LIBROS DEL AUTOR: air force institute of technology u s

100 resultados para LIBROS DEL AUTOR: air force institute of technology u s

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  • A Wide Area Bipolar Cascade Resonant Cavity Light Emitting Diode for a Hybrid Range-Intensity Sensor
    Reginald J. Turner / Air Force Institute of Technology (U.S.)
    This dissertation focused on the development of an illuminator for the HRIS. This illuminator enables faster image rendering and reduces the potential of errors in return signal data, that could be generated from extremely rough terrain. Four major achievements resulted from this work, which advance the field of 3-D image acquisition. The first is that the TJ is an effective cu...
    Disponible

    20,97 €

  • Using Predictive Rendering as a Vision-Aided Technique for Autonomous Aerial Refueling
    Adam D. Weaver / Air Force Institute of Technology (U.S.)
    This research effort seeks to characterize a vision-aided approach for an Unmanned Aerial System (UAS) to autonomously determine relative position to another aircraft in a formation, speci cally to address the autonomous aerial refueling problem. A system consisting of a monocular digital camera coupled with inertial sensors onboard the UAS is analyzed for feasibility of using ...
    Disponible

    17,69 €

  • Investigation Into the Adaptation of a Stream Injector for Use on a Liquid Rock Engine
    Charles B. Mcfarland / Air Force Institute of Technology (U.S.)
    This thesis investigated the properties of a steam injector to see if the concept might be suitable for use on a liquid rocket engine. A steam injector is a device developed in the 1850’s and was used to inject feedwater into the boiler on a steam locomotive without any moving parts. The injectors used a small portion of the steam generated in the boiler to increase the pressur...
    Disponible

    17,44 €

  • Inertia Measurement and Dynamic Stability Analysis of a Radio-Controlled Joined-Wing Aircraft
    William A. McClelland / Air Force Institute of Technology (U.S.)
    Dynamic stability and stall during steady level turns were examined for VA-1, a joined-wing flight demonstrator aircraft. Configurations with a lower vertical tail and fairings over the main landing gear were compared with a recommendation on the combination had the best drag and dynamic stability characteristics. The dynamic stability analysis was broken into four key parts: a...
    Disponible

    20,18 €

  • Backward Amplification and Beam Cleanup of a Raman Fiber Laser Oscillator Using a Multi-Mode Graded Index Fiber Amplifier
    Jesse D. S. Morgan / Air Force Institute of Technology (U.S.)
    This thesis tested a CW fiber-based Raman amplifier implemented in a backward pumped geometry. To create a seed for the amplifier, a CW Nd:YAG laser operating at 1.064??m was used to pump a 50??m multimode graded index fiber using fiber Bragg gratings to create a Raman Fiber Laser (RFL) Oscillator with a Stokes beam at 1.116??. The Stokes beam was then used to seed two lengths,...
    Disponible

    17,33 €

  • A Simulation-Based Analysis of the Impact of In-Sourcing a Major Process Element on the Coast Guard HH-60J Depot Maintenance Process
    Steven E. Vigus / Air Force Institute of Technology (U.S.)
    Leaders at the United States Coast Guard’s Aircraft Repair and Service Center (ARSC) in Elizabeth City, North Carolina recently formalized their planning and analysis functions by adding a dedicated branch to their command structure. The Planning and Analysis Branch intends to apply computer modeling and simulation to study the impact of process changes to the various Programme...
    Disponible

    17,47 €

  • Evolution of Control Programs for a Swarm of Autonomous Unmanned Aerial Vehicles
    Kevin M. Milam / Air Force Institute of Technology (U.S.)
    Unmanned aerial vehicles (UAVs)are rapidly becoming a critical military asset. In the future, advances in miniaturization are going to drive the development of insect sizeU AVs. New approaches to controlling these swarms are required. The goal of this research is to develop a controller to direct a swarm of UAVs in accomplishing a given mission. While previous efforts have larg...
    Disponible

    20,09 €

  • A Greedy Multiple-Knapsack Heuristic for Solving Air Mobility Command’s Intratheater Airlift Problem
    Nicholas J. Zeisler / Air Force Institute of Technology (U.S.)
    This research develops a methodology using a greedy heuristic to solve Air Mobility Command’s intratheater airlift scenario as a multiple knapsack problem. The objective is to maximize throughput in a theater given a vehicle mixture and assignment scheme. The model allows for a heterogeneous, user defined vehicle mix in a theater consisting of up to five bed down locations and ...
    Disponible

    17,17 €

  • A Hybrid Communications Network Simulation-Independent Toolkit
    David M. Dines / Air Force Institute of Technology (U.S.)
    Net-centric warfare requires information superiority to enable decision superiority, culminating in insurmountable combat power against our enemies on the battlefield. Information superiority must be attained and retained for success in today’s joint/coalition battlespace. To accomplish this goal, our combat networks must reliably, expediently and completely deliver over a wide...
    Disponible

    17,33 €

  • A Study of Near Field Data Transformed to the Far Field for a Canonical PEC Scatterer
    E. Cady / Air Force Institute of Technology (U.S.)
    The purpose of this research was to analyze the error associated with the Image Based Near Field to Far Field Transformation (IB NFFFT) for a canonical perfectly electrically conductive (PEC) scatterer. This research compares two groups of data: far field RCS predicted by the IB NFFFT and far field RCS predicted by X-Patch. The IB NFFFT requires a complete set of calibrated mon...
    Disponible

    17,78 €

  • Modeling Biodegradation of Chlorinated Groundwater Contaminants Under Iron-Reducing Conditions of a Constructed Wetland
    Max E. Johnson / Air Force Institute of Technology (U.S.)
    The purpose of this study is to determine and explore the fundamental processes associated with biodegradation of chlorinated ethenes in iron-reducing conditions of a constructed wetland and to evaluate the impacts of changing conditions (both natural and engineer-controlled) on the system. The modeler uses a system dynamics approach to construct a model that represents behavio...
    Disponible

    23,10 €

  • Analysis of a Rumor Routing Protocol With Limited Packet Lifetimes
    Peter R. Francik / Air Force Institute of Technology (U.S.)
    Wireless sensor networks require specialized protocols that conserve power and minimize network traffic. Therefore, it is vitally important to analyze how the parameters of a protocol affect these metrics. In doing so, a more efficient protocol can be developed.This research evaluates how the number of nodes in a network, time between generated agents, lifetime of agents, numbe...
    Disponible

    17,63 €

  • Computational Analysis of Geometric Effects on Strut Induced Mixing in a Scramjet Combustor
    Matthew G. Bagg / Air Force Institute of Technology (U.S.)
    In order to increase the fuel-air mixing in a scramjet combustion section, the Air Force Institute of Technology and the Air Force Research lab investigated methods to increase the mixing efficiency. Previous experimental work identified the advantages of using a strut upstream of a cavity flame holder to increase the fuel-air mixture. In this paper a computational investigatio...
    Disponible

    17,44 €

  • Unmanned Tactical Airlift
    Jason T. Williams / Air Force Institute of Technology (U.S.)
    Much literature has been published on unmanned aircraft in general, particularly in the roles of intelligence, surveillance, and reconnaissance (ISR) as well as attack. Less has been written on the use of unmanned aircraft in mobility roles. What has been written was form a strategic airlift perspective and air refueling. Virtually nothing, however, has been published on unmann...
    Disponible

    17,53 €

  • Reverse Geographic Location of a Computer Node
    Clinton G. Carr / Air Force Institute of Technology (U.S.)
    he determination of methods by which a user is able to locate his computer when that user does not know his current location, termed 'homestation', will provide the Air Force an advantage over its adversaries. The methods are a combination of different mathematical techniques that enable the user to manipulate data to minimize the effects of delay caused by various factors on t...
    Disponible

    17,80 €

  • Implementation and Validation of a Real-time Wireless Non-invasive Physiological Monitoring System in a High-G Environment
    H. Akcivi / Air Force Institute of Technology (U.S.)
    The overall purpose of this research is to develop a system capable of real-time personal positioning and physiological monitoring. The system will be composed of a shirt having non-invasive physiological sensors, Global Positioning System (GPS) receiver, wireless data transceiver, and real-time PC-based control station. The specific purpose of this research phase was to determ...
    Disponible

    20,21 €

  • Optimal Periodic Inspection of a Stochastically Degrading System
    Timothy B. Booher / Air Force Institute of Technology (U.S.
    This thesis develops and analyzes a procedure to determine the optimal inspection interval that maximizes the limiting average availability of a stochastically degrading component operating in a randomly evolving environment. The component is inspected periodically, and if the total observed cumulative degradation exceeds a fixed threshold value, the component is instantly repl...
    Disponible

    20,06 €

  • Boundary Layer Control of a Circular Cylinder Using a Synthetic Jet
    Christopher K. Smith / Air Force Institute of Technology (U.S.
    Active control of flow around a circular cylinder at a sub-critical Reynolds number was studied experimentally. The flow was controlled by using a synthetic jet which ran span wise along the cylinder and emanated radially from the cylinder. The experiments were conducted over a two dimensional cylinder in a water tunnel at a Reynolds number of approximately 5800. Seven differen...
    Disponible

    17,78 €

  • A Component Based Approach to Agent Specification
    David J. Robinson / Matthew P. Neumeyer / Air Force Institute of Technology (U.S.)
    The Air Force, as well as all of industry, is currently faced with the problem of having to produce larger and more complex software systems that run efficiently and reliably as well as being extensible and maintainable. This research addresses this problem by developing a knowledge representation language that can be used to unambiguously specify and design software systems in...
    Disponible

    21,10 €

  • Beyond A-76
    Kurt A. Chelf / Air Force Institute of Technology (U.S.)
    The Department of Defense (DoD) has determined that Outsourcing and Privatization is key to reducing operating costs and subsequently providing the fiscal dollars necessary to modernize the U.S. Armed Forces. In an effort to achieve this goal, the DoD has mandated that the Air Force stud y at least 5% of its manning positions for possible conversion to contract (A-76 Contractin...
    Disponible

    17,80 €

  • A Prediction Code for the Thrust Performance of Two-Dimensional, Non-Axisynnetric, Converging Diverging Nozzles
    Angela M. Geatz / Air Force Institute of Technology (U.S.)
    The objective of this research is to develop a prediction code for the Air Force Research Laboratory Propulsion Directorate that can accurately determine the gross thrust coefficient for a user defined non-axisymmetric two-dimensional converging diverging nozzle. The code includes the effects of friction, angularity, and expansion losses on nozzle efficiency. To demonstrate the...
    Disponible

    20,18 €

  • Characterization of Upstream Mixing Cavities and a Downstream Combustion Cavity in Supersonic Flow
    Adam P. Quick / Air Force Institute of Technology (U.S.)
    A key area of study in air-breathing hydrocarbon-fueled scramjet combustors is the characterization of cavity-based fuel injection and flame holding. One issue concerns oscillatory disturbances caused by trapped vortices in the main flame holder cavity as a fuel-air mixing enhancement technique. Previous research demonstrates that oscillatory disturbances can be carried downstr...
    Disponible

    20,12 €

  • Store Separations From a Supersonic Cone
    Richard J. Simko / Air Force Institute of Technology (U.S.)
    The purpose of this research was to analyze the environment a store would travel through if ejected from a supersonic cone. This was done using the Beggar Computational Fluid Dynamics (CFD) code from the Air Force SEEK Eagle Office at Eglin Air Force Base, FL. CFD simulations were compared to experimental results from a previous AFIT thesis and conclusions were drawn based on w...
    Disponible

    20,22 €

  • Establishment of a System Operating Characteristic for Autonomous Wide Area Search Vehicles
    Brian A. Kish / Air Force Institute of Technology (U.S.)
    Analytic system effectiveness measures are derived using applied probability theory. The effectiveness measures handle time-varying parameters which characterize the battle space environment and the performance of the system. This allows the formulation and solution of optimization problems that maximize the probability of target attacks while at the same time constraining the ...
    Disponible

    21,12 €

  • A Primer and Guide to Modeling for Operators
    Juris L. Jansons / Air Force Institute of Technology (U.S.)
    Operators rely more and more on models to accomplish their work; examples include the weapons employment zone displays in cockpits, logistics models for deployment, and battle simulations to decide courses of action. They often do not have much exposure to modeling, and the products they are using do not always supply adequate documentation. The first portion of this paper serv...
    Disponible

    17,60 €

  • Performance and Operability of a Dual Cavity Flame Holder in a Superonsic Combustor
    Mackenzie J. Collatz / Air Force Institute of Technology (U.S.)
    The current generation of hydrocarbon fueled scramjet combustors typically requires a flame holding device to facilitate flame ignition and stable combustion. The amount of time available for fuel injection, fuel-air mixing, and combustion is very short, on the order of 1 millisecond. This short dwell time, along with the relatively long ignition delay times of hydrocarbon fuel...
    Disponible

    17,60 €

  • A Confidence Paradigm for Classification Systems
    Nathan J. Leap / Air Force Institute of Technology (U.S.
    There is no universally accepted methodology to determine how much confidence one should have in a classifier output. This research proposes a framework to determine the level of confidence in an indication from a classifier system where the output is or can be transformed into a posterior probability estimate. This is a theoretical framework that attempts to unite the viewpoin...
    Disponible

    20,98 €

  • Removal of Cyclohexane From a Contaminated Air Stream Using a Dense Phase Membrane Bioreactor
    Michael G. Roberts / Air Force Institute of Technology (U.S.
    The purpose of this research was to determine the ability of a dense phase membrane bioreactor to remove cyclohexane, a volatile organic compound in JP-8 jet fuel, from a contaminated air stream using a biologically active film for degradation. The research answered questions regarding applications of membrane bioreactors, the ability of cyclohexane to diffuse through a dense p...
    Disponible

    20,21 €

  • Cold-Flow Testing of a Subscale Model Exhaust System for a Space-Based Laser
    Ian S. Bautista / Air Force Institute of Technology (U.S.)
    The purpose of this research was to continue a study of gas-dynamic phenomena that occurred in stacked cylindrical rings of nozzles and an exhaust manifold as reported by Captain Scott Bergren in 2002. The rings and exhaust manifold were part of a 1/5- scale model of one quadrant of the conceptual Space Based Laser Integrated Flight Experiment (SBL IFX) gas dynamic laser. This ...
    Disponible

    20,22 €

  • A Formal Methodology and Technique for Verifying Conversations in a Closed Multi-Agent System
    Timothy H. Lacey / Air Force Institute of Technology (U.S.)
    As network bandwidth increases, distributed applications are becoming increasing lyprevalent. Systems using these applications are very complicated to build and must be dependable. Software agents are ideal for breaking complicated problems into manageable subtasks. Agent conversations, a series of messages passed between agents, are the cornerstone of multi-agent systems and m...
    Disponible

    17,69 €


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