WorldCat Identities

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT

Overview
Works: 1,418 works in 1,422 publications in 1 language and 1,439 library holdings
Genres: Academic theses  Observations 
Classifications: TL711.R4,
Publication Timeline
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Most widely held works by AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
Analyzing Carbohydrate-Based Regenerative Fuel Cells as a Power Source for Unmanned Aerial Vehicles by Olek Wojnar( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Based on current capabilities, we examine the feasibility of creating a carbohydrate-based regenerative fuel cell (CRFC) as the primary power source for unmanned aerial vehicles (UAV) for long endurance missions where station keeping is required. A CRFC power system is based on a closed-loop construct where carbohydrates are generated from zooxanthellae, algae that create excess carbohydrates during photosynthesis. The carbohydrates are then fed to a carbohydrate fuel cell where electric power is generated for the UAV's propulsion, flight control, payload, and accessory systems. The waste products from the fuel cell are used by the zooxanthellae to create more carbohydrates, therefore mass is conserved in the process of power generation. The overall goal of this research is to determine if CRFCs should be explored further as a viable power source. Through simulations, a UAV is sized to determine if greater than 24 hour endurance flight is possible and these results are compared to UAVs using more traditional photocell based power systems. The initial results suggest that more research should be done in the development of CRFCs as a power system for long endurance UAVs. The final outcome of this research is to identify the most important areas for more detailed follow-on work in designing a production-ready CRFC power system for long endurance UAVs
Romance of Leadership as a Leader Emergence Predictor by Troy A Cerny( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

The purpose of this paper is to examine whether a link between romance of leadership and leader emergence exists. To test this proposition, a sample population was drawn from a military leadership development program for senior enlisted personnel. The school's 406 students were broken into 28 separate groupings called "flights", each led by an instructor. The data for this study was obtained by administering the Romance of Leadership Scale (RLS) and observing leader emergence within the individual flights over a six-week period. The hypothesis that individuals who exhibit a high romance of leadership will be more likely to emerge as a leader was supported (p <.05) in the case of peer ratings. The assertion that locus of control will moderate the relationship between romance of leadership and leader emergence received strong support in the case of instructor ratings (p <.001) and partial support in the case of peer ratings (p <.06)
Evaluating Experiential Leader Development: A Programmatic Evaluation and Comparison of the Effectiveness of US Air Force Squadron Officer School Curricula by Jeffrey G Holland( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Leader development programs often employ experiential learning exercises. The impact of such exercises is not clear. This research investigated experiential leader development using a quasi-experimental design to analyze the differences in two consecutive US Air Force Squadron Officer School (SOS) in-residence classes. The curriculum was altered between classes by the addition of the Combat Leadership Exercise (CLX), an experiential war-gaming activity. Experiential programs regularly use mean differences between pretest and posttest measurements to represent program impact. However, research shows that participants may change the way they evaluate themselves between test administrations due to their experiences in the programs, a phenomenon known as response shift. Response shift renders results of mean differences evaluation invalid. The common means differences showed SOS had weak impact on leader development and showed no difference between the treatment class (CLX) and the comparison class (no CLX). However, structural equation modeling identified the presence of response shift within each SOS class, indicating that students had reconceptualized or recalibrated certain aspects of leadership measured before and after SOS. The implications of response shift and its measurement are discussed. An argument for changing the leader development evaluation paradigm to legitimize response shift as a program outcome is presented
Interactive decision support system for scheduling fighter pilot training by Cuong Tu Nguyen( Book )

2 editions published in 2002 in English and held by 1 WorldCat member library worldwide

ELECTRONIC FILE CHARACTERISTICS: 1 file; MS Excel (. XLS). PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 3.75 MB. SYSTEMS DETAIL NOTE: IBM-clone PC-compatible. ABSTRACT: Fighter Pilots students undertake an intense 120-day training program. New classes of students enter the training program at regular intervals. Students endured rigorous academic, simulator, and aircraft training throughout the program. Squadron schedulers ensure the multiple classes and students are scheduled for the activities. Simulator and aircraft training are scheduled individually for each student. Academic training is taught to the class. Aircraft utilization must also be considered. Aircraft Sortie training is also constrained by daylight hours. Additionally, students are limited to a maximum of three training events in a given day. Squadron schedulers must balance these requirements to ensure students meet their training requirements and successfully graduate. The dynamic training environment requires advanced robust schedules with flexibility to accommodate changes. A Visual Interactive Modeling approach is used to generate schedules. Current schedules are being generated manually with an Excel spreadsheet. Taking advantage of Excel's Visual Basic programming language, the Excel tool is modified in several ways. Scheduling Dispatch rules are implemented to automatically generate feasible schedules. Graphical User Interfaces are used to create a user-friendly environment. Schedulers guide the schedule building process to produce a robust schedule. An attrition environment is created to simulate attrition probabilities of aircraft sortie training due to operations, maintenance, weather, and other cancellations. Analysis of dispatch rules are analyzed
Investigation of aerobraking to return the space maneuver vehicle to low Earth orbit from geotransfer orbit by Benjamin M Berlin( Book )

2 editions published in 2005 in English and held by 1 WorldCat member library worldwide

ELECTRONIC FILE CHARACTERISTICS: 17 files; Adobe Acrobat (. PDF), MS Word (. DOC), and MATLAB files (.M). PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 21.5 MB. SYSTEMS DETAIL NOTE: MATLAB is required to view certain files. ABSTRACT: This study investigated the use of ballistic and Double-Dip' aerobraking reentry to return the Space Maneuver Vehicle (SMV) from geotransfer orbit in no more than two atmosphere passes. Lift and drag accelerations were applied to the two body problem when either of their magnitudes exceeded 111000 g. Lft and drag coefficients, along with the SMV model, were taken from Investigation of Atmospheric Reentry tor the Space Maneuver Vehicle by Captain McNabb, AFIT/GA/ENY/O4-M03. Target perigees were formulated using the two-body problem. The orbit from each target perigee was numerally integrated around a planar earth model using a fourth order Runge-Kutta method. Ballistic and "Double-Dip" reentry schemes were attempted with 45 and 70 km altitude floors. Ballistic reentry produced a near circular, low earth orbit when the SMV's true perigee altitude resided between 66.801 and 68.449 km for a one pass reentry and between 72.226 and 73.445 km for a two pass reentry. "Double-Dip" reentry produced a near circular, low earth orbit when the SMV's perigee altitude rested between 62.416 and 64.962 km. The resulting perigee windows, their respective heating rates, and experienced accelerations were analyzed. Effects of uncertainty in the atmosphere model on successful perigee windows for each reentry scheme were analyzed by repeating the simulation with an increased atmospheric density
Modeling and Simulation of Commercial Satellite Imagery Processes (CD-ROM) by David A Shultz( Book )

2 editions published in 2005 in English and held by 1 WorldCat member library worldwide

ELECTRONIC FILE CHARACTERISTICS: 31 files; Adobe Acrobat (. PDF), MS Excel (. XLS), MS PowerPoint (. PPT), MS Access (. MDB), and simulation files. PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 466 MB. SYSTEMS DETAIL NOTE: Arena and Satellite Digital Analysis Program are required to view certain files. ABSTRACT: The purpose of this research was to develop a general, statistical model of order-to-delivery times for commercial satellite imagery. The research looked at the current four satellites providers with 3-meter or better imagers in the Context of a generalized model of commercial imaging satellite operations. Existing methods use orbit analysis tools to determine imaging time of a specified target based on defined satellite position and times hut can only develop shortest and longest times to an imaging opportunity. To address the general question of the time to deliver an image for non-specific targets, this research develops a process model using Arena simulation software and random targets within large defined regions. Analysis of delivery times conducted on the output reveals dependencies on collective satellite coverage, prediction of weather over the target area, number of collection requests in the system and the computer and Communications resources of the satellite operator
Modeling and analysis of clandestine networks by Clinton R Clark( )

2 editions published in 2005 in English and held by 0 WorldCat member libraries worldwide

Since Sept. 11, 2001, there has been great interest in the military and intelligence communities in using Social Network Analysis (SNA) to support the disruption and destruction of global terrorist networks. SNA results, however, tend to be descriptive and are limited due to the lack of advantageous properties of the relationship measures applied to the arcs in a social network. Further, SNA techniques generally focus on a single network context while real relationships are based in multiple contexts. This thesis develops a new proxy measure of pair-wise potential influence between members of a network, a Holistic Interpersonal Influence Measure (HIIM). The HIIM considers the topology of the multiple formal and informal networks to which group members belong as well as non-network characteristics such as age and education level that may indicate potential influence. The HIIM, once constructed results in a network of pair-wise potential influence between group members. Further, the numeric properties of the HIIM are appropriate for use in Operations Research Network Flow models, which will enable analysts to provide prescriptive analysis focused on specific actions and their outcomes. In addition to an overall measure of influence, the HIIM methodology provides important intermediate results such as the development of operational group profiles The methodology is applied to open source data on both Al Qaeda and the Jemaah Islamiah (JI) terrorist networks. Key leaders are identified, and leadership profiles are developed. Further, a parametric analysis is performed to compare influence based on individual characteristics, network topology characteristics, and mixtures of network and non-network characteristics
Air mobility command passenger reservation center system analysis by Robert E Tuttle( )

1 edition published in 2001 in English and held by 0 WorldCat member libraries worldwide

The Department of Defense (DoD) has undergone a massive downsizing in an effort to comply with President Clinton's directive to 'reinvent' government making it more efficient. Therefore, the DoD revamped its $3.5 billion annual official business travel program. The core of this project is the Defense Travel System (DTS), an Internet based solution providing personally arranged travel, largely circumventing the base transportation offices. This thesis looks at DTS's Air Mobility Command passenger reservation management. This program is comprised of four geographically separated Passenger Reservation Centers located in Scott AFB IL, Japan, Germany and Hawaii. The objective of this study was to analyze and measure PRC operating metrics and benchmark the major civilian air carriers to determine if a more efficient structure exists for the PRC. The conclusions of the study indicate that there is a more efficient structure. The disparity in the manpower to workload within the four PRCs and the absence of any manpower standard by which to measure employee productivity makes it is impossible to accurately improve worker productivity. As benchmarked against industry, the PRC system contains some elements of an efficient system, although some changes are warranted. This study recommends closing the PRC in Hawaii
Use of x-ray pulsars for aiding gps satellite orbit determination by Dennis W Woodfork( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

This research proposes the use of an existing "signal of opportunity"--Namely x-ray pulsars - to improve the accuracy and robustness of the GPS satellite and clock estimation algorithm. Improvement in satellite and clock accuracy results in a direct benefit to the user. A simulation has been developed to determine the effects of using x-ray pulsar measurements on the GPS Operational Control Segment. The epoch-specific position, velocity, and clock errors of all GPS satellites in the constellation were estimated using both pseudoranges and time-difference-of-arrival (TDOA) measurements from pulsars. The primary measure of accuracy is a constellation Signal-In-Space Range Error (SISRE). Results indicate that marginal SISRE improvements (approximately 1%) can be achieved if the x-ray detector is accurate to an order of approximately 40 m for the strongest pulsar. Increasing the accuracy of the x-ray detector by a factor of 100 can yield accuracy improvements up to 26% over the pseudorange-only based GPS system. Additionally, results show that using only 1 strong pulsar to create TDOA observations, may be comparable to using tens of weakly timed pulsars. Pulsar geometry analysis showed that the geometry does have a significant impact on the overall system performance. Results indicate that using TDOAs in the absence of pseudoranges may aid the OCS in keeping track of the GPS satellites until the ground station links can be reestablished
What constitutes an act of war in cyberspace? by Kelli Kinley( )

1 edition published in 2008 in English and held by 0 WorldCat member libraries worldwide

In December 2005 a new mission statement was released by the Air Force Leadership, "to deliver sovereign options for the defense of the United States of America and its global interests ... to fly and fight in Air, Space and Cyberspace." (Wynne & Mosley, 2005) With the stand up of the AFCYBER command and the use of cyberspace to carry out our daily mission the U.S. needs to have a clear understanding of what war in cyberspace looks like and what the laws are governing war in cyberspace. This research and it's resulting data analysis is intended to provide a better understanding of what the current laws of war are and how they translate to cyber war and the complexities that exist, along with recommendation on future revisions of the laws
Modeling groundwater flow and contaminant transport in fractured aquifers by Jason M Bordas( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

The hybrid discrete fracture network/equivalent porous medium (DFN/EPM) model was selected for analysis and application to simulate a contaminated site in this study. The DFN/EPM was selected because it appeared to have the potential to aid decision making by remedial project managers at contaminated DoD fractured aquifer sites. This model can use data that are typically available at a site while incorporating the important processes relevant to describing contaminant transport in a fractured medium. The model was applied to simulate the operation of a pump-and-treat remedial action at a trichloroethene-contaminated fractured aquifer at Pease AFB. The model was able to simulate the salient characteristics of hydraulic and contaminant data collected at the site during operation of the remediation pump-and-treat system. The model was then used to evaluate the impact of various pump-and-treat system designs on contaminant containment at the site. Based on these model simulations, the potential benefits to site managers of using the DFN/EPM approach to model groundwater flow and contaminant transport at fractured aquifer sites were demonstrated
Derivation of a self-consistent auroral oval model using the auroral boundary index by Keith A Anderson( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

The position and intensity of the auroral oval has many implications for the Air Force from determining the effects of incoming electron flux on DoD systems to modeling the ionosphere to exploit current HF communications capabilities. The auroral morphology is a good indicator of the level at which space weather and its near-Earth consequences are occurring, and thus it is important to develop an auroral prediction model. However, since no purely physics-based models exist to describe the temporal and spatial evolution of the auroral zone, space weather practitioners and researchers are forced to produce statistical representations, "organized" by some relevant geophysical parameter. Currently, the most widely used model is the Hardy et al. (1985) auroral oval model, which is binned according to the Kp index. The Kp index is a mid-Iatitude measure of planetary geomagnetic activity, and was presumed to be well-correlated to the size and shape of the auroral region. However, subsequent research has shown that Kp is probably not the best binning parameter. This study used the Auroral Boundary Index (ABI) to parameterize the statistics of the auroral oval location since it is a measurement of the electron fluxes computed directly from sensors aboard the DMSP satellites. Thus, the current work represents a move toward a more self- consistent-and presumably more accurate-climatological representation of the auroral oval boundaries. This was accomplished by recreating the process performed by Hardy et al., substituting the ABI for the Kp index and deriving an entirely new set of auroral ovals based on almost 11 years ofDMSP data from the F8 and F9 satellites. To quantitatively assess the differences between the two models, electron flux values were compared to actual DMSP data of individual satellite passes. Preliminary findings suggest that the new ABI auroral ov
A linear subspace approach to burst communication signal processing by Daniel Erik Gisselquist( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

This dissertation focuses on the topic of burst signal communications in a high interference environment. It derives new signal processing algorithms from a mathematical linear subspace approach instead of the common stationary or cyclostationary approaches. The research developed new algorithms that have well-known optimality criteria associated with them. The investigation demonstrated a unique class of multisensor filters having a lower mean square error than all other known filters, a maximum likelihood time difference of arrival estimator that outperformed previously optimal estimators, and a signal presence detector having a selectivity unparalleled in burst interference environments. It was further shown that these improvements resulted in a greater ability to communicate, to locate electronic transmitters, and to mitigate the effects of a growing interference environment
Automating security protocol analysis by Stephen W Mancini( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

When Roger Needham and Michael Schroeder first introduced a seemingly secure protocol 24, it took over 18 years to discover that even with the most secure encryption, the conversations using this protocol were still subject to penetration. To date, there is still no one protocol that is accepted for universal use. Because of this, analysis of the protocol outside the encryption is becoming more important. Recent work by Joshua Guttman and others 9 have identified several properties that good protocols often exhibit. Termed Authentication Tests, these properties have been very useful in examining protocols. The purpose of this research is to automate these tests and thus help expedite the analysis of both existing and future protocols. The success of this research is shown through rapid analysis of numerous protocols for the existence of authentication tests. The result of this is that an analyst is now able to ascertain in near real-time whether or not a proposed protocol is of a sound design or whether an existing protocol may contain previously unknown weaknesses. The other achievement of this research is the generality of the input process involved. Although there exist other protocol analyzers, their use is limited primarily due to their complexity of use. With the tool generated here, an analyst needs only to enter their protocol into a standard text file; and almost immediately, the analyzer determines the existence of the authentication tests
LQG/LTR tilt and tip control for the Starfire Optical Range 3.5-meter telescope's adaptive optics system by Neil D Paris( )

1 edition published in 2006 in English and held by 0 WorldCat member libraries worldwide

The Air Force Research Laboratory has sponsored research on the tracking control loop portion of the adaptive optics system in the Starfire Optical Range 3.5-meter telescope at Kirtland Air Force Base. The control loop includes two steering mirrors (Coarse Steering Mirror and Fine Steering Mirror) used to remove wavefront tilt and tip phase distortion from light entering the telescope. The objective of this research is to design a single Linear Quadratic Gaussian controller to control both steering mirrors in order to eliminate wavefront tilt and tip distortions induced by the earth's atmosphere, and to evaluate the stability robustness and performance of the controller through simulation and Monte Carlo analysis. Controller design elements and simulation parameters are varied to examine and compare resulting performance and robustness characteristics. The controller design is limited to the use of linear models even though components within the control loop have some nonlinear characteristics; however, consideration has been given to the nonlinear aspects of the system via the simulation environment in order to observe the linear controller in a near-real-world environment
Evaluation of chlorinated solvent removal efficiency among three wetland plant species : a mesoco[s]m study by Jun Yan( )

1 edition published in 2006 in English and held by 0 WorldCat member libraries worldwide

Different species of plants need to be studied individually to compare the remediation efficiency of each species. This research will study three different wetland plants species and an unplanted control, under a laboratory setting. Each plant has a different characteristic favorable for chlorinated solvent degradation. Eleocharis erythropoda (Spike Rush) are plants with thin tube like leaves and large root mass. Carex comosa (Bearded Sedge) has broad leaves and Scirpus atrovirens (Green Bulrush) are broad leafed wetland plants with a long flowering stem during reproduction. PCE will be injected into the plant mesocosm and any possible PCE degradation will be observed. It is my hypothesis that PCE will be degraded into daughter products in all the mesocosms. However, the question will be which plant is the most efficient at chlorinated solvent degradation and is there difference between the planted reactors and the control reactors?
Optimal design of generalized multiple model adaptive controllers by Thomas Brehm( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

Advanced analysis and optimal design techniques that achieve performance improvement for multiple model adaptive control (MMAC) and multiple model adaptive estimation (MMAE) based control are developed and tested for this dissertation research. An adjunct area of research yielded modified linear quadratic Gaussian (LQG) control design techniques that also can be applied to nonadaptive control. For the Modified LQG (MLQG) controller, the proposed designs remove the assumption that the Kalman filter as the observer and the controller gain matrix design are necessarily based on the same model as the best system model. The filter and controller gain matrices are both determined by models possibly other than the system model. In order to achieve optimal performance, the interrelationship of the system model to the filter and controller design models is established by minimizing a position correlation (mean square error on output) measure. Enhanced robustness is realized by considering the performance over the range of values of specified parameter(s) of the system model
Covariance estimation and autocorrelation of NORAD two-line element sets by Victor P Osweiler( )

1 edition published in 2006 in English and held by 0 WorldCat member libraries worldwide

This thesis investigates NORAD two-line element sets (TLE) containing satellite mean orbital elements for the purpose of estimating a covariance matrix and formulating an autocorrelation relationship. Orbit propagation is performed using Simplified General Perturbations Number 4 (SGP4) analytical model as implemented within Satellite Took Kit. For a given satellite, TLEs from a span of two weeks are used to calculate position and velocity differences of estimated state vectors in order to characterize their variance behavior and compute a covariance matrix for the most recent TLE. Six satellites and eight time spans are investigated, with all state vector differences evaluated in satellite-based coordinate systems. An autocorrelation relationship for each satellite is generated to characterize confidence levels of the orbit predictions. Trends in the deterministic dynamics and errors in the model are observed and discussed. Covariance matrix estimates and associated TLEs are presented
Use of two-way time transfer measurements to improve geostationary satellite navigation by Benjamin G Dainty( )

1 edition published in 2007 in English and held by 0 WorldCat member libraries worldwide

An emerging use of GPS is to provide accurate navigation information for satellites in orbit. The GPS satellites are designed to provide service to terrestrial users, so the antenna array points directly towards the Earth and uses a narrow primary beamwidth. Because GEO altitudes are well above the GPS constellation, the Earth occludes most of the GPS signals to the satellite. Decreased satellite visibility is debilitating, as GPS navigation requires at least four visible satellites to determine position. To assist with the visibility problem, the receiver can look at the GPS satellite transmit antenna side lobes, but this does not entirely solve the navigation problem. GPS measurements are inherently bound by receiver clock errors. The clock error must be known or estimated in order to obtain meaningful ranging information. To obtain three-dimensional positioning, at least four satellites must be tracked to solve for three dimensions of position plus the receiver clock error. A new method for improving geostationary navigation accuracy using GPS is to correct the time error by including Two-Way Time Transfer (TWTT) measurements. TWTT is a technique in which signals are simultaneously exchanged between two clocks, and is one of the most accurate methods of comparing clocks. By effectively removing the clock error between the GPS satellite and the GPS receiver, TWTT allows meaningful information to be gathered when less than four GPS satellites are available. The results show a 21-38% improvement in the 3-D RMS position accuracy while using TWTT between the GEO satellite and an atomic clock on the ground. There was a 60-70% improvement when the clock on the ground was synchronized to GPS time
Goal programming tanker beddown decision by George C Hackler( )

1 edition published in 2008 in English and held by 0 WorldCat member libraries worldwide

With the reduction of forward basing of U.S. military forces, the increase in global operations and a move toward expeditionary forces, the United States Air Force's tanker fleet is increasingly crucial to the success of all military services. Past reductions of the Air Force's tanker fleet and an ever increasing age of the tanker fleet makes fast, efficient, and effective planning a must. A critical aspect of tanker planning, that affects all other aspects of tanker operations, is the beddown decision. Beddown decisions directly affect the amount of fuel that can be offloaded to receivers and the number of tanker sorties that can be flown in support of operations. Given the importance of tanker aircraft to mission success, planners still lack rough cut planning tools that can assist in the early planning stages of tanker employment. By combining research conducted by Major Mark Macdonald and Captain Michael Sere, a rough cut goal program can be developed that will assist tanker planners in making beddown decision. This tool can provide planners with the data required to make beddown decision based off potential capabilities and possible capability trade-offs. While this tool is not suitable to plan or conduct operations with, it will allow planners to quickly calculate potential capabilities and assist in the planning process
 
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