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 21 for “"Surface mesh"”.
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Apple vision pro for intraoperative 3D tumor visualization and surgical guidance
… 3D tumor model onto a patient-specific head surface mesh obtained using LiDAR scanning and machine-learning–based object tracking. A 3D-printed head phantom with an embedded tumor target enabled quantitative evaluation of reconstruction fidelity and spatial anchoring accuracy. Results show …
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Fluid surface reconstruction from particles
… simulations. The key idea is to construct a surface that is as smooth as possible while remaining faithful to the particle locations. We describe a mesh-based algorithm that expresses the surface in terms of a constrained optimization problem. Our algorithm incorporates a secondary …
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Hamiltonian Paths and Strands for Unified Grid Approach for Computing Aerodynamic Flows
… grid solver. A pure quadrilateral/hexahedral mesh is a prerequisite for the line identification and enables approximate factorization along the lines on the unstructured grid. Among various methods, subdivision is the easiest way to obtain a pure quadrilateral/hexahedral mesh from the general …
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A hybrid approach to problems in image processing
… a collection of heterogeneous data points, or a surface mesh embedded in 3D space depending on the specific target problem. The broader framework makes it possible to combine image processing techniques with techniques that are typically applied to other research areas including digital geometry …
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Design optimization using CAD parameterization through CAPRI
… cycle by providing sensitivity derivatives and surface mesh coordinates throughout successive iterations. A sample wing was generated using SolidWorks as the CAD tool and the root and tip sections of a NACA 2412 airfoil. Design optimization was then performed upon this model with tip rotation …
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Real-time enveloping with rotational regression
… a skeleton, which an animator controls, to a 3-D surface mesh, which the audience sees. This process is necessary in most computer graphics applications that involve animated characters. The complexity (and speed) of enveloping solutions vary from photo-realistic muscle simulations used for movie …
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Highly scalable solution of incompressible Navier-Stokes equations using the spectral element method with overlapping grids
… SEM framework. This dissertation also presents a mesh optimizer that has been specifically designed for meshes generated for turbulent flow problems. The optimizer supports surface mesh improvement, which minimizes geometrical approximation errors. The smoother is shown to reduce the computational …
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Unstructured grid technologies for hydrodynamic applications with bodies in relative motion and mesh deformation
… applications with bodies in relative motion and mesh deformation are presented. A parallel universal mesh deformation scheme is developed to manage deforming surface and volume grids for both aerodynamic and hydrodynamic applications. The approach is universal and independent of grid type. Also, …
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Fractional Labelmap Representation of Anatomical Structures
… that triangulates planar contours to closed surface mesh and handles features such as branching, keyhole contours, and end-capping. Closed surfaces were converted into fractional labelmap representations, where each voxel represents occupancy between 0% and 100%. Existing segmentation methods …
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Computer graphics simulation of organic and inorganic optical and morphological appearance changes.
… and the environmental effects on its surface can help improve the realism of computer generated scenes and provide the impression of a living, dynamic environment. The aim of this doctorate thesis is to simulate post mortem processes of the human body and their visual effects on its …
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High-Fidelity Image -Based Modeling
… image silhouettes, we identify rims where the surface grazes the visual hull model, which is then carved by maximizing a photometric consistency score defined over the surface while fixing the identified rims. A local iterative deformation step is finally used to recover fine surface details. …
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On Aerothermal Optimization of Low-Pressure Steam Turbine Exhaust System
… directly builds a mapping relationship between surface mesh and two-dimensional distribution of fluid variables. It can select sensitive geometric features from surface meshes by Graph Neural Networks (GNNs) encoder according to the back-propagated prediction error, which reduces uncertainties …
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Modelling surface evolution coupled with tectonics
This study presents the development of 1D and 2D Surface Evolution Codes (SECs) and their coupling to any lithospheric-scale (thermo-)mechanical code with a quadrilateral structured surface mesh. Both SECs involve diffusion as approach for hillslope processes and the stream power law to reflect …
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Shape optimization using feature-based CAD systems and adjoint methods
… for an infinitesimally small movement of each surface mesh node in the normal direction. The use of adjoint methods results in a computational cost that is essentially independent of the number of design variables, making it ideal for optimization in a large parameter space. <br/>The success of …
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Automated Progress Monitoring Using Mixed Reality
… information from detected floor and wall surfaces. Results showed that this method reduces the time of the initial registration by 58%. Having the 3D model aligned to the real environment and knowing the pose of the camera at every moment, an automated method was developed that exploits …
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High-order hybrid methods using Green's functions and finite elements
… FE solutions on structured or semi-structured meshes. Two main areas of application are considered: a new finite-element-based method for N-body calculations and a new high-order method for elliptic interface problems on non-conforming volume meshes. First, the FE-based …
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Modeling and simulation for signal and power integrity of electronic packages
… for power/ground planes of a PDN. MTEM creates a surface mesh on each plane-pair using dual graphs; a non-uniform triangular mesh (Delaunay triangulation) and its orthogonal counterpart (Voronoi diagram), to which electromagnetic and equivalent circuit concepts are applied. The non-uniform …
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Using the deformable simplicial complex to reconstruct surfaces from point clouds
… complex method that allows it to reconstruct surfaces given only a point cloud extracted from a Wavefront .obj file. By creating a velocity function that moves the vertices of an existing tetrahedral mesh towards their respective closest points in the cloud, we create a final surface that …
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Multi-Scale Modelling of Cold Regions Hydrology
… in CHM, a novel multi-objective unstructured mesh generation software *mesher* is presented. Mesher represents the landscape using a multi-scale, variable resolution surface mesh. It was found that this explicitly captured the spatial heterogeneity important for emergent behaviours and cold …
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Interactions between polyhedral permanent magnets
… also be used to numerically integrate over the surface of another magnet to accurately estimate the force and torque imparted. The second objective was to derive a methodology to model the field due to a polyhedral permanent magnet with non-unity relative permeability. This was done by applying …
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