Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (5733)
- Physical Sciences and Mathematics (2946)
- Aerospace Engineering (1674)
- Electrical and Computer Engineering (1344)
- Operations Research, Systems Engineering and Industrial Engineering (1245)
-
- Computer Sciences (1234)
- Business (992)
- Physics (918)
- Operational Research (609)
- Signal Processing (459)
- Civil and Environmental Engineering (422)
- Computer Engineering (414)
- Aviation (353)
- Electrical and Electronics (351)
- Social and Behavioral Sciences (349)
- Operations and Supply Chain Management (345)
- Materials Science and Engineering (335)
- Optics (330)
- Oceanography and Atmospheric Sciences and Meteorology (278)
- Navigation, Guidance, Control and Dynamics (252)
- Other Operations Research, Systems Engineering and Industrial Engineering (233)
- Human Resources Management (231)
- Systems Engineering (228)
- Atomic, Molecular and Optical Physics (197)
- Electromagnetics and Photonics (195)
- Aerodynamics and Fluid Mechanics (188)
- Environmental Sciences (188)
- Environmental Engineering (185)
- Nuclear Engineering (180)
- Applied Mathematics (178)
- Keyword
-
- #antcenter (380)
- #csra (134)
- Machine learning (93)
- Decision making (89)
- Algorithms (75)
-
- Global Positioning System (75)
- Image processing (73)
- Kalman filtering (65)
- Optimization (64)
- #afcec (62)
- Computer networks--Security measures (62)
- Drone aircraft (59)
- Computer security (57)
- Target acquisition (57)
- Neural networks (Computer science) (54)
- Software engineering (54)
- Additive manufacturing (52)
- Remote sensing (49)
- Flight control (48)
- Microelectromechanical systems (45)
- Computer vision (44)
- Artificial satellites (43)
- Decision support systems (43)
- #ctisr (42)
- Adaptive optics (42)
- Composite materials (42)
- Neural networks (41)
- Simulation (41)
- Wireless communication systems (41)
- Scheduling (40)
- Publication Year
- Publication
- Publication Type
- File Type
Articles 8461 - 8490 of 8786
Full-Text Articles in Entire DC Network
Comparative Analysis Of Guidance Algorithms For The Hyper Velocity Missile And Afti/F-16, Edward G. Rice
Comparative Analysis Of Guidance Algorithms For The Hyper Velocity Missile And Afti/F-16, Edward G. Rice
Theses and Dissertations
This project has provided me with endless intrigue. In considering the problem of guiding a hyper-velocity missile from a moving platform to a moving target, a common perception said it was just another Kalman Filtration design challenge. I began with lofty intentions of running a full up extended Kalman filter simulation but I became enthralled with the limited work available on the physical limitations of basic guidance algorithms. This became the emphasis of this project. The best filter scheme cannot overcome a guidance algorithms physical limitation. Only with an understanding of these limitations can one effectively integrate a guidance scheme …
Steady-State Production And Quenching Of Br(2P½), Ralph F. Tate
Steady-State Production And Quenching Of Br(2P½), Ralph F. Tate
Theses and Dissertations
The spin orbit relaxation of atoms has been investigated in a steady state infrared fluorescence experiment. A CW argon ion laser operating at 488 nm was used to photodissociate gas-phase Br into equal quantities of Bromine and Bromine atoms. The resulting 2.7 µm emission was observed as a function of added quenching gas. A steady-state analysis was used to determine quenching rates for SF6, N2, O2, He, Ne, Ar, Kr, and Xe, relative to quenching by the parent molecule. Limitations in the apparatus prevented determination of the quenching rate coefficient for Br2. …
Application Of Mixed H2/H∞ Optimization, John J. Kusnierek
Application Of Mixed H2/H∞ Optimization, John J. Kusnierek
Theses and Dissertations
A non-conservative optimization technique is utilized to examine the problem of minimizing the 2 norm of one transfer function subject to an ∞-norm bound on another transfer function. For single exogenous input/ single exogenous output systems this non conservative mixed solution is shown to be up to 5% better in a specific example. For single exogenous input/two exogenous output systems the mixed solution is shown to be up to 27% better than a previous technique for a specific example. Finally, a two exogenous input/two exogenous output practical system is examined to demonstrate the utility of this mixed optimization technique.
Gaseous Component Identification With Polymeric Film Sensor, Edward S. Kolesar Jr.
Gaseous Component Identification With Polymeric Film Sensor, Edward S. Kolesar Jr.
AFIT Patents
A sensor having an interdigitated gate electrode field effect transistor (IGEFET) coupled to an electron beam evaporated copper phthalocyanine thin film is used to selectively detect parts-per-billion concentration levels of atmosphere contaminants such as nitrogen dioxide (NO2) and diisopropyl methylphosphonate (DIMP). The sensor is excited with a voltage pulse, and its time- and frequency-domain response are examined. The envelopes of the magnitude of the normalized difference frequency spectrums reveal features which unambiguously distinguish the NO2 and DIMP exposures.
An Analysis Of Fixed Wing Tactical Airlifter Characteristics Using An Intra-Theater Airlift Computer Model, Paul Pappas
An Analysis Of Fixed Wing Tactical Airlifter Characteristics Using An Intra-Theater Airlift Computer Model, Paul Pappas
Theses and Dissertations
This study used computer simulation to identify which tactical airlifter characteristics most significantly affected tactical airlift capability in a given scenario. The Generalized Air Mobility model was used to simulate a tactical airlift system. Aircraft characteristics within the model were grouped into six variables. A 2(6) two level full factorial experimental design was used to assess the effect of changes in aircraft characteristics on the effectiveness of the tactical airlift system. Yates algorithm was used to identify significant terms based upon the results of the factorial experiment. These significant terms were used to develop a parsimonious regression model that represented …
An Investigation Of Project Management Techniques For Scheduling Raaf Depot Level Maintenance, Kerry M. Bayley
An Investigation Of Project Management Techniques For Scheduling Raaf Depot Level Maintenance, Kerry M. Bayley
Theses and Dissertations
This research investigates scheduling performances of commercial project management software. It is based on difficulties that the Royal Australian Air Force experienced in evaluating microcomputer-based packages in maintenance task scheduling of aircraft undergoing Depot Level Maintenance. A literature review found only one paper quantifying commercial software performances. No standard performance metrics or test data were found. Several packages were evaluated using a common set of 110 single-project resource- constrained networks. The performance measure used was closeness to optimally minimum Total Durations. No package performed best on all problems. On average, the best produced schedules 5.2% longer than optimal, with 95 …
Education Necessary For Air Force Software Managers To Use The Ada Programming Language And Software Engineering Effectively, James W. Worley Jr.
Education Necessary For Air Force Software Managers To Use The Ada Programming Language And Software Engineering Effectively, James W. Worley Jr.
Theses and Dissertations
This research investigated the perceived Ada and software engineering education needs of software managers throughout the Air Force and provided recommendations to Air Staff for developing the education. Since the Department of Defense mandated all DOD agencies use the Ada programming language for software development, the education of the personnel who have to support the policy has lagged behind the implementation Ada is not a simple language to use and is only fully effective if used with sound software engineering principles. A survey was given to Air Force mid-level personnel who manage software in some capacity. Of the software personnel …
A Guide For The Consideration Of Composite Material Impacts On Airframe Costs, Jeffrey L. Isom
A Guide For The Consideration Of Composite Material Impacts On Airframe Costs, Jeffrey L. Isom
Theses and Dissertations
This study provides a guide to cost analysts who must consider the impact of composite materials on airframe costs. A literature review was conducted to determine the availability of cost models which incorporate the effect of composites on cost. A number of models are available, but no individual model was found that is applicable for every situation. In order to provide a baseline upon which analysts can compare model results as well as provide guidance in selecting cost drivers, a Delphi survey was conducted. Questionnaire results indicate that composite weight (as a percentage of total weight), composite part complexity, percentage …
An Investigation Of The Air Force Risk Model, Thomas R. O'Hara
An Investigation Of The Air Force Risk Model, Thomas R. O'Hara
Theses and Dissertations
This study develops a dependent component cost risk model validation methodology and applies it to the Air Force Risk Model. The validation process consists of ensuring that logically consistent input parameters are acted on properly by the cost risk methodology. users of all dependent component risk models must be concerned with logically consistent input parameters. Two criteria define logical consistency. The first is the correlation matrix consistency and the second is the consistency between pairs of cost distributions. Three validation criteria are defined and used to validate a cost risk model. The first criterion is that the process must maintain …
Estimate-At-Completion Research - A Review And Evaluation, John W. Mckinney
Estimate-At-Completion Research - A Review And Evaluation, John W. Mckinney
Theses and Dissertations
This research derives from the Performance Measurement discipline and consists of a comprehensive analysis of Estimate-At-Completion (EAC) studies published since 1973. The EAC studies consisted of models, comparison studies, and computer analysis programs. Each study was categorized by formula type and described in terms of methodology and conclusions. Each study was evaluated based on clarity, documentation, methodology, and source. After reviewing the studies some areas were found to be weak. The AFSC formula that uses weighted percentages of .2 SPI and .8 CPI, is not supported by a critical review of the literature. In the area of comparisons studies, different …
Armaments Cooperation In The Pacific Rim: An Evaluation Framework For The Selection Of Cooperative Arrangements, Douglas P. Constant
Armaments Cooperation In The Pacific Rim: An Evaluation Framework For The Selection Of Cooperative Arrangements, Douglas P. Constant
Theses and Dissertations
This study presents factors which require evaluation prior to entering into a cooperative arrangement. The purpose of the research was to create an evaluation framework to assist DOD managers of international projects with a tool to enable the selection of an appropriate cooperative arrangement type. The study was focused on the Pacific Rim and includes two case studies on the Japanese FS-X and the Korean Fighter Plane. Factors were identified through literature research, case studies, and personal interviews. The study concluded with the identification of six basic factors: technology, industrial base, political, economic, program stage, and requestor's motives.
An Analysis Of The Price Analyst's Role In The Source Selection Process, Rita Lindsey
An Analysis Of The Price Analyst's Role In The Source Selection Process, Rita Lindsey
Theses and Dissertations
This research was conducted to determine if the price analyst's role in the source selection process results in the receipt of efficient contractor proposals and evaluation. The research was limited to the operational level of procurement. A literature review was performed on the evaluation factors used in the source selection process and the role of the price analyst. Interviews were conducted with contracting officers and price analysts experienced in conducting source selections. The research revealed a gap exists between the role of the price analyst as described in the literature and the role described by the field. The price analyst's …
A Model For Estimating Aircraft Recoverable Spares Annual Costs, Phillip L. Redding
A Model For Estimating Aircraft Recoverable Spares Annual Costs, Phillip L. Redding
Theses and Dissertations
This thesis covers three objectives: (1) develop a background reference document concerning recoverable spares cost estimating; (2) evaluate a representative sample of existing spares cost models; and (3) use aircraft physical and performance characteristics to develop a model for estimating annual replenishment spares cost. A condemnations cost estimating relationship (CER) was developed first and then both a CER and spreadsheet generated factors which related condemnations to replenishment spares costs were developed. For the condemnations CER, only logarithmic transformations provided statistically acceptable results, and even these models exhibited wide prediction intervals due to large amount of variability in the CER databases …
A Hypertext Version Of The Certified Professional Contracts Manager Candidate's Workbook, Dean P. Mclain
A Hypertext Version Of The Certified Professional Contracts Manager Candidate's Workbook, Dean P. Mclain
Theses and Dissertations
The purpose of this study was to develop and test a hypertext version of the Certified Professional Contracts Manager Candidate's Workbook and Supplements. A literature review was conducted on two distinct subject areas. The first area includes a review of the findings of six commissions on professionalism of acquisition personnel, initiatives of the Office of Personnel Management, the Defense Acquisition Workforce Improvement Act, and the National Contract Management Association. The discussion of professionalism in contracting establishes the relevance of products like the hypertext workbook completed as a result of this research. The second area is a review of the history …
Identifying Federal Contracting Policy Changes To Improve Government Acquisition Of Commercial Space-Launch Capacity, Bryan S. Moon
Identifying Federal Contracting Policy Changes To Improve Government Acquisition Of Commercial Space-Launch Capacity, Bryan S. Moon
Theses and Dissertations
The study dealt with expressed congressional intent to promote the commercial space-launch industry and defense management emphasis on government use of commercial contracting methods for the purchase of commercial products. The research problem was to determine what contracting policy changes implementing commercial-like practices would benefit the commercial space-launch industry and federal space-launch acquisition. Commercial-like contracting practices include removal of statutory and regulatory barriers to contracting with the government. To accomplish this, the most significant contractual barriers experienced by the industry in doing business with the government were identified. The study hypothesized possible relationships among barriers, acquisition cost variables, industry well-being …
Changes In U.S.-International Arms Trade Practices, Rustam S. Karmali
Changes In U.S.-International Arms Trade Practices, Rustam S. Karmali
Theses and Dissertations
This study sought to highlight the evolution of certain trade practices in U.S.-international arms trade. Limited to the eighties, the study divided the decade into two halves: 1980-84 and 1985-89. For each of the nine trade practices considered, period profiles for the two halves were developed and subsequently compared. The population consisted of the eighteen largest (by dollar value) sales of the decade. They included Air Force, Navy and Army systems. Some programs were FMS programs while others were cooperative or direct commercial sales. The following results were noted: The second half of the decade witnessed some diversification in the …
Defining Contract Terms, Stephanie Shelley
Defining Contract Terms, Stephanie Shelley
Theses and Dissertations
This thesis researched the meanings of 25 contract terms. First the literature was reviewed for existing definitions, then a proposed definition was written for each term, based on the literature search. These definitions were then mailed out to selected contracting professionals for their review. The definitions were then revised based on the comments received.
Cultural Dimensions Of International Business, Anthony L. Amadeo
Cultural Dimensions Of International Business, Anthony L. Amadeo
Theses and Dissertations
The purpose of this study was to identify cultural factors which impede international business in private and public programs, and emphasize the effects of these cultural factors in the international environment. The study emphasized the areas of international program management and negotiations. The study was designed to be an informative guide which program management and contracting professionals could use to increase awareness concerning cultural differences and the barriers presented by them. The study also identified lessons learned to effectively deal with these cultural barriers.
An Expert System Job Aid For Users Of The Automated Scheduling Module, Kevin A. Gore
An Expert System Job Aid For Users Of The Automated Scheduling Module, Kevin A. Gore
Theses and Dissertations
This research developed an Expert System for novice aircraft maintenance schedulers (AFSC: 392XX) with little experience using the Automated Scheduling Module (ASM). First, an in-depth literature review was completed. Next, personal interviews were conducted with an ASM expert and other 392XX personnel. Prototypes using VP-Expert and KnowledgePro shells were created. The knowledgePro shell was selected to create the ASM Job Aid, combining the knowledge of the expert and AFM 66-279. The program was verified, validated, and favorably reviewed by 392XX personnel. Recommendations include: The Air Force Logistics Management Center (AFLMC) examine the ASM Job AId and develop a Performance Support …
An Evaluation Of Logistics Support For F-16 Aircraft Owned By Foreign Countries, Paul J. Lyons
An Evaluation Of Logistics Support For F-16 Aircraft Owned By Foreign Countries, Paul J. Lyons
Theses and Dissertations
The purpose of this thesis was to examine the logistics support provided by the United States Air Force (USAF) for F-16 aircraft owned by foreign countries. The research drew from historical trends and personal experiences to examine the ability of the U.S. to provide logistics support for F-16 aircraft owned by U.S. allies. The study found that timely, efficient support of FMS customers possessing F-16 aircraft does not appear to be a principal concern of the USAF logistics system. Complexity of processes, untimely responses, and failure to consider customer needs are common failings on the part of the USAF.
Analysis Of A Waste Minimization Program For Nonhazardous Solid Wastes Utilizing Source Reduction And Recycling Techniques And Its Application To Air Force Installations, Brian F. Mcdermott
Analysis Of A Waste Minimization Program For Nonhazardous Solid Wastes Utilizing Source Reduction And Recycling Techniques And Its Application To Air Force Installations, Brian F. Mcdermott
Theses and Dissertations
This nation has fallen victim to its own excessive behavior and has created an overabundance of trash, referred to in this thesis as Nonhazardous Solid Waste (NHSW). This situation has created environmental and health problems that can no longer be ignored. All types of communities are affected including Air Force installations. Unfortunately, the AF does not currently have a long term waste management policy or program regarding NHSW minimization. This research concentrates on the application of a NHSW minimization program for AF installations using the two most preferred methods, source reduction and recycling. The development of a comprehensive waste minimization …
War Reserve Materiel Prepositioning Its History, Its Significance, And Its Future, Jack E. King Jr.
War Reserve Materiel Prepositioning Its History, Its Significance, And Its Future, Jack E. King Jr.
Theses and Dissertations
This study puts USAF War Reserve Materiel (WRM) into perspective. Its purpose is to serve as an introduction for those who wish to further their knowledge of USAF WRM prepositioning. To fully understand the relevant issues concerning the placement of critical European WRM stockpiles, several areas of research are encompassed in this review. An historical analysis of US military logistics is provided. Then, an overview of current, world-wide events taking shape around the world, with particular emphasis given to their effects on US decision-making strategies, is accompanied by a synopsis of both US and Soviet military doctrine.
A Decision Support System To Assist Manpower Forecasting In The Royal Australian Air Force, Simon J. Kelly
A Decision Support System To Assist Manpower Forecasting In The Royal Australian Air Force, Simon J. Kelly
Theses and Dissertations
This study considers a problem that faces Royal Australian Air Force (RAAF) manpower and personnel managers. Information decisions on the future force structure of the RAAF officer corps can be made by managers if they have access to objective, valid, reliable forecasts. At present, the RAAF has no standard mechanism to perform forecasts--a variety of tools are used. Given the importance and cost of the manpower resource, one integrated forecasting tool would support manpower decisions greatly. The aim of this research is to address the existing forecasting deficiency in the RAAF and provide an automated system to integrate current forecasting …
An Analysis Of Measures Used To Evaluate The Air Force Critical Item Program, Robert R. Lee
An Analysis Of Measures Used To Evaluate The Air Force Critical Item Program, Robert R. Lee
Theses and Dissertations
The purpose of this study was to evaluate the potential of two measures, percent defects and cycle time, to measure the overall performance of the Air Force Critical Item Program (CIP). The need for such study was generated from the current absence of any measurement system available to evaluate the CIP. This research used these two measures with actual data, evaluated the correlation between aircraft availability and percent defects and cycle time, and analyzed management perceptions addressing the usefulness of these measures for field use. Performance of this analysis resulted in support for these measures by over two thirds of …
Inaccurate Data Entry Into The Air Force Maintenance Data Collection System, Jon R. Determan
Inaccurate Data Entry Into The Air Force Maintenance Data Collection System, Jon R. Determan
Theses and Dissertations
This research investigated the data collection environment under the Core Automated Maintenance System (CAMS), a computerized information system used in the Air Force's aircraft maintenance complexes. The research measured maintenance personnel's perception of the nature, extent, and causes of data inaccuracies occurring in the CAMS data collection environment. The nature was differentiated as being either intentional or accidental. Maintenance personnel felt that difficulty in entering information into CAMS accounted for the largest percentage of intentional errors and that insufficient training on CAMS accounted for the largest percentage of accidental errors. A comparison of this research to the results of earlier …
Analysis Of Department Of Defense Organic Depot Maintenance Capacity Management And Facility Utilization Factors, Marlies Dewoody
Analysis Of Department Of Defense Organic Depot Maintenance Capacity Management And Facility Utilization Factors, Marlies Dewoody
Theses and Dissertations
This study investigated the effects of mandated depot capacity utilization rates on throughput, inventory, and operating expense. The measures of merit analyzed were work in process inventories, leadtime, and throughput. Since the services do not use a common computer system to track/compute capacity data, a computer simulation provided the data used to meet the research objectives. The simulation modeled a serially interdependent system subject to statistical fluctuations. Variability in the system was reduced by reducing the spread around the processing time mean. Buffer inventories were placed in front of each process to protect the process from variability. Constrained systems were …
Heuristics For Hospital Inventory Management, Thomas G. Hibson
Heuristics For Hospital Inventory Management, Thomas G. Hibson
Theses and Dissertations
This study investigated the reasoning strategies used by hospital logistics management experts and was conducted at the Wright-Patterson AFB (WPAFB) Medical Center. An expert system was developed to verify the captured strategies. The particular area of interest of this study was the reasoning strategies involved in the reconciliation of the Monthly Stock Status Report within the Medical Logistics Branch. A literature review revealed there were few guidelines as to when and what action to pursue when reconciling the Monthly Stock Status Report. Though there were no references in the literature on expert systems that dealt with this particular report, there …
A Comparison Of The All Mobile Tactical Air Force And The Logistics Composite Simulation Models, David P. Leonhardt
A Comparison Of The All Mobile Tactical Air Force And The Logistics Composite Simulation Models, David P. Leonhardt
Theses and Dissertations
LCOM with respect to the number of sorties generated and the number of maintenance manpower hours utilized during a 60-day scenario. A 2(n) factorial experimental design was used for the study with an n-value of three. Three variables, the number of LRUs available in the supply pool, the number of personnel available for maintenance tasks, and the quantity of AGE available on the base, were allowed to take on either a constrained or unconstrained value in the study. A distribution of the differences in each output variable between the two models was developed and a confidence interval of the distribution …
An Analysis Of The Defense Logistics Agency Medical Supplies Requisition Process, Sandra H. Mchugh
An Analysis Of The Defense Logistics Agency Medical Supplies Requisition Process, Sandra H. Mchugh
Theses and Dissertations
Defense reorganization initiatives coupled with demands for significant cost reductions exerted tremendous operating pressures on the Defense Logistics Agency (DLA). DLA senior management focused on process management as an approach to simultaneously assure appropriate levels of customer service and cost. The first step in this approach was to fully understand current management processes. As such, the thesis objective was to document the medical supplies order cycle process by tracing the path of information through the logistics pipeline. Detailed flowcharts and narrative descriptions were employed to demonstrate the activities of those organizations responsible for processing Air Force orders for medical supplies. …
Combat Service Support And The Total Force, Lewis A. Germann
Combat Service Support And The Total Force, Lewis A. Germann
Theses and Dissertations
This study determined the minimum essential active Army Total Force Combat Service Support structure required for Contingency Force (CF) operations to provide the Army with the necessary organization for a response to a national crisis. A model called MICROFASTALS, used in combination with LOTUS 1-2-3 software, developed these forces. A literature search provided background information describing: the history of the Total Force Policy to the present; how the Department of Defense and the Army was organized to meet the Total Force initiatives, including an in depth description of the Army CSS structure; the latest National Security and Military Strategy that …