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Full-Text Articles in Electrical and Computer Engineering
Analysis And Improvement Of Multiple Optimal Learning Factors For Feed-Forward Networks, Praveen Jesudhas
Analysis And Improvement Of Multiple Optimal Learning Factors For Feed-Forward Networks, Praveen Jesudhas
Electrical Engineering Theses
The effects of transforming the net function vector in the Multilayer Perceptron (MLP) are analyzed. The use of optimal diagonal transformation matrices on the net function vector is proved to be equivalent to training the MLP using multiple optimal learning factors (MOLF). A method for linearly compressing large ill-conditioned MOLF Hessian matrices into smaller well-conditioned ones is developed. This compression approach is shown to be equivalent to using several hidden units per learning factor. The technique is extended to large networks. In simulations, the proposed algorithm performs almost as well as the Levenberg Marquardt (LM) algorithm with the computational complexity …
A Tutorial On Lte Evolved Utran (Eutran) And Lte Self Organizing Networks (Son), Dhruv Sunil Shah
A Tutorial On Lte Evolved Utran (Eutran) And Lte Self Organizing Networks (Son), Dhruv Sunil Shah
Electrical Engineering Theses
The third-generation (3G) cellular communication technology, Universal Mobile Terrestrial System (UMTS), based on Wideband Code-Division Multiple Access (WCDMA), has been widely deployed all over the world providing faster download speeds for data (packet) communications. To further improve the throughput and overall performance of the cellular communication system established by UMTS, the Third Generation Partnership Project (3GPP) in November 2004 launched an ambitious project called the Long Term Evolution (LTE) of UMTS. This would ensure the continued competitiveness of the UMTS in the future. The technical specifications of the LTE project are formally known as the Evolved UMTS Terrestrial Radio Access …
The Self-Heating Effects Of Bipolar Juction Transistors On The Functionality Of A Current Feedback Amplifier, Xuesong Xie
The Self-Heating Effects Of Bipolar Juction Transistors On The Functionality Of A Current Feedback Amplifier, Xuesong Xie
Electrical Engineering Dissertations
Self-heating effects strongly affect the performance of modern silicon-on-insulator (SOI) bipolar junction transistors. This research work does an extensive analysis of self-heating effects on large-signal behavior, small-signal behavior and transient operation of bipolar junction transistors. The two mechanisms in which device temperature affects large-signal behavior of a BJT transistor are investigated, i.e. the common-emitter (CE) configuration is to be driven by a constant base-emitter voltage and a constant base current. It is shown that the output characteristic of a BJT transistor is less sensitive to self-heating under a fixed base current than a fixed base-emitter voltage. A simple method of …
Position Sensorless Control Of A Magnetically Levitated (Maglev) System, Esteban Ricardo Noboa
Position Sensorless Control Of A Magnetically Levitated (Maglev) System, Esteban Ricardo Noboa
Electrical Engineering Dissertations
The main focus of this investigation is the development and implementation of a sensorless position estimation method and hysteresis position controller for a laboratory-based Maglev system. The proposed estimation method and controller are first validated through modeling and simulation. This sensorless scheme makes use of the maglev system's magnetic signature, namely, its inductance and requires only active phase current measurements. These measurements are then used along with the phase voltage equation to estimate position information that is in a one-to-one correspondence with the system's inductance. The theoretical aspects of the sensorless scheme are described. Finite element analysis (FEA) as well …
Convert Uhf Rfid Tag From Passive To Semi-Passive Tag Using External Power Sources, Tanvi Mehta
Convert Uhf Rfid Tag From Passive To Semi-Passive Tag Using External Power Sources, Tanvi Mehta
Electrical Engineering Theses
In this thesis, I present novel circuit designs that convert a passive radio frequency identification (RFID) tag into a semi-passive RFID tag. Passive RFID tags are relatively inexpensive to purchase and to integrate into objects and devices. However, in some environments and on some objects the performance of the pure passive tags is not sufficient for the intended applications. A semi-passive tag, in comparison to a pure passive tag, has significantly greater communication range since the semi-passive tag derives its operational power from an on-tag power source instead of just from an interrogator's communication signal. As a result, semi-passive tags …
Capacitive Strain Sensors For Measurement Of Large Strain For Structural Health Monitoring, Clement Jacob
Capacitive Strain Sensors For Measurement Of Large Strain For Structural Health Monitoring, Clement Jacob
Electrical Engineering Theses
Structural health monitoring (SHM) is increasingly used to replace time based management, with a more efficient Condition Based Maintenance (CBM). The traditional scheme of scheduling down time for aircraft inspection or periodic evaluation of civil infrastructure costs millions of dollars in maintenance due to either downtime or lack of timely maintenance. SHM involves periodic, real time sampling and analysis of signals, from onboard sensors like accelerometer, pressure, strain or acoustic sensors to determine the condition of the structure. This can be used to carry out immediate repairs as well as predict failure. We report the development of a new high …
Tutorial On Network Quality And Ims Services Used In Lte, Ayush Maheshwari
Tutorial On Network Quality And Ims Services Used In Lte, Ayush Maheshwari
Electrical Engineering Theses
3rd Generation or 3G technologies like WCDMA, HSPA and GPRS are very advanced technologies in themselves. They allow data downlink speeds of up to 7Mbps and will soon be offering up to 14Mbps. The number of people using these networks has crossed 70 million users worldwide and with ever increasing users we need to provide a solution to handle the new and improved services which are being designed daily to work on mobile devices. Long Term Evolution (LTE), will be one of the two technologies which will meet the ITU's IMT-Advanced requirements for 4G technologies. 3G Partnership Project (3GPP) is …
A Tutorial On Functionality Of Wimax And It's Performace Evaluation, Amay Dhirendra Umradia
A Tutorial On Functionality Of Wimax And It's Performace Evaluation, Amay Dhirendra Umradia
Electrical Engineering Theses
Recently, there have been tremendous developments on wireless communication technology which have predicted to replace the wirelined system and provide incredible bandwidth to the consumers. The IEEE standard for this technology is known as 802.16e (Mobile WiMAX) which was officially published in the year 2006. WiMAX would provide broadband access to rural and developing countries where the option of DSL, cable and Wi-Fi is unavailable. This Thesis provides a tutorial overview of 802.16. The information for this article is gathered from The Institute of Electrical and Electronics Engineers (IEEE) website, the WiMAX forum website and other resources on the internet. …
An Ultra Wide Band Cmos Low Noise Amplifier Design, Nahusha Bhadravati Mohankumar
An Ultra Wide Band Cmos Low Noise Amplifier Design, Nahusha Bhadravati Mohankumar
Electrical Engineering Theses
An RF ultra wide band low noise amplifier designed for the frequency range of 12-18 GHz of operation is presented in this paper. The low noise amplifier is designed using the state-of-the-art complementary metal oxide semiconductor 45 nm technology. Berkeley's Predictive Technology Model (PTM) is used to generate a fairly accurate mathematical model and the SPICE data is implemented into the BSIM 4 version of the Advanced Design Systems (ADS) program. The low noise design strategy is mainly based on the analysis of high frequency CMOS operation. This LNA has two stages: the first stage is a RL feedback amplifier …
A High Fill Factor Cmos Image Sensor For Ir Camera Applications, Daniel Mcbride
A High Fill Factor Cmos Image Sensor For Ir Camera Applications, Daniel Mcbride
Electrical Engineering Theses
In this thesis, a unit cell for high-SNR applications is presented. The proposed circuit is significantly smaller than other circuits that perform dark current subtraction because less circuitry is used inside the unit cell. The proposed circuit uses only two transistors and one resistor inside each unit cell to suppress the dark current. The size of the circuit in the layout is 25 um x 25 µm. With this new unit cell and routing approach, the size of the unit cell was reduced by 300% compared to other circuits which also suppress dark current.
Wavelet Based Array Comparative Genomic Hybridization And Mass Spectrometry Data Analysis, Nha Nguyen
Wavelet Based Array Comparative Genomic Hybridization And Mass Spectrometry Data Analysis, Nha Nguyen
Electrical Engineering Dissertations
As a highly efficient technique, array-based comparative genomic hybridization (aCGH) methods allow the simultaneous measurement of genomic DNA copy number at hundreds or thousands of loci and the reliable detection of local one-copy-level variations. The identification of these DNA copy number changes provides insights to facilitate both the basic understanding of cancer and its diagnosis. In order to effectively analyze aCGH data, various techniques have been proposed to help researchers smooth the DNA copy number data and subsequently to quantify the alterations. In this thesis, many wavelet based methods are proposed to smooth and segment the aCGH data that is …
Real Time Condition Monitoring Of Chemical Batteries, Anahita Banaei
Real Time Condition Monitoring Of Chemical Batteries, Anahita Banaei
Electrical Engineering Dissertations
Li-Ion batteries are suitable rechargeable choices for electric and hybrid electric vehicle (EV/HEV) applications due to their relatively high level of energy and power density. One of the important issues in automotive batteries is to monitor their online state-of-charge (SOC) and state-of-health (SOH).Hence, development of an efficient method for monitoring their online state-of-charge (SOC) and state-of-health (SOH) is of high importance for vehicular applications. Open circuit voltage, as one parameter used for predicting the SOC of the battery, is not readily available during charge and discharge cycles. A wide variety of research has been done on SOC and SOH estimation …
Complexity Reduction For Vp6 To H.264 Transcoder Using Motion Vector Reuse, Jay R. Padia
Complexity Reduction For Vp6 To H.264 Transcoder Using Motion Vector Reuse, Jay R. Padia
Electrical Engineering Theses
VP6 is a video coding standard developed by On2 Technologies, Inc. It is the preferred codec for Macromedia Flash 8 video. VP6 gained importance with Macromedia Flash emerging as a widely adopted video streaming technology over the internet. H.264 is currently one of the most widely accepted video coding standards in the industry. It enables high quality video at low bitrates. Adobe adopted H.264 for its Flash video in August 2007. Adobe looks at adoption of H.264 as a major step towards enabling high quality video on the web. Hence there is increasing importance of techniques which can convert video …
Alternative Matching Schemes For Automatic Fingerprint Identification Systems, Michael Jason Futer
Alternative Matching Schemes For Automatic Fingerprint Identification Systems, Michael Jason Futer
Electrical Engineering Theses
Biometrics is a recognition technology that uses the unique behavioral and physiological traits of the human body as identifiers. The fingerprint is one of the oldest and most widely used forms of biometric identifiers. In this thesis, an automatic fingerprint identification system designed by a previous Electrical Engineering graduate student at The University of Texas at Arlington is upgraded with the purpose of improving matching accuracy. A review of the baseline automatic fingerprint identification system is provided as a reference point for improvements in the system. Then, improvements to the image enhancement stage of the baseline system are discussed. They …
A Ph Sensor Based On A Flexible Substrate, Wen-Ding Huang
A Ph Sensor Based On A Flexible Substrate, Wen-Ding Huang
Electrical Engineering Dissertations
pH sensor is an essential component used in many chemical, food, and bio-material industries. Conventional glass electrodes have been used to construct pH sensors, however, have some disadvantages. Glass electrodes are easily affected by alkaline or HF solution, they require a high input impedance pH meter, they often exhibit a sluggish response. In some specific applications, it is also difficult to use glass electrodes for in vivo biomedical or food monitoring applications due to the difficulty of size miniaturization, planarization and polymerization based on current manufacturing technologies. In this work, we have demonstrated a novel flexible pH sensor based on …
Implementation And Performance Analysis Of 2-D Order 16 Integer Transforms In H.264/Avc And Avs-Video For High Definition Video Coding, Madhu Peringassery Krishnan
Implementation And Performance Analysis Of 2-D Order 16 Integer Transforms In H.264/Avc And Avs-Video For High Definition Video Coding, Madhu Peringassery Krishnan
Electrical Engineering Theses
H.264/AVC and AVS-video are two video coding standards that have 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 them. 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 in signal/image is concentrated in a fewer number of coefficients. Thus the insignificant coefficients can be discarded after transform coding to achieve compression. …
Failure Assessment In Aerospace Systems Via Integrated Multi-Functional Sensors, Ismail Erkin Gonenli
Failure Assessment In Aerospace Systems Via Integrated Multi-Functional Sensors, Ismail Erkin Gonenli
Electrical Engineering Dissertations
Integrated sensors fabricated on flexible substrates show lots of promise due to their ability to conform on non-planar surfaces. Potential applications could be smart-skin and wearable electronics which can be used on prosthetic devices or in harsh environments to provide with the sense of feel of the ambient. Design, fabrication and characterization of MEMS piezoresistive pressure sensors and capacitive accelerometers were done on Si and flexible polymer substrates using surface micromachining to be used on aerospace applications. Devices were successfully tested on planar surfaces.For the pressure sensor fabrication, Si3N4 was used as a membrane material due to its linearity and …
Mems Piezoresistive Pressure Sensor On Flexible Substrates Using Nichrome And Cnt/Polyimide Nanocomposites Piezoresistors, Gaviraj Nadvi
Mems Piezoresistive Pressure Sensor On Flexible Substrates Using Nichrome And Cnt/Polyimide Nanocomposites Piezoresistors, Gaviraj Nadvi
Electrical Engineering Theses
Micro pressure sensors using nichrome as piezoresistor were fabricated on silicon and flexible substrates. The pressure sensors on flexible substrate can be used for prosthetic skin applications. The devices were successfully tested using different methods.Micromachined pressure/force sensors using nickel chromium piezoresistors have been investigated experimentally and through finite element mesh analysis. The pressure/force sensors were designed using a suspended aluminum oxide membrane with optimally placed piezoresistors to measure the strain in the membrane when deflected with an applied force or pressure. Different devices, each with varying size and shape of both the membrane and the piezoresistors were designed, fabricated, and …
Photonic Crystal Cavities For Spectrally-Selective Optoelectronic Devices, Hongjun Yang
Photonic Crystal Cavities For Spectrally-Selective Optoelectronic Devices, Hongjun Yang
Electrical Engineering Dissertations
Photonic crystal (PC) structures exhibit unconventional dispersion and refractive properties making possible hitherto not realizable optical and optoelectronic devices with high spectral selectivity. Functional PC devices (e.g., optical filters, reflectors, and photo detectors and light emitters) on both Si and III-V semiconductor material systems were fabricated via E-Beam lithography (EBL). The device layer can be further transferred onto foreign substrates such as glass or plastic (PET), using a low-cost "wet nanomembrane transfer technique" developed in this study.The broadband membrane reflectors (MR) based on Fano resonances in patterned silicon nanomembranes have been demonstrated. Resonance control of the reflectors was realized either …
Improved Classification In Flat Networks, Madhu Gannapal
Improved Classification In Flat Networks, Madhu Gannapal
Electrical Engineering Theses
It is shown that optimal flat networks can be found as solutions to least squares problems. An algorithm is presented to improve existing classifier training methods by changing the desired outputs. The algorithm is based on minimum probability of error. The algorithm's performance is compared with those of other algorithms including the Bayes Gaussian classifier. The Convergence of training and the effects of outliers are analyzed in all the algorithms presented here.
Distribution Network Contingency Analysis And Contingency Detection With The Consideration Of Load Models, Qiaohui Hu
Distribution Network Contingency Analysis And Contingency Detection With The Consideration Of Load Models, Qiaohui Hu
Electrical Engineering Dissertations
The electric utility market environment has changed quite radically during recent years due to the process of deregulation. This has changed the asset management towards a capital controlled business where owners are trying to maximize their profits with cost optimization. To keep up with the increase demands on high reliability and high quality delivery systems, many utilities endeavor to rationalize their system operations with more intelligent control schemes and facilities. A lot of issues under uncertainty such as load growth, quality of supply and environmental impact affect the reliability of the distribution system. Power outage is the most serious challenge …
Develpoment Of An Electronically Controlled Cold Plasma Reformer For Hydrogen Harvest From Bio-Fuels, Job Brunet
Develpoment Of An Electronically Controlled Cold Plasma Reformer For Hydrogen Harvest From Bio-Fuels, Job Brunet
Electrical Engineering Theses
The energy demand on the world market due to the limited resources has forced governments and scientists to find an alternative source of fuel to ease the burden on its populous and environment. Moreover, the rate of global warming is increasing with the rate of carbon dioxide released from emissions from coal burning power plants and also from vehicle exhaust. This trend of burn now and fix later has to end and a new source of fuel must be developed. Wind, solar, and even nuclear are great substitutes for reducing the global pollution but a new tangible fuel is required. …
Light Trapping And Absorption Enhancement For High Performance Solar Cells And Infrared Photodetectors, Li Chen
Electrical Engineering Dissertations
This dissertation presents the work on light trapping and absorption enhancement in solar cells and infrared photodetectors. Hemispherical microstructure based omni-directional anti reflection (Omni-AR) coating has been designed and developed for solar cells, based on rigorous coupled-wave analysis (RCWA) and convective coating process. Omni-AR coating enhances light absorption in solar cells, due to the reduced reflection on the structured solar cell surfaces, and the increased optical path length (OPL) inside the solar cells. Omni-AR coating has been demonstrated as a cost-effective light trapping approach for different material systems, with very low reflection and high transmission over a large range of …
Adaptive Methods For Realistic And Intuitive Human-Robot Interaction, Jartuwat Rajruangrabin
Adaptive Methods For Realistic And Intuitive Human-Robot Interaction, Jartuwat Rajruangrabin
Electrical Engineering Dissertations
Due to the advancement in robotics and computer technology, having access to sophisticated robot hardware is becoming common. An increase in the number of robots allows one to achieve different kind of tasks by exploiting cooperation, such as: robot swarms, object manipulation using multiple degrees of freedom of different robots. It is quite challenging for the human operator to coordinate multiple robots to achieve a task in an efficient manner. The channels available to receive feedback information from the robot system can vary from simple encoder reading to video stream acquisition of the robot system performing tasks. It is important …
A Comparison Method To Evaluate Motion Splicing Techniques, George Thekkanath Raphael
A Comparison Method To Evaluate Motion Splicing Techniques, George Thekkanath Raphael
Electrical Engineering Theses
The development of methods for the re-use and modification of motion data is an activearea of research. Among these methods, we find automatic techniques to generate a spliced motion by combining different actions recorded in separate sessions. Motion splicing allows capturing motion independently and later combining them to create a new natural looking motion. Even though there have been a lot of research on motion editing techniques, less focus has been given to evaluate these edited motions. In this thesis, we present a novel methodology to quantitatively evaluate the synthesized motion generated by different motion editing techniques. We implemented three …
Low Complexity H.264 To Vc-1 Transcoder, Vidhya Vijayakumar
Low Complexity H.264 To Vc-1 Transcoder, Vidhya Vijayakumar
Electrical Engineering Theses
The high definition video adoption has been growing rapidly for the last five years. The H.264 and VC-1 coding standards are two of the recent and dominant coding standards. Compared to H.264, VC-1 is less complex but capable of achieving the same visual quality as H.264. Hence there is increasing importance of techniques which can convert video from H.264 to VC-1 and thereby enable mobile devices to work with less complex codecs. While there has been recent work on VC-1 to H.264 transcoding, the published work on H.264 to VC-1 transcoding is nearly non-existent. This has created the motivation to …
Predition Of Torque And Radial Forces In Permanent Magnet Synchronous Machines Using Field Reconstruction Method, Banharn Sutthiphornsombat
Predition Of Torque And Radial Forces In Permanent Magnet Synchronous Machines Using Field Reconstruction Method, Banharn Sutthiphornsombat
Electrical Engineering Theses
Due to their high torque-to-loss ratio, permanent magnet synchronous machines (PMSM) have received increasing attention in automotive applications over the past decade. Because of this unique characteristics, many applications have utilized PMSM. In addition to high efficiency, quiet operation of the machines is desirable in automotive, naval and military applications. In order to operate at high efficiency quietly, the torque pulsation or torque ripple needs to be monitored and mitigated accurately. Magnitude of the torque ripple is influenced by the magnetic design (cogging torque) and excitation, and the pattern of ripple is affected by the machine's geometry (stator slots).Field reconstruction …
Optimal Output Gain Algorithm For Feed-Forward Network Training, Babu Hemanth Kumar Aswathappa
Optimal Output Gain Algorithm For Feed-Forward Network Training, Babu Hemanth Kumar Aswathappa
Electrical Engineering Theses
A batch training algorithm for feed-forward networks is proposed which uses Newton's method to estimate a vector of optimal scaling factors for output errors in the network. Using this vector, backpropagation is used to modify weights feeding into the hidden units. Linear equations are then solved for the network's output weights. Elements of the new method's Gauss-Newton Hessian matrix are shown to be weighted sums of elements from the total network's Hessian. The effect of output transformation on training a feed-forward network is reviewed and explained, using the concept of equivalent networks. In several examples, the new method performs better …
Multi-Wavelength All-Optical 2r Regeneration, Pallavi Govind Patki
Multi-Wavelength All-Optical 2r Regeneration, Pallavi Govind Patki
Electrical Engineering Dissertations
We experimentally demonstrate, for the first time to our knowledge, simultaneous all-optical 2R regeneration of multiple WDM channels. In the recent work [1], our group has proposed an all-optical 2R regeneration scheme capable of handling multiple WDM channels simultaneously. Our proposed multi-channel regenerator is a modified configuration of Mamyshev's 2R regenerator [2], in which a conventional highly-nonlinear-fiber (HNLF) is replaced by a novel dispersion-managed nonlinear medium. The proposed multi-channel regeneration scheme uses multiple concatenated dispersion-managed sections, where each dispersion-managed section contains a piece of HNLF and a periodic-group-delay device (PGDD). For the proof-of-principle demonstration of the regenerator we have built …
Detection And Severity Classification Of Rotor Imbalance Faults In Induction Machines, Himanshu Jain
Detection And Severity Classification Of Rotor Imbalance Faults In Induction Machines, Himanshu Jain
Electrical Engineering Theses
As world economy continues to globalize, increased competition has lead to a reduction in profit margins. To remain competitive in such an economy, an industry needs to reduce the downtime of critical components even for maintenance purposes. However, this should not jeopardize the genuine maintenance needs of the equipments. In other words, an optimized maintenance strategy is needed, in which maintenance is performed only when a need for it arises; unlike the currently popular periodic maintenance. Condition based Maintenance (CBM) is one such strategy. Induction machines are work horse of an industry. Their criticality to industry may be gauged by …