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Evaluating The Effectiveness Of Training System Approaches For Highly Complex Flight Training, Maria Bauer
Evaluating The Effectiveness Of Training System Approaches For Highly Complex Flight Training, Maria Bauer
Electronic Theses and Dissertations
This research investigates the Training Effectiveness of a low-cost, PC-based training system when compared with two modes (motion and no motion) of a cab training system with large screen for various aviation flying tasks. While much research on this topic has been done in the past, advances in technology have significantly altered what is considered a "low-cost" "simulator." The technology advances have in effect increased the ability of a "low-cost" "simulator" to deliver desired experiences to the user. These "simulators" often are nothing more than PC training system, with only notional representations of the actual aircraft. This research considers the …
Numerical Study Of A High-Speed Miniature Centrifugal Compressor, Xiaoyi Li
Numerical Study Of A High-Speed Miniature Centrifugal Compressor, Xiaoyi Li
Electronic Theses and Dissertations
A miniature centrifugal compressor is a key component of a reverse Brayton cycle cryogenic cooling system. The system is commonly used to generate a low cryogenic temperature environment for electronics to increase their efficiency, or generate, store and transport cryogenic liquids, such as liquid hydrogen and oxygen, where space limit is also an issue. Because of space limitation, the compressor is composed of a radial inlet guide vane, a radial impeller and an axial-direction diffuser (which reduces the radial size because of smaller diameter). As a result of reduction in size, in order to obtain the required static pressure ratio/rise, …
Creating Models Of Internet Background Traffic Suitable For Use In Evaluating Network Intrusion Detection Systems, Song Luo
Electronic Theses and Dissertations
This dissertation addresses Internet background traffic generation and network intrusion detection. It is organized in two parts. Part one introduces a method to model realistic Internet background traffic and demonstrates how the models are used both in a simulation environment and in a lab environment. Part two introduces two different NID (Network Intrusion Detection) techniques and evaluates them using the modeled background traffic. To demonstrate the approach we modeled five major application layer protocols: HTTP, FTP, SSH, SMTP and POP3. The model of each protocol includes an empirical probability distribution plus estimates of application-specific parameters. Due to the complexity of …
Achieving Cost-Effective Supply Chain Agility For The Semiconductor Industry, Mariah Jeffery
Achieving Cost-Effective Supply Chain Agility For The Semiconductor Industry, Mariah Jeffery
Electronic Theses and Dissertations
Supply chain agility has been receiving a lot of attention in recent literature as a way for organizations to become more responsive to change and improve customer service levels. However, agility is typically dealt with qualitatively, and organizations are usually unsure of the steps to take to improve their agility and the customer service level to target. This research studies supply chain agility based on a case study of Intel Corporation, a large semiconductor manufacturer. Here, agility is defined as the ability to satisfy customer demands by reacting effectively to changes in market stimuli. Reacting effectively does not mean reacting …
Analyzing The Community Structure Of Web-Like Networks: Models And Algorithms, Aurel Cami
Analyzing The Community Structure Of Web-Like Networks: Models And Algorithms, Aurel Cami
Electronic Theses and Dissertations
This dissertation investigates the community structure of web-like networks (i.e., large, random, real-life networks such as the World Wide Web and the Internet). Recently, it has been shown that many such networks have a locally dense and globally sparse structure with certain small, dense subgraphs occurring much more frequently than they do in the classical Erdös-Rényi random graphs. This peculiarity--which is commonly referred to as community structure--has been observed in seemingly unrelated networks such as the Web, email networks, citation networks, biological networks, etc. The pervasiveness of this phenomenon has led many researchers to believe that such cohesive groups of …
Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-Valent Iron, Neil Stewart
Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-Valent Iron, Neil Stewart
Electronic Theses and Dissertations
Remediation of trichloroethylene (TCE) and other chlorinated solvents is of great concern due to their toxicity and their persistence in the environment. Iron has been used extensively in the past decade as a subsurface reactive agent for the remediation of dense, nonaqueous-phase liquids (DNAPLs). Permeable reactive barrier walls (PRBW) have been installed at many sites around the country to treat contaminated plumes resulting from the presence of DNAPL pools. The use of zero-valent metals, such as iron, to effectively reductively dechlorinate DNAPLs has been employed as the reactive material in these PRBWs (Gillham et al., 1993). However, limited work has …
Part I : Isolation Of Dipentyl 2-(4-(Pentan-3-Yl) Phenyl) Malonate From Sanguisorba Officinalis Labill Part Ii: Synthesis Of A Novel Family Of Ethers Of Podocarpic Acid, Manjeera Yalavarty
Part I : Isolation Of Dipentyl 2-(4-(Pentan-3-Yl) Phenyl) Malonate From Sanguisorba Officinalis Labill Part Ii: Synthesis Of A Novel Family Of Ethers Of Podocarpic Acid, Manjeera Yalavarty
Electronic Theses and Dissertations
The goal of part I of this thesis was to isolate pure anti cancer compounds from the Russian plant Sanguisorba officinalis. This plant was selected for investigation because it showed 100% activity against leukemia (L1210 mouse leukemia cells) during the preliminary screening of approximately 100 Russian plant extracts. This work has resulted in the isolation of novel compound 11 using traditional chromatography techniques. Compound 11 was characterized with spectroscopic techniques such as IR, 1H NMR, 13C NMR, DEPT, DQCOSY and MS. Compound 11 was assigned the structure dipentyl 2-(4-(pentan-3-yl) phenyl) malonate. The goal of part II of this thesis was …
Planning And Scheduling For Large-Scaledistributed Systems, Han Yu
Planning And Scheduling For Large-Scaledistributed Systems, Han Yu
Electronic Theses and Dissertations
Many applications require computing resources well beyond those available on any single system. Simulations of atomic and subatomic systems with application to material science, computations related to study of natural sciences, and computer-aided design are examples of applications that can benefit from the resource-rich environment provided by a large collection of autonomous systems interconnected by high-speed networks. To transform such a collection of systems into a user's virtual machine, we have to develop new algorithms for coordination, planning, scheduling, resource discovery, and other functions that can be automated. Then we can develop societal services based upon these algorithms, which hide …
Graph-Theoretic Approach To Modeling Propagation And Control Of Network Worms, Zoran Nikoloski
Graph-Theoretic Approach To Modeling Propagation And Control Of Network Worms, Zoran Nikoloski
Electronic Theses and Dissertations
In today's network-dependent society, cyber attacks with network worms have become the predominant threat to confidentiality, integrity, and availability of network computing resources. Despite ongoing research efforts, there is still no comprehensive network-security solution aimed at controling large-scale worm propagation. The aim of this work is fivefold: (1) Developing an accurate combinatorial model of worm propagation that can facilitate the analysis of worm control strategies, (2) Building an accurate epidemiological model for the propagation of a worm employing local strategies, (3) Devising distributed architecture and algorithms for detection of worm scanning activities, (4) Designing effective control strategies against the worm, …
Super High-Speed Miniaturized Permanent Magnet Synchronous Motor, Liping Zheng
Super High-Speed Miniaturized Permanent Magnet Synchronous Motor, Liping Zheng
Electronic Theses and Dissertations
This dissertation is concerned with the design of permanent magnet synchronous motors (PMSM) to operate at super-high speed with high efficiency. The designed and fabricated PMSM was successfully tested to run upto 210,000 rpm The designed PMSM has 2000 W shaft output power at 200,000 rpm and at the cryogenic temperature of 77 K. The test results showed the motor to have an efficiency reaching above 92%. This achieved efficiency indicated a significant improvement compared to commercial motors with similar ratings. This dissertation first discusses the basic concept of electrical machines. After that, the modeling of PMSM for dynamic simulation …
Adapting The Modified Cam Clay Constitutive Model To The Computational Analysis Of Dense Granular Soils, Jose Arvelo
Adapting The Modified Cam Clay Constitutive Model To The Computational Analysis Of Dense Granular Soils, Jose Arvelo
Electronic Theses and Dissertations
The computational constitutive Modified Cam Clay Model (MCCM) was developed at Cambridge to study the behavior of clays and has been proven to be effective. In this study, this model is extended to the case of dense sands to analyze the accuracy of the stress-strain behavior. This analysis is based on triaxial test data applied to remolded and compacted sand samples under drained conditions. The laboratory triaxial tests were performed by the Florida Department of Transportation to research the permeability effect in sandy soils compacted up to 95% of maximum unit weight at the optimum moisture content. Each soil sample …
Contributions To Automatic Particle Identification In Electron Micrographs: Algorithms, Implementation, And Applications, Vivek Singh
Electronic Theses and Dissertations
Three dimensional reconstruction of large macromolecules like viruses at resolutions below 8 Ã… - 10 Ã… requires a large set of projection images and the particle identification step becomes a bottleneck. Several automatic and semi-automatic particle detection algorithms have been developed along the years. We present a general technique designed to automatically identify the projection images of particles. The method utilizes Markov random field modelling of the projected images and involves a preprocessing of electron micrographs followed by image segmentation and post processing for boxing of the particle projections. Due to the typically extensive computational requirements for extracting hundreds of …
Multizoom Activity Recognition Using Machine Learning, Raymond Smith
Multizoom Activity Recognition Using Machine Learning, Raymond Smith
Electronic Theses and Dissertations
In this thesis we present a system for detection of events in video. First a multiview approach to automatically detect and track heads and hands in a scene is described. Then, by making use of epipolar, spatial, trajectory, and appearance constraints, objects are labeled consistently across cameras (zooms). Finally, we demonstrate a new machine learning paradigm, TemporalBoost, that can recognize events in video. One aspect of any machine learning algorithm is in the feature set used. The approach taken here is to build a large set of activity features, though TemporalBoost itself is able to work with any feature set …
Rr Interval Estimation From An Ecg Using A Linear Discrete Kalman Filter, Arun Janapala
Rr Interval Estimation From An Ecg Using A Linear Discrete Kalman Filter, Arun Janapala
Electronic Theses and Dissertations
An electrocardiogram (ECG) is used to monitor the activity of the heart. The human heart beats seventy times on an average per minute. The rate at which a human heart beats can exhibit a periodic variation. This is known as heart rate variability (HRV). Heart rate variability is an important measurement that can predict the survival after a heart attack. Studies have shown that reduced HRV predicts sudden death in patients with Myocardial Infarction (MI). The time interval between each beat is called an RR interval, where the heart rate is given by the reciprocal of the RR interval expressed …
Oceanic Rain Identification Using Multifractal Analysis Of Quikscat Sigma-0, Vasud Ganesh Torsekar
Oceanic Rain Identification Using Multifractal Analysis Of Quikscat Sigma-0, Vasud Ganesh Torsekar
Electronic Theses and Dissertations
The presence of rain over oceans interferes with the measurement of sea surface wind speed and direction from the Sea Winds scatterometer and as a result wind measurements contain biases in rain regions. In past research at the Central Florida Remote Sensing Lab, it has been observed that rain has multi-fractal behavior. In this report we present an algorithm to detect the presence of rain so that rain regions are flagged. The forward and aft views of the horizontal polarization σ0 are used for the extraction of textural information with the help of multi-fractals. A single negated multi-fractal exponent is …
Beyond The Death Of The Subject : Suicide In The Works Of Dostoevsky, Camus And Hemingway, William Jared Hogue
Beyond The Death Of The Subject : Suicide In The Works Of Dostoevsky, Camus And Hemingway, William Jared Hogue
Electronic Theses and Dissertations
No abstract provided.
The Effects Of An Arts-Integrated Curriculum Compared To A Text-Based Curriculum In Sixth Grade Social Studies, Joanna Floyd
The Effects Of An Arts-Integrated Curriculum Compared To A Text-Based Curriculum In Sixth Grade Social Studies, Joanna Floyd
Electronic Theses and Dissertations
No abstract provided.
Multicultural Music Perspectives Of Faculty Members At The University Of Mississippi / By Jill A. Ward, Jill A. Ward
Multicultural Music Perspectives Of Faculty Members At The University Of Mississippi / By Jill A. Ward, Jill A. Ward
Electronic Theses and Dissertations
No abstract provided.
New Optimal High Efficiency Dsp-Based Digital Controller Design For Super High-Speed Permanent Magnet Synchronous Motor, Limei Zhao
Electronic Theses and Dissertations
This dissertation investigates digital controller and switch mode power supply design for super high-speed permanent magnet synchronous motors (PMSM). The PMSMs are a key component for the miniaturic cryocooler that is currently under development at the University of Central Florida with support from NASA Kennedy Space Center and the Florida Solar Energy Center. Advanced motor design methods, control strategies, and rapid progress in semiconductor technology enables production of a highly efficient digital controller. However, there are still challenges for such super high-speed controller design because of its stability, high-speed, variable speed operation, and required efficiency over a wide speed range. …
Infrared Thermography And High Accuracy Gps For Automated Asphalt Crack Detection, Tarek M. Abdel-Monem
Infrared Thermography And High Accuracy Gps For Automated Asphalt Crack Detection, Tarek M. Abdel-Monem
Electronic Theses and Dissertations
Roads are major public assets. The USA spends billions of dollars each year on road construction and maintenance. To keep these roads in a healthy condition and for better planning and allocation of maintenance budgets, knowledge of distressed locations is needed. Roads develop cracks when they are subjected to stresses that exceed their designed criteria or their materials properties. Early detection and repair of cracks has proven to be the most cost-effective strategy in limiting the damage to roads and reducing expenditures. Various methodologies of crack detection were developed and significant techniques were made in the last few years. One …
Coherence Properties Of Optical Near-Fields, Debbie Arthur
Coherence Properties Of Optical Near-Fields, Debbie Arthur
Electronic Theses and Dissertations
The National Science Education Standards (1996) support inquiry-based instruction. According to the National Science Education Standards. When children or scientists inquire into the natural world they: ask questions, plan investigations and collect relevant data, and organize and analyze collected data. The purpose of this study was to investigate the effects of inquiry-based instruction on third-grade students' attitudes and participation in an elementary science classroom. Students were encouraged to ask and answer their own questions. In this study, analysis of data gathered form: pre and post survey, student journals, teacher field notes, and student interviews were triangulated to provide the support …
The Effects Of Electrode Geometry On Current Pulse Caused By Electrical Discharge Over An Ultra-Fast Laser Filament, Matthew Bubelnik
The Effects Of Electrode Geometry On Current Pulse Caused By Electrical Discharge Over An Ultra-Fast Laser Filament, Matthew Bubelnik
Electronic Theses and Dissertations
The time-resolved electrical conductivity of a short-pulse generated plasma filament in air was studied. Close-coupled metal electrodes were used to discharge the stored energy of a high-voltage capacitor and the resulting microsecond-scale electrical discharge was measured using fast current sensors. Significant differences in the time dependence of the current were seen with the two electrode geometries used. Using sharp-tipped electrodes additional peaks in the time-resolved conductivity were seen, relative to the single peak seen with spherical electrodes. We attribute these additional features to secondary electron collisional ionization brought about by field enhancement at the tips. Additional discrepancies in the currents …
An Introduction To Hellmann-Feynman Theory, David Wallace
An Introduction To Hellmann-Feynman Theory, David Wallace
Electronic Theses and Dissertations
The Hellmann-Feynman theorem is presented together with certain allied theorems. The origin of the Hellmann-Feynman theorem in quantum physical chemistry is described. The theorem is stated with proof and with discussion of applicability and reliability. Some adaptations of the theorem to the study of the variation of zeros of special functions and orthogonal polynomials are surveyed. Possible extensions are discussed.
Improving Scalability For Networked Virtual Environments, Darko Milovanovic
Improving Scalability For Networked Virtual Environments, Darko Milovanovic
Electronic Theses and Dissertations
No abstract provided.
Art, Aesthetics, And Ecology : Creating A High School Curriculum, Ashley Elizabeth Kalemjian
Art, Aesthetics, And Ecology : Creating A High School Curriculum, Ashley Elizabeth Kalemjian
Electronic Theses and Dissertations
No abstract provided.
Classroom Observations Of Attention-Deficit/Hyperactivity Disorder: Patterns And Characteristics Of Attention Over Time, Thomas M. Timko Jr.
Classroom Observations Of Attention-Deficit/Hyperactivity Disorder: Patterns And Characteristics Of Attention Over Time, Thomas M. Timko Jr.
Electronic Theses and Dissertations
Investigated differences in attentional processes between children diagnosed with Attention-Deficit/Hyperactivity Disorder (ADHD) and their classroom peers. Models of attention gleaned from laboratory experiments provided a theoretical structure for hypothesizing between-group attentional differences. Seventy-five children with ADHD and 36 normal control children were observed in their regular classrooms over a 1-week time interval. Explication of between-group differences revealed that children with ADHD were approximately 21% less attentive on average. Both groups exhibited an accelerating-decelerating pattern of attention over time, however, children with ADHD cycled at a rate twice that of same-aged peers. Six variables derived from observed attention were examined for …
A New Hybrid Diffractive Photo-Mask Technology, Jin Won Sung
A New Hybrid Diffractive Photo-Mask Technology, Jin Won Sung
Electronic Theses and Dissertations
In the field of photolithography for micro-chip manufacturing, the photo-mask is used to print desired patterns on a proper photo-resist on wafer. The most common type of photo-mask is binary amplitude mask made an opaque layer of chrome. The principle and potential application of hybrid photo-mask with diffractive phase element and binary amplitude is presented in this dissertation paper from both numerical modeling and experimental research. The first important application is the characterization of aberration in the stepper system using hybrid diffractive photo-mask. By utilizing multiple diffractive illumination conditions, it is possible to characterize Zernike wave front aberration coefficients up …
The Influence Of Past Abuse On Heterosexual Cohabiting Couples' Relationship Types, Page Thanasiu
The Influence Of Past Abuse On Heterosexual Cohabiting Couples' Relationship Types, Page Thanasiu
Electronic Theses and Dissertations
This study investigated the influence of past witnessed or experienced abuse on heterosexual cohabiting couples' Premarital Personal and Relationship Evaluation for Cohabiting Couples (PREPARE-CC) couple relationship types. The researcher utilized preexisting data from 5,000 cohabiting couples who had previously participated in the PREPARE marriage preparation program and had completed the PREPARE-CC inventory including a demographic section that elicited information about past abuse. Discriminant analysis was conducted in SPSS to answer the question of whether the presence of past witnessed or experienced abuse could successfully predict relationship type among cohabiting couples. Results of the discriminant analysis yielded no significant ability to …
Integrating Journal Writing With Inquiry Based Science Instruction In A Second Grade Classroom, Lauren Zissman
Integrating Journal Writing With Inquiry Based Science Instruction In A Second Grade Classroom, Lauren Zissman
Electronic Theses and Dissertations
This action research study investigated the effects of using science journals to promote science writing and to investigate changes in student attitudes in a second grade inquiry-based science class. This was an action research study in which qualitative and quantitative data was collected. The data was collected using science journals, pre and post inventories, field notes, teacher observations, videotaped science inquiry lessons, and surveys. The students demonstrated a true fondness for journal writing and expressed interest in continued use. After concluding this action research study, I better understand the benefits of utilizing journal writing to enhance my teaching of the …
Simulation Studies Of Self-Assembly And Phase Diagram Of Amphiphilic Molecules, Geuorgui Kostadinov Bourov
Simulation Studies Of Self-Assembly And Phase Diagram Of Amphiphilic Molecules, Geuorgui Kostadinov Bourov
Electronic Theses and Dissertations
The aim of this dissertation is to investigate self-assembled structures and the phase diagram of amphiphilic molecules of diverse geometric shapes using a number of different computer simulation methods. The semi-realistic coarse-grained model, used extensively for simulation of polymers and surfactant molecules, is adopted in an off-lattice approach to study how the geometric structure of amphiphiles affects the aggregation properties. The results of simulations show that the model system behavior is consistent with theoretical predictions, experiments and lattice simulation models. We demonstrate that by modifying the geometry of the molecules, self-assembled aggregates are altered in a way close to theoretical …