Digital Commons Network^™

An Evaluation Of Hospital-Based Health Technology Assessment Processes In The United States., Scott Skinner

Electronic Theses and Dissertations

This research study explored the practices of hospital-based health technology assessment (HTA) in the U.S., as experienced by healthcare technology management (HTM) professionals. HTA can play an important role in helping to evaluate health technologies at both the macro (e.g., policy) level as well as at the micro (e.g., institutional) level of the public health ecosystem (C. S. Goodman, 2004). HTA seeks to broadly evaluate the effects, properties, and other impacts of various health technologies (C. S. Goodman, 2004). Common goals of HTA are to evaluate the safety, effectiveness, and cost-benefit of health technologies. A primarily phenomenological approach was used …

Novel Microdevices To Analyze Toxic Volatile Organic Compounds., Sujoy Halder

Electronic Theses and Dissertations

There has been a growing interest to measure volatile organic compounds (VOCs) in a range of environmental applications. The presence of toxic VOCs in the air has been associated with serious health problems including asthma, central nervous system dysfunction, cardiovascular disease and cancer, etc. Different analytical instruments such as gas chromatography-mass spectrometry (GC-MS) and sensor systems, such as metal oxide sensors are used to analyze VOCs. However, challenges still exist in the detection of airborne VOCs because of their trace concentration and interference with complex gas mixtures. In this dissertation, two microfabricated devices, a sensor array and a micropreconcentrator were …

Guided Data Augmentation For Improved Semi-Supervised Image Classification In Low Data Regime., Fadoua Khmaissia

Electronic Theses and Dissertations

Deep learning models have achieved state of the art performances, especially for computer vision applications. Much of the recent successes can be attributed to the existence of large, high quality, labeled datasets. However, in many real-world applications, collecting similar datasets is often cumbersome and time consuming. For instance, developing robust automatic target recognition models from infrared images still faces major challenges. This is mainly due to the difficulty of acquiring high resolution inputs, sensitivity to the thermal sensors' calibration, meteorological conditions, targets' scale and viewpoint invariance. Ideally, a good training set should contain enough variations within each class for the …

Synthesis, Property Tuning And Degradation Studies Of Phosphorene-Based Materials., Usman Onuminya Abu

Electronic Theses and Dissertations

Two-dimensional (2D) layered materials have sparked the interest of researchers because of their interesting properties drawn from quantum confinement effects, elevated density of states (DOS), increased surface area, increased active sites, etc. Phosphorene, an interesting addition to the 2D material family in 2014, has interesting properties such as in-plane anisotropy, elevated carrier mobility and thickness-dependent bandgaps that have made it a material of intense interest. Furthermore, there have been theoretical studies predicting that phosphorene could be made even more versatile by intercalating alkali atoms into its layers. Intercalation has proven to be a veritable tool for synthesis, modification, transformation, and …

Structural, Magnetic, Electrical, Pseudocapacitive, And Electrocatalytic Properties Of Bilayered Ruddlesden-Popper Oxides., Chandana Kananke-Gamage

Electronic Theses and Dissertations

Ruddlesden Popper (RP) oxides are perovskite-derived functional materials with the general formula An-1Aʹ2BnO3n+1, where A/Aʹ is often a lanthanide or alkaline earth metal, and B is usually a transition metal. These materials contain perovskite-like connectivity, where BO6 units share apexes to form layers that are stacked above each other. The number of layers in each stack is represented by n in the above formula. The spaces between stacks are often occupied by lanthanide or alkaline-earth metals (Aʹ-site metals), which also reside in intra-stack spaces (A-site) between the octahedra. Oxide materials derived from perovskites have been studied for a wide range …

Chloramine Devulcanization Of Waste Rubber., Patrick Kroeger

Electronic Theses and Dissertations

The disposal of waste rubber, particularly tire rubber, continues to pose a challenge in the 21st century. As a result, most end-of-life tires (ELTs) are either dumped in landfills or burned as tire-derived fuel. Chloramine devulcanization may offer a viable solution to this problem. Chloramine devulcanization is a low-temperature, low-pressure, process that selectively breaks sulfur crosslinks while preserving the polymer backbone. Chloramine devulcanization enables the recovery of chloramine recovered carbon black (CrCB) and devulcanized rubber (CdR) as separate products. Initial analysis of CdR revealed that it was formable and malleable, suggesting that crosslinking was absent. Spectroscopy showed that CdR contained …

Modeling, Simulation And Control Of Microrobots For The Microfactory., Zhong Yang

Electronic Theses and Dissertations

Future assembly technologies will involve higher levels of automation in order to satisfy increased microscale or nanoscale precision requirements. Traditionally, assembly using a top-down robotic approach has been well-studied and applied to the microelectronics and MEMS industries, but less so in nanotechnology. With the boom of nanotechnology since the 1990s, newly designed products with new materials, coatings, and nanoparticles are gradually entering everyone’s lives, while the industry has grown into a billion-dollar volume worldwide. Traditionally, nanotechnology products are assembled using bottom-up methods, such as self-assembly, rather than top-down robotic assembly. This is due to considerations of volume handling of large …

Transmission And The Evolution Of Diseases Caused By Chlamydia Trachomatis, Sars-Cov-2, And Plasmodium Species., Nathan Steffens

Electronic Theses and Dissertations

Principles of natural selection have proven valuable for explaining why pathogens cause the diseases that they do. In theory, the evolved level of host exploitation should reflect how dependent a pathogen is on host health for transmission. This dependency is shaped by transmission mode and transmission opportunity, which should therefore be predictors of disease manifestations. In this dissertation, I apply these principles to investigations of depression in Chlamydia trachomatis and virulence of SARS-COV-2 and Plasmodium species. This dissertation has five chapters. In chapter I, I describe the theoretical foundation of my dissertation research. I also briefly introduce each study system. …

Social Ecological Resilience, Social Capital, Anomie And The Impact Of Covid-19., Kevin Pacifico Gonzaga

Electronic Theses and Dissertations

From climate change to racial tension and income inequality, many difficulties face the United States and those who live within its borders. The extreme and increasing political polarization in the United States as well as the impact of the COVID-19 pandemic have only made these challenges more difficult to address. In this complex web of adversity, the concept of resilience is important to study. Resilience may be broadly defined as the ability to “bounce back” or return to adaptive functioning after experiencing significant adversity or challenges (Smith et al., 2008). Better understanding how resilience functions and the general state of …

Improving The Performance Of Automatic Target Recognition Using Data Augmentation., Rolando Holmes

Electronic Theses and Dissertations

Automatic Target Recognition (ATR) is a task that aims to recognize targets based on data obtained from visual sensors such as Infrared cameras. Machine learning, in particular Deep Learning, has been the dominate approach to solve this task. However, in order to achieve high performance, Deep Learning requires a large amount of data that may not be available, which poses an issue when developing robust models. In this thesis, we propose the use of data augmentation from an automatic detector as an alternative source to supplement the need for more training data. We use a two stage approach to develop …

Detection Of Toxic Aldehydes In Aerosols Of Electronic Cigarettes., Ellie Bess Reed

Electronic Theses and Dissertations

Over the past decade, use of electronic cigarettes (e-cigarettes) has increased in the younger generations of the United States. With the broad range of flavors and devices distributed on the market, American youth are prime marketing targets for the e-cigarette industry. To create a more regulated market, research of this thesis has been conducted on newer generations of e-cigarette “MOD” devices to examine how e-cigarette battery power output and coil temperature, concentrations of propylene glycol and vegetable glycerin, added flavorings (strawberry, mango, and menthol), and the presence of nicotine affect generation of aerosol particles and aldehydes in aerosols emitted by …

Impact Of Community-Based Care Model On Child Welfare Professionals: A Study Of Workload, Job Satisfaction, And Turnover Intent, Kerri Taylor

Electronic Theses and Dissertations

Much of the research on child welfare workers is in a traditional service model. However, there is a lack of empirical studies regarding childcare workers in a community-based care model. This study examines whether transitioning to the community-based model has positively impacted workers’ perspectives regarding turnover intention, job satisfaction, and workload manageability. A cross-sectional survey design was used with convenient sampling from a Texas Department of Family Protective Service Region that transitioned to the CBC model. The single source continuum contractor employed a sample of 125 potential respondents in the selected region. A total of 43 permanency workers responded to …

Moral Objections To Pornography: Does The Reason For Opposition Affect Consumption?, Grant Parker

Electronic Theses and Dissertations

Recent literature has suggested a link between self-described “problematic” pornography usage or pornography addiction and moral incongruence (Grubbs et al., 2022; Guidry et al., 2019). That is, when someone is morally opposed to pornography, they feel worse about their use of it. As of yet, however, no link has been established between specific reasons for objecting to pornography and their effects on consumption. Participants were 54 adults selected randomly using Amazon’s MTurk survey distribution platform. Respondents completed demographic questions and 6 scales measuring frequency of pornography use, objections to pornography, self-perceived problematic porn use, external and internal shame, God representations, …

Impact Of Personalized Interactive Storytelling On Suspension Of Disbelief In Clinical Simulation, Audra Renee-Smith Xenakis

Electronic Theses and Dissertations

The literature review found suspension of disbelief (SOD) in clinical simulation heavily weighted on educators alone within high-fidelity environments. The project examined a co-created narrative background story applied to a simulated patient’s clinical profile to determine achieving an improved connectedness toward the simulated patient leading to enhanced SOD and enhanced levels of learning and reaction. The studied population was third-semester associate degree nursing students over 18 years of age with prior clinical simulation experience who were not repeating the semester. The research methodology used a quantitative experimental design with cluster sampling, randomization, and post-Likert-scored questionnaires. The intervention group co-created personalized …

Impostor Phenomenon, College-Going Knowledge, And Staff Expectations: Ramifications On First Time In College Students Enrollment, Julia A. Vickery

Electronic Theses and Dissertations

A lack of technically trained, skilled, and educated workforce has become a critical issue in Texas. Furthermore, an educated workforce improves communities and individuals with economic, health, and personal benefits. Community colleges not only provide open-access admissions and low-cost tuition but are specifically aligned with educating the technical and industrial skilled workforce. Although a post-high school education has never been more accessible or necessary for obtaining high-earning jobs, post-high school college enrollment is declining, and conventional reform strategies do not appear to be effecting change. Graduating high school students aspire to attend postsecondary training by applying and being accepted but …

Longitudinal Insights Into Student Behaviors And Program Impact: A Multi-Year Analysis Of Post-Program Surveys Pre- And Post-Covid-19, Brendan Bernard Charles Harmon

Electronic Theses and Dissertations

Substance use is arguably the most pertinent concern for college students. The prolonged use of substances has consequences that may impact many aspects of one’s life. As a result of decades worth of research, multiple evidence-based interventions have been created to help aid college students. One of these interventions includes BASICS, Brief Alcohol Screening and Intervention for College Students. This study examined experiences of the BASICS program participants with special attention to the impact of COVID-19. It used a convenience sample of 44 after-program survey respondents from 2015 to 2022 at a faith-based private university in Texas. This study found …

Bloom: A 21st Century Mandolin Concerto, Ashley Hoyer

Electronic Theses and Dissertations

I have created a career performing various types of music on the mandolin. Very little of the concert repertoire, however, includes music originally written for the mandolin with most of it consisting of rearrangements of violin, cello, or piano music. This observation has led me down a path to learn why there is a lack of mandolin concert repertoire as well as to create new music specifically written for the instrument. In this thesis, an original mandolin concerto, Bloom, aims not only to add to the instrument’s repertoire, but bring it into the twenty-first century using contemporary compositional techniques. I …

Computational Fluid Dynamics Model Of Hyperthermic Intraperitoneal Chemotherapy., Olivia Cooney

Electronic Theses and Dissertations

Hyperthermic intraperitoneal chemotherapy (HIPEC) is a procedure that targets abdominal tumors in the intraperitoneal space. During the procedure, chemotherapy heated to 40-43^oC is cycled through the abdomen for 1 to 2 hours. Although a majority of studies have focused on clinical outcomes, the dynamics of the intra-abdominal flow remain poorly understood. Consequently, it has been difficult to gauge the tumor targeting efficacy, which depends critically on temperature and chemotherapy flow rates. This study establishes a computational framework to evaluate the dynamics of fluid flow during HIPEC, with the goal to enable optimization of tumor drug exposure. A computer …

Metabolomic Differentiation Of Tumor Core And Edge In Glioma., Mary E. Baxter

Electronic Theses and Dissertations

Glioma is one of the most aggressive forms of brain cancer. It has been shown that the microenvironments differ significantly between the core and edge regions of glioma tumors. This study obtained metabolomic profiles of glioma core and edge regions using paired glioma core and edge tissue samples from 27 human patients. Data was acquired by performing liquid-liquid metabolite extraction and 2DLC-MS/MS on the tissue samples. In addition, a boosted generalized linear machine learning model was employed to predict the metabolomic profiles associated with O-6-methylguanine-DNA methyltransferase (MGMT) promoter methylation.

A panel of 66 metabolites was found to be statistically significant …

Exploring The Lived Experiences Of Women Superintendents In Texas, Louisiana, And Mississippi, Lakeyshure Washington-Marzell

Electronic Theses and Dissertations

Abstract

A qualitative phenomenological study examined the challenges and barriers women superintendents encountered in their quest for and service as superintendents in Louisiana, Mississippi, and Texas. Women make up most teaching positions today, but men dominate the superintendent’s office. A correlation should exist between the number of women teachers and the number of women leaders. However, women account for less than one-quarter of superintendents in the United States, while men occupy most positions. A qualitative research design was employed to gain a deeper understanding of the problem. After gathering information from research participants, I performed an interpretative phenomenological analysis to …

Exploring The Upward Transfer Advising Experience Of First-Generation Latinx Community College Students, Lizette Avalos-Morales

Electronic Theses and Dissertations

The purpose of this qualitative study was to investigate the student experience of Latinx first-generation community college students who graduated from a community college and transferred to a 4-year university. The research examined if intrusive advising served as a mechanism to aid academic persistence despite the challenges of first-generation Latinx students. Eleven first-generation community college students who graduated from a Hispanic Serving Institution in southwest Kansas were interviewed. The thematic analysis conducted led to five themes emerging. The themes included family, meaningful relationships, belonging, independence, and embracing uncertainty. The theme of family was separated into two subthemes: family support and …

Emotional Intelligence Of Leaders In Higher Education And Its Impact On Employees, Jenny R. De Los Santos

Electronic Theses and Dissertations

The purpose of this quantitative research study was to further understand the relationship between the emotional intelligence of faculty who have moved up into administrative positions and nonfaculty leaders within university academic affairs. Higher education institutions have a history of high employee turnover. There is a lack in the hiring process within higher education, and the lack of a hiring process causes difficulties when leaders go from faculty or staff roles to administrative and supervisory roles with little training on managing their emotions and employees’ emotions, hindering leaders from thriving in their leadership positions. The sampling was leaders from traditional …

Effective Cte Program Administration: Assumed Or Developed?, Adrian L. Eaglin

Electronic Theses and Dissertations

The recognition of the potentially transformative effects of having a quality career and technical education program has grown exponentially over the past two decades in the United States. As such, it is paramount that those serving as administrators of this co-curricular content area be prepared, trained, and developed to effectively lead these important programs at the campus level. This qualitative action research is a case study, using two types of interviews of 38 specific personnel within the career and technical education departments and leadership in that district to determine whether effective career and technical education administration is assumed or developed …

On Site Healthcare, Amy Roden

Electronic Theses and Dissertations

A productive workforce and retention of employees is an essential part of a company’s reputation and elevation of the company to be the best to the workforce. Healthy and present employees are a key to this productive workforce. Transient workers in the pipeline construction are away from their families and loved ones and can struggle to stay healthy and find quality healthcare while working long hours multiple days a week. Employers on these job sites can help their employees by providing onsite healthcare. The research shows there is a lack of healthcare providers available, especially in more rural areas. The …

Reference Frames In Human Sensory, Motor, And Cognitive Processing, Dongcheng He

Electronic Theses and Dissertations

Reference-frames, or coordinate systems, are used to express properties and relationships of objects in the environment. While the use of reference-frames is well understood in physical sciences, how the brain uses reference-frames remains a fundamental question. The goal of this dissertation is to reach a better understanding of reference-frames in human perceptual, motor, and cognitive processing. In the first project, we study reference-frames in perception and develop a model to explain the transition from egocentric (based on the observer) to exocentric (based outside the observer) reference-frames to account for the perception of relative motion. In a second project, we focus …

Deep Learning For Power Flow Estimation And High Impedance Fault Detection, Kun Yang

Electronic Theses and Dissertations

My thesis is divided into two parts.

The first part is: “Optimal Power Flow Estimation Using One-Dimensional Convolutional Neural Network [1]“. Optimal power flow (OPF) is an important research topic in power system operation and control decisions. Traditional OPF problems are solved through dynamic optimization with nonlinear programming techniques. For a large power system with large amounts of variables and constraints, the solving process would take a long time. This paper presents a new method to quickly estimate the OPF results using a one-dimensional convolutional neural network (1D-CNN). The OPF problem is treated as a high-dimensional mapping between the load …

Small Gtpase Regulated Intracellular Protein Trafficking In Endothelium, Caitlin Francis

Electronic Theses and Dissertations

Intracellular protein trafficking is the movement of membrane-bound organelles to and from requisite locations within the cell. Small GTPases are a critical component to the spatiotemporal accuracy of intracellular trafficking pathways as they determine the specificity and direction of organelle transport. There exists over 150 small GTPases categorized into 5 sub-families and are employed across all cell types. Despite their universal expression and relevance to cellular function, small GTPases remain incompletely understood across tissue types. In various instances, the trafficking pathway of a particular Rab in one cell type may belong to a completely disparate pathway in another cell type. …

Unsupervised Learning Algorithm For Noise Suppression And Speech Enhancement Applications, Abdullah Zaini Alsheibi

Electronic Theses and Dissertations

Smart and intelligent devices are being integrated more and more into day-to-day life to perform a multitude of tasks. These tasks include, but are not limited to, job automation, smart utility management, etc., with the aim to improve quality of life and to make normal day-to-day chores as effortless as possible. These smart devices may or may not be connected to the internet to accomplish tasks. Additionally, human-machine interaction with such devices may be touch-screen based or based on voice commands. To understand and act upon received voice commands, these devices require to enhance and distinguish the (clean) speech signal …

A Unified Approach To Regression Testing For Mobile Apps, Zeinab Saad Abdalla

Electronic Theses and Dissertations

Mobile Applications have been widely used in recent years daily all over the world and are essential in our personal lives and at work. Because Mobile Applications update frequently, it is important that developers perform regression testing to ensure their quality. In addition, the Mobile Applications market has been growing rapidly, allowing anyone to write and publish an application without appropriate validation. A need for regression testing has arisen with the growth of different Mobile Apps and the added functionalities and complexities. In this dissertation, we adapted the FSMWeb [14] approach for selective regression testing to allow for selective regression …

Moving From Theory To Practice: Examining Teaching Mathematics For Social Justice In An Elementary School Classroom, Krystal Giles

Electronic Theses and Dissertations

Teaching mathematics for social justice is a distinctive approach to mathematics education that seeks to have students use mathematics to navigate their identities, understand their lived experiences, examine inequities, and become agents of change. Current research provides a rich explanation of what teaching mathematics for social justice entails. Still, there is a need for research that studies how to move from theory to practice. The purpose of this research study is to examine the experience of teaching mathematics for social justice within my fifth-grade mathematics classroom for myself and my students, analyze the extent to which students’ ethnic and academic …