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2014

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Articles 961 - 990 of 1516

Full-Text Articles in Electrical and Computer Engineering

Target Detection And Cognitive Radio Capacity Analysis Based On Sensor Networks, Ishrat Maherin Jan 2014

Target Detection And Cognitive Radio Capacity Analysis Based On Sensor Networks, Ishrat Maherin

Electrical Engineering Dissertations - Archive

In this dissertation we studied two topics which are focused on target detection through foliage and capacity analysis of cognitive radio. We propose a multi-step information theory based scheme for target detection through foliage, using ultra wide-band (UWB) radar sensor network (RSN). This method is motivated by the fact that echoes from the stationary target, obscured by foliage, are more random than the region without the target. This is resolved by three steps of information fusion. Information fusion and integration is the process of combining data from several radar sensors and can achieve results that are not possible by individual …

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Identification Of The Interdependence Of Aging And Internal Pressure Evolution Of Commercial Li-Ion Cells, Anthony Matasso Jan 2014

Identification Of The Interdependence Of Aging And Internal Pressure Evolution Of Commercial Li-Ion Cells, Anthony Matasso

Electrical Engineering Dissertations - Archive

The demand for high power and energy coupled with long cycle life, low cost, and increased safety have become the driving factors in the development of lithium-ion batteries. This demand continues to expand with the sustained capability expansion of high power military applications, electric vehicles, grid-tie energy storage, and other renewable energy applications. Unlike the short innovation cycles that technologies like portable electronics experience, these applications are focused on an affordable long term product lifecycle that is safe. In order to achieve these long term goals, a better understanding of the chief degradation mechanisms as well as a more sophisticated …

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Some Considerations Of Performance And Capacity Of Voice Over Ip High Bit Rate Wireless Reverse Links, Richard Framjee Jan 2014

Some Considerations Of Performance And Capacity Of Voice Over Ip High Bit Rate Wireless Reverse Links, Richard Framjee

Electrical Engineering Dissertations - Archive

Evaluation of the performance and capacity of the wireless reverse links, that support concurrent voice over IP and packet data services, is important for spectral efficiency considerations. For a given traffic mix, this capacity is the maximum Erlangs and data throughput at a given packet error rate, voice packet expected wait time and probability of wait time outage. The voice packet wait times are traffic induced and due to retransmissions caused by high packet error rate. In this dissertation the error rate of high bit rate DS-SS BPSK RAKE receivers and traffic induced expected packet wait time for voice over …

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Molecular And Textural Surface Engineering For Biological Sensing, Mohammed Arif Iftakher Mahmood Jan 2014

Molecular And Textural Surface Engineering For Biological Sensing, Mohammed Arif Iftakher Mahmood

Electrical Engineering Dissertations - Archive

This research work was aimed at finding novel approaches for early cancer detection. In cancer diagnosis, the candidate molecules largely include free DNA, related proteins and tumor cells, listed in increasing order of size. The list is also commonly accepted as early precursor of the disease where DNA and proteins are available in patients' blood earlier and the cell starts to appear in relatively later stage. The ratio of these molecules to the background matter is extremely small. To make detection more difficult, these molecules, once dislodged from their primary location, get cleared fast. These factors call for extremely sensitive …

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Fast Intra Mode Decision In High Efficiency Video Coding, Harshdeep Brahmasury Jain Jan 2014

Fast Intra Mode Decision In High Efficiency Video Coding, Harshdeep Brahmasury Jain

Electrical Engineering Theses - Archive

In this thesis a CU early termination algorithm with a fast intra prediction algorithm is proposed that terminates complete full search prediction for the CU and replaced by CU early termination algorithm which determines the complexity of the CU block then on sent decision is made to further split or non-split the CU. This is followed by a PU mode decision to find the optimal modes prediction mode from 35 prediction modes. This includes a two-step process: firstly calculating the Sum of Absolute Differences (SAD) of all the modes by down sampling method and secondly applying a three step search …

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Encoder Complexity Reduction With Selective Motion Merge In Hevc, Abhishek Hassan Thungaraj Jan 2014

Encoder Complexity Reduction With Selective Motion Merge In Hevc, Abhishek Hassan Thungaraj

Electrical Engineering Theses - Archive

The High Efficiency Video Coding (HEVC) standard is the latest video coding project developed by the Joint Collaborative Team on Video Coding (JCT-VC) which involves the International Telecommunication Unit (ITU-T) Video Coding Experts Group (VCEG) and the ISO/IEC Moving Pictures Experts Group (MPEG) standardization organizations. The HEVC standard is based on the previous widely used H.264/AVC (Advance Video Coding) standard but includes many new tools and improvements in different key areas which has resulted in achieving a 50% bitrate reduction compared to its predecessor amidst maintaining the same visual quality at a cost of increased complexity.Among the different vital blocks …

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Quantized Nonnegative Matrix Factorization, Ruairí De Fréin Jan 2014

Quantized Nonnegative Matrix Factorization, Ruairí De Fréin

Conference papers

Even though Nonnegative Matrix Factorization (NMF) in its original form performs rank reduction and signal compaction implicitly, it does not explicitly consider storage or transmission constraints. We propose a Frobenius-norm Quantized Nonnegative Matrix Factorization algorithm that is 1) almost as precise as traditional NMF for decomposition ranks of interest (with in 1-4dB), 2) admits to practical encoding techniques by learning a factorization which is simpler than NMF’s (by a factor of 20-70) and 3) exhibits a complexity which is comparable with state-of-the-art NMF methods. These properties are achieved by considering the quantization residual via an outer quantization optimization step, in …

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Efficient Anonymous Biometric Matching In Privacy-Aware Environments, Ying Luo Jan 2014

Efficient Anonymous Biometric Matching In Privacy-Aware Environments, Ying Luo

Theses and Dissertations--Electrical and Computer Engineering

Video surveillance is an important tool used in security and environmental monitoring, however, the widespread deployment of surveillance cameras has raised serious privacy concerns. Many privacy-enhancing schemes have been recently proposed to automatically redact images of selected individuals in the surveillance video for protection. To identify these individuals for protection, the most reliable approach is to use biometric signals as they are immutable and highly discriminative. If misused, these characteristics of biometrics can seriously defeat the goal of privacy protection. In this dissertation, an Anonymous Biometric Access Control (ABAC) procedure is proposed based on biometric signals for privacy-aware video surveillance. …

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Modeling And Fault Detection In Dc Side Of Photovoltaic Arrays, Mohd Akram Jan 2014

Modeling And Fault Detection In Dc Side Of Photovoltaic Arrays, Mohd Akram

Electronic Theses and Dissertations

Fault detection in PV systems is a key factor in maintaining the integrity of any PV system. Faults in photovoltaic systems can cause irrevocable damages to the stability of the PV system and substantially decrease the power output generated from the array of PV modules. Among'st the various AC and DC faults in a PV system, the clearance of the AC side faults is achieved by conventional AC protection schemes,the DC side, however , there still exists certain faults which are difficult to detect and clear. This paper deals with the modeling, detection and classification of these types of DC …

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Visual Geo-Localization And Location-Aware Image Understanding, Amir Roshan Zamir Jan 2014

Visual Geo-Localization And Location-Aware Image Understanding, Amir Roshan Zamir

Electronic Theses and Dissertations

Geo-localization is the problem of discovering the location where an image or video was captured. Recently, large scale geo-localization methods which are devised for ground-level imagery and employ techniques similar to image matching have attracted much interest. In these methods, given a reference dataset composed of geo-tagged images, the problem is to estimate the geo-location of a query by finding its matching reference images. In this dissertation, we address three questions central to geo-spatial analysis of ground-level imagery: 1) How to geo-localize images and videos captured at unknown locations? 2) How to refine the geo-location of already geo-tagged data? 3) …

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Rf Energy Harvesting For Implantable Ics With On-Chip Antenna, Yu-Chun Liu Jan 2014

Rf Energy Harvesting For Implantable Ics With On-Chip Antenna, Yu-Chun Liu

Electronic Theses and Dissertations

Nowadays, as aging population increasing yearly, the health care technologies for elder people who commonly have high blood pressure or Glaucoma issues have attracted much attention. In order to care of those people, implantable integrated circuits (ICs) in human body are the direct solution to have 24/7 days monitoring with real-time data for diagnosis by patients themselves or doctors. However, due to the small size requirement for the implanted ICs located in human organs, it's quite challenging to integrate with transmitting and receiving antenna in a single chip, especially operating in 5.8-GHz ISM band. This research proposes a new idea …

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Integrated Microwave Resonator/Antenna Structures For Sensor And Filter Applications, Haitao Cheng Jan 2014

Integrated Microwave Resonator/Antenna Structures For Sensor And Filter Applications, Haitao Cheng

Electronic Theses and Dissertations

This dissertation presents design challenges and promising solutions for temperature and pressure sensors which are highly desirable for harsh-environment applications, such as turbine engines. To survive the harsh environment consisting of high temperatures above 1000°C, high pressures around 300 psi, and corrosive gases, the sensors are required to be robust both electrically and mechanically. In addition, wire connection of the sensors is a challenging packaging problem, which remains unresolved as of today. In this dissertation, robust ceramic sensors are demonstrated for both high temperature and pressure measurements. Also, the wireless sensors are achieved based on microwave resonators. Two types of …

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Identifying Influential Agents In Social Systems, Mahsa Maghami Jan 2014

Identifying Influential Agents In Social Systems, Mahsa Maghami

Electronic Theses and Dissertations

This dissertation addresses the problem of influence maximization in social networks. In- fluence maximization is applicable to many types of real-world problems, including modeling contagion, technology adoption, and viral marketing. Here we examine an advertisement domain in which the overarching goal is to find the influential nodes in a social network, based on the network structure and the interactions, as targets of advertisement. The assumption is that advertisement budget limits prevent us from sending the advertisement to everybody in the network. Therefore, a wise selection of the people can be beneficial in increasing the product adoption. To model these social …

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Investigation Of Dual-Stage High Efficiency And Density Micro Inverter For Solar Application, Lin Chen Jan 2014

Investigation Of Dual-Stage High Efficiency And Density Micro Inverter For Solar Application, Lin Chen

Electronic Theses and Dissertations

Module integrated converters (MIC), also called micro inverter, in single phase have witnessed recent market success due to unique features (1) improved energy harvest, (2) improved system efficiency, (3) lower installation costs, (4) plug-N-play operation, (5) and enhanced flexibility and modularity. The MIC sector has grown from a niche market to mainstream, especially in the United States. Due to the fact that two-stage architecture is commonly used for single phase MIC application. A DC-DC stage with maximum power point tracking to boost the output voltage of the Photovoltaic (PV) panel is employed in the first stage, DC-AC stage is used …

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Injection-Locked Vertical Cavity Surface Emitting Lasers (Vcsels) For Optical Arbitrary Waveform Generation, Sharad Bhooplapur Jan 2014

Injection-Locked Vertical Cavity Surface Emitting Lasers (Vcsels) For Optical Arbitrary Waveform Generation, Sharad Bhooplapur

Electronic Theses and Dissertations

Complex optical pulse shapes are typically generated from ultrashort laser pulses by manipulating the optical spectrum of the input pulses. This generates complex but periodic time-domain waveforms. Optical Arbitrary Waveform Generation (OAWG) builds on the techniques of ultrashort pulse-shaping, with the goal of making non-periodic, truly arbitrary optical waveforms. Some applications of OAWG are coherently controlling chemical reactions on a femtosecond time scale, improving the performance of LADAR systems, high-capacity optical telecommunications and ultra wideband signals processing. In this work, an array of Vertical Cavity Surface Emitting Lasers (VCSELs) are used as modulators, by injection-locking each VCSEL to an individual …

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Omnidirectional Microstrip Patch Antenna With Reconfigurable Pattern And Polarisation, Max Ammann, Xiulong Bao, Adam Narbudowicz Jan 2014

Omnidirectional Microstrip Patch Antenna With Reconfigurable Pattern And Polarisation, Max Ammann, Xiulong Bao, Adam Narbudowicz

Articles

An omnidirectional microstrip patch antenna, capable of reconfiguring both polarisation and radiation pattern is proposed. It operates with two orthogonal ±45° slanted linear polarisations and can produce two dipole-like radiation patterns, providing 360° coverage in either the horizontal or elevation plane. With appropriate steering, this enables a single antenna to provide full spherical coverage for any polarisation. The reconfiguration is realised by phase shifting, thus does not require switching elements, such as MEMS or pin diodes embedded into antenna. The basic principles of operation are discussed and validated by numerical and measured data.

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Potential Ignition Sources From Residential Electric Cooktops, Corey Ray Hanks Jan 2014

Potential Ignition Sources From Residential Electric Cooktops, Corey Ray Hanks

Online Theses and Dissertations

A study was conducted to evaluate the competency of several types of electric cooktop ranges igniting a variety of common kitchen items. Four types of electric cooktop ranges were tested including a ceramic-glass cooktop range, an electric coil cooktop range, an electric coil cooktop range with cast iron plate installed, and an electric coil cooktop range with a temperature-limiting control sensor. The latest research was reviewed to select a representative sample of fuels commonly noted as the first fuel ignited in kitchen fires. The nine selected fuels included cardboard (pizza box), a cotton dish towel, a roll of paper towels, …

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Voltage Smoothing With A Capacitor, Martin Copello Jan 2014

Voltage Smoothing With A Capacitor, Martin Copello

Undergraduate Journal of Mathematical Modeling: One + Two

A rectifier is an electrical circuit that converts alternating current to direct current, e.g., a half wave rectifier removes lower valleys of the AC voltage wave. If a capacitor is placed in parallel with a half wave rectifier, the transition from voltage peak to peak is smoothed to closer resemble constant DC voltage. The objective of this project was to model the voltage changes of a half wave rectifier with a parallel capacitor. It was found that the smoothness of the voltage waves increased as the capacitance of the capacitor increased.

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Computer Vision Aided Bridge Monitoring System, Sushruth Mune Gowda Jan 2014

Computer Vision Aided Bridge Monitoring System, Sushruth Mune Gowda

Electrical Engineering Theses - Archive

Supervising Professor: Roger Walker With bridges representing a significant part of the road network in the United States, continual monitoring and early detection of deterioration in these structures is vital to prevent expensive repairs or catastrophic failures. Advances in sensing and information technologies help in monitoring and evaluating the health of a bridge. Currently, all the bridge monitoring systems are static in nature. With the help of TxDOTs Pavement Management Information System (PMIS) survey, the proposed mobile Bridge Monitoring System will periodically monitor these structural changes and help the maintanance management decision making process. The mobile Bridge Monitoring System has …

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The Study Of The Effect Of Smart Meter Rf Transmissions On Ground Fault Circuit Interrupters, Simon Donahue Jan 2014

The Study Of The Effect Of Smart Meter Rf Transmissions On Ground Fault Circuit Interrupters, Simon Donahue

Electrical Engineering Theses - Archive

Research and development is currently being performed to transform the United States' utility electric grid into a `Smart Grid' with the purpose of more efficiently distributing power, giving more control over the grid itself, and creating the potential savings for consumers. Smart Meters are among the first intelligent metering devices used within the `Smart Grid' concept, allowing consumers to effectively track their power usage within their home. They have thus far been deployed in thousands of commercial and residential electrical installations around the US. While the wide scale deployment of these devices has initially proven very successful, there is still …

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Modeling The Capillary Discharge Of An Electrothermal (Et) Launcher, Travis Least Jan 2014

Modeling The Capillary Discharge Of An Electrothermal (Et) Launcher, Travis Least

Electrical Engineering Theses - Archive

Over the past few decades, different branches of the US Department of Defense (DoD) have invested at improving the field ability of electromagnetic launchers. One such focus has been on achieving hypervelocity launch velocities in excess of 7 km/s for direct launch to space applications [1]. It has been shown that pre-injection is required for this to be achieved. One method of pre-injection which has promise involves using an electro-thermal (ET) due to its ability to achieve the desired velocities with a minimal amount of hot plasma injected into the launcher behind the projectile. Despite the demonstration of pre-injection using …

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A Literature Review On Neuro-Cognitive Learning And Control, Patanjalikumar Shashankkumar Joshi Jan 2014

A Literature Review On Neuro-Cognitive Learning And Control, Patanjalikumar Shashankkumar Joshi

Electrical Engineering Theses - Archive

This thesis is an effort to provide a foundation work linking neuroscience, psychology and control theory as a part of research going on developing fast satisficing autonomous systems at the University of Texas at Arlington Research Institute (UTARI). This literature review, the compilation is aimed to facilitate information and references needed for neurocognition and control. There is so much research going on to understand the neural mechanisms of a mammal brain, especially human brain. Although it is not fully understood, there are proposed and proven theories that address intelligence, various learning and decision making processes performed by various parts of …

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Flexible Mems Sensors And Pyroelectric Thin Films, Moinuddin Ahmed Jan 2014

Flexible Mems Sensors And Pyroelectric Thin Films, Moinuddin Ahmed

Electrical Engineering Dissertations - Archive

MEMS sensors on flexible substrates were developed and fabricated utilizing conventional lithography, deposition and etching tools. All of these sensors were fabricated in a MESA structure on the flexible substrates for tactile sensing, robotic, and biomedical applications. In addition, a new processing technique was developed to release the flexible substrate more easily from the rigid silicon carrier wafer to increase fabrication yield. Temperature sensors were fabricated on flexible substrates; utilizing amorphous silicon as the sensing material. After releasing from the rigid silicon carrier wafer, the sensors were packaged and characterized for their I-V, thermal response and 1/f noise properties. The …

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A New Feature Descriptor For Lidarstrip Matching, Mythreya Jayendra Lakshman Jan 2014

A New Feature Descriptor For Lidarstrip Matching, Mythreya Jayendra Lakshman

Electrical Engineering Dissertations - Archive

Light Detection and Ranging (LiDAR) data has been getting a lot of attention these days because of its applicability in various fields - city planning, disaster response & precaution, soil conservation, infrastructure or forestry. Raw LiDAR data is not directly usable in the above-mentioned applications. Therefore, an important aspect of the aerial LIDAR system is to process raw LiDAR data accurately. The processed data is then made available to us in the form of point clouds or digital elevation maps (DEM's) or digital surface maps (DSM's). Each swath of raw data represents a single flight path over a region of …

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Design, Fabrication And Characterization Of Guided-Mode Resonance Transmission Filters, Mohammad Shyiq Amin Jan 2014

Design, Fabrication And Characterization Of Guided-Mode Resonance Transmission Filters, Mohammad Shyiq Amin

Electrical Engineering Dissertations - Archive

This dissertation addresses photonic devices enabled by the guided-mode resonance (GMR) effect. As periodic phototonic structures can become highly reflective or transmissive at resonance, this effect has been utilized to design suites of optical elements including reflection filters, transmission filters, broadband mirrors, polarizers, and absorbers with a plethora of possible deployment venues. Even though there has been considerable research on the reflection type GMR elements, attendant transmission filters have less explored experimentally, as there is material limitation to design this kind of filters with simple architecture and they also may require coupling to multiple resonances simultaneously. Apart from the design …

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Guided-Mode Resonant Solar Cells And Flat-Top Reflectors: Analysis, Design, Fabrication And Characterization, Tanzina Khaleque Jan 2014

Guided-Mode Resonant Solar Cells And Flat-Top Reflectors: Analysis, Design, Fabrication And Characterization, Tanzina Khaleque

Electrical Engineering Dissertations - Archive

This dissertation addresses the guided-mode resonance (GMR) effect and its applications. In particular, this study presents theoretical analysis and corresponding experiments on two important GMR devices that can be broadly described as GMR-enabled thin-film solar cells and flat-top reflectors.The GMR-induced enhanced absorption of input light is observed and quantified in a fabricated nano-patterned amorphous silicon (a-Si) thin-film. Compared to a reference homogeneous thin-film of a-Si, approximately 50% integrated absorbance enhancement is achieved in the patterned structure. This result motivates the application of these resonance effects in thin-film solar cells where enhanced solar absorbance is a crucial requirement. Light trapping in …

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Towards Perfect Light Coupling And Absorption In Nanomembranes With Omni-Directional Anti-Refelction And Photonic Crystal Structures, Arvinder Chadha Jan 2014

Towards Perfect Light Coupling And Absorption In Nanomembranes With Omni-Directional Anti-Refelction And Photonic Crystal Structures, Arvinder Chadha

Electrical Engineering Dissertations - Archive

Silicon photonics is realized as a promising platform to meet the requirements of higher bandwidth and low cost high density monolithic integration. More recent demonstrations of a variety of stretchable, foldable and transfer printed ultra-thin silicon integrated circuits have instigated the use of flexible silicon nanomembrane for practical applications. Equally impressive innovations are demonstrated in the area of flat screen displays, smart cards, eyeglasses, and wearable displays. However, the overall efficiency of a variety of optical device is limited by poor light management resulting from difficulty of light coupling, small absorption volume in thin-film nanomembrane, and glare at oblique incidence …

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Hybrid And Smart Grid Wireless Networks: Capacity And Optimization, Xin Wang Jan 2014

Hybrid And Smart Grid Wireless Networks: Capacity And Optimization, Xin Wang

Electrical Engineering Dissertations - Archive

Hybrid wireless network is a combination of ad hoc network and cellular network. A key question arising in such hybrid wireless networks is what is the per-node data transmission limit of the hybrid wireless network over general fading channels and how the throughput capacity varies with different network setup. To our best knowledge, our research is the first piece of work in literature to take up this challenge. To achieve the maximum per-node throughput, an opportunistic communication strategy together with successive interference cancelation (SIC) technique is proposed in this dissertation. The scaling laws for the throughput capacity over both slow …

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Distributed Cooperative Control Of Ac Microgrids, Ali Bidram Jan 2014

Distributed Cooperative Control Of Ac Microgrids, Ali Bidram

Electrical Engineering Dissertations - Archive

In this dissertation, the comprehensive secondary control of electric power microgrids is of concern. Microgrid technical challenges are mainly realized through the hierarchical control structure, including primary, secondary, and tertiary control levels. Primary control level is locally implemented at each distributed generator (DG), while the secondary and tertiary control levels are conventionally implemented through a centralized control structure. The centralized structure requires a central controller which increases the reliability concerns by posing the single point of failure. In this dissertation, the distributed control structure using the distributed cooperative control of multi-agent systems is exploited to increase the secondary control reliability. …

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Using Advanced Metering Infrastructure Data For Smart Grid Development, Franklin L. Quilumba-Gudino Jan 2014

Using Advanced Metering Infrastructure Data For Smart Grid Development, Franklin L. Quilumba-Gudino

Electrical Engineering Dissertations - Archive

Identifying and using Advanced Metering Infrastructure (AMI) data to improve customer experience, utility operations, and advanced power management is one of the most important challenges in the smart grid development. Smart meters, capable of capturing frequent interval customer consumption (and possibly other parameters) using communication networks, are vital components of smart grid technology. Thus, smart meters expand the available range of data and functionality. Making the most of information from smart meters and smart grids increasingly requires dealing with Big Data. Big Data is a game changer, enabling utilities to transform the ways they interact with and serve their customers.Today, …

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