Digital Commons Network^™

Development And Validation Of An Automated Image-Based Framework For Bubble Size And Velocity Measurement In Centrifugal Nuclear Thermal Rocket Experiments, Olivia Williams

Theses

Accurate measurement of bubble size and rise velocity is essential for characterizing multiphase flow behavior in Centrifugal Nuclear Thermal Rocket (CNTR) experiments, where dynamic imaging conditions complicate traditional analysis methods. This thesis presents the development and validation of an automated image-based framework for extracting bubble equivalent diameter and rise velocity from high-speed experimental videos of injected gas bubbles rising through controlled liquid-filled volumes. Representative datasets include air bubbles injected into water and Sodium Polytungstate (SPT-3). The framework employs a staged analysis workflow with instance-level bubble segmentation using a Mask R-CNN model, secondary classification for detection verification, multi-object tracking, and velocity …

Intercomparison Of Remote Sensing Methods For Calculating Cn² Profiles, Isaiah Joseph Montgomery

Theses

Propagation of electromagnetic waves through the atmosphere is affected by turbulence. The impact of turbulence on wave propagation is characterized by the refractive index structure function (Cn²), which characterizes the intensity of fluctuations of the refractive index of air due to turbulence. Observations of vertical profiles of Cn² are essential for evaluating numerical model predictions. This study presents an intercomparison of Cn² derived from multiple ground-based remote sensing systems, including 915 MHz profiler, sodar, and a parameterized method that uses doppler wind lidar and radiometer. Results indicate that the sodar is the most accurate near- surface Cn² profiler, but above …

What Correctness And Faithfulness Cannot Tell You : Counterfactual Behavioral Diagnosis Of Rag Systems, Saif Raza Khan

Theses

Correctness and faithfulness are standard metrics used for evaluating Retrieval-Augmented Generation (RAG) systems, but they only describe the outcomes and do not surface the underlying behaviors behind them. The same scores can hide a number of underlying behaviors. They can hide whether a system relied on retrieval, answered from parametric knowledge, followed a near-miss context, missed the gold source or failed to use the retrieved evidence. The same scores can hide all of these. This thesis introduces a counterfactual behavioral evaluation framework that tests each query under five controlled context conditions and uses a gold-source coverage gate to identify whether …

Design And Characterization Of A Low-Power Bulk-Driven Two-Stage Ota In 65nm, 90nm, And 130nm Cmos Technologies For 0.4v-0.6v Biomedical Applications, Raihan Khan Akash

Theses

Biomedical instrumentation requires low-power amplifiers to maximize battery life. Due to threshold voltage limitations, standard gate-driven operational transconductance amplifiers (OTAs) require higher supply voltages. To overcome this, a differential bulk-driven two-stage OTA is introduced for low-power applications. The proposed topology is implemented in 65nm, 90nm, and 130nm complementary metal-oxide-semiconductor (CMOS), with supply voltages ranging from 0.4V to 0.6V. Key metrics such as DC gain, gain-bandwidth product (GBWP), phase margin, common-mode rejection ratio (CMRR), slew rate, power, and noise are measured. The analysis confirms the robustness of the low-power solution provided by the proposed topology.

Developing And Evaluating A Multidimensional Measure Of Pride In The Lgbtqia+ Community, Donovan Edward

College of Graduate Studies: Theses & Dissertations

Pride in LGBTQIA+ spaces has thus far been an ethereal concept with no universally agreed-upon definition. Previous literature frequently connects pride to traits such as resilience, comfort, confidence, and identity expression. This is a critical oversight, as most measures of LGBTQIA+ experiences focus on the negative aspects of queer experiences (e.g., vulnerability, victimization) or are created to evaluate non-LGBTQIA+ perceptions of LGBTQIA+ people, falsely characterizing this community in a deficit-based light. In response, this study aimed to offer a holistic definition of pride and develop a psychometrically sound measure of pride stemming from culturally salient expressions by using rigorous analytical …

How Does Language Influence Interest In Psychological Treatment?, Alexis B. Dixon

College of Graduate Studies: Theses & Dissertations

In 2022, approximately 59 million adults in the United States were diagnosed with a mental health disorder, and approximately half received mental health services (NIMH, 2023). Given the number of individuals whose mental health concerns remain untreated, it is vital to investigate mechanisms predicting treatment-seeking behaviors. Health literacy, which influences treatment-seeking, is largely absent from research on barriers to mental health treatment. Health literacy is related to readability, the ease of reading (Adkins & Singh, 2001), and jargon, the technical language used by professionals in a field (Shulman et al., 2020). Health materials are often written at a high reading …

Advancing Interoperability Through Governance And Sustainability: A Qualitative Comparative Case Study Of State Health Information Exchanges In The United States, Karterria Finkley

College of Graduate Studies: Theses & Dissertations

This study presents a comprehensive comparative analysis of state-level Health Information Exchanges (HIEs) across all 50 U.S. states and the District of Columbia, examining how governance structures, consent frameworks, funding models, and technical infrastructure influence interoperability maturity, sustainability, and adoption. Guided by Systems Theory and Donabedian’s Structure Process Outcome framework, the research employs a mixed-methods comparative case design integrating systematic documentary review, qualitative thematic analysis, and a policy-anchored analytic scoring methodology. Structural and policy characteristics were operationalized through standardized ordinal (1-5) metrics and aggregated into composite indices representing governance capacity, consent inclusivity, financial sustainability, and technical readiness. This approach enabled …

Math Toxicity: A Psychoanalytic Examination Of Blips And Belonging In Mathematics Education, Kimberly R. Kirstein

College of Graduate Studies: Theses & Dissertations

This dissertation examines how secondary mathematics education functions not only as a curricular and institutional structure but as a lived, relational, and affective experience for students. While mathematics education research has extensively documented patterns of achievement, access, and anxiety, far less attention has been given to how students come to experience mathematics as a site of threat, shame, and diminished worth. This study introduces the concept of math toxicity to describe the cumulative harm produced when mathematics operates as a gatekeeping mechanism that links performance to identity and value. Drawing on historical analysis, psychoanalytic theory, and autobiographical inquiry, this research …

The Efflorescence Of Apocalypticism (Imminent & Prepping Beliefs): Considering Informational And Motivational Regulatory Mechanisms, James T. Good Mr.

College of Graduate Studies: Theses & Dissertations

In the last quarter of the 21st century, apocalyptic beliefs emerged in scholarly and lay representations notably doubling over the last decade. With nearly forty percent of United States citizen reporting this belief, unfulfilled questions arose: What drives discrepancies in beliefs of an imminent end of the world? Additionally, what drives beliefs in the need to prepare for an end of the world? These individual questions were examined together in this study using Construal Level Theory (CLT) and Regulatory Focus Theory (RFT) in an attempt to identify how psychological mechanisms are significantly affecting the fluctuations, in these self-reported beliefs. A …

A Unified Automated And Explainable Ai Framework For Drug Discovery, Clinical Diagnostics, And Public Health Data Prediction, Lord Coffie

College of Graduate Studies: Theses & Dissertations

This thesis investigates the development of automated, explainable artificial intelligence systems to improve automated scientific discovery, clinical diagnostic support, and public health decision-making. Three independent yet thematically aligned studies were conducted across cheminformatics, radiology, and population health. Study A introduces an automated and explainable machine learning pipeline for Quantitative Structure–Activity Relationship (QSAR) modeling using RDKit-derived molecular descriptors. The pipeline performs systematic preprocessing, consensus-based feature selection (mutual information, random forest importance, RFECV), and benchmarks six supervised models—Random Forest, XGBoost, Support Vector Machine, Balanced Random Forest, EasyEnsembleClassifier, and a blended meta-ensemble, achieving AUC = 0.90 and accuracy = 0.83, while ensuring interpretability …

Independent And Interactive Effects Of Stack Height And Heel Width On Spatiotemporal Parameters, Knee Joint Kinetics, And Ground Reaction Forces During Running, Hao Cai

College of Graduate Studies: Theses & Dissertations

This study investigated the independent and interactive effects of stack height (SH) and heel width (HW) on lower-extremity biomechanics during running. Specifically, the study examined how variations in midsole geometry influenced spatiotemporal parameters, knee joint kinetics, and ground reaction forces (GRF). Twelve recreational runners (8 males, 4 females) completed treadmill running trials at 16 km/h under nine shoe conditions that systematically varied in SH (25, 45, and 65 mm) and HW (81, 93, and 105 mm). Lower-extremity kinematics were collected using a Theia3D markerless motion capture system, and GRF data were recorded using an instrumented treadmill. A two-way repeated-measures ANOVA …

Influence Of Footwear Geometry On Lower Limb Stiffness During Running, Hongjiao Duan

College of Graduate Studies: Theses & Dissertations

This study examined how footwear geometry, specifically stack height and heel width, influences lower-limb stiffness during treadmill running. Twelve recreationally active runners completed treadmill running trials at 4.44 m/s in nine prototype shoe conditions that differed in stack height (25, 45, and 65 mm) and heel width (81, 93, and 105 mm). Vertical stiffness, leg stiffness, and sagittal-plane hip, knee, and ankle joint stiffness were calculated from synchronized markerless motion capture and force data. A two-way repeated-measures ANOVA (stack height X heel width) was used to test footwear effects. Leg stiffness was not significantly affected by stack height or heel …

Impact Of Tactical Breathing On Marksmanship And Cognitive Function After Anaerobic Fatigue In Law Enforcement Personnel, Jackson D. Gilleland

College of Graduate Studies: Theses & Dissertations

Background: Tactical breathing is commonly used in law enforcement training to regulate stress, yet limited evidence exists regarding its acute effectiveness following physical fatigue. Purpose: To examine whether a brief tactical breathing intervention improves shooting performance and heart rate variability (HRV) following anaerobic fatigue in law enforcement officers. Methods: Thirty-eight officers completed baseline HR/HRV and a shoot/no-shoot scenario, followed by a maximal 500-m row and post-fatigue shooting. Participants were assigned to either a control group or a tactical breathing group, which received brief instruction and coaching before post-testing. Results: No significant between-group differences were observed for A-zone accuracy, shot time, …

Ai-Driven Penetration Testing For Arm Systems: A Comprehensive Framework With Experimental Validation, Matthew Ragsdale

College of Graduate Studies: Theses & Dissertations

The convergence of artificial intelligence and cybersecurity presents new opportunities for automated penetration testing capable of discovering, prioritizing, and remediating vulnerabilities at machine speed. However, deployment on resource-constrained ARM platforms remains unexplored despite ARM’s dominance in mobile, IoT, and edge computing with over 280 billion chips deployed globally. This thesis presents systematic experimental evaluation of AI-driven penetration testing across four paradigms—traditional machine learning, deep learning, large language models, and reinforcement learning—on three ARM platform tiers: Raspberry Pi 5 (8GB, Cortex-A76), Radxa ROCK 5B Plus (16GB LPDDR5 with NPU), and NVIDIA Jetson Nano (4GB with Maxwell GPU). The experimental framework generates …

Assessing Climate-Driven Shifts In Floral Resource Availability For Bees On Barrier Islands In The Southeastern U.S., Hannah Brown

College of Graduate Studies: Theses & Dissertations

Climate change can alter the timing of bee and angiosperm phenology, potentially reshaping the seasonal availability of floral resources for bee species. Although plant-pollinator phenology has been widely studied in temperate systems, less is known about these dynamics in subtropical coastal ecosystems, such as barrier islands in the southeastern United States. In this study, we examined climate-driven changes in bee activity and floral resource availability across 16 barrier-island sites spanning from Florida to Virginia. Using museum bee occurrence records, herbarium-derived flowering phenology models, site-specific floristic inventories, and published bee-plant interaction data, we estimated species-specific bee activity periods and daily floral …

Impact Of Religion On Mental Outcomes Among Racial/Ethnic And Sexual/Gender Minority Individuals, Braden J. Waugh, Michael E. Nielsen

College of Graduate Studies: Theses & Dissertations

Marginalized identities (Adams & Miller, 2022) are associated with elevated risks for negative outcomes (Ching et al., 2018; Kayode et al., 2024). Religion has been found to act as a protective and risk factor. Minority Stress Theory (Meyer, 2003) and Intersectionality Theory (Crenshaw, 1991) are used to examine the relationship between identity status and anxiety, prosocial tendencies (PT), and quality of life (QoL). One hundred fifty-two participants were primed with a religious or neutral stimulus, and then answered measures regarding these outcomes (GAD-7, Spitzer et al., 2006; PBIS, Baumsteiger & Siegel, 2019; WHOQOL-BREF, The Whoqol Group, 1998; IFS, Hammer & …

Swimming In Uncertainty: Filling Data Gaps And Providing An Educational Platform For Beach Water Quality At Tybee Island, Georgia, Lukas Roberson

College of Graduate Studies: Theses & Dissertations

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Swimming in beaches water contaminated with high levels of bacteria can make you sick. Current monitoring at the public beaches on Tybee Island consists of weekly monitoring and enumeration of fecal indicator bacteria that takes 24 hours for results. If the number of bacteria exceed regulatory limits, a public health advisory is issued, and affected waters are retested until …

The Effect Of Complexity Of Expert Testimony And The Presence Of A Defensive Rebuttal On Jurors' Decisions In Criminal Trials, Shelby E. Madden

College of Graduate Studies: Theses & Dissertations

Forensic science plays a critical role in criminal trials, yet forensic techniques vary in their reliability. Expert testimony, often held in high regard by jurors, can be a decisive factor in verdicts, but its influence is complicated by factors such as technical complexity, adversarial bias, and heuristic processing. The present study examined how the complexity of prosecution expert testimony and the presence of a defensive rebuttal influenced jurors’ decisions when presented with faulty forensic evidence. Participants (N = 142) were randomly assigned to one of four conditions in a 2 (testimony complexity: high v. low) x 2 (defensive rebuttal …

Emotion Regulation: The Effectiveness Of Reappraisal And Potential Benefit Of Music, Ezra J. Greidinger

College of Graduate Studies: Theses & Dissertations

Literature has supported potential benefits to cognitive reappraisal as a method of emotion regulation, as well as intentional music usage as an enhancer of these effects. It has been suggested that instruction be provided to individuals to use these methods, especially in highly stressed populations (Sakka et al., 2018). However, there has not been an experimental study to follow up on these claims. When instruction is provided, is cognitive reappraisal more effective than naturally developed habits in regulating anxiety, and would music enhance these effects? College students (N = 170) were randomly assigned to three treatment conditions: control, cognitive reappraisal, …

Some Assembly Required, Tanner Maxey

College of Graduate Studies: Theses & Dissertations

The dead do not carry their memory. We do. But when memory becomes the only way we can continue to hold on to our loved ones, how do we derive meaning from the fragments when memory begins to fade? Some Assembly Required examines loss as a condition in which meaning is no longer stable, but must be constructed from what remains. Through an interdisciplinary practice that combines ceramics, textiles, and installation, this work explores how domestic objects—once associated with care, function, and familiarity—can be transformed into fragile, unusable forms that persist as evidence of what has been lost. These objects …

Early Icu Physiological Subtyping From Time-Series Data: A Comparative Study Of Feature Complexity, Predictive Performance, And Model Interpretability, Rojeena Khadka

College of Graduate Studies: Theses & Dissertations

Intensive Care Unit (ICU) patients do not follow a single uniform physiological pattern. Patients admitted with the same diagnosis show different clinical trajectories over time making standardized classification and treatment approaches insufficient. The increasing availability of large-scale electronic health records in MIMIC-IV makes it possible to investigate such heterogeneity through data-driven approach that captures how physiology evolves during the early phase of ICU admission. This thesis compares two analytical pipelines designed to identify physiological subtypes from the first 48 hours of ICU time series data. This study then assesses how well these subtypes predict in-hospital mortality. The first approach, referred …

Another Day's Journey: Birthing Brilliance Through Culturally Relevant/Responsive/Sustaining Pedagogies, Letitice Johnson

College of Graduate Studies: Theses & Dissertations

This dissertation examines the implementation of culturally relevant/responsive/sustaining mathematics using hip-hop pedagogy with special education students. The theoretical frameworks for this include with Culturally Relevant Pedagogy (Ladson-Billings, 1995), Culturally Responsive Teaching (Gay, 2018), and Culturally Sustaining Pedagogy (Paris & Alim, 2014). Utilizing an autobiographical case study methodology, I examined the use of culturally relevant math tasks and hip-hop pedagogy with 3^rd grade students with disabilities. From this study, the following findings emerged: (1). Learning environments characterized by hope, empathy, and critical agency can be cultivated through the use of community resources and structured classroom norms that promote support, collaboration, …

Effects Of Composition, Nodularity, Pouring Temperature, Inoculation, And Mold Strength On Wall-Movement In Sgi Castings During Solidification And Cooling, Noah Brack

College of Graduate Studies: Theses & Dissertations

The iron-carbon casting alloy known as spheroidal graphite iron (SGI), nodular graphite iron, or ductile iron (DI) experiences complex volume changes during its solidification and cooling as graphite nodules and austenite form. These volume changes result in forces on the mold cavity walls and can deform the mold walls in cases when mold walls lack the strength to resist the deformation. This wall movement can cause the formation of casting defects such as swell, warped part geometry, and shrinkage porosity. Though this phenomenon has been studied in the past, it remains difficult to predict casting wall movement with existing data. …

Formalizing Asymmetric Control-Telemetry Separation In Distributed Industrial Control Systems, Andrew Manison

College of Graduate Studies: Theses & Dissertations

Distributed industrial control systems often place control and telemetry traffic on the same communication substrate even though the two workloads impose different requirements. Control paths need bounded request-response latency and predictable acknowledgement semantics, whereas telemetry paths benefit from scalable publish-subscribe fanout and tolerance for consumer-side delay. This thesis argues that, for the tested class of mixed workloads on shared commodity infrastructure, these communication roles should be separated architecturally rather than forced through a single protocol. To evaluate that claim, the thesis formalizes an asymmetric control- telemetry pattern and instantiates it in the Asymtra framework using gRPC for synchronous control and …

Effects Of The Menstrual Cycle Phase On Rpe, And Symptom Characteristics In Pre-Professional Female Soccer Players, Emily Potts

College of Graduate Studies: Theses & Dissertations

Hormonal fluctuations across the distinct phases of the menstrual cycle have been shown to influence physiological and psychological responses to exercise, with some evidence suggesting phase-dependent changes in symptom presentation and ratings of perceived exertion (RPE); however, findings remain inconsistent, and few studies have examined these relationships across an entire competitive season in female soccer players. The purpose of this study was to examine changes in RPE and menstrual symptoms across cycle phases, as well as the relationships between RPE and symptom reporting in pre-professional female soccer players. A total of 22 female soccer players (age 22± 1.85) were recruited …

Mirroring Memory: Material, Reflection, And Becoming, Nila Mojaveri

College of Graduate Studies: Theses & Dissertations

ABSTRACT

This thesis explores how memory shapes identity through material, reflection, and tactile processes. Drawing from my personal experience of migration from Iran and the emotional distance from home, the work examines memory as a shifting, layered, and embodied phenomenon rather than a fixed narrative. Through the use of mirror, clay, fabric, and paint, I investigate how materials can hold, reflect, and transform lived experience. Each material carries specific meaning: mirrors introduce fragmentation and reflection, clay records touch and grounding, fabric evokes softness and domestic memory, and paint creates atmosphere through layering and tone. Together, these materials form a visual …

Comprehensive Performance Evaluation Of Devops Infrastructure Under Dynamic Workloads, Abdulrazaq Mamud

College of Graduate Studies: Theses & Dissertations

This research aims to investigate performance optimization and reliability issues related to cloud-based computing environments through an analysis of three key infrastructure components: virtualized CPU resource management, distributed API rate limiting, and web server deployment architectures. This research combines machine learning and system experimentation as a way of exploring the impact of infrastructure-level behaviors on overall system performance and scalability. The first component of the research focuses on analyzing CPU Fragmentation in Virtualized Environments, where unbalanced workload allocation on Virtual CPU Cores causes increased tail latency, resulting in Service Level Agreement violations. Metrics are analyzed using the Random Forest classifier …

Sexual Dimorphism In The Immune Defense Mechanisms Against A Systemic Bacterial Infection In The Cat Flea (Ctenocephalides Felis), Ashley Lynch

College of Graduate Studies: Theses & Dissertations

Fleas defend against infection through the activation of both humoral and cellular innate immune responses. Previous research in female cat fleas demonstrated increased immune activity following a systemic bacterial infection. However, comparable data for males and sex-based comparisons are limited. In this study, we investigated differences in innate cellular immune responses between male and female cat fleas following systemic infection with Gram-negative Escherichia coli. Bacterial load was quantified using colony-forming units 24 h post-infection. Immune function was assessed via phagocytic index and capacity. Survival and total circulating hemocyte counts were evaluated across infected, sterile-injected, and untreated groups. Male fleas …

Feasibility Of Quantifying The Dosage Of Zycotherm In Its Modified Asphalt Binders, Susmita Acharjee

College of Graduate Studies: Theses & Dissertations

The quantification of low-percentage additives in asphalt binders is challenging due to their minimal concentration and the complex composition of the binder matrix. Zycotherm, a nano-organosilane anti-stripping additive, is typically used in very small dosages (0.05%–0.20%), making its detection and quantification particularly difficult. This study investigated the feasibility of estimating Zycotherm dosage in asphalt binders by examining chemical and rheological and moisture responses. Two asphalt binder grades, PG 64-22 and PG 76-22, were modified with Zycotherm at dosages of 0.05%, 0.10%, 0.15%, and 0.20% by weight of binder, along with corresponding base binders. Laboratory experiments were conducted using Fourier Transform …

The Monster Consuming American Education: An Ethnodramatic Exploration Of Standardized Testing And Student Stress, Jennifer Bagley

College of Graduate Studies: Theses & Dissertations

This study looks at how elementary students experience Standardized Testing, focusing on the emotional and physical effects of the Georgia Milestones Assessment System (GMAS). Most research on high-stakes testing focuses on scores, accountability, and policy, but fewer studies look at how students actually describe these experiences. Grounded in Cultural Studies and informed by Critical Pedagogy, this study examines how students interpret and make meaning of their testing experiences within the broader culture of accountability and standardized assessment. This study focuses on student voices to better understand what testing feels like for them and how they make sense of it in …