Digital Commons Network^™

Support For Statistical Analysis Of The Configurable Port Simulation (Cports), Saurav Mazumdar

Electrical & Computer Engineering Theses & Dissertations

The primary objective of this thesis is to provide support for statistical analysis of CPortS: a transportation logistics simulation, which models the movement of military traffic through seaports and the interaction of the traffic with port infrastructure. By any standards, CPortS is a very large, data intensive simulation. It provides capabilities for analyzing many important issues such as port clearance and throughput. CPortS was classically run in single run mode. Only a single replication of the simulation was performed and conclusions were drawn from the results obtained. Users and analysts of CPortS performed multiple runs only to see the effect …

Yet Another Algorithm For Pitch Tracking (Yaapt), Kavita Kasi

Electrical & Computer Engineering Theses & Dissertations

This thesis presents a pitch detection algorithm that is extremely robust for both high quality and telephone speech. The kernel method for this algorithm is the Normalized Cross Correlation (NCCF) reported by David Talkin [16]. Major innovations include: processing of the original acoustic signal and a nonlinearly processed version of the signal to partially restore very weak F0 components; intelligent peak picking to select multiple F0 candidates and assign merit factors; and, incorporation of highly robust pitch contours obtained from smoothed versions of low frequency portions of spectrograms. Dynamic programming is used to find the ''best" pitch track among all …

Recurrent Neural Networks And Algorithms For Reconstruction Of Images From Noisy And/Or Partial Data, Ming-Jung Seow

Electrical & Computer Engineering Theses & Dissertations

In this thesis, modular architectures and neighborhood-distance based learning algorithms for fast and effective convergence with increased storage capacity of Hopfield neural networks are presented. The main objective of this research work is to better understand the function of recurrent neural networks and the influence of modularity within a network, and to design, implement, and test the performance of modular Hopfield neural networks for pattern association. Mathematical analysis and results are provided to show that the speed, storage capacity, and generalization capability of the recurrent networks are improved significantly by incorporating the modular architectures and learning algorithms. A new ratio …

Phase-Sensitive Detection Electronics For Wavelength Modulation Spectroscopy Experiments, Tyrone Pate

Electrical & Computer Engineering Theses & Dissertations

Wavelength modulation spectroscopy (WMS) is a non-intrusive detection technique, which enables the measurement of several parameters such as pressure, concentration, and temperature of a species of interest by analyzing the latter's absorption lineshape profile. The method employs a synchronous modulation and detection apparatus to increase the signal to noise ratio and hence the sensitivity of the measurement. Phase-sensitive detection and demodulation of the signal is performed at the modulation frequency and its harmonics. Research at ODU demonstrates that each particular measurement can be performed optimally at an appropriate harmonic of the modulation frequency. The most suitable harmonic depends on many …

The Effects Of Communication Modality On Teamwork Processes, Thomas D. Fletcher

Psychology Theses & Dissertations

Since the onset of the digital age, organizations have been able to make use of teams of individuals distributed geographically to remain competitive. While strides have been made to understand the effectiveness of collocated teams, research has yet to sufficiently explore the effects of emerging technologies on team processes and effectiveness. A laboratory study, where dyads were asked to create a spreadsheet by following a set of explicit instructions (i.e., a psychomotor task), was conducted to manipulate the communication modalities most commonly used between collaborators (i.e., face-to-face vs. audio) and compare the effects of adding a shared workspace application. The …

Snapped Into The Sun, Marissa R. Bailey

English Theses & Dissertations

This collection of six short stories examines the lives of characters who have been betrayed or abandoned by family, friends, or lovers. These are stories of characters stuck in patterns of behavior who often use fantasy to cope with or skew their reality. However, these stories also demonstrate the triumph of breaking these patterns, of moving on, letting go, and persevering in spite of hurt and disappointment.

Object-Oriented Architecture For Concurrent Processes In A Port Simulation, Reejo Mathew

Electrical & Computer Engineering Theses & Dissertations

An architectural model to represent the resources and infrastructure within a cargo terminal, as well as to support the concurrent but opposite flow of cargo within the terminal, is presented in this thesis. The model supports the configuration of an individual cargo terminal according to its characteristics, as well as the processing involved in the simultaneous flow of cargo in opposite directions through the terminal. This is useful in the analysis of the flow of military cargo and aids the decision-making process to increase the efficiency and throughput of any military operation. This model has been developed with the aim …

The State Of The Region: Hampton Roads 2002, James V. Koch, Vinod Agarwal, John R. Broderick, Rev. Dr. James Cobb, Chris Colburn, Ellie Costulis, Steve Daniel, Tatiana Isakovski, Sharon Lomax, Trish Manthey, Deborah Miller, Gilbert Yochum, Grace Wu

Economics Faculty Books

This is Old Dominion University's third annual "State of the Region" report.While it represents the work of many individuals connected in various ways to the university, the report does not constitute an official viewpoint of the University, or it's president, Dr. Roseann Runte.

Our "State of the Region" reports maintain the modest goal of making Hampton Roads an even better place to live. We are proud of our region's many successes, but realize that it is possible to improve the region's performance. Yet, in order to improve our performance, we must have accurate information about "where we are" and a …

Academic Achievement Of College Underclassmen As A Function Of Student Ethnicity And Parenting Style, Meghan Marie Sabin

Psychology Theses & Dissertations

One hundred and fifty-seven (N = 157) undergraduate students rated their mothers' and fathers' parenting styles (i.e., authoritarian, authoritative, and permissive parenting). Information on GPA, ethnicity, and socioeconomic status (SES) was also obtained. Based on the literature, it was hypothesized that African American students from lower SES backgrounds would report lower GPAs than White college students from higher or lower SES backgrounds. Second, it was hypothesized that White and African American students from lower SES backgrounds would report lower GPAs. Third, it was hypothesized that African American students would report lower GPAs than White students. It was also hypothesized that …

Predicting Team Performance Over Time: A Secondary Data Analysis, Hope S. Hanner

Psychology Theses & Dissertations

Teams occupy a strong presence in the modern workplace. However, few studies have tracked the evolution of team behavior over time. The use of cross-sectional team research fails to appreciate the stages that teams pass through as they evolve and mature. The present study had three goals in mind. The first goal was to arrive at a causal model of team performance via a secondary statistical analysis on the research conducted by Cunningham (2001) and Strobel (2001). Strobe1 and Cunningham tracked the performance of eleven student-learning teams over the course of a semester. A team training intervention was administered after …

Approaching High Fidelity Human Tracking And Representation In Interactive Virtual Environments, Taimur K. Khan

Electrical & Computer Engineering Theses & Dissertations

This thesis revolves around an Office of Naval Research (ONR) grant known as Virtual Environments for Training (VET). The primary goal is to determine the effectiveness of an immersive environment for training; the secondary goal is to compare the results of this study to a similar study conducted in an environment that is less immersive.

Effectiveness will be determined by the performance of trainees manning a virtual military checkpoint. A four-wall immersive environment employing cave technology will be compared to a three dimensional desktop version of the scenarios employed in the more immersive environment. In order to make this comparison, …

A Multilevel Neural Network Architecture For Digital Implementation Of A Face Recognition System Based On Eigenface Approach, Linda Rajan

Electrical & Computer Engineering Theses & Dissertations

The design and development of the digital implementation of a multilevel feed forward neural network architecture for face recognition based on statistical features representing Eigenfaces is presented in this thesis. The architecture is divided into three parts: feature extractor, classifier and identifier, The Eigenface extractor architecture is developed based on an efficient design strategy in which all the M weight values corresponding to the Eigenfaces are generated simultaneously from M images representing the Eigen vectors and the test input image. The multilayer neural network classifier is trained using error backpropagation algorithm. A novel multilevel digital architecture is developed for the …

Abstracts Of Papers, 80th Annual Meeting Of The Virginia Academy Of Science, May 22-24, 2002, Hampton University, Hampton, Virginia

Virginia Journal of Science

Abstracts of papers that were presented at the 80th annual meeting of the Virginia Academy of Science.

Virginia Junior Academy Of Science Awards

Virginia Journal of Science

The award and grant winners for the Virginia Junior Academy of Science awards are listed.

Development Of An Efficient Ti:Sapphire Laser Transmitter For Atmospheric Ozone Lidar Measurements, Khaled A. Elsayed

Electrical & Computer Engineering Theses & Dissertations

The impetus of this work was to develop an all solid-state Ti:sapphire laser transmitter to replace the current dye lasers that could provide a potentially compact, robust, and highly reliable laser transmitter for differential absorption lidar measurements of atmospheric ozone. Two compact, high-energy pulsed, and injection-seeded Ti:sapphire lasers operating at a pulse repetition frequency of 30 Hz and wavelengths of 867 nm and 900 nm, with M² of 1.3, have been experimentally demonstrated and compared to model results. The Ti:sapphire lasers have shown the required output beam quality at maximum output pulse energy, 115 mJ at 867 nm and …

Investigation Of Port Fuel Injector Spray Mass Distribution By Laser Induced Fluorescence, Tuba Bayraktar

Mechanical & Aerospace Engineering Theses & Dissertations

Modern internal combustion engines have stringent requirements for performance and reduced toxic emissions. The fuel delivery system, and particularly the fuel injectors, have a vital role in reducing unburned hydrocarbons (HC) and carbon monoxide (CO) in exhaust emission.

The main goal of this study is to map the spatial and temporal distribution of the spray from a low-pressure gasoline fuel injector. To attain this goal, three tasks were performed: (1) the experimental investigation of the spray oscillation as functions of operating pressure and injector timing, (2) the determination of the appropriate dye/fuel combinations for one particular experimental technique, and (3) …

Circulation, Vol. 9, No. 1, Center For Coastal Physical Oceanography, Old Dominion University, Richard Moody

CCPO Circulation

Summer 2002 issue of CCPO Circulation featuring article "Workshop Promotes Safe Navigation, Training for Marine Pilots" by Richard Moody

Analysis Of Error Recovery Effects On Digital Flight Control Systems, Arturo Tejada Ruiz

Electrical & Computer Engineering Theses & Dissertations

Life-critical, real-time applications like flight-by-wire aircraft, rely on closed-loop digital control systems and fault-tolerant computer systems to reliably achieve the desired operation. The computer systems, however, may be affected by random hardware/software faults induced mainly by environmental conditions such as high intensity radiated fields (HIRF) and lightning. These harsh electromagnetic environments are known to induce common­ mode faults (CMF) in aircraft electronic systems, which disrupt fault-tolerant provisions and possibly affect the operation of the digital control system. Current flight-by-wire aircraft have computer systems that can neither detect CMF nor recover from them. New systems are under investigation that can recover …

In The Shadow Of The Fleet: The Development Of American Submarines Between The World Wars, Stephen J. Brady

History Theses & Dissertations

At the close of the First World War, American submarines compared most unfavorably with those of Germany and Great Britain. German submarines sank over 5000 ships, while the British submarine campaign, much less ambitious by design, was still credited with sinking 54 warships and 274 other vessels. Standing in stark contrast, American submarines did not sink a single ship. However, by the end of the Second World War, American submarines would sink over 1300 Japanese merchantmen and warships. This ultimate success was hard won, for attempts to modernize American submarine designs between the wars were continually stifled by advocates of …

Relationship Between Behavioral Measures In A Driving Simulator And Eeg Activity On Day-Shift And Night-Shift Workers, Jennifer L. Freeman

Psychology Theses & Dissertations

Driver fatigue is a concern that demands a closer investigation into ways of detection and populations at risk. This study examined the relationship between EEG activity and several driving behaviors, as well as differences between day-shift and nightshift workers. Twenty adults, five males and ten females between the ages of 18 and 45, participated in this experiment. Participants included 10 day-shift and 10 night-shift workers. Participants were wired for EEG recording and asked to drive in a 1-hour highway-driving scenario in a driving simulator. Relative powers of alpha, theta and beta were recorded and an EEG index of alertness was …

Reflection-High Energy Electron Diffraction Study Of Si(100) Homoepitaxy By Femtosecond Pulsed Laser Deposition, Mohammed S. Hegazy

Electrical & Computer Engineering Theses & Dissertations

The dynamics of femtosecond pulsed laser deposition (fsPLD) of Si(!00)-1 x I and Si(!00)-2x I homoepitaxy are studied by in situ reflection high-energy electron diffraction (RHEED) and ex situ atomic force microscopy (AFM). The effects of substrate temperature, laser fluence and the pressure of a passive gas on the Si(!00)-1 x I growth mode are discussed. It is shown that films grow following the Volmer-Weber (3D) growth mode. The substrate temperature largely affects the morphology of the grown film. Below ~ 400 °C (at laser fluence of~ 1.9 J/cm²), randomly oriented 3D clusters are grown. This is shown …

Stress-Counter Response Training: Flight Simulation Ans Biofeedback, Debra K. Stewart

Psychology Theses & Dissertations

Many attempts to reduce Human Error (HE) in aviation have been applied in the past. However, HE remains the largest reported cause of accidents and incidents in aviation. The present study was designed to implement a novel training method to produce voluntary control over the autonomic nervous system (ANS). Twenty-one participants flew a PC based F-16 flight simulator. There were three conditions: 1. Stress-Counter Response training (SCR), 2, traditional biofeedback training, and 3. A control. It was hypothesized that the SCR training group would show improved physiological control, better flight performance, and lower subjective workload ratings compared to the other …

Facility Administrator Perceptions Of The External Environmental Constituencies Shaping Urban Advanced Technology Centers, Daniel Robert Smith

Theses and Dissertations in Urban Services - Urban Education

The purpose of this study was to develop a list of the most relevant external environmental constituencies and responses to those elements that should be used by facility administrators of urban advanced technology centers. A three-round Delphi research method was conducted to garner the perceptions of the panel participants. The President's Advisory Council and the Board of Directors of the National Coalition of Advanced Technology Centers were asked to nominate facility administrators of urban advanced technology centers to serve as expert panel participants. Of the 17 facility administrators nominated, nine agreed to participate and completed all three rounds of the …

Hegel, Nietzsche, And The Postmodern Teleological Impasse, Michael P. Tarpey

Institute for the Humanities Theses

Our postmodern intellectual climate is characterized by two apparently contradictory impulses. One seeks to undermine, unmask, and deflate the pretenses of philosophy as traditionally conceived. The result is a focus on difference, surfaces, and fragmentation. The competing impulse seeks to reconcile, integrate, and synthesize. The result is a holistic focus on deeper similarities behind surface differences. I argue that these competing impulses can be traced back to Hegel and Nietzsche. Thus, an understanding of the relationship between these two thinkers can illuminate our current postmodern condition. I argue that Nietzsche and Hegel are remarkably similar in their approach to many …

Excimer Emission From Pulsed Microhollow Cathode Discharges, Mohamed Moselhy

Electrical & Computer Engineering Theses & Dissertations

Microhollow cathode discharges (MHCDs) are direct current, high-pressure, non-equilibrium gas discharges. Direct current MHCDs in xenon and argon have shown to emit excimer radiation at 172 and 127 nm, respectively. Internal efficiency of excimer emission in DC MHCD was measured to be 6–9% in xenon, and 1–6%, depending on the gas flow rate in argon. This high efficiency is due to the high rate of rare gas excitation by electrons accelerated in the cathode fall and to subsequent three-body collisions in the high-pressure gas. The excimer power scales linearly with current; however, due to the increasing size of the source …

Aligning Hierarchical Goals In An Organization: The Path From Training To Performance, Jeanette Denise Selby-Lucas

Engineering Management & Systems Engineering Theses & Dissertations

Training is a multi-billion-dollar industry, and with the advent of the training technology revolution and the possibilities it provides to business and government, as well as to the academic community, it is important to determine if the money invested in training by these communities is providing the expected performance on the part of those who are trained. This can be done by quantitatively evaluating the relationship between training and performance.

This study extends the scholarly literature by developing the concept of organizational alignment through a combination of Human Performance Technology literature and traditional engineering methodologies. Organizational training and performance is …

Study Of Non-Equilibrium Electron Dynamics In Metals, Wael Mohamed Gomaa Ibrahim

Electrical & Computer Engineering Theses & Dissertations

Thermal phenomena, such as heat propagation, lattice melting, and ablation, are the result of energy deposition in metals. A fundamental understanding of the electron dynamics leading to these thermal phenomena would benefit many laser applications, such as laser deposition of thin films and laser processing.

In this work, thin metal films were prepared using the resistive heating evaporation technique. High dynamic range autocorrelators were constructed to characterize the different laser systems used in this study. The nonequilibrium electron dynamics in single layer gold films, multi-layer gold-vanadium, and gold-titanium films were studied. The time evolution of the electron temperature was monitored …

A Conceptual Design Tool For Engineers: An Amalgamation Of Theory Of Constraints, Theory Of Inventive Problem Solving And Logic, Stephen R. Luke

Mechanical & Aerospace Engineering Theses & Dissertations

This research creates a design methodology by synthesizing three different design tools, the Theory of Inventive Problem Solving (TRIZ), the Theory of Constraints (TOC) and Logic. The basic approach of this design method is to: (1) Reduce a design problem to a logic diagram, (2) Code the inputs and outputs to determine desirability and degree of control, (3) Identify the best inputs to manipulate in order to obtain the desired outputs and (4) Exploit innovative algorithms developed in TRIZ to find the best ways to manipulate the chosen inputs.

This research integrates and expands the methods of TRIZ and TOC. …

Effect Of Electrically Mediated Intratumor And Intramuscular Delivery Of A Plasmid Encoding Ifn Α On Visible B16 Mouse Melanomas, Loree C. Heller, Stephanie F. Ingram, M. Lee Lucas, Richard A. Gilbert, Richard Heller

Bioelectrics Publications

Interferon α may be used as a single agent therapy for metastatic malignant melanoma or as an adjuvant to chemotherapy. Delivery of interferon α by gene therapy offers an alternative to recombinant protein therapy. Electrically mediated delivery enhances plasmid expression in a number of tissues, for instance skin, liver, muscle and tumors including melanomas. Here we compare the effect of delivery of a plasmid encoding mouse interferon α on growth of visible B16 mouse melanomas following electrically mediated delivery to muscle or directly to the tumor. Intratumoral delivery of interferon α plasmid not only slows melanoma growth, but induces complete, …

Cuin1-Xalxse2 Thin Films And Solar Cells, P. D. Paulson, M. W. Haimbodi, S. Marsillac, R. W. Birkmire, W. N. Shafarman

Electrical & Computer Engineering Faculty Publications

CuIn[sub 1-x]Al[sub x]Se[sub 2] thin films are investigated for their application as the absorber layer material for high efficiency solar cells. Single-phase CuIn[sub 1-x]Al[sub x]Se[sub 2] films were deposited by four source elemental evaporation with a composition range of 0≤x≤0.6. All these films demonstrate a normalized subband gap transmission >85% with 2 µm film thickness. Band gaps obtained from spectroscopic ellipsometry show an increase with the Al content in the CuIn[sub 1-x]Al[sub x]Se[sub 2] film with a bowing parameter of 0.62. The structural properties investigated using x-ray diffraction measurements show a decrease in lattice spacing as the Al content increases. …