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Estimation Of Thermal Impedance Parameters Of Silicon Germanium Heterojunction Bipolar Transistors, Arun Thomas Karingada Jan 2011

Estimation Of Thermal Impedance Parameters Of Silicon Germanium Heterojunction Bipolar Transistors, Arun Thomas Karingada

Electrical Engineering Theses - Archive

Silicon Germanium (SiGe) hetero junction bipolar transistors (HBTs) are used in a variety of circuits like analog mixed signal and RF(radio frequency ) circuits. As the device gets smaller these days the self heating affects the performance of the SiGe HBTs. This paper uses theoretical methods based on device geometry and material properties to calculate the thermal resistance and thermal capacitance of SiGe HBT. In addition to theoretical estimations time domain, frequency domain and DC measurements are done on National Semiconductor's CBC8 HBTs which is used to extract the values of thermal impedance parameters.

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Optimal Path Planning, Implementation And Simulation For A Breast Biopsy System, Sridhar Rajaram Jan 2011

Optimal Path Planning, Implementation And Simulation For A Breast Biopsy System, Sridhar Rajaram

Electrical Engineering Theses - Archive

Core needle biopsy is a non-invasive method of confirming the presence of cancer cells in the breast. Image guided breast biopsy is a procedure performed to extract suspicious tissue and test it under the microscope for cancer. Common imaging modalities used are X-ray, MRI and Ultrasound. X-rays and MRI involve ionizing radiation which is harmful when a patient is suspected to have cancer. Apart from this, patients go through much discomfort during biopsy. Sometimes, multiple incisions are required to extract the desired tissue which prolongs the discomfort.This thesis describes a breast biopsy system using Ultrasound images. The main aim of …

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A Mathematical Model For Swine Flu 2009 With Vaccination, Irfan Turk Jan 2011

A Mathematical Model For Swine Flu 2009 With Vaccination, Irfan Turk

Mathematics Theses - Archive

H1N1 influenza is one of the deadliest diseases in human's history. Swine Flu 2009 is the same virus and it was named in 2009. Vaccination is of the most common ways to control a disease. We offer a new vaccination model with recommendations from the US Centers for Disease Control and Prevention (CDC). The entire population is divided into 4 different age groups: one group with no vaccination, one group with 2 doses of vaccination, and two groups with 1 dose of vaccination. We establish that higher levels of vaccination lead to greater savings of life. We also consider the …

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Gender Differences In Emotional Labor, Cara L. Fay Jan 2011

Gender Differences In Emotional Labor, Cara L. Fay

Psychology Dissertations - Archive

This study examined the differences in emotional labor efforts between men and women. Emotional labor refers to the incongruity between experienced emotions and displayed emotions. This "faking" or "acting" that takes place during emotional labor has been found to be correlated with negative work-related outcomes such as job satisfaction, burnout, turnover intentions, and decreased work performance. These outcomes can cost organizations millions of dollars in terms of lost revenue, innovation, and employee-related expenses. Likewise, these outcomes can cost individuals greatly in terms of physical, mental, and emotional well-being. The study sought to experimentally examine how emotional labor differs by gender. …

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Testing The Effects Of Civility And Rationality During Political Contact, Jason R. Popan Jan 2011

Testing The Effects Of Civility And Rationality During Political Contact, Jason R. Popan

Psychology Dissertations - Archive

This research project investigated the effects of civility and rationality of contact between self-identified liberals and conservatives on several outcome measures: participants' evaluations of the political ingroup and outgroup; political attitude certainty; perceived amount of difference between political group members (liberal and conservative); and political identification strength. A 2 (civility: high, low) X 2 (rationality: high, low) experimental design was used in both studies. In Study 1, participants encountered fictitious Internet discussion board posts, with manipulated levels of civility and rationality. Findings from Study 1 did not confirm expectations that exposure to civil and rational civil discourse would lead to …

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Behaviors And Attitudes Related To Youth Runaway Behaviors, Braden Anthony Bozer Jan 2011

Behaviors And Attitudes Related To Youth Runaway Behaviors, Braden Anthony Bozer

Criminology & Criminal Justice Theses - Archive

The purpose of this study was to examine running away behaviors related to certain attitudes and behaviors during childhood and adolescence. Data for this study was collected from 206 students that filled out a self report questionnaire while attending the University of Texas at Arlington during the Fall semester of 2010 or Spring semester of 2011. The main point of this research was to examine attitudes and behaviors that caused participants to have runaway thoughts or actually run away. Other variables observed were gender, family structure, and parent's education level. Two logistic regressions were run. Depression was the behavior that …

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The Impact Of The War On Drugs: African-American Women's Perceptions Through A Phenomenological Approach, Zandra D. Hubbard Jan 2011

The Impact Of The War On Drugs: African-American Women's Perceptions Through A Phenomenological Approach, Zandra D. Hubbard

Criminology & Criminal Justice Theses - Archive

The purpose of this study was to explore the perceptions of African-American women who have been impacted by incarceration based on drug offense. Studies have indicated that in last twenty years, women have been incarcerated at a much higher rate than their male counterparts (Bureau of Statistics Bulletin, 2009; Kappeler & Porter, 2005; Harrison & Beck, 2003).African-American women have the highest imprisonment rate (Tonry, 1995; Nunn, 2002). As a result, this study attempted to portray the impact of the war on drugs on African- American women while considering all the factors relevant to their incarceration phenomenon. This qualitative study was …

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Perceptions Of Terrorism Regarding Fear Of Victimization, Rufus Abraham Jan 2011

Perceptions Of Terrorism Regarding Fear Of Victimization, Rufus Abraham

Criminology & Criminal Justice Theses - Archive

The purpose of this study is to measure perceptions of terrorism in regards to fear of victimization by terrorist organizations among college undergraduates. A quantitative measure of levels of fear of victimization and its possible effects on student behavior will be obtained through the use of a survey instrument. The 120 students will be confidentially surveyed at The University of Texas at Arlington. The experimental group will have nine media photos of major terrorist events attached to their survey. The research team hypothesizes that female undergraduates will have higher rates of fear of victimization than male undergraduates in both groups …

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The Prison On The Moor: A Study Of The American Prisoner-Of-War Experience Within Dartmoor Prison, 1813-1815, Justin Jones Jan 2011

The Prison On The Moor: A Study Of The American Prisoner-Of-War Experience Within Dartmoor Prison, 1813-1815, Justin Jones

History Theses - Archive

The War of 1812 is a conflict best characterized by two adjectives: ironic and forgotten. Conventional histories of the War of 1812 focus almost exclusively on the land engagements of the war, despite the occurrence of several crucial engagements at sea. In what is perhaps the greatest irony of all, one of the most infamous incidents of the war--the shooting of several United States prisoners-of-war at Dartmoor prison in 1815--has received virtually no scholarly attention. The general topic of prisoners-of-war during the War of 1812 has received almost no treatment. Owing to the lack of substantial scholarly literature on Dartmoor …

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An Identifier-Tracking Based Model Reference Adaptive Control Without The Knowledge Of Relative Degree, Xiao Hu Jan 2011

An Identifier-Tracking Based Model Reference Adaptive Control Without The Knowledge Of Relative Degree, Xiao Hu

Electrical Engineering Dissertations - Archive

The purpose of Model Reference Adaptive Control (MRAC) is to create a controller with adjustable parameters to obtain the desired response from a reference model. One of the basic assumptions in MRAC is that the relative degree of the plant is known exactly. However, this assumption is too restrictive for some practical plants, since the relative degree of the plant may not be specified in advance. The study of MRAC with unknown relative degree has been important from both theoretical and practical point of view. This dissertation focuses on a new design approach for the model reference adaptive control of …

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Mixed Integer Programming Models For Selecting Ground-Level Ozone Control Strategies, Wei-Che Hsu Jan 2011

Mixed Integer Programming Models For Selecting Ground-Level Ozone Control Strategies, Wei-Che Hsu

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Under the Clean Air Act (CAA) in 1990, the U.S Environmental Protection Agency (EPA) was required to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants that are considered harmful to public health and the environment. Ground–level ozone was one of the six criteria pollutants monitored by the EPA and considered the most widespread health threat. Two precursors of ground level ozone are nitrogen oxides (NOx) and volatile organic compounds (VOC) and the common sources of these two precursors include on–road vehicles, non–road engines, area sources, point sources, and biogenic and miscellaneous sources. An area …

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The Pmu-Based Parameter Identification For Synchronous Generator Dynamic Model, Chin-Chu Tsai Jan 2011

The Pmu-Based Parameter Identification For Synchronous Generator Dynamic Model, Chin-Chu Tsai

Electrical Engineering Dissertations - Archive

Power systems have become more complex and are found to be consistently operating closer to their stability limits under the deregulated environment. Power system dynamic simulation, which provides significant insight into the dynamic characteristics of system, is one of the most important tools for both planning and operation engineers. Since it heavily relies on the simulation result to make decisions related to operation strategies, grid expansion plain, facility maintenances schedules, an accurate simulation result can avoid unnecessary facility investment and improve the security of the system operation. However, the simulation result is affected by the model and parameters of the …

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Intelligent Control And Cooperation For Mobile Robots, Petru Emanuel Stingu Jan 2011

Intelligent Control And Cooperation For Mobile Robots, Petru Emanuel Stingu

Electrical Engineering Dissertations - Archive

The topic discussed in this work addresses the current research being conducted at the Automation & Robotics Research Institute in the areas of UAV quadrotor control and heterogenous multi-vehicle cooperation. Autonomy can be successfully achieved by a robot under the following conditions: the robot has to be able to acquire knowledge about the environment and itself, and it also has to be able to reason under uncertainty. The control system must react quickly to immediate challenges, but also has to slowly adapt and improve based on accumulated knowledge. The major contribution of this work is the transfer of the ADP …

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Mode Structure Of A Noiseless Phase-Sensitive Image Amplifier, Muthiah Annamalai Jan 2011

Mode Structure Of A Noiseless Phase-Sensitive Image Amplifier, Muthiah Annamalai

Electrical Engineering Dissertations - Archive

Optical parametric amplifiers (OPAs) configured as phase-sensitive amplifiers (PSAs) can be used for noiseless optical image amplification, generation of non-classical states of light, and, in particular, for multimode squeezed light generation. For all these applications and for effective use of the quantum properties of the multimode PSA, we need to know its independently squeezed (or amplified) eigenmodes. First we present the quantum theory of a spatially multimode traveling-wave PSA pumped by a high-power pump beam with arbitrary spatial profile. To quantitatively identify the Green's function of the PSA, we have developed a semi-analytical coupled-mode-theory of the PSA using 2D Hermite-Gaussian …

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Generalized Reinforcement Learning With An Application In Generic Workload Management Systems, Po-Hsiang Chiu Jan 2011

Generalized Reinforcement Learning With An Application In Generic Workload Management Systems, Po-Hsiang Chiu

Computer Science and Engineering Dissertations - Archive

Learning by trial and error and being able to form levels of abstraction from the past experience has been an important factor for sentient beings to develop intelligent behaviors and cope with an ever-changing environment. Complex control domains, in a similar way, often require the interacting agents to learn adaptive control strategies for time-varying or potentially evolving systems. This dissertation will begin by investigating an example of complex domains, Grid computing networks, through a collaborative effort in the design and implementation of a generic workload management system, PanDA-PF WMS used in the ATLAS experiment. With the incentive of boosting the …

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Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary Jan 2011

Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary

Computer Science and Engineering Theses - Archive

Opportunistic networking (ON), a concept which allows a mobile wireless device to dynamically interact with other wireless devices in its immediate vicinity, is a field with great potential to improve the utility of itinerant computational platforms. While ONs increase a device's ability to interact with its peers, the fleeting and intermittent connections between devices make many traditional computer collaboration paradigms, such as distributed shared memory (DSM), virtually untenable. DSM systems, developed for traditional networks, rely on relatively stable, consistent connections among participating nodes. In an ON, connectivity among nodes is distributed in time and space making it useful for delay …

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The Design Of Cmos Impulse Generators For Ultra-Wideband Communication And Radar Systems, Ju-Ching Li Jan 2011

The Design Of Cmos Impulse Generators For Ultra-Wideband Communication And Radar Systems, Ju-Ching Li

Electrical Engineering Dissertations - Archive

Impulse generators play an important role in the ultra-wideband (UWB) systems. Particularly in the transmitter, impulse generator performs an interface between input data and the antenna determining the overall performance of the transmitter. After the federal communication commission (FCC) revised the rules for UWB systems usages, the design of impulse generators has been pursued and yet challenging especially using CMOS technology. In this dissertation, three impulse generators are presented with analytical explanations, simulations, and measurements. First, the design and simulation of an impulse generator using TSMC 0.18 ìm CMOS technology is presented. The operating frequency band of the impulse generator …

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Radar Sensor Networks: Waveform Design, Mimo And Compressive Sensing, Lei Xu Jan 2011

Radar Sensor Networks: Waveform Design, Mimo And Compressive Sensing, Lei Xu

Electrical Engineering Dissertations - Archive

In this dissertation, we have studied totally eight topics which are focused on but not limited to radar sensor networks (RSN) from a signal processing perspective. We propose the definitions of ZCZ/LCZ (Zero Correlation Zone/Low Correlation Zone) sequence-pair sets, provided three methods to construct optimized optimized punctured LCZ/ZCZ sequence-pair sets and study their properties in chapter 2 and 3. We further investigate the waveform design problem for radar system, radar sensor network, sonar sensor network and MIMO radar system from chapter 4 to chapter 7. In addition, we study radar sensor network from the view of information theory in chapter …

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Numerical Modeling Of Microwave Emission From Irregular Layer, Luis Manuel Camacho-Velazquez Jan 2011

Numerical Modeling Of Microwave Emission From Irregular Layer, Luis Manuel Camacho-Velazquez

Electrical Engineering Dissertations - Archive

A numerical approach to model the microwave emission from an irregular layer is developed. The phase matrix of the layer components as well as the emission characteristics are estimated using a numerical approach, namely the Finite-Difference Time-Domain (FDTD) method. The phase matrix is then integrated into a layer model that accounts for the scattering between the layer and ground, using the radiative transfer theory. The effects of interface roughness on emission are incorporated into the model through the surface phase matrices, which are computed using the Integral Equation Model (IEM).The validity of the phase matrices computation is tested against theoretical …

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The Complex Gaussian Scale Mixtures Of Complex Wavelet Coefficients And Applications, Yothin Rakvongthai Jan 2011

The Complex Gaussian Scale Mixtures Of Complex Wavelet Coefficients And Applications, Yothin Rakvongthai

Electrical Engineering Dissertations - Archive

In this thesis, the complex Gaussian scale mixture (CGSM), which is an extension of the Gaussian scale mixture (GSM) for real-valued random variables to the complex case, is presented to model the complex wavelet coefficients. Along with some related propositions and miscellaneous results, the probability density functions (pdf) of the magnitude and phase of the complex random variable are presented. Specifically, the closed forms of the magnitude pdf for the case of complex generalized Gaussian distribution (CGGD) and the phase pdf for the general case are presented. Subsequently, the pdf of the relative phase is derived.Moreover, parameter estimation methods in …

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Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain Jan 2011

Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain

Computer Science and Engineering Theses - Archive

Online social networks (OSNs) today are proprietary, in the sense that communication between users requires the users to be part of the same OSN. This raises privacy issues and reliability concerns among users, and calls for an open, interoperable, and distributed OSN infrastructure that is similar to email and would link different OSNs together. Any decentralized system, however, is vulnerable to Sybil attacks, in which an attacker claims multiple identities, called Sybils, to overwhelm the OSNs and defeat standard techniques used to protect against attacks such as message spam. The state of the art defense against these attacks is SybilInfer, …

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Miniature Wireless Gastrostimulator, Sanchali Deb Jan 2011

Miniature Wireless Gastrostimulator, Sanchali Deb

Electrical Engineering Dissertations - Archive

Gastroparesis is a common disorder caused to patients suffering from diabetes, cancer and Parkinson's disease. Gastric electrical stimulation (GES) has attracted significant attention in the treatment for Gastroparesis. GES inflicts electrical pulses to the stomach tissues to help regain normal motility and hence reduces Gastroparesis symptoms like vomiting, nausea, abdominal bloating etc. Conventional gastric stimulator needs a long surgery to be implanted and it is a big pacemaker like device that runs by a non-rechargeable battery. It has to be replaced once the battery gets exhausted. Hence another round of surgery is done when these devices are needed to be …

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Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere Jan 2011

Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere

Computer Science and Engineering Theses - Archive

As multi core processors become ubiquitous, programs must be designed to utilize the additional power at their disposal. Extracting maximum performance out of these processors requires utilizing latest parallel programming techniques as well as using the latest tools available to increase performance. This thesis delves into enhancing performance of existing programs by applying parallel techniques, utilizing performance analyzers and various other tools developed specially for multi-core system programming. We discuss these techniques and tools and also demonstrate how a Template Analysis program was modified to take advantage of the additional power a multi-core machine has over single core machines to …

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Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj Jan 2011

Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj

Computer Science and Engineering Theses - Archive

The advent of the internet has caused enormous amounts of data available online causing many significant facts to be hidden within this data. Searching for a significant fact within these large datasets is a query intensive process involving large amounts of queries which needs to be executed hence slowing the process of finding the significant facts from a large dataset. In this thesis, a novel approach has been designed exploiting the mathematical characteristics of the data present in the dataset to reduce the number of queries on the dataset. A two phased approach is considered for making fact finding more …

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William Dampier And James Cook: Two Windows Into The British Enlightened Exploration Of The Cultures And Societies Of The Pacific, Colby Ty Smith Jan 2011

William Dampier And James Cook: Two Windows Into The British Enlightened Exploration Of The Cultures And Societies Of The Pacific, Colby Ty Smith

History Theses - Archive

This study looks into the lives of two well-known British explorers and their own observations and interpretations of the Pacific societies and cultures that they encountered on their voyages. More specifically the study has attempted to reveal the similarities and divergences between these two British explorers and their respective interpretations of Pacific natives. Furthermore, the backdrop of Enlightenment thought is used to elucidate a better understanding of the encounters of the two very different societies of Western Europe and the Pacific world during the seventeenth and eighteenth centuries. Finally, this study is important in that it sheds light on the …

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"What Change Hath God Wrought?": How Gender And The Environment Shaped New England Praying Town Identity And Created A Christian Indian Elect, Kallie Kosc Jan 2011

"What Change Hath God Wrought?": How Gender And The Environment Shaped New England Praying Town Identity And Created A Christian Indian Elect, Kallie Kosc

History Theses - Archive

By the 1780s, Christian Indians from praying towns throughout Southern New England accepted an invitation to reside amongst fellow Christianized Oneida in upstate New York. While all parties agreed to live as one "body" with "one head, one heart, one blood," tensions quickly arose between these Christian Indians. While the joint communities of Brothertown, New Stockbridge, and Oneida were intended by the inhabitants to be a place where Christianized natives could form a strong unifying force against Anglo land encroachment, conflict emerged over how to live the proper Christian Indian existence. The two most prominent sources of disagreement between these …

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Localization Of Short Circuit Faults In The Power Distribution Networks, Omkar Deepak Limaye Jan 2011

Localization Of Short Circuit Faults In The Power Distribution Networks, Omkar Deepak Limaye

Electrical Engineering Theses - Archive

This thesis summarizes the research efforts on localizing short-circuit faults in power distribution networks. Specifically, an experimental testbed is constructed to emulate realistic power distribution networks; various short-circuit faults are artificially created in the testbed; voltages/currents are measured over the testbed; and finally, fault localization is achieved by analyzing the measurement data.Two types of power distribution networks are analyzed: serial/radial and grid/mesh networks. In the serial network, a scheme based on terminal voltage and current measurements is developed. Two voltage profiles, namely "forward voltage profile" and "backward voltage profile," are plotted and their intersection is estimated as the fault location. …

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Bridge Monitoring System Using Embedded Computer Vision, Kenan Modi Jan 2011

Bridge Monitoring System Using Embedded Computer Vision, Kenan Modi

Electrical Engineering Theses - Archive

The bridges and overpass are integral part of road network. These structures deteriorate the moment the construction is over. The factors of deterioration are impact loads of vehicles, natural factors such as wind, rain, earthquake, floods, etc. These deterioration leads to structural failures. In order to prevent failures these structure should be periodically monitored and maintained. In this research project a novel method for early detection of bridge failure using computer vision application and 3D road profiling system is proposed. The objective of this research work to check the feasibility of this bridge monitoring system for any structural movement detection. …

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Development Of Prosthetic Skin, Rohit Kilaru Jan 2011

Development Of Prosthetic Skin, Rohit Kilaru

Electrical Engineering Theses - Archive

The objective of this research was to embed tactile sensors in polyimides. This novel method could be utilized to realize prosthetic skin for sensing different kinds of mechanical stimuli. Tactile sensors have an increasing demand in medical sectors: upper and lower-limb prosthetics and in the industrial sectors: robot end-effectors, grippers and manipulators. The sensors developed are targeted for prosthetic arm tactile sensing applications. Current work presents piezoresistive differential pressure sensors fabricated on flexible polyimide film or substrate.A unique technique to bond a flexible superstrate polyimide layer to a MEMS tactile sensor array is presented in this thesis. The sensor is …

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The Effects Of A 15 Week Exercise Intervention On Fitness And Postural Control In Older Adults, Forest Melton Jan 2011

The Effects Of A 15 Week Exercise Intervention On Fitness And Postural Control In Older Adults, Forest Melton

Kinesiology Theses - Archive

Falls are the leading cause of nonfatal injuries in older adults, and often lead to adverse changes in confidence and lifestyle that trigger further declines in postural control. Decreased fitness is associated with poor performance on postural control assessments, especially those that increase task difficulty. The purpose of this study was to analyze the impact of a traditional Group Fitness class and a Wii Fitness exercise program on individual's ability to maintain postural control, with an environmental distracter. 87 community dwelling seniors were randomized into 1 of 3 groups (Control, Wii Fitness, Group Fitness). Interventions were delivered 3 times per …

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