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Electronic Theses and Dissertations

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Articles 211 - 221 of 221

Full-Text Articles in Computer Engineering

Creating Geo-Specific Road Databases From Aerial Photos For Driving Simulation, Dahai Guo Jan 2005

Creating Geo-Specific Road Databases From Aerial Photos For Driving Simulation, Dahai Guo

Electronic Theses and Dissertations

Geo-specific road database development is important to a driving simulation system and a very labor intensive process. Road databases for driving simulation need high resolution and accuracy. Even though commercial software is available on the market, a lot of manual work still has to be done when the road crosssectional profile is not uniform. This research deals with geo-specific road databases development, especially for roads with non-uniform cross sections. In this research, the United States Geographical Survey (USGS) road information is used with aerial photos to accurately extract road boundaries, using image segmentation and data compression techniques. Image segmentation plays ...


Off-Chip Communications Architectures For High Throughput Network Processors, Jacob Engel Jan 2005

Off-Chip Communications Architectures For High Throughput Network Processors, Jacob Engel

Electronic Theses and Dissertations

In this work, we present off-chip communications architectures for line cards to increase the throughput of the currently used memory system. In recent years there is a significant increase in memory bandwidth demand on line cards as a result of higher line rates, an increase in deep packet inspection operations and an unstoppable expansion in lookup tables. As line-rate data and NPU processing power increase, memory access time becomes the main system bottleneck during data store/retrieve operations. The growing demand for memory bandwidth contrasts the notion of indirect interconnect methodologies. Moreover, solutions to the memory bandwidth bottleneck are limited ...


Digital Control Of Half-Bridge Dc-Dc Converters With Current Doubler Rectification, Liangbin Yao Jan 2005

Digital Control Of Half-Bridge Dc-Dc Converters With Current Doubler Rectification, Liangbin Yao

Electronic Theses and Dissertations

DC-DC power converters play an important role in powering telecom and computing systems. Complex systems, including power electronics systems, are increasingly using digital controllers because of the major advancements in digital controllers and DSP as well as there ability to perform sophisticated and enhanced control schemes. In this thesis, the digital controller is investigated for DC-DC converters in high current low voltage applications. For an optimal design of a regulated DC-DC converter, it is necessary to derive a valid model. The current doubler rectified half bridge (CDRHB) DC-DC converter is suitable for high current low voltage applications. In this thesis ...


Expression Morphing Between Different Orientations, Tao Fu Jan 2004

Expression Morphing Between Different Orientations, Tao Fu

Electronic Theses and Dissertations

How to generate new views based on given reference images has been an important and interesting topic in the area of image-based rendering. Two important algorithms that can be used are field morphing and view morphing. Field morphing, which is an algorithm of image morphing, generates new views based on two reference images which were taken at the same viewpoint. The most successful result of field morphing is morphing from one person's face to the other one's face. View morphing, which is an algorithm of view synthesis, generates in between views based on two reference views which were ...


Data Bandwidth Reduction Techniques For Distributed Embedded Simulatio, Hubert Bahr Jan 2004

Data Bandwidth Reduction Techniques For Distributed Embedded Simulatio, Hubert Bahr

Electronic Theses and Dissertations

Maintaining coherence between the independent views of multiple participants at distributed locations is essential in an Embedded Simulation environment. Currently, the Distributed Interactive Simulation (DIS) protocol maintains coherence by broadcasting the entity state streams from each simulation station. In this dissertation, a novel alternative to DIS that replaces the transmitting sources with local sources is developed, validated, and assessed by analytical and experimental means. The proposed Concurrent Model approach reduces the communication burden to transmission of only synchronization and model-update messages. Necessary and sufficient conditions for the correctness of Concurrent Models in a discrete event simulation environment are established by ...


A Mobile Robotic Computing Platform For Three-Dimensional Indoor Mappi, Kenneth Mccoig Jan 2004

A Mobile Robotic Computing Platform For Three-Dimensional Indoor Mappi, Kenneth Mccoig

Electronic Theses and Dissertations

There are several industries exploring solutions to quickly and accurately digitize unexplored indoor environments, into useable three-dimensional databases. Unfortunately, there are inherent challenges to the indoor mapping process such as, scanning limitations and environment complexity, which require a specific application of tools to map an environment precisely with low cost and high speed. This thesis successfully demonstrates the design and implementation of a low cost mobile robotic computing platform with laser scanner, for quickly mapping with high resolution, urban and/or indoor environments using a gyro-enhanced orientation sensor and selectable levels of detail. In addition, a low cost alternative solution ...


Web-Based Circuit Design Simulation Package For Solving Electrical Eng, Shadi Harb Jan 2004

Web-Based Circuit Design Simulation Package For Solving Electrical Eng, Shadi Harb

Electronic Theses and Dissertations

A Web-based circuit design package has been improved and evaluated to provide students with an enhanced and innovative teaching tools package for the electrical circuit design course. The project objectives can be summarized as follows: 1) developing enhanced problem solving skills using a Web-based environment, 2) developing the design skills and sharpening the critical thinking process, 3) developing a generic and comprehensive teaching/learning circuit package as an extention to the Electrical Engineering virtual lab environment, which gives students the capability to practice and experience all the circuit design skills with minimum cost and effort. The project provides the students ...


An Approach For Computing Intervisibility Using Graphical Processing U, Judd Tracy Jan 2004

An Approach For Computing Intervisibility Using Graphical Processing U, Judd Tracy

Electronic Theses and Dissertations

In large scale entity-level military force-on-force simulations it is essential to know when one entity can visibly see another entity. This visibility determination plays an important role in the simulation and can affect the outcome of the simulation. When virtual Computer Generated Forces (CGF) are introduced into the simulation these intervisibilities must now be calculated by the virtual entities on the battlefield. But as the simulation size increases so does the complexity of calculating visibility between entities. This thesis presents an algorithm for performing these visibility calculations using Graphical Processing Units (GPU) instead of the Central Processing Units (CPU) that ...


Data Transmission Scheduling For Distributed Simulation Using Packet A, Juan Vargas-Morales Jan 2004

Data Transmission Scheduling For Distributed Simulation Using Packet A, Juan Vargas-Morales

Electronic Theses and Dissertations

Communication bandwidth and latency reduction techniques are developed for Distributed Interactive Simulation (DIS) protocols. Using logs from vignettes simulated by the OneSAF Testbed Baseline (OTB), a discrete event simulator based on the OMNeT++ modeling environment is developed to analyze the Protocol Data Unit (PDU) traffic over a wireless flying Local Area Network (LAN). Alternative PDU bundling and compression techniques are studied under various metrics including slack time, travel time, queue length, and collision rate. Based on these results, Packet Alloying, a technique for the optimized bundling of packets, is proposed and evaluated. Packet Alloying becomes more active when it is ...


Gene Expression Data Analysis Using Fuzzy Logic, Robert Reynolds Jan 2001

Gene Expression Data Analysis Using Fuzzy Logic, Robert Reynolds

Electronic Theses and Dissertations

DNA microarray technology allows for the parallel analysis of the expression of genes in an organism. The wealth of spatio-temporal data provided by the technology allows us to attempt to reverse engineer the genetic network. Fuzzy logic has been proposed as a method of analyzing the relationships between genes as well as their corresponding proteins. Combinations of genes are entered into a fuzzy model of gene interaction and evaluated on the basis of how well the combination fits the model. Those combinations of genes that fit the model are likely to be related. However, current analysis algorithms are slow and ...


Preprocessing Of Microcirculatory Images., Mohamed S. Mansour Aug 1995

Preprocessing Of Microcirculatory Images., Mohamed S. Mansour

Electronic Theses and Dissertations

This thesis project consists of the development of a computerized image processing system to preprocess microvascular images of the mouse Latisimus Dorsi Muscle (LDM). This research has been conducted in association with the Division of Plastic and Reconstructive Surgery at the University of Louisville. The input to the system is a set of 35 or more overlapping microscopic fields or sub_images containing segments of the LDM microcirculation, the output is an adjacent single montage encompassing the entire LDM microvasculature. The developed system presents practical solutions to the problems of image registration, overlap resolution, and image segmentation, in addition, the results ...