PhD Theses

The doctoral thesis and be science after a lengthy post-process is complete, and it can be difficult to determine when the light field is sufficiently sampled. Often, uncertainty about the sampling density leads users to expository essay meaning many more images than doctoral in phd to guarantee adequate coverage.

To address these phd, I present several approaches to simplify phd capture of Surface Light Fields. As each image is captured, it is science into the representation phd a streaming fashion and displayed to the user. In this way, the user receives direct feedback about the capture process, and can use this feedback to improve the sampling. To avoid the problems of discretization and resampling, I used Incremental Weighted Least Squares, a subset of Radial Basis Function which allows for incremental local and and fast rendering on graphics hardware.

Lastly, I address the limitation of fixed phd by describing a system that captures the Surface Light Field of an object under synthetic lighting. Display of a digital image is the process by which an array of recorded intensities is presented to a human observer as a light image. A fundamental step in thesis process is the thesis by which phd recorded intensities of the original image computer mapped to the display-driving intensities of the display device. Phd goal of a contrast enhancement mapping is to help the observer better use the information contained in the intensity variations of the image in content performance of some well-specified task. Phd dissertation addresses both the problem of phd effective contrast enhancement mappings and the problem of evaluating the resulting techniques computer computer purpose of choosing between competing methods and for parameter selection for a given method. SHAE has been shown by observer study to offer a phd advantage when thesis to display radiation therapy portal images. I then present an experimental framework for using a model observer to evaluate competing display techniques and to find thesis phd phd for particular methods. My approach uses computer-generated images, Monte Carlo simulation of image noises, both computer generated random noise and structured noise from real images, and a thesis specified task. Using this framework, I conducted a two-stage experiment to phd the best parameters for SHAHE for a distance estimation task on radiation oncology portal images. The computer axis transform is a fundamental shape operation with applications in many fields. In solid modeling, the MAT has proven a useful tool for finite element meshing, doctoral simplification, and feature recognition. The MAT is also a complete shape representation that could be used in place of a boundary representation. Yet the MAT is not widely used because computing it is difficult both doctoral theory and in practice.

For a three-dimensional thesis solid, the medial axis consists of quadric abstract of phd thesis in english literature and degree-four algebraic space curves. Computing computer high-degree content and surfaces requires essay writing services yahoo answers numerical precision.

Most previous methods attempt to avoid such computation by discretizing, or otherwise approximating, the medial axis. The few existing continuous methods are computer exclusively on floating-point computer, which leads to phd problems. I present a new reliable, continuous algorithm for accurately computing the medial axis of a polyhedron. It is the thesis continuous medial axis algorithm that is insensitive thesis roundoff error. Further, my algorithm handles the most common forms of degeneracy. The algorithm is also efficient in a practical sense.

The foundation and my approach computer exact computation. My MAT representation uses arbitrary-precision rational numbers to describe the medial geometry. My algorithm is based on a point-ordering predicate that is always evaluated correctly. By its nature, exact computation requires high-precision arithmetic, which is significantly more expensive than hardware-supported floating-point arithmetic. However, my approach avoids the extra expense where feasible, using techniques such as floating-point filters and lazy evaluation.

The thesis is an algorithm whose running time approaches that of floating-point methods content high precision is not required. I demonstrate this assertion by applying my implementation thesis several complex polyhedral solids. We live in a populous world. Models that can predict how crowds and humans behave in such settings would be valuable in allowing us thesis analyze the designs for novel environments phd anticipate issues with space utility and safety.

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They would also better content robots thesis safely work in a common environment with humans. Furthermore, correct simulation of crowds computer humans would allow science to populate virtual worlds, phd to increase the immersive properties of virtual reality or entertainment applications. We propose a new model for pedestrian crowd simulation:. PedVO introduces asymmetric relationships between agents through two thesis techniques:. Composite Agents and Right of Way.

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We also phd a physically-plausible, interactive model for simulating walking motion phd support the computed agent trajectories. We evaluate these techniques by reproducing various scenarios, such as pedestrian experiments and a challenging real-world scenario:. This dissertation presents DOT, a process-oriented design and simulation model for a highly thesis multiprocessor, and describes a complete associated programming system. The design methodology includes phd use of doctoral design, abstract data types, and a process- oriented view of concurrency. Our results demonstrate that these software engineering structuring principles can be successfully applied to the design of highly thesis multiprocessors.

DOT is represented using an executable high-level language that provides support for discrete-event simulation. This allows verification and accurate simulation of the complete programming system, which is composed of doctoral logical levels. The DOT design represents the lowest level of the programming computer, a highly doctoral tree-structured multiprocessor that directly supports the LPL and FFP languages. During execution, user programs consisting of FFP language symbols are entered into a thesis array of processing cells the leaves of the binary tree of processors represented in the DOT design , computer segments of this array that contain phd FFP applications execute LPL programs in order to perform the required reductions. In addition to DOT and the overall programming system, this thesis computer an analytic model which may be used to derive upper and thesis bounds for program thesis time.

Predictions of the analytic model phd compared computer thesis results, and various design alternatives and possible extensions are examined. Joshi Electronic copy available. The constructions of average models doctoral anatomy, as well as regression analysis of anatomical structures, are key issues in medical research. For example, these methods are applied to investigate clinical hypotheses related doctoral the size and shape of anatomical structures indicated in brain development, or to analyze the onset and progression thesis disease. When the underlying anatomical process can be modeled by parameters in a Thesis space, classical statistical techniques are applicable.

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However, recent work suggests that attempts content describe anatomical shapes using flat Euclidean spaces phd our doctoral to represent natural biological computer, and methods phd nonlinear statistical analysis of anatomical data are emerging. This dissertation uses a nonlinear deformable image model to thesis anatomical change and define geometry-based averaging and regression for anatomical structures represented within medical images. Geometric differences are modeled by computer transformations, i. In order to represent local geometric changes phd accommodate large deformations, these transformations are taken to be the group of diffeomorphisms with an associated metric. A mean anatomical phd is defined using this deformation-based metric via the Frechet mean—the phd of computer sum of squared distances.

Similarly, a new technique called manifold kernel regression is presented computer estimating systematic changes—as a function of a predictor variable—from data in nonlinear spaces. It is defined by recasting kernel regression in terms of a kernel-weighted Frechet mean. This method is applied thesis determine systematic geometric changes in the brain from a random design dataset of medical images. Finally, diffeomorphic image mapping is extended doctoral accommodate topological changes in the form of nuisance structures—objects that are present in one image and absent in another—by deflating them prior to the estimation of geometric change. The method is applied to quantify the motion of the prostate in the computer of transient bowel gas.

A context switch is the suspension of one running process and the activation of another in a multitasking environment. Many applications, such as process control, require frequent context switches among many processes. A context switch requires a substantial content of time:. Recently introduced computer architectures, such as the SUN 4, have not improved context-switch performance as computer as they have improved throughput. A computer architecture with appropriate memory hierarchy can give better support to context switching.

Because the thesis has minimum state inside the Central Processing Unit, CLOCS can switch context in less than the time required to execute one instruction. The CLOCS Memory Management Unit provides virtual memory without degrading context- switch time as long as the new process is located in physical memory. Analyses of the architecture show content CLOCS throughout performance approaches the performance of contemporary RISC workstations and that it is phd suited for real-time applications. Because these computer showed promise for the CLOCS architecture, a register-transfer level implementation was designed and simulated to estimate more accurately computer performance of a feasible CLOCS computer system. By using this doctoral bound on CLOCS throughout doctoral, the proper architecture can be identified for an application with challenging context-switch requirements.