Digital Commons Network^™

Measuring Productive Efficiency In Air Force Operational Contracting Squadrons: An Application Of Data Envelopment Analysis, Dennis W. Groseclose, Douglas E. James

Theses and Dissertations

In an effort to improve the management feedback in operational contracting squadrons, this research concentrated on the development of an alternate method to measure operational contracting performance. Specifically, the research investigated the use of Data Envelopment Analysis (DEA) to measure the productive efficiency of 45 operational contracting squadrons. Operational contracting managers were surveyed to identify critical resources to and outputs from the contracting process. Based on this survey, four inputs and five outputs were included in the DEA model. The DEA was executed for each contracting squadron under study. The DEA output provided improved performance measurement and feedback information. DEA …

Computerized Vehicle Routing Programs And Their Effect On Vehicle Utilization In The Air Force, Rex E. Adee, William G. Howard

Theses and Dissertations

The purpose of this study is to determine if a commercial computerized vehicle routing program improves vehicle utilization for an Air Force base transportation organization. First, the researchers investigate current routing procedures of Air Force base transportation organizations. Second, researchers identify a commercial computerized vehicle routing program that enables the authors to conduct a comparison of vehicle utilization rates between an Air Force base transportation organization and commercial computerized vehicle routing programs. The study reveals that implementing a computerized vehicle routing program in place of a manual routing procedure does not improve vehicle utilization. However, the study reveals some limitations …

Quality-Based Supply Management Indicators, Michael O. Cannon, Brian B. Yoo

Theses and Dissertations

The purpose of this thesis was to determine if current supply management indicators provide supply managers with quality measurement tools. This research developed the Quality-Based Metrics Framework, consisting of customer focus and continuous process improvement with underlying supporting elements of time and cost. A literature review determined an appropriate framework for improving logistics indicators. Interviews with supply analysts and a review of pertinent publications identified the most commonly used supply management indicators. A focus group of highly experienced senior supply officers determined the usefulness of currently used indicators in terms of the framework. Using the input from the focus group, …

An Investigation Of Alternative Metamodels For The Theater Simulation Of Airbase Resources Model, Alistair G. Dally

Theses and Dissertations

This study is an exploratory investigation into the development of metamodels of a particular Theater Simulation of Airbase Resources (TSAR) simulation model. Techniques applicable to the development of metamodels from a simulation using an orthogonal two-level fractional factorial experimental design are discussed. The experimental design is found to limit the metamodel form to polynomial linear least squares regression models, and also to greatly simplify the process of building regression models. Using the simulation results from previous research, alternate metamodels are proposed for both the prediction of sorties generated by the airbase system, as modeled by the simulation; and to assist …

An Evaluation Of Aircraft Maintenance Performance Factors In The Objective Wing, Mark A. Gray, Margaret M. Ranalli

Theses and Dissertations

Prior to 1992, organizational maintenance was aligned under a - separate maintenance organization. In 1992, the Air Force restructured into Objective Wings with organizational maintenance aligned under the flying squadrons. This study looks at the impact of this reorganization on maintenance performance factors. The researchers developed maintenance performance models using regression and principal component analysis. Mission Capable Rate and Total Not Mission Capable Maintenance Rate are used as dependent variables. A comparison of key maintenance performance indicators and model predictions before and after the reorganization is accomplished. Based on the results of this analysis, the researchers conclude that there is …

The Effect Of Fill Patterns On Graphical Interpretation And Decision Making, Robert D. Helgeson, Robert A. Moriarty

Theses and Dissertations

This study investigated if decision makers could be mislead by computer generated vertical bar graphs that contained varying intensities of fill patterns. It also investigated if the misleading influence of vertical bar graphs caused any differences in interpretation or decision making. A literature review revealed a need to test bar graphs with varying intensities of fill patterns in a controlled environment. By creating vertical bar graphs that use fill patterns, stronger impressions may be produced on the decision maker which may lead to misinterpretations of the underlying data. An experiment was conducted on 182 mid to upper level Department of …

An Analysis Of Career Progression Rates Of Civilian Graduates Of The Air Force Institute Of Technology, Helena R. Hughley, Gene E. Massman

Theses and Dissertations

This study analyzes the career progression rates of civilian graduates from the School of Logistics and Acquisition Management of the Air Force Institute of Technology (AFIT). The sample includes all civilian AFIT graduates who are currently working for the Air Force Materiel Command (AFMC). Actual promotion rates of the AFIT graduates are compared to promotion rates for two comparison groups: AFMC civilians with a master's degree from a civilian institution; and AFMC civilians with a bachelor's degree but no graduate degree. A regression analysis is performed to study the relationship between specific factors and a graduate's future rate of promotion. …

Computer Simulation Study Of The Joint Deployment Of The 23rd Wing And 82nd Airborne Division From Pope Air Force Base, John B. Prechtel, Mark S. Wingreen

Theses and Dissertations

This thesis produced a model of the Army airdrop segment of the Pope AFB deployment system. The original intent was to model the entire system and simulate the simultaneous deployment of the 23rd Wing and 82nd Airborne Division; however, time constraints and incomplete data forced a reduction in scope. The study provides an excellent foundation for further research into the use of simulation to develop a generalized deployment sizing model. The airdrop segment of the system was modeled using the researcher's personal observations of the system, the expertise of personnel who work within the system, and documentation of the problems …

A Comparison Of The Disaster™ Scheduling Software With A Simultaneous Scheduling Algorithm For Minimizing Maximum Tardiness In Job Shops, Barak J. Carlson, Christopher A. Lettiere

Theses and Dissertations

The Theory of Constraints (TOC) is the foundation for a computerized scheduling system called DISASTER. Although this system has proven successful in many manufacturing settings, it has potential limitations due to the sequential heuristic process by which it schedules constraints. The objective of this thesis was to determine the extent to which these limitations impact the due date performance of schedules created by DISASTER. This objective was addressed by developing an algorithm to simultaneously schedule multiple constraints in a job shop environment and provide the optimal schedule for minimized maximum tardiness. This algorithm was used to obtain solutions for a …

A Study Of The Establishment Of Cost And Schedule Variance Thresholds On Department Of Defense Major Program Contracts, Tuan A. Hoang, Steven M. Quick

Theses and Dissertations

This thesis examined to what extent theoretical threshold models are used to establish cost and schedule variance thresholds on Department of Defense (DoD) major program contracts and identified how these thresholds are actually established. First, numerous theoretical methods for establishing variance threshold including the accounting approach, the statistical process control approach, and the Dyckman and Kaplan models were investigated and assessed. Interviews were then conducted with a sample of DoD and civilian defense contractor personnel who had first-hand knowledge of the establishment of cost and schedule variance thresholds. Findings indicated that none of these methods was being used. Repeatedly, interviewees …

A Study Of The Development Of Planning, Programming And Budgeting System (Ppbs) In The United States Department Of Defense, Sakir S. Kantik

Theses and Dissertations

Having served as the United States Defense Department (DoD)'s primary resource allocation and decision-making process for more than 30 years, Planning-Programming-Budgeting System (PPBS) has kept going its evolution since it was first introduced in 1961. Accordingly, this study examined the development of PPBS in the U.S. DoD from its beginning to the recent past, that is to 1986, focusing on its basic purposes, how it has been modified and to assess the various expert observations made about the system. As originally conceived, the budget process was divided into three phases: Planning, Programming and Budgeting. The Planning phase was concerned with …

Implementation Of The Defense Business Operations Fund (Dbof) Policies And Unit Costing In The Air Force Institute Of Technology (Afit), Charles W. Leonard, Rafeal Martinez

Theses and Dissertations

This study examined the potential effects of the Defense Business Operations Fund (DBOF) policies on the graduate degree programs at the Air Force Institute of Technology (AFIT). The study examined the Defense Management Review document that provides the implementation and guidance information for DBOF, and Unit Cost. DBOF requires that organizations provide unit cost per output figures as the basis for organizational funding. Unit cost resourcing is expected to change the way federal managers control resources, and is intended to promote quality management practices. In order to achieve the research objective, the researchers surveyed the opinions of HQ AFMC's Graduate …

Scheduling A Medium-Sized Manufacturing Shop: A Simulation Study, Daniel J. Mcfeely

Theses and Dissertations

This study examined the application of simple-to-use, low cost scheduling methods to the operating environment of a medium-sized manufacturing shop. Computer simulation was used to evaluate eighteen different scheduling algorithms, each the result of the combination of a loading and a sequencing rule; due date setting was not considered since due dates are exogenously set. The loading rules investigated were Minimum Machine Required, Lowest Average WIP, and Lowest Average Aggregate Priority Level. The sequencing rules investigated were Priority, EDD, FIS, SPT, Slack, and Slack Ratio. The scheduling algorithms were evaluated against performance measures of mean tardiness, mean flowtime, mean percentage …

An Analysis Of The Performance-Risk Trade-Off In Source Selection Decision Making, Richard G. Pierce, Jeffrey E. Wainwright

Theses and Dissertations

Each year the Air Force awards weapon system contracts worth billions of dollars using the source selection process. In the source selection, performance and risk assessments are evaluated to determine the best proposal; the proposal that gives the best overall value. The purpose of this research was to investigate the performance/risk trade-off in the source selection decision making process. The study also examined the effect individual risk propensities and the nature of item being evaluated have on the performance/risk trade-off decisions. Air Force acquisition personnel stationed at Aeronautical Systems Center, Wright-Patterson AFB, OH, who had participated in a source selection …

The Representation Of Female Authors And Male Minority Authors In Selected Secondary School American Literature Anthologies Between 1958 And 1993, Julee Ann Hauff Russell

Theses and Dissertations

Although elementary and secondary school textbooks from many subject areas have been studied with regard to issues of gender and ethnic equity, no substantive studies have been conducted which examine the diversity of authors included in American liter3 5ure anthologies commonly used in high schools at the eleventh grade level. This study examined 17 selected American literature anthologies published by nine companies between 1958 and 1993 in terms of their representation/ inclusion of selections by female authors and male minority authors during this 35-year period. Anthologies from the following publishing companies were included: Harcourt, Brace, & World; Scott, Foresman; L. …

Integrative Learning From The Student Perspective: A Case Study, Ann Lee Miller Asbeck

Theses and Dissertations

This paper considers the educational concept of integration as it applies to curriculum design and implementation and to the relationship between curriculum integration and integrative experiences of student participants. Three assumptions underlie the study: (a) Integration is a goal of a program called Integrated Studies, (b) the meaning of integration must be defined within the context of a program, and (c) integration in Teaching & Learning is more than a structure designed by a faculty. The Integrated Studies Program at the University of North Dakota, by its own description, seeks to provide a more coherent learning experience for students within …

An Investigation Of The Reliability And Validity Of The Enderle-Severson Transition Rating Scale, Susan J. Severson

Theses and Dissertations

The purpose of this study was to identify the technical characteristics of the Enderle-Severson Transition Rating Scale (ESTR; Enderle & Severson, 1991) and to add to the knowledge base about measurement in transition. Validity ;was examined by evaluating the scale's concurrent criterion-related validity, construct validity, and content validity. A measure of reliability was performed by examining the internal consistency of subscales and the entire scale.

The samples studied were special education teachers in North Dakota and Minnesota as well as the students they served. The student subjects had identified disabilities of learning disability, emotional disturbance, or mental retardation. All students …

Student Generated Mathematical Story Problems, Alice J. Sarzowski

Theses and Dissertations

No abstract provided.

A Study To Ascertain The Influence Of A Technological Problem Solving Course On Student Career And Education Goals, Wayne D. Lang

Theses and Dissertations

The problem in this study was to determine the effect that completion of a high-school-level technological problem solving course had on students' future educational and career choices.

An ex post facto, descriptive-analytical design was used to measure the influence of past course content. A survey instrument was distributed to collect both demographic data and Likert-scale data relating to the influence of the topics and activities of an Introduction to Engineering course.

The population of the survey included the 95 students who completed the Introduction to Engineering course between 1986 and 1992. A sample of 78 students completed the survey questionnaire; …

Impact Of Changes In Ocean Freight Rates On United States Rice Exports, Jorge Alfonso Alarcon

Theses and Dissertations

The direction and magnitude of the future world rice market is of vital consideration for the rice industries of both exporting and importing countries. Many studies have analyzed the international rice trade; however, there has been no published research that attempted to examine the effects of ocean freight rates on international rice trade. The major objective of this study was to analyze the effects of ocean freight rates on the flows, supplies, demands, and prices of world rice shipments. A reactive programming model, within a spatial equilibrium analysis framework, was developed to obtain equilibrium level estimates of the variables mentioned …

Application Of Sequence Comparison Methods To Multisensor Data Fusion And Target Recognition, Edmund W. Libby

Theses and Dissertations

This research addresses methods for exploiting the joint likelihood of observed kinematic and nonkinematic (sensor signature) physical events to improve dynamic object and target recognition. A principal direction is the application of dynamic programming sequence comparison techniques to condition matching of object signatures to known models according to observed kinematics. A second direction is the application of kinematic/aspect-angle Kalman filter trackers to condition kinematic tracking according to observed signatures. These conditioning processes dramatically reduce ambiguity in object recognition, and can be used together or separately to allow computation of a posterior probabilities of object class membership using Bayesian methods. Proposals …

The Effects Of Time Of Testing And Elevated Blood Glucose On Cognitive Performance., Mark Randolph Hill

Theses and Dissertations

Previous findings have suggested that glucose may enhance performance on memory tasks in rats and humans. However, other studies have shown that the effects of carbohydrates may vary by the time of their ingestion. The present investigation examined accuracy and latencies on a semantic task performed in the morning or evening and under two levels of blood glucose. The task consisted of three subtests. In the first subtest, subjects discerned the physical differences between word pairs. In the second subtest, they looked for word matches, regardless of typographical case. On the third subtest, subjects compared words for membership in the …

Potentials To Increase The Supply Of Mathematics And Science Teachers: An Examination Of A Cohort., Richard Dennis Balsley

Theses and Dissertations

This country has a great need for qualified high school mathematics and science teachers. The shortage has been attributed to low pay and low public esteem for teachers among other factors. To meet the need for these teachers, perhaps consideration should be given to students and to former students who majored in mathematics or one of the sciences while in college. A central purpose of the present study was to learn about these cohorts.The study reports the results of a survey of students and alumni from a single, medium-sized, public university--the University of North Dakota--who majored in mathematics or one …

A Decision Criteria To Select An Associative-Memory Organization That Minimizes The Execution Time Of A Mix Of Associative-Search Operations, David W. Banton

Theses and Dissertations

The dissertation develops a decision criteria to select an associative-memory organization that minimizes the execution time of a mix of associative-search operations and a decision criteria to estimate the layout dimensions of each organization for a specified memory size. The dissertation reclassifies Feng's associative-search operations into three hardware-influenced categories: bit-position independent (BPI), record-content independent (RCI); bit-position dependent (BPD), RCI; and BPD, record-content dependent (RCD). It develops a relationship between the categories and three associative-memory organizations: the CAM, the bit-serial word-parallel associative memory (BSWPAM) , and the extreme-search associative memory (ESAM). A version of the CAM, three versions of the BSWPAM, …

Radome Depolarization Effects On Monopulse Receiver Tracking Performance, Michael A. Temple

Theses and Dissertations

Boresight Error (BSE), defined as the angular deviation between the true position and the apparent position of a target as indicated by a radar, is an important figure of merit for a tracking radar. A significant contributor to system BSE is the protective radome. This research effort employed a GO technique to investigate the effects of a radome on BSE, expanding previous ray- trace receive techniques to include: (1) a uniquely defined/developed mathematical description for each surface within arbitrary multi-layer tapered radomes, (2) an 'ideal' taper function concept for obtaining optimum BSE prediction performance, (3) a generalized technique for calculating …

Phased Array Antenna Analysis Using Hybrid Finite Element Methods, Daniel T. Mcgrath

Theses and Dissertations

This research in computational electromagnetics developed a new method for predicting the near-field mutual coupling effects in phased array antennas, using the finite element method (FEM) in combination with integral equations. Accurate feed modeling is accomplished by enforcing continuity between the FEM solution and an arbitrary number of wave guide models across a ground plane aperture. A periodic integral equation is imposed above the antenna's physical structure in order to enforce the radiation condition and to confine the analysis to an array unit cell. The electric field is expanded in terms of vector finite elements, and Galerkin's method is used …

Linear Characteristic Spatial Quadrature For Discrete Ordinates Neutral Particle Transport On Arbitrary Triangles, Dennis J. Miller

Theses and Dissertations

A new discrete ordinates spatial quadrature for arbitrary triangular cells is derived and compared to its rectangular cell linear characteristic counterpart. The triangular mesh is more flexible, allowing curved surfaces and off-axis angles to be approximated with many fewer spatial cells. The triangle method is consistently more accurate on example problems tested here. Arbitrary orientation and size of the triangles allow non-patterned meshes to be developed which appears to ameliorate numerical diffusion. The triangle linear characteristic quadrature converges at nearly the same rate as rectangular Linear characteristic on Lathrop's problem. Mesh sensitivity measurements show large variations in triangle vertex locations …

Experimental And Analytical Analysis Of The Response Of A Smart Beam To Rate Feedback, Terance J. Hoffman

Theses and Dissertations

A smart beam with embedded sensors and actuators was analyzed and tested. The smart beam studied was constructed from graphite and epoxy with piezoceramic actuators and NiTiNOL sensors embedded. It was mounted vertically and subjected to transverse dynamic loading at the free end. Analytic expressions for the open loop and closed loop response (using strain rate feedback control) of the beam (including internal damping) to external forcing were derived in detail. Experimental testing of the beam verified the accuracy of the predicted open loop response.

Experimental Investigation Of The Effects Of Blowing Ratio Parameter On Heat Transfer To A Film-Cooled Flat Plate, Marco R. Valencia

Theses and Dissertations

The effects of blowing ratio on film cooling effectiveness were investigated. Two round-nosed test plates were used. One made of aluminum and the second of corian (low thermal conductivity). Injection at 35 degrees in the downstream direction was studied. Helium was mixed with air to produce a density ratio (coolant to mainstream) of 1.6 and 2.0, while the blowing ratio varied from 0.3 to 2.2. Surface temperature was measured by thin film gages located up to a nondimensional downstream distance X/D of 30. Two injection regimes, weak and strong, were found. In the weak regime, film cooling reduced gage heat …

Anns An X Window Based Version Of The Afit Neural Network Simulator, Ching-Seh Wu

Theses and Dissertations

This thesis presents an X Window based neural network simulation environment developed at Air Force Institute of Technology (AFIT) using the techniques of modern software engineering. This artificial neural network simulator is a tool running on Sun SPARCstations and supporting two user modes: end-users and client-programmers. End-users interact with neural network paradigms developed by client-programmers for the purpose of studying and analyzing the execution of a particular Neural Network (NN) paradigm, or class of NN algorithms. Client programmers maintain the system and use this environment for the development of new NN paradigms or algorithms for end-users. The development follows a …