Physical Sciences and Mathematics Commons^™

Bm3d Image Denoising Using Ssim Optimized Wiener Filter, Mahmud Hasan

Electronic Thesis and Dissertation Repository

Image denoising is considered as a salient pre-processing in sophisticated imaging applications. Over decades, numerous studies have been conducted in denoising. Recently proposed Block Matching and 3D (BM3D) Filtering added a new dimension to the study of denoising. BM3D is the current state-of-the-art of denoising and is capable of achieving better denoising as compared to any other existing method. However, the performance is not yet on the bound for image denoising. Therefore, there is scope to improve BM3D to achieve high quality denoising. In this thesis, to improve BM3D, we first attempted to improve Wiener filter (the core of BM3D) …

Dynamic Resource Management In Virtualized Data Centres, Gaston Keller

Electronic Thesis and Dissertation Repository

In the last decade, Cloud Computing has become a disruptive force in the computing landscape, changing the way in which software is designed, deployed and used over the world. Its adoption has been substantial and it is only expected to continue growing. The growth of this new model is supported by the proliferation of large-scale data centres, built for the express purpose of hosting cloud workloads. These data centres rely on systems virtualization to host multiple workloads per physical server, thus increasing their infrastructures' utilization and decreasing their power consumption. However, the owners of the cloud workloads expect their applications' …

Energy Based Multi-Model Fitting And Matching Problems, Hossam N. Isack

Electronic Thesis and Dissertation Repository

Feature matching and model fitting are fundamental problems in multi-view geometry. They are chicken-&-egg problems: if models are known it is easier to find matches and vice versa. Standard multi-view geometry techniques sequentially solve feature matching and model fitting as two independent problems after making fairly restrictive assumptions. For example, matching methods rely on strong discriminative power of feature descriptors, which fail for stereo images with repetitive textures or wide baseline. Also, model fitting methods assume given feature matches, which are not known a priori. Moreover, when data supports multiple models the fitting problem becomes challenging even with known matches …

Proxy-Based Mobile Computing Infrastructure, Azade Khalaj

Electronic Thesis and Dissertation Repository

In recent years, there has been a huge growth in mobile applications. More mobile users are able to access Internet services via their mobile devices e.g., smartphones ans tablets. Some of these applications are highly interactive and resource intensive. Mobile applications, with limited storage capacity, slow processors and limited battery life, could be connected to the remote servers in clouds for leveraging resources. For example, weather applications use a remote service that collects weather data and make this data available through a well-defined API. This represents a static partitioning of functionality between mobile devices and a remote server that is …

The Electrochemistry Of Hydrogen Peroxide On Uranium Dioxide And The Modelling Of Used Nuclear Fuel Corrosion Under Permanent Disposal Conditions, Linda Wu

Electronic Thesis and Dissertation Repository

This thesis reports a series of investigations examining the corrosion process of used nuclear fuel under permanent disposal conditions. The motivation of the project is that the safety assessment of deep geological disposal of spent nuclear fuel requires a fundamental understanding of the processes controlling fuel corrosion which could lead to the release of radionuclides to the geosphere from a failed container.

One primary objective of this project was to develop a computational model in order to simulate fuel corrosion under the disposal conditions. A series of simulations based on COMSOL were designed and developed to determine the influence of …

Optimizing The Analysis Of Electroencephalographic Data By Dynamic Graphs, Mehrsasadat Golestaneh

Electronic Thesis and Dissertation Repository

The brain’s underlying functional connectivity has been recently studied using tools offered by graph theory and network theory. Although the primary research focus in this area has so far been mostly on static graphs, the complex and dynamic nature of the brain’s underlying mechanism has initiated the usage of dynamic graphs, providing groundwork for time sensi- tive and finer investigations. Studying the topological reconfiguration of these dynamic graphs is done by exploiting a pool of graph metrics, which describe the network’s characteristics at different scales. However, considering the vast amount of data generated by neuroimaging tools, heavy computation load and …

Extracting Vessel Structure From 3d Image Data, Yuchen Zhong

Electronic Thesis and Dissertation Repository

This thesis is focused on extracting the structure of vessels from 3D cardiac images. In many biomedical applications it is important to segment the vessels preserving their anatomically-correct topological structure. That is, the final result should form a tree. There are many technical challenges when solving this image analysis problem: noise, outliers, partial volume. In particular, standard segmentation methods are known to have problems with extracting thin structures and with enforcing topological constraints. All these issues explain why vessel segmentation remains an unsolved problem despite years of research.

Our new efforts combine recent advances in optimization-based methods for image analysis …

Oligonucleotide Design For Whole Genome Tiling Arrays, Qin Dong

Electronic Thesis and Dissertation Repository

Oligonucleotides are short, single-stranded fragments of DNA or RNA, designed to readily bind with a unique part in the target sequence. They have many important applications including PCR (polymerase chain reaction) amplification, microarrays, or FISH (fluorescence in situ hybridization) probes. While traditional microarrays are commonly used for measuring gene expression levels by probing for sequences of known and predicted genes, high-density, whole genome tiling arrays probe intensively for sequences that are known to exist in a contiguous region. Current programs for designing oligonucleotides for tiling arrays are not able to produce results that are close to optimal since they allow …

Accessibility Of E-Commerce Websites For Vision Impaired Persons, Roopa Bose

Electronic Thesis and Dissertation Repository

In this thesis accessibility problems with websites for vision-impaired persons are discussed in detail. General accessibility problems and those specific to e-commerce websites,especially on-line shopping websites are discussed. Accessibility problems are analyzed from the perspective of a screen reader user. As a solution for the accessibility problems identified, the WCAG 2.0 guidelines are reviewed and new changes are proposed to improve the existing guidelines. Enhanced solutions using tactile media capable of providing a better web browsing experience for vision-impaired persons are also discussed.