Digital Commons Network^™

Statistical Inference Based On Elliptically Symmetric Distributions For Directional Data, Zehao Yu

Theses and Dissertations

Directional data arise in many scientific fields such as meteorology, oceanography, geology, zoology, and biomechanics. Geometrically, directional data lie in a spherical space. Although not in a spherical space, compositional data, such as microbiome data, can be mapped from a simplex to a spherical space via the component-wise square-root transformation. Other examples where compositional data emerge as a subject of interest include compositions of minerals in rocks, compositions of chemical mixtures, investment portfolios, and demographic composition of a population. This dissertation aims to develop inference procedures for analyzing directional data in general initially, with later focus shifted to the transformed …

Mathematical Modeling And Reconstruction Of Porous Media To Understand Transport Phenomena For Electrochemical System Applications, Mitchell Sepe

Theses and Dissertations

Alternative power generation has grown significantly in the space of energy production over the last ten years. Development of new technologies to produce energy is vital to the growing need for electricity. Batteries, solar panels, wind turbines, and countless other renewable energy options have been deemed necessary to create an overall greener future. Fuels cells when combined with electrolyzer show a promising system for stationary power generation. Both technologies are comprised of multiple parts in contact that must work together simultaneously to create an ideal environment for catalytic reactions to take place. A crucial component to a properly functioning cell …

The Impact Of Mathematical Justifications On Conceptual Understanding, Jessica Raley

Theses and Dissertations

Mathematical justifications offer an approach to which students deepen and extend their mathematical thinking. This process has the potential to enhance students’ conceptual understanding. Mathematical practices and process standards ask students to use critical thinking skills to justify their reasoning, but this is usually seen as proofs in high school geometry. This convergent mixed method research study aimed to increase students' use of writing mathematical justifications and investigate the influence of this practice on mathematical and conceptual understanding. Eleven eighth-grade students participated in the study conducted in the Midwest United States. Data were collected from semi-structured interviews, students’ artifacts of …

The Northern View Of The Southern Shore: Experience, Reconciliation, And Commemoration In Postbellum Charleston, South Carolina, Michael Edward Scott Emett

Theses and Dissertations

This dissertation explores the experiences and commemorative practices of nearly 200 northern passengers in Charleston, South Carolina, as they attended the flag reraising ceremony at Fort Sumter on April 14, 1865, and then organized the Sumter Club to celebrate that event annually. While some has been written about postwar Charleston during the first half of 1865, and a little more has been published covering this flag ceremony, the Northern view and their experiences with each have not been investigated, nor has anyone written an account of this club. This dissertation utilizes the theory and methodology of the history of experience, …

Demystifying The Choral Music Of Herbert Howells: A Pedagogical Approach Via Selected Works, Michael Ballard

Theses and Dissertations

The music of Herbert Howells is a mystery for many choral musicians. Howells’s popularity in England is unquestioned, but knowledge of his music has grown slowly in the United States. While the BBC Singers’ performance of Requiem in 1980 brought new enthusiasm for his music and the Requiem, he is still seldom performed in the United States outside of small circles which are generally in Anglican or Episcopalian communities. This is likely due to lack of exposure to his music and the perception that the music is inaccessible and mysterious. Some of Howells’s more complex music is inaccessible for …

Application Of Machine Learning Techniques And The Unscented Kalman Filter To Real-Time Gas Turbine Clearance Prediction, Donald Earl Floyd

Theses and Dissertations

The growth in renewable energy sources and retirement of large baseload coal-fired power stations has led to an accompanying decrease in reliability and security of the electrical grid. Since renewable energy sources are typically non-dispatchable, this can lead to blackouts and/or brownouts for customers. Heavy duty gas turbine power plants (HDGT) offer a solution to this problem. HDGTs are dispatchable, clean, and offer flexibility in the fuel they consume, but operational limitations must be well understood to fully exploit their benefits.

One of the main operational limitations is the tip clearances in the gas turbine. In many cases, the gas …

Sonic Data: Sonification In James Stephenson’S There Are No Words And David Kirkland Garner’S Red Hot Sun Turning Over, Nathan Lee Tucker

Theses and Dissertations

Sonification, or the transformation of data relations into sound, has inspired composers of orchestral and wind ensemble music over the past several years. Two of the resulting works included there are no words by James Stephenson and red hot sun turning over by David Kirkland Garner. Both works were analyzed, and their histories detailed in this study. Issues in American society and the American South such as gun violence, civil rights, and American Civil War monuments are revealed as inspiration for composers to map empirical processes onto sound. These musical protests against misinformation were shown to illuminate histories and correlations …

Associations Between The Use Of Ssri Medication In Older Adults And Cognitive Decline And Impairment, Paige Jones

Theses and Dissertations

Previous research has indicated that depression is a risk factor for dementia. Since SSRI medication is the most common treatment for depression, it is important to determine if SSRIs are associated with reduced dementia and better cognitive outcomes. Using longitudinal data from the 2004-2014 waves of the Health and Retirement Study merged with the 2005 Prescription Drug Study, we examined potential associations between SSRI and TCA medication and cognitive impairment and cognitive decline. The study population consisted of 1,775 older adults who participated in the PDS in 2005. We found that SSRIs were associated with significantly higher odds of cognitive …

The Study And Development Of Autonomous Scarf Repair For Composite Structures: A Focus On Advanced Air Mobility Vehicles, Stephen Hilton

Theses and Dissertations

“I’m sorry I haven’t been able to truly give you a solution to thermoplastic repair” – Arnt. Director GKN Global Tech Center, 2023

The aerospace industry has a prevalence of composite materials due to their outstanding benefits to the mechanical properties of structures while serving to reduce the overall structure weight. With the development of the Advanced Air Mobility market, there is an anticipated growth in the number of composite structures. Also, with the manufacturing environment of the 21st century, these composite structures are more and more being made using thermoplastic composites that can be recycled at the end of …

Simulation Study On Count Data Based On Double Poisson Distribution, Chao Ma

Theses and Dissertations

This thesis delves into the double Poisson distribution. Regression based on the double Poisson distribution, as proposed by Efron in 1986, offers an alternative approach that allows for more accurate regression models when dealing with discrete data that exhibit either over- or under-dispersion compared to the Poisson distribution. In this thesis, two methods of calculating the exact double Poisson density are compared: one utilizes the exact probability with the normalizing constant c(mu, theta) by definition or the “finite sum” method, while the other employs an approximation of the normalizing constant c(mu, theta). Furthermore, a simulation was …

Fourth-Grade Music Students' Perceptions Of Music Improvisation: An Ethnographic Case Study, Ashley Elizabeth Cobb

Theses and Dissertations

I facilitated this ethnographic case study to better understand potential successes and difficulties music improvisation presents in music facilitating and learning from the student perspective. The purpose of this research was to examine my fourth-grade students’ perceptions of music improvisation via improvisatory music circles using the following guiding research questions. Regarding 30-minute improvisatory music circles: 1) How do fourth-grade students (a) define music improvisation, (b) respond to facilitator-selected improvisatory music activities during improvisatory music circles, and (c) make decisions while participating in improvisatory music circles? 2) How did those students’ perceptions change throughout data collection?

I collected data from five …

The Burden Of Belonging: A Case Study Of Black Students' Experiences With Linguistically Code-Switching Between Discourse Communities, Tanner Charles Slagle

Theses and Dissertations

This qualitative action research case study is focused on better understanding the complex and intricate nature of code-switching among Black students. In today’s educational climate, many Black students find themselves speaking one way with their closest friends and family members in front of the swing set and television and another way with their classmates and teachers in front of the blackboard. Due to systemic racism, schools today tend to place the burden of belonging on the youngest children of color rather than on the seasoned, and often privileged, adults who work with them. This dissertation is largely rooted in Gee’s …

Examining Systems To Improve Third Grade Literacy: Focus On Schools With High Poverty Index, Brenda Kelley

Theses and Dissertations

This improvement project was designed to ensure students enrolled in elementary schools with a high poverty index received literacy instructional strategies that promoted literacy achievement. When analyzing Graham County School data, I noticed third-grade students attending high poverty elementary schools were not achieving literacy success at the same rate as third-grade students attending low poverty elementary schools. An improvement team, consisting of myself, administration, and teachers at a high poverty elementary school implemented the improvement science framework to further study the root causes of this problem. Utilizing the six principles of the improvement science framework, problem focused and user centered, …

Unraveling The Impact Of The School-To-Prison Pipeline: Investigating Racial Disparities In Disciplinary Practices, Zelexis Croffie

Theses and Dissertations

This action research study sought to examine ways to narrow the racial discipline gap in South Carolina’s elementary schools. Employing both the Critical Race Theory and BlackCrit in schools as the theoretical frameworks, the research delved into the narratives of teachers in grades 3^rd through 5^th, exploring their encounters with school-based disciplinary practices. The study integrated Social-Emotional Learning and Culturally Responsive Teaching to ultimately uncover implicit biases held by teachers that positioned Black students as less innocent compared to their White counterparts. The primary focus was to investigate the relationship between teachers’ inequitable disciplinary practices and the …

Eco-Domestic Femininity: The Collapse Of Domestic And Wild In Southern Women’S Writing, Christina Xan

Theses and Dissertations

When the Agrarians set out to assert their definition of southern in I’ll Take My Stand (1930), they planted roots deep in the ground of the south that slowly wrapped its tendrils around its descendants. In the years that have followed, southern women have had to push back against these limiting boundaries. Their individual stories are linked by the communal lineage of the south, specifically the binary of domestic and wild. Traditionally, southern women have had to stay in the boundaries of the home, cultivating domesticity, ordering the space, and warming the hearth. The land itself, posed as opposite from …

Unraveling The Structure And Star Formation History Of Polar Ring Galaxies, Kyle Lackey

Theses and Dissertations

Polar ring galaxies (PRGs) are a fascinating subgroup of early-type galaxies (ETGs) consisting of a central host galaxy - typically E/S0 - surrounded by a ring of gas, dust and stars orbitting perpedicular to the major axis of that host. In order to estimate physical properties and origins of five such objects taken from Whitmore's 1990 PRC catalog, we conduct a photometric study in optical and infrared wavebands. Data are taken from SDSS, GMOS-S, HST-WFPC2, and SST-IRAC. Each object was decomposed into a host galaxy bulge, host galaxy disk, and polar ring, and each component was fit with a Sersic …

Automated Data-Flow Optimization For Digital Signal Processors, Madushan Thilina Abeysinghe

Theses and Dissertations

Digital signal processors (DSP), which are characterized by statically-scheduled Very-Long Instruction Word architectures and software-defined scratchpad memory, are currently the go-to processor type for low-power embedded vision systems, as exemplified by the DSP processors integrated into systems-on-chips from NVIDIA, Samsung, Qualcomm, Apple, and Texas Instruments. DSPs achieve performance by statically scheduling workloads, both in terms of data movement and instructions. We developed a method for scheduling buffer transactions across a data flow graph using data-driven performance models, yielding a 25% average reduction in execution time and a reduction of up to 85% DRAM utilization for randomly-generated data flow graphs. We …

The Impact Of A Professional Learning Community On Direct Care Staffs’ Self-Efficacy In Promoting Social—Emotional Learning Skills, Tiffany Drahota

Theses and Dissertations

This qualitative collective case study documented three early childhood educators’ participation in a professional learning community (PLC) focused on promoting children’s social–emotional skills. Particularly, it illuminated the impact of a PLC on the direct care staffs’ self-efficacy related to the promotion of the specified skills. Self-efficacy strongly predicts a person’s willingness to persist through challenges, attempt a new task, and exert sufficient effort toward completion. Self-efficacy is highly influenced by social factors including peer observations and discourse (Bandura, 1977). PLCs are a form of professional development that focuses heavily on social interactions such as communication, collaboration, and group goal setting …

The Impact Of Professional Development On 4th-6th Grade Science Teacher's Pck Of Argumentation And Science Teaching Self-Efficacy, Tiffany Fowler

Theses and Dissertations

With the 2015 change in science standards to align more closely with the Next Generation Science Standards, as the district STEM coach, I saw a need for professional development that addressed the lack of understanding and skill needed to teach the Science and Engineering Practices, specifically the practice of Scientific Augmentation. This mixed-methods action research study aimed to investigate the impact of professional development and coaching on 4th-6th grade science teachers’ pedagogical content knowledge (PCK) of scientific argumentation and their self-efficacy to teach scientific argumentation. Data collection consisted of (a) PCK of Argumentation Assessment, (b) PRIME PCK Rubric and observation …

New Techniques For Studying Ocean Eddy Dynamics In The Arabian Sea And The Gulf Of Mexico, Paul Andrew Ernst

Theses and Dissertations

Coherent vortices known as eddies are ubiquitous throughout the world’s oceans and are responsible for modulating regional climates via the transfer of heat, momentum, and salt. Two regions where eddies are particularly prominent are the Arabian Sea (AS) and the Gulf of Mexico (GoM). This dissertation advances the study of eddies in these regions by developing and employing new techniques in conjunction with remotely sensed data and high-resolution ocean models. These models focus particularly on lesser-studied eddy components at the subsurface and the submesoscale (below 25 km in radius).

The first component of this dissertation focuses on the Lakshadweep High …

How Latinx Students Experience A High School English Class In A Monolingual School District, Elisa Malinovitz

Theses and Dissertations

In an effort to address the needs of the fastest growing population at my school, I asked Latinx students to share their experiences of being in a monolingual English 2 classroom. Students also shared opinions about friendships, Latinx culture in school, and alternative methods of educating non-English speakers.

Through action research we can assess the exigencies of Latinx learners. Further study is needed to determine evolving needs and best practices for increasing the academic achievement for this population. Some possible solutions to Latinx students falling behind their hegemonic peers include incorporating Latinx culture in curriculum and school culture, as well …

Evaluating Gender Bias In An Early Reading Screener Of Word Identification Abilities, Donna Perazzo

Theses and Dissertations

Children who have difficulty learning to read, particularly those with a specific learning disorder in reading (SLD-R) are at risk for an array of adverse outcomes. However, children who are identified and receive reading interventions early perform better on social, emotional, academic, and behavioral outcomes relative to those who do not receive early identification and intervention. In response to the growing body of research that has developed on the importance of the early identification of children have difficulty reading, many states have mandated the screening of all children for reading difficulties, specifically dyslexia. However, with the development of new reading …

Therapy Use And Self-Stigma Of Seeking Help Among College Students Of Color, Rawle David Sookwah Ragoonath

Theses and Dissertations

Amidst rapid diversification of higher education student bodies, discrepancies in help-seeking relative to endorsed psychological distress have been noted among college students of color. The treatment utilization disparity exhibited by minoritized racial and ethnic groups attending college necessitates analysis of factors that impact help-seeking. Colleges have increasingly implemented multi-systemic interventions to address rising mental illness prevalence rates across college student demographics. Addressing treatment use disparities and implementing culturally competent services are foci of updated college mental health models. Empowering help-seeking is vital to promoting campus community health. Saint Arnault’s (2009) cultural determinants of help-seeking model (CDHS) posits the interplay of …

Systemic Moves, Individual Impacts: Narratives Of Best Practices In Supporting Immigrant Women In Rural Community Colleges In The Canadian Prairies, Katherine Jean Stevenson

Theses and Dissertations

Rural Canada is in decline, and as such has begun recruiting immigrants to rural areas to fill crucial labour gaps. This study explores the ways in which rural community colleges can best support immigrant women in Canada. Using narrative inquiry, it captures the voices of women who successfully completed programs in a rural community college in the prairies. The study reveals best practices in supporting immigrant women and highlights the importance of creating programming that is tailored to student needs to ensure success.

Using Differentiated Gamification To Teach Systems Interactions: Impacts On Ninth Grade Biology Students' Academic Achievement And Cognitive, Behavioral, And Emotional Engagement, Stephanie Morgan Ruiz

Theses and Dissertations

The purpose of this action research was to evaluate the impact of differentiated gamification on student cognitive, behavioral, and emotional engagement, and academic performance within the unit of plant and animal systems for ninth grade biology students. Scientific literacy is considered a key component of education, as it contributes to societal innovation, economic production, and an informed public. Comprehension of biological concepts and processes, such as plant and animal systems, provide a greater understanding of the living world, and contributes to overall scientific literacy. Although a vital component to science education and literacy, students continue to struggle with the concepts …

The Effect Of Voluntarily Disclosing An Earnings Surprise On Management Operating Decisions, Jonathan Gay

Theses and Dissertations

Prior research extensively examines the external implications of voluntarily disclosing an earnings surprise, yet the internal implications remain understudied. Using two experiments, I examine whether the preemptive voluntary disclosure of an earnings surprise influences management operating decisions. Drawing upon mental accounting and the realization effect, I predict that managers are more likely to make inefficient operating decisions when an earnings surprise is expected and that a quantitative, but not qualitative, voluntary disclosure will mitigate this value-sacrificing behavior. I find that managers are more likely to make inefficient operating decisions when a negative, but not a positive, earnings surprise is expected …

The Disruption Of Kinship: Interracial Relationships, Displacement, And Marginalized Mixed-Race Families In Korean War Literature, Hyunwook Kim

Theses and Dissertations

The Korean War (1950–1953) left a profound mark on the Korean peninsula, its people, and their diaspora, with its impact still felt today. Korean War literature serves as a vital source for understanding the war's social and cultural ramifications, particularly for marginalized groups, including military sex workers, mixed-race children, and mixed Korean adoptees. Emphasizing the role of interraciality in their experiences, the dissertation delves into literary representations that depict encounters between Korean women and American soldiers, leading to the formation of novel mixed-race families both within military camp towns in Korea and domestic spaces in the United States. While much …

On The Use Of Cfd Modeling And Analytic Methods To Describe Pressure Drop In Highly Dense Structured Adsorbents In Gas Separation Processes And Fundamentals Of Adsorption, Ryan Timothy Sanders

Theses and Dissertations

The scope of this work can be divided into two main thrusts on topics found within adsorption. The first, and primary, topic is the use of CFD and analytical modeling to describe the flow of gas through a parallel, structured adsorbent channel which is described in Chapters 1 and 2. Chapter 1 establishes a non-experimental methodology based on using a 3D Navier-Stokes (NS) computational fluid dynamics (CFD) model in lieu of experiments, for developing 1D axial pressure drop correlations for structured adsorbents with parallel channels. Chapter 2 utilizes the methodology established in Chapter 1 in order to develop a new …

“I’M Speaking”: Black Women Leading School Public Relations, Managing Communications And Personal Challenges, Keisa Gunby

Theses and Dissertations

Operationalizing feminist communication theory with a critical lens, this research analyzes virtual, semi-structured interviews with 13 Black women who are integral to impacting organizational culture through the brand management and narratives to the stakeholder groups of employees, parents and community members for a public school district. This study aims to describe the oppression and invisibility of Black women in school public relations and amplify their voices as they lead the communication, marketing, and promotional efforts in public school districts across the United States. The interview transcripts were analyzed utilizing NVivo software through the first round of coding initial and the …

Assessing Obgyn Residents’ Knowledge, Attitudes, And Current Practices For Carrier Screening, Aubrey Morgan Surian

Theses and Dissertations

Obstetricians and gynecologists (OBGYNs) are the main providers that order carrier screening on a regular basis, so it is important to understand their knowledge, attitudes, and current practices regarding this screening. There are two primary professional organizations that have established practice guidelines for carrier screening, the American College of Obstetrics and Gynecology (ACOG) and American College of Medical Genetics (ACMG). With the growth of pan-ethnic carrier screening, these guidelines have become remarkably different. This study aimed to assess resident OBGYN’s utilization of pan-ethnic carrier screening, discern any discrepancies between knowledge, attitudes, and current practices, identify possible practice resources that may …