Low Complexity Avs-M Using Machine Learning Algorithm C4.5,
2011
University of Texas at Arlington
Low Complexity Avs-M Using Machine Learning Algorithm C4.5, Pragnesh Ramolia
Electrical Engineering Theses - Archive
AVS China is the latest video coding standard developed by the AVS work group of China employing the latest video coding tools for achieving high compression while preserving the quality of the video [15]. AVS China video standard has been proven superior to the existing video standards such as MPEG-2 and MPEG-4 part 2, in terms of reduced complexity and coding efficiency. AVS is a set of integrated standard system which contains systems, video, audio and media copyright management. AVS-M, the 7th part of the system is video codec targeting mobile devices. AVS-M uses high efficiency tools like macroblock portioning, …
Estimation Of Thermal Impedance Parameters Of Silicon Germanium Heterojunction Bipolar Transistors,
2011
University of Texas at Arlington
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.
Optimal Path Planning, Implementation And Simulation For A Breast Biopsy System,
2011
University of Texas at Arlington
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 …
An Identifier-Tracking Based Model Reference Adaptive Control Without The Knowledge Of Relative Degree,
2011
University of Texas at Arlington
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 …
The Pmu-Based Parameter Identification For Synchronous Generator Dynamic Model,
2011
University of Texas at Arlington
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 …
Intelligent Control And Cooperation For Mobile Robots,
2011
University of Texas at Arlington
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 …
Mode Structure Of A Noiseless Phase-Sensitive Image Amplifier,
2011
University of Texas at Arlington
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 …
The Design Of Cmos Impulse Generators For Ultra-Wideband Communication And Radar Systems,
2011
University of Texas at Arlington
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 …
Radar Sensor Networks: Waveform Design, Mimo And Compressive Sensing,
2011
University of Texas at Arlington
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 …
Numerical Modeling Of Microwave Emission From Irregular Layer,
2011
University of Texas at Arlington
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 …
The Complex Gaussian Scale Mixtures Of Complex Wavelet Coefficients And Applications,
2011
University of Texas at Arlington
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 …
Miniature Wireless Gastrostimulator,
2011
University of Texas at Arlington
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 …
Localization Of Short Circuit Faults In The Power Distribution Networks,
2011
University of Texas at Arlington
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. …
Bridge Monitoring System Using Embedded Computer Vision,
2011
University of Texas at Arlington
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. …
Development Of Prosthetic Skin,
2011
University of Texas at Arlington
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 …
Investigating The Implementation Of Usaf Damage Tolerant Risk Analysis With A Structural Health Monitoring System,
2011
University of Texas at Arlington
Investigating The Implementation Of Usaf Damage Tolerant Risk Analysis With A Structural Health Monitoring System, Jeffrey Scott Tippey
Electrical Engineering Theses - Archive
The recent improvements in micro fabrication, power management, and distributed sensor networks have made Structural Health Monitoring (SHM) an appealing solution for decreasing costs, decreasing risk of catastrophic failure, and improving overall aircraft health and maintenance (Mukkamala, 2000). A SHM system uses non-destructive inspection (NDI) to provide on-demand updates on the health of a structure, such that the integrity of the structure can be quantified and accounted for (Achenback, 2009). In order to provide an accurate representation of a structure's health, a distributed network of sensors must work in unison to detect a distribution of cracks and damage present on …
Temperature And Frequency Dependence Of Thermal Impedance In Dielectrically Isolated Sige Hbts,
2011
University of Texas at Arlington
Temperature And Frequency Dependence Of Thermal Impedance In Dielectrically Isolated Sige Hbts, Valay Dineshbhai Shah
Electrical Engineering Theses - Archive
Silicon Germanium (SiGe) heterojunction bipolar transistors (HBTs) have been designed to cater the demand of high speed circuits having applications in wireless and optical communication. Due to higher cut-off frequencies and high speed applications, self heating plays a significant role in the performance of SiGe HBTs. This thesis paper does an extensive analysis on the effect of self heating and used different DC, time domain and frequency domain methods to extract the self heating parameters thermal resistance (Rth) and thermal capacitance (Cth). The VBIC (Vertical Bipolar Inter Company) model is used for all the simulations. Simulations are performed using ICCAP …
Elimination Theory For Nonlinear Parameter Estimation,
2011
Boise State University
Elimination Theory For Nonlinear Parameter Estimation, John Chiasson, Ahmed Oteafy
Electrical and Computer Engineering Faculty Publications and Presentations
The work presented here exploits elimination theory (solving systems of polynomial equations in several variables) [1][2] to perform nonlinear parameter identification. In particular show how this technique can be used to estimate the rotor time constant and the stator resistance values of an induction machine. Although the example here is restricted to an induction machine, parameter estimation is applicable to many practical engineering problems. In [3], L. Ljung has outlined many of the challenges of nonlinear system identification as well as its particular importance for biological systems. In these types of problems, the model developed for analysis is typically a …
Psychophysical Similarity Based Feature Selection For Nodule Retrieval In Ct,
2011
University of Texas at El Paso
Psychophysical Similarity Based Feature Selection For Nodule Retrieval In Ct, Ravi K. Samala
Open Access Theses & Dissertations
The emerging paradigms in cancer research indicate the need for a multi-perspective and multi-modal screening approach for early lung cancer diagnosis to increase the probability of clinical resection. Currently no standalone screening methodology is proved to suffice for a clinical diagnosis. Computed tomography has been proved to present abnormality at an early stage with less impact on survival rate in population studies. Nevertheless, because of its non-invasive characteristic, it can be used for diagnosis, prognosis and visualization of tumor. Studies have shown that Computer aided diagnosis (CAD) as a second reader can perform in a similar capacity as a radiologist. …
Mixed-Signal Distributed Feature Extraction For Classification Of Wide-Band Acoustic Signals On Sensor Networks,
2011
University of Texas at El Paso
Mixed-Signal Distributed Feature Extraction For Classification Of Wide-Band Acoustic Signals On Sensor Networks, Humberto Santacruz
Open Access Theses & Dissertations
This thesis proposes a distributed/collaborative scheme for the classification of wide-band acoustic events within the context wireless sensor networks (WSNs). The proposed method is characterized by a mixed-signal processing scheme for the extraction of feature vectors which reduces the processing, memory allocation, and power requirements of the sensor nodes. The mixed-signal scheme assumes that nodes have an analog frontend consisting of a microphone, a bandpass filter, a squaring element and an integrator. This chain of components produces an estimate of the energy over the frequency subband extracted by the filter. The WSN has the ability to form a distributed filter …
