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Articles 2581 - 2610 of 5738

Full-Text Articles in Electrical and Electronics

Study Of Millisecond Laser Annealing On Ion Implanted Soi And Application To Scaled Finfet Technology, Tyler J. Michalak Jan 2015

Study Of Millisecond Laser Annealing On Ion Implanted Soi And Application To Scaled Finfet Technology, Tyler J. Michalak

Legacy Theses & Dissertations (2009 - 2024)

The fabrication of metal-oxide-semiconductor field effect transistors (MOSFET) requires the engineering of low resistance, low leakage, and extremely precise p-n junctions. The introduction of finFET technology has introduced new challenges for traditional ion implantation and annealing techniques in junction design as the fin widths continue to decrease for improved short channel control. This work investigates the use of millisecond scanning laser annealing in the formation of n-type source/drain junctions in next generation MOSFET.

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Implementation Of Strategies To Improve The Reliability Of Iii-Nitride Photodetectors Towards The Realization Of Visible And Solar-Blind Imaging Arrays, John Bulmer Jan 2015

Implementation Of Strategies To Improve The Reliability Of Iii-Nitride Photodetectors Towards The Realization Of Visible And Solar-Blind Imaging Arrays, John Bulmer

Legacy Theses & Dissertations (2009 - 2024)

Ultraviolet (UV) radiation detectors are being heavily researched for applications in non-line-of-sight (NLOS) communication systems, flame monitoring, biological detection, and astronomical studies. These applications are currently being met by the use of Si-based photomultiplier tubes (PMTs), which are bulky, fragile, expensive and require the use of external filters to achieve true visible-blind and solar-blind operation.

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High Frequency Signal Transmission In Through Silicon Via Based 3d Integrated Circuit, Min Xu Jan 2015

High Frequency Signal Transmission In Through Silicon Via Based 3d Integrated Circuit, Min Xu

Legacy Theses & Dissertations (2009 - 2024)

Through silicon vias (TSVs) enable 3-dimensional (3D) integrated circuits (ICs), which have the potential to reduce the power consumption, interconnect length and overall communication latency in modern nanoelectronics systems. High-speed signal transmission channels through stacked silicon substrates are critical for 3D heterogeneous integration. This work presents systematic analyses of fabricated 3D IC test structures. This includes test structure design, fabrication, experimental characterization, equivalent circuit modeling and full wave simulations for high-speed signal transmission of the TSV based 3D IC channels.

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Carbon 1d/2d Nanoelectronics : Integration And Device Applications, Zhaoying Hu Jan 2015

Carbon 1d/2d Nanoelectronics : Integration And Device Applications, Zhaoying Hu

Legacy Theses & Dissertations (2009 - 2024)

Graphene is a one-atom thick planar monolayer of sp2-bonded carbon atoms organized in a hexagonal crystal lattice. A single walled carbon nanotube (CNT) can be thought of as a graphene sheet rolled up into a seamless hollow cylinder with extremely high length-to-diameter ratio. Their ultra-thin body, large surface area, and exceptional electronic, optical and mechanical properties make these low-dimensional carbon materials ideal candidates for electronic applications. However, adopting low-dimensional carbon materials into semiconductor industry faces significant material and integration challenges. There is an urgent need for research at fundamental and applicative levels to find a roadmap for carbon nanomaterial to …

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Elliptical Metasurfaces For Cloaking And Antenna Applications At Microwave And Terahertz Frequencies, Hossein Mehrpourbernety Jan 2015

Elliptical Metasurfaces For Cloaking And Antenna Applications At Microwave And Terahertz Frequencies, Hossein Mehrpourbernety

Electronic Theses and Dissertations

No abstract provided.

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Synchrophasor Assisted Efficient Fault Location Techniques In An Active Distribution Network, Anil Khanal Jan 2015

Synchrophasor Assisted Efficient Fault Location Techniques In An Active Distribution Network, Anil Khanal

Dissertations

Reliability of an electrical system can be improved by an efficient fault location identification for the fast repair and remedial actions. This scenario changes when there are large penetrations of distributed generation (DG) which makes the distribution system an active distribution system. An efficient use of synchrophasors in the distribution network is studied with bidirectional power flow, harmonics and low angle difference consideration which are not prevalent in a transmission network. A synchrophasor estimation algorithm for the P class PMU is developed and applied to identify efficient fault location. A fault location technique using two ended synchronized measurement is derived …

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Fault Section Identification For Power Distribution Systems Using Online Measurements, Jie Chen Jan 2015

Fault Section Identification For Power Distribution Systems Using Online Measurements, Jie Chen

Theses and Dissertations--Electrical and Computer Engineering

Fault location is very important for distribution systems, and quickly identifying the fault and restoring the system can help reduce the outage time and make the system more reliable. In this thesis, a method for locating faults on distribution systems is introduced to quickly identify the faulted feeder sections by using the overcurrent information from the switches in the system. Fuzzy logic is utilized. The proposed method can quickly and accurately locate faulted sections with different fault locations, fault types and fault resistances. The method is applicable to cases with single-faults or multi-faults, and is applicable to networks with multi-sources. …

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Performance Evaluation Of Tcp Multihoming For Ipv6 Anycast Networks And Proxy Placement, Raya Alsharfa Jan 2015

Performance Evaluation Of Tcp Multihoming For Ipv6 Anycast Networks And Proxy Placement, Raya Alsharfa

Electronic Theses and Dissertations

In this thesis, the impact of multihomed clients and multihomed proxy servers on the performance of modern networks is investigated. The network model used in our investigation integrates three main components: the new one-to-any Anycast communication paradigm that facilitates server replication, the next generation Internet Protocol Version 6 (IPv6) that offers larger address space for packet switched networks, and the emerging multihoming trend of connecting devices and smart phones to more than one Internet service provider thereby acquiring more than one IP address. The design of a previously proposed Proxy IP Anycast service is modified to integrate user device multihoming …

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Post Conversion Correction Of Non-Linear Mismatches For Time Interleaved Analog-To-Digital Converters, Charna Parkey Jan 2015

Post Conversion Correction Of Non-Linear Mismatches For Time Interleaved Analog-To-Digital Converters, Charna Parkey

Electronic Theses and Dissertations

Time Interleaved Analog-to-Digital Converters (TI-ADCs) utilize an architecture which enables conversion rates well beyond the capabilities of a single converter while preserving most or all of the other performance characteristics of the converters on which said architecture is based. Most of the approaches discussed here are independent of architecture; some solutions take advantage of specific architectures. Chapter 1 provides the problem formulation and reviews the errors found in ADCs as well as a brief literature review of available TI-ADC error correction solutions. Chapter 2 presents the methods and materials used in implementation as well as extend the state of the …

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Optimal Distribution Network Reconfiguration Using Meta-Heuristic Algorithms, Arash Asrari Jan 2015

Optimal Distribution Network Reconfiguration Using Meta-Heuristic Algorithms, Arash Asrari

Electronic Theses and Dissertations

Finding optimal configuration of power distribution systems topology is an NP-hard combinatorial optimization problem. It becomes more complex when time varying nature of loads in large-scale distribution systems is taken into account. In the second chapter of this dissertation, a systematic approach is proposed to tackle the computational burden of the procedure. To solve the optimization problem, a novel adaptive fuzzy based parallel genetic algorithm (GA) is proposed that employs the concept of parallel computing in identifying the optimal configuration of the network. The integration of fuzzy logic into GA enhances the efficiency of the parallel GA by adaptively modifying …

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Beam-Steerable And Reconfigurable Reflectarray Antennas For High Gain Space Applications, Kalyan Karnati Jan 2015

Beam-Steerable And Reconfigurable Reflectarray Antennas For High Gain Space Applications, Kalyan Karnati

Electronic Theses and Dissertations

Reflectarray antennas uniquely combine the advantages of parabolic reflectors and phased array antennas. Comprised of planar structures similar to phased arrays and utilizing quasi-optical excitation similar to parabolic reflectors, reflectarray antennas provide beam steering without the need of complex and lossy feed networks. Chapter 1 discusses the basic theory of reflectarray and its design. A brief summary of previous work and current research status is also presented. The inherent advantages and drawbacks of the reflectarray are discussed. In chapter 2, a novel theoretical approach to extract the reflection coefficient of reflectarray unit cells is developed. The approach is applied to …

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An Optimization Of Thermodynamic Efficiency Vs. Capacity For Communications Systems, Gregory Rawlins Jan 2015

An Optimization Of Thermodynamic Efficiency Vs. Capacity For Communications Systems, Gregory Rawlins

Electronic Theses and Dissertations

This work provides a fundamental view of the mechanisms which affect the power efficiency of communications processes along with a method for efficiency enhancement. Shannon's work is the definitive source for analyzing information capacity of a communications system but his formulation does not predict an efficiency relationship suitable for calculating the power consumption of a system, particularly for practical signals which may only approach the capacity limit. This work leverages Shannon's while providing additional insight through physical models which enable the calculation and improvement of efficiency for the encoding of signals. The proliferation of Mobile Communications platforms is challenging capacity …

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General Vector Explicit - Impact Time And Angle Control Guidance, Loren Robinson Jan 2015

General Vector Explicit - Impact Time And Angle Control Guidance, Loren Robinson

Electronic Theses and Dissertations

This thesis proposes and evaluates a new cooperative guidance law called General Vector Explicit - Impact Time and Angle Control Guidance (GENEX-ITACG). The motivation for GENEX-ITACG came from an explicit trajectory shaping guidance law called General Vector Explicit Guidance (GENEX). GENEX simultaneously achieves design specifications on miss distance and terminal missile approach angle while also providing a design parameter that adjusts the aggressiveness of this approach angle. Encouraged by the applicability of this user parameter, GENEX-ITACG is an extension that allows a salvo of missiles to cooperatively achieve the same objectives of GENEX against a stationary target through the incorporation …

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Enhanced Microwave Hyperthermia Using Nanoparticles, Maryory Urdaneta Jan 2015

Enhanced Microwave Hyperthermia Using Nanoparticles, Maryory Urdaneta

Electronic Theses and Dissertations

In this dissertation a study of enhanced hyperthermia for cancer treatment through the use of magnetic nanoparticles is presented. Hyperthermia has been in use for many years, as a potential alternative method in cancer treatment, and high frequency microwave radiation has been used successfully to raise the tumor temperature to around 42°C in superficial tumors without causing damage to surrounding healthy tissues. Magnetic fluid hyperthermia involves the use of magnetic nanoparticles injected into the tumor before exposure to microwave radiation. The magnetic energy in the nanoparticles is converted into heat allowing for a more rapid rise of temperature in the …

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Cascaded Digital Refinement For Intrinsic Evolvable Hardware, Vignesh Thangavel Jan 2015

Cascaded Digital Refinement For Intrinsic Evolvable Hardware, Vignesh Thangavel

Electronic Theses and Dissertations

Intrinsic evolution of reconfigurable hardware is sought to solve computational problems using the intrinsic processing behavior of System-on-Chip (SoC) platforms. SoC devices combine capabilities of analog and digital embedded components within a reconfigurable fabric under software control. A new technique is developed for these fabrics that leverages the digital resources' enhanced accuracy and signal refinement capability to improve circuit performance of the analog resources' which are providing low power processing and high computation rates. In particular, Differential Digital Correction (DDC) is developed utilizing an error metric computed from the evolved analog circuit to reconfigure the digital fabric thereby enhancing precision …

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Predictive Modeling For Assessing The Reliability Of Bypass Diodes In Photovoltaic Modules, Narendra Shiradkar Jan 2015

Predictive Modeling For Assessing The Reliability Of Bypass Diodes In Photovoltaic Modules, Narendra Shiradkar

Electronic Theses and Dissertations

Solar Photovoltaics (PV) is one of the most promising renewable energy technologies for mitigating the effect of climate change. Reliability of PV modules directly impacts the Levelized Cost of Energy (LCOE), which is a metric for cost competitiveness of any energy technology. Further reduction in LCOE of PV through assured long term reliability is necessary in order to facilitate widespread use of solar energy without the need for subsidies. This dissertation is focused on frameworks for assessing reliability of bypass diodes in PV modules. Bypass diodes are critical components in PV modules that provide protection against shading. Failure of bypass …

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A Roughness Correction For Aquarius Ocean Brightness Temperature Using The Conae Microwave Radiometer, Yazan Hejazin Jan 2015

A Roughness Correction For Aquarius Ocean Brightness Temperature Using The Conae Microwave Radiometer, Yazan Hejazin

Electronic Theses and Dissertations

Aquarius/SAC-D is a joint NASA/CONAE (Argentine Space Agency) Earth Sciences satellite mission to measure global sea surface salinity (SSS), using an L-band radiometer that measures ocean brightness temperature (Tb). The application of L-band radiometry to retrieve SSS is a difficult task, and therefore, precise Tb corrections are necessary to obtain accurate measurements. One of the major error sources is the effect of ocean roughness that "warms" the ocean Tb. The Aquarius (AQ) instrument (L-band radiometer/scatterometer) baseline approach uses the radar scatterometer to provide this ocean roughness correction, through the correlation of radar backscatter with the excess ocean emissivity. In contrast, …

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Modified System Design And Implementation Of An Intelligent Assistive Robotic Manipulator, Nicholas Paperno Jan 2015

Modified System Design And Implementation Of An Intelligent Assistive Robotic Manipulator, Nicholas Paperno

Electronic Theses and Dissertations

This thesis presents three improvements to the current UCF MANUS systems. The first improvement modifies the existing fine motion controller into PI controller that has been optimized to prevent the object from leaving the view of the cameras used for visual servoing. This is achieved by adding a weight matrix to the proportional part of the controller that is constrained by an artificial ROI. When the feature points being used are approaching the boundaries of the ROI, the optimized controller weights are calculated using quadratic programming and added to the nominal proportional gain portion of the controller. The second improvement …

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Towards Improving Human-Robot Interaction For Social Robots, Saad Khan Jan 2015

Towards Improving Human-Robot Interaction For Social Robots, Saad Khan

Electronic Theses and Dissertations

Autonomous robots interacting with humans in a social setting must consider the social-cultural environment when pursuing their objectives. Thus the social robot must perceive and understand the social cultural environment in order to be able to explain and predict the actions of its human interaction partners. This dissertation contributes to the emerging field of human-robot interaction for social robots in the following ways: 1. We used the social calculus technique based on culture sanctioned social metrics (CSSMs) to quantify, analyze and predict the behavior of the robot, human soldiers and the public perception in the Market Patrol peacekeeping scenario. 2. …

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Lyapunov-Based Robust And Adaptive Control Design For Nonlinear Uncertain Systems, Kun Zhang Jan 2015

Lyapunov-Based Robust And Adaptive Control Design For Nonlinear Uncertain Systems, Kun Zhang

Electronic Theses and Dissertations

The control of systems with uncertain nonlinear dynamics is an important field of control science attracting decades of focus. In this dissertation, four different control strategies are presented using sliding mode control, adaptive control, dynamic compensation, and neural network for a nonlinear aeroelastic system with bounded uncertainties and external disturbance. In Chapter 2, partial state feedback adaptive control designs are proposed for two different aeroelastic systems operating in unsteady flow. In Chapter 3, a continuous robust control design is proposed for a class of single input and single output system with uncertainties. An aeroelastic system with a trailingedge flap as …

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Performance Optimization Of Lateral-Mode Thin-Film Piezoelectric-On-Substrate Resonant Systems, Hedy Fatemi Jan 2015

Performance Optimization Of Lateral-Mode Thin-Film Piezoelectric-On-Substrate Resonant Systems, Hedy Fatemi

Electronic Theses and Dissertations

The main focus of this dissertation is to characterize and improve the performance of thin-film piezoelectric-on-substrate (TPoS) lateral-mode resonators and filters. TPoS is a class of piezoelectric MEMS devices which benefits from the high coupling coefficient of the piezoelectric transduction mechanism while taking advantage of superior acoustic properties of a substrate. The use of lateral-mode TPoS designs allows for fabrication of dispersed-frequency filters on a single substrate, thus significantly reducing the size and manufacturing cost of devices. TPoS filters also offer a lower temperature coefficient of frequency, and better power handling capability compared to rival technologies all in a very …

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Autonomous Robot Sphere, Robert Haver, Melissa Haver, Daniel Madden, Noah Robertson Jan 2015

Autonomous Robot Sphere, Robert Haver, Melissa Haver, Daniel Madden, Noah Robertson

Williams Honors College, Honors Research Projects

The Autonomous Robot Sphere is an interactive robot toy meant to entertain kids. The robot will locate its target and execute algorithms to autonomously evade or chase a child. The sphere will contain a platform equipped with four omni-wheels, which will allow the sphere to maneuver and change direction almost instantaneously. The robot will be configured to maintain a fixed distance from the transmitter, allowing it to chase or evade the child in response to their movement. The primary advantage of our design lies in its capability to quickly adapt to changes in direction.

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Computational Electronics For The 21st Century: Reflections On The Past, Present, And Future, Mark S. Lundstrom Jan 2015

Computational Electronics For The 21st Century: Reflections On The Past, Present, And Future, Mark S. Lundstrom

Department of Electrical and Computer Engineering Faculty Publications

The author’s career has coincided with the development of numerical simulation into an essential component of semiconductor device technology research and development. We now have a sophisticated suite of simulation capabilities along with new challenges for 21st Century electronics. This talk presents a short history of the field and a description of the current state of the art, but it concentrates on lessons learned and thoughts about how computational electronics can continue to contribute effectively to the development of new electronic device technologies. The author will argue that electronics is changing, and that computational electronics can play a key role …

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Led Learning Guitar, Kellen C. Reusser, Justin Fiser Jan 2015

Led Learning Guitar, Kellen C. Reusser, Justin Fiser

Williams Honors College, Honors Research Projects

The goal of this project is to create an electric guitar that detects and displays chords in different tunings for learning and exploration purposes. A hexaphonic pickup will generate the required signals and a processor will detect the pitch. The computer software will apply the pitch information to determine the tuning and the voicings of chords. LEDs mounted on the fretboard of the guitar will indicate a note to be played.

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An On-Orbit Calibration Procedure For Spaceborne Microwave Radiometers Using Special Spacecraft Attitude Maneuvers, Spencer Farrar Jan 2015

An On-Orbit Calibration Procedure For Spaceborne Microwave Radiometers Using Special Spacecraft Attitude Maneuvers, Spencer Farrar

Electronic Theses and Dissertations

This dissertation revisits, develops, and documents methods that can be used to calibrate spaceborne microwave radiometers once in orbit. The on-orbit calibration methods discussed within this dissertation can provide accurate and early results by utilizing Calibration Attitude Maneuvers (CAM), which encompasses Deep Space Calibration (DSC) and a new use of the Second Stokes (SS) analysis that can provide early and much needed insight on the performance of the instrument. This dissertation describes pre-existing and new methods of using DSC maneuvers as well as a simplified use of the SS procedure. Over TRMM's 17 years of operation it has provided invaluable …

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Implementation Of A Raptorq-Based Protocol For Peer To Peer Network, Yuzhu Bai Jan 2015

Implementation Of A Raptorq-Based Protocol For Peer To Peer Network, Yuzhu Bai

Electronic Theses and Dissertations

The object of this thesis is to develop and test a Ruby based implementation of the RaptorQP2P protocol. The RaptorQP2P protocol is a novel peer-to-peer protocol based on RaptorQ forward error correction. This protocol facilitates delivery of a single file to a large number of peers. It applies two levels of RaptorQ encoding to the source file before packet transmission. Download completion time using RaptorQP2P was found to be significantly improved comparing to BitTorrent. We developed a Ruby interface to the Qualcomm proprietary RaptorQ software development kit library. Then we achieved the two levels of RaptorQ encoding and decoding with …

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Visualization Of 4d Q2psk And Ce Q2psk In Ideal Bandlimited Channels, Milton I. Quinteros, Edit J. Kaminsky, Kenneth V. Cartwright Jan 2015

Visualization Of 4d Q2psk And Ce Q2psk In Ideal Bandlimited Channels, Milton I. Quinteros, Edit J. Kaminsky, Kenneth V. Cartwright

Electrical Engineering Faculty Publications

This paper presents new visualization techniques for 4D Quadrature-Quadrature Phase Shift Keying (Q2PSK), Saha’s Constant Envelope (CE) Q2PSK, and Cartwright’s CEQ2PSK in ideal bandlimited channels. The signal diagrams analyzed are: time-signal eye patterns for 4D passband signals, 2D complex trajectory diagrams of baseband signals, and time-signal eye patterns for the 1D outputs of the baseband matched filter. These methods may be applied to other multidimensional modulation systems to obtain insight into the effects of noise, interference, and channel filtering.

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Nanostructured Semiconductor Device Design In Solar Cells, Hongmei Dang Jan 2015

Nanostructured Semiconductor Device Design In Solar Cells, Hongmei Dang

Theses and Dissertations--Electrical and Computer Engineering

We demonstrate the use of embedded CdS nanowires in improving spectral transmission loss and the low mechanical and electrical robustness of planar CdS window layer and thus enhancing the quantum efficiency and the reliability of the CdS-CdTe solar cells. CdS nanowire window layer enables light transmission gain at 300nm-550nm. A nearly ideal spectral response of quantum efficiency at a wide spectrum range provides an evidence for improving light transmission in the window layer and enhancing absorption and carrier generation in absorber. Nanowire CdS/CdTe solar cells with Cu/graphite/silver paste as back contacts, on SnO2/ITO-soda lime glass substrates, yield the …

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Explorations For Efficient Reversible Barrel Shifters And Their Mappings In Qca Nanocomputing, Ke Chen Jan 2015

Explorations For Efficient Reversible Barrel Shifters And Their Mappings In Qca Nanocomputing, Ke Chen

Theses and Dissertations--Electrical and Computer Engineering

This thesis is based on promising computing paradigm of reversible logic which generates unique outputs out of the inputs and. Reversible logic circuits maintain one-to-one mapping inside of the inputs and the outputs. Compared to the traditional irreversible computation, reversible logic circuit has the advantage that it successfully avoids the information loss during computations. Also, reversible logic is useful to design ultra-low-power nanocomputing circuits, circuits for quantum computing, and the nanocircuits that are testable in nature. Reversible computing circuits require the ancilla inputs and the garbage outputs. Ancilla input is the constant input in reversible circuits. Garbage output is the …

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Multifrequency Averaging Of Hysteresis-Current-Controlled Dc-Dc Converters, Yingying Liu Jan 2015

Multifrequency Averaging Of Hysteresis-Current-Controlled Dc-Dc Converters, Yingying Liu

Theses and Dissertations--Electrical and Computer Engineering

Multifrequency averaging is one of the widely used modeling and simulation techniques today for the analysis and design of power electronic systems. This technique is capable of providing the average behavior as well as the ripple behavior of power electronic systems. Hysteresis current control has fast response and internal current stability through controlling switches to maintain the current within a given hysteresis band of a given current command. However the state space variables in a hysteresis controlled system cannot be directly approached by multifrequency averaging method because of time varing switching frequency. In this thesis, a method of applying multifrequency …

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