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 9 of 9 for “"Fast Marching Method"”.
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Model-based cardiac CT segmentation and 3D heart reconstruction
… To solve this problem, this thesis proposes a fast marching method driven by Gaussian mixture models (GMM) to segment hepatic vein from CT images. Anisotropic smoothing is applied to the original CT data to remove the noise. After that, GMMs are built for both hepatic vein area and non-hepatic …
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Statistical field estimation and scale estimation for complex coastal regions and archipelagos
… without going across complex land-forms. New methods for OA based on estimating the length of optimal shortest sea paths using the Level Set Method (LSM) and Fast Marching Method (FMM) are derived, implemented and utilized in general idealized and realistic ocean cases.
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Fast Path Planning in Uncertain Environments: Theory and Experiments
… This work is motivated by the need for fast autonomous vehicles that require planning algorithms to operate as quickly as possible. In this dissertation, we first study the case in which there are only static obstacles in the environment. We propose a hybrid receding horizon control path …
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A Fire Simulation Model for Heterogeneous Environments Using the Level Set Method
… complexity of fire behaviors. The raster-based method and the vector-based method are two major approaches that allow one to perform computerized fire spread simulation. In this thesis, we present a scheme we have developed that utilizes a level set method to build a fire spread simulation …
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Tomographic Imaging Associated with a Mw 2.6 Fault-Slip Event in a Deep Nickel Mine
… a tomographic inversion scheme using the Fast Marching Method for raypath tracing and the Simultaneous Iterative Reconstruction Technique to solve the p-wave velocity model of an underground mine and surrounding rock mass. The inversion scheme presented is tested using a data set from …
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A Parallel Boundary Conforming Method on Adaptive Moving Meshes for Multiphase Flows
… presents a novel parallel boundary conforming method for simulating two-dimensional incompressible flows on adaptive moving unstructured meshes. The proposed method is especially helpful for studying immiscible multiphase flow problems as the interfaces are represented explicitly by mesh lines, …
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Diffusion Tensor Imaging: Evaluation of Tractography Algorithm Performance Using Ground Truth Phantoms
… loss of validity in the diffusion tensor model. Fast Marching Tractography (FMT) algorithms based on fast marching level set methods have been proposed to better handle the presence of IVOH in DTI data when compared to older Streamline Tractography (SLT) methods. However, the actual performance …
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Exploring anisotropy in rock fluid flow and elastic behavior
… the initial reservoir flow behavior. Various methods for modeling the change in permeability throughout the reservoir development are then explored. As hydrocarbons are produced and reservoir pressure depletes, the change in stress state induces a change in the reservoir permeability. The …
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Fast numerical algorithms for optimal robot motion planning
Optimization of high-level autonomous tasks requires solving the optimal motion planning problem for a mobile robot. For example, to reach the desired destination on time, a self-driving car must quickly navigate streets and avoid hazardous obstacles such as buildings or other cars, as well as …