Digital Commons Network^™

Machine Learning-Based Design Of Doppler Tolerant Radar, Kyle Peter Wensell

Dissertations

In this work, machine learning theory is applied to the design of a radar detector in order to train a machine learning-based detector that is robust against Doppler shifts. The radar system is designed to work with data that would be otherwise intractable to conventional optimal detector design, such as transmitted noise waveforms and the effects of one-bit quantization at the receiver. The detection performance of the one-bit receiver is shown to match the performance of the derived square-law sign correlator detector. The resulting learning-based detector also introduces Doppler tolerance to the system, which allows for the successful detection of …

Decentralized Control Of Renewable Generation Systems, Milad Shojaee

Dissertations

As the global community struggles with the escalating challenges of climate change and environmental degradation, the transition to renewable energy sources has emerged as a paramount solution. Harnessing energy from renewable sources such as solar, wind, and hydro power not only alleviates the adverse effects of conventional fossil fuel energy sources, but also establishes a foundation for a sustainable and resilient future. Microgrids have been utilized as a feasible platform to integrate renewable energy sources into the electrical power generation networks. They include one or more generation units connected to nearby users, and are able to operate in both grid-connected …

Information Theoretic Bounds For Capacity And Bayesian Risk, Ian Zieder

Dissertations

In this dissertation, the problem of finding lower error bounds on the minimum mean-squared error (MMSE) and the maximum capacity achieving distribution for a specific channel is addressed. Presented are two parts, a new lower bound on the MMSE and upper and lower bounds on the capacity achieving distribution for a Binomial noise channel. The new lower bound on the MMSE is achieved via use of the Poincare inequality. It is compared to the performance of the well known Ziv-Zakai error bound. The second part considers a binomial noise channel and is concerned with the properties of the capacity-achieving distribution. …

Sensing With Integrity: Responsible Sensor Systems In An Era Of Ai, David Eisenberg

Dissertations

Deep and machine learning now offer immense benefits for consumer choice, decision-making, medicine, mental health and education, smart cities, and intelligent transportation and driver safety. However, as communication and Internet technology further advances, these benefits have the potential to be outweighed by compromises to privacy, personal freedom, consumer trust, and discrimination. While ethical consequences for personal freedom and equity rise from these technological advances, the issue may not be the technology itself but a lack of regulation and policy that allow abuses to occur. A first study examines how emerging sensor-based technologies, limited to only accelerometer and gyroscope data from …

A Molecular Dynamics Study On The Destruction Mechanism Of Per And Polyfluoroalkyl Substances Due To Ultrasound Technology, Bruno Bezerra De Souza

Dissertations

Per- and polyfluoroalkyl substances (PFAS) are a group of stable synthetic chemicals that are highly persistent and harmful pollutants to the environment and human health. PFAS have caused a strong public and regulatory response due to their ubiquitous presence in the environment and toxicity to humans. The application of ultrasound is one of the most effective treatment technologies for the mineralization of PFAS in contaminated water. However, this technology is treated as a black box causing the inability to be optimized. Therefore, there is a pressing need to investigate the intricate dynamics of PFAS degradation under ultrasound to unlock its …

Molecular-To-Continuum Scale Modeling Of Aerosols: Atmospheric Application And Beyond, Ella Ivanova

Dissertations

Aerosol modeling is critical for various applications, such as climate forecasting, air quality, and human health impact assessment. During their lifetime, aerosols undergo a complex evolution, usually divided into several stages — formation, processing, transport, and removal — that occur on different scales. Thus, the choice of modeling methods depends on the stage considered. For example, certain stages of particle formation may require nano-scale modeling while aerosol-cloud interactions span from microscale to mesoscale. This study examines the modeling of aerosol behavior over a wide range of scales, from nano to microscale, with implications to mesoscale.

This dissertation focuses on two …

Microplastic Abundance And Removal In Stormwater Using Green Infrastructure, Meghana Parameswarappa Jayalakshmamma

Dissertations

Microplastics (MPs) are increasingly recognized as a pervasive environmental contaminant, conveying other contaminants, accumulating in aquatic organisms, and posing ecological risks. The existing research has primarily focused on MPs in wastewater treatment plant effluents in surface waters. However, the role of stormwater systems in MP transport has been less explored. Given the rise in MPs from urban sources, stormwater runoff from urban areas may serve as a critical conduit for transporting land-based MPs into aquatic environments. Green infrastructures (GIs) have been recognized for mitigating flooding and improving water quality from minor storms by trapping stormwater pollutants. Yet, the capability of …

A Machine Learning-Assisted Steering And Scheduling Framework For Big-Data Scientific Workflows On Heterogeneous Computing Platforms, Yijie Zhang

Dissertations

In next-generation scientific applications, the exponential growth of big data necessitates advanced techniques for efficient data storage, processing, and analysis. This has led to the construction of intricate computing workflows, managed and orchestrated by powerful engines in big data systems as exemplified by Hadoop. As scientific applications increasingly shift towards simulation-centric approaches, traditional methodologies face new challenges in accommodating the complexity of extreme-scale numerical modeling with numerous tunable parameters. To address these challenges, this dissertation propose to develop a machine learning-assisted framework that enables autonomous computational steering of scientific simulations and optimized execution of big-data workflows on heterogeneous platforms. This …

Reproducible Fluid Structure Interaction For Complex Flows In Engineered Systems, Allen Prasad Varghese

Dissertations

This dissertation focuses on the application of numerical models to study Fluid Structure Interaction (FSI) in the industrial context. The emphasis is on a series of case studies belonging to practical applications in design and manufacturing and that are solved by a synergistic use of theoretical and computational models. The first study looks into the hydrodynamic actions experienced by vibrating slender structures immersed in viscous fluids near the free surface. This study case is relevant to applications such as, for example, marine propulsion, micro-electro-mechanical systems, and atomic force microscopy. The hydrodynamic problem is governed by three parameters, namely the frequency, …

Development Of Super Hydrophobic Membranes And Their Applications, Sumona Paul

Dissertations

Effective liquid phase separation is vital across industries, especially in aviation, chemicals, fuels, and textiles. Membrane technology offers advantages over traditional methods like distillation, with low energy consumption and protection for heat-sensitive molecules. Membrane performance is assessed based on factors such as materials, surface modification, and interactions. This research targets superhydrophobic membranes for liquid-liquid filtration and antiwetting omniphobic membranes for membrane distillation, focusing on properties like contact angle and thermal resistance.

This study presents a highly hydrophobic membrane achieved by immobilizing carbon nanotubes (CNTs) onto a PTFE microfiltration membrane. It's designed for dewatering organic-water mixtures with trace water content via …

Building Agency Through Sensemaking: The Transformational Journey And Identity Development Process Of Working Mother Leaders During The Covid-19 Pandemic, Lynn Levis

Dissertations

Working mothers in America have long juggled a multitude of responsibilities while navigating several systemic barriers in the very society that claims to support them. The COVID-19 pandemic had an outsized impact on mothers when children were sent home from daycares and schools to reduce the spread of the virus. This study sought to address an important gap in the literature by using a mixed methods constructivist grounded theory approach to examine how working mothers in leadership positions navigated their various roles and systems during the COVID-19 pandemic. Data collection consisted of a survey with 105 respondents, followed by individual, …

Evaluating The Health Literacy Practices Of A Primary Care Health System Serving A Diabetic Population At High Risk For Low Health Literacy, Alana D. Norris-Bermudez

Dissertations

Health literacy (HL) is a powerful determinant of patient health outcomes, yet a minority of the U.S. population possesses proficient health literacy. Healthy People 2030 positions HL prominently among the new overarching goals as follows, "Eliminate health disparities, achieve health equity, and attain health literacy to improve the health and well-being of all" (The Office of Disease Prevention and Health Promotion, 2023). HL comprises two interlinked components: personal HL and organizational HL, (Office of Disease Prevention and Health Promotion, n.d.). Implementing HL practices within healthcare system facilities such as hospitals, FQHCs, and/or primary care practices to support universal HL precautions …

Influence Of Social Media On Mothers' Decision-Making Regarding Vaccinations, Wendy M. Patterson

Dissertations

This study involved determining why mothers hesitate to vaccinate their children and where they get their information about vaccinations. This descriptive qualitative study guided by the health belief model explored the influence social media has on mothers' perceived barriers to vaccinating their children. A descriptive qualitative approach was used, and one-on-one audio interviews were conducted via Zoom or in person with 19 participants. Participants were mothers 19 or older, had children between zero and 18, made medical decisions for their children who resided in their household, and sought information about vaccinations via healthcare providers, social media platforms, friends, or family. …

Reducing Maternal Morbidity From Peripartum Hemorrhage In Cesarean Delivery, Jennie Lee

Dissertations

Background/Purpose: Maternal hemorrhage is the second highest cause of direct maternal death and the leading cause of morbidity and mortality in the United States. This public health crisis is highlighted by the economic burden of over $30.8 million annually in the United States. The greatest tragedy in the review of maternal mortality is that 84% of pregnancy-related deaths were determined preventable. Identifying trends of factors that predispose women to hemorrhage can mitigate rates of severe maternal morbidity and mortality. This study describes relationships among demographic factors (maternal age, race, and ethnicity), clinical and physiologic factors, which include coexisting medical conditions …

Intercultural Perspectives On Managing Organizational Change In Response To Government Policy Reform: A Case Study On The Leadership Of New Oriental Education, Yihe Yang

Dissertations

In 2021, a policy aimed at addressing educational inequality triggered a significant upheaval in the private tutoring sector of China by fundamentally transforming prevailing business models and financial viability within the industry. New Oriental Education & Technology Group Inc. (New Oriental Education), one of the preeminent private tutoring enterprises in China, attracted considerable attention for its subsequent organizational change. This study explored the leadership dynamics and organizational change efforts implemented by New Oriental after the policy enactment.

The theoretical framework synthesized organizational change theory, organizational culture, and transformative leadership approaches from both Western and Chinese perspectives. It elucidated effective practices …

Convergence And Divergence: Comparative Analysis Of Procedural Rule Changes Of The Hong Kong And Singapore International Arbitration Centers Within The Framework Of Neo-Institutional Theory, Phillip Hoang Tran

Dissertations

International commercial arbitration (ICA) plays an essential role in resolving disputes between companies engaged in complex, cross-border business transactions. It offers an efficient, neutral, and enforceable mechanism for resolving disputes across different legal and cultural backgrounds. ICA is generally conducted at international arbitration centers located throughout the world. According to the extant literature, there is convergence of procedural rules among these centers. Sabharwal and Zaman (2014), for example, claim increasing convergence of procedural rules among all the major arbitration centers. Similarly, Sharma (2021) proposes that this convergence helps build the international arbitration system. However, there is a near absence of …

Vital Voices From The Digital Divide: Testimonies Of African American Women Leadership Across Tech, Vinsche' Gray

Dissertations

Many organizations seek to highlight diversity, equity, and inclusion efforts, but African American women are still significantly underrepresented in leadership roles within the workplace (McKinsey, 2023). Within the technology (i.e., tech) space, there is concern regarding the inclusivity of African American women in leadership positions. A hostile and unsupportive environment raises concern for the future of African American women being able to attain key leadership roles. (McGee, 2018).

This study explored multifaceted experiences of eight African American women leaders in for-profit tech organizations. Black feminist thought and organizational culture and belonging were conceptual frameworks that shed light on the persistent …

Movin’ On Up: The Lived Experience Of Women Of Color In Leadership And The Supports That Helped Them Make It To The Top, Rozina Kapadia

Dissertations

Purpose: The number of women of color in leadership continues to be significantly lower than the number of men. The lack of opportunity combined with the lack of support results in less women of color in leadership. The purpose of this phenomenological study was to explore the lived experiences of women of color in their roles as leaders in corporate environments with respect to the support (personal supports, organizational supports, cultural supports, and stereotypical supports) received. Specifically, the research examined the stories of female leaders of color to understand how their experiences have supported or hindered their growth in leadership. …

A Phenomenological Study On The Perceived Impact Of Bass's Four I'S Of Transformational Leadership, Yarissa Marn

Dissertations

Purpose: The purpose of this phenomenological study was to identify and describe World of Warcraft game leaders’ perceptions of the impact on their guilds regarding Bass’s 4 I’s of transformational leadership.

Methodology: This qualitative study interviewed 13 World of Warcraft game leaders who have led their guild members for at least one year. The main source of data collection was semi-structured open-ended interview questions with other resources to include artifacts. The researcher coded and analyzed data for themes and patterns.

Findings: Several domains of Bass’s Four I’s Transformational Leadership framework were found to have an impact on World of Warcraft …

One Tiger, Many Lions: Uneven Adoption Of China's Political And Economic Investment Among Democracies In Sub-Saharan Africa, Tommy Callan

Dissertations

This dissertation examines how unique qualities of democracies in Sub-Saharan Africa and their foreign policy decision making processes affect their ability to exercise state agency. Specifically, democratic qualities affect a state’s receipt of investment from China and how well those investment projects fare once accepted. It is hypothesized that a strong executive branch leads to decreased or inconsistent Chinese investment while a strong legislature may have the opposite effect. A strong executive may also lead to an increased chance of project success while a strong legislature may have the opposite effect. High levels of party contestation may lead to decreased …

Phenomenological Research Examining Administrators And Special Education Teachers' Perception, Experience & Knowledge Of The Mississippi Special Education Growth Rubric, Tricia Pittman

Dissertations

In the current era of accountability, public school administrators’ responsibilities may include evaluating special education teachers and providing them with feedback and support to improve their effectiveness. The problem that exists is that administrators who do not have a background in special education are charged with the responsibility of evaluating special education teachers, resulting in special education teachers not getting the support or feedback necessary to improve their instructional practice.

In addition to administrators not having the background knowledge necessary to effectively evaluate and support special education teachers, the problem of developing an effective evaluation model to evaluate special education …

Business Students’ Perceptions Of The Influence Of Career, Technical, And Agricultural Education (Ctae) On Career Readiness And Graduation Outcomes, Spencer T. Fortson Jr

Dissertations

This qualitative study sought to identify and analyze the perceptions of business students on the influence of CTAE programs on career readiness and graduation outcomes. The study adopted a phenomenological approach to explore how and why students develop their perceptions of CTAE. Notably, the study explored how business students perceive the programs and their roles in promoting career readiness and graduation outcomes and provide recommendations to improve student engagement and interest in CTAE programs. The study was conducted in a large high school in Georgia among a diverse population – regarding gender, race, and socioeconomic status – of students. Notably, …

Inclusivity Within The Digital Age, Jarvis Denmark

Dissertations

This qualitative study takes a phenomenograpichal interest in the experiences of students in a school district that responded to the Covid-19 pandemic by using digital tools for instruction and to support a culturally relevant learning experience. Previous research focuses on teacher beliefs and the benefits of multiliteracies as they intersect with Culturally Relevant Pedagogy, but few studies have analyzed the experiences of students who are the prime beneficiaries of culturally relevant instructional practices. The thick description in this study was aimed at optimizing student voice, especially the voices of students of color. Also, the aim of the research was to …

Implications Of Varying Levels Of Social Support And Peer Involvement On The Success Of Baccalaureate Level Nursing Students, Jeana R. Wilcox

Dissertations

Nursing programs must be able to recruit and successfully train future nurses in a timely manner. However, some students, appearing adequately prepared in application materials, do not move successfully through baccalaureate nursing education, pass the licensing exam, and enter the nursing profession. Nursing students enter into a strictly prescribed curriculum leaving little time for traditional college environment socialization. Unveiling factors leading to greater persistence to degree attainment will ultimately lead to more nursing graduates needed to counter the current nursing shortage. One Midwestern program recently (2003-2004) lost 28% of incoming junior-level nursing students in the first two semesters (C. Horton, …

From Counterspaces To Community:A Qualitative Case Study Analysis Of Black Community Making At A Pwi, Charles Watkins

Dissertations

This qualitative case study examined how Black college students build and maintain a sense of community at a predominantly white institution (PWI). Informed by relational sociological methodology and the conceptual framework of Black placemaking, this study foregrounded the nuanced process of community building, focusing on the interplay between Black students and the spaces—physical and digital—they cocreate collectively. This study particularly emphasized the significance of the Black Student Union (BSU) as a foundational Black student organization at PWIs. The following lines of inquiry guided this study: (a) How do Black undergraduate students at a PWI define the Black community? (b) What …

Second Victim Syndrome: Nurses Suffering In Silence, Matthew Riehm

Dissertations

Medication errors are inherent in health care due to human fallibility and inherent systemic complexities. Nurses are often unjustly blamed after committing a medication error despite the multitude of contributing factors. Formal education and healthcare organizations focus on preventing medication errors, but little has been done to support nurses involved in these tragic incidents. Recent cases, including RaDonda Vaught and Kimberly Hiatt, demonstrated the victimization of nurses after committing medication errors that plague the healthcare system potentially causing profound psychological trauma, often known as Second Victim Syndrome, SVS. There is limited research on the phenomenon of SVS in nursing due …

Impact Of Social Determinants Of Health On Skill Of Involvement: Differences In First Year Adn And Bsn Nursing Students In Rural Oklahoma, Cynthia Brown

Dissertations

The impact of Social Determinants of Health (SDOH) on Skill of Involvement (SOI) has not been adequately studied in nursing education. The skill of involvement is defined by Benner (2022) as necessary to expert-level nursing and it brings humanity, meaningfulness, acute situational awareness, and rapid thinking required for strong clinical decision-making in crisis management of the deteriorating patient. It is important for nurse educators to understand how SDOH impacts SOI on nursing students in order to transform the delivery of nursing education. The purpose of this study was to determine the impact of SDOH on SOIs in first-year nursing students …

Night Shift Acute Care Nurse Narratives: Exploring Collaborative Solutions To Reduce Burnout, Increase Morale And Engagement, And Improve Retention, Melissa Queen-Lomas

Dissertations

The COVID-19 pandemic’s effect on nurse recruitment and retention in the United States exacerbated the problem of nurse shortages, particularly for acute care nurses on the night shift. Long hours, heavy workloads, stressful work environments, high patient-nurse ratios, and dissatisfaction with administration are causing nurse burnout at an alarming rate. Burnout leads to low morale, exhaustion, intent to leave, and turnover. Moreover, exhausted night shift nurses compromise patient safety and care with unintentional medication errors or tasks left undone due to rigorous hours and little support or resources. Teambuilding, camaraderie, mentoring, and shared learning opportunities are scarce on night shift, …

The Association Between Emotional Intelligence, Empathy, And Social Determinants Of Health Among Accelerated Bachelor Of Science In Nursing Students: A Multi-State Cross-Sectional Descriptive Study, Kwanza Thomas

Dissertations

This study investigated the association between emotional intelligence (managing and understanding), empathy, and social determinants of health (SDOH) among accelerated Bachelor of Science in Nursing (ABSN) students. Despite the exponential increase in ABSN programs in the United States, little is known about the association between these variables among this nursing student population. A cross-sectional, correlational descriptive design was used to survey 104 students completing ABSN programs in Georgia, Mississippi, Philadelphia, and Texas. Participants self-reported their socioeconomic and programmatic characteristics using a researcher-developed questionnaire. Emotional intelligence (managing and understanding) was measured using two instruments, including the Situational Test of Emotional Management …

Improving Standardized Test Scores, Spatial Ability, And Interest In Math With The Introduction Of 3d Printers Into High School Math Classes, Charles Moore

Dissertations

Mathematics education faces significant challenges with declining ACT scores, national math proficiency rates, and a prevalent dislike for the subject among high school students. Spatial thinking ability, crucial for success in STEM fields, intersects with mathematical comprehension, suggesting a potential avenue for improvement. This study addresses these challenges by integrating 3D printing technology into secondary mathematics instruction. Employing a quasi-experimental quantitative research design, the study evaluates the impact of 3D printers on ACT math scores, spatial abilities, and attitudes toward mathematics. Results from ANOVA tests indicate marginal increases in spatial test scores and positive shifts in students' interest, self-confidence, and …