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 20 of 68 for “"energy minimization"”.
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Dislocation structures in materials using grand-canonical minima hopping energy minimization
… to compute the accompanying configurational energy. When the exact defect structure is unknown, methods such as molecular dynamics (MD), Monte Carlo (MC) techniques, or other ad-hoc implementations are used to find the atomistic structure with the lowest energy among all the possibilities …
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Comparison of energy minimization with direct stiffness for linear structural analysis
This study compares energy minimization with direct stiffness for linear structural analysis. The energy minimization approach locates the generalized displacement vector by minimizing the total potential energy of the structure being analyzed. From the survey of variable metric and conjugate …
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A Solution of the Energy Minimization Problem for Codes of Codimension 1
… Delsarte’s linear programming bound to solve the energy minimization problem on codes. Our main contribution is we give the optimal code of codimension 1 for any potential function. We also investigate the polytope of quasicodes, where we give a symmetry and a list of vertices in some special …
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A finite element surface tension model with forces based on surface energy minimization
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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People Tracking Under Occlusion Using Gaussian Mixture Model and Fast Level Set Energy Minimization
Tracking multiple articulated objects (such as a human body) and handling occlusion between them is a challenging problem in automated video analysis. This work proposes a new approach for accurately and steadily visual tracking people, which should function even if the system encounters occlusion …
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From image co-segmentation to discrete optimization in computer vision - the exploration on graphical model, statistical physics, energy minimization, and integer programming
… very familiar with the graphical model and energy minimization point of view in handling computer vision problems - that is, how to combine the local information with the neighborhood interaction information in the graphical system for the inference; and also the author has come to the …
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Efficient inference and learning for computer vision labelling problems
Discrete energy minimization has recently emerged as an indispensable tool for computer vision problems. It enables inference of the maximum a posteriori solutions of Markov and conditional random fields which can be used to model labelling problems in vision. When formulating such problems in an …
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Multistate Computational Protein Design: Theories, Methods, and Applications
… ensemble, coordinate perturbation followed by energy minimization (PertMin), and template, rotamer optimization followed by energy minimization (ROM), generation protocols developed here allow for exploration and manipulation of the structure space enabling the success of these applications.
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The Effect of Hydrogen on The Microstructure of Silicon-Carbide
… model which was constructed using a free energy minimization technique.
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Interval Methods for Reliable Computations of Phase Equilibrium From Equation of State Models
… addressed the phase split problem with the Gibbs energy minimization approach. INTSTAB is first used to obtain all the stationary points. They provide extremely good initial estimates for the equilibrium phase compositions. An enhanced Han-Powell method for successive quadratic programming (SQP) …
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Fabrication, characterization, and wettability analysis of a microstructured hybrid hydrophobic/hydrophilic surface
… and tested for wettability. A model based on energy minimization is referenced and fits well to the experimental data. Experiments suggest a composite interface for droplets resting on the surface due to increasing advancing and receding angles with tower spacing. Future work is anticipated to …
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Engineering strain-induced self-rolling semiconductor tubes through geometry and patterning
… geometries. The study attempts to understand the energy minimization process of strained heterofilms at the nanoscale level and to successfully interpret these phenomena for design and control of semiconductor nanotubes. Generally, III-V compound semiconductor tubes tend to roll up along the …
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A Web Service for Protein Refinement and Refinement of Membrane Proteins
… resolution 1-3Ã… from true structure. Energy minimization methods allow us to refine the proteins and obtain native like structures. Previous work shows that some of these methods performed well on soluble proteins. So we extended this work on membrane proteins. Prediction of membrane …
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Ferrofluid surface and volume flows in uniform rotating magnetic fields
… fields decrease meniscus height. An approximate energy minimization analysis agrees with the observed trends in ferrofluid meniscus height. The effects of ferrofluid meniscus curvature on spin-up flow were modeled under simplified assumptions. Analytical solutions were derived for two dimensional …
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Comparative analysis of deep learning and graph cut algorithms for cell image segmentation
… that addresses the segmentation problem using an energy minimization scheme defined on a weighted graph. Second, we use modern techniques based on deep neural networks, namely U-Net and LSTM that have a time-consuming training and a relatively quick testing phase. Performance of each technique …
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Deformable models using displacement constraints
… of localized forces over multiple timesteps. Energy minimization techniques may also achieve certain global effects, but at a higher computational cost. We introduce a multilevel approach to force distribution to improve the global response of a deformable object. External forces acting on an …
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The Volumetric Properties for Selected Impurities in Dense CO2 Destined for Re-Injection
… the mixing coefficients for reference Helmholtz Energy Equations of State and Fluctuation Solution Theory models. The optimized mixing parameters were validated by comparison to existing density measurements and/or bubble / dew point data. Finally, the mixing coefficients were utilized in a Gibbs …
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Hydrogen migration in monoclinic ZrO₂ and the effects of defects and dopants assessed by first-principles calculations
… to take in the structure are determined based on energy minimization. Barriers and saddle point configurations of elemental diffusion paths are obtained using the nudged elastic band method. Each extended diffusion path can be constructed from these elemental migration steps ...
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Phenomenology and kinematics of discrete plastic deformation events in amorphous silicon : atomistic simulation using the Stillinger-Weber potential
… deformed by conjugate gradient static energy minimization. Atomic level analysis was carried out using appropriately generalized notions of stress and strain. Plastic deformation was found to occur in a series of discrete stress relaxations, each one of which was accompanied by a well …
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Mechanisms of plastic deformation in amorphous silicon by atomistic simulation using the Stillinger-Weber potential
… in a-Si in deformation simulations by potential energy minimization. These relaxations are triggered when a local yielding criterion is satisfied in a small cluster of atoms. The atomic rearrangements accompanying discrete stress relaxations are describable as autocatalytic avalanches of unit …
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