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.
Results
Showing 1 to 20 of 111 for “"Benchmark problems"”.
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Development of Advanced Nodal Diffusion Methods for Modern Computer Architectures
… computers. Three dimensional realistic benchmark problems can be solved in vectorized mode in less than 0.73 s (33.86 Mflops) on a Cray X-MP/48. Vector-concurrent implementations yield speedups as high as 9.19 on an Alliant FX/8. These results show that the ILLICO method preserves …
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A Quadratic Non-Linear Elasticity Formulation for the Dynamic Behaviour of Fluid-Loaded Structures
… strongly-coupled fluid-structure interaction problems involving long thin structures, which are common multi-physics problems encountered in many applications. In most fluid-structure interaction problems the deformation of the slender elastic bodies is significant and cannot be described by a …
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Um algoritmo paralelo para a solução direta de sistemas de equações do MEF em redes de transputers
… performance measurements were made in different benchmark problems considering various discretizations and network configurations. Good speed-up's were observed in all problems.
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A Portable and Scalable Multigrid Solver for Nonlinear Structural Mechanics Problems
… parallel algorithm is studied using two sets of benchmark problems: fixed-size problems and scaled-size problems. In order to demonstrate portability, three widely used parallel systems; an IBM SP2, an SGI Origin2000 and a CRAY T3E are employed. The obtained results shows that the proposed …
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A genetic algorithm for a setup operator constrained flexible flow shop lot streaming with detached and sequence dependent setups
… The proposed approach is tested on a set of benchmark problems and compared with other solution representations in GA. The results show that the proposed approach can effectively reduce the makespan and improve the overall performance of the scheduling process in flexible flow shop systems …
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Accelerating topology optimization codes using mesh refinement continuation
… up to the order of 106 elements for common benchmark problems. Improvements in speed can be attributed to taking advantage of running code on coarse meshes as a faster way to generate smart initial guesses to be reused as inputs for subsequent runs on finer meshes. A MATLAB script for the …
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Advanced nodal methods for MOX fuel analysis
… outlined in this thesis are applied to several benchmark problems containing MOX and U02 assemblies. These benchmark problems show that the advanced nodal and homogenization methods derived in this thesis produce more accurate results than current analysis methods. With these advanced methods, …
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Implementation and Verification of the Subgroup Decomposition Method in the TITAN 3-D Deterministic Radiation Transport Code
… variable in deterministic particle transport problems. By explicitly preserving reaction rates of the fine-group energy structure, the SDM directly couples a consistent coarse-group transport calculation with a set of fixed-source "decomposition sweeps" to provide a fine-group flux spectrum. …
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Coupled radiation transport and mobile depletion for health physics and environmental impact applications
… transport solver is compared to several benchmark problems to determine its accuracy with and without ray effect mitigation measures, finding good agreement with all the problems tested. The trace species transport solver is then verified with the method of manufactured solutions. The …
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OPTIMIZATION FOR CALIBRATION OF WATER RESOURCES SYSTEMS INCLUDING NEW PARALLEL GLOBAL ALGORITHMS AND APPLICATIONS TO HYDRODYNAMICS AND WATER QUALITY LAKE PDE MODELS
… for computationally expensive optimization problems and applies them to water resources issues. A new parallel surrogate global optimization algorithm PODS is developed and successfully applied to the calibration of two computationally expensive 3D hydrodynamic lake models (5 hours per …
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Numerical investigation of time-integration schemes applicable to fluid-structure interaction
… the fluid dynamics solution algorithm. Several benchmark problems are studied in detail, and results are tabulated and compared. Benchmark examples include the Sod's shock tube problem, a moving cylinder piston configuration, and a fully coupled fluid-structure interaction problem in a …
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Complex fluid dynamical computations via the Finite Volume Method
… results is conducted via the most commonly used benchmark problems. The final aim of our work is to assess the viability and efficiency of our numerical solver via an investigation into the complex fluid dynamical processes associated with shear banding.
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On simulation based verification of nonlinear nondeterministic hybrid systems
… them. Experiments are performed on several benchmark problems including navigation benchmarks, room heating benchmarks, non-linear satellite systems and engine hybrid control systems. The results suggest the algorithm may scale to larger systems. Finally, we present a reachability algorithm …
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A study of the dynamics of shells with boundary layers and a study of the MITC3 shell element
… on the boundary layer phenomenon for two shell benchmark problems: the Scordelis-Lo Roof and the Clamped Hyperboloid.
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Biologically Inspired Optimisation Algorithms for Transparent Knowledge Extraction Allied to Engineering Materials Processing
… framework was tested extensively using several benchmark problems and was compared with other salient techniques. Consistent better performances were obtained. The immune based modelling approach was tested using a set of benchmark problems, and was further applied to different real data sets, …
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A new algorithm for the quantified satisfiability problem, based on zero-suppressed binary decision diagrams and memoization
… ZQSAT can solve some sets of standard QBF benchmark problems (known to be hard for DPLL based algorithms) faster than the best existing solvers. In addition to prenex-CNF, ZQSAT accepts prenex-NNF formulas. We show and prove how this capability can be exponentially beneficial.
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A Method for Image Classification Using Low-Precision Analog Computing Arrays
… learning are developed and tested with two benchmark problems (MNIST hand-written digits and traffic signs). Software simulations evaluate the methods under various defined computation faults. A model-free closed-loop technique is shown to compensate for rather serious computation errors …
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Representation discovery in non-parametric reinforcement learning
… the underlying value function be smooth. Most problems of interest do not satisfy this requirement in their native space, but can be represented in such a way that they do. In this thesis, we show that the ideal representation is one that maps points directly to their values. Existing …
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Partial Order Reduction for Planning
… have also applied these new algorithms to solve benchmark problems across various planning domains. Experimental results have shown significant search cost reduction.
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Mixed Integer Nonlinear Programs: Theory, Algorithms and Applications
… for hyperbolic programs and pooling/blending problems. (2) We develop a theoretical framework for range-reduction and provide a unified treatment of existing and new domain reduction techniques. (3) We develop a finite algorithm for two stage stochastic integer programs where earlier …
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