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Articles 151 - 180 of 656

Full-Text Articles in Electrical and Computer Engineering

Sparse Array For Wireless Sensor Networks And Wireless Communications, Hao Liang May 2017

Sparse Array For Wireless Sensor Networks And Wireless Communications, Hao Liang

Electrical Engineering Dissertations - Archive

Underwater target detection and recognition has been widely used nowadays. In this dissertation, we show that the 3-D nested-array system can provide O(N^2) degree of freedom by using only N physical sensors when the second order statistics of the received data is used, which means we can use less sensors to get a better performance. We propose a maximum likelihood (ML) estimation algorithm for underwater target size detection. Theoretical analysis illustrates that our underwater sensor network can tremendously reduce the variance of target estimation. We show that our ML estimator is unbiased and the variance of parameter estimation matches the …

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Lung Nodule Detection And Segmentation Using A Patch-Based Multi-Atlas Method, Mustafa Alam May 2017

Lung Nodule Detection And Segmentation Using A Patch-Based Multi-Atlas Method, Mustafa Alam

Electrical Engineering Dissertations - Archive

CT image based lung nodule detection is the most widely used and accepted method for detecting lung cancer. Most CT image based methods rely on supervised learning, which has a high number of false positives and need a large amount of pre-segmented training samples. These problems can be solved if an optimally small number of training sample images can be created, where each sample has lung nodules of similar size and shape as the target image of the actual patient. Based on this hypothesis, two algorithms are proposed for 2D CT images and 3D CT images respectively. Both algorithms use …

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Multi-Object Detection And Tracking In Sensor Networks And Video Sequences, Guohua Ren May 2017

Multi-Object Detection And Tracking In Sensor Networks And Video Sequences, Guohua Ren

Electrical Engineering Dissertations - Archive

Firstly the problem of tracking multiple objects using observations acquired at spatially scattered sensors is considered here. Sensors are measuring a sort of signal attenuation from the present targets/sources. Multiple moving targets may die and be born at some point of the monitored period while the states of the sources, e.g. temperature of a fire source, CO/CO2 density of gas source, are also changing with time. In the case of targets tracking, radar signals sent out by sensors and later bounced back from the surface of the targets are measured at sensors, and the task is to find out the …

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Simulation And Design Of Microbolometers For 5-14 Μm Wavelength At Oblique Incidence, Arkadeep Mitra May 2017

Simulation And Design Of Microbolometers For 5-14 Μm Wavelength At Oblique Incidence, Arkadeep Mitra

Electrical Engineering Theses - Archive

A mathematical model was developed to calculate the total power absorbed and total power reflected for a microbolometer for oblique incidence of light viz. s and p polarization by varying the angle of incidence from 1 to 89 degrees. The mathematical model was simulated using matlab in five different sensor structures. A comparative study based on simulation involving the different sensor structures was done. The maximum partial absorbed power for s polarization was 0.9559-0.0000i, 0.9112-0.0000i, 0.9617-0.0000i, 0.3057-0.0000i, 0.9627-0.000i for sensor structure I, 1, 2, 3, 4 at angle of incidence of 73 degree, 1 degree, 66-67 degree, 1-3 degree, 60 …

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A Study Of Consensus And Collision Avoidance In A Platoon Of Vehicles Using Adaptive Cruise Control, Audrey Devin Porter May 2017

A Study Of Consensus And Collision Avoidance In A Platoon Of Vehicles Using Adaptive Cruise Control, Audrey Devin Porter

Electrical Engineering Theses - Archive

Vehicle platooning has been the subject of much research. Transfer function analysis of intervehicle distance errors is traditionally utilized to analyze the string stability of platoons. Consensus theory has been the subject of recent study of close-loop stability of platoons. This thesis extends the cooperative control approach to platoon behavior analysis to include the leader as an internal source of information for the communication graph of a platoon. A 1-Leader Type (1LT) graph is defined and an equation is proposed for the formation consensus values of leader and follower nodes in a platoon. Simulations are performed to support the proposed …

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Structural And Electrical Characterization Of Single Crystalline Srzrxti₁-Xo₃ Thin Films On Germanium, Reza Matthew Moghadam May 2017

Structural And Electrical Characterization Of Single Crystalline Srzrxti₁-Xo₃ Thin Films On Germanium, Reza Matthew Moghadam

Electrical Engineering Dissertations - Archive

The epitaxial growth of crystalline oxides on semiconductors provides a pathway to introduce new functionalities to semiconductor devices. Key to coupling crystalline oxides to semiconductors electrically, to realize functional behavior, is controlling the manner in which their bands align at the interfaces. This document reports on the three research projects on Crystalline Oxide/Semiconductor heterostructures. In the first project we applied principles of band-gap engineering traditionally used at heterojunctions between conventional semiconductors to control the band offset between a single crystalline oxide and a semiconductor. Reactive molecular beam epitaxy is used to realize atomically abrupt and structurally coherent interfaces between SrZrxTi1-xO3 …

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Channel Coding Techniques For 5g Using Polar Codes, Supreet Huilgol May 2017

Channel Coding Techniques For 5g Using Polar Codes, Supreet Huilgol

Electrical Engineering Theses - Archive

Coding and modulation in the crown known as the communications technology, embodies a national basic theory of the overall strength of communication science. Channel coding is a way of encoding data in a communication channel that adds patterns of redundancy into the transmission path in order to lower the error rate. Such methods are widely used in wireless communications. 5G is the coming fifth-generation wireless broadband technology based on the IEEE 802.11ac standard. 5G will provide better speeds and coverage than the current 4G. It operates with a 5 Ghz signal and is set to offer speeds of up to …

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Homogeneous Transcoding Of Hevc (H.265), Ninad Gorey May 2017

Homogeneous Transcoding Of Hevc (H.265), Ninad Gorey

Electrical Engineering Theses - Archive

Video transcoding is an essential tool to promote inter-operability between different video communication systems. This thesis presents a cascaded architecture for homogeneous transcoding of High Efficiency Video Coding. Cascaded Transcoding model decodes the input video sequence and follows the procedure of reference encoder, with the difference being a higher QP value. The encoder will code the sequence with the goal of achieving highest coding performance, and since the encoder is not restricted by any means, it is reasonable to assume that the coding performance is the best possible transcoding performance. H.265 is the latest video coding standard which supports encoding …

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Sparse Sampling And Array In Signal Processing, Na Wu May 2017

Sparse Sampling And Array In Signal Processing, Na Wu

Electrical Engineering Dissertations - Archive

Sparse sampling and sparse arrays have attracted lots of interests in recent years. In this dissertation, we firstly apply nested sampling and co-prime sampling to ultra-wide band radar, which require us to extend the algorithms from stationary signals to non-stationary signals. After that, the synthetic aperture radar data is compressed through singular-value QR-decomposition algorithm. The dissertation also proposes an approach to turn low resolution images into high resolution (HR) images. We extend co-prime sampling structure to interpolation in order to improve the resolution of reconstructed images through compressive sensing (CS). Compared to the direct CS method and conventional interpolation method, …

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Feature Selection Using An Extended Piecewise Linear Orthonormal Floating Search, Rohit Rawat Dec 2016

Feature Selection Using An Extended Piecewise Linear Orthonormal Floating Search, Rohit Rawat

Electrical Engineering Dissertations - Archive

The piecewise linear orthonormal floating search (PLOFS) is a wrapper method for feature selection that uses a piecewise linear network (PLN) to evaluate candidate subsets. PLOFS has difficulty working on high dimensional data due to overfitting and poor clustering in the PLN subset evaluation function (SEF), and high computational complexity. The presence of noise features aggravates these problems. In order to improve upon the SEF used by PLOFS we mapped the PLN to a SPLN. Then a second order embedded feature selection was used to generate improved distance measure weights. Next, a second order method for positioning center vectors was …

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Dynamic Wireless Interrogation Of Antenna‐Sensor In Harsh Environment, Jun Yao Dec 2016

Dynamic Wireless Interrogation Of Antenna‐Sensor In Harsh Environment, Jun Yao

Electrical Engineering Dissertations - Archive

Microstrip antenna-sensor has received considerable interests in recent years due to its simple configuration, compact size, and multi-modality sensitivity. Due to its simple and conformal planar configuration, antenna-sensor can be easily attached on the structure surface for Structure Health Monitoring (SHM). As a promising sensor, the resonant frequency of the antenna-sensor is sensitive to different structure properties: such as planar stress, temperature, pressure and moisture. As a passive antenna, antenna-sensor’s resonant frequency can be wirelessly interrogated at a middle range distance without using an on-board battery. However, a major challenge of antenna-sensor’s wireless interrogation is to isolate the antenna backscattering …

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Trajectory Tracking Control Of A Quadrotor During Cooperative Operation Between Uav And Ugv, Ajibola S. Fowowe Dec 2016

Trajectory Tracking Control Of A Quadrotor During Cooperative Operation Between Uav And Ugv, Ajibola S. Fowowe

Electrical Engineering Theses - Archive

In recent times, there has been an increase in the use and application of unmanned aerial vehicles (UAVs). UAVs are used for various operations ranging from military applications to civilian purposes such as traffic monitoring, photography, surveillance and others. Within the UAV family, rotorcrafts take precedence over the fixed wing aircraft especially because of their unique features such as vertical takeoff and landing, increased payload, high maneuverability and more. They can be used to perform dangerous tasks and access environments that pose danger to man such as observatory wood and building fire, military purposes etc. This project focused on one …

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Implementation Of A Java Processor On A Fpga, Omkar Joshi Dec 2016

Implementation Of A Java Processor On A Fpga, Omkar Joshi

Electrical Engineering Theses - Archive

Java, a programming language developed by Sun Microsystems in 1991, now managed by Oracle, has become one of the most popular computer languages for application development. This popularity can be credited to Java being architectural neutral and portable. It means that a Java program executed on any computer will yield the same result, irrespective of the underlying hardware. When a Java program is compiled it creates a Java class file. The class file contains instructions known as Bytecodes, which are executed by the Java Virtual Machine (JVM). The JVM is an abstract processor, which interprets and translates the bytecodes into …

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Optimal Attribute Weighting In A Nearest Neighbor Classifier, Jugal Raju Sheth Dec 2016

Optimal Attribute Weighting In A Nearest Neighbor Classifier, Jugal Raju Sheth

Electrical Engineering Theses - Archive

Nearest Neighbor algorithms are non-parametric algorithms that use distance measure techniques for classification and regressions. This thesis, first improves the traditional nearest neighbor classifier by optimizing its distance measure using a second order training algorithm. It then presents a second order method to adjust center vectors. It is shown that the distance measure weight optimization and center vector optimization, individually and together reduce the final classification error. The testing error of our algorithm is shown to be less than that of LVQ V.2.1

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Enhanced Customer Demand Load Profiles Estimation Algorithms For Field Application, Xin Wang Aug 2016

Enhanced Customer Demand Load Profiles Estimation Algorithms For Field Application, Xin Wang

Electrical Engineering Dissertations - Archive

Due to the deregulation of the power system, the electric power industry is undergoing a transformation in terms of its planning and operation strategies. Because of the importance in reducing financial and operational risk, improving load forecasting accuracy is paramount. In some load forecasting applications, K-means clustering is used to group customers prior to forecasting. This method has been shown to improve the accuracy of load predictions. However, there are situations where K-means clustering reduces load forecasting accuracy. This dissertation studies the factors that affect the performance of K-means clustering. The data used for validating the proposed strategies associated with …

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Ultra-Thin Aluminum Nitride Thin Films For Flexible Mems Sensors, Md Sajeeb Rayhan Aug 2016

Ultra-Thin Aluminum Nitride Thin Films For Flexible Mems Sensors, Md Sajeeb Rayhan

Electrical Engineering Dissertations - Archive

Microelectromechanical systems (MEMS) sensors using ultrathin aluminum nitride (AlN) film were developed and fabricated using conventional photolithography techniques in the class 100 clean room with a view to integrate them in flexible substrates along with flexible electronics. The MEMS sensors were designed, analytically modeled, fabricated and characterized. Some of the MEMS sensors were only designed and simulated using finite element method (FEM) for the scope of the dissertation. These MEMS sensors can be applied to many applications such as automobile, robotics, biomedical, biometrics, health condition monitoring, GPS tracking devices, smartphones and aircrafts. MEMS pressure sensors using AlN based piezoelectric film …

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The Impact Of External And Self-Induced Magnetic Fields On The Development Of Corrosion On Ferous And Non-Ferrous Materials, Clint G. Gnegy-Davidson Aug 2016

The Impact Of External And Self-Induced Magnetic Fields On The Development Of Corrosion On Ferous And Non-Ferrous Materials, Clint G. Gnegy-Davidson

Electrical Engineering Dissertations - Archive

As the US Navy continues to field ships with an increasing number of electrical generators and loads, it is unclear how the high magnetic fields being generated throughout the ship will affect the corrosion rate of the ships structural and high current conducting alloys. Given the high- pulsed current carried by pulsed power systems, it is of increased interest to understand what impact their deployment will have on metallic corrosion. In this work, a number of experiments have been designed and performed to study these phenomena. In the first set of experiments several alloys have been subjected to a continuous, …

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Multi-Modal Sensory Input And Novel Interfaces For Robotic Prosthetic Devices, Joseph Sanford Aug 2016

Multi-Modal Sensory Input And Novel Interfaces For Robotic Prosthetic Devices, Joseph Sanford

Electrical Engineering Dissertations - Archive

Automated systems have progressed to begin allowing for Human-robot interaction and collaboration in the workplace and rehabilitation settings. Seamless collaboration between robotic systems and users requires intuitive modes of interaction and systems with advanced sensing capabilities. The research presented below focuses on identifying human intent through safe, intuitive and optimized input method and sensing. In this dissertation novel sensor input modalities for Human-Robot Interaction (HRI) are discussed, fundamental research regarding physical Human-Robot Interaction (pHRI) is presented, and solutions towards optimal placement of sensors to facilitate intuitive interfaces are shown. EMG and Pressure: EMG and intrasocket pressure sensors are used in …

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Multi-Channel All-Optical Signal Processing, Lu Li Aug 2016

Multi-Channel All-Optical Signal Processing, Lu Li

Electrical Engineering Dissertations - Archive

We experimentally demonstrate, for the first time to our knowledge, a stand-alone all-optical regenerator capable of simultaneous 2R regeneration of multiple WDM channels. Recently, our group has proposed an all-optical 2R regeneration scheme for multiple WDM channels. This novel multi-channel regenerator is a modified configuration of Mamyshev 2R regenerator, in which a conventional highly-nonlinear-fiber (HNLF) is replaced by a novel group-delay-managed (GDM) nonlinear medium. The proposed multi-channel regeneration scheme uses multiple concatenated GDM unit cells, where each unit cell contains a piece of HNLF and a periodic-group-delay device (PGDD). Afterwards, the proof-of-principle experiment has also been demonstrated by using a …

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Ac Arc Flash Light Intensity Estimator And Mhd Based Dc Arc Model, Shiuan-Hau Rau Aug 2016

Ac Arc Flash Light Intensity Estimator And Mhd Based Dc Arc Model, Shiuan-Hau Rau

Electrical Engineering Dissertations - Archive

Since the light emitted by arc flash is significantly brighter than the normal lighting background, the light sensors have been applied to the arc flash detection. Currently, the optically based arc flash relaying has been considered as the fastest available protection for arc flash hazard reduction. Although it is well known that high intensity light will be emitted during arc flash event and the human delicate eye structures, such as retina or cornea, can be damaged by the sudden bright light, there are limited research providing the quantitative light intensity estimation during different arcing incidents. This dissertation proposes an arc …

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Time-Triggered Controller Area Network Design For Formula Sae Racecars And Technique For Measuring Cpu Usage On Systems With Nested And Non-Nested Interrupts, Randy Kyle Long Aug 2016

Time-Triggered Controller Area Network Design For Formula Sae Racecars And Technique For Measuring Cpu Usage On Systems With Nested And Non-Nested Interrupts, Randy Kyle Long

Electrical Engineering Theses - Archive

This document presents a design method and example for a time-triggered CAN (TTCAN) system which reduces latency, variability in transmission frequency, and increases data throughput relative to the traditional free-for-all CAN (FFACAN) transmission system. In addition to performance considerations for a TTCAN transmission scheme, this document also presents a simple method for measuring CPU usage on embedded systems that use either nested or non-nested interrupts. Systems that use non-nested interrupts may have their performance measured with a single GPIO pin; systems that use nested interrupts require one pin per interrupt service routine.

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Mux/Demux Of Hevc/H.265 Video Stream With He-Aac V2 Audio Bit Stream And To Achieve Lip Synch, Deepika Pagala Aug 2016

Mux/Demux Of Hevc/H.265 Video Stream With He-Aac V2 Audio Bit Stream And To Achieve Lip Synch, Deepika Pagala

Electrical Engineering Theses - Archive

The increasing demand for video and the increase in the number of devices enable of supporting digital media facilitate the enormous demand for video streaming over internet and and Internet Protocol Television (IPTV) applications. The high bit rates that result from the various types of digital video make their transmission through their intended channels very difficult. Hence it becomes necessary to select a good compression scheme to overcome storage and transportation problems of the digital video. High Efficiency Video Coding (HEVC) is an international standard for video compression developed by a working group of ISO/IEC MPEG (Moving Picture Experts Group) …

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Second Order Algorithm For Sparsely Connected Neural Networks, Parastoo Kheirkhah Aug 2016

Second Order Algorithm For Sparsely Connected Neural Networks, Parastoo Kheirkhah

Electrical Engineering Theses - Archive

A systematic two-step batch approach for constructing a sparse neural network is presented. Unlike other sparse neural networks, the proposed paradigm uses orthogonal least squares (OLS) to train the network. OLS based pruning is proposed to induce sparsity in the network. Based on the usefulness of the basic functions in the hidden units, the weights connecting the output to hidden units and output to input units are modified to form a sparse neural network. The proposed hybrid training algorithm has been compared with the fully connected MLP and sparse softmax classifier that uses second order training algorithm. The simulation results …

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Leak Detector System For Positive Airway Pressure Machines, Aishwarya Gopalakrishnan Aug 2016

Leak Detector System For Positive Airway Pressure Machines, Aishwarya Gopalakrishnan

Electrical Engineering Theses - Archive

The project aims to develop a system to indicate leaks occurring in a Positive Airway Pressure (PAP) machine which sends a passage of air to the patients suffering from sleep apnea, through a hose and a nose mask. The system uses programming software to record and analyse the data obtained from the sensors and provides an interface for the user to select a method for notifying the time instant and location of leak occurrences.The system used an approach of using sensors for leak detection. Two pressure sensors and two audio sensors were selected out of which, one pressure sensor and …

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Smartphone-Based Crowd Sourcing Of Bicycle And Pedestrian Conflict Data For Transportation Safety Assessment, Rahul Ankushrao Kawadgave Aug 2016

Smartphone-Based Crowd Sourcing Of Bicycle And Pedestrian Conflict Data For Transportation Safety Assessment, Rahul Ankushrao Kawadgave

Electrical Engineering Theses - Archive

This thesis presents the idea of mobile application development that aims at data collection for transportation safety assessment using cloud-based database. At present, transportation safety assessment relies only on data available from crash, accident reports. In combination with this crash data, it is possible that conflict data can become a very influential performance measure for transportation safety assessment. A transportation conflict happens when two parties cross a path and one party must take an action to avoid a collision or a crash. Such conflicts can occur between different transportation elements or parties like vehicle drivers, bicyclists, pedestrians. This project helps …

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Active Flyback Based Battery Management System With Proportional Balancing For Use In An Electric Race Car, Matthew Martin Aug 2016

Active Flyback Based Battery Management System With Proportional Balancing For Use In An Electric Race Car, Matthew Martin

Electrical Engineering Theses - Archive

Battery management systems are responsible for many tasks, most important of which is maintaining balance amongst the cells in a series string to prevent excess aging and unsafe operating conditions \cite{WhyBMS1}\cite{WhyBMS2}. In lithium-ion battery packs, traditionally, and almost exclusively in the world at large today, balancing is achieved by switching a resistor in parallel with high cells to bleed energy out of them and dissipate it as heat. This tactic is not only 100 percent inefficient, but it is slow due to power dissipation restrictions typically thermally imposed within a system, and it is only effective at preventing over-voltage conditions. …

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Adaptive Torque Control Of A Robotic Manipulator, Drew F. Waller Aug 2016

Adaptive Torque Control Of A Robotic Manipulator, Drew F. Waller

Electrical Engineering Theses - Archive

In this thesis, I present the theory and application of enabling intuitive control and physical interaction between a human operator and a mobile manipulator. To do so, the model of the manipulator was estimated for its kinematic and inertial properties. Specifically selected in this project was the Kuka youBot for its ease of use and wide academic availability. With thorough modeling of this device that included the arm as well as the base, and advanced control and guidance techniques, an adaptive controller was used to guide the manipulator towards a goal trajectory with great accuracy. The goal trajectory was built …

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The Design And Control Of A Battery-Supercapacitor Hybrid Energy Storage Module For Naval Applications, Isaac J. Cohen May 2016

The Design And Control Of A Battery-Supercapacitor Hybrid Energy Storage Module For Naval Applications, Isaac J. Cohen

Electrical Engineering Dissertations - Archive

As the Navy transitions to a more electrical fleet, the electrical architectures must adapt to the changing load profiles. With the introduction of electrical propulsion and new types of electrical energy based weapons, load profiles have become higher power and more transient than ever seen before – especially during directed energy weapon operation. One issue that has become apparent with the introduction of these transient loads is the ability of traditional generation sources, such as fossil fuel generators, to power them. Generators are stiff sources of power which suffer efficiency losses when they deviate from operating at a constant maximum …

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Silicon Nitride Devices For Nonlinear And Quantum Optics Applications, Sarath Chandra Samudrala May 2016

Silicon Nitride Devices For Nonlinear And Quantum Optics Applications, Sarath Chandra Samudrala

Electrical Engineering Dissertations - Archive

The technology of fabricating photonic devices on silicon wafers using the well established CMOS process methodology has been under active investigation for several years. In particular, microring resonators have been shown to have several applications in telecommunications, in sensors and in nonlinear and quantum optics. This dissertation presents theoretical details and experimental results of silicon-nitride-based microring resonators fabricated on silicon wafers. The theoretical details of optical waveguides and numerical simulations of submicron thick waveguides are discussed. Later, the fabrication details of microring resonators and the experimental results of transmission properties of these microrings are presented. Further, the dispersion in microrings …

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Cooperative Control Of Multiple Untethered Magnetic Microrobots For Precision Micromanipulation, Nahum Arenas Torres May 2016

Cooperative Control Of Multiple Untethered Magnetic Microrobots For Precision Micromanipulation, Nahum Arenas Torres

Electrical Engineering Dissertations - Archive

The field of untethered microrobotics has emerged within the last two decades for its applications potential in military surveillance, micro and nano manufacturing, as well as in health care for minimal invasive surgery and drug delivery. Microrobots need to be fast and precise in order to be useful as a tool for manufacturing applications. It is well understood that at this size scale numerous challenges prevail such as stiction between microrobot and environment, providing power, locomotion control, and intelligence to microrobots and motion measurement. In order to accelerate the research in this field, I participated in the Mobile Microrobotics Challenge …

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