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Articles 151 - 164 of 164
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Analysis Of Scheduling Policies For A M/G/I Queue With Rework, Jennifer Hendrixson
Analysis Of Scheduling Policies For A M/G/I Queue With Rework, Jennifer Hendrixson
Theses and Dissertations
This thesis analyzes a multi-class M/G/1 priority queueing system in which distinct job types require one service cycle and, with non-zero probability, require a second service cycle. The main objective is to find a new heuristic scheduling policy that minimizes the long-run expected holding and preemption costs. Arrival rates, service rates, and the probability of undertaking second service are all class specific. A mean value analysis (MVA) approach was employed to derive the long- run mean time in queue for each job type under each policy, thereby providing the appropriate cost equations. Numerical experiments suggest that the preemptive resume scheduling …
Using Neural Networks For Estimating Cruise Missile Reliability, Donald L. Hoffman
Using Neural Networks For Estimating Cruise Missile Reliability, Donald L. Hoffman
Theses and Dissertations
ACC believes its current methodology for predicting the reliability of its Air Launched Cruise Missile (ALCM) and Advanced Cruise Missile (ACM) stockpiles could be improved. They require a predictive model that delivers the best possible 24-month projection of cruise missile reliability using existing data sources, collection methods and software. It should be easily maintainable and developed to allow a layperson to enter updated data and receive an accurate reliability prediction. The focus of this thesis is to improve upon free flight reliability, although the techniques could also be applied to the captive carry portion of the missile reliability equation. The …
Physical Fitness And The Expeditionary Air Force, Elizabeth T. Lewis
Physical Fitness And The Expeditionary Air Force, Elizabeth T. Lewis
Theses and Dissertations
The Air Force is constantly evolving. With the many changes and the Expeditionary Air Force structure put in place, it is more important now than ever that the Air Force has a physical fitness program to keep its members healthy and productive. By doing this, it can ensure success in completing the Air Force mission while keeping the organization at the highest level of readiness possible. This thesis looks at what the Air Force values in having a fitness program. These values are taken from Air Force doctrine and related instructions. Using these values, fitness programs can be evaluated to …
Use Of Multivariate Techniques To Validate And Improved The Current Usaf Pilot Candidate Selection Model, Ross A. Keener
Use Of Multivariate Techniques To Validate And Improved The Current Usaf Pilot Candidate Selection Model, Ross A. Keener
Theses and Dissertations
The Pilot Candidate Selection Method (PCSM) seeks to ensure the highest possible probability of success at UPT. PCSM applies regression weights to a candidate's Air Force Officer Qualification Test (AFOQT) Pilot composite score, self-reported flying hours, and five Basic Attributes Test (BAT) score composites. PCSM scores range between 0 and 99 and is interpreted as a candidate's probability of passing UPT. The goal of this study is to apply multivariate data analysis techniques to validate PCSM and determine appropriate changes to the model's weights. Performance of the updated weights is compared to the current PCSM model via Receiver Operating Curves …
Modeling Homeland Security: A Value Focused Thinking Approach, Kristopher A. Pruitt
Modeling Homeland Security: A Value Focused Thinking Approach, Kristopher A. Pruitt
Theses and Dissertations
The events of September 11, 2001 have propelled the topic of homeland security to the forefront of national concern. The threat of terrorism within the United States has reached an unprecedented level. The pervasive vulnerabilities of the nation's critical infrastructure coupled with the destructive capabilities and deadly intentions of modern terrorists pose extraordinary risks. The United States must mitigate these risks while at the same time balancing the associated costs and impact on civil liberties. Currently, the United States lacks effective methods and measure for assessing the security of the homeland from acts of terrorism. This study outlines a first …
A Simulation Based Comparative Analysis Of Alternatives For Tuition Assistance Organizational Structures, Tamiko L. Ritschel
A Simulation Based Comparative Analysis Of Alternatives For Tuition Assistance Organizational Structures, Tamiko L. Ritschel
Theses and Dissertations
The military services have experienced enormous downsizing efforts in the last decade. With these initiatives, organizations have had to derive innovative ways to meet their objectives with fewer resources. An organization's structure is an avenue to address these challenges within the atmosphere of a shrinking capital budget. Organizational structure changes can affect every aspect of the organization. Such an impact suggests proposals for drastic organizational changes must meet the rigors of a full analysis. The intent of this research is to provide a comprehensive analysis of centralization options for Air Force Tuition Assistance efforts. This thesis effort involves the development …
Models For Sortie Generation With Autonomic Logistics, Nicholaus A. Yager
Models For Sortie Generation With Autonomic Logistics, Nicholaus A. Yager
Theses and Dissertations
The primary objective of this research is to investigate the impact of an autonomic logistics system (ALS) on the sortie generation process for an individual airbase. As in some prior studies of this process, the methodology used to model the sortie generation process is a queueing network containing fork-join nodes for concurrent maintenance activities. The sortie generation rate is commonly regarded as the primary performance measure of the sortie generation process. This measure coincides with the throughput and is used to compare two models: (1) pre-ALS operations and (2) ALS-enhanced airbase operations. Analysis of the models shows that the ALS …
An Investigation Of The Effects Of Correlation In Sensor Fusion, Susan A. Storm
An Investigation Of The Effects Of Correlation In Sensor Fusion, Susan A. Storm
Theses and Dissertations
This thesis takes the first step towards the creation of a synthetic classifier fusion-testing environment. The effects of data correlation on three classifier fusion techniques were examined. The three fusion methods tested were the ISOC fusion method (Haspert, 2000), the ROC "Within" Fusion method (Oxley and Bauer, 2002) and the simple use of a Probabilistic Neural Network (PNN) as a fusion tool. Test situations were developed to allow the examination of various levels of correlation both between and within feature streams. The effects of training a fusion ensemble on a common dataset versus an independent data set were also contrasted. …
Multimission Aircraft Design Study-Operational Scenarios, Nevin Coskuner
Multimission Aircraft Design Study-Operational Scenarios, Nevin Coskuner
Theses and Dissertations
In the most recent years, the Command, Control and Communications, Counter Measures, Intelligence, Surveillance and Reconnaissance (C3CMISR) aircrafts are used commonly in many NATO and UN Operations around the world. These aircrafts are AWACS, JSTARS, Rivet Joint, Compass Call and ABCCC. They provide close air support in the name of airborne surveillance, ground moving target surveillance, target reconnaissance, jamming, and command, control and communications issues in operational environments. Those aircrafts are tasked with a wide variety of missions than ever before in operational theaters and each one of them comprises a specific amount of cost and risk factors. As a …
Cargo Aircraft Bombing System (Cabs), Gurler Ari
Cargo Aircraft Bombing System (Cabs), Gurler Ari
Theses and Dissertations
From the early days of aviation, bombs typically have been carried by either fighter or bomber aircraft in the inventory. On the other hand, more and more long-range, precision-guided missiles are being produced with ranges that vary from tens to hundreds of miles. With such missiles, targets can be destroyed without placing personnel and equipment into close proximity to the targets. The mass delivery of standoff weapons could be especially advantageous during the early phases of an air campaign. This study considers the use of cargo aircraft for carrying and launching bombs and missiles. It discusses many aspects of a …
Analysis Of Cooperative Behavior For Autonomous Wide Area Search Munitions, Orhan Gozaydin
Analysis Of Cooperative Behavior For Autonomous Wide Area Search Munitions, Orhan Gozaydin
Theses and Dissertations
This research investigates the effectiveness of autonomous wide area search munitions using cooperative and non-cooperative behavior algorithms under various scenarios. The scenarios involve multiple autonomous munitions searching for an unknown number of targets with different priorities at unknown locations. For the cooperative cases, communications are allowed between the munitions to help locate, identify, and decide to pursue an attack on a target or to continue searching the rest of the battlefield. For non cooperative cases, munitions independently search, detect, identify and decide to attack an identified target or continue to search. Performance of the cooperative munitions depends on numerous parameters …
Satisficing Applied To Simulated Soccer, Jay Packard
Satisficing Applied To Simulated Soccer, Jay Packard
Theses and Dissertations
Satisficing was introduced by the economist Herbert Simon to allow for decisions that are "good enough" when there are insufficient computational resources and knowledge to obtain the optimal outcome. Autonomous multi-agent systems often require such decision making because of the complexity and unknown factors present in such an environment. Satisficing has been extended significantly by Wynn Stirling. Through extended satisficing, he has departed from conventional approaches to autonomous multi-agent systems, based as they usually are on the assumption that each participant is motivated exclusively by its own self interest, and will therefore attempt to maximize its benefit, regardless of the …
Time Aliasing Methods Of Spectrum Estimation, Jason F. Dahl
Time Aliasing Methods Of Spectrum Estimation, Jason F. Dahl
Theses and Dissertations
Time aliasing methods of spectrum estimation alter the time representation of a signal for the purpose of improving its frequency domain representation. Time aliasing allows characteristics of longer time window functions to be used with shorter DFT length. Windows designed specifically for use with time aliasing have improved properties compared to conventional windows. Many previous uses of time aliasing, including overlap-and-add methods of digital filtering, have focused on the elimination of time aliasing effects in the frequency domain in order to improve the representation of reconstructed signals in the time domain and have not addressed the issues associated with spectrum …
Tools And Metrics For Evaluating Modular Product Concepts Based On Strategic Objectives, Matthew Bailey Strong
Tools And Metrics For Evaluating Modular Product Concepts Based On Strategic Objectives, Matthew Bailey Strong
Theses and Dissertations
The design of modular products has recently become the focus of significant research in the area of design theory and methodology. This focus is the result of increased awareness of the potential power of modularity to achieve certain product objectives. However, there continues to be a gap between the results of academic research and industrial application. The refinement, consolidation, and extension of this academic research would help design teams who are charged with developing modular products to use these academic findings in real world, industrial applications. The research presented in this document focuses on developing design tools, based on past …