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Articles 69091 - 69120 of 196803

Full-Text Articles in Engineering

The Impacts Of Using Augmented Reality To Support Aircraft Maintenance, Terry R. Hebert Jr. Mar 2019

The Impacts Of Using Augmented Reality To Support Aircraft Maintenance, Terry R. Hebert Jr.

Theses and Dissertations

The United States Air Force (USAF) expends significant resources to address the rise in aviation mishaps derived from an overworked, understaffed maintenance community, and high operational environment. Currently, paper-based technical orders (T.O.) are utilized by maintainers to accomplish aircraft inspections, servicing, and maintenance tasks. As technology advances, many civilian agencies have begun to leverage augmented reality (AR) to improve organizational proficiency. This research seeks to identify if the inclusion of AR within aircraft maintenance will positively or negatively affect maintenance task accuracy and completion time. A single variable randomized complete block design (RCBD), within-subject design of experiment (DOE) asses the …

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Exploratory Analysis Of The Potential Use Of Augmented Reality In Aircraft Maintenance, Richard B. Keesling Mar 2019

Exploratory Analysis Of The Potential Use Of Augmented Reality In Aircraft Maintenance, Richard B. Keesling

Theses and Dissertations

During the last decade manpower constraints and an aging fleet, along with sustained war time operating tempo, have combined to place a significant strain on the Air Force maintenance community. Recent technological advances have enabled Immersive Technology to be applied to industrial applications in the commercial sector. This has sparked interest within the Air Force and generated various initiatives seeking to enhance readiness through the application of Immersive Technology. This research explores how Immersive Technology can be applied within the maintenance community. Semi-structured interviews were conducted to determine where the maintenance community shortfalls exist, if the available technology has the …

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A Stochastic Game Theoretical Model For Cyber Security, Michael T. Larkin Mar 2019

A Stochastic Game Theoretical Model For Cyber Security, Michael T. Larkin

Theses and Dissertations

The resiliency of systems integrated through cyber networks is of utmost importance due to the reliance on these systems for critical services such as industrial control systems, nuclear production, and military weapons systems. Current research in cyber resiliency remains largely limited to methodologies utilizing a singular technique that is predominantly theoretical with limited examples given. This research uses notional data in presenting a novel approach to cyber system analysis and network resource allocation by leveraging multiple techniques including game theory, stochastic processes, and mathematical programming. An operational network security problem consisting of 20 tactical normal form games provides an assessment …

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Evaluation Of Guar Gum As A Novel Adsorbent, Philicia Geiser Mar 2019

Evaluation Of Guar Gum As A Novel Adsorbent, Philicia Geiser

Theses and Dissertations

Guar gum (GG) is a promising product increasingly used in a variety of industries. It is nontoxic, inexpensive, and biodegradable. This research evaluated novel approaches using GG as an adsorbent for aromatic organic water contaminants. The application of GG demonstrated some effectiveness against all contaminants tested. Two brands of GG were tested using 5 different GG treatment strategies. Various experiments demonstrated nearly complete removal of Allura Red dye, Brilliant Blue dye, Erythrosine B dye, Methylene Blue dye, Tartrazine dye, and 2,4-dinitrotoluene; additionally, 78% adsorption was observed for Fast Green dye. GG typically removed less than 10% of toluene, which rapidly …

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The Evaluation Of High Molecular Weight Methacrylate As A Treatment Option For Shrinkage Cracks In Airfield Pavement, Austin R. Hayes Mar 2019

The Evaluation Of High Molecular Weight Methacrylate As A Treatment Option For Shrinkage Cracks In Airfield Pavement, Austin R. Hayes

Theses and Dissertations

Air Force policy dictates that only epoxy can be used as a treatment option for shrinkage cracks in concrete airfield pavement. However, since epoxy is not ideal for shrinkage cracks, this research focuses on the evaluation of high molecular weight methacrylate (HMWM) as a treatment option. Laboratory experiments were performed on four sealants to determine whether they could penetrate a crack 24 inches deep, bond to the concrete, and resist water intrusion. Three HMWMs (TK-2415, Kwik Bond KBP 103, and Castek Transpo T-70) and one epoxy (TK-2110) were assessed. The four sealers were applied to 32 concrete specimens with crack …

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Electrochemical Modification Of Granular Activated Carbon And Carbon Nanofibers To Determine Effect On Adsorption, Jose E. Martinez Sanchez Mar 2019

Electrochemical Modification Of Granular Activated Carbon And Carbon Nanofibers To Determine Effect On Adsorption, Jose E. Martinez Sanchez

Theses and Dissertations

Granular activated carbon and carbon nanofiber samples were tested as is and electrochemically modified to determine the effect on adsorption. An electrochemical cell was used to modify the carbon samples. The samples were then used in bench bottle tests with 2,4-dinitrotoluene (DNT), brilliant blue (BB) dye, and methylene blue (MB) dye solutions and sampled over time intervals. An ultraviolet–visible spectrophotometer was used to analyze the results of the bottle bench tests. The results indicated that electrochemically modified coal-based carbons’ adsorption were improved 25% over the adsorption of the as is carbon samples prior to modification. The electrochemical modification increased adsorption …

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Analysis Of The Effect Of Corrosion On The Surface Chemistry Of Mild Steel Exposed To Biofuel, Timothy D. Plourde Mar 2019

Analysis Of The Effect Of Corrosion On The Surface Chemistry Of Mild Steel Exposed To Biofuel, Timothy D. Plourde

Theses and Dissertations

The use of biofuels in society is steadily becoming more prevalent. Through this proliferation a concern regarding the role of the fungus Byssochlamys nivea in microbially induced corrosion has surfaced. Through the use of X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope (SEM) technology, this thesis focused on attempting to determine what effect, if any, Byssochlamys nivea has on the corrosion of mild steel. For this analysis, samples were placed in environments that simulated the conditions of fuel tanks containing the biofuel B20, water, and spores of Byssochlamys nivea for varying lengths of time. However, due to a variety of …

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Product Development Process For Small Unmanned Aerial Systems, Jonathan D. Poole Mar 2019

Product Development Process For Small Unmanned Aerial Systems, Jonathan D. Poole

Theses and Dissertations

The DoD has recognized the need for persistent Intelligence, Surveillance and Reconnaissance (ISR) over the last two decades. Recent developments with commercial drones have changed the market structure; there is now a thriving and extensive market base for drone based remote sensing. This research provides system engineering methods to support the DoD use of this burgeoning market to meet operational ISR needs. The three contributions of this research are: a process to support Small Unmanned Aerial Systems (SUAS) design, tools to support the design process, and tools to support risk assessment and reduction for both design and operations. The process …

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United States Air Force Applications Of Unmanned Aerial Systems (Uas): A Delphi Study To Examine Current And Future Uas Autonomous Mission Capabilities, Alberto Sigala Mar 2019

United States Air Force Applications Of Unmanned Aerial Systems (Uas): A Delphi Study To Examine Current And Future Uas Autonomous Mission Capabilities, Alberto Sigala

Theses and Dissertations

As UAS technology continues to grow and enable increased autonomous capabilities, acquisition and operational decision makers must determine paths to pursue for existing and emerging mission areas. The DoD has published a number of 25-year unmanned systems integration roadmaps (USIR) to describe future capabilities and challenges. However, these roadmaps have lacked distinguishable stakeholder perspectives. Following the USIRs concept, this research focused on UAS autonomy through the lens of UAS subject matter experts (SMEs). We used the Delphi method with SMEs from USAF communities performing day-to-day operations, acquisitions, and research in UAS domains to forecast mission capabilities over the next 20 …

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Analysis And Design Of Modular Overhead Protection System Utilizing Readily Available Materials, Zachary J. Spranger Mar 2019

Analysis And Design Of Modular Overhead Protection System Utilizing Readily Available Materials, Zachary J. Spranger

Theses and Dissertations

This research investigated passive overhead protective measures for existing facilities in an urban environment that are vulnerable to enemy munitions fire. A new modular structural system was designed utilizing commercially available construction material consisting of structural tubing, scaffolding clamps, base plates, and simple roofing components. Structural analysis software was used to model nine modular structures to understand the relationship between the load bearing capacity of the structural members and overall dimensions of the system. Environmental variables for the models were set to the Parwan Province in Afghanistan; this region presents worst-case scenarios both for environmental factors and threat of enemy …

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Development Of A Mixed-Radiation Directional Rotating Scatter Mask Detection System, Bryan V. Egner Mar 2019

Development Of A Mixed-Radiation Directional Rotating Scatter Mask Detection System, Bryan V. Egner

Theses and Dissertations

Previous work demonstrated gamma-ray directional detection through the integration of a radiation detection system and an additively manufactured rotating scatter mask (RSM). This work advances the RSM directional detection system through improvements in the system's design, validation of a new scatter mask, and the novel ability to directionally detect both neutrons and gamma rays, a desirable feature for many nuclear safeguard and counterproliferation applications. The mixed-radiation RSM system developed for this research utilized the Spartan I mask design coupled with a 1" EJ-309 liquid scintillator. A GEome-try ANd Tracking (Geant4) model is developed and quantitatively compared to experimental measurements for …

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Search And Rescue Operations Forecasting And Optimization, Zachary T. Hornberger Mar 2019

Search And Rescue Operations Forecasting And Optimization, Zachary T. Hornberger

Theses and Dissertations

United States Coast Guard District 14 is responsible for the execution of eleven statutory missions across the Pacific region. Despite having the largest geographic area of responsibility (AOR), District 14 has command of among the fewest resources to accomplish these missions. When search and rescue (SAR) emergencies occur, these events take immediate priority because the ability to rapidly coordinate available assets can be the difference between saving or losing a life. Using historic records of SAR incidents for District 14, we leverage an approach called the stochastic zonal distribution model to evaluate spatiotemporal trends in emergency rates and response strategies …

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Examination Of Flow Dynamics And Passive Cooling In An Ultra Compact Combustor, Tylor C. Rathsack Mar 2019

Examination Of Flow Dynamics And Passive Cooling In An Ultra Compact Combustor, Tylor C. Rathsack

Theses and Dissertations

The Ultra Compact Combustor (UCC) promises to greatly reduce the size of a gas turbine engine’s combustor by altering the manner in which fuel is burnt. Differing from the common axial flow combustor, the UCC utilizes a rotating flow, coaxial to the engine’s primary axis, in an outboard circumferential cavity as the primary combustion zone. The present study investigates two key UCC facets required to further this combustor design. The first area of investigation is cooling of the Hybrid Guide Vane (HGV). This UCC specific hardware acts as a combustor center body that alters the exit flow angle and acts …

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Nanoparticle Synthesis For Glucose-Loaded Mesoporous Silica And Sucrose Hydrolysis Strategies For Bioanalyte Detection Applications Using A Personal Glucose Meter, Xiomar Emauel Bustos Perez Mar 2019

Nanoparticle Synthesis For Glucose-Loaded Mesoporous Silica And Sucrose Hydrolysis Strategies For Bioanalyte Detection Applications Using A Personal Glucose Meter, Xiomar Emauel Bustos Perez

USF Tampa Graduate Theses and Dissertations

Point-of-care (POC) tests are a reliable, portable, easy to use, and more affordable alternative to regular laboratory diagnostic tests. They bypass the necessity of expensive equipment, human labor, and technical expertise. The personal glucose meter (PGM) is a POC device that measures glucose levels in blood. Lately, the PGM have been used as a tool to detect other bioanalytes in different applications. There are two analytes which POC detection would be beneficial for patients: creatinine and tacrolimus. Creatinine is used to calculate glomerular filtration rate, a measurement of kidneys function that can help to diagnose kidney failure, and other nephropathies. …

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3d Printed Zeolite Monoliths For Co₂ Removal, Fateme Rezaei, Harshul V. Thakkar Mar 2019

3d Printed Zeolite Monoliths For Co₂ Removal, Fateme Rezaei, Harshul V. Thakkar

Chemical and Biochemical Engineering Faculty Research & Creative Works

Carbon dioxide (CO2) capture materials comprising one or more 3D-printed zeolite monoliths for the capture and or removal of CO2 from air or gases in enclosed compartments, including gases or mixtures of gases having less than about 5% CO2. Methods for preparing 3D-printed zeolite monoliths useful as CO2 capture materials and filters, as well as methods of removing CO2 from a gas or mixture of gases in an enclosed compartment using 3D-printed zeolite monoliths are provided.

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Simulation And Piloted Simulator Study Of An Automatic Ground Collision Avoidance System For Performance Limited Aircraft, James D. Carpenter Mar 2019

Simulation And Piloted Simulator Study Of An Automatic Ground Collision Avoidance System For Performance Limited Aircraft, James D. Carpenter

Theses and Dissertations

The F-16 Automatic-Ground Collision Avoidance System (Auto-GCAS) has been a resounding success since implementation in Nov 2014, saving 8 pilots and 7 aircraft from Controlled Flight into Terrain (CFIT). However, there is no implemented Auto- GCAS for "heavy" performance limited aircraft. This research endeavors to expand on the success of F-16 Auto-GCAS to other aircraft in the Air Force inventory such as the C-130, C-17, and B-1. MIL-STD-1797 classifies performance limited aircraft as large, heavy, and low to medium maneuverability. Using a stitched Learjet-25D model (LJ-25D), an Auto-GCAS algorithm was developed to predict multiple escape-maneuver trajectories, compare these paths to …

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Analytical Models And Control Design Approaches For A 6 Dof Motion Test Apparatus, Kyra L. Schmidt Mar 2019

Analytical Models And Control Design Approaches For A 6 Dof Motion Test Apparatus, Kyra L. Schmidt

Theses and Dissertations

Wind tunnels play an indispensable role in the process of aircraft design, providing a test bed to produce valuable, accurate data that can be extrapolated to actual flight conditions. Historically, time-averaged data has made up the bulk of wind tunnel research, but modern flight design necessitates the use of dynamic wind tunnel testing to provide time-accurate data for high frequency motion. This research explores the use of a 6 degree of freedom (DOF) motion test apparatus (MTA) in the form of a robotic arm to allow models inside a subsonic wind tunnel to track prescribed trajectories to obtain time-accurate force …

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Wall Model Large Eddy Simulation Of A Diffusing Serpentine Inlet Duct, Ryan J. Thompson Mar 2019

Wall Model Large Eddy Simulation Of A Diffusing Serpentine Inlet Duct, Ryan J. Thompson

Theses and Dissertations

The modeling focus on serpentine inlet ducts (S-duct), as with any inlet, is to quantify the total pressure recovery and ow distortion after the inlet, which directly impacts the performance of a turbine engine fed by the inlet. Accurate prediction of S-duct ow has yet to be achieved amongst the computational fluid dynamics (CFD) community to improve the reliance on modeling reducing costly testing. While direct numerical simulation of the turbulent ow in an S-duct is too cost prohibitive due to grid scaling with Reynolds number, wall-modeled large eddy simulation (WM-LES) serves as a tractable alternative. US3D, a hypersonic research …

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Quantifying Resiliency Risk Metrics Through Facility Dispersion, Branden D. Delong Mar 2019

Quantifying Resiliency Risk Metrics Through Facility Dispersion, Branden D. Delong

Theses and Dissertations

During the last century, airbases were attacked at least 26 times in an effort to destroy the enemy at its base. Attacks on military airbases impose prohibitive losses to critical infrastructure, which in turn impacts the maintenance of air power projection. The primary enemy threat facing critical infrastructure today is the use of ballistic and land-attack cruise missiles to disrupt an airbase’s ability to launch and recover aircraft. Over the last decade, ballistic and cruise missile technology has grown to allow the world’s most powerful countries to achieve a nascent threat to forward operating bases used in theater security campaigns …

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Search-Based Vs. Task-Based Space Surveillance For Ground-Based Telescopes, Fred D. Hertwig Mar 2019

Search-Based Vs. Task-Based Space Surveillance For Ground-Based Telescopes, Fred D. Hertwig

Theses and Dissertations

Persistent Space Situational Awareness (SSA) is one of the top priorities of the DoD. Currently the Space Surveillance Network (SSN) operates using only a task-based method. The goal of this thesis was to compare the current task-based space surveillance performance to a search-based method of space surveillance in the GEO belt region. The performance of a ground telescope network, similar to the Ground-Based Electro-Optical Deep Space Surveillance (GEODSS) network, was modeled and simulated using AGI’s Systems Tool Kit (STK) and Python. The model compared search-based and task-based space surveillance methods by simulating 813 Resident Space Objects (RSOs) on the summer …

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The Effects Of Reactant Concentration And Air Flow Rate In The Consumption Of Dissolved O2 During The Photochemistry Of Aqueous Pyruvic Acid, Alexis J. Eugene, Marcelo I. Guzman Mar 2019

The Effects Of Reactant Concentration And Air Flow Rate In The Consumption Of Dissolved O2 During The Photochemistry Of Aqueous Pyruvic Acid, Alexis J. Eugene, Marcelo I. Guzman

Chemistry Faculty Publications

The sunlight photochemistry of the organic chromophore pyruvic acid (PA) in water generates ketyl and acetyl radicals that contribute to the production and processing of atmospheric aerosols. The photochemical mechanism is highly sensitive to dissolved oxygen content, [O2(aq)], among other environmental conditions. Thus, herein we investigate the photolysis (λ ≥ 305 nm) of 10–200 mM PA at pH 1.0 in water covering the relevant range 0 ≤ [O2(aq)] ≤ 1.3 mM. The rapid consumption of dissolved oxygen by the intermediate photolytic radicals is monitored in real time with a dissolved oxygen electrode. …

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Control Strategies For Multi-Evaporator Vapor Compression Cycles, Sunderlin D. Jackson Mar 2019

Control Strategies For Multi-Evaporator Vapor Compression Cycles, Sunderlin D. Jackson

Theses and Dissertations

Next-generation military aircraft must be able to handle highly transient thermal loads that exceed the ability of current aircraft thermal subsystems. Vapor compression cycle systems are a particular refrigeration technology that is an attractive solution for dealing with this challenge, due primarily to their high efficiency. However, there are several barriers to realizing the benefits of vapor cycles systems for controlling thermal loads in military aircraft. This thesis focuses on addressing the challenge of controlling vapor cycles in the presence of highly transient evaporator heat loads. Specifically, a linear quadratic regulator (LQR) is designed for a simple vapor cycle system, …

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Comprehensive Study Of Study Of Optimal Synergetic Skip Entries With Dynamic Thrust Vectoring Control, Jeremiah M. Webb Mar 2019

Comprehensive Study Of Study Of Optimal Synergetic Skip Entries With Dynamic Thrust Vectoring Control, Jeremiah M. Webb

Theses and Dissertations

The atmospheric skip entry has been studied since London's presentation in 1962 describing a more fuel efficient means of altering the orbital inclination of satellites. Since London, research over the decades since has traversed many aspects of this field with varying degrees of success. The present research employs the use of modern optimal control software, complex dynamics with minor simplifications, and thrust vectoring to re-approach the aerocruise atmospheric skip entry. Using the aerodynamics of the X-34, the aerocruise problem is first compared to the un-powered aeroglide where it is shown that the aerocruise is capable of increasing the inclination change …

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Computational Aerothermodynamic Analysis Of Satellite Trans-Atmospheric Skip Entry Survivability, John J. Runco Mar 2019

Computational Aerothermodynamic Analysis Of Satellite Trans-Atmospheric Skip Entry Survivability, John J. Runco

Theses and Dissertations

Computational aerothermodynamic analysis is presented for a spacecraft in low Earth orbit performing an atmospheric skip entry maneuver. Typically, atmospheric reentry is a terminal operation signaling mission end-of-life and, in some instances, executed for spacecraft disposal. A variation on reentry – skip entry – is an aeroassisted trans-atmospheric maneuver in which a spacecraft utilizes the effects of aerodynamic drag in order to reduce energy prior to a terminal entry, pinpoint a targeted entry, or change orbital elements such as inclination. Spacecraft performing a skip entry enable new modes of maneuver to enhance operations in nominal or possibly contested mission environments. …

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Characterization And Anomalous Diffusion Analysis Of A 100w Low Power Annular Hall Effect Thruster, Megan N. Maikell Mar 2019

Characterization And Anomalous Diffusion Analysis Of A 100w Low Power Annular Hall Effect Thruster, Megan N. Maikell

Theses and Dissertations

A Busek 100W low-power annular Hall effect thruster was characterized to determine the thruster’s best operating parameter range and to study plasma oscillations within the thruster. These experiments were conducted using xenon gas in the Space Propulsion Analysis and System Simulator chamber at the Air Force Institute of Technology on Wright-Patterson Air Force Base. The thruster’s performance characteristics were evaluated at nominal discharge voltages and constant total mass flow rate, solenoid current, and keeper current to determine the operating conditions optimizing divergence angle, beam efficiency, and discharge loss. This was accomplished using a Faraday probe to determine the plume’s current …

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Limited-Duty-Cycle Satellite Formation Control Via Differential Drag, Talon A. Townley Mar 2019

Limited-Duty-Cycle Satellite Formation Control Via Differential Drag, Talon A. Townley

Theses and Dissertations

As CubeSat formation flying missions relying on differential drag control become increasingly common, additional missions based on this control must be studied. A mission planning tool is investigated to control the relative spacing of a CubeSat formation where differential drag is the sole control mechanism. System performance is investigated under varying perturbations and a range of system parameters, including limiting the control duty cycle. Optimal solutions based on using a pseudo spectral numerical solver, GPOPS-II, to minimize maneuver time. This study includes the development of a mission planning tool to work with the modeled CubeSat mission to calculate optimal maneuvers …

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Comparison Of Novel Heuristic And Integer Programming Schedulers For The Usaf Space Surveillance Network, Kanit Dararutana Mar 2019

Comparison Of Novel Heuristic And Integer Programming Schedulers For The Usaf Space Surveillance Network, Kanit Dararutana

Theses and Dissertations

Space is a highly congested and contested domain begetting the importance of prioritizing the Space Situational Awareness (SSA) mission. With increased dependence on space assets, scheduling and tasking of the Space Surveillance Network (SSN) is vitally important to maintaining space dominance. According to the 2004 USSTRATCOM Strategic Directive 505-1 (SD 505-1) the SSN uses centralized tasking, with decentralized scheduling. Enhancing SSA within available resources is paramount, and the development of a centralized SSN scheduler to maximize performance is crucial. This research develops and compares novel scheduling models to a model reflecting the 2004 SD 505-1. Novel schedulers were developed to …

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Analysis Of Military Construction Cost Growth In Major Defense Acquisition Programs, Emily E. Angell Mar 2019

Analysis Of Military Construction Cost Growth In Major Defense Acquisition Programs, Emily E. Angell

Theses and Dissertations

This study is an exploratory analysis combining military construction (MILCON) data from the Selected Acquisition Reports (SAR) of Major Defense Acquisition Programs (MDAP) with the associated Automated Civil Engineer System project actual costs. The analysis uses both descriptive and inferential statistics to identify cost growth of MILCON at the programmatic level as well as to bridge the gap between SAR estimates and actual project costs within those program-level estimates. Overall, programs experience more negative growth (cost savings) in MILCON estimates on SARs, typically less than 0.2% of the total program cost implying minimal impact to program decisions. Estimates got more …

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Assessing Artificial Agent Response Time Effects On Human-Agent Teams In Variable Inter-Arrival Time Environments, David J. Canzonetta Mar 2019

Assessing Artificial Agent Response Time Effects On Human-Agent Teams In Variable Inter-Arrival Time Environments, David J. Canzonetta

Theses and Dissertations

Autonomous systems have gained an expanded presence within the Department of Defense (DoD). Furthermore, the DoD has clearly stated autonomous systems must extend the capabilities of their human operators. Thus, the exploration of strategies for effective pairing of humans and automation supports this vision. Previous research demonstrated that the time at which an automated agent assumes a task for its human teammate, or agent response time (ART), affects human-agent team performance, human engagement, and human workload. However, in this research environment, the time between subsequent tasks appearing to the human-agent team, or inter-arrival time (IAT), remained constant. Variable IAT environments …

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Methodology For Including Base Infrastructure In Conceptual System Analysis, Patrick J. Kelly Iv Mar 2019

Methodology For Including Base Infrastructure In Conceptual System Analysis, Patrick J. Kelly Iv

Theses and Dissertations

The 2018 National Defense Strategy defines a transition to agile basing, where the logistics footprint of new conceptual systems can be distributed across a set of airfields, instead of one main operating base. Currently, there is no capability to assess early concepts using airfield data. This research develops a methodology and a tool that assesses system concepts using world-wide civil and military airfield infrastructure, such as runway parameters, parking, munitions, fuel and warehouse storage, and distance to areas of interest. Specifically, the focus of the thesis is on concepts for the Intelligence, Surveillance, and Reconnaissance (ISR) Strike mission. Four concepts …

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