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 “"Free-form deformation"”.
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Analysis Driven Shape Design of Parametric Geometry Using B-Splines and Free-Form Deformation
… solid model geometry construction with free-form-like local deformation. One method explored uses the control point locations of certain B-splines defining the geometry as design parameters during optimization. A second approach builds on this method, using free-form deformation (FFD) to …
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Compressed Sensing Based Image Restoration Algorithm with Prior Information: Software and Hardware Implementations for Image Guided Therapy
… present the integrated software and hardware platform for developing a total-variation based image restoration algorithm by applying prior image information and free-form deformation fields for image guided therapy. The core algorithm we developed solves the image restoration problem for handling …
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Impact of turbulence models and shape parameterization on robust aerodynamic shape optimization
"Aerodynamic design optimization is typically performed at fixed flight conditions, without considering the variation and uncertainty in operating conditions. The objective of robust aerodynamic optimization is to design an aerodynamic configuration, which will keep its optimum performance under …
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Development of a statistical shape and appearance model of the skull from a South African population
… segmentation and processing; 2) Development of a free-form deformation (FFD) model for establishing correspondence across the training dataset; and 3) Development and validation of a SSM from the corresponding dataset. The SSM was validated using the leave one-out cross-validation method. The …
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2D and 3D surface image processing algorithms and their applications
… An image registration process finds the transformation between each pair of range views. To model an object, a common reference frame in which all views can be transformed must be defined. After the registration, the range views should be integrated into a non-redundant model. Optimization is …
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Shape Optimization of Annular Combustors with an Open Source Parallelized Thermoacoustic Helmholtz Solver
… solver uses DOLFINx and UFL from FEniCSx. The performance, validity, stability and extensibility of the solver are demonstrated through several examples of thermoacoustic instability, from the one-dimensional Rijke tube to the three-dimensional MICCA combustor. The implementation of Bloch-type …
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Optimization of Image Guided Radiation Therapy for Lung Cancer Using Limited-angle Projections
<p>The developments of highly conformal and precise radiation therapy techniques promote the necessity of more accurate treatment target localization and tracking. On-board imaging techniques, especially the x-ray based techniques, have found a great popularity nowadays for on-board target …
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Isogeometric Design, Analysis and Optimisation of Lattice-Skin Structures
… of lattice-skin structures using the free-form deformation (FFD) technique is studied. The corresponding shape sensitivity of lattice-skin structures is derived. The geometry update of the lattice-skin structure is determined by the deformation of the FFD control volume, and in this …
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Motion compensation from limited data for reference-constrained image reconstruction
… We also analyze the characteristics and performance of the proposed method by an estimation-theoretic approach and by computer simulations. We demonstrate accurate motion parameter estimation for an affine transformation model and a nonrigid deformable model.
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Investigation Into The Relationship Between Intestinal Slow Waves, Spike Bursts, and Motility
… electrophysiological studies are generally performed separately from motility measurements, and there is a need to integrate these two modalities to understand the electrophysiological basis of motility. A limited number of simultaneous electrophysiological and motility studies exist, but are …