Digital Commons Network^™

Behavioral And Neurophysiological Measures Of Speech Auditory Feedback Processing Impairment In Left Hemisphere Stroke, Stacey Sangtian

Theses and Dissertations

The purpose of this study was to identify behavioral and neural correlates of impaired speech auditory feedback processing in people with a history of left-hemisphere stroke (LHS). To do this, we used the altered auditory feedback (AAF) paradigm to externally induce speech errors by randomly shifting the pitch frequency of the online auditory feedback up or down at ±100 cents in 38 LHS and 27 neurologically intact control participants under two experimental conditions: 1) active vocalizations of a steady speech vowel sound “ah,” and 2) passive listening to the playback of the same self-produced vocalizations. Randomized control trials were included …

Literature As A Monument: Uncle Tom’S Cabin Reflecting The Morality Of A Nation, Shalane Parcenue Conrads

Theses and Dissertations

This essay studies the critical response to Harriet Beecher Stowe’s novel Uncle Tom’s Cabin by studying the novel’s critical reception from publication and into contemporary America to understand how the novel remains an institution of Civil War remembrance. In accepting the polemical status of Uncle Tom’s Cabin, as both a literary and historical document, I argue that the novel is a monument in American culture. In studying the wide spectrum of critical response to the novel since its publication, Uncle Tom’s Cabin becomes a social barometer that reflects the controversial race relations in the United States from the Civil …

Cocreating A Strength-Based Behavioral Intervention Plan With Twice-Exceptional Students: A Youth Participatory Action Research Approach, Kristy L. Garrett

Theses and Dissertations

Twice-exceptional students are dually identified as academically gifted and talented and learning or medically disabled. These students face greater challenges to success in school and often have social and emotional issues that require accommodations and supports beyond those available in the general classroom. These students may not be receiving social and emotional supports through IEP or 504 Plans, or these supports may use a deficit rather than a strength-based approach. This study used a youth participatory action research method to empower twice-exceptional students to cocreate a strength-based, behavioral intervention plan to help them self-modulate strong emotional responses that hindered their …

Covid-19 And The College Student Experience, Benjamin Cochran

Senior Theses

In March of 2020, COVID-19 consumed the globe, affecting individuals’ physical and mental health. Physical health disparities among states of different political affiliations became clearer as the pandemic continued unrelentingly, but mental health disparities were not. This thesis attempted to note any mental health disparities among college students in states of both political affiliations across the country through an online survey. The 23-question survey was completed by 97 undergraduates at six universities - three in liberal states and three in conservative states. Respondents at universities in the liberal states rated their university and the state in which it is located …

Extensions Of Discrete Choice Experiment Theory For Public Health, Farahnaz Islam

Theses and Dissertations

A discrete choice experiment (DCE) allows researchers to understand how individuals value characteristics of a product or service in hypothetical scenarios and the trade-offs these individuals are willing to make between these characteristics. DCEs quickly gained traction in public health but as more researchers utilized DCEs in broader contexts, several methodological questions have arisen. This dissertation addresses some of these gaps in the literature.

One critique of DCEs is whether individuals would make the same choice in reality as they claimed they would have made in the hypothetical scenario. Perhaps the most efficient way to evaluate the predictive value of …

Thermodynamic Assessment Of Chromium Corrosion In The Na-K-Mg-U(Iii, Iv) Chloride Salt, Jacob Allen Yingling

Theses and Dissertations

Thermodynamic descriptions of high-order molten chloride salt systems are essential for the development of fast molten salt reactor (MSR) technologies. However, a complete thermodynamic assessment of the essential Na-K-Mg-U(III)-U(IV) molten chloride salt with the most prevalent CrCl2 corrosion product has yet to be provided. This is remedied in the present work through application of the CALculation of PHAse Diagrams (CALPHAD) approach to the available thermodynamic data and new measurements that include differential scanning calorimetry (DSC) observations for previously unexplored two and three component chloride salt systems. Through these efforts, a unique approach was developed for the quantification of uncertainty in …

Cyclic Response And Liquidfaction Behavior Of Gravelly Soils, Pitak Ruttithivaphanich

Theses and Dissertations

Cyclic response and liquefaction behavior are soil mechanisms under earthquake conditions. The study of dynamic soil response is important to evaluate soil behaviors under dynamic loading for a wide range of strains. Soil liquefaction phenomena involving a significant reduction in the strength and stiffness of saturated cohesionless soils has caused catastrophic ground failure in numerous earthquakes. Liquefaction mostly occurs in sand, but liquefaction of gravelly soil has been observed. To date, only a few studies have focused on the liquefaction of gravelly soils; hence, research data is limited. This research aims to improve the understanding of cyclic response and liquefaction …

Mechanistic Insights Into An Iron-Responsive Repressor, Fep1, From Schizosaccharomyces Pombe, Allison Nicole Kimsey

Theses and Dissertations

Iron is an essential metal cofactor required for a variety of biochemical pathways in most living organisms. In recent years, the nonpathogenic fungi Schizosaccharomyces pombe has been used to study iron regulation and uncover the molecular mechanisms for controlling intracellular iron levels. Some of these regulation pathways are conserved with those of pathogenic fungi, making these studies applicable for the future development of antifungals that target iron homeostasis. In S. pombe, the GATA-type transcriptional repressor Fep1 is responsible for repressing iron uptake genes during times of iron abundance. Previous reports have proposed that the binding of an iron-sulfur (Fe-S) …

Liquid Phase Modeling In Metal Catalysis And In Zeolites, Subrata Kumar Kundu

Theses and Dissertations

Liquid phase processing is often desired for selective product formation, such as during catalytic conversion of biomass, and for purification of waste-water streams. Since the liquid phase environment influences the adsorption properties and reactivity of solid catalysts and porous materials, significant performance changes have been observed as a function of solvent properties for various industrial catalytic and separation processes. There is a need to better understand these solvation effects on processes at solid-liquid interfaces and to develop novel multiscale models that permit one to explore solvation effects on surface catalyzed reactions and during adsorption in porous media such as zeolites. …

Development Of Peptidomimetic Inhibitors Targeting The Polo Box Domain Of Plk1 As Potential Cancer Therapeutics, Jessy Mariam Stafford

Theses and Dissertations

PLK1 overexpression has shown to be associated with tumor progression and an unfavorable prognosis in a wide variety of cancer types. Interfering with PLK1 genetically and chemically induces apoptotic cell death in cancer cells thus confirming PLK1 as a validated anticancer target. From a drug discovery perspective, PLK1 offers two functionally distinct, essential, and interconnected target sites in one molecule. These are the ATP binding kinase domain (KD) and the unique Polo Box Domain (PBD), where the interplay between these results in dynamic structural regulation of catalytic activity and sub cellular localization. Since the KD is conserved among kinases and …

Sleep Challenges And Temperament Among Infants At Elevated Likelihood Of Autism Spectrum Disorder, Miranda Hope Foster

Theses and Dissertations

The current study used parent report in a prospective longitudinal design to examine the relationship between early sleep difficulties and temperament among infants with an older sibling diagnosed with ASD (EL-ASIB, n = 32), those born pre-term (EL-PT, n = 24) and those with no familial history of ASD (LL, n = 28) across the first year of life. At 3, 4, 6 and 12 months, caregivers completed the Short Form of the Infant Behavior Questionnaire-Revised (IBQ-R) (Putnam et al., 2014). To understand how sleep difficulties are related to temperament, a new scale of Sleep Challenges was created with items …

“Even The Little Things Matter:” A Phenomenological Study On Factors Impacting Student Motivation During And After Covid-Related Disruptions In Education, Jennifer Ferris-Crisafulli

Theses and Dissertations

The COVID-19 pandemic brought about unprecedented disruptions in education, as schools were forced to make a rapid transition to virtual learning in March 2020. Students’ motivation seemed to decline significantly during and after this virtual learning period, which ranged from months to over a year in various areas of the United States. This study seeks to understand the factors impacting student motivation during and after this virtual learning period.

This action research study was conducted using a qualitative, phenomenological approach. Data was collected from open-ended surveys and semi-structured interviews during Spring 2021 and Spring 2022. Data was analyzed through the …

Memristive Ising Circuits, Vincent James Dowling

Theses and Dissertations

Resistance random access memory (ReRAM) cells are emerging passive components showing great promise for applications in non-volatile storage, in-memory computing, and neuromorphic circuits, to name a few. Various experimental ReRAM cells have demonstrated excellent characteristics. This includes nanoscale size, short read and write times, and small energy requirements needed to manipulate the information. The main obstacles preventing the widespread adoption of ReRAM technology are significant device-to-device and cycle-to-cycle variability.

In essence, ReRAM cells are resistors with memory whose state (resistance) can be changed by an applied signal such as voltage. Many models were developed for describing their response. These range …

Human Activity Recognition (Har) Using Wearable Sensors And Machine Learning, Chrisogonas Odero Odhiambo

Theses and Dissertations

Humans engage in a wide range of simple and complex activities. Human Activity Recognition (HAR) is typically a classification problem in computer vision and pattern recognition, to recognize various human activities. Recent technological advancements, the miniaturization of electronic devices, and the deployment of cheaper and faster data networks have propelled environments augmented with contextual and real-time information, such as smart homes and smart cities. These context-aware environments, alongside smart wearable sensors, have opened the door to numerous opportunities for adding value and personalized services to citizens. Vision-based and sensory-based HAR find diverse applications in healthcare, surveillance, sports, event analysis, Human-Computer …

Predicting Therapists’ Intentions To Use An Innovation: The Role Of Innovation-Specific, Individual, And Organizational Factors, Jonathan KuʻUhoaepilipono Ahuna

Theses and Dissertations

Understanding factors that contribute to an individual’s decision to use an innovation can increase the public health impact of innovations in children’s mental health services. Objective. This study examined whether and to what extent therapists’ innovation-specific judgements (e.g., innovation is easy to use, socially desirable) were associated with intentions to use an innovation using constructs from one of the most robust theories of innovation use–the Unified Theory of Acceptance and Use of Technology (UTAUT). Method. Two aims were addressed using data collected from 95 therapists and 28 supervisors who participated in a multi-site cluster randomized trial. Therapists used either a …

Applications Of Machine Learning For Improved Patient Selection And Therapy Recommendations, Brendan Elochukwu Odigwe

Theses and Dissertations

The public health domain continues to battle with illness and the growing need for continuous advancement in our approach to clinical care. Individuals experiencing certain conditions undergo tried and tested therapies and medications, practices that have become the mainstay and standard of care in clinical medicine. As with all therapies and medications, they don't always work the same way and do not work for everyone. Some Treatment regimens, like Hydroxyurea medication, which is commonly administered to Sickle cell anemia patients, come with some adverse side effects due to the chemotherapeutic nature of the drug. This would be particularly disappointing if …

Too Feminine For Execution?: Gender Stereotypes And The Media’S Portrayal Of Women Sentenced To Death, Kelsey M. Collins

Theses and Dissertations

Traditional gender norms prescribing women as more nurturing and less aggressive than men have led to both the reluctance to view women as capable of violence, as well as a greater willingness to execute men than women in the United States. To make sense of the instances where women are sentenced to death, the media often pathologizes and/or demonizes them. Scholars have found that demonizing and dehumanizing those executed is a necessity to the implementation of capital punishment, both in cases of male and female defendants. To better understand how the news media have framed the gender and racial narratives …

High-Throughput Computation Of Interfacial Thermal Management Of Wide-Bandgap Semiconductors, Hao-Wen Chen

Theses and Dissertations

As semiconductor electronics, in particular high electron mobility transistors, get hot in operation, people are trying to incorporate different semiconductor materials to solve the problem of heat dissipation to maintain the device efficiency and performance. In this master thesis, two different packages, LAMMPS and almaBTE, that are focusing on micro-scale and atomic scale respectively, are used to simulate the heat transfer process across interfaces in two different scales. In the LAMMPS simulation, the research is exploring how the location of atoms and the thickness of interfacial layers will influence the interfacial thermal conductance. On the other hand, using the almaBTE …

Elucidating The Interdependence Of Motor-Cognitive Development And Performance, Thomas Cade Abrams

Theses and Dissertations

As the development of complex coordination and control (i.e., motor development) involves the integration of neuromotor, psychological, social, and cognitive processes (i.e., executive functions), a better understanding of how these processes are embedded and manifest across stages of development throughout the lifespan is needed. The long-term processes associated with the acquisition and development of motor competence (MC), specifically, effortful practice and performance of various locomotor and object control skills, provide direct mechanisms for contributing to executive function (EF) development via different learning-related (e.g., synaptogenesis, hippocampal neurogenesis) as well as exercise-related (e.g., exercise-mediated neurogenesis, angiogenesis) mechanisms. However, traditional MC assessments use …

Sources And Cycling Of Neodymium And Rare Earth Elements In The Arctic Amerasian Basin And Bering Sea, Brian D. Duggan

Theses and Dissertations

The isotopic composition of dissolved neodymium (¹⁴³Nd/¹⁴⁴Nd, expressed as εNd) behaves quasi-conservatively in the ocean and has been used as a palaeoceanographic tracer of ocean circulation. The εNd value of water masses is acquired—and often altered—during interaction with sediments along the margins; however, the processes involved in seawater εNd acquisition remains poorly characterized and quantified. Here we report the results of 349 Nd isotope and 354 rare earth element (REE) concentration measurements from 27 water column profiles across the Bering shelf and through the Arctic Amerasian Basin collected during U.S. Arctic GEOTRACES cruise HLY1502 (GEOTRACES section …

Inspiring The Imagination, Nathan Terracio

Theses and Dissertations

As someone who has been a life-long audience member and who has worked in over a hundred different theatres on countless different productions over the course of my professional career, I have always been fascinated by the process of creating art out of thin air. I have watched artists undergo careful planning only to have that work thrown out during the rehearsal or technical process, or even sometimes during the last preview performance. I have watched moments unfold on stage at the last minute with seemingly no planning or effort. I have seen the reactions of audiences to moments that …

Durability Enhancement Of Anion Exchange Membrane Based Fuel Cells (Aemfcs) And Water Electrolyzers (Aemels) By Understanding Degradation Mechanisms, Noor Ui Hassan

Theses and Dissertations

The past several years have seen remarkable progress in renewable energy sources such as solar and wind, showing excellent efficiency and significant cost reduction. The intermittent nature of renewable resources requires them to be integrated with energy storage systems that can hold or convert this excess energy into other forms. Though batteries have been the most popular, it is also possible to store the energy as chemicals and fuels, such as hydrogen (H₂). Hydrogen generation from water electrolysis has been receiving significant attention in recent years. Among the existing water electrolysis technologies, anion exchange membrane electrolyzers (AEMELs) are …

Embodied Participation In Digital Publics: Somnambulance, Surveillance, And The Construction Of Identity, Adam S. Padgett

Theses and Dissertations

In our current information landscape, routine surveillance has changed the nature of rhetorical engagement in public spheres. Scholarship in publics theory have done productive work to map out the complex field of discursive participation. Michael Warner has demonstrated how, through the circulation of common texts, people no longer have to be in public in order to participate in publics. However, in the wake of ubiquitous surveillance, this focus on publicness has offered little attention to privacy in publics theory. I argue that legal and postmodern theories of bodies-as-texts is problematic for reading and writing bodies online. Intersecting with embodiment and …

Belonging In Context: An Exploration Of Sense Of Belonging Among College Students, Ladonna L. Gleason

Theses and Dissertations

Feeling a sense of belonging is essential to human health and functioning and has been well documented in the literature. However, questions of context remain. Research in belonging has focused on social aspects of belonging, leaving broader contextual frames unexplored. There has been little work in identifying and differentiating the contexts in which belonging is experienced or in developing an understanding of how the experience of belonging differs across contexts. Current belonging theory lacks this important contextual perspective that could inform the ways in which belonging is constructed and reconstructed through disruption. With the advent of the COVID-19 pandemic, new …

When And Why Targeted Products For Underserved Consumers Backfire, Ruoou Li

Theses and Dissertations

As the demand for creating and embracing a diverse marketplace increases, marketing strategies that over-generalize the needs of different consumer groups are no longer viable. Thus, many brands and companies have begun offering inclusive products that accommodate the specific needs of historically underserved consumers (e.g., women, people of color). One important question for marketers to answer is how these inclusive products should be promoted to appeal to these previously undervalued consumers. While prior research suggests that consumers will favor products with more explicit descriptions of the target consumer (i.e., blatant targeting) because doing so makes the targeted identity salient, I …

Mimo Antenna Systems For Wireless Handheld Devices, Ahmed H. Abdelgawwad

Theses and Dissertations

Mobile communications have seen tremendous growths in the last decades in the form of smartphones, watches, wireless enabled Personal Digital Assistants (PDAs) and so on. The current and future wireless communication systems require high data-rate capabilities to support high speed needs of users in modern applications. Multiple-input multiple-output (MIMO) antenna systems have become the most promising candidate to support the increased data demand. Therefore, they have emerged as an integral part of the new 5G wireless standard. One key challenge regarding MIMO systems for the handheld is to be able to successfully accommodate multiple miniature platform integrated antennas within a …

Investigating Bifactor Models And Fit Indices For Unidimensionality: An Illustration With Method Effects Due To Item Wording, Elizabeth A. Leighton

Theses and Dissertations

The use of unidimensional scales that contain both positively and negatively worded items is common in both the educational and psychological fields. However, dimensionality investigations of these instruments often lead to a rejection of the theorized unidimensional model in favor of multidimensional structures, leaving researchers at odds for how best to treat their data. One modeling technique that has gained attention in recent years related to item wording effects is the bifactor model, which specifies a general construct that explains the covariation among all items, and two method factors that explain additional covariation among items with similar wording.

Recent applications …

Closed Form Implicitly Integrated Models For Computationally Efficient Simulation Of Power Electronics, Andrew Wunderlich

Theses and Dissertations

This work describes novel closed-form, implicitly integrated (CF-implicit) models of switched-mode power converters which feature implicit integration but require no iterative numerical solving algorithm for evaluation because they are explicitly solved prior to model execution. The derived models capture the large-signal dynamic behavior of the power converters, so their use and accuracy are not limited to any one set of operating conditions. These models can be implemented in any computational environment, including directly on an existing embedded controller as a digital twin. Since no iterative solver is required, the models are highly computationally efficient and have a very predictable worst-case …

Empirical Studies On Automated Software Testing Practices, Alireza Salahirad

Theses and Dissertations

Software testing is notoriously difficult and expensive, and improper testing carries economic, legal, and even environmental or medical risks. Research in software testing is critical to enabling the development of the robust software that our society relies upon. This dissertation aims to lower the cost of software testing without decreasing the quality by focusing on the use of automation. The dissertation consists of three empirical studies on aspects of software testing. Specifically, these three projects focus on (1) mapping the connections between research topics and the evolution of research topics in the field of software testing, (2) an assessment of …

Exploring African American Girlhood Perceptions And Experiences Of Self Esteem, Monica Wade

Theses and Dissertations

Furthering the cultural competence of counselors around emotional wellness for minority groups, this research explored the intersectionality of race and gender through counter storytelling of experiences of Black girlhood that are often not told. To fill the existing gap in literature describing perceptions of emotional wellness, I explored African American adolescent girls perceptions and experiences of self esteem for girls who participated in an empowerment organization called Dream Girls. This qualitative study used a phenomenological analysis to gain understanding of the influences that impact the way these adolescents understand themselves.