Digital Commons Network^™

Parameter Estimation Of The Mixed Generalized Gamma Distribution Using Maximum Likelihood Estimation And Minimum Distance Estimation, Dean G. Boerrigter

Theses and Dissertations

The Generalized Gamma is an extremely flexible distribution that is useful for reliability modeling. Among its many special cases are the Weibull and Exponential distributions. A mixture of Generalized Gamma Distributions is even more useful because multiple causes of failure can he simultaneously modeled. This research studied parameter estimation of the special cases of the Mixed Generalized Gamma Distribution and built upon them until the full nine-parameter distribution was being estimated. First, special cases of a single Generalized Gamma Distribution were estimated. Next, mixtures of Exponential distributions with both known and unknown location parameters were estimated. Next, mixtures of Weibull …

Calculating A Value For Dominant Battlespace Awareness, Eric A. Beene

Theses and Dissertations

In times of ever-tightening military budgets, methodologies are required that can compare the contributions of various systems involved in the warfighting process. While many tools are in use that directly measure the effects of greater numbers of enhanced hardware, and even improved processes, no validated methodology exists to measure elements that contribute to Command, Control, Communications, and Computers (C4); Intelligence, Surveillance, and Reconnaissance (ISR); or to analytically compare these elements with more traditional hardware. This thesis develops a methodology for mathematically quantifying awareness in a military command and control (C2) environment. This methodology begins with the Observe-Orient-Decide-Act Loop to show …

Sensitivity Analysis Of Brawler Pilot Skill Levels, Daniel C. Buschor

Theses and Dissertations

BRAWLER is a high resolution air to air combat simulation model used for engagement level analyses of few on few air combat. It uses a value driven decision logic to help simulate pilot behavior. In order to account for varied pilot skill levels, BRAWLER has defined three skill levels; Rookie, Pilot, and Ace. A Rookie can track up to three aircraft in its mental model, the Pilot, up to five aircraft, while an Ace has no limit. Further, each skill level varies the amount of time before a known aircraft, which has not been recently observed, is purged from the …

Performance Of Imaging Laser Radar In Rain And Fog, Kathleen M. Campbell

Theses and Dissertations

The Air Force is currently developing imaging laser radar systems (ladar) for use on precision guided munitions and other imaging systems. Scientists at Eglin Air Force Base, in conjunction with Wright Laboratories, are testing a 1.06-um wavelength ladar system and need to understand the weather effects on the ladar images. As the laser beam propagates through the atmosphere, fog droplets and raindrops can cause image degradation, and these image degradations are manifested as either dropouts or false returns. An analysis of the dropouts and false returns helped to quantify the performance of the system in adverse weather conditions. Statistical analysis …

Solving Geometric Knapsack Problems Using Tabu Search Heuristics, Christopher A. Chocolaad

Theses and Dissertations

An instance of the geometric knapsack problem occurs in air lift loading where a set of cargo must be chosen to pack in a given fleet of aircraft. This paper demonstrates a new heuristic to solve this problem in a reasonable amount of time with a higher quality solution then previously reported in literature. We also report a new tabu search heuristic to solve geometric knapsack problems.

A New Sequential Goodness Of Fit Test For The Three-Parameter Weibull Distribution With Known Shape Based On Skewness And Kurtosis, Jonathan C. Clough

Theses and Dissertations

The Weibull distribution finds wide applicability across a broad spectrum of disciplines and is very prevalent in reliability theory. Consequently, numerous statistical tests have been developed to determine whether sample data can be adequately modeled with this distribution. Unfortunately, the majority of these goodness-of-fit tests involve a substantial degree of computational complexity. The study presented here develops and evaluates a new sequential goodness-of-fit test for the three-parameter Weibull distribution with a known shape that delivers power comparable to popular procedures while dramatically reducing computational requirements. The new procedure consists of two distinct tests, using only the sample skewness and sample …

An Airlift Hub-And-Spoke Location-Routing Model With Time Windows: Case Study Of The Conus-To-Korea Airlift Problem, David W. Cox

Theses and Dissertations

Traditionally, the United States Air Force's Air Mobility Command (AMC) has used the concept of direct delivery to airlift cargo and passengers from a point of embarkation to a point of debarkation. This study develops an alternative hub-and-spoke combined location-routing integer linear programming prototype model, and uses this model to determine what advantages a hub-and-spoke system offers, and in which scenarios it is better-suited than the direct delivery method. Additionally, the analysis suggests that the C-17 may be better-suited, in certain airlift situations, for theater airlift versus strategic (direct delivery) airlift. The model features the following elements: time windows, cargo …

Azimuth And Range Optimization Of The Velocity Azimuth Display (Vad) Algorithm In The Wsr-88d, David L. Craft

Theses and Dissertations

The Velocity Azimuth Display (VAD) algorithm occasionally produces inaccurate wind estimates for the VAD Wind Profile (VWP) product of the Weather Surveillance Radar 1988 Doppler (WSR-88D) System. Weather forecasters have observed differences between the radar's wind profiles and wind profiles produced by rawinsondes and vertical wind profilers, when radiation and subsidence inversions in the atmosphere caused the radar beam to super refract. This thesis sought to improve the operational use of the VWP product for the WSR-88D near Denver, CO, by finding the optimal VAD algorithm Azimuth and Range parameter settings to overcome data contamination by hills located at the …

A Life Cycle Cost Model For Innovative Remediation Technologies, Osman S. Dereli

Theses and Dissertations

LCC analysis is a powerful tool for investigating the costs of competing systems. This thesis investigates the cost scaling methods to improve the traditional LCC modeling techniques. The motivation for this research is finding a good estimate for the remediation technologies when the contaminant volume is not exactly known. This specific case lead researcher to investigating the methods of cost scaling and effects of inflation in the cost estimation. As a result of study a generic LCC model is developed. Methods for considering inflation and scaling are recommended and embodied into the model. The developed model is applied the specific …

Methodology For The Analysis And Design Of Internet Software Components Providing Relational Database Access Through The World Wide Web, Daniel L. Dipiro

Theses and Dissertations

This work examines the application of Internet software technologies to provide access to remote relational databases via the World Wide Web. The research applies these software technologies to assist the Air Force Institute of Technology Civilian Institute Program in improving operations and student to staff communication. An analysis of the existing Internet software technologies revealed several competing technologies capable of performing the same database access functions. The analysis further revealed weaknesses and inconsistencies in the existing AFIT/CI database. A methodology is proposed to assist in analyzing an existing development environment and in selecting among the competing technologies to provide the …

Calibrated Probabilistic Quantitative Precipitation Forecasts Based On The Mrf Ensemble, Frederick Anthony Eckel

Theses and Dissertations

Probabilistic quantitative precipitation forecasts (PQPF) based on the medium range forecast (MRF) ensemble are currently in operational use below their full potential quality (i.e., accuracy and reliability). This unfulfilled potential is due to the MRF ensemble being adversely affected by systematic errors which arise from an imperfect model and less than ideal ensemble initial perturbations. This thesis sought to construct a calibration to account for these systematic errors and thus produce higher quality PQPF. Systematic errors were explored with the use of the verification rank histogram, which tracks the performance of the ensemble. The information in these histograms was then …

Generating Bomber Routes For The Delivery Of Gravity Weapons, Gregory J. Ehlers

Theses and Dissertations

United States Strategic Command (USSTRATCOM) is updating the Arsenal Exchange Model (AEM) that it uses for allocating strategic weapons to targets. AEM does not model the range constraints on bomber routes. These routes are used to deliver gravity munitions. In order to include these constraints in the new method, the Weapons Allocation Model (WAM), a pool of routes that satisfy the range constraints needs to be created. The number of possible routes to consider is extremely large and it is not possible to enumerate them all. Therefore, the method to form the pool of routes needs to reduce the number …

Channel-Mismatch Compensation In Speaker Identification Feature Selection And Adaptation With Artificial Neural Networks, Edmund A. Fitzgerald

Theses and Dissertations

We develop and present results of an artificial neural network (ANN) based compensation technique for mismatched classifier training and testing conditions in speaker identification (SID). One ANN per feature per speaker is trained to perform a mapping of that feature from a corrupted condition to an undistorted condition. Therefore, a classifier trained under one condition may be used to classify data collected under a different condition. Speech utterances from 168 speakers, collected in a studio, and also re-recorded after transmission over telephone networks, are used for developing and testing the method. Peak formant resonant frequencies, their bandwidths, and pitch are …

Effect Of High Free Stream Turbulence On Film Cooling Using Double Row Of 30° Slant-Hole Injectors, Lilith I. Sorensen

Theses and Dissertations

In this study free stream turbulence levels from 7.3% to 17.8% are applied to film cooling over a flat plate with two rows of 30° slant holes using a wall jet as the main stream air supply and source of turbulence. Blowing ratios are varied from 0.25 to 2.0 and free stream velocities at injection range from 10 m/s to 85 m/s. A constant density ratio of 1.07 is kept throughout the experiment. Results show that for different magnitudes of blowing ratio free stream turbulence has a different influence on effectiveness. At the forward stations, where blow off was present …

A Risk Analysis Of Remediation Technologies For A Doe Facility, Helene A. Wilson

Theses and Dissertations

The Department of Energy is responsible for selecting a remediation technology to clean up the Waste Area Group (WAG) 6 site at the Paducah Gaseous Diffusion Plant (PGDP) in Kentucky. WAG 6 is contaminated with an uncertain amount of trichloroethylene (TCE) and technetium-99 (Tc-99). Selecting a remediation technology involves a certain degree of risk because many of these technologies are new or proven only for a specific type of contaminant or a particular set of site conditions. Differences between contaminant type and site conditions are enough to make the performance of a remediation technology uncertain. This research identifies the technological …

Flight Test And Handling Qualities Analysis Of A Longitudinal Flight Control System Using Multiobjective Techniques, John R. Anderson

Theses and Dissertations

This thesis addresses the application of optimal, multiobjective control theory control theory to flight control design for the approach and landing phase of flight. Five flight control systems were designed using classical, H2, H infinity, and Mixed H2/H infinity methods. The MATLAB™ MUTOOLS™ and AFIT MXTOOLS toolboxes were used to produce the optimal, multiobjective designs. These designs were implemented for flight test on the Calspan VSS I Learjet, simulating the unstable longitudinal dynamics of an F-16 type aircraft. A limited handling qualities investigation was performed. Model following was used in the design phase to meet handling qualities specifications. The designs …

The Effects Of Harmonic Accompaniment On The Music Achievement, Aptitude, And Musical Effectiveness Of First Grade Children, Ruth Pelphrey

Theses and Dissertations

The purpose of this research was to determine how harmonic accompaniments affect first grade children. The specific problems of the study were to understand how harmonic accompaniments affect children in their 1) tonal development, 2) use of their voice, and 3) interest in singing. Furthermore, a fourth problem was to determine the relationships among interest in singing, use of singing voice, and tonal development.

One hundred and six first grade students in five classes were randomly selected to participate in this study. There were three treatment groups; one received song instruction with the accompaniment of piano/guitar, the second used CD …

The Relationships Among First Grade Students' Tonal Aptitude, Singing Vocal Development, And Developmental Age, Florence Tavani

Theses and Dissertations

The purpose of this study was to determine if there was a correlation between developmental age and scores achieved on music ability tests.

The problem of this study was to determine the relationships among the Primary Measure of Music Audiation and the Singing Voice Development Measure and the Gesell School Readiness Test.

Sixty-three students in grade one of the Indian Mills Elementary school took part in this study. All of these students had been tested with the Gesell School Readiness Test prior to entering first grade. This test consisted of eight subtests requiring such tasks as cube stacking, verbal …

Optimum Preventive Maintenance Policies For The Amraam Missile, Scott J. Ruflin

Theses and Dissertations

The overall objective of this research effort was to formulate a preventive maintenance strategy for AMRAAM missiles subject to extended captive carry flight time. A preventive maintenance policy is only applicable if the item in question is aging, or deteriorating with time. Therefore, a supporting objective of this research is to characterize the aging process of the missile system through a non-parametric analysis of its Mean Residual Life (MRL) function. Three non-parametric, censored-data MRL function estimation techniques discussed in the literature are examined via a numerical example. All three estimation techniques provide MRL functions that exhibit greatly exaggerated decreasing trends …

Internship In Supervision And Curriculum Development In The Millville Public Schools, Millville, New Jersey, 1996-1997, Debra G. Wenrick

Theses and Dissertations

The internship in Supervision and Curriculum Development provided the intern the opportunity to develop and strengthen leadership skills required for educational administrators for the 21st century.

The internship focused on the following projects: 1) the development of a balanced curriculum for the district's bilingual summer enrichment program, 2) the facilitation of a collegial sharing of ideas learned at out-of-district workshops, 3) the piloting of a teacher-centered revision of the district's evaluation system, 4) a teacher-led workshop to encourage the use of CD-ROM technology as an instructional tool and 5) the implementation of cross-age tutoring.

The following recommendations were made: 1) …

A Fund Raiser's Guide For Gaining Access To Corporate Givers, Patricia L. Pfleger

Theses and Dissertations

This project identified, through both primary and secondary research, techniques for local United Way organizations to effectively gain access to key executives at mid-size corporations. The secondary research found that the trend in corporate giving is to demand much more recognition for philanthropy. Many corporations are combining charitable donations with their marketing efforts to target present or future customers.

Primary research was conducted using mail questionnaires, which were sent to fund raisers and corporate givers, listing possible techniques for making contact with corporate givers. A list of recommended techniques for fund raisers to use was then compiled.

Recommendations for fund …

Quality Air Force Initiative As Related To The Practices Of Total Quality Management., Deanne Watrous Otto

Theses and Dissertations

Total Quality Management (TQM), a technique associated with business and manufacturing, was investigated in two areas: the Air National Guard and higher education. A survey was conducted by the 119th Fighter Wing (119th FW) of the North Dakota Air National Guard to measure the success of its Total Quality Initiative. This data was made available for an assessment regarding the use of TQM practices outlined by Deming's "14 Points of Top Management," which is also the basis for the federal government's TQM practices. Prior to any comparisons, an analysis of the questionnaire was done. A factor analysis (Alpha, with varimax …

A Novel Regulatory Mechanism Of Glycolysis Via Glycolytic Enzyme-Tubulin Interactions: Modulation By Protein-Tyrosine Kinase Phosphorylation Of Tubulin., K. Warren Volker

Theses and Dissertations

Glycolytic enzymes have been shown to bind to the cytoskeletal protein, tubulin. These protein-protein interactions have been hypothesized to provide compartmentation of glycolysis in the cytoplasm of eukaryotic cells via the cytoskeleton, a component of the microtrabecular lattice.Previously, in my thesis work, it was determined that four enzymes of glycolysis (glyceraldehyde-3-phosphate dehydrogenase, aldolase, pyruvate kinase, and lactate dehydrogenase-muscle type) had high affinity for the $\alpha$-subunit C-terminal region of tubulin. When this region was removed proteolytically, binding was diminished. The localization of the glycolytic enzyme domain on tubulin, phosphorylation of this domain, and in vivo effects of the domain are investigated …

Synthesis Of Group 4 Metallocenes., Qing Yang

Theses and Dissertations

This dissertation is divided into four subjects. They are: (1) the improved synthesis of known group 4 metallocenes; (2) the synthesis of new group 4 metallocenes; (3) the synthesis of new geminal diindenes, potential ligands for highly reactive polyolefin catalysts, and the improved synthesis of a known ligand precursor; and (4) the application of group 4 metallocenes in C-H activation.Rac-EBIZrCl$\sb2$ is prepared in 66% isolated yield via a non-aqueous, non-acidic workup. Additionally, the preparation of ligand precursor 1,2-(3-indenyl)ethane is significantly improved by inverse addition of indenyl anion to 1,2-dibromoethane. (THI)$\rm\sb2TiCl\sb2,$(THI)$\rm\sb2ZrCl\sb2,$ and previously unreported (THI)$\rm\sb2HfCl\sb2$ are prepared in 69%, 67%, and …

Capture Of Alkali During Pressurized Fluidized-Bed Combustion Using In-Bed Sorbents., Michael David Mann

Theses and Dissertations

Pressurized fluidized bed combustion (PFBC) offers the ability to reach high system efficiencies while controlling both SO$\sb2$ and NO$\rm\sb {x}$ emissions. However, current technology does not allow the capture of alkali to the recommended level of 24 ppb set by turbine manufacturers. Aluminosilicate minerals have the potential to capture alkali, especially sodium and potassium, under conditions typical of the fluid bed (750 to 1000$\sp\circ$C). When alkalis and alkaline-earth elements react with aluminosilicate minerals, phases have been observed which result in the formation of sodalites, such as hauyne and nosean, that have cubo-octahedral structure capable of incorporating sulfate and chlorine anions.Thermal …

Mormon Culture Meets Popular Fiction: Susa Young Gates And The Cultural Work Of Home Literature, Lisa Olsen Tait

Theses and Dissertations

The few studies of Mormon home literature that have been published to date dismiss it as inferior artistry, an embarrassing if necessary step in the progression towards true Mormon literature. These studies are inadequate, however, because they divorce the texts from their context, holding them up to standards that did not exist for their original audience. Jane Tompkins' theory of texts as cultural work provides a more satisfactory way of looking at these narratives.

Home literature is thoroughly enmeshed in the cultural discourse of its day. Beneath the surface, these didactic stories about young Mormons finding love with their foreordained …

Oral Performances As Ritual: Animating The Invisible In Mormon Women's Miscarriage Stories, Kristin Leifson Ballif

Theses and Dissertations

This thesis is comprised of ten Mormon women's miscarriage stories and it is their stories that are used as the text for my analysis. The purpose of the study is to provide a space for these women to share their experiences and to reveal their cultural values and beliefs. Because the women are all Mormon, there are some distinctive cultural and religious values that are shared within their stories and it is these aspects that are analyzed and discussed within the text.

Women need to be able to share their miscarriage stories so as to alleviate feelings of isolation and …

Learning To Learn: The Training Of Missionaries In Language Learning Strategies At The Missionary Training Center, D. Brian Kohler

Theses and Dissertations

Language learning strategies (LLS) are specific actions, behaviors, steps, or techniques that learners use to improve their rate and level of L2 development. This thesis details the development and validation of a LLS training program designed to measure if training in LLS increases LDS missionaries' awareness of LLS as potential language learning tools. Specifically, it explores the question as to whether missionaries trained in LLS use and intend to use LLS more frequently, more appropriately, and with a greater range than those not trained in LLS.

The development of the LLS training program involved selecting a set of 48 specific …

Chemical Synthesis, Bacterial Expression, And Characterization Of Pro-Gnrh/Gap, A Precursor Protein Of Two Biologically Active Peptide Hormones, Louis E. Mcadory

Theses and Dissertations

Two biologically active peptides, gonadotropin releasing hormone (GnRH) and GnRH associated peptide (GAP) are both derived from a common prohormone precursor protein, pro-GnRH/GAP. Both peptides are cosecreted from hypothalamic neurosecretory granules and are involved in the regulation of mammalian reproduction. A calcium dependent, neutral pH serine protease discovered in this laboratory, GAP-releasing enzyme, is the most likely processing enzyme of pro-GnRH/GAP. GAP-releasing enzyme is immunologically related to PC1/3, a member of the prohormone convertase (PC) class of processing endoproteinases.

GAP-releasing enzyme recognizes the eight residue processing site within pro-GnRH/GAP, G⁶LRPGGKR¹³, and correctly cleaves the R^{13 …}

Female Medical Residents And Stress: Origins, Impacts, And Coping Responses, Brenda Mcgehee Smith

Theses and Dissertations

Stress research studies of medical residents in the 1970s and 1980s found that female residents cope less well than male residents. Coping strategies, as well as origins and impact of stress, of 12 female residents were examined in the contexts of their environment. This qualitative ethnographic study was organized around the transactional cognitive theory of stress and coping. Female residents coped well, with use of a variety of strong support relationships, and were creative and flexible in combining their personal and professional lives. The quality of interpersonal communication and support, rather than the existence, appeared to have the greatest effect …