Digital Commons Network^™

Academic And Demographic Predictors Of Retention And Persistence In Business Programs: Post-Covid Cohorts Of Traditional And Ncccs Transfer Students, Matthew K. Crump

Electronic Theses and Dissertations

This quantitative study examined academic and demographic predictors of first-year retention and major persistence among traditional first-year and North Carolina community college transfer students enrolled in undergraduate business programs. Guided by Tinto’s 1993 Model of Student Retention and Astin’s 1984 Theory of Student Involvement, the research focused on students who entered two AACSB-accredited institutions within the UNC System during Fall 2021, Fall 2022, and Fall 2023 as traditional first-year students or as transfer students from North Carolina community colleges.

Institutional data from the Banner Student Information System provided the basis for logistic regression analyses that examined predictors including high school …

Durable, Distributed Llm Inference On Cots Devices, Brycen E. Dunn

Electronic Theses and Dissertations

The advancement of Large Language Models (LLMs) has fundamentally changed the nature of natural language processing. The substantial memory requirements of frontier models creates a significant barrier to entry, centralizing inference. This thesis presents the design and implementation of a distributed inference framework designed to democratize LLMs by leveraging commodity devices. The framework combines the resources of heterogeneous COTS devices into a unified compute pool, enabling the inference of models exceeding a single device's memory capacity. A novel Task Partitioning Engine (TPE) analyzes model architectures, profiles node capabilities, and supports pipeline and expert parallelism strategies. The primary contribution is a …

A Machine Learning Framework For Early-Stage Cost Estimation Of Transportation Projects, Pritom Paul

Electronic Theses and Dissertations

To address the limitations of traditional planning-level cost estimating methods, such as reliance on statewide averages, heavy reliance on engineering judgment, and high levels of inaccuracy, this study developed two data-driven frameworks and corresponding tools. The first framework focused on resurfacing projects and used treatment-specific simple linear regression based on lane miles and geographic location. The second addressed a broader group of construction projects and used multiple linear regression with project length, route type, and right-of-way cost as key predictors. In both frameworks, the final estimates are computed by aggregating multiple estimates produced by county-, region-, and state-level models. The …

Discrete-Event Simulation: A Leslie System Model For Transportation Demography, Md Zobaer Ahammad

Electronic Theses and Dissertations

Transportation systems are influenced by demographic change, household formation,and patterns of vehicle ownership. These factors affect long-run transportation demand and congestion levels within urban infrastructure. Understanding how demographic dynamics interact with transportation behavior is therefore important for analyzing the long-term evolution of transportation systems. This thesis develops a modeling framework that integrates discrete-event simulation with a Leslie-type matrix model to study transportation–demography interactions.Simulation outputs are aggregated to construct a transition matrix describing changes in transportation states. This matrix acts as a linear (or affine) transformation on the transportation state vector, allowing the system to be analyzed as a discrete linear …

Beyond Moving Hands: Narratives Around Deaf Education, Sara Simpson

Theses and Dissertations

This qualitative narrative study explored the experiences and perspectives of deaf educators and educational interpreters working in high school settings. Participants shared narratives about their professional experiences, training, and roles in deaf education. By considering their professional histories, backgrounds, and cultural perspectives, this study examined how these experiences shaped participants’ perceptions of the current state of deaf education.

Using a qualitative narrative research design, three participants with experience working in high school deaf education settings were interviewed individually and later participated in a focus group discussion. The interviews and focus group centered on participants’ perspectives regarding key issues in deaf …

Decomposition And Spectral Characterization Of Unsteady Loads In Pulse-Jet Propulsion Testing, Cesar Benitez

Theses and Dissertations

Pulsed jet propulsion systems produce inherently unsteady forces whose time-resolved characterization is essential for performance assessment, yet the measured load signal conflates aerodynamic forcing with the dynamic response of the measurement balance itself. This thesis develops a load centered framework for the dynamic characterization of a pulsed jet system, treating the measured load fluctuation as the primary physical observable rather than attempting full true-thrust reconstruction. A single-degree-of-freedom balance model identified through ringdown testing provides the structural reference scale, yielding a natural frequency of 8.5 Hz and damping ratio of 18%. Power spectral density, phase-averaging, and synchronous–residual decomposition is applied uniformly …

Exploration Of Extended Chemical Reaction Networks, Ramiro Santos

Theses and Dissertations

Chemical Reaction Networks (CRNs) is a well-established model for analyzing distributed and concurrent systems. A central problem studied across CRNs is the reachability problem, which asks whether a target configuration can be obtained from a given initial configuration through a sequence of valid transitions. Classical CRNs are highly expressive but not Turing-universal; their reachability problem is Ackermann-complete, indicating extremely high computational complexity that nevertheless falls short of full universality.

In this thesis, we study Extended Models of Chemical Reaction Networks in which the dynamics of the system are modified. We analyze these models through two fundamental questions. First, simulation, we …

Vision-Language Guided Quadruped Navigation With Reinforcement Learning Control, Chen Yuan Wang

Theses and Dissertations

Large Language Models and their multimodal variants, Vision-Language Models (VLMs), can interpret natural language instructions and visual context. Reinforcement Learning (RL) methods such as Proximal Policy Optimization (PPO) have been shown to successfully learn stable quadruped locomotion. This work investigates whether a VLM integrated with an RL controller can control a quadruped robot to perform instruction-following navigation to a predefined target using text instructions, egocentric vision, and proprioceptive state.

Most VLM-based robotics work directly target prediction of robot actions from multimodal inputs. This approach often depends on large amounts of expert demonstration data, generated by controllers such as trained RL …

Examining The Effects Of Lateral Loading On Railroad Tapered Roller Bearings, Abel David Sanchez Trinidad

Theses and Dissertations

The loading conditions experienced by freight railcar bearings vary as a function of vehicle operating conditions. Under static conditions, bearings are primarily subjected to radial loads transmitted through the wheelset. During operation, however, track irregularities, braking events, railcar load imbalances, and curving introduce complex impact, longitudinal, and lateral forces in addition to the normal radial loading. These lateral forces increase friction within the bearing raceways, which could accelerate wear and potentially lead to premature spall initiation and propagation. While prior research at the University Transportation Center for Railway Safety (UTCRS) has demonstrated that vibration signatures can be used to detect …

Examining Professional Self-Doubt And Professional Quality Of Life Among Licensed Professional Counselors In Texas, Celia A. Ramos

Theses and Dissertations

Licensed Professional Counselors (LPCs) in Texas frequently navigate emotionally demanding work, including high caseloads, complex client needs, and sustained exposure to client distress. Over time, these professional demands can contribute to stress, emotional fatigue, and job strain, increasing vulnerability to burnout and reducing professional quality of life (Bardhoshi & Um, 2021; Maor & Hemi, 2021; McCarthy et al., 2010; Thompson et al., 2014). This quantitative research study examined the professional quality of life of LPCs in Texas using the Professional Quality of Life Scale (ProQOL) based on gender, ethnicity, age, licensure type, years of experience, does work setting induce compassion …

From Clicking To Committing: Psychological Distance And Persuasion In Online Animal Adoption Platforms To Enhance Shelter Visitation, David Goodweather

Graduate Theses and Dissertations (2019 - present)

Online animal shelter platforms have become a primary channel through which potential adopters view and evaluate adoptable animals, yet many users do not progress from online engagement to visiting a physical shelter. The dissertation examines how online pet viewing translates into intention to book a shelter visit by focusing on the roles of psychological distance and persuasive influence cues within a high-involvement decision context. Drawing on Construal Level Theory and persuasion research, a sequential process is proposed in which sustained interaction with pet profiles reduces distance-related abstraction, increasing receptivity to influence cues that facilitate movement from initial assessment to action. …

Using Siamese Neural Networks To Effectively Detect Trojans In Fpgas When Trojans Manipulate Encryption Operations At The Bitstream Level, Kylie Arnett

Graduate Theses and Dissertations (2019 - present)

This research investigates security vulnerabilities in Field-Programmable Gate Arrays (FPGAs) at the bitstream level, focusing on hardware trojans (HTs) that manipulate encryption operations. This study addresses two critical questions: (1) The feasibility of exploiting FPGA bitstreams to selectively bypass encryption operations when a predefined input pattern is observed (all ones), thereby exposing sensitive data, and (2) the efficacy of Siamese Neural Networks (SNNs) in detecting such trojans with high accuracy. FPGAs are vulnerable to malicious modifications during manufacturing or deployment, posing risks to data integrity and system functionality. In this work, a trojan is inserted into a Xilinx series-7 FPGA …

Polyglot File Detection For Forensic Investigations, Chase Stevens

Graduate Theses and Dissertations (2019 - present)

As technology has become far more ubiquitous over the years, so too has the amount of digital evidence that can and needs to be collected and processed. Forensic tools are developed in response to the growing need, but are limited to what they are programmed to do. One such forensic tool is Autopsy, one of the most widely used open-source tools. Autopsy uses known file-type signatures (e.g., headers, trailers) to identify and recover files from forensic images. Polyglot files introduce a unique problem to both these forensic tools and investigators alike. In the context of the research conducted, polyglot files …

Exploring Clinical Reasoning In Occupational Therapy Students Using Think Aloud During Computerized Patient Simulation, Candra Selene Talylor

Graduate Theses and Dissertations (2019 - present)

The objective of this research was to explore the effects of the think aloud (TA) method on the development of clinical reasoning in occupational therapy students completing an online simulation assignment. The study aimed to determine if thinking aloud develops clinical reasoning in occupational therapy students as evidenced by a change in clinical reasoning skill scores and investigates the relationship between students' overall clinical simulation competency scores.

This study used a mixed methods design, combining quantitative and qualitative data to explore and measure the use of the TA strategy on the development of clinical reasoning skills. The sample from this …

Detecting Sophisticated Cyberattacks On Public Water Infrastructure, Ayrton Purdy

Graduate Theses and Dissertations (2019 - present)

In recent years there has been an increasing number of cyberattacks on public water generation and distribution systems. Advanced persistent attackers could usurp sensors and control systems to contaminate public drinking water. In order to conceal their malicious activity, they can manipulate sensor data flows to give the appearance of normal activity. The compromised sensors would report normal chemical levels even though unsafe water is entering the distribution system. In response, this research proposes a multi-sensor, cross-comparison approach to anomaly detection. The proposed approach is designed to detect sophisticated cyberattacks which are not easily detectable using traditional cyber tools. The …

Developing A Framework For Microchip Design Recovery, Eric Diep

Graduate Theses and Dissertations (2019 - present)

Due to the increase in diverse chip production over the past decade, reverse engineering has become a difficult and daunting task. This research develops a methodology for microchip design recovery, seeking to validate and reproduce prior approaches to physical reverse engineering using low-cost tools and techniques. We used mechanical hardware abrasion tools and techniques to delayer and capture silicon integrated chip (IC) layout. We focused on the Mifare Classic EVl microchip, commonly implemented in public transit/transportation cards, to extract information for design recovery. The research explores limitations and advantages of mechanical abrasion and optical microscopy in context to modem chip …

Manufacturing Systems: Characteristics And Dynamics, Alan J. Fitzmorris

Graduate Theses and Dissertations (2019 - present)

This research answers three basic questions. First, what are the behaviors (dynamics) of a manufacturing system in the context of system performance? Are these dynamics best described as linear deterministic, periodic, nonlinear deterministic, or stochastic? Second, what are the complexity (chaotic) characteristics of a manufacturing system, namely the maximal Lyapunov exponent, correlation dimension, and Kolmogorov-Sinai entropy? Third, is there a relationship between complexity characteristics and manufacturing system performance? This research involves four high level steps: data analysis, system dynamics analysis, system complexity analysis, and correlation analysis. The data analyzed consists of concrete plant and shipbuilding shop time series performance data. …

Meikyu, Diana D. Dyer

Graduate Theses and Dissertations (2019 - present)

This thesis explores the relationship between digital and physical practices through the integration of traditional glassworking techniques and digital media. The project combines glass fusing and glass blowing with woodworking, screen printing, vinyl cutting, animation, and augmented reality (AR) technologies to create dialogue between physical and digital forms. This thesis documents the full creative process, beginning with conceptual sketches and progressing through the fabrication and assembly of glass components into finished sculptural pieces. Digital technologies are then incorporated to augment and extend the physical artwork. Three-dimensional (3D) assets were created using Maya, a 3D modeling software, and implemented within Snapchat's …

Perceptions Of The Teacher Excellence And Accountability For Mathematics And Science Act On Rural Secondary Math Teachers' Practices, Motivation For Professional Development, Collaboration, And Job Satisfaction, Katina Stallworth

Graduate Theses and Dissertations (2019 - present)

The persistent shortage of qualified secondary mathematics and science teachers in rural schools has prompted states to adopt incentive-based policies aimed at improving teacher recruitment and retention. In Alabama, the Teacher Excellence and Accountability for Mathematics and Science (TEAMS) Act was enacted in 2021 to address these shortages through substantial salary supplements tied to professional development requirements and the relinquishment of tenure protections. While early reports indicate that the TEAMS program has increased the number of credentialed STEM teachers in classrooms, less is known about how participation in the program influences teachers' instructional practices, motivation for professional development, collaboration, and …

Evaluating The Psychometric Validity Of Science Curiosity, Brooke Simila

Graduate Theses and Dissertations (2019 - present)

As political polarization and mass distrust in scientific consensus increases, psychologists have sought to understand individual differences that contribute to polarized political and scientific reasoning. One emerging concept in this area is science curiosity (SC), the disposition to seek and engage with scientific information for personal gratification (Kahan et al., 2017). A handful of studies have identified SC as an offsetting variable in politically motivated reasoning (Motta et al., 2021). However, the psychometric structure of SC remains underexplored; it is unclear whether SC represents a distinctive, unidimensional disposition or merely a manifestation of general curiosity traits. The purpose of this …

Narcissism And Eyewitness Identification, Haley M. Hearn

Graduate Theses and Dissertations (2019 - present)

According to the Innocence Project, 69% of individuals exonerated by DNA evidence were initially found guilty due to an eyewitness misidentification (Innocence Project, n.d.-a). A way that investigators attempt to prevent misidentification is by assessing how confident eyewitnesses are in their identifications. There is a large body of research suggesting that these confidence estimates can, in many instances, operate as reliable barometers of accuracy. However, what if an eyewitness is overconfident? Narcissism is a personality trait characterized by overconfidence. If a narcissistic eyewitness reports confidence in their identification of a suspect, should this report be trusted? Two studies were conducted …

Feeding Ecology In Coastal Systems, Randi L. Cannon

Graduate Theses and Dissertations (2019 - present)

Oysters (Crassostrea virginica) are critical foundation species in estuaries, providing numerous ecological and economic benefits. However, oyster populations have diminished worldwide. Effective oyster restoration and aquaculture require a mechanistic understanding of the physiological and environmental factors that govern oyster feeding, growth, and resilience under changing coastal conditions. We investigated how oyster ploidy and environmental conditions influenced oyster feeding and investigated how changes in abiotic conditions affected behavioral performance of oyster drills (Stramonita spp.), a key oyster predator. To better understand feeding responses and behaviors of both predator and prey we 1) used in-situ filter feeding assays to determine if feeding …

Career Aspirations Of Generation Alpha In A Changing World: Perspectives Of Students, Parents, And Educators In Religiously Affiliated Private Schools, Cynthia Susan Grace

Graduate Theses and Dissertations (2019 - present)

This qualitative case study served as a needs assessment to examine how students, parents, and educators perceived and influenced career development within a contemporary high school context, with particular attention to Generation Alpha as its oldest members entered secondary education. To contextualize the study, research on prior generations and evolving career trajectories was reviewed to better understand the shifting landscape shaping this cohort's development. The study was grounded in Social Cognitive Career Theory (SCCT; Lent et al., 1994) and informed by a values-based perspective of purpose, examining the interaction between individual beliefs, contextual influences, and emerging career pathways. Data were …

Big Feelings, Fast Decisions: Emotion Regulation As A Moderator Of Impulsivity In Binge And Emotional Eating, Emma G. Folk

Graduate Theses and Dissertations (2019 - present)

Emotion-driven impulsivity and difficulties with emotion regulation are both associated with maladaptive eating behaviors, including binge eating and emotional eating. However, it remains unclear whether broader emotion regulation difficulties intensify the influence of impulsive responses to emotional states on these behaviors. This study examined whether emotion dysregulation moderates the relationship between emotion-driven impulsivity and maladaptive eating behaviors. Participants were 266 adults (ages 18–65) who completed measures of impulsivity, emotion regulation difficulties, binge eating, and emotional eating. Moderation analyses were conducted using PROCESS in SPSS, controlling for body mass index (BMI) and gender. Negative and positive urgency were significantly associated with …

Transition Experiences Of Early Middle College Completers: A Grounded Theory Study, Sarah Louise Drabik Cheatham

Dissertations

Early middle college (EMC) students arrive at universities academically prepared yet institutionally undefined, occupying a space between traditional first-year and transfer student identities. Emerging through the Early College High School Initiative, EMC programs were structured to expand college access by embedding college coursework within the high school experience (Edmunds et al., 2012; Edmunds et al., 2017a; Haxton et al., 2016; Miller et al., 2013). Students frequently graduate from EMC with significant college credit, up to an associate’s degree, and demonstrate strong rates of post-secondary credential attainment and accelerated progress toward a bachelor’s degree (Edmunds et al., 2012; Edmunds et al., …

Enhancing Ransomware Resilience And Cybersecurity Preparedness In The U.S. Army, Katalina Marie Archiable

Honors Capstone Projects and Theses

No abstract provided.

The Impact Of Amateur Rocketry Velocity Estimation Methods On Coefficient Of Drag Calculations Used In Trajectory Simulations, William Louis Mcevoy

Honors Capstone Projects and Theses

No abstract provided.

Advertising The Noble Savage: Blackfeet Exploitation And Erasure Through Glacier National Park, The Great Northern Railway, And The Bureau Of Indian Affairs From 1900-1920, Edward D'Angelo

Undergraduate Honors Theses

The Blackfeet Native Americans have lived in and around Glacier National Park and their current reservation boundaries for thousands of years. They previously lived a nomadic lifestyle, but were forced onto a reservation by the American government in the nineteenth century. At the end of the nineteenth century and the beginning of the twentieth century, the Blackfeet sold more land to the federal government at the same time the Great Northern Railway was building its railroad through the Rocky Mountains. In order to increase travel demands on its railway in the area, the Great Northern Railway lobbied the federal government …

A Novel Method Of Protein Purification Using Hedgehog Proteins As An Inducible, Self-Cleaving Tag, Antonia Kladias

Undergraduate Honors Theses

Because removing extraneous purification tag sequences from native proteins can be challenging and costly, there is demand for simple all-in-one techniques that directly furnish a tagless, functional protein-of-interest (POI). Current tagless purification systems are based on intein biochemistry; however, intein-based purification requires expensive, specialized resins and the POI often must be fused to the intein’s C-terminus. In this thesis, I present a novel approach for tagless POI purification in which the Drosophila melanogaster hedgehog protein catalytic domain (HhC) is repurposed as a small-molecule inducible, self-cleaving element dubbed Gtag. With Gtag, the POI is fused to the N-terminus of HhC/Gtag with …

Retrospective Analysis Of Implemented Project Management Within A Small-Scale Student Engineering Project: Beng Fountain Wars Team Case Study, Holli E. Jenkins

Biological and Agricultural Engineering Undergraduate Honors Theses

This honors thesis provides a retrospective analysis of how the 2025 inaugural University of Arkansas’s ASABE Fountain Wars Student Team could be improved through project management. Project commitment, early stakeholder influence, rich communication, and a detailed project plan are all attributes of successful projects, and the team’s strengths and weaknesses within these categories were determined through a team poll. After the poll was conducted, three methodologies, Agile, Hybrid, and Waterfall, were assessed to determine how they would effectively address the team’s weaknesses. A weighted objectives table was created to compare each methodology’s effectiveness across the management categories. The analysis revealed …