Digital Commons Network^™

High Altitude Airship Station-Keeping Analysis, Douglas P. Kondrack

Theses and Dissertations

Lighter-than-air vehicles were once widely utilized by most major militaries. The airship’s extended range and flight endurance made them the optimal vehicle for surveillance and reconnaissance. These flight characteristics have created new interest in using lighter-than-air vehicles as high altitude surveillance and communications platforms. Future Department of Defense plans include high altitude airships that will operate at near space altitudes and take advantage of the low wind region in the upper atmosphere located at approximately 24 km. A high altitude airship could provide 24-hour coverage of a target area if operated in this low wind region. This study investigated the …

Forecasting Mental Health Care Cost For Oif And Oef Veterans, Phil Andrew L. Bernal

Theses and Dissertations

The war in Iraq has been the longest sustained ground combat that the US military has engaged since the Vietnam War. With the ongoing battle against the global war on terrorism, many military personnel will be deployed to hostile areas in support of these operations. The effects of multiple deployment and combat engagement on the mental health of military personnel have been extensively studied. The impacts of mental illnesses, such as PTSD, are tied to longer period in the combat zone. Meeting the psychiatric needs of these veterans will be costly: rehabilitation, retraining, post combat counseling, long-term medical treatment, and …

Structural Reinforcement Layout And Sizing Optimization Of A Composite Advanced Sail, Jeremy Craig Lokits

Theses and Dissertations

Structural reinforcement layout optimization can be a very useful tool in the preliminary stages of design. In this research, sizing optimization techniques are used to generate results very similar to traditional layout optimization techniques with advantages in composite modeling and available strength and stability responses. Both linear and nonlinear sizing-to-design variable relationships are applied to a composite advanced sail design problem with high and low-complexity finite element models. An alternate methodology based on fractionalactorial-design and response surface modeling is also presented with promising results for finding the globally optimum reinforcement layout design. The stiffener layouts obtained from the different approaches …

An Investigation Of Violence-Related Trauma At Two Sites In The Pickwick Basin: Dust Cave (1lu496) And The O'Neal Site (1lu61), James Harvey Turner Ii

Theses and Dissertations

Osteological evidence for violence has only in recent times been thoroughly investigated. Several kinds of traumas indicative of violence have been identified in human skeletal remains worldwide. Such traumas include scalping, embedded and/or associated projectile points, cranial fractures, parry fractures and defensive injuries, decapitation and dismemberment, and evidence of cannibalism. Analysis of traumas at Dust Cave (1LU496) and the O?Neal site (1LU61), two sites in northwestern Alabama with Middle and Late Archaic occupations, was undertaken. Violence-related traumas were observed at both sites. A highly significant difference exists in trauma patterns between the sites. Results were compared to research done on …

Cyber-Crime Fear And Victimization: An Analysis Of A National Survey, Abdullah Al-Shalan

Theses and Dissertations

The aim of this study was to investigate cyber-crime victimization among Internet users in the United States by: 1) assessing the factors that impact computer virus victimization; 2) assessing the factors that impact cyber-crime victimization; and 3) predicting fear of cyber-crime. Two domains in criminology were applied to the study of cyber-crime phenomenon: routine activity theory, and the fear of crime literature. Three independent models were developed to predict computer virus victimization, cyber-crime victimization, and fear of cyber-crime. Measures of routine activity theory applied to cyber-crime victimization include risk exposure, and suitable targets were created. A more reliable measure of …

Social Reality Versus Theatrical Portrayal: Puerto Rican Gangs In West Side Story, Rebecka Peterson

Theses and Dissertations

“Social Reality Versus Theatrical Portrayal: Puerto Rican Gangs in West Side Story” asks the question of whether or not the acclaimed Broadway musical West Side Story is more than just a museum piece. I hypothesize that its success can be linked to its continuing social relevance concerning Puerto Rican gangs in New York City. To evaluate the musical’s social relevance, the socioeconomic condition of Puerto Ricans in New York City is examined during three specific time periods and compared to the condition of the Puerto Rican gang, the Sharks, as portrayed in the musical. The three periods are the 1950s, …

Enhancing The Knowledge Level Of Student Nurses About The United States And Guatemala, Lucy A. Meyer

Theses and Dissertations

This descriptive study determined the knowledge level of student nurses before and after an educational presentation. Thirty-two freshman student nurses in the Nursing 298 class took part in this study. Participants were given a questionnaire that measured their knowledge level regarding the impacts of culture, poverty, homelessness, and psychiatric illness in the United States and the third world country of Guatemala.

Data for each of these areas was analyzed and a significant increase in the level of knowledge was noted between pre-test and post-test results. Relevant findings indicated that the average test score on pretests taken prior to the educational …

An Interactive Relaxation Approach For Anomaly Detection And Preventive Measures In Computer Networks, Garrick A. Bell

Theses and Dissertations

It is proposed to develop a framework of detecting and analyzing small and widespread changes in specific dynamic characteristics of several nodes. The characteristics are locally measured at each node in a large network of computers and analyzed using a computational paradigm known as the Relaxation technique. The goal is to be able to detect the onset of a worm or virus as it originates, spreads-out, attacks and disables the entire network. Currently, selective disabling of one or more features across an entire subnet, e.g. firewalls, provides limited security and keeps us from designing high performance net-centric systems. The most …

Gas Chromatography: Mass Spectrometry Of Chemical Agents And Related Interferents, Lailiang Zhai

Theses and Dissertations

One of the main problems encountered in chemical analysis operations in the field is collecting sufficient sample from the source and transferring that sample to the measurement instrument for fast separation and identification. I have been involved in developing a field-portable gas chromatography-mass spectrometry (GC-MS) system with solid phase microextraction (SPME) sampling for point detection of chemical agents. The objective is to minimize the analysis time between sampling and detection of a potential chemical threat. SPME offers a convenient means for sampling gaseous and liquid samples, concentrating the analytes, and transferring the analytes to the injection port of a GC …

Technology Transition: Guidance Versus Practice, Walter E. Espy

Theses and Dissertations

The transition of technologies ensures that U.S. warfighters have the necessary capabilities to fight ever increasing and changing global threats. The purpose of this study is to discover to what extent the Air Force Research Laboratory (AFRL) is implementing known technology transition best practices. The research will look at the current guidance on technology transition and determine if it is being used by program managers within AFRL. The study will consider the technology transition process or processes expressly exercised within AFRL by surveying the perspectives and knowledge of program managers. An understanding of this process from the science and technology …

Coalition Modeling In Humanitarian Assistance Operations, Sung Wan Bang

Theses and Dissertations

Multinational operations are carried out to achieve military and diplomatic objectives in various regions. Such operations derive a great deal of benefits from sharing budgets, political legitimacy, sharing each national experience and technological resources, and so forth. However, a coalition, one structure of multinational operations, often involves serious challenges in such areas as command and control, logistic support, communication and language, training, and intelligence and information due to its ad hoc characteristics. This research reviews general problems in a coalition operation, and develops the Coalition Operation Planning Model to assist coalition commanders or staff in producing an efficient operational plan. …

Soil Stable Carbon Isoptope Analysis Of Landscape Features At Aguateca, Guatemala, David R. Wright

Theses and Dissertations

The ancient Maya of the Classic period (1700-1050 B.P.) relied on maize agriculture to support their populations. The agricultural systems they employed to produce that maize varied in form and degree of intensity, with more productive forms of agriculture needed in the Late Classic period (1350-1050 B.P.) to sustain the peaking population. It is likely that the ancient systems of production agriculture contributed to environmental degradation that in turn contributed to the pressures that culminated in the collapse of the civilization. In this study, stable carbon isotope ratios contained in the soil organic matter were used to further investigate ancient …

Buying A Better Air Force, Jenny O. Herald

Theses and Dissertations

The purpose of this study was twofold: (1) to capture the United States Government's revealed preference for air superiority using the hedonic pricing approach (HPA), and (2) to compare the characteristics of U.S. Air Force (USAF) fighter aircraft with those of the former Soviet Union to evaluate the effectiveness of the USAF fleet. The resulting analysis showed that the U.S. Government is paying for physical and performance characteristics such as engine thrust, service ceiling, range, and large-scale integrated circuit technology. However, evidence suggests that the government is not paying to have a relative advantage over the enemy based on the …

Comparative Analysis Of Biosurveillance Methodologies, David M. Kempisty

Theses and Dissertations

The purpose of this research is to compare two different biosurveillance methodologies: BioWatch and "A Hot Idea". BioWatch is fielded and operating in major US cities today. Air samples are collected on filter paper and analyzed for the presence of harmful biological agents. "A Hot Idea" is an evolving methodology using the human body's immune response to identify the onset of infection from a harmful pathogen. Detecting a temperature increase, using infrared thermographers, in a statistically significant portion of population would allow earlier identification of a biological release, accelerating initiation of response actions. A selected population including policemen, firemen, and …

High Performance Individuals And How They Manage Their Personal Knowledge For Decision-Making: An Exploratory Study Of Us Air Force Leaders, Kenneth M. Ivey

Theses and Dissertations

The ability of Colonels, Generals, and Chiefs to effectively manage their personal knowledge may lead to better decisions; however, the Air Force does not have an understanding of how these high performance leaders manage their personal knowledge. This research used a multiple-case study methodology to explore how USAF leaders manage their personal knowledge when making routine and novel decisions. Viewing personal knowledge management as it related to sociotechnical theory provided the basis to determine how the need to accomplish the tasks associated with personal knowledge management impacted the people, technology, organizational structure, and the tasks associated with managing personal knowledge. …

Modeling Network Centric Warfare (Ncw) With The System Effectiveness Analysis Simulation (Seas), Jason B. Honabarger

Theses and Dissertations

Significant technological advances over the past few decades have fueled the continual and rapid development of an information-based world. Network Centric Warfare (NCW) has become the buzzword of the young millennium within the Department of Defense (DoD) and is quickly becoming a popularly shared vision and rallying cry for force transformation among United States military leaders. An essential element in fully implementing this network-centric way of thinking is to develop useful measures to help gauge the effectiveness and efficiency of both our military networks and our strategic NCW doctrine. The goal of this research is first to provide a comprehensive …

Modeling Urban Warfare: Joint Semi-Automated Forces In Urban Resolve, Alexander B. Anastasiou

Theses and Dissertations

The United States military is performing operations in urban environments with increasing frequency. Current Department of Defense doctrine is poorly suited to train and equip today's warriors with the tools and experience necessary to fight and win in modern sprawling cities. In order to "close the gap," the U.S. Joint Forces Command's Joint Experimentation Directorate led an effort to run a massively distributed simulation of a synthetic urban environment utilizing human-in-the-loop operators called URBAN RESOLVE. The synthetic environment simulated the city of Jakarta with over 1,000,000 buildings and structures and over 120,000 civilian entities. A Red force retreated into the …

Usability And Accessibility Of Air Force Intranet Web Sites, Richard S. Bentley

Theses and Dissertations

The Air Force is moving to a network centric environment where information must be data visible, accessible, and understandable. This transformation has seen the adoption of the Internet web browser as a de facto standard for information access. The Technology Acceptance Model suggests that information systems must not only be useful but also be usable and a large body of usability engineering knowledge exists to support usable design. In addition, the U.S. government mandates specific minimum design features required to support disabled user access. This research effort seeks to establish an understanding of how well common practice usability design principles …

Bda Enhancement Methodology Using Situational Parameter Adjustments, Michael V. Carras Jr.

Theses and Dissertations

In the context of close ground combat, the perception of Battle Damage Assessment (BDA) is closely linked with a soldier’s engagement decisions and has significant effects on the battlefield. Perceived BDA is also one of the most complex and uncertain processes facing the soldier in live combat. As a result, the modeling and simulation community has yet to adequately model the perceived BDA process in combat models. This research effort examines the BDA process from a perception standpoint and proposes a methodology to collect the pertinent data and model this perception in the Army’s current force-on-force model, CASTFOREM. A subject …

Improving Maintenance Data Collection Via Point-Of-Maintenance (Pomx) Implementation, William D. Cone

Theses and Dissertations

Maintenance data collection is an integral part of flightline aircraft maintenance. Historically, this data was input via traditional keyboard data entry methods at a computer terminal. These terminals are typically located in the aircraft maintenance unit (AMU) facility, away from where the actual maintenance is being performed. In contrast to the traditional approach, the Point-of-Maintenance system (POMX) seeks to reduce the data entry burden while increasing data accuracy through the use of E-Tools such as ruggedized laptop computers and handheld portable maintenance aids (PMAs). POMX enables data entry at the aircraft or other maintenance location via wireless local area network …

In Vitro Toxicity Of Aluminum Nanoparticles In Rat Alveolar Macrophages, Andrew J. Wagner

Theses and Dissertations

Nanomaterials, which are by definition in the 1 - 100 nanometer range, have numerous possible benefits to society, but currently there is a lack of data that characterizes these materials effects on human health and environment. In general nanomaterials are of interest to the Air Force because of their applications in electronics, sensors, munitions and energetic/reactive systems. Nanoparticles such as aluminum have been considered for enhancing propulsion in solid rocket fuel. To date, only a few studies have looked at the toxicological effects of direct exposure to nanoparticles, none with aluminum. It is important to increase the understanding of the …

A Methodology For Performing Effects-Based Assessments, Benjamin A. Thoele

Theses and Dissertations

In order to bring the doctrine of Effects-Based Operations (EBO) into a fully operational capability, Effects-Based Assessment (EBA) must provide relevant insight to the commander and his planning staff. Assessments of an effects-based plan and execution must include an assessment of the effects of a campaign on the enemy in addition to an assessment of the accomplishment of friendly actions taken to achieve the desired effects. Determining the effects of a campaign requires an analysis of the dynamics of the enemy systems. EBA must be able to recognize the states of the enemy's systems as the system states change over …

An Adaptable Energy-Efficient Medium Access Control Protocol For Wireless Sensor Networks, Justin T. Kautz

Theses and Dissertations

Wireless networks have become ubiquitous recently and therefore their usefulness has also become more extensive. Wireless sensor networks (WSN) detect environmental information with sensors in remote settings. One problem facing WSNs is the inability to resupply power to these energy-constrained devices due to their remoteness. Therefore to extend a WSN's effectiveness, the lifetime of the network must be increased by making them as energy efficient as possible. An energy efficient medium access control (MAC) can boost a WSN's lifetime. This research creates a MAC protocol called Adaptive sensor Medium Access Control (AMAC) which is based on Sensor Medium Access Control …

Microelectromechanical Systems (Mems) Interrupter For Safe And Arm Devices, Steven S. Mink

Theses and Dissertations

This thesis addresses the development of a new micro-scale interrupter mechanism for a safe and arm device used in modern weapon systems. The interrupter mechanism often consists of a physical barrier that prevents an initial source of energy, in an explosive train, from being transferred to subsequent charges. In general, when the physical barrier is removed, the weapon is considered armed, and the charge is allowed to propagate. Several issues facing current safe and arm devices systems are the shrinking industrial base for manufacturing these devices and the desire for modern safe and arm devices to be compatible with next …

Graphitized Carbon Foam With Phase Change Material, Angelinda D. Fedden

Theses and Dissertations

This thesis examines the transient heating and cooling responses of graphitized carbon foam infiltrated with phase change material (PCM). The carbon foam provides rapid heat transfer throughout the PCM volume, while the PCM stores the heat for later removal. The foam/PCM system was heated with a copper heating block, and then cooled with a liquid-cooled heat removal block. Infiltrating the foam with PCM significantly increased the length of time before the system reached maximum temperature. The temperature response of the foam/PCM system was consistent over multiple cycles of heating and cooling. A high density foam had a faster heating and …

The Effects Of Using Solar Radiation Pressure To Alleviate Fuel Requirements For Orbit Changing And Maintenance Of The Dscs Ii F-13 Satellite, Jody A. Paris

Theses and Dissertations

Orbit disposal and maintenance of aging satellites has become a significant concern over the past few years, as the increasing number of orbiting objects threatens to limit the launching of future satellites. Many of the satellites currently in orbit, however, were not built with disposal considerations. The DSCS II series was launched into orbit beginning in the 1970s, and many satellites are now without the fuel required to conventionally transition to a sanctioned disposal orbit. In GEO orbit the largest non-gravitational perturbation is solar radiation pressure. By adjusting the attitude of a satellite with a controller to maximize the perturbing …

Gauging The Commitment Of Clandestine Group Members, Doneda D. Downs

Theses and Dissertations

Since the attacks of September 11th, 2001, there has been a great deal of attention given to understanding the inner workings of terrorist organizations in order for the United States to be successful in the Global War on Terrorism. Group dynamics has been one area of interest pursued to gain more insight into a terrorist's cognitive battlespace. Until a few years ago, most research on individual commitment and organizational cohesion has been based primarily on questionnaires and open observations on groups that desire to be understood. However, terrorist organizations are clandestine; they constantly employ operations security (OPSEC) to ensure protection …

Power-Scavenging Mems Robots, Daniel J. Denninghoff

Theses and Dissertations

This thesis includes the design, modeling, and testing of novel, power-scavenging, biologically inspired MEMS microrobots. Over one hundred 500-μm and 990-μm microrobots with two, four, and eight wings were designed, fabricated, characterized. These microrobots constitute the smallest documented attempt at powered flight. Each microrobot wing is comprised of downward-deflecting, laser-powered thermal actuators made of gold and polysilicon; the microrobots were fabricated in PolyMUMPs® (Polysilicon Multi-User MEMS Processes). Characterization results of the microrobots illustrate how wing-tip deflection can be maximized by optimizing the gold-topolysilicon ratio as well as the dimensions of the actuator-wings. From these results, an optimum actuator-wing configuration was …

Characterization And Design Of High-Level Vhdl I/Q Frequency Downconverter Via Special Sampling Scheme, Jesse P. Somann

Theses and Dissertations

This study explores the characterization and implementation of a Special Sampling Scheme (SSS) for In-Phase and Quad-Phase (I/Q) down conversion utilizing top-level, portable design strategies. The SSS is an under-developed signal sampling methodology that can be used with military and industry receiver systems, specifically, United States Air Force (USAF) video receiver systems. The SSS processes a digital input signal-stream sampled at a specified sampling frequency, and down converts it into In-Phase (I) and Quad-Phase (Q) output signal-streams. Using the theory and application of the SSS, there are three main objectives that will be accomplished: characterization of the effects of input, …

Simulation Of Weapons Release From Cargo Aircraft, Paul M. Wilson

Theses and Dissertations

The purpose of this study is to develop a computer simulation capable of providing an accurate flight history of an air-dropped munitions dispenser system in order to conduct proof of concept testing. The simulation is intended to serve as an adaptable tool for the development and testing of any cargo aircraft based weapons dispenser system. The simulation allows the user to conduct low-cost, time efficient, and effective tests of various design concepts in determining their operational feasibility and performance envelope. The munitions dispenser system is intended to provide a retrofit combat capability to the USAF C-17 aircraft, delivering massive amounts …