Digital Commons Network^™

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 …

Exposure To Videos Of Police Brutality Against Black Americans And Posttraumatic Stress Symptoms Among U.S. Adults, Ingrid Rauk

Dissertations

The purpose of this study was to examine in a diverse sample of U.S. adults the relationship between exposure to videos of police brutality against Black Americans and posttraumatic stress symptoms. Exposure to videos of police brutality against Black Americans is believed to have emotional and psychological effects on the viewer and may be considered an indirect (i.e., vicarious) form of exposure to trauma (Alang et al., 2017; Bor et al., 2018; Bryant-Davis et al., 2017). Prior research has established a positive association between experiences of racial discrimination and trauma symptoms (Kirkins et al., 2018). Previous research on psychological reactions …

Use Of Reddit For Social Science Research: A Review Of Current Use, Exploration Of Potential Sampling Error, And Practical Demonstration Using Reddit To Study Post-Pandemic Teacher Resignation, Caryn Davidson

Dissertations

This dissertation is comprised of three separate studies related to using the social media platform Reddit for social science research. The first paper provides an overview of current social science research that uses Reddit. The second paper explores the impact of sampling choices and potential sources of error when selecting Reddit data to study. The third paper maps the topics of a sample of posts tagged with the #Resignation flair in the r/Teachers subreddit from three months across school year 2021-2022 including reasons why teachers are leaving the post-pandemic classroom.

The practice of using Reddit for social science research is …

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 …

Exploring The Information-Seeking Behaviors And Decision-Making Processes Of Couples In Response To Unfamiliar Tornado Threats, Chih-Chun Rosie Lin

Dissertations

The unique disaster, tornado, causes significant damage and casualties in the US every year, and tornado warnings are crucial to helping people take protective action and reduce the negative impact, especially in an unfamiliar situation. It is important for authorities to better understand how households in low-risk areas rely on information, perceive risk, and make protective action decisions because tornadoes can occur in many geographic locations and might cause significant damage. However, tornado information search behavior and the dynamic decision-making process are not well understood in the existing literature. Therefore, this study aimed to explore the effect of the interaction …

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 …

How Prepared Are Educators To Work With Students Of Color, Ja're Thorn

Dissertations

From what I have experienced, there has been a lack of preparation when it comes to preparing educators to work with students of color. This research aimed to explore the importance of early childhood teachers’ cultural preparation programs when it comes to working effectively with students of color. Most of the time, teachers teach to the common core standards set in place by the state. They also implement a curriculum that is considered “best practices” for students instead of paying attention to and considering the individual student’s specific culture, family, and community values and ways of life before planning (Spies, …

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 …

Experiences Of Counselors Who Assist Women In Midlife Who Display Depressive Symptoms: A Transcendental Phenomenological Study, Carla Tovar

Dissertations

In this dissertation, I present a transcendental phenomenological study conducted with 12 counselors who worked with women in midlife who displayed depressive symptoms. The purpose of this study was to understand the lived experiences, clinical and personal, of licensed professional counselors (LPCs) who worked with women in midlife who displayed depressive symptoms. Through the study, I sought to recognize the essence and themes that emerged from these LPCs who worked with this population. Moreover, this study was designed to obtain a better understanding of how these LPCs managed their feelings and thoughts, how they helped when working with these women, …

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 …

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 …

Factors Affecting Changes In Road Traffic Collision Related Injuries And Deaths Over Time: The Global And The United Arab Emirates Perspectives, Yasin Jemal Yasin

Dissertations

Road traffic collisions (RTCs) cause 1.35 million deaths per year worldwide. Approximately 50% of these deaths were among pedestrians and motorized 2-3-wheeler users. In the United Arab Emirates (UAE), RTC deaths were higher compared to other high-income countries (HICs). The United Nations (UN) Decade of Action for road safety 2011-2020, aimed to reduce road traffic deaths by 50% by the year 2020. The aim of this dissertation was to investigate factors affecting changes in RTC-related injuries and deaths over time at global and UAE levels. Multiple research methods were used to investigate the research questions. Global data on pedestrian and …

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 …

Characterization And Genomic Analysis Of Two Escherichia Coli O157:H7 Bacteriophages Isolated From Pigeons, Mohamad I. Alolama

Dissertations

Enterohemorrhagic Escherichia coli, also known as EHEC, is a subset of Shiga toxin-producing E. coli (STEC), and it has recently been identified as one of the principal foodborne pathogens. E. coli O157:H7 is the most important serotype of STEC for its role in causing foodborne illnesses. E. coli O157:H7 could cause various gastroenteritis symptoms such as diarrhea, hemolytic uremic syndrome, hemorrhagic colitis, and thrombotic thrombocytopenic purpura and may cause death. Elimination of E. coli O157:H7 during food processing and storage is a possible solution. Bacteriophages have a significant impact on bacterial populations in nature due to their ability to …

Integrated Experimental And Dft Study Of Palladium And Nickel Metals Supported On Reducible Metallic Oxides For Selective Hydrogenation Of Alkynes And Dienes Bonds, Toyin Daniel Shittu

Dissertations

This dissertation investigates the capacity of ceria (CeO₂) to serve as a stand-alone reactive catalyst, and to act as catalyst support for different catalyst configurations. Experimental and density functional theory (DFT) approach were used to critically predict and to design ceria-containing catalysts. Ceria owes the catalytic propensity to the ability to undergo switch in the oxidation state from the +4 to +3 states. Motivated by experimental studies involving CeO₂ catalysts, defects CeO₂ surface with an oxygen vacancy (CeO2(111)_Vo) was used to explore the decomposition chemistry of methanethiol based on DFT. The potential formation pathways revealed that …

Coordinated Location And Capacity Planning Of Fast Charging Stations For Electric Vehicles Using Multi Objective Approach, Asna Madathodika

Dissertations

With the growing concerns on the energy depletion and CO₂ emissions, electric vehicles (EVs) have marked a new paradigm in the transport sector. Installation of publicly accessible charging stations (CS), namely fast CSs are crucial for the large-scale deployment of EVs. However, randomly placing CSs without prior research affect EV owners, CS operators and grid operators. For instance, the location and size of charging stations affect the accessibility and convenience of EV users since users prefer charging stations that are easier to access without much traffic congestion in road networks. At the same time station should offer good service …

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 …

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 …

Pathogen Risk Assessment On Arabian Felines In The United Arab Emirates, Laia Montserrat Stefano

Dissertations

The Arabian Peninsula has been known to harbour five species of felines, namely leopards (Panthera pardus), cheetahs (Acinonyx jubatus), caracals (Caracal caracal), sand cats (Felis margarita), and wildcats (Felis silvestris). Currently, their situation in the wild is critical in the region and ex situ breeding efforts are the greatest hope to restore their populations. However, these efforts need to go hand-in-hand with focus on their health, since pathogens are known to be a serious threat to animals under managed care. Globally, the potential pathogens of these five species include viruses, …

Structural Integrity Assessment Of Shell And Tube Heat Exchanger Tube-To-Tubesheet Joints Fabricated Using Conventional And Nonconventional Manufacturing Processes, Dinu Thomas Thekkuden

Dissertations

Tubes and tubesheets, integral components of shell and tube heat exchangers, have an important role in the functioning of the heat transfer between the tube-side and shell-side fluids. Tube-to-tubesheet joints act as a barrier to prevent the mixing of the transfer fluids in addition to aiding the structural rigidity of the shell and tube heat exchanger. Tube expansion process and welding are the manufacturing processes used for fabricating structurally rigid tube-to-tubesheet joints. Many instances of tube-totubesheet joint failures leading to the complete collapse of the heat exchangers demand attention to assessing the mechanical and metallurgical characteristics of tube-totubesheet joints fabricated …

Prevalence Of Metabolic Syndrome And It’S Associated Factors In Emirati Adults: The Uae Healthy Future Cohort Study, Shamma Jauaan Almuhairi

Dissertations

In the last few years United Arab Emirates showed a rapid growth in economic field which was associated with growth of other types of related diseases, specially in non-communicable disease; mainly type 2 Diabetes Mellitus (DM) & cardiovascular related diseases (CVDs). The presence of multiple risk factors simultaneously in Metabolic Syndrome (MetS) has been shown to increase the risk for atherosclerosis development in young and middle-aged adults. Metabolic syndrome (MetS) is clustering of cardiometabolic risk factors and has many different definitions according to different international organizations. Aims and objectives:This study has three main objectives; it aimed to estimate the prevalence …

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 …

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, …

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 …

Celiac Disease Prevalence And The Characteristics Of Celiac Patients In The United Arab Emirates, Two Centers Study, Asma Hamed Alnababteh

Dissertations

Celiac Disease (CD) is a chronic autoimmune gastrointestinal disorder caused by genetic susceptibility to gluten and affects around 1% of the population worldwide. CD can occur at any age and is diagnosed by detecting specific serological biomarkers and histopathological changes in the duodenal biopsy. In the United Arab Emirates, there is a lack of studies describing CD in children or adults; this thesis aimed at researching the epidemiology of celiac disease in among the populations in the United Arab Emirates.

Two Studies were conducted to achieve the research objectives, study one was conducted in Cleveland Clinic Abu Dhabi (CCAD) and …

Single-Case Pilot Study For Longitudinal Analysis Of Referential Failures And Sentiment In Schizophrenic Speech From Client-Centered Psychotherapy Recordings, Travis A. Musich

Dissertations

Though computational linguistic analyses have revealed the presence of distinctly characteristic language features in schizophrenic disordered speech, the relative stability of these language features in longitudinal samples is still unknown. This longitudinal pilot study analyzed schizophrenic disordered speech data from the archival therapy audio recordings of one patient spanning 23 years. End-to-end Neural Coreference Resolution software was used to analyze transcribed speech data from three therapy sessions to identify ambiguous pronouns, referred to as referential failures, which were reviewed and confirmed by multiple raters. Speech samples were analyzed using Google Cloud Natural Language API software for sentiment variables (i.e., score, …

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 …