, and loop-interchange methods, within this framework. Leveraging the generality of the framework, we develop an efficient restart procedure and error bounds for the shifted block full orthogonalization method …
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Numerical Simulations of Stokes Flow by the Iterations of Boundary Conditions and Finite Difference Methods
… convergence of the approximate methods like the conjugate Gradients of Uzawa (Kobelkov and Olshanskii, 2000). It is therefore important that an algorithm that converges uniformly with respect to the parameter d is considered. The (Chizhonkov and Kargin, 2006) algorithm is typical of such an …
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Parallel and vector algorithms in nonlinear structural dynamics using the finite element method
… (2) The comparison of the preconditioned conjugate gradient method to a representative direct solver. The solution of a linear system of equations is generally required for each equilibrium iteration in a nonlinear analysis. Traditionally, a direct solver has been used to perform this …
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Non-Destructive Testing of metallic structures based on electromagnetic computational methods
… scanning (over a metallic plate) process. The bi-conjugate gradients stabilised (BICGS) method was utilised in solving the equation of finite-element sparse matrices - matrices forms of the Galerkin’s equations (i.e., the fundamental formulas of EM FEM). Conventional methods start iterations with …
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Adaptive sparse representations and their applications
… update step is performed using iterative conjugate gradients. The proposed algorithms give rise to well-conditioned square sparsifying transforms in practice. We show the superiority of our approach over analytical sparsifying transforms such as the DCT for signal and image representation. …
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Adaptive techniques in signal processing and connectionist models
This thesis covers the development of a series of new methods and the application of adaptive filter theory which are combined to produce a generalised adaptive filter system which may be used to perform such tasks as pattern recognition. Firstly, the relevant background adaptive filter theory is …