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Sparse Signal Recovery Under Sensing And Physical Hardware Constraints, Davood Mardaninajafabadi
Sparse Signal Recovery Under Sensing And Physical Hardware Constraints, Davood Mardaninajafabadi
Electronic Theses and Dissertations
This dissertation focuses on information recovery under two general types of sensing constraints and hardware limitations that arise in practical data acquisition systems. We study the effects of these practical limitations in the context of signal recovery problems from interferometric measurements such as for optical mode analysis. The first constraint stems from the limited number of degrees of freedom of an information gathering system, which gives rise to highly constrained sensing structures. In contrast to prior work on compressive signal recovery which relies for the most part on introducing additional hardware components to emulate randomization, we establish performance guarantees for …
Investigation Of The Effect Of Edge-Oxidized Graphene Oxide (Eogo) On The Properties Of Cement Composites, Yousef Alharbi
Investigation Of The Effect Of Edge-Oxidized Graphene Oxide (Eogo) On The Properties Of Cement Composites, Yousef Alharbi
Electronic Theses and Dissertations
The use of edge-oxidized graphene oxide (EOGO), produced by a mechanochemical process that allow to deliver a product suitable for large-scale production at affordable cost, as an additive in cement composites was investigated. Comprehensive experimental tests were conducted to investigate the effect of EOGO on the properties of cement composites. The experimental tests were designed for three subtasks: (1) investigation of the performance of EOGO and its mixing method on the strength, pore structure and microstructure of EOGO-cement composites, (2) evaluation of the rheological and fluidity behavior of EOGO-cement paste and mortar, and (3) investigation of the mechanism of the …
Conceptualizing The Role Of Severity In Counterproductive Work Behavior: Predicting Employee Engagement In Minor And Severe Cwbs, Katherine Ciarlante
Conceptualizing The Role Of Severity In Counterproductive Work Behavior: Predicting Employee Engagement In Minor And Severe Cwbs, Katherine Ciarlante
Electronic Theses and Dissertations
Counterproductive work behaviors (CWBs) have been identified as pervasive employee behaviors with the potential to cause significant harm in the workplace (e.g., Sackett & DeVore, 2001). Because of the considerable threat CWBs pose to organizational and employee well-being, a literature has emerged to better understand the structure of these behaviors and identify the factors and conditions that effect employee engagement in counterproductive acts. While past research has distinguished between types of CWBs, i.e., theft, sabotage, withdrawal, less attention has been paid to the specific forms these behaviors take. For example, being two hours late to work is more serious and …
Development Of Decision Support System For Active Traffic Management Systems Considering Travel Time Reliability, Whoibin Chung
Development Of Decision Support System For Active Traffic Management Systems Considering Travel Time Reliability, Whoibin Chung
Electronic Theses and Dissertations
As traffic problems on roadways have been increasing, active traffic management systems (ATM) using proactive traffic management concept have been deployed on freeways and arterials. The ATM aims to integrate and automate various traffic control strategies such as variable speed limits, queue warning, and ramp metering through a decision support system (DSS). Over the past decade, there have been many efforts to integrate freeways and arterials for the efficient operation of roadway networks. It has been required that these systems should prove their effectiveness in terms of travel time reliability. Therefore, this study aims to develop a new concept of …
A System Dynamics Approach On Sustainability Assessment Of The United States Urban Commuter Transportation, Tolga Ercan
A System Dynamics Approach On Sustainability Assessment Of The United States Urban Commuter Transportation, Tolga Ercan
Electronic Theses and Dissertations
Transportation sector is one of the largest emission sources and is a cause for human health concern due to the high dependency on personal vehicle in the U.S. Transportation mode choice studies are currently limited to micro- and regional-level boundaries, lacking of presenting a complete picture of the issues, and the root causes associated with urban passenger transportation choices in the U.S. Hence, system dynamics modeling approach is utilized to capture complex causal relationships among the critical system parameters affecting alternative transportation mode choices in the U.S. as well as to identify possible policy areas to improve alternative transportation mode …
Shape Recovery Behavior Of Carbon Nanopaper Shape Memory Polymer Composite, Veli Bugra Ozdemir
Shape Recovery Behavior Of Carbon Nanopaper Shape Memory Polymer Composite, Veli Bugra Ozdemir
Electronic Theses and Dissertations
This thesis presents analytical, experimental and modeling studies of the shape recovery behavior of electrically activated Carbon Nanopaper (CNP) Shape Memory Polymer (SMP)composite. The composite structure studied consists of a CNP layer sandwiched by two SMP layers where the CNP layer acts as a flexible electrical heater when a voltage difference is applied. The behavior of CNP/SMP composite presents a coupled electrical - thermal - structural problem. The governing equations for the multiphysics behavior are derived. Derived parameters as a result of multiphysics analysis and effects of these parameters on the shape recovery behavior are investigated. The mechanical properties of …
Nonlinear Control Synthesis For Facilitation Of Human-Robot Interaction, Zhangchi Ding
Nonlinear Control Synthesis For Facilitation Of Human-Robot Interaction, Zhangchi Ding
Electronic Theses and Dissertations
Human-robot interaction is an area of interest that is becoming increasingly important in robotics research. Nonlinear control design techniques allow researchers to guarantee stability, performance, as well as safety, especially in cases involving physical human-robot interaction (PHRI). In this dissertation, we will propose two different nonlinear controllers and detail the design of an assistive robotic system to facilitate human-robot interaction. In Chapter 2, to facilitate physical human-robot interaction, the problem of making a safe compliant contact between a human and an assistive robot is considered. Users with disabilities have a need to utilize their assistive robots for physical interaction during …
Fundamental Characteristics Of Supercritical Co2 Combustion, Raghu Veera Manikantachari Kancherla
Fundamental Characteristics Of Supercritical Co2 Combustion, Raghu Veera Manikantachari Kancherla
Electronic Theses and Dissertations
The direct-fired supercritical CO2 (sCO2) cycle is conceptually superior to many of the trending energy production technologies due to their remarkably promising efficiency, environmental friendliness and cost. The accurate simulation of this combustion is very important because the operating conditions are very challenging to its experimentation. Hence, the current work focuses on identifying various thermal, transport, chemical kinetic models, investigating various fundamental characteristics and verifying the validity of important underlying modeling assumptions in focus to supercritical CO2 combustion. In the current work, various thermal and transport property models are identified based on accuracy, computational cost and ease of implementation for …
Scalable Map Information Dissemination For Connected And Automated Vehicle Systems, S. M. Osman Gani
Scalable Map Information Dissemination For Connected And Automated Vehicle Systems, S. M. Osman Gani
Electronic Theses and Dissertations
Situational awareness in connected and automated vehicle (CAV) systems becomes particularly challenging in the presence of non-line of sight objects and/or objects beyond the sensing range of local onboard sensors. Despite the fact that fully autonomous driving requires the use of multiple redundant sensor systems, primarily including camera, radar, and LiDAR, the non-line of sight object detection problem still persists due to the inherent limitations of those sensing techniques. To tackle this challenge, the inter-vehicle communication system is envisioned that allows vehicles to exchange self-status updates aiming to extend their effective field of view and thus compensate for the limitations …
Detecting Anomalies From Big Data System Logs, Siyang Lu
Detecting Anomalies From Big Data System Logs, Siyang Lu
Electronic Theses and Dissertations
Nowadays, big data systems (e.g., Hadoop and Spark) are being widely adopted by many domains for offering effective data solutions, such as manufacturing, healthcare, education, and media. A common problem about big data systems is called anomaly, e.g., a status deviated from normal execution, which decreases the performance of computation or kills running programs. It is becoming a necessity to detect anomalies and analyze their causes. An effective and economical approach is to analyze system logs. Big data systems produce numerous unstructured logs that contain buried valuable information. However manually detecting anomalies from system logs is a tedious and daunting …
The Creation And Validation Of A Compromising Scale For Nurses, Matthew Ng
The Creation And Validation Of A Compromising Scale For Nurses, Matthew Ng
Electronic Theses and Dissertations
For reasons such as job context and different interactions, compromising as performed by nurses is likely fundamentally different than compromising performed by other occupations. The following study proposes the creation and validation of a compromising scale for nurses. The first study aims to create the compromising scale for nurses through contemporary methods then test the reliability as well as the factor structure using an exploratory factor analysis on currently employed nurses recruited through a Qualtrics panel study. The second study then takes the final compromising scale for nurses and conducts a confirmatory factor analysis among a sample of employed nurses …
Frequency-Reconfigurable Microstrip Patch And Cavity-Backed Slot Espars, Wei Ouyang
Frequency-Reconfigurable Microstrip Patch And Cavity-Backed Slot Espars, Wei Ouyang
Electronic Theses and Dissertations
Wireless communication systems have rapidly evolved over the past decade which has led to an explosion of mobile data traffic. Since more and more wireless devices and sensors are being connected, the transition from the current 4G/LTE mobile network to 5G is expected to happen within the next decade. In order to improve signal-to-noise ratio (SNR), system capacity, and link budget, beam steerable antenna arrays are desirable due to their advantage in spatial selectivity and high directivity. Electronically steerable parasitic array radiator (ESPAR) that can achieve low-cost continuously beamsteering using varactor diodes have attracted a lot of attention. This dissertation …
A Methodology For Data-Driven Decision-Making In Last Mile Delivery Operations, Edgar Gutierrez Franco
A Methodology For Data-Driven Decision-Making In Last Mile Delivery Operations, Edgar Gutierrez Franco
Electronic Theses and Dissertations
Across all industries, from manufacturing to services, decision-makers must deal day to day with the outcomes from past and current decisions that affect their business. Last-mile delivery is the term used in supply chain management to describe the movement of goods from a hub to final destinations. This research proposes a methodology that supports decision making for the execution of last-mile delivery operations in a supply chain. This methodology offers diverse, hybrid, and complementary techniques (e.g., optimization, simulation, machine learning, and geographic information systems) to understand last-mile delivery operations through data-driven decision-making. The hybrid modeling might create better warning systems …
Saw Correlator Temperature Compensation Using A Pulse Width Modulated Temperature Controller, Daniel Betancourt
Saw Correlator Temperature Compensation Using A Pulse Width Modulated Temperature Controller, Daniel Betancourt
Electronic Theses and Dissertations
A Surface Acoustic Wave (SAW) correlator built on a Lithium Niobate substrate is temperature compensated in order to maintain a constant center frequency. Frequency shifts as a result of temperature variations limit device performance. An Arduino®-based PWM temperature controller is developed to read the device temperature from a resistance temperature detector located on the SAW wafer and to regulate its temperature to a specified setpoint by providing current to a heater which is co-located with the temperature sensor on the SAW correlator substrate. The final temperature controller achieves frequency shifts of 0.013 MHz from room temperature with a worst-case PPM …
Multi-Touch Detection And Semantic Response On Non-Parametric Rear-Projection Surfaces, Jason Hochreiter
Multi-Touch Detection And Semantic Response On Non-Parametric Rear-Projection Surfaces, Jason Hochreiter
Electronic Theses and Dissertations
The ability of human beings to physically touch our surroundings has had a profound impact on our daily lives. Young children learn to explore their world by touch; likewise, many simulation and training applications benefit from natural touch interactivity. As a result, modern interfaces supporting touch input are ubiquitous. Typically, such interfaces are implemented on integrated touch-display surfaces with simple geometry that can be mathematically parameterized, such as planar surfaces and spheres; for more complicated non-parametric surfaces, such parameterizations are not available. In this dissertation, we introduce a method for generalizable optical multi-touch detection and semantic response on uninstrumented non-parametric …
Comparative Nutrient Removal With Innovative Green Soprtion Media For Groundwater And Stormwater Co-Treatment, Dan Wen
Electronic Theses and Dissertations
As indicated by the National Academy of Engineering, the understanding of nitrogen cycle has been deemed as one of 14 grand challenges in engineering of the 21st century. Due to rapid population growth and urbanization, the stormwater runoff increased in quantity as well as its nutrient concentrations, which may trigger serious environmental issues such as eutrophication in aquatic systems and ecosystem degradation. This study focuses on stormwater and groundwater quality control via Biosorption Activated Media (BAM) which can be applied to enhance the nutrient removal potential as an emerging Best Management Practices (BMPs). BAM was tested in this study with …
Developing A Traffic Safety Diagnostics System For Unmanned Aerial Vehicles Usingdeep Learning Algorithms, Ou Zheng
Electronic Theses and Dissertations
This thesis presents an automated traffic safety diagnostics solution using deep learning techniques to process traffic videos by Unmanned Aerial Vehicle (UAV). Mask R-CNN is employed to better detect vehicles in UAV videos after video stabilization. The vehicle trajectories are generated when tracking the detected vehicle by Channel and Spatial Reliability Tracking (CSRT) algorithm. During the detection process, missing vehicles could be tracked by the process of identifying stopped vehicles and comparing Intersect of Union (IOU) between the tracking results and the detection results. In addition, rotated bounding rectangles based on the pixel-to- pixel manner masks that are generated by …
Evolutionary Model Discovery: Automating Causal Inference For Generative Models Of Human Social Behavior, Chathika Gunaratne
Evolutionary Model Discovery: Automating Causal Inference For Generative Models Of Human Social Behavior, Chathika Gunaratne
Electronic Theses and Dissertations
The desire to understand the causes of complex societal phenomena is fundamental to the social sciences. Society, at a macro-scale has many measurable characteristics in the form of statistical distributions and aggregate measures; data which is increasingly abundant with the proliferation of online social media, mobile devices, and the internet of things. However, the decision-making processes and limits of the individuals who interact to generate these statistical patterns are often difficult to unravel. Furthermore, multiple causal factors often interact to determine the outcome of a particular behavior. Quantifying the importance of these causal factors and their interactions, which make up …
Investigation Of Computer Vision Concepts And Methods For Structural Health Monitoring And Identification Applications, Chuanzhi Dong
Investigation Of Computer Vision Concepts And Methods For Structural Health Monitoring And Identification Applications, Chuanzhi Dong
Electronic Theses and Dissertations
This study presents a comprehensive investigation of methods and technologies for developing a computer vision-based framework for Structural Health Monitoring (SHM) and Structural Identification (St-Id) for civil infrastructure systems, with particular emphasis on various types of bridges. SHM is implemented on various structures over the last two decades, yet, there are some issues such as considerable cost, field implementation time and excessive labor needs for the instrumentation of sensors, cable wiring work and possible interruptions during implementation. These issues make it only viable when major investments for SHM are warranted for decision making. For other cases, there needs to be …
Field Testing And Simulation Of Vadose-Zone Recharge Wells In The Mississippi River Valley Alluvial Aquifer As An Artificial Recharge Method, Kyungwon Kwak
Electronic Theses and Dissertations
Increasing concerns regarding depletion of groundwater in the Delta region of Mississippi have led to a need to augment natural recharge. Infiltration basins are often one of the simplest means of artificially recharging aquifers. However the Delta has a layer of clay and silt at the surface so it is a better idea to use vadose-zone recharge wells that are not limited by the surficial layer of fine soils. The purpose of this study is to use full-scale field testing to assess the feasibility of using vadose-zone wells for artificial recharge of the Mississippi River Valley alluvial aquifer by using …
We Know Where You Belong At: Institutions And Marginalized Bodies In The Literature Of Charles Chesnutt, William Faulkner, And Eudora Welty, Michelle Lynn Ayers
We Know Where You Belong At: Institutions And Marginalized Bodies In The Literature Of Charles Chesnutt, William Faulkner, And Eudora Welty, Michelle Lynn Ayers
Electronic Theses and Dissertations
This thesis portfolio explores how three southern authors used fiction to push back against social norms. The literary works of Charles Chesnutt, William Faulkner, and Eudora Welty depict the ways in which marginalized bodies are socially regulated and punished. By using Michel Foucault’s theories about power and knowledge, I explore how each of these works uses surveillance to regulate social behavior and what happens to marginalized bodies that refuse to conform to the norm. In Chesnutt’s novel The Marrow of Tradition, Dr. Miller uses his “medical gaze” to diagnose problems within the black community while also elevating himself above his …
Groundwater Transfer And Injection Pilot Project: Construction Of A Three Dimensional Groundwater Flow Model, Wesley Bluvstein
Groundwater Transfer And Injection Pilot Project: Construction Of A Three Dimensional Groundwater Flow Model, Wesley Bluvstein
Electronic Theses and Dissertations
The Mississippi River Valley Alluvial Aquifer has experienced substantial groundwater declines in eastern Arkansas and northwest Mississippi due largely to irrigation for rice corn soybeans and other water intensive crops. To alleviate groundwater decline and ensure future sustainability of water resources the U.S. Department of Agriculture has in conjunction with the U.S. Geological Survey and the University of Mississippi initiated studies to determine potential avenues of remediation. Options include improved irrigation efficiency installation of surface weirs inter-basin transfers and groundwater transfer and injection. This study develops a three-dimensional groundwater flow model of a withdrawal well adjacent to a river for …
The Relationship Between School Growth In Achievement And Professional Learning Communities Among Elementary Teachers, Jennifer Jackson Pennell
The Relationship Between School Growth In Achievement And Professional Learning Communities Among Elementary Teachers, Jennifer Jackson Pennell
Electronic Theses and Dissertations
This dissertation explores the relationships between school growth, teacher collaboration, collective teacher efficacy, teacher perceptions of Professional Learning Communities (PLC,) and Free and Reduced Lunch rates (FRL) within a school district where the implementation of a PLC model was optional. Results demonstrated that FRL is by far the strongest predictor of English Language Arts or mathematics growth. Collective teacher efficacy and teacher collaboration were positively correlated. PLCs and teacher collaboration were also positively correlated. Results inform educators and policy makers about how collaboration between teachers and equity issues both impact school growth and student learning.
We Gotta Work With What We Got: School And Community Factors That Contribute To Educational Resilience Among African American Students, Denae Bradley
We Gotta Work With What We Got: School And Community Factors That Contribute To Educational Resilience Among African American Students, Denae Bradley
Electronic Theses and Dissertations
This thesis examines how Black residents in the Mississippi Delta claim and deploy agency and resiliency in a rural community context entrenched in a legacy of oppression. Black, low-income communities are implicitly labeled non-resilient when macro-level community capitals and resiliency literature are applied. However, I find that resiliency is culturally distinctive and oftentimes detected in ritual, daily processes in Black communities. This thesis rejects dominant narratives that Black communities in Mississippi are only poor, backwards, and lacking. It questions the assumption that dominant institutions have created inescapable boundaries for Black people in this region and challenges the notion that the …
Increasing Instructional Leadership: An Applied Research Study On The Effects Of Developing Principals As Instructional Leaders In The Magnolia County School District, Leigh Anne Newton
Increasing Instructional Leadership: An Applied Research Study On The Effects Of Developing Principals As Instructional Leaders In The Magnolia County School District, Leigh Anne Newton
Electronic Theses and Dissertations
This applied research study seeks to improve principal capacity as instructional leaders. The need for principals to increase their instructional leadership capacity became evident with the ever-changing requirements of state accountability and student achievement. Using four elements in this study, cohort-based professional development for principals, principal PLCs, data meetings, and consultant and district administrator campus visits, the program sought to develop and grow principal leadership. Surveys, focus groups, and interviews were used in the study. The findings reveal improvement in instructional leadership capacity in the district and can provide educators with information, including an action plan, to implement instructional leadership …
Ionic Liquid-Based Composite Thin-Films For Selective Ion Separations In Electrodialysis, Saloumeh Kolahchyan
Ionic Liquid-Based Composite Thin-Films For Selective Ion Separations In Electrodialysis, Saloumeh Kolahchyan
Electronic Theses and Dissertations
The onset of climate change and rising global population has caused greater water scarcity, a considerable problem which threatens our world. The demand for fresh water is pushing a fast development of water purification technologies. Among these technologies, membrane-based water desalination processes are playing an interesting role in both academia and industry. Electrodialysis (ED) is an electro-membrane separation process aimed at water treatment through ion removal, which is achieved through the selective control and transport of ionic species. ED is a popular water treatment method; however, it is limited by membrane scaling, lack of ion selectivity, and high energy consumption …
Computational Modeling And Simulations Of Condition Deterioration To Enhance Asphalt Highway Pavement Design And Asset Management, Zul Fahmi Bin Mohamed Jaafar
Computational Modeling And Simulations Of Condition Deterioration To Enhance Asphalt Highway Pavement Design And Asset Management, Zul Fahmi Bin Mohamed Jaafar
Electronic Theses and Dissertations
A nation’s economy and prosperity depend on an efficient and safe transportation network for public mobility and freight transportation. A country’s road network is recognized as one of the largest public infrastructure assets. About 93 percent of 2.6 million miles of paved roads and highways in the United States (U.S.) are surfaced with asphalt. Longitudinal roughness, pavement cracking, potholes, and rutting are the major reasons for rehabilitation of asphalt roads. Billions of dollars are required annually for the maintenance and rehabilitation of road networks. If timely maintenance and rehabilitation are not performed, the pavement damages inflicted by heavy traffic repetitions …
Evaluation Of Wireless Router Antennas And 3d-Printed Simulated Antenna Designs, Bibek Kattel
Evaluation Of Wireless Router Antennas And 3d-Printed Simulated Antenna Designs, Bibek Kattel
Electronic Theses and Dissertations
As the size of the electronics devices is decreasing the overall size of the antenna inside them is also decreasing. As the antenna size becomes smaller it is more difficult to manufacture them with the process of traditional manufacturing that uses the subtractive method to manufacture a structure. This is where additive manufacturing has an edge on traditional manufacturing. The use of this method to manufacture antennas has been discussed in this thesis. Five antennas from a wireless router are evaluated by modeling them in CST Microwave Studio and are modified so that they can be manufactured with 3D printing. …
Institutional Factors That Affect Transfer Student Success At A University In The Mid-South Region Of The U.S., Elizabeth Moore
Institutional Factors That Affect Transfer Student Success At A University In The Mid-South Region Of The U.S., Elizabeth Moore
Electronic Theses and Dissertations
At a four-year university in the Memphis-metropolitan region of the United States, students who transfer do so with the likelihood of spending more time and money completing a baccalaureate degree than non-transfer students. This is what research scholar Kevin Dougherty (1992) entitled the Baccalaureate Attainment Gap or the transfer gap. In this companion dissertation, using a multi-method approach, we use the quantitative data of transfer student graduation and retention rates along with qualitative data from interviews conducted with administrative staff about transfer student success. We consider these selected outcomes and administrative staff interviews to be institutional factors that help shape …
Hydrophobization Of Cellulose-Based Fibers For Packaging Applications With Alkyl Ketene Dimers (Akd) And Food-Grade Waxes Via Supercritical Impregnation With Carbon Dioxide – Experimental And Thermodynamic Modeling Approaches, Kolawole Adenekan
Electronic Theses and Dissertations
This modified material has applications in food packaging, where frequently water-repellant surfaces are required. This method is preferable to traditional coating methods because it sizes across the entire thickness of the substrate rather than just the surface and can be used for non-planar surfaces; uses significantly less material than traditional methods and will be an excellent technique for multilayered and intelligent coating.