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Articles 1 - 30 of 34
Full-Text Articles in Engineering
Modeling And Characterization Of Power Distribution Networks With Installed Distributed Generation And Connected Phevs, Santhosh Basineni
Modeling And Characterization Of Power Distribution Networks With Installed Distributed Generation And Connected Phevs, Santhosh Basineni
Electrical Engineering Theses
This thesis is focused on the modeling and characterization of power distribution networks with installed distributed generation and connected plug-in hybrid electric vehicles (PHEV). A PHEV charging/discharging (bidirectional) model has been developed in MATLAB®-Simulink. Installed photovoltaic systems with varying irradiance rates are modeled and characterized. Moreover, installed wind generators with varying wind speeds are modeled and characterized. Furthermore, the charging and discharging characteristics of connected PHEV are determined. The system characteristics are determined and investigated against the PHEV battery state of charge (SOC).
Modeling, Control And Characterization Of Aircraft Electric Power Systems, Hadi Ebrahimi
Modeling, Control And Characterization Of Aircraft Electric Power Systems, Hadi Ebrahimi
Electrical Engineering Theses
A study model of advanced aircraft electric power system (AAEPS) corresponding to B767 Aircraft is developed in the PSIM9 software environment. The performance characteristics of the system under consideration for large sharing of non-linear loads are studied. A comprehensive mathematical model describing system dynamics is derived where the GSSA technique is applied for reduced-order system approximation. The transient and steady-state performance of the hybrid PEM-FC/battery APU integrated to the aircraft electric network is analyzed while different loading scenarios are taken into account. In addition, dynamic bifurcation analysis is employed to characterize the systems stability performance under multi-parameters condition. Also, the …
Four-Coil Wireless Power Transfer Using Resonant Inductive Coupling, Sravan Annam
Four-Coil Wireless Power Transfer Using Resonant Inductive Coupling, Sravan Annam
Electrical Engineering Theses
With the developments of mobile and implantable devices, wireless power transfer (WPT) has become increasingly attractive to free a variety of electronic systems from power cords and batteries. Resonant inductive coupling is the leading technology of WPT, offering high efficiencies (>75%) with power levels from microwatts to hundreds of watts. This thesis focuses on a resonant four-coil inductive WPT technology. It develops numerical models of the four-coil WPT system (incorporated into a Matlab simulator) and validates them by experiment. It then develops numerical tools using Matlab for computing self- and mutual inductances for inductors of arbitrary shape and orientations …
Optimization Of Short-Channel Rf Cmos Low Noise Amplifiers By Geometric Programming, Xiaoyu Jin
Optimization Of Short-Channel Rf Cmos Low Noise Amplifiers By Geometric Programming, Xiaoyu Jin
Electrical Engineering Theses
Geometric programming (GP) is an optimization method to produce globally optimal circuit parameters with high computational efficiency. Such a method has been applied to short-channel (90 nm and 180 nm) CMOS Low Noise Amplifiers (LNAs) with common-source inductive degeneration to obtain optimal design parameters by minimizing the noise figure. An extensive survey of analytical models and experimental results reported in the literature was carried out to quantify the issue of excessive thermal noise for short-channel MOSFETs. Geometric programming compatible functions have been determined to calculate the noise figure of short-channel CMOS devices by taking into consideration channel-length modulation and velocity …
Investigation Of The Electronic Properties Of The Memristor Using One Dimensional Drift Models, Swetha Gazabare
Investigation Of The Electronic Properties Of The Memristor Using One Dimensional Drift Models, Swetha Gazabare
Electrical Engineering Theses
The memristor was proposed over forty years ago by Leon Chua as the missing 4th two-terminal nonlinear circuit element. Recently Hewlett-Packard (HP) announced the first fabrication of a device following memristor circuit rules. HP's device is a cross-bar resistive hysteretic switch designed for nonvolatile high density memory applications. In this thesis well-known one-dimensional drift models, which assume sinusoidal voltage sources, were used to predict level of frequency sensitivity in hysteresis curves and instantaneous power curves for memristors. Drift model simulation tests, with ac voltage sources, indicate that the memristor frequency response scales inversely with an identified time constant predicted from …
A Compressive Radar System With Chaos Based Fm Signals Generated Using The Bernoulli Map, Charan Teja Enugula
A Compressive Radar System With Chaos Based Fm Signals Generated Using The Bernoulli Map, Charan Teja Enugula
Electrical Engineering Theses
Matched filters are used in radar systems to identify echo signals embedded in noise. By using matched filters, range and Doppler information about the target can be extracted from the reflected signal. The use of matched filters in high frequency radars has the effect of increasing the cost and complexity of these systems. For that reason, the radar research community is looking at a new technique called compressive sensing or compressive sampling. This technique works by exploiting signal sparsity and has the potential to eliminate the use of matched filters and high frequency analog-to-digital converters. In this research, it is …
Power Quality And Voltage Stability Of Power Systems With A Large Share Of Distributed Energy Resources, Yuva Nandan Reddy Chejerla
Power Quality And Voltage Stability Of Power Systems With A Large Share Of Distributed Energy Resources, Yuva Nandan Reddy Chejerla
Electrical Engineering Theses
The main objective of this research is to model and characterize power systems with a large share of distributed energy resources. The effect of integrating distributed energy resources such as wind farms, photovoltaic arrays, fuel cell stacks and micro-hydroelectric generators on the power quality and voltage stability of power systems is investigated and characterized. A comprehensive power system model was developed in Matlab/Simulink environment. Stand-alone and grid-connected models of distributed energy resources were developed and integrated into the system under investigation. Several characteristics such bus voltage profiles, voltage transients, power flow, and total harmonic distortion are captured and investigated. The …
Modeling Polarization And Capacitance Hysteresis Of Ferroelectric Capacitors, Bikash Shrestha
Modeling Polarization And Capacitance Hysteresis Of Ferroelectric Capacitors, Bikash Shrestha
Electrical Engineering Theses
A simulation based comparative study of the polarization hysteresis of the ferroelectric capacitor using various ferroelectric models is presented. A 2-dimensional finite element device-level model was implemented using SILVACO's ATLAS device simulator to generate the polarization hysteresis characteristics for Au/Poly(vinylidene fluoride-trifluoroethylene)/Au metal-insulator-metal (MIM) device. Landau free energy expression for electric field in terms of polarization is also implemented in MATLAB to produce the polarization hysteresis curves of monocrystalline and polycrystalline ferroelectrics. The main drawback of previous models was their inability to predict polarization saturation at the same electric field limits as compared with measurements taken from a recently fabricated ferroelectric …
A Comparative Analysis Of Feature Extraction Techniques For Eeg Signals From Alzheimer Patients, Ramya Priya Mudhiganti
A Comparative Analysis Of Feature Extraction Techniques For Eeg Signals From Alzheimer Patients, Ramya Priya Mudhiganti
Electrical Engineering Theses
This research deals with the study of Alzheimer Disease (AD). Electroencephalogram (EEG) signal is a clinical tool for the diagnosis and detection of AD. EEG signals are analyzed for the diagnosis of AD applying several linear and non-linear methods of signal processing. This work studies and implements several measures of EEG signal complexity and then compares the complexity features measured or extracted from EEG signals. Time domain analysis of EEG signals is performed using several signal processing techniques such as higher order moments, entropies and fractal dimension calculation using fractal analysis. Frequency domain analysis of EEG signals is performed using …
Design And Implementation Of Fault Tolerant Adders On Field Programmable Gate Arrays, Lakshmi Phani Deepthi Bollepalli
Design And Implementation Of Fault Tolerant Adders On Field Programmable Gate Arrays, Lakshmi Phani Deepthi Bollepalli
Electrical Engineering Theses
Fault tolerance on various adder architectures implemented on Field Programmable Gate Arrays (FPGAs) is studied in this thesis. This involves developing error detection and correction techniques for the sparse Kogge-Stone adder and comparing it with Triple Modular Redundancy (TMR) techniques. Fault tolerance is implemented on a Kogge-Stone adder by taking advantage of the inherent redundancy in the carry tree. On a sparse Kogge-Stone adder, fault tolerance is realized by introducing additional ripple carry adders into the design. The implementation of this fault tolerance approach on the sparse Kogge-Stone adder is successfully completed and verified by introducing faults either on the …
A Real-Time Embedded Fpga Interface For An Ethernet Based Line Laser, Subrahmanya Ramaswamy
A Real-Time Embedded Fpga Interface For An Ethernet Based Line Laser, Subrahmanya Ramaswamy
Electrical Engineering Theses
Profile measurement systems developed at the Transportation Instrumentation and Embedded systems Lab (TIL) at the University of Texas at Arlington are used by Texas Department of Transportation (TxDOT) to compute the profile of the road. The systems use certain basic sensors such as a laser, start sensor, distance encoder and accelerometer. The data samples from these sensors are acquired and stored for further processing. The data is processed in real-time using a road profiling algorithm to calculate the profile. This research effort investigates the feasibility of implementing the existing system using FPGA components and specifically for interfacing the laser to …
Modeling And Identification Of Thermally Actuated Micro-Robots, Sai Kalyan Yelike
Modeling And Identification Of Thermally Actuated Micro-Robots, Sai Kalyan Yelike
Electrical Engineering Theses
This thesis explains the system identification of thermally actuated micro-robots and actuators developed at UTA-NGS (Next Generation Systems) and ARRI (Automation Robotics Research Institute). The energy used to power these actuators are externally-supplied voltage and class IV Laser sources. The micro-robots actuated with class IV laser sources have displacements recorded through a camera. Applied laser input waveforms and micro-robot's positional displacement are used for system identification of the Micro-robot. Various system identification methods (non-recursive and recursive) are used for creating a mathematical model of the physical system (Micro-robot). A similar approach is followed for micro-actuators known as chevron actuators powered …
Infrared Imaging Method For Thermographic Characterizing Of Medical High Intensity Focused Ultrasound Devices, Mohammadreza Jahangir Moghadam
Infrared Imaging Method For Thermographic Characterizing Of Medical High Intensity Focused Ultrasound Devices, Mohammadreza Jahangir Moghadam
Electrical Engineering Theses
With new improvements in high-end commercial R&D Infrared camera technologies many challenges have been overcome for exploring high speed Infrared imaging, the ability to capture fast varying phenomena without image blur, acquire enough data to properly characterize dynamic energy, and increase the dynamic range without compromising the number of frames per second. This study presents a noninvasive method for determining the spatial and thermal heating profiles in a phantom tissue generated by High Intensity Focused Ultrasound (HIFU) beam by using Infrared imaging. A high speed Infrared camera was placed above a tissue mimicking material that was heated at the focal …
Circuit Pools: Preventive Information Leak Attacks In Salsa Through Cached Lookups, Anahita Davoudi
Circuit Pools: Preventive Information Leak Attacks In Salsa Through Cached Lookups, Anahita Davoudi
Electrical Engineering Theses
An improvement in preventing information leak attacks has been proposed by enhancing the path building process using pair of nodes obtained from lookups done by each initiator randomly. Using a pool of pairs locally produced for each initiator by random lookups done by that node; improves anonymity for the circuit initiator. The percentages of how many pools each pair belongs to, availability of each pair, and number of circuit attempts are analyzed for different number of both pool size and redundancy level. With these modifications and additions, the performance of the system has improved against the Conventional Continuous Stage Attack, …
Super-Resolution With Better Edge Enhancement, Gaurav Hansda
Super-Resolution With Better Edge Enhancement, Gaurav Hansda
Electrical Engineering Theses
Super resolution image reconstruction is a promising technique of digital imaging which attempts to generate a raster image with a higher resolution than its source. The source can consist of one or more images or frames. This thesis focuses on single-frame super-resolution i.e. the source is a single raster image. Changing the resolution directly refers to resampling the image. Specific algorithms have been designed for scaling up, scaling down and rotating images that deliver high quality results. Process of scaling up or super-resolution is the primary focus of this thesis, which in contrast scaling down or rotating deals with the …
Complexity Reduction Of H.264 Using Parallel Programming, Sudeep Prakash Gangavati
Complexity Reduction Of H.264 Using Parallel Programming, Sudeep Prakash Gangavati
Electrical Engineering Theses
The H.264 encoder provides for adaptive directional intra-prediction, motion-compensated inter-prediction followed by transform, quantization, deblocking filtering and either variable length encoding or arithmetic coding. All these blocks of the H.264 encoder make it highly complex as compared to previous video coding standards. There is a need for measures to reduce the complexity. This thesis aims at reducing the complexity of the .H.264 encoder by reducing the encoding time of the H.264 standard while not sacrificing the video quality, compression efficiency and bitrate by parallel programming. There are several parallel programming models that can be used. The massively parallel Graphics Processing …
Optimizing A Neural Network Over Size And Iteration Number, Jignesh K. Patel
Optimizing A Neural Network Over Size And Iteration Number, Jignesh K. Patel
Electrical Engineering Theses
A unique algorithm has been developed for training multilayer perceptron neural networks. First the training algorithm has been used with hidden weight optimization (HWO) and multiple optimal learning factors (MOLF) to get the best performance. In each training iteration, this method first optimally orders the inputs and then optimally orders the hidden basis functions. At the end of each training iteration, the method calculates the validation error versus number of basis function curve in one pass through the validation data. Since, pruning is done at each iteration, we optimize validation error over number of basis functions and number of iterations …
Characterization Of Sub-10 Nm Pores In Silicon-Dioxide, Joseph A. Billo
Characterization Of Sub-10 Nm Pores In Silicon-Dioxide, Joseph A. Billo
Electrical Engineering Theses
Biomarkers have become an integral part of oil exploration. Gas Chromatography (-Mass Spectrometry) is performed to an oil sample to acquire biomarkers from the sample. The presence, lack of, or abundance of a given compound (or biomarker) in the geochemical results of an oil sample depict(s) a property or properties of the source rock and the oil. For example, the abundance of pristane and lack of phytane in an oil sample are characteristic of a shale source rock, such as the Eagle Ford, will show a high pristane to phytane ratio. The Eagle Ford shale formation is cretaceous in age; …
Analytical Evaluation Of Frequency Reuse For Ofdma Cellular Networks, Anis Davoudi
Analytical Evaluation Of Frequency Reuse For Ofdma Cellular Networks, Anis Davoudi
Electrical Engineering Theses
In this thesis, the goal is to arrive at tractable general expressions for probability of coverage and achievable rate for a typical mobile user. For this purpose, the grid network model is replaced with the Poisson Point Process model. Later, the scenario has been made narrower and then, it is assumed that the power of the interference signals has exponential distribution, which has helped to greatly simplify the formulas. Then, to evaluate the effect of frequency reuse on the probability of coverage and the average achievable rate in the new model, these results have been simulated. Frequency reuse had a …
Implementation Of Fast Inter-Prediction Mode Decision In H.264/Avc Video Encoder, Amruta Kiran Kulkarni
Implementation Of Fast Inter-Prediction Mode Decision In H.264/Avc Video Encoder, Amruta Kiran Kulkarni
Electrical Engineering Theses
H.264/MPEG-4 Part 10 or AVC (advanced video coding) is currently one of the most widely used industry standards for video compression. There are several video codec solutions, both software and hardware, available in the market for H.264. This video compression technology is primarily used in applications such as video conferencing, mobile TV, blu-ray discs, digital television and internet video streaming. This thesis uses the JM 17.2 reference software [15], which is available for all users and can be downloaded from http://iphome.hhi.de/suehring/tml. The software is mainly used for educational purposes; it also includes the reference software manual which has information about …
Performance Analysis And Implementation Of Mode Dependent Dct/Dst In H.264/Avc, Priyadarshini Anjanappa
Performance Analysis And Implementation Of Mode Dependent Dct/Dst In H.264/Avc, Priyadarshini Anjanappa
Electrical Engineering Theses
Video communications require significant amounts of information transmission. Video compression involves the bitrate reduction of a digital video signal carrying visual information. Compression can be a lossless or a lossy operation. Because of the immense volume of video information, lossy operations are mainly used for video compression. H.264 is a video compression standard that defines a wide set of coding tools to achieve compression. Transform coding is a lossy compression technique that exploits statistical dependencies between image pixels by converting them into coefficients with little or no dependencies. Block transform coding is widely used in image and video compression systems, …
Design And Printed Circuit Board Level Implementation Of A Narrow Band Lc Vco, Anjan Govindaraju
Design And Printed Circuit Board Level Implementation Of A Narrow Band Lc Vco, Anjan Govindaraju
Electrical Engineering Theses
A Voltage Controlled Oscillator (VCO) using a 0.6 µm CMOS technology has been designed and fabricated. The design's tuning range is from 390 MHz to 410 MHz, with the center frequency being 400 MHz. The oscillator is powered by a 2.5 volt power supply. The controlling voltage varies from 0.87 to 1.6 volts. Simulation of the LC VCO was carried out in the Advanced Design System (ADS) program. For the printed circuit board level implementation, the layout was first performed using the ADS program, and then its image was transferred on to a printed circuit board. The device footprints were …
Time Invariant Modeling Of Higher Order Dc-Dc Converters, Lei Niu
Time Invariant Modeling Of Higher Order Dc-Dc Converters, Lei Niu
Electrical Engineering Theses
A time invariant modeling technique is proposed for higher order dc-dc converters, including Cuk, SEPIC, and Zeta converters. This thesis also investigates some issues involved in applying existing averaging techniques such as circuit averaging, state space averaging, generalized state space averaging, Krylov-Bogoliubov-Mitropolsky method, and Floquet theory, to model the dynamic behaviors of higher order converters. The proposed methodology is shown to provide better accuracy compared to existing techniques, and distinguishes between different types of carrier signals of modulation, for instance, sawtooth and isosceles triangle carrier signal. This thesis offers a straightforward systematic procedure and summarizes this procedure with a list …
Silicon Defect Recognition, Aditi S. Godbole
Silicon Defect Recognition, Aditi S. Godbole
Electrical Engineering Theses
An algorithm is presented for the recognition of four types of defects present in silicon wafer images. Defect recognition is achieved by following a 3-step process: segmentation, feature extraction and classification.Multiple image segmentation algorithms are tried for locating and isolating the defects present in the silicon wafer images. The proposed image segmentation technique is based on simple concept of threshold based segmentation and edge detection based segmentation. Combination of four segmentation algorithms based on above mentioned techniques are used such that each segmentation algorithm specializes in segmenting a certain type of defect, thereby ensuring high chances of correct segmentation. Out …
Design, Microfabrication And Characterization Of A Microheater Platform For Studying Dna-Surface Interactions, Annas Javed
Design, Microfabrication And Characterization Of A Microheater Platform For Studying Dna-Surface Interactions, Annas Javed
Electrical Engineering Theses
The past few decades have witnessed significant research towards developing DNA biosensors and gene chips. These devices obtain sequence-specific DNA information in a faster, simpler and cheaper manner compared to traditional hybridization assays. Miniaturization of DNA handling and processing devices has contributed significantly towards this effort. Despite the large amount of work in this research direction, much more needs to be understood about the fundamental interactions of DNA and other biological macromolecules with their microenvironment, particularly with inorganic surfaces. For example, a basic understanding of thermal interactions of DNA with surfaces may help develop novel strategies for probing, purifying and …
Implementation And Analysis Of Directional Discrete Cosine Transform In H.264 For Baseline Profile, Shreyanka Subbarayappa
Implementation And Analysis Of Directional Discrete Cosine Transform In H.264 For Baseline Profile, Shreyanka Subbarayappa
Electrical Engineering Theses
H.264/AVC [1] is a video coding standard that has a wide range of applications ranging from high-end professional camera and editing systems to low-end mobile applications. They strive to achieve maximum compression efficiency without compromising the quality of video. To this end many coding tools are defined in the coder. Transform coding is one among them. Transform Coding represents the signal/image (that is currently in time/spatial domain) in another domain (transform domain), where most of the energy of the signal/image is concentrated in a fewer number of coefficients. Thus the insignificant coefficients can be discarded after transform coding to achieve …
Investigation Of Spectral Properties Of A Dfb Laser Source, Gokul Krishna Srinivasan
Investigation Of Spectral Properties Of A Dfb Laser Source, Gokul Krishna Srinivasan
Electrical Engineering Theses
We determine the linewidth characteristic of a DFB laser source by conducting experiments employing a coherent detection setup. We use an instrument grade external semiconductor laser device as the local oscillator and the DFB laser as the signal. We analyze the photocurrent using real-time oscilloscope and RF spectrum analyzer. We compute the auto-correlation and the power spectral density of the photocurrent. We model the natural width of the DFB and compare the simulated plot with the experiment data. We determine the intrinsic linewidth of the DFB laser source with this plot. We design a LabView program to record the beat …
Characterization Of Flexible Antennas For Wirelessly Powering Medical Implants, Safwan Ahmed Muneer
Characterization Of Flexible Antennas For Wirelessly Powering Medical Implants, Safwan Ahmed Muneer
Electrical Engineering Theses
To minimize the trouble experienced by the patient in undergoing invasive surgeries to replace non rechargeable batteries that are used to power body implants inside, medical experts and engineers are emphasizing on making use of wireless power. Since body implant powering from external wireless power requires a source that can be easily worn outside the body, a special type of integrated antenna was implemented on a flexible substrate that conforms to the shape of the stomach curvature, thus adding increased patient comfort. The antenna bend is concave which adds to increased focus and increases power transfer efficiency to power the …
Complexity Reduction In H.264 Encoder Using Open Multiprocessing, Tejas Pravin Sathe
Complexity Reduction In H.264 Encoder Using Open Multiprocessing, Tejas Pravin Sathe
Electrical Engineering Theses
H.264 video standard developed by Joint Video Team has proven dramatic improvements in bit-rate efficiency, compression ratio, video quality and error resilience. But, all this is achieved at the expense of more than four times of the computational complexity due to various new features including quarter-pixel motion estimation with variable block sizes and multiple reference frames, adaptive directional intra-prediction, integer transformation based on discrete cosine transform, alternative entropy coding mode Context-based Adaptive Variable Length Coding (CAVLC) or Context-Based Adaptive Binary Arithmetic Coding (CABAC), in loop de-blocking filter etc. This thesis aims at reducing the encoding time for the video sequence …
Accelerated Simulation Of Supercapacitors Using Order Reduction Techniques And Waveform Relaxation Methods, Fatih Cingoz
Accelerated Simulation Of Supercapacitors Using Order Reduction Techniques And Waveform Relaxation Methods, Fatih Cingoz
Electrical Engineering Theses
Supercapacitors are promising energy storage devices due to their capability to deliver high peak current and to capture a huge amount of energy in a short time with very low internal power loss. They are candidate component to be used in as a secondary energy storage device in hybrid electric vehicles (HEV)). Precise model development and accelerated simulation environments are needed to minimize the design time (and subsequently the product-to-market time) and minimize the hardware redesign and retrofit. Transmission line and RC parallel-branch equivalent models show relatively higher accuracy in predicting the dynamic behavior of the device. They also have …