Digital Commons Network^™

Irregular Domination In Graphs, Caryn Mays

Dissertations

Domination in graphs has been a popular area of study due in large degree to its applications to modern society as well as the mathematical beauty of the topic. While this area evidently began with the work of Claude Berge in 1958 and Oystein Ore in 1962, domination did not become an active area of research until 1977 with the appearance of a survey paper by Ernest Cockayne and Stephen Hedetniemi. Since then, a large number of variations of domination have surfaced and provided numerous applications to different areas of science and real-life problems. Among these variations are domination parameters …

Development Of Modeling Tools To Determine The Effects Of Customer Diversification On Customer Lifetime Value Volatility In Higher Education, Oscar Neal

Dissertations

As societies become increasingly global the competition for customers continues to increase. In competitive markets, it is important to identify a process to acquire and retain the most profitable customers. To discriminate customers, it is important to understand the value different customers bring to an organization. Much research has been done modeling customer value using customer lifetime value, however, there is limited research on the effect current customer diversity has on future customer lifetime value of future customer portfolios.

In this dissertation, a Lifetime Value Model considering the interaction between customer diversity, revenue management, and customer lifetime value in an …

Design And Implementation Of An Efficient Priority Queue Data Structure, James A. Rhodes

Dissertations

Priority queues are one of the most useful data structures. Research to improve the efficiency of priority queues is on-going in the field of Computer Science. We have designed and implemented a priority queue based on buckets that improves the performance of applications that utilize min/max heaps. The data structure improves an application’s insertion time and deletion time, and thus its overall execution time. We demonstrate the performance improvements in a wide variety of applications. Every one of the applications that we implemented is well-known, and important in the Computer Science field. We also demonstrate that the performance gains over …

Socially Aware Natural Language Processing With Commonsense Reasoning And Fairness In Intelligent Systems, Sirwe Saeedi

Dissertations

Although Artificial Intelligence (AI) promises to deliver ever more user-friendly consumer applications, recent mishaps involving fake information and biased treatment serve as vivid reminders of the pitfalls of AI. AI can harbor latent biases and flaws that can cause harm in diverse and unexpected ways. It is crucial to understand the reasons for, mechanisms behind, and circumstances under which AI can fail. For instance, a lack of commonsense reasoning can lead to biased or unfair decisions made by Machine Learning (ML) systems. For example, if an ML system is trained on data that is biased or unrepresentative of the real …

Design, Simulation, Modeling, And Implementation Of Triboelectric Nanogenerator (Teng) Sensors For Automotive Applications, Sam Ali

Dissertations

Triboelectricity is a promising technique for energy harvesting in which mechanical energy converts to electricity for powering small electronic devices. This method of energy harvesting serves as an alternative to traditional battery power sources and can significantly benefit low-power sensing applications by generating unlimited electrical energy. This study focuses on the development of flexible triboelectric nanogenerators (TENG) and energy harvesting devices for various applications in the automotive industry.

The study is organized into four projects. In the first project, various polymeric materials were used to investigate the performance of different TENGs. Four designs (D1, D2, D3, and D4) of flexible …

Experiences Of Female Muslim International Graduate Students With Children In The U.S.: Strategies To Cope With Academics And Family Life, Nizoramo M. Haitova

Dissertations

The literature on adult students, and in particular, graduate students with children, reveals that female students often struggle to balance their studies and home life due to juggling multiple roles. To date, research on student mothers has primarily focused on domestic students, with few studies examining the experiences of international student mothers, and even fewer studying Muslim international student mothers. The purpose of this study was to understand the lived experiences of female Muslim international graduate students with children in the U.S., as well as to explore the coping strategies they employ in both academia and family life. Thus, the …

Analysis Of U.S. Housing Markets Using Advanced Econometric Models And Machine Learning Algorithms, Cody Kirby

Dissertations

The Great Recession is the most recent reminder in U.S. history of the important relationship that exists between monetary policy and housing market activity. Since World War II, eight U.S. recessions have followed downturns in housing. A decline in the housing market results in the balance sheet deterioration of homeowners, financial institutions, private organizations, central banks, governing bodies, and foreign countries. The ability to understand the relationship between monetary policy and housing market activity, and to better forecast housing prices, allows for better planning by all economic agents.

This study answers the following research questions. (1) How have monetary policy …

Student Experience And Learning In A Course-Based Undergraduate Research Experience, Allison Witucki

Dissertations

Scientific research is advocated as an important experience for undergraduate STEM majors. Involving undergraduates in research early on in their educational careers can potentially prevent attrition and encourages students to pursue post-graduate education and careers within the field. However, research opportunities for undergraduates can be difficult to obtain. Many students may not realize that research opportunities exist, or there is limited availability for undergraduates to work in a faculty member’s research laboratory. Luckily, an educational model for involving scientific research in a course, also known as a Course-based Undergraduate Research Experience (CURE), can provide more widespread opportunities for students to …

Capturing Maximum Photovoltaic Power With Machine Learning: Maximum Current Prediction, Mppt Methodology, And Adjustable Ml-Based Controller, Zahi Mohamed Mohamed

Dissertations

The primary aim of this doctoral thesis is to examine the potential application of machine learning (ML) in optimizing Maximum Power Point Tracking (MPPT) and devising a flexible ML-based controller for photovoltaic (PV) systems. The lack of MPPT mechanisms leads to fixed voltage and current points for PV modules, resulting in substantial power loss when environmental conditions vary. The limitations of conventional and enhanced MPPT methods, as well as finding an alternative controller to classical Proportional-Integral (PI) controllers, have spurred the search for substitute approaches to maximize PV power. To address these limitations, this thesis proposes using ensemble ML techniques, …

Impact Of Teaching Mathematics With Four Teaching Strategies On Fifth Grade Students’ Learning Of Fractions Addition And Subtraction, Nabil Riziq Al Farra

Dissertations

There are different tools, resources, and materials that mathematics teachers may use to enhance the teaching and learning processes under many types of teaching strategies such as technology (e.g., videos and virtual manipulatives), real objects (e.g., concrete manipulatives), and other teaching strategies are traditional (e.g., lectures). Some of the most important things that a teacher has to consider is the students’ learning needs and how to reach to their minds by different teaching strategies with a variety of resources and assess which are more effective in students’ learning anddevelopment in mathematics.

The purpose of this study is to investigate the …

Lax Integrability And Solution Methods For The Nonlinear Schrödinger Equation With External Potentials: Exact Solutions And Applications, Laila Yahya Al Sakkaf

Dissertations

The investigation of a nonlinear differential equation (NLDE) integrability is the foundation for understanding and predicting the behavior of systems that are governed by that NLDE. The existence of a Lax pair (LP) representation is a reliable indicator of the indicator of the integrability of an NLDE. If an NLDE admits an LP, it is considered integrable in the LP sense, and this has important implications for the behavior and solutions of the system. The LP plays a crucial role in many powerful analytical solution methods for solving NLDEs. One such method is the Darboux transformation (DT), which allows for …

Community College Students’ Awareness Of Their Reading And Writing Proficiency, Martha Paulina Campusano Rojas

Dissertations

Student’s low reading and writing proficiency in higher education has been the subject of a large body of research (e.g., Bahr, 2011; Bailey, 2010; Carlino, 2005, 2010, 2012; Flink, 2017; Jaggars, 2014 Pacello, 2014; Perin, 2011; Perin et al., 2013).The purpose of this qualitative study was to explore how students in a first-year developmental Spanish course at the Dominican community college think of the connection between their reading and writing abilities and their performance in both their current and future undergraduate courses. The study also explored how these students view the importance of the developmental course and how they understand …

The Association Between College Instructors’ Trait Emotional Intelligence And Instructorstudent Relationship In A Uae Higher Education Institution, Salwa Habib Husain

Dissertations

The relationship between instructors and students in higher education institutions (HEIs) is a contributing factor to the students’ motivation to learn, emotional development and stability, and academic performance. The instructor’s trait Emotional Intelligence (EI) has been a focus in developing such positive relationships inside and outside the classroom setting. The extent to which instructors’ trait EI can contribute to a supportive and developmental relationship with students has not received due attention in research in the UAE. Therefore, the purpose of this study was to explore the association between instructors’ trait EI and the Instructor-Student Relationship at one HEI in the …

Development Of Innovative Multi-Drug Approaches To Counteract Illicit Drug Abuse In The Uae Population, Manal Ali Alhefeiti

Dissertations

The abuse of addictive substances is on the rise in the United Arab Emirates (UAE) population. Consequently, the UAE government spends about Dhs 5.5 billion annually on the rehabilitation of drug addicts. Blood, urine, and hair tests can reveal signs of sporadic or chronic drug use. Given the list of banned chemicals in the UAE, our main objective in this work was to develop a novel analytical method to identify and measure banned substances, especially prescription and over-the-counter drugs in the UAE. We developed and validated a rapid, sensitive and reliable liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) approach for the targeted …

Metal Oxide Based Materials For High Performance Supercapacitors, Hammad Mueen Arbi

Dissertations

Recent years have seen a healthy rise in the research and development of sustainable and renewable energy storage systems due to the pressing need to conserve natural resources and cut energy use. Due to the rapid growth in global population lately, there is a tremendous demand for energy to fulfill the ever-increasing needs. Innovative alternative energy sources and energy storage techniques are of tremendous interest for dealing with these current world issues. One promising solution for this is the recent research trend for achieving reliable and cost-effective high power and high energy density energy storage devices. On the basis of …

Optimal Component Sizing And Control Of A Multi-Source Elecctric Vehicle Based On An Improved Optimization Algorithm And A Novel Energy Management System, Prasanthi Achikkulath

Dissertations

Electric vehicles (EVs) are considered the ultimate solution for a sustainable transportation alternative to reduce the global warming and energy crisis. The public's perception of EVs is still adverse despite advancements in EV technology because of issues with driving range, high initial costs, the added weight of the energy source, and an unpredictably short lifespan of the EV system. To administer the same performance as compared to modern fossil fuel-based vehicles, hybridization of multiple energy sources is significant for EVs. The most pressing issues with multi-source EVs are optimum source sizing and regulating power flow from hybridization sources with the …

Approximate Computing Based Processing Of Mea Signals On Fpga, Mohammad Emad Hassan

Dissertations

The Microelectrode Array (MEA) is a collection of parallel electrodes that may measure the extracellular potential of nearby neurons. It is a crucial tool in neuroscience for researching the structure, operation, and behavior of neural networks. Using sophisticated signal processing techniques and architectural templates, the task of processing and evaluating the data streams obtained from MEAs is a computationally demanding one that needs time and parallel processing.
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/="/">This thesis proposes enhancing the capability of MEA signal processing systems by using approximate computing-based algorithms. These algorithms can be implemented in systems that process parallel MEA channels using the Field …

Ab-Initio Investigation Of 2d Materials For Gas Sensing, Energy Storage And Spintronic Applications, Saba Khan

Dissertations

The field of Two Dimensional (2D) materials has been extensively studied since their discovery in 2004, owing to their remarkable combination of properties. My thesis focuses on exploring novel 2D materials such as Graphene Nanoribbon (GNR), holey carbon nitride C₂N, and MXenes for energy storage, gas sensing, and spintronic applications, utilizing state-of-the-art techniques that combine Density Functional Theory (DFT) and Non-Equilibrium Greens Functions (NEGF) formalism; namely Vienna Ab-initio Simulation Package (VASP) and Atomistic Toolkit (ATK) package.
/="/">Firstly, on the side of gas sensing, the burning of fossil fuels raises the level of toxic gas and contributes to …

Nano-Supported Biocatalysts For Efficient Wastewater Remediation, Khadega Abobaker Al-Maqdi

Dissertations

The existence of various bioactive organic pollutants in wastewater and municipal water sources has raised concerns regarding their potential effects on human health. As a result, different techniques are being explored to effectively break down these persistent organic pollutants. Peroxidases have recently emerged as a new approach to remediation that may have advantages over traditional methods. However, evaluating the effectiveness of different peroxidases in breaking down various emerging pollutants can be time-consuming and difficult. In this study, a quick and reliable method was developed to test the degradability of 21 emerging pollutants by five different peroxidases (soybean peroxidase, chloroperoxidase, lactoperoxidase, …

Effect Of Fandom On Sports Gambling, Drake Deitch

Dissertations

The goal in this study was to investigate the relationship between fandom and betting. The hypothesis was that sports fans who gambled on their favorite teams would be more likely to make irrational decisions based more closely on emotional attachment than logical thinking. A total of 191 fans of the Chicago Bears (n = 80), Green Bay Packers (n = 57), and Minnesota Vikings (n = 54) were recruited for the study. Participants completed a survey that assessed their knowledge of and love for the three teams. Results indicated fans were far more likely to bet on their team regardless …

An Investigation Of The Impact Targeted Motivational Efforts And Leadership Styles Have On School Climate, Ashley Nichole Galloway

Dissertations

This dissertation explored the challenging nature school climate holds within the realms of organizational and building effectiveness among building leaders, staff, and students. Difficulties associated with organizational climate were identified. There are numerous factors that contributed to shaping school climate and school climate is also highly dependent on perceptions (McGregor, 1960). Through an interdisciplinary focus between targeted motivational efforts and administrative leadership styles, this study aimed to discover a new understanding of central climate and leadership factors which might lend to a more positive environment. Despite the substantial amount of critical work performed within this study, recommendations for future research …

Educational Intervention To Mitigate The Effects Of Bullying In The Student Nurse Population, Dawna E. Rutherford

Dissertations

Bullying behaviors are an unfortunate part of the nursing profession. Prominent organizations condemn behavior such as bullying, because of potential harm it could have upon nurses and healthcare. Researchers established the potential detriment of bullying to nurses and have investigated prevention interventions yet limited information regarding interventions for the student nurse population exists. Though complete eradication of bullying from the nursing profession is unlikely, nursing students need to have the appropriate skills to mitigate bullying behaviors.

The goals of the study were to: (1) analyze the state of the science regarding bullying interventions in the nursing profession, (2) evaluate the …

Objective Physical Activity And Sleep Characteristics Measurements Using A Triaxial Accelerometer In Eight Year Olds, Susan A. Harrington

Dissertations

Secular trends demonstrate that young children are less active and sleep less. Inequity in an individual's energy balance is known to have poor health outcomes. Academic achievement, academic behavior, and weight status are proxy indicators for health and psychosocial outcomes in this study. Current guidelines in place for sleep and physical activity in childhood are the result of data collected in the form of self-reports. Quantification and qualification of physical activity dimensions and sleep characteristics are essential not only for the purpose of clearly establishing parameters but also for the intent of verifying optimal health outcomes and evaluating interventions related …

Nurse Educators' Lived Experiences With Student Incivility, Myrna M. Williamson

Dissertations

Incivility is currently a topic of concern in nursing and higher education. There is a serious and growing concern on college campuses across the United States as many forms of incivility are occurring, ranging from offensive language and rude behavior to hostility and violent behavior.

The problem this study addresses is the need for specific information from nurse educators about their experiences with student incivility, and the subsequent impact of those experiences on teaching practices, job perception, and interactions with students. This study also addresses the problem by asking nurse educators their thoughts on contributing factors, warning signs, prevention and …

An Exploratory Study To Shape A Disaster Nurse Practitioner Scope Of Practice, Frances Dunniway

Dissertations

The impact and devastation from national disasters pose imminent risk to large populations. If trained in disaster response and following evidence-based practice standards, the Nurse Practitioner (NP) could be prepared to adapt to any setting or surrounding, utilizing their full educational and health care training. Currently there are no written guidelines during disasters to manage the various clinical conditions. Using a Delphi technique, this exploratory study investigated the multidisciplinary understanding about the disaster NP role. Key findings included: 1. Across four groups of disaster responders, there was confusion about the disaster NP role, indicating a need for role clarity. 2. …

A Multiscale Linkage Between Riverscape And Fish Community Coevolution, Loren W. Stearman

Dissertations

Sediment dynamics are foundational to stream and watershed morphology. Yet aquatic ecologists have relied on an oversimplified model of sediment dynamics characterizing sediments as agents of stream bed burial, and which fails to describe many types of aquatic habitat evolution. In this dissertation I employ both fluvial geomorphic and ecological frameworks to gain a deeper understanding of how sediment dynamics shape stream morphology and fish community evolution at multiple scales. Using a paired historic and contemporary approach, I analyzed geomorphic evolution and fish community change in the Bayou Pierre, Mississippi, from the 1980s to recent. Patterns of erosion due to …

Improving Recognition Of Depression Among The Older Adult Population, Keirstin E. Uomoto

Dissertations

Depression is a common mental health disorder faced by older adults that can go undetected and untreated. It was determined that the project site was not using a screening tool for depression among their patient population to identify or treat possible depression. The purpose of this quantitative, quasi-experimental quality improvement project was to determine if the implementation of Yesavage's Geriatric Depression Scale-15 (GDS-15) would impact the identification of risk factors for depression and the initiation of pharmacological treatment, follow-up, and referral to a mental health specialist among adults 65 and older.

Design And Fabrication Of Single-Chain Nanoparticles, Vitrimers, Bottlebrush And Comb Polymers, Logan Dugas

Dissertations

The introduction of novel dynamic exchange chemistries into polymer chains and networks has shown great potential of giving next generation polymeric materials. Within the scope of this thesis, dynamic chemistry is employed to realize single-chain nanoparticles, vitrimer networks, bottlebrush and comb polymers. CHAPTER I provides a broad introduction to the topics at hand, focusing upon the techniques utilized to achieve such materials with relevant literature and understanding of the techniques and architectures explored. CHAPTER II focuses upon the synthesis of single-chain nanoparticles via a copolymerization of polyisobutylene macromonomers with norbornene monomers equipped with pendant anthracene moieties. Through this work, the …

The Synthesis, Characterization, And Utilization Of Functionally Diverse Romp-Based Bottlebrushes, Cheyenne Liu

Dissertations

Bottlebrush polymers have garnered interest in many disciplines for their unique structure-property characteristics and potential applications. These polymers typically exhibit extended rodlike conformations as a result of sterically crowded side-chains. Further, extensive work has focused on expanding the synthetic toolbox for these systems, resulting in excellent molecular weight control, diverse functional group utility and corresponding stimuli-responsive behaviors. This dissertation examines both synthetic and stimuli-responsive tools in the context of bottlebrush systems.

A broad overview of bottlebrush characteristics, synthesis, and applications is discussed in CHAPTER I. CHAPTER II focuses on the use of a chain-transfer agent in the ring-opening metathesis polymerization …

Perceived Gender Norm Adherence In Women As Function Of Sex-Typical Facial Features And Surname Decisions, Kelsey Drea

Dissertations

Women’s retention of their surname following marriage has become increasingly common despite pervasive stereotypes of this stereotype as leading to relational failure. It could be possible that women’s physical appearance could buffer them from these stereotypes, particularly if that appearance is sex-typical. This study investigated how feminized facial structures could buffer women from negative perceptions of their abilities in relationships. Participants assessed a woman described as having changed or kept her surname. This woman’s face varied in her sex typicality (i.e., feminized, masculinized, unaltered). Feminine women appeared more modest when they kept their surname. Hostile sexism predicted less relational success …