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Articles 1 - 30 of 154
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Applications In Multi-Band Isolation Of Spectra With Data-Adaptive Sub-Banding (Midas): Using Multi-Criteria Decision Analysis To Optimize Midas-Based De-Noising Methods When Processing Infrasound And Other Signals Of Interest, Everett Raymond Coots
Theses and Dissertations
The ever-present challenge faced by the signal processing analyst is to get more from the available data, whether it be exploiting the same data in new ways to garner new information, or simply to increase the confidence in existing qualitative metrics. Traditional techniques include filtering (to improve the signal to noise ratio of detected signals or images or to isolate and possibly remove interfering signals), feature detection/extraction (identifying key characteristics within the signal) and signal decomposition (identification of dominant signals of interest relative to noise terms). Current research by our team began with an emphasis on the filtering of signals …
A Joint Soft Warping And Clustering Approach To Detecting Time Series Anomalies, Christopher John Schuchmann
A Joint Soft Warping And Clustering Approach To Detecting Time Series Anomalies, Christopher John Schuchmann
Theses and Dissertations
Unsupervised anomalous time series detection methods focus on identifying outliers without prior knowledge of the dataset. However, these methods often require multiple parameters to be optimized, with adequate performance tied to their careful tuning and prior domain knowledge. In this work, two methods are proposed for detecting outlier time series that adopt a joint clustering and alignment optimization to filter out the desired signals. The time series are globally clustered while simultaneously being aligned to other signals in their same cluster group. This alternating optimization employs time-warping similarity measures to help identify closely matching time series as well as the …
Shared Leadership Emergence: The Role Of Leader Identity And Leadership Structure Schema, Erica Medrano
Shared Leadership Emergence: The Role Of Leader Identity And Leadership Structure Schema, Erica Medrano
Theses and Dissertations
The increasing popularity of self-managing teams has sparked interest in the impact of shared leadership structures on team outcomes. Yet, it is unclear how shared leadership structures form or why they vary across teams. While research suggests that leadership claiming and granting are essential to the social construction of shared leadership in teams, the latter has received little attention. Therefore, this study aimed to address the fundamental questions “what factors determine who is granted leadership by individuals in a team?” and “what factors determine how many others are granted leadership by individuals in a team?” I proposed that leader identity …
Flow Choice Architecture: Cognitive Augmentation Of Knowledge Workers, Troy Ricardo Weekes
Flow Choice Architecture: Cognitive Augmentation Of Knowledge Workers, Troy Ricardo Weekes
Theses and Dissertations
The Flow Choice Architecture (FCA) is a biofeedback-based behavior modification tool that was designed for operation by human knowledge workers (KWs) before, during, and after the performance of work tasks. FCA utilizes human-aware artificial intelligence (AI) that senses patterns in its operator’s bio-signals to derive their cognitive and affective states. The states are contextualized using relevant information about the operator, task, and work timeline. The contextualized operator states are then used to recommend effective nudges that orient the human KW towards the flow state. This dissertation outlines the state-of-the-art on flow, neurofeedback, and AI then explains how FCA was designed, …
Socio-Economic Variables And Their Relationships With The Passenger To Population Ratio, Jack Matthew Westbury
Socio-Economic Variables And Their Relationships With The Passenger To Population Ratio, Jack Matthew Westbury
Theses and Dissertations
As the aviation industry expands and becomes commonplace in the modern world, it would behoove us to understand how the industry develops and passenger to population ratio could be a measure of that development. If called upon to identify how the aviation industry develops, one could only make suggestions as to which variables might be key in the development of the aviation industry. This study used existing socio-economic and population data from the United Nations and passenger information from the International Air Transport Association, with the aim to deepen the understanding of the relationship between socio-economic variables and the passenger …
Teacher Choice-Allocation Of Delayed Treatment Outcomes Based On Severity Of Student Problem Behavior, Natalia Victoria Colón
Teacher Choice-Allocation Of Delayed Treatment Outcomes Based On Severity Of Student Problem Behavior, Natalia Victoria Colón
Theses and Dissertations
Delay discounting is the systematic preference for smaller, sooner rewards over larger, later rewards, particularly as the delay to the larger, later reward is increased. It is used to explain impulsivity. Monetary rewards have been most frequently studied; however, impulsivity has also been represented with behavioral treatment outcomes for maladaptive behavior where a caregiver is responsible for its implementation (Call et al., 2015; Scheithauer et al., 2020). Maladaptive behavior is a common concern among families with autism spectrum disorder (ASD). Long-term improvements are not uncommon in behavior analysis. It may be detrimental to client gains if caregivers discount longer acting …
Brevity Vs. Breadth: Can Memory Disorders Be Diagnosed Using Fewer Neuropsychological Assessments?, Analise Roccaforte
Brevity Vs. Breadth: Can Memory Disorders Be Diagnosed Using Fewer Neuropsychological Assessments?, Analise Roccaforte
Theses and Dissertations
Object: The present study examines the clinical utility of combining a cognitive screener, Montreal Cognitive Assessment (MoCA), with a measure of adaptive functioning, Texas Functional Living Scale (TFLS), to diagnose memory disorders when differentiating between cognition within normal limits (WNL), mild cognitive impairment (MCI), and Alzheimer’s disease (AD). Method: A total of 207 Health First Memory Disorder Clinic patients, ages 64-94, were included in the study. Participants were screened using the MoCA and then they completed a brief neuropsychological evaluation, which included the TFLS. Participants were only included if they received a diagnosis of cognition WNL, MCI, or AD. They …
Beyond Resource Depletion: An Examination Of Sleepiness, Self-Regulation, And Goal Progress, Kauyer Lor
Beyond Resource Depletion: An Examination Of Sleepiness, Self-Regulation, And Goal Progress, Kauyer Lor
Theses and Dissertations
Research on employee sleepiness and self-regulation has primarily adopted a resource depletion perspective. However, other theoretical frameworks suggest additional processes may be involved. The current study explored this idea by examining the relationship between sleepiness, self-regulation, and goal progress within an integrative self-control theoretical framework (Kotabe & Hofmann, 2015). This study included a sample of 127 employees recruited from Amazon’s Mechanical Turk and a snowball method through social media. Participants completed seven signal surveys within a single workday assessing sleepiness, desire, higher-order goal, control capacity, control motivation, self-control enactment, desire enactment, and goal progress. Results from multilevel modeling indicated that …
Assessment Of The Skeletonization And Motion Monitoring System For The Security Efficiency Of The United States Airports, Haoruo Fu
Theses and Dissertations
The screening processes at airports, including passengers and baggage, have changed dramatically in the past twenty years. The goal of the X-ray scanning is to enhance airport screening by preventing passengers from carrying weapons and contraband. X-ray is more effective compared to traditional pat-down. The X-ray shoots beams through passengers and their baggage, which provides an inner view to the Transportation Security Administration (TSA) screeners. Issues and concerns of the use of X-ray have also been raised, as some passengers complained about possible health issues due to the body exposure of radioactive waves; other experts pointed out possible human factor …
Examining The Safety Climate Of A General Aviation Maintenance, Repair, And Overhaul (Mro) Organization: A Replication Study And Application Of Bandura’S Reciprocal Causation Model, Russell Vincent Tokarski
Examining The Safety Climate Of A General Aviation Maintenance, Repair, And Overhaul (Mro) Organization: A Replication Study And Application Of Bandura’S Reciprocal Causation Model, Russell Vincent Tokarski
Theses and Dissertations
The primary purpose of this study was to examine the safety climate of a general aviation original equipment manufacturer maintenance, repair, and overhaul (MRO) facility relative to Fogarty’s (2005) and Uhuegho’s (2017) respective empirically-derived safety climate path models, and Bandura’s (1977) theoretical reciprocal causation model. The study used an explanatory correlational design, and the primary data collection instrument was Uhuegho’s Aviation Maintenance Safety Climate Survey, which consisted of Fogarty’s 48-item Maintenance Environment Survey and Goldberg and Williams’ (1988) 12-item General Health Questionnaire. The target population was all aviation maintenance technicians employed at the targeted MRO’s U.S. facilities, which complete scheduled/unscheduled …
Crashworthiness Of Metallic Tubes Under Off-Axial Loading, Victor Manuel Bautista Katsalukha
Crashworthiness Of Metallic Tubes Under Off-Axial Loading, Victor Manuel Bautista Katsalukha
Theses and Dissertations
Energy absorbing structures (EAS) are structures used to make the frame of a vehicle absorb energy during an impact scenario and keep the deceleration forces within survivable limits for the occupant(s). These structures are found in all sorts of vehicles, such as cars, helicopters, airplanes, etc., and come in many types of shapes (circular, square, triangular tubes and flat or curved plates) and materials (metals and composites). In this thesis, 304 Stainless Steel tubes with circular and square cross-sections are investigated when subject to off-axis loading at angles at 0, 5, 15 and 25°. The square tubes had two different …
Flight Test Evaluation Of Elevator Stick Force Gradients On General Aviation Aircraft, Isaac Lee Faust
Flight Test Evaluation Of Elevator Stick Force Gradients On General Aviation Aircraft, Isaac Lee Faust
Theses and Dissertations
The objective of this research is to establish a suitable method of changing elevator stick force gradients on a Piper Warrior II. After finding a range of stick force gradients, the gradients will later be evaluated to get handling qualities ratings. A stick force gradient is the change in stick force as the airspeed deviates from trim condition. An aircraft’s yoke force gives pilots haptic feedback which improves their situational awareness without the need to assess instrument readings. A high stick force gradient will give the pilots a lot of feedback but will require more physical exertion to fly the …
Unveiling Migration Patterns Using Data And Network Science, Firas Aswad
Unveiling Migration Patterns Using Data And Network Science, Firas Aswad
Theses and Dissertations
Many real-world phenomena have recently been witnessed, motivating scientists to provide a comprehensive understanding of worldwide networks, such as the human migration phenomenon. Human migration research is multidisciplinary and has yielded work in social sciences, physics, and the new field of smart city designing and planning based on big data analytics. The importance of the research comes from the impacts on both countries, sources, and distention. Impacts occur at several levels such as economy, city planning, politics, and law enforcement, leading to changes in demographics. Thus, studies on human migration help policymakers prepare and handle crises when they occur in …
Better Safe Than Sorry? Examining The Effectiveness Of Defensive Impression Management And Supplication Techniques In Attracting Minority Applicants To Public Safety Careers, Temitayo Opeyemi Lawal
Better Safe Than Sorry? Examining The Effectiveness Of Defensive Impression Management And Supplication Techniques In Attracting Minority Applicants To Public Safety Careers, Temitayo Opeyemi Lawal
Theses and Dissertations
The recent media coverage of fatal interactions between police officers and unarmed Black citizens has led to increased calls for law enforcement agencies to diversify their departments. However, many agencies struggle to attract qualified minority candidates due to the negative history between law enforcement and minority communities. This study examined whether the use targeted defensive impression management techniques, such as apologizing for past transgressions, and supplicative recruiting messages can influence attraction and job pursuit intentions for minority applicants. This study also explored whether applicant perceptions of an organization’s sincerity and value of diversity mediates the relationship between diversity recruiting messages …
Exploration Of Simplified Vehicle Operations For Electric Vertical Takeoff And Landing Through A Garmin Autopilot On A Piper Warrior, William Stefan Dietrich
Exploration Of Simplified Vehicle Operations For Electric Vertical Takeoff And Landing Through A Garmin Autopilot On A Piper Warrior, William Stefan Dietrich
Theses and Dissertations
Urban Air Mobility is an emerging concept that would allow urban transportation of both people and cargo through the air in large metropolitan cities. Because of new propulsion methods like distributed electrical propulsion, the Urban Air Mobility is concentrating on Electric Vertical Takeoff and Landing aircraft to implement its concept. Controlling and maneuvering these aircraft are very different than piloting traditional general aviation even through Electric Vertical Take and Landing aircraft aim to be in the same size category. Because of the more complex controls needed for Electric Takeoff and Landing aircraft, Simplified Vehicle Operation schemes are being developed in …
Autonomous Feature Detection For Capture Path Planning For Rendezvous And Docking With Non-Cooperative Spacecraft, Trupti Mahendrakar
Autonomous Feature Detection For Capture Path Planning For Rendezvous And Docking With Non-Cooperative Spacecraft, Trupti Mahendrakar
Theses and Dissertations
With the increasing risk of collisions with space debris and the growing interest in on-orbit servicing, the ability to autonomously capture non-cooperative, tumbling target objects remains an unresolved challenge. This thesis provides an autonomous and artificial intelligence solution to either inspect, avoid, or perform on-orbit spacecraft servicing of an uncooperative resident space object (RSO). The solution is built on the fundamentals of Convolutional Neural Networks (CNN), which is used to classify the four most targeted features of a spacecraft essential for docking and collision avoidance during rendezvous, such as solar panels, antennas, spacecraft bodies, and thrusters. The solution was then …
Intermittency Scaling Laws In Magnetohydrodynamic Turbulence: Theory, Simulations And Observations, Juan Carlos Palacios Caicedo
Intermittency Scaling Laws In Magnetohydrodynamic Turbulence: Theory, Simulations And Observations, Juan Carlos Palacios Caicedo
Theses and Dissertations
The main objective of this dissertation is to investigate intermittency of Magnetohydrodynamic (MHD) plasmas by means of high-resolution numerical simulations and large sets of solar wind data. Understanding intermittency scaling laws is a significant step forward towards understanding the fundamental properties of plasma turbulence and how spatial structures influence dissipation, heating, transport and acceleration of charged particles, which is important in a wide range of laboratory, space and astrophysical plasmas. The current stateof- the art in the theoretical understanding of intermittency in MHD turbulence is based on phenomenological (non-exact) models, numerical simulations and solar wind observations of structure functions of …
Feasibility Analysis And Performance Study Of A Pulsed Solid Propellant Integrated Propulsion System For Small Satellites, Tahir Kanchwala
Feasibility Analysis And Performance Study Of A Pulsed Solid Propellant Integrated Propulsion System For Small Satellites, Tahir Kanchwala
Theses and Dissertations
Solid propellant has come a long way since the 13th century when gunpowder was widely used as the go-to means in rocket propulsion. Of course, back then, rockets were not intended to carry humanity out of the atmosphere. Untill the introduction of liquid propellants in the mid-20th century, solid propellants were the foundation. Still, liquid propellants aimed to add more stability and controllability to rocketry and thus were preferred over their solid counterparts. This thesis seeks to analyze a novel type of propulsive device that aims to eliminate challenges faced by both types of fuels and instead utilize the advantages …
3d Printed Bioglass Incorporated Collagen Matrices For Musculoskeletal Tissue Engineering, Nilabh Sunil Kajave
3d Printed Bioglass Incorporated Collagen Matrices For Musculoskeletal Tissue Engineering, Nilabh Sunil Kajave
Theses and Dissertations
Musculoskeletal injuries are a major cause of disability affecting millions of people around the world and resulting in a significant economic burden of over $14 billion. Surgical intervention using autografts and allografts is the current gold standard used in the clinic for the repair and regeneration of musculoskeletal injuries, but these treatment options are associated with major limitations such as donor-site morbidity, need for multiple surgeries, immune-related complications, and risk for disease transmission. Over the past three decades, the development and application of tissue engineering strategies for restoration and reconstruction of damaged or diseased musculoskeletal tissues have gained considerable momentum …
Forecasting Sep Events Based On Merged Cme Catalogs Using Machine Learning, Peter William Tarsoly
Forecasting Sep Events Based On Merged Cme Catalogs Using Machine Learning, Peter William Tarsoly
Theses and Dissertations
The lack of preparation for a Solar Energetic Particle (SEP) event may be catastrophic for astronauts and aircraft passengers alike, along with their electronic equipment. It is widely theorized that SEP events are caused by Coronal Mass Ejections (CMEs), some occurring up to a full day beforehand, accompanied by additional space weather conditions. The only significant models for SEP forecasting are statistically or machine learning-based, often developed on imprecise data. We present an enhanced catalog of CMEs, along with other space weather phenomena, and their relationship with the occurrence of SEP events. Using the enhanced CME catalog, we combine machine …
The Effects Of A Flipped Classroom Compared To A Traditional Classroom On Students’ Mathematics Achievement And Critical Thinking Skills At Benghazi University, Tarik O. Hamed Beltaib
The Effects Of A Flipped Classroom Compared To A Traditional Classroom On Students’ Mathematics Achievement And Critical Thinking Skills At Benghazi University, Tarik O. Hamed Beltaib
Theses and Dissertations
This study aimed to compare the effects of two different instructional models (flipped and traditional) on students’ mathematics achievement and critical thinking skills (CTS) at Benghazi University. This study used a quasi-experimental non-equivalent control group design involving intact classes of 80 students. The primary dependent variables were mathematics achievement and critical thinking skills, and the primary independent variable was the instructional methods. The data collection instruments consisted of several different assessments:(1) A pre-and post-test (Placement test and Final test) designed by the mathematics department (2) the California Critical Thinking Skills Test (CCTST) was administered at the beginning and end of …
Dynamic Modeling Of A Three Degree Of Freedom Reaction Sphere, Joshua Michael Byron
Dynamic Modeling Of A Three Degree Of Freedom Reaction Sphere, Joshua Michael Byron
Theses and Dissertations
This thesis presents a method to simulate the dynamics of a three degree of freedom, electromagnetically suspended Northrop Grumman Corporation Reaction Sphere (NGCRS) in MATLAB Simulink® by computing the magnetic force and torque relations offline, using COMSOL® Multiphysics. The goal of the thesis is firstly to demonstrate through Finite Element Magnetic Modeling (FEM) that magnetic field interactions between a stator levitation electromagnet (EM) and the rotor permanent magnets (PM) are limited to a single EM-PM pair and that all other PMs can be considered decoupled from the EM. Secondly, this thesis aims to demonstrate that a set of generalized magnetic …
Development And Optimization Of A Denitrification System To Promote Biological Nutrient Removal In A Subtropical Estuary, Abigail Gering
Development And Optimization Of A Denitrification System To Promote Biological Nutrient Removal In A Subtropical Estuary, Abigail Gering
Theses and Dissertations
Eutrophication impacts coastal ecosystems globally and triggers phytoplankton and algal blooms, leading to an increase in oxygen demand in the water column and sediments due to various biogeochemical processes. Naturally, biological nitrification, denitrification and anammox processes help to remove nitrogen predominately by nitrifying and denitrifying bacteria in the sediments. Eutrophic systems have increased nutrient and organic matter loading and are prone to the accumulation of ‘muddy’, fine-grained, organic-rich sediments (locally termed ‘muck’) that may not be able to support high enough populations of these bacteria, and therefore, may not adequately support nitrification/denitrification processes that would otherwise remove nitrogen. To decrease …
Sales Application Engineer Turnover Intentions: An Exploration Of Education, Age And Job Tenure Through The Met-Expectations Perspective, William Kelley
Sales Application Engineer Turnover Intentions: An Exploration Of Education, Age And Job Tenure Through The Met-Expectations Perspective, William Kelley
Theses and Dissertations
Both individually and in combination, globalization and the increasing use of information technology are creating unrelenting competitive pressures on organizations once protected by distance (Porter, 1999; Porter & Millar, 1985; Narus & Anderson, 1985; Boyle, 1996). These once-protected firms, historically operating in competitive landscapes limited to local firms, now compete with organizations located across state lines and oceans. In order to compete and survive, firms must adjust to the new competitive dynamics wrought by these changes (Teece, 2000). As knowledge has been identified as one of the most important sources of competitive advantage (Drucker, 1999) and profitability (Grant, 1991), this …
Organizational Effectiveness In Women-Owned Small Businesses Within The Defense Sector Of Northern Alabama: A Case Study Approach, Kerry Shurron Prowell
Organizational Effectiveness In Women-Owned Small Businesses Within The Defense Sector Of Northern Alabama: A Case Study Approach, Kerry Shurron Prowell
Theses and Dissertations
Research into how human capital influences organizational effectiveness in WOSBs as they pursue government contracts is lacking. Understanding the impact of human capital upon organizational effectiveness in WOSBs may also help in recognizing how knowledge and skills contribute to the firm's ability to secure a government contract. Using the case study method, the influence of human capital on organizational effectiveness in WOSBs seeking government contracts is a phenomenon this study explored. Firstly, this research has discovered the importance of knowledge within human capital as a contributor to core competencies; furthermore, this finding was meaningfully observed through the lived experiences of …
Charged Particle Environment Testing Of A Deep Space Radiation Shield With Associated Fabrication And Calibration Of Pulsed Power Systems, Mark Bedford Moffett
Charged Particle Environment Testing Of A Deep Space Radiation Shield With Associated Fabrication And Calibration Of Pulsed Power Systems, Mark Bedford Moffett
Theses and Dissertations
Space radiation is one of the primary dangers faced outside of the protective magnetosphere of Earth. Despite the persistent radiation threat to self-contained human habitation and the risk of increased exposure during long-duration missions, reliable long-term radiation protection is not well-developed. Active shielding is an avenue of preventative radiation protection that could be deployed to protect astronauts and biological life from the effects of radiation. This dissertation explores the design scalability of an active magnetic shield for protecting against isotropic radiation in deep space. Each shield is composed of two concentric, elliptical layers of circular conducting coils, each arranged like …
The Impact Of Increasing Flood Frequency On Flood Inundation: A Case Study Of The Little River In Florida, Maj Amanda Catharina Allen
The Impact Of Increasing Flood Frequency On Flood Inundation: A Case Study Of The Little River In Florida, Maj Amanda Catharina Allen
Theses and Dissertations
Floods are considered one of the most devastating natural hazards and are projected to increase in frequency and magnitude in many places around the world, one of them being Florida. Understanding the potential changes of flood hazards due to climate change is of paramount importance for developing effective flood mitigation procedures and resilient infrastructures. In this work, changes in flood inundation characteristics (flood depth and extent) in response to changes in future flood magnitudes are estimated and analyzed for the Little River basin in northwest Florida. HEC-RAS hydraulic model is set up and validated against observations for the flood event …
An Evolutionary Inspired Framework For Grasp Planning Automation On Sheet-Metal Parts With Multi-Type Grippers, Jicmat Andres Ali Tribaldos
An Evolutionary Inspired Framework For Grasp Planning Automation On Sheet-Metal Parts With Multi-Type Grippers, Jicmat Andres Ali Tribaldos
Theses and Dissertations
Industrial robot-mounted grippers are commonly used in the automotive industry to position, manipulate, and immobilize sheet-metal parts during several manufacturing and assembly operations. Nowadays, the use of grippers that use two or more different gripping principles such as magnets, suction cups, and fingers to accomplish the gripping task is common. Automation of the steps involved in the design of these multi-type grippers is essential to the timely introduction of new vehicles to the market. The main reason being that production of the vehicles cannot start before designing, testing, and building the grippers for its components, but the design of the …
A Machine Learning-Based Approach To Predict And Optimize The Performance Of Zero Energy Building (Zeb): A Case Study For Florida, Benjamin Kubwimana
A Machine Learning-Based Approach To Predict And Optimize The Performance Of Zero Energy Building (Zeb): A Case Study For Florida, Benjamin Kubwimana
Theses and Dissertations
Machine learning is currently one of the most searched fields aiming to solve real-life problems. Building simulation software tools help engineers estimate building energy behaviors before the actual construction, allowing implementation of more energy efficient choices in building design and construction. Current building energy simulation software tools are mostly physics-based and still lack the benefit obtained with machine learningbased modeling, which offers fast and less computationally expensive techniques to build energy models and efficiently perform design optimization. This thesis presents a machine learning-based approach for building energy modeling and optimizing design parameters to minimize building’s energy consumption. The study is …
Thermoelectric-Based Cooling Systems For Building Application: A Sustainable Solution, Seyedehmohadeseh Seyednezhad
Thermoelectric-Based Cooling Systems For Building Application: A Sustainable Solution, Seyedehmohadeseh Seyednezhad
Theses and Dissertations
In the United States, buildings account for a large share of the annual energy consumption, nearly 40%. Fossil fuels including coal, oil, and natural gas account for the main source of electric power generation and constitute the largest portion of the building energy consumption. Such a high level of fossil fuel consumption is a multifaceted challenge as demand for energy grows, and natural resources become scarce and expensive, while the climatic effects of massive energy use will be clearly felt by all. As a necessary component for occupants’ thermal comfort, cooling and air conditioning systems are among the largest energy …