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 54 for “"B-splines"”.
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Delaunay Configuration B-Splines
The generalization of univariate splines to higher dimensions is not straightforward. There are different approaches, each with its own advantages and drawbacks. A promising approach using Delaunay configurations and simplex splines is due to Neamtu. After recalling fundamentals of univariate …
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Algebraic Grid Generation Using Tensor Product B-Splines
… algorithm uses a mapping composed of bicubic B-splines. Boundary coefficients are chosen so that the splines produce Schoenberg's variation diminishing spline approximation to the boundary. Interior coefficients are initially chosen to give a variation diminishing approximation to the …
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Approximation with interval B-splines for robust reverse engineering
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Blade geometry description using B-splines and general surfaces of revolution
<p>This thesis presents a comprehensive set of algorithms, techniques, and accompanying diagrams for the geometric description of turbomachinery blades. Many of the techniques presented are new and cannot be found in the literature. The geometry construction process is broken into several steps. …
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A three dimensional higher order panel method based on B-splines
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Application of cubic B-splines to boundary value and optimal control problems
… by a variational method using cubic B-splines. This method will then be extended to solving N-dimensional two-point boundary value problems. In the final part of the thesis, certain control problems will be converted into boundary value problems, which in turn, will be approximated by …
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Analysis Driven Shape Design of Parametric Geometry Using B-Splines and Free-Form Deformation
… 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 morph geometry within an FFD box. Analytic geometry inside the FFD box which is not by default …
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Finite elements for higher-order problems in isogeometric analysis and statistical inference
… blending approach that produces smooth blended B-splines, referred to as SB-splines, on unstructured quadrilateral and hexahedral meshes. We first define a set of mixed smoothness quadratic B-splines that are $C^0$ continuous in the unstructured regions of the mesh but are $C^1$ continuous …
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Subdivision, and refinement of non-uniform rational B-spline curves and surfaces in 3-D
… spline formulations and a history of splines, Bezier's cubic spline, and cubic B- splines. This includes uniform rational B-splines and non-uniform rational B-splines, their construction, pros and cons of the different representations, and subdivision and deformation of curves and …
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CINAPACT-Splines: A Family of Infnite Smooth, Accurate and Compactly Supported Splines
… compactly supported C infinite kernels (CINAPACT-splines) whose integer translates form a shift-invariant reconstruction space that can be tuned to achieve any order of accuracy. CINAPACT-splines resemble traditional B-splines in that higher orders of accuracy are achieved by successive …
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Semiparametric Characteristics-based Models of Asset Returns
… The tools extended by this thesis are B-splines and orthogonal series, and multi-variate unknown functions are approximated by tensor products. In terms of high dimensional problems, which are caused by both abundant financial data and diverging B-splines bases used to approximate unknown …
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Energy-Efficient Measurement of Coverage in Distributed Sensor Networks
… sensor node. This thesis proposes the use of B-splines for describing coverage efficiently. The properties of B-splines also enable communication models such as directed diffusion and hierarchical clustering to provide better performance as compared to a centralized scheme. Results obtained from …
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A Partly Linear Model for Censored Regression Quantiles
… (2000) and He and Shi (1996), where normalized B-splines were utilized for the nonparametric estimation. Such quantile regression models can also be useful in exploring the distribution of survival data, typically characterized by right censoring. A method for quantile regression on censored data …
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Solutions of Inequality Constrained Spline Optimization Problems with the Active Set Method
… the bending energy of the curve. Using B-splines as our tools, we give a brief overview of spline properties and develop several different cases of inequality constrained optimization problems of this type. In particular, we develop the active set method and use it to solve these problems, …
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Skinning engineering models with non-uniform, hierarchical B-spline surfaces
… B-spline surfaces. Non-uniform, hierarchical B-splines offer the mechanical designer many advantages: parametrically defined components may be added to a surface while maintaining C² surface continuity; detailed features may be added to a surface without globally affecting the B-spline control …
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Optimal Detection with Imperfect Channel Estimation for Wireless Communications
… complex exponential (GCE) functions, B-splines (BS), and the others. We derive the mean square error (MSE) of a generic BEM-based linear channel estimator with perfect or imperfect knowledge of the Doppler spread in time-variant channels. We compare the performance and complexity of …
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Three Essays in Financial Econometrics
… We approximate the unknown functions by B-splines sieve where the number of B-splines coefficients is diverging. We estimate this model and test the existence of the mispricing function by a power enhanced hypothesis test. The enhanced test solves the low power problem caused by diverging …
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Interaction de l'atome d'hydrogène avec un champ laser intense et bref à dérive de fréquence
… une méthode basée sur les fonctions B-splines qui permet de décrire avec précision l'ensemble de la structure énergétique du système atomique. Dans le second temps, nous développons une approche non perturbative de type spectrale, basée sur la résolution exacte de l'équation de …
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Extraktion physiologischer Koordinatensysteme von Pflanzenwurzeln und -blättern aus Bildsequenzen
… Koordinatenachsen erfolgt in Form von B-Splines, an deren Positionen die mit der Strukturtensormethode berechneten Wachstumskarten abgetastet werden. Damit findet die Koordinatentransformation in das jeweilige physiologische Koordinatensystem statt. Der örtliche Fehler der Transformation …
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