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Articles 9841 - 9870 of 35661
Full-Text Articles in Entire DC Network
Characterization Of Acoustic Modes In Aeroengines, Michelle Otero
Characterization Of Acoustic Modes In Aeroengines, Michelle Otero
Electronic Theses and Dissertations
Acoustic instabilities remain a key design concern faced in the development of liquid rocket engines. The interaction between the acoustic modes and the occurring combustion reactions can be detrimental to the engine. The fluctuating pressure waves resulting from the flame oscillations in the system can potentially lead to engine failure. For this reason, research in acoustic instabilities and methods to minimize the influences on the engine, has maintain interest in the aerospace community. The scope of this study was to design, optimize and characterize acoustic behaviors of a scaled rocket combustion chamber simulating acoustic pressure waves. Tangential and longitudinal acoustic …
Learning Opportunities And Challenges Of Sensor-Enabled Intelligent Tutoring Systems On Mobile Platforms: Benchmarking The Reliability Of Mobile Sensors To Track Human Physiological Signals And Behaviors To Enhance Tablet-Based Intelligent Tutoring Systems, Luis Vazquez
Electronic Theses and Dissertations
Desktop-based intelligent tutoring systems have existed for many decades, but the advancement of mobile computing technologies has sparked interest in developing mobile intelligent tutoring systems (mITS). Personalized mITS are applicable to not only stand-alone and client-server systems but also cloud systems possibly leveraging big data. Device-based sensors enable even greater personalization through capture of physiological signals during periods of student study. However, personalizing mITS to individual students faces challenges. The Achilles heel of personalization is the feasibility and reliability of these sensors to accurately capture physiological signals and behavior measures. This research reviews feasibility and benchmarks reliability of basic mobile …
Econometric Modeling Analysis Of Public Transit Ridership: Application For Orlando Region, Moshiur Rahman
Econometric Modeling Analysis Of Public Transit Ridership: Application For Orlando Region, Moshiur Rahman
Electronic Theses and Dissertations
Policy makers are considering several alternatives to counter the negative externalities of personal vehicle dependence. Towards this end, public transit investments are critical in growing urban regions such as Orlando, Florida. Transit system managers and planners mostly rely on statistical models to identify the factors that affect ridership as well as quantifying the magnitude of the impact on the society. These models provide vital feedback to agencies on the benefits of public transit investments which in turn act as lessons to improve the investment process. We contribute to public transit literature by addressing several methodological challenges for transit ridership modeling. …
Olfaction, Memory, And Presence In Warfighters: Do The Scents Of War Matter?, Benson Munyan
Olfaction, Memory, And Presence In Warfighters: Do The Scents Of War Matter?, Benson Munyan
Electronic Theses and Dissertations
Background: Exposure therapy (EXP) is a first-line intervention for combat-related PTSD. EXP works by repeatedly exposing the patient to the feared stimuli, situation, or physical sensations in the absence of actual danger until the stimuli no longer evoke maladaptive responses. Over the past decade, multiple technologies have been introduced to augment the EXP process by presenting multi-sensory cues (e.g., sights, smells, sounds) to increase patients' sense of presence. Exploratory research has only broadly examined the effect of odorants on the patient's sense of presence during simulated exposure tasks. This study hypothesized that those with autobiographical memories similar to the virtual …
Mathematical Foundations Of Adaptive Quantum Processing, Daniel Bonior
Mathematical Foundations Of Adaptive Quantum Processing, Daniel Bonior
Electronic Theses and Dissertations
Quantum information has the potential to revolutionize the way we store, process, transfer and acquire information [1,14,15,21,37]. In particular, quantum information offers exciting new approaches to secure communication, computation and sensing. However, in order to realize such technologies, we must first understand the effect that environmental noise has on a quantum system. This dissertation builds upon recent studies that have explored the underlying structure of quantum information and the effects of qubit channels in quantum communication protocols. This work is divided into five main chapters, with Chapter 1 being a brief introduction to quantum information. We then begin Chapter 2 …
Comparing Self-Service Technologies And Human Interaction Services In The Hotel Industry, Soona Park
Comparing Self-Service Technologies And Human Interaction Services In The Hotel Industry, Soona Park
Electronic Theses and Dissertations
Due to the development of technology, one of the major trends in the hospitality industry is service migration from human interaction services (HISs) to self-service technologies (SSTs). Therefore, it is important to examine customers service perceptions based on two different service provisions: SSTs and HISs. This study investigated similarities and differences between SST and HIS customer service perceptions based on several service quality dimensions, their effects on customer satisfaction and service loyalty in the hotel industry. Initially, this study conceptualized the service quality dimensions with six major dimensions (i.e., reliability, responsiveness, tangibles, competence, efficiency, and enjoyment) and hypothesized to have …
An Analysis Of Terrorism And Mental Health In Mass Shootings As Perceived By The Media, Amairini Sanchez
An Analysis Of Terrorism And Mental Health In Mass Shootings As Perceived By The Media, Amairini Sanchez
Electronic Theses and Dissertations
Public mass shootings are the rarest type of mass murder in the United States. Nevertheless, the media tends to focus on mass murders that appear to be the most newsworthy. The most sensational mass murders are those that have the highest victim count, that target perfect victims, and that occur in a public location. Terrorism and mental health are two separate frames that are often used by the media when reporting a mass shooting event. This creates a lack of accurate reporting that displays a distorted image of mass shootings and affects the public's perception. This study evaluated frames used …
A Theory Of Cultural Tolerance For Preventing Ethnic Conflict: Evidence From Former Soviet States, Ajara Boulibekova
A Theory Of Cultural Tolerance For Preventing Ethnic Conflict: Evidence From Former Soviet States, Ajara Boulibekova
Electronic Theses and Dissertations
The prevention of ethnic conflict has been examined and debated upon within the Political Science community; studies involving economic standing, government structure, and historical background have been credited with reducing or preventing ethnic conflict. In the years leading up to the demise of the Soviet Union ethnic conflict was felt heavily throughout the Socialist Republics. After the fall of the U.S.S.R. scholars were certain that ethnic conflict would arise in Kazakhstan but alas it did not, while other post-Soviet states, such as Moldova and Russia, had experienced ethnic conflict. What prevents ethnic conflict from occurring in one state but not …
Domestic Stalking, Violation Of Protective Orders, And Homicide In Chicago: The Influence Of Social Disorganization And Gender Inequality, Sarah Sacra
Electronic Theses and Dissertations
Domestic violence has been considered a serious issue for many decades. This problem manifests itself physically, sexually, and emotionally and can affect anyone. However, most of the domestic violence literature focuses specifically on physical intimate partner violence. Various theoretical frameworks have been utilized to explain the occurrence of domestic violence including social disorganization theory and gender inequality. These explanations are limited, however, with the former primarily extended to physical assault and the latter focusing on violence against women. This study is important as it extends our knowledge of how these two perspectives can be applied to domestic violence through the …
A Study Of Confidence In Individuals Who Actively Work With Returning Military Personnel, Ladonna Slayter
A Study Of Confidence In Individuals Who Actively Work With Returning Military Personnel, Ladonna Slayter
Electronic Theses and Dissertations
This study sought to explore if training significantly increased community workers' perceived level of confidence and their ability to provide services to returning military personnel in two locations. To measure community workers' perceived level of confidence, participants N = 143 (n = 63 Norfolk, VA) and (n= 80 Fayetteville, NC) responded to an instrument containing 40 items. Inferential and descriptive statistics were used to analyze the study variables. Analyses of variance (ANOVA) were used to compare the reliability of means between the groups from 2011 to 2012 (i.e., pre-intervention to post-intervention). A Bonferroni Correction was applied to control the familywise …
Managing Io Resource For Co-Running Data Intensive Applications In Virtual Clusters, Dan Huang
Managing Io Resource For Co-Running Data Intensive Applications In Virtual Clusters, Dan Huang
Electronic Theses and Dissertations
Today Big Data computer platforms employ resource management systems such as Yarn, Torque, Mesos, and Google Borg to enable sharing the physical computing among many users or applications. Given virtualization and resource management systems, users are able to launch their applications on the same node with low mutual interference and management overhead on CPU and memory. However, there are still challenges to be addressed before these systems can be fully adopted to manage the IO resources in Big Data File Systems (BDFS) and shared network facilities. In this study, we mainly study on three IO management problems systematically, in terms …
A Joint Econometric Approach For Modeling Crash Counts By Collision Type, Tanmoy Bhowmik
A Joint Econometric Approach For Modeling Crash Counts By Collision Type, Tanmoy Bhowmik
Electronic Theses and Dissertations
In recent years, there is growing recognition that common unobserved factors that influence crash frequency by one attribute level are also likely to influence crash frequency by other attribute levels. The most common approach employed to address the potential unobserved heterogeneity in safety literature is the development of multivariate crash frequency models. The current study proposes an alternative joint econometric framework to accommodate for the presence of unobserved heterogeneity – referred to as joint negative binomial-multinomial logit fractional split (NB-MNLFS) model. Furthermore, the study undertakes a first of its kind comparison exercise between the most commonly used multivariate model (multivariate …
Evaluating The Integration Of Chlorine Dioxide Into A Coagulation, Sedimentation, And Filtration Process Treating Surface Water, Martin Coleman
Evaluating The Integration Of Chlorine Dioxide Into A Coagulation, Sedimentation, And Filtration Process Treating Surface Water, Martin Coleman
Electronic Theses and Dissertations
Methods of optimizing the coagulation, flocculation, sedimentation, and filtration (CSF) process at a conventional surface water treatment plant (WTP) were conducted to investigate opportunities for the reduction of disinfection by-product (DBP) precursor material. The research had two primary components: (1) optimize coagulant dosage and associated operating pH and (2) investigate pretreatment oxidation with chlorine dioxide (ClO2) and potassium permanganate (KMnO4). To accomplish the first component, jar tests were conducted at various pH and aluminum sulfate (alum) dosages to model current and potential treatment conditions during the CSF process at a WTP. Isopleths were developed to examine the removal efficiencies of …
Harmful Algal Bloom Mitigating Using Recycled Concrete Aggregate Coated With Fixed-Quat., Ikenna Ezeodurukwe
Harmful Algal Bloom Mitigating Using Recycled Concrete Aggregate Coated With Fixed-Quat., Ikenna Ezeodurukwe
Electronic Theses and Dissertations
Human activities generate surplus nutrients which may lead to algal bloom events in water resources along with serious ecological problems and thus substantial economic losses. Particularly, harmful algal blooms (HABs) represent toxic cyanobacterial blooms which produce cyanotoxins. The primary concerns of HABs are the exposures to a wide variety of cyanotoxins via ingestion of contaminated drinking water, inhalation during recreational activities, and consumption of contaminated fish and shellfish. However, conventional physical and chemical methods are not always possible to efficiently handle these HABs events. It is urgent to develop viable and rapid solutions to control HABs in field and mitigate …
Assessing The Suitability Of The Division Exercise Training And Review System (Dxtrs) To Support Sustainment Training, Jacob Naylor
Assessing The Suitability Of The Division Exercise Training And Review System (Dxtrs) To Support Sustainment Training, Jacob Naylor
Electronic Theses and Dissertations
The military has used simulations to train Soldiers for several decades. Army Commanders use live, virtual and constructive training to prepare troops for combat and to improve their Military Occupational Specialty (MOS) skillset. During training and other military operations, the Army Battle Command Systems (ABCS) provide Army commanders with a Common Operational Picture (COP) which typically includes a real-time status of personnel, supplies, munitions, and equipment. In 2016, the Combined Arms Support Command (CASCOM) divested the Battle Command Sustainment Support System (BCS3) due to data latency issues. The sustainment Warfighting Function (WfF) used BCS3 as a dual-purpose system for real …
Understanding How, Where And How Much Freight Flows Using 2012 Commodity Flow Survey Data, Nowreen Keya
Understanding How, Where And How Much Freight Flows Using 2012 Commodity Flow Survey Data, Nowreen Keya
Electronic Theses and Dissertations
In recent years, with increased economic globalization, growing e-commerce and internet based shopping, freight movement patterns are undergoing a transformative change. The shipment size distribution is moving towards a higher share of smaller size shipments affecting transportation mode and vehicle type requirements. In addition, freight transportation mode is closely affected by the destination location (and its attributes). In our dissertation, we contribute to freight research by developing a comprehensive framework to examine the how, where and how much freight flows in US. Specifically, we study the following dimensions of freight flow: (1) transportation mode, (2) mode and shipment weight choice …
Development Of An Mrm Federation System Using Cots Simulations, Jaeho Kim
Development Of An Mrm Federation System Using Cots Simulations, Jaeho Kim
Electronic Theses and Dissertations
The goal of this research is to build an experimental environment for the Simulation Interoperability Laboratory (SIL) of the University of Central Florida (UCF). The Simulation Interoperability Laboratory (SIL) is researching about multi-resolution modeling(MRM), with a focus on military field uses. This thesis proposes steps to develop an MRM federation system and build two different MRM systems using COTS simulations (SIMBox, VR-Forces, and MASA Sword). This report is written to provide the basis for a time-based MRM federation study in the Simulation Interoperability Laboratory. The report describes many definitions and notions related to Multi-Resolution Modeling(MRM) and discusses examples to make …
Human Action Detection, Tracking And Segmentation In Videos, Yicong Tian
Human Action Detection, Tracking And Segmentation In Videos, Yicong Tian
Electronic Theses and Dissertations
This dissertation addresses the problem of human action detection, human tracking and segmentation in videos. They are fundamental tasks in computer vision and are extremely challenging to solve in realistic videos. We first propose a novel approach for action detection by exploring the generalization of deformable part models from 2D images to 3D spatiotemporal volumes. By focusing on the most distinctive parts of each action, our models adapt to intra-class variation and show robustness to clutter. This approach deals with detecting action performed by a single person. When there are multiple humans in the scene, humans need to be segmented …
Experimental Investigation Of Advanced Ignition Systems For High Efficiency Combustion, Bader Almansour
Experimental Investigation Of Advanced Ignition Systems For High Efficiency Combustion, Bader Almansour
Electronic Theses and Dissertations
Consumption of fossil and bio-derived fuels is growing due to energy demands associated with increase in population and standard of living across the globe. Power generation and transportation sectors are the primary two sources of fuel consumption, which have raised the demand for crude oil and led to serious environmental pollution issues. This demand for energy forced various government agencies to strengthen the allowable exhaust pollutant concentration limits. Recently, CO, CO2, particulate matter, and nitrogen oxides (NOx) emission restrictions have become more stringent to the extent that engines must operate at higher energy densities and efficiencies. Towards this goal, this …
Treatment Of Leachate Organic Matter Through Sunlight Driven Processes, Duncan Lozinski
Treatment Of Leachate Organic Matter Through Sunlight Driven Processes, Duncan Lozinski
Electronic Theses and Dissertations
The ability to manage leachate during post-closure care (PCC) of a landfill may be increasingly difficult as leachate organic matter (LOM) becomes recalcitrant when a landfill ages, requiring advanced and costly treatment technologies. This research investigated the ability to treat LOM through sunlight driven processes, with a focus on photolysis, to provide insight to landfill owners and operators on the potential of wetlands treatment as a means for reducing long-term risks and costs associated with leachate treatment during PCC. The study was completed in eight batch tests, where leachate was exposed to natural sunlight in central Florida for a period …
Trust-Based Rating Prediction And Malicious Profile Detection In Online Social Recommender Systems, Anahita Davoudi
Trust-Based Rating Prediction And Malicious Profile Detection In Online Social Recommender Systems, Anahita Davoudi
Electronic Theses and Dissertations
Online social networks and recommender systems have become an effective channel for influencing millions of users by facilitating exchange and spread of information. This dissertation addresses multiple challenges that are faced by online social recommender systems such as: i) finding the extent of information spread; ii) predicting the rating of a product; and iii) detecting malicious profiles. Most of the research in this area do not capture the social interactions and rely on empirical or statistical approaches without considering the temporal aspects. We capture the temporal spread of information using a probabilistic model and use non-linear differential equations to model …
Performance Predication Model For Advance Traffic Control System (Atcs) Using Field Data, Masood Mirza
Performance Predication Model For Advance Traffic Control System (Atcs) Using Field Data, Masood Mirza
Electronic Theses and Dissertations
Reductions in capital expenditure revenues have created greater demands from users for quality service from existing facilities at lower costs forcing agencies to evaluate the performance of projects in more comprehensive and "greener" ways. The use of Adaptive Traffic Controls Systems (ATCS) is a step in the right direction by enabling practitioners and engineers to develop and implement traffic optimization strategies to achieve greater capacity out of the existing systems by optimizing traffic signal based on real time traffic demands and flow pattern. However, the industry is lagging in developing modeling tools for the ATCS which can predict the changes …
Theoretical Paschen's Law Model For Aerospace Vehicles: Validation Experiment, Jaysen Mulligan Aroche
Theoretical Paschen's Law Model For Aerospace Vehicles: Validation Experiment, Jaysen Mulligan Aroche
Electronic Theses and Dissertations
Aerospace vehicles often experience triboelectric charging while traversing the atmosphere. Triboelectric charging occurs when a material come into frictional contact with a different material. Aerospace vehicles triboelectrically charge due to frictional contact with dust and ice crystals suspended in the atmosphere. Launch vehicles traversing ice clouds in low-pressure atmosphere are especially prone to electrostatic discharge events (i.e. sparks). These conditions are hazardous and affect the vehicle's launch commit criteria. In 2010, engineers from an ARES-I rocket launch reported concerns with triboelectric charging over their self-destruct system antenna. This concern was addressed by putting the antenna through harsh conditions in a …
Investigation Of Factors Contributing To Fog-Related Single Vehicle Crashes, Jiazheng Zhu
Investigation Of Factors Contributing To Fog-Related Single Vehicle Crashes, Jiazheng Zhu
Electronic Theses and Dissertations
Fog-related crashes continue to be one of the most serious traffic safety problems in Florida. Based on the historical crash data, we found that single-vehicle crashes have the highest severity among all types of crashes under fog conditions. This study first analyzed the contributing factors of the fog-related single-vehicle crashes' (i.e., off road/rollover/other) severity in Florida from 2011 to 2014 using association rules mining. The results show that lane departure distracted driving, wet road surface, and dark without road light are the main contributing factors to severe fog-related single vehicle crashes. Some suggested countermeasures were also provided to reduce the …
Hierarchical Corridor Safety Analysis Using Multiple Approaches, Saif Alarifi
Hierarchical Corridor Safety Analysis Using Multiple Approaches, Saif Alarifi
Electronic Theses and Dissertations
Traffic crashes are a major cause of concern globally. Extensive efforts from transportation professionals have been made to investigate new methods to identify the contributing factors to crashes at various locations on the road network. Corridors, among other road network's components, play a vital role in moving people and goods between primary zones in different areas, and the safety and operational improvements of them have been the focus of many studies since they carry the most traffic on the road network. Corridors contain mainly intersections and segments, and previous corridor studies have focused on a sole type of road entity. …
Investigating And Facilitating The Transferability Of Safety Performance Functions, Ahmed Tarek Ahmed Farid
Investigating And Facilitating The Transferability Of Safety Performance Functions, Ahmed Tarek Ahmed Farid
Electronic Theses and Dissertations
Safety performance functions (SPFs) are essential analytical tools in the road safety field. The SPFs are statistical regression models used to predict crash counts by roadway facility type, crash type and severity. The national Highway Safety Manual (HSM) is a generic guidebook used for road safety evaluation and enhancement. In it, default SPFs, developed using negative binomial (NB) regression, are provided for multiple facility types and crash categories. Roadway agencies, whether public or private, may opt to not invest their resources in data collection and processing to develop own localized SPFs. Instead, the agencies may adopt the HSM's. However, the …
A Modeling Framework Of Brittle And Ductile Fractures Coexistence In Composites, Yangyang Qiao
A Modeling Framework Of Brittle And Ductile Fractures Coexistence In Composites, Yangyang Qiao
Electronic Theses and Dissertations
In order to reduce the weight of automobiles and aircrafts, lightweight materials, such as aluminum alloy, advanced high strength steel, composite materials, are widely used to replace the traditional materials like mild steel. Composite materials are complicated in material mechanical properties and less investigated compared to metallic materials. Engineering composites can be categorized into polymer matrix composites (PMCs), metal matrix composites (MMCs) and ceramic matrix composites (CMCs) according to their matrix materials. A set of mechanical experiments ranging from micro scale (single fiber composite and thin film composite) to macro scale (PMCs and MMCs) were conducted to fully understand the …
Security Of Autonomous Systems Under Physical Attacks: With Application To Self-Driving Cars, Raj Gautam Dutta
Security Of Autonomous Systems Under Physical Attacks: With Application To Self-Driving Cars, Raj Gautam Dutta
Electronic Theses and Dissertations
The drive to achieve trustworthy autonomous cyber-physical systems (CPS), which can attain goals independently in the presence of significant uncertainties and for long periods of time without any human intervention, has always been enticing. Significant progress has been made in the avenues of both software and hardware for fulfilling these objectives. However, technological challenges still exist and particularly in terms of decision making under uncertainty. In an autonomous system, uncertainties can arise from the operating environment, adversarial attacks, and from within the system. As a result of these concerns, human-beings lack trust in these systems and hesitate to use them …
A Decision Support Model For Autonomous Trucks Strategies, Ahmad Mohamed
A Decision Support Model For Autonomous Trucks Strategies, Ahmad Mohamed
Electronic Theses and Dissertations
We examined the potential to improve the movement of freight using Truck Platooning Lane strategies on limited access highways in the State of Florida. In the First part of this research, we investigated the potential benefits from dedicating one lane from existing lanes for autonomous trucks only. In this regard, a general framework tool was developed to evaluate and compare different measurements (e.g., travel tim and emissions) to better assist decision makers to determine the most effective freight transportation strategy. Additionally, the travel time, level of service and emissions on Florida Strategic Intermodal System (SIS) were systematically analyzed using a …
Excellent Surface Passivation For High Efficiency C_Si Solar Cells, Sara Bakhshi
Excellent Surface Passivation For High Efficiency C_Si Solar Cells, Sara Bakhshi
Electronic Theses and Dissertations
Semiconductor surface clean is sometimes perceived as costly but long recognized as pivotal in determining the final semiconductor device performance and yield. In this contribution, we investigated the effectiveness of crystalline silicon surface cleaning by a simple UV-ozone process in comparison to the industry standard RCA clean for silicon photovoltaic applications. We present a unique method of processing the silicon surface effectively by UV-ozone cleaning. Despite being simple, UV-ozone cleaning results in a superior surface passivation quality that is comparable to high-quality RCA clean. When used as a stack dielectric—UV-ozone oxide overlaid by aluminum oxide—the thickness of UV-ozone oxide plays …