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Nonlinear H2/H∞ Constrained Feedback Control: A Practical Design Approach Using Neural Networks, Murad Abu-Khalaf Aug 2005

Nonlinear H2/H∞ Constrained Feedback Control: A Practical Design Approach Using Neural Networks, Murad Abu-Khalaf

Electrical Engineering Dissertations - Archive

In this research, practical methods for the design of H2 and H8 optimal state feedback controllers for constrained input systems are proposed. The dynamic programming principle is used along with special quasi-norms to derive the structure of both the saturated H2 and H8 optimal controllers in feedback strategy form. The resulting Hamilton-Jacobi-Bellman (HJB) and Hamilton-Jacobi-Isaacs (HJI) equations are derived respectively. It is shown that introducing quasi-norms on the constrained input in the performance functional allows unconstrained minimization of the Hamiltonian of the corresponding optimal control problem. Moreover, it is shown how to obtain nearly optimal minimum-time and constrained state controllers …

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Finding Blood In Capsule Endoscopy Video, Jay Frederick Cox Aug 2005

Finding Blood In Capsule Endoscopy Video, Jay Frederick Cox

Computer Science and Engineering Theses - Archive

Capsule Endoscopy (CE) is a new procedure where endoscopists can visualize and discriminate anomalies of the human gastrointestinal track by allowing the patient to swallow a camera pill. The digital video obtained from the pill is used to safely pinpoint the location of these abnormalities in areas previously unavailable for view. One of the main functions of CE is determining the location of bleeding. Given Imaging, currently the only maker of a FDA approved CE device, has a proprietary and unspecified blood test, called Suspected Blood Index, which can be used to automatically detect where blood occurs in the video. …

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An Emperical Evaluation Of Adequacy Criteria For Testing Concurrent Programs, Gaurav Saini Aug 2005

An Emperical Evaluation Of Adequacy Criteria For Testing Concurrent Programs, Gaurav Saini

Computer Science and Engineering Theses - Archive

A concurrent program contains two or more threads that execute concurrently and work together to perform some task. Concurrency increases the efficiency of a program. Testing of concurrent programs has been a challenging task because of the inherent non-determinism. Most approaches proposed for concurrent program testing employ, explicitly or implicitly, a coverage criterion to measure test adequacy. In order to apply those approaches, we must first choose a criterion that suits best for our programs. There is a need for quantitative results of evaluation regarding the effectiveness of the various coverage criteria used for the testing of concurrent programs. Such …

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Low Phase Noise Voltage-Controlled Oscillator Design, Zhipeng Zhu Aug 2005

Low Phase Noise Voltage-Controlled Oscillator Design, Zhipeng Zhu

Electrical Engineering Dissertations - Archive

Two kinds of voltage-controlled oscillators (VCO) - active inductor based VCO and LC cross-coupled VCO - are studied in this work. Although the phase noise performance is not competitive, the proposed active inductor based VCO provide an alternative method to VCO design with very small chip area and large tuning range. The measurement shows a test oscillator based on active inductor topology successfully oscillates near 530MHz band. The phase noise of the widely used LC cross-coupled VCO is extensively investigated in this work. Under the widely used power dissipation and chip area constraints, a novel optimization procedure in LC oscillator …

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Power Management Integrated Circuits Design, Functionality Analysis And Applications, Zheng Li Aug 2005

Power Management Integrated Circuits Design, Functionality Analysis And Applications, Zheng Li

Electrical Engineering Dissertations - Archive

Power management is playing a significant role in modern electronics. Good power management is especially important for portable devices that rely on batteries. By smartly managing how the power is directed to different components of a system, e.g., reducing power to components that are not being used, the efficiency as well as the battery lifetime can be doubled or tripled. There exists a large family of integrated circuits (IC) that are used for power management, e.g., linear regulators, switching regulators, power controllers, hot swap controllers, etc. The voltage reference is one of the key components in this family. For high …

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Comparison Of Search-Based And Kernel-Based Methods For Graph-Based Relational Learning, Chris Manuel Gonsalves Aug 2005

Comparison Of Search-Based And Kernel-Based Methods For Graph-Based Relational Learning, Chris Manuel Gonsalves

Computer Science and Engineering Theses - Archive

Graph-based relational learning has been the focus of relational learning for quite some time. As most of the real-world data is structured, and hence cannot be represented in a single table, various logic-based and graph-based techniques have been proposed for dealing with structured data. Our goal is to perform an in-depth analysis of two such graph-based learning systems. We have selected Subdue to represent the search-based approach and support vector machine (SVM) with graph kernels to represent the kernel-based approach. We perform a comparison between search-based and kernel-based approaches and evaluate their performance in various domains. A search-based approach to …

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A Framework For A Dynamic Invocation Interface And High-Level Interoperability For Mobile Agent Platforms, Vamsi K. Putrevu Aug 2005

A Framework For A Dynamic Invocation Interface And High-Level Interoperability For Mobile Agent Platforms, Vamsi K. Putrevu

Computer Science and Engineering Theses - Archive

The mobile agent paradigm for distributed systems is inherently suitable for many applications ranging from network management to e-commerce. One inherent problem to its wide spread use is communication between disparate agent platforms and reducing overheads while doing the same. Not all platforms for mobile agents are the same. The Mobile Agent Facility (MAF) proposal is an attempt to standardize this execution environment, this thesis proposes a framework extending the current MAF specification, by which inter-agent communication can be achieved in a more scalable fashion by interpreter based mobile agent systems. The future of the Internet depends on its ability …

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The Operation Platform Recommendation For The Deregulated Utility Industry In Thailand, Chai Chompoo-Inwai Aug 2005

The Operation Platform Recommendation For The Deregulated Utility Industry In Thailand, Chai Chompoo-Inwai

Electrical Engineering Dissertations - Archive

Transmission Congestion Management (TCM) plays a significant role in power system operation under today deregulated environment. It has two major functions of an apparatus to keep power system running within acceptable security limits, and of a tool allocating financial obligation to market participants then paying back to transmission grid investors. TCM issue has been widely debating during a past decade, until now, it is still an opened issue extensively discussed in the current structure of competitive environment. In the United State, there are existing two successful stories of TCM under different operation schemes, the former is PJM with Nodal Congestion …

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Monitoring And Analyzing Distributed Cluster Performance And Statistics Of Atlas Job Flow, Sreeranjani Ramprakash Aug 2005

Monitoring And Analyzing Distributed Cluster Performance And Statistics Of Atlas Job Flow, Sreeranjani Ramprakash

Computer Science and Engineering Theses - Archive

Grid3 is a Grid facility used by many High Energy Physics experiments to enable physicists to process data intensive and CPU intensive jobs more effectively as well as more efficiently. Amongst other things, the highlights of Grid3 are participation by more than 25 sites across the U.S. and Korea which collectively provide more than 2000 CPU's, resources used by seven different scientific applications, including three high energy physics simulations and four data analyses in high energy physics, bio-chemistry, astrophysics and astronomy, more than 100 individuals are currently registered with access to the Grid, a peak throughput of 500-900 jobs running …

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Sql-Based Approach To Significant Interval Discovery In Time-Series Data, Sunit Shrestha Aug 2005

Sql-Based Approach To Significant Interval Discovery In Time-Series Data, Sunit Shrestha

Computer Science and Engineering Theses - Archive

With time-series data, events (like turning off a light, opening garage door, turning on TV) occur with a high degree of certainty not at specific time points but within time intervals (sequence of time points). So, it is useful for applications to consider data as contiguous time points. The smallest interval that satisfies the criteria of interval-confidence (i.e., ratio of total support of participating time points and the number of days) is termed as Significant Interval (SI). Significant Interval Discovery (SID) algorithm finds SIs from time-series data. The main focus of this thesis is on the improvement of existing SID …

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Quantitative Comparison Of Two Approaches To Agent Cooperation, Jose Ramon Espino Aug 2005

Quantitative Comparison Of Two Approaches To Agent Cooperation, Jose Ramon Espino

Computer Science and Engineering Theses - Archive

Multi-agent systems (MASs) are characterized by collections of autonomous agents that interact with each other in simple ways, but the collection of agents as a whole is characterized by emergent behavior (EB) which will have properties that individual agents do not. Engineers want to design artificial MASs for a variety of reasons including military operations. The idea is for the EB to be carrying out the mission itself. In this scenario, the agents are relatively inexpensive and expendable. A large body of work exists in MAS research for military applications and a variety of different designs have been proposed. Because …

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Shared Data Acquisition System For Real-Time Power Systems Applications, Yi-Fang Hsu Aug 2005

Shared Data Acquisition System For Real-Time Power Systems Applications, Yi-Fang Hsu

Electrical Engineering Theses - Archive

Digital signal processing chip (DSP's) can be used to perform data analysis computation and have very good performance in real-time system. Digital filters can be designed with consideration of both magnitude and phase responses for digital re-sampling in power system applications. The design consists of two parts: magnitude approximation and group delay compensation. It compromises between the amount of calculation needed to implement the filters and the performance of the filters, which makes the filters good candidates for both real-time and offline applications.

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Utility Based Resource Aware Framework For Information Caching And Sharing In Mobile And Distributed Systems, Huaping Shen Aug 2005

Utility Based Resource Aware Framework For Information Caching And Sharing In Mobile And Distributed Systems, Huaping Shen

Computer Science and Engineering Dissertations - Archive

Along with the technology advancements in mobile and wireless networks, ubiquitous information service is becoming a reality in which users can access the information anytime anywhere. However, the user mobility, network heterogeneity and resource constraints impose significant challenges to provide ubiquitous information services. In this dissertation, a utility based resource aware framework is proposed to enhance ubiquitous information availability to mobile users through data caching and peer-to-peer sharing. The framework considers the constrained resources of mobile and distributed environments and provides flexible, efficient and scalable data access services to the mobile users. The major contributions of this framework are as …

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Efficient And Adaptive Schemes For Consistent Information Sharing In Wireless Mobile And Peer-To-Peer Networks, Zhijun Wang Aug 2005

Efficient And Adaptive Schemes For Consistent Information Sharing In Wireless Mobile And Peer-To-Peer Networks, Zhijun Wang

Computer Science and Engineering Dissertations - Archive

With the tremendous growth of applications in wireless mobile and Peer-to-Peer (P2P) networks, significant research efforts have been made to improve the quality of sevice. Caching and replicating frequently used data objects or files in user's local buffers are popular mechanisms to effectively reduce the communication bandwidth requirement and thus improve the overall system performance. However, the frequent disconnections of users make data consistency a difficult task in wireless mobile and P2P networks. In this dissertation, we design and analyze a Scalable Asynchronous Cache Consistency Scheme (SACCS) for single cell wireless cellular networks. SACCS is a highly scalable, efficient, and …

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Biomechanical Properties Of Anterior Vaginal Wall Tissue In Post-Menopausal Women, Aradhana Bhatt Aug 2005

Biomechanical Properties Of Anterior Vaginal Wall Tissue In Post-Menopausal Women, Aradhana Bhatt

Bioengineering Theses - Archive

Cystocele repair in post-menopausal women suffering from urinary incontinence and associated vaginal prolapse is a common method of palliation. In this method, there is surgical reduction of vaginal tissue and the weak cross-sections are often supported with a synthetic sling fashioned from polymer mesh material. Some sling-supported and unsupported repairs fail over the years. The reasons for these failures are unclear, due in part to a lack of fundamental knowledge of the mechanisms associated with cystocele and vaginal prolapse. The aim of this study was to understand the mechanisms of tissue failure by biomechanical and ultrastructural studies. We take advantage …

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The Introduction Of The Reserve Clause And Its Impact On Baseball Salaries During The 1880s: A Panel Estimation, Jennifer Ashcraft Aug 2005

The Introduction Of The Reserve Clause And Its Impact On Baseball Salaries During The 1880s: A Panel Estimation, Jennifer Ashcraft

Economics Theses - Archive

One of the most frequently studied areas in professional baseball is the Reserve Clause. Originally introduced in 1879 by the National League, the Reserve Clause indefinitely tied a player's services to his current team and was implemented in an attempt to prevent baseball salaries from increasing and reduce team expenses. However, it was also used to control player mobility as well. While the majority of economic research on the Reserve Clause focuses on the post-Reserve Clause era, this paper analyzes the Reserve Clause during its infancy in the 1880s, a period when professional baseball was just beginning, and its impact …

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Connections: Library News For Library Staff Vol. 2, Issue 8, University Of Texas At Arlington Library Aug 2005

Connections: Library News For Library Staff Vol. 2, Issue 8, University Of Texas At Arlington Library

Connections: Library News for Library Staff

The purpose of Connections was to build community within UTA Library staff by reminding people of upcoming events and dates, introducing new staff members, celebrating a department's achievements, and writing about other items of interest.

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Polymer Tube Embedded In-Plane Micropump: Design, Analysis And Fabrication, Ashutosh Kole Aug 2005

Polymer Tube Embedded In-Plane Micropump: Design, Analysis And Fabrication, Ashutosh Kole

Mechanical and Aerospace Engineering Theses - Archive

This thesis presents the design, analysis, and fabrication of a novel polymer tube embedded in-plane micropump. The key component of the proposed micropump is a Parylene polymer tube that is embedded into the trench of a silicon die. Advantages of embedding a Parylene polymer tube are biocompatibility and leakage free environments. The issue of leakage of fluid presented in [1] is eliminated by inserting the polymer tube. The tube itself acts as a diaphragm, which transfers the force and motion of thermal actuators to fluid. The structural analysis and the fabrication of the Parylene tube along with the coupled-field multiphysics …

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Student Athletics Bookmarks, Evelyn Barker Aug 2005

Student Athletics Bookmarks, Evelyn Barker

Information Literacy Resources-Archive

Bookmarks featuring student athletes.

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Multinational Strategies As Options Creation And Exercise: An Analysis Of Country, Industry, And Firm Specific Characteristics, Nattharika Rittippant Aug 2005

Multinational Strategies As Options Creation And Exercise: An Analysis Of Country, Industry, And Firm Specific Characteristics, Nattharika Rittippant

Management Dissertations - Archive

This study investigates international expansion strategies using a real options framework. Decisions to enter foreign markets and their subsequent decision to increase, delay or abandon their commitments are both predicted and evaluated from an options perspective. More specifically, this study attempts to answer the following two questions: (i) How do macro-environmental, industry and firm specific factors impact the real option process of a multinational enterprise (MNE)? (ii) How does the market react to the different option choices? The real options process from the creation of an option to its subsequent exercise was examined along with market reactions following the announcements …

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Analysis And Modeling Of A Micro Variable Capacitance Electromechanical Energy Converter, Amita Jindal Aug 2005

Analysis And Modeling Of A Micro Variable Capacitance Electromechanical Energy Converter, Amita Jindal

Electrical Engineering Theses - Archive

Research and development in microelectromechanical systems (MEMS) have made remarkable progress since 1988. Micro-machines are an integral part of MEMS. However, these machines are not often discussed in most electric machines, power electronics and drive forums due to the relative newness of these machines. This thesis provides an in-depth analysis of a variable capacitance micro-machine (VCM). It gives an insight into the effects of machine geometry, on capacitance and torque profiles of the machine. Tangential and radial components of the electrostatic forces in the air gap of the machine have been investigated to study the effects of mutual flux. These …

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Nonlinear Finite Element Model Analysis Of Human Accommodation Lens, Tri Le Aug 2005

Nonlinear Finite Element Model Analysis Of Human Accommodation Lens, Tri Le

Civil Engineering Theses - Archive

The crystalline human lens is modeled by using the finite element software, ABAQUS/CAE Version 6.5-1 as an axisymmetric shell to study the optical power and displacement of anterior and posterior poles induced due to zonule traction. Several different element types were tested to obtain the optimum mesh. These elements were three and six-noded triangular hybrid and four-noded quadrilateral hybrid for modeling of the cortex and nucleus. Constant strain triangular and regular quadrilateral elements were examined for modeling the capsule. One dimensional two degree of freedom spring elements were used to model the anterior, posterior, and equatorial zonules. Five different lens …

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A Whole New Ballgame: How Fantasy Sports Has Evolved In The Mass Media, Danny Woodward Aug 2005

A Whole New Ballgame: How Fantasy Sports Has Evolved In The Mass Media, Danny Woodward

Communication Theses - Archive

Fantasy sports, a game that allows players to run their own virtual sports franchise, has been considered a hobby enjoyed outside the cultural mainstream. But recent adoption of fantasy sports-related content in the mass media has increasingly made fantasy sports widely accepted. This exploratory study, uses an inductive, qualitative approach, to examine how fantasy sports has evolved in the mass media in seven categories: awareness, interest, testing, adoption, use, benefits, and future projections. Fantasy sports is shown to be more prevalent in the mass media now than ever before, and different media use fantasy sports in different ways but always …

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Cathodic Electrodeposition Of Cadmium Oxide, Zinc Oxide And Mixed Cadmium Oxide-Zinc Oxide Thin Films, Ashwin Seshadri Aug 2005

Cathodic Electrodeposition Of Cadmium Oxide, Zinc Oxide And Mixed Cadmium Oxide-Zinc Oxide Thin Films, Ashwin Seshadri

Material Science and Engineering Theses - Archive

Cadmium oxide (CdO) and (CdO)x(ZnO)1-x mixed semiconductor films were cathodically electrodeposited for the first time on F-doped SnO2 substrates. The CdO thin films were deposited from an aqueous 0.1 M KCl medium containing dissolved Cd2+ species and O2. The (CdO)x(ZnO)1-x mixed oxide films were deposited from a bath which contained Zn2+ in addition to the CdO bath constituents. Films were potentiostatically deposited at 80 0C followed by a post-deposition thermal anneal at 450 0C. The mechanism of the electrodeposition was explored using cyclic voltammetry. These samples were then analyzed by X-ray diffraction, scanning electron microscopy, and UV-visible reflectance spectrophotometry. The …

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Study Of Blast Wave Impact On Concrete, Ajit Geevarghese John Jul 2005

Study Of Blast Wave Impact On Concrete, Ajit Geevarghese John

Mechanical and Aerospace Engineering Theses - Archive

The past decade has brought an upsurge of terrorist attacks throughout the world. A common form of attack is bombings employed against a civilian structure. These bombs lead to blast waves resulting from high explosive bursts in air, causing severe structural damage to buildings that often collapse before evacuation is possible. These blast waves subject the buildings to repeated dynamic loading in the form of reflecting shock waves which then finally lead to their destruction. Many studies have been carried out to understand the static loading of these structures. The current study is to protect existing buildings from an explosion. …

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Research For Dynamic Seal Friction Modeling In Linear Motion Hydraulic Piston Applications, Brian Edward Suisse Jul 2005

Research For Dynamic Seal Friction Modeling In Linear Motion Hydraulic Piston Applications, Brian Edward Suisse

Mechanical and Aerospace Engineering Theses - Archive

This paper presents a unique physics-based analytic model for dynamic seal friction in hydraulic actuators as a function of cylinder pressure, seal material, piston rod dimensions, piston rod seal gland dimensions, and other influencing factors. Results from a series of friction tests are presented. Finite element analysis of an installed seal is used to predict contact stress between the seal and the gland, providing a normal force against the sealing surface. This information is used to determine coefficients of friction within the test specimen. From the analysis, a pressure-sensitive model is generated. The friction model is overlaid on the test …

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Marriage Or Career? Domestic Ideology In George Gissing's The Odd Women, Kuo-Wei Hsu Jul 2005

Marriage Or Career? Domestic Ideology In George Gissing's The Odd Women, Kuo-Wei Hsu

English Theses - Archive

Although George Gissing is acclaimed for his progressive thoughts on liberating women from patriarchy by establishing financial independence, some critics challenge such praise for Gissing by arguing that he is still confined within patriarchal thinking because he still adheres to domestic ideology, which advocates that women should stay within the domestic sphere and be protected from corruption of the outside world. The discussion of this thesis is divided into two main parts: first, despite their efforts to fight for freedom in marriage, women fail to escape from the control of patriarchy because through domestic ideology patriarchy still drives women back …

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Overseas Language Learning Experience: Student Beliefs About Their Teachers' Qualifications, Frank Bradford Bailey Jul 2005

Overseas Language Learning Experience: Student Beliefs About Their Teachers' Qualifications, Frank Bradford Bailey

Linguistics & TESOL Theses - Archive

This study investigates ESL student beliefs about ESL teachers' overseas experience (OE), language learning experience (LLE), and overseas language learning experience (OLLE), the combination of the two, as well as student attitudes toward native-English-speaking teachers. Data is gathered via an online survey from students of university or college-affiliated Intensive English Progams in the United States. The results show that respondents consider OE and LLE to be important experiences for ESL teachers, and strongly prefer native-english-speaking teachers, although non-native-english-speaking teachers have both OE and LLE. Results suggest that OLLE may be considered a separate factor, but sample size was too small …

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Game Theoretical Models And Algorithms For Rate Control In Video Compression, Jiancong Luo Jul 2005

Game Theoretical Models And Algorithms For Rate Control In Video Compression, Jiancong Luo

Computer Science and Engineering Dissertations - Archive

This thesis investigates game theory based rate control algorithms for optimizing the bit allocation in video compression. The first algorithm utilizes the cooperative bargaining game in a MB level rate control algorithm to optimize the perceptual quality while guaranteeing "fairness" in bit allocation among macroblocks. The algorithm first allocates the target bits to frames based on their coding complexity; a method to estimate the coding complexity of the remaining frames is proposed. Next, macroblocks of a frame play cooperative games such that each macroblock competes for a share of resources (bits) to optimize its quantization scale while considering the human …

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Connections: Library News For Library Staff Vol. 2, Issue 7, University Of Texas At Arlington Library Jul 2005

Connections: Library News For Library Staff Vol. 2, Issue 7, University Of Texas At Arlington Library

Connections: Library News for Library Staff

The purpose of Connections was to build community within UTA Library staff by reminding people of upcoming events and dates, introducing new staff members, celebrating a department's achievements, and writing about other items of interest.

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