Radiation Effects On The Amd Versal Running An Automatic Modulation Classification Model, Allan D. Howe

Theses and Dissertations

With the recent increase of interest into artificial intelligence (AI), graphics processing units (GPUs) have been used as the main hardware architecture for AI computation. Because of their high power consumption and large size, it is necessary to consider other architectures to perform AI computing in outer-space where size, weight, power, and cost (SWaP-C) are tightly constrained. One such architecture is the Advanced Micro Devices (AMD) Versal Adaptive Compute Acceleration Platform (ACAP), which can achieve acceptable AI throughput at a lower power and size compared to a GPU. As the Versal ACAP gets used in space applications, it is necessary …

Modeling Comparative Judgments With Machine Learning, Monoshiz Mahbub Khan

Theses

Many tasks can involve analyzing data points and assigning unbound numerical scores or labels. However, without a well-defined standard or point of comparison, such data annotation can require significant cognitive effort from human judges. To mitigate this issue, I propose the use of comparative judgments. Comparative judgments involve pairs of data points and a comparative label instead of a direct one. This process would only ask the human judge to compare the pair of data points and decide which one should have a higher label, but would not ask for the exact value. Moreover, ranking or sorting based tasks with …

Predictive Modeling For B2b Cybersecurity Sales Optimization, Aya Alqawasmi

Theses

The B2B cybersecurity marketplace is characterised by long sales cycles, high organisational risk, and technically sophisticated decision-makers, conditions under which conventional rule- based lead qualification systematically misallocates sales effort. This dissertation develops, evaluates, and interprets a predictive lead-scoring framework for this setting, grounded in the Cross-Industry Standard Process for Data Mining (CRISP-DM) and applied to a synthetic B2B cybersecurity CRM dataset of 5,000 opportunities. Five classification algorithms — Decision Tree, Logistic Regression, Linear Support Vector Machine, Neural Network, and XGBoost — are benchmarked on accuracy, AUC, precision, recall, F1-score, and probability calibration. Logistic Regression is selected as the final model …

Effective Strategic Planning Processes Used By Construction Industry Companies, Melvin C. Porter Jr.

Walden Dissertations and Doctoral Studies

Strategic planning failures among small and medium-sized enterprises (SME) construction managers can lead to cost overruns, schedule delays, and operational inefficiencies that threaten organizational viability. SME construction managers who lack effective strategic planning processes face an elevated risk of project failures that jeopardize workforce stability and the long-term sustainability of the communities they serve. Grounded in hoshin kanri framework, the purpose of this qualitative pragmatic inquiry was to explore successful strategic planning processes and models used by SME construction managers in southeastern Virginia to improve operations and reduce project failures. The participants were seven SME construction managers who had successfully …

Risk Factors For Metabolic Syndrome Among U.S.-Born And Non-U.S.-Born Hispanics In The United States, Banessa Maldonado

Walden Dissertations and Doctoral Studies

Current knowledge regarding risk factors for metabolic syndrome (METS) among Hispanic individuals of Mexican descent remains limited. Using data from NHANES 2017–2020, this study compared factors contributing to METS and included U.S.-born and non-U.S.-born Hispanic adults of Mexican descent aged ≥ 18 years living in the USA (N = 949) with assessed METS. Grounded in the social ecological model and social determinants of health, this research evaluated dietary habits, lifestyle patterns, and acculturation processes using multivariate logistic regression and stratified analyses. Educational attainment was associated with METS, but the association was not statistically significant in adjusted models p = 0.528. …

Strategic Organizational Growth In Nonprofit Organizations: A Swot-Based Change Management Analysis, Sharika Williams

Walden Dissertations and Doctoral Studies

Nonprofit organizations often face operational and sustainability challenges. This study examined a nonprofit serving individuals with intellectual and developmental disabilities that was experiencing increased service demands, communication challenges, and workforce shortages. The purpose of this generic qualitative study was to develop a sustainable strategic change management approach to strengthen workforce development, financial stability, stakeholder collaboration, and strategic planning. Guided by the research question, "How can the client nonprofit organization implement a sustainable change-management approach that addresses internal communication challenges and resource constraints while maintaining mission alignment?" the study used a SWOT analysis and Kotter’s eight-step change model. Data were collected …

Effectiveness And Ethics Of Biometrics In Homeland Security, Aaron Akintayo Akindiya

Walden Dissertations and Doctoral Studies

Homeland security agencies increasingly deploy biometric technologies, including facial recognition and fingerprint scanning, to enhance identity verification and threat detection at airports and borders. However, these technologies raise ethical concerns regarding privacy, algorithmic bias, data protection, and civil liberties. Limited research captures the perspectives of frontline professionals who implement these systems. This study explored how homeland security professionals perceive the balance between effectiveness and ethics. Guided by the technological determinism theory, semistructured interviews were conducted with 13 professionals from U.S. Customs and Border Protection, Transportation Security Administration, and Immigration and Customs Enforcement. Thematic analysis revealed four themes: effectiveness in enhancing …

Enhancing Staff Knowledge Of Prenatal Depression Screening And Follow-Up Protocols, Gladys Ajohmbu Esunji

Walden Dissertations and Doctoral Studies

This staff education project addressed inconsistent staff knowledge of prenatal depression screening and follow-up protocols in an outpatient behavioral health practice serving prenatal patients. Prenatal depression is a nursing practice concern because delayed identification and inconsistent follow-up may affect maternal well-being, infant outcomes, family functioning, and timely access to behavioral health support. The practice-focused question was: According to the evidence, among clinical staff in an outpatient maternal mental health setting, what is the impact of structured staff education on adherence to prenatal depression screening on follow-up protocol knowledge? The purpose was to improve clinical staff knowledge through a structured education …

Secondary English Teacher Experiences Implementing Culturally Responsive Teaching With Black Students In Maryland, Angela James

Walden Dissertations and Doctoral Studies

Despite state mandates requiring culturally responsive teaching (CRT) implementation, the problem addressed by this study was that urban high school teachers are not consistently integrating CRT practices with Black students in Reading/English language arts (RELA) courses. Guided by the CRT framework, the purpose of this basic qualitative study was to explore the experiences of urban high school teachers with incorporating CRT practices with Black high school students in RELA courses in Maryland. Data were collected through semistructured interviews with 10 RELA teachers. Through open coding, the following three themes emerged: the need for increased and targeted professional development, structured opportunities …

Exploring Successful Change Strategies For Small Business Owners To Remain Competitive, Omari Akuamoah Boateng

Walden Dissertations and Doctoral Studies

Small businesses are vital to the U.S. economy but face significant challenges in implementing organizational change to remain competitive due to resource constraints. This problem is important to small business owners because ineffective change strategies limit growth, sustainability, and broader economic contribution. Grounded in the resource-based view of the firm and entrepreneurship theory, the purpose of this qualitative pragmatic inquiry project is to explore the evidence-based organizational change strategies used by some small business owners in the United States to achieve and sustain a competitive advantage. The participants were 6 leaders from small businesses with fewer than 100 employees located …

Global Humanitarian Aid Sector Leaders’ Perceptions Of Leadership Development Programs To Support Humanitarian Aid Workers, Stephen J. Thomspon

Walden Dissertations and Doctoral Studies

The problem addressed through this study is that current leadership development programs for global humanitarian aid sector (GHAS) leaders fail to adequately address the unique circumstances of humanitarian aid work. Grounded in trauma-informed care and adaptive leadership, the purpose of this basic qualitative study was to explore GHAS leaders' perceptions of the essential components and opportunities for improving leadership development programs, as well as their recommendations on how to address the unique contexts of humanitarian aid workers. Semistructured interviews with eight GHAS leaders who had at least 10 years of sector experience were conducted. Through qualitative content analysis with a …

Epigenetic Regulators Mll3 And Mll4 Sustain Hematopoietic Stem Cell Multipotency, Helen Chenwei Wang

Arts & Sciences Graduate Student Theses and Dissertations

Hematopoietic stem cells (HSCs) maintain lifelong blood production by balancing self-renewal and multilineage differentiation. They are sustained by networks of transcription factors and epigenetic regulators that prime lineage-specific programs while simultaneously preventing activation of any one program up until the moment of lineage commitment. Despite extensive study, it remains unclear how these complex transcriptional programs are coordinated and how specific epigenetic regulators are deployed to reinforce specific cell fate decisions. Epigenetic regulators, MLL3 and MLL4, play a central role in pluripotent embryonic stem cell fate transitions, but their functions in multipotent somatic stem cells are less well characterized. MLL3 (also …

Military Culture And The Student Veteran: A Mixed Methods Study Of Service Members Transition Into Higher Education, Joanna Fagan

Clinical Psychology Dissertations

Military veterans are entering higher education spaces at a steady rate. While their visibility on U.S. campuses is increasing, these veterans face various challenges in entering higher education. This mixed-methods study examined the relationships among military identity, trauma exposure, and psychological functioning in student veterans, with a focus on meaning in life, life satisfaction, and social engagement. Quantitative data was used to assess correlations and associations between meaning making, military identification, satisfaction with life, and college involvement, while qualitative data were used to contextualize and extend statistical findings. Results indicated that military identity was positively associated with meaning making but …

Development Of Computational Imaging Pipelines To Advance Virtual Pet Imaging Trials, Suya Li

McKelvey School of Engineering Graduate Student Theses & Dissertations

Positron emission tomography (PET) provides functional information that is essential for disease diagnosis, treatment assessment, and biomedical research. However, the development and validation of PET imaging methods often require simulated imaging data with known ground truth, as well as large clinical datasets that are realistic and scalable. These requirements are difficult to satisfy using clinical studies alone, motivating the development of virtual PET imaging techniques. Physics-based simulation can model PET acquisition with high accuracy, but its computational cost limits its large-scale usage. Meanwhile, conventional digital phantom-based image generation approaches often lack the anatomical diversity and heterogeneous tracer uptake patterns observed …

Talking Teaching For Change: How Productive Teacher Collaborations Contribute To Teacher Efficacy Beliefs And Student Achievement Gains, Xiaohang Zhang

Theses and Dissertations

Teacher collaboration and teacher efficacy beliefs are complex, multifaceted constructs that play critical roles in student learning and influence one another in multiple ways. School collaborative culture, including collegial trust, collective learning, and shared responsibility, has also been identified as an important factor shaping both effective teacher collaboration and teacher efficacy beliefs. This study employed a sequential explanatory mixed-methods design to (a) examine the relationships between features of collaborative discourse and teachers' instructional efficacy beliefs, as well as the extent to which school type and school collaborative culture influence these relationships, and (b) explore how these collaborative discourse features are …

Equivocation Analysis Across Continuous And Discrete Memoryless Channels, Md Munibun Billah

Theses and Dissertations

Physical-layer security uses the noise already present in the channel to keep a message secret without making any assumption about the eavesdropper's computing power. In Wyner's wiretap channel model, coset coding uses randomness to map the message to many codewords and protects against information leakage from an active eavesdropper. The secrecy provided by such codes is measured by their equivocation, which is the eavesdropper's remaining uncertainty about the message after she observes her channel. So computing equivocation is an important aspect of analyzing the wiretap channel model. Many channels of practical interest have no closed-form expression for equivocation, and exact …

Accurate 3d Computational Modeling Of Multiphase Flows In Boiling Heat Transfer, Winston O. James Iii

Theses

In the past ten years, the electronics industry has seen a sustained demand to reduce thermal resistances while increasing volumetric heat removal. The limitations of traditional air-cooled systems have caused a major industry shift toward liquid cooling. To maintain beam quality, high output efficiency, and continuous uptime, high-powered lasers require cooling to manage the waste heat of 5-55 kW. Small modular nuclear reactors (SMRs) have a capacity of 350 MW or less per unit and operate at an efficiency of 33.4% to 45%. As a result, 55% to 66% of the heat generated must be dissipated. Within data centers, a …

Bridging The Gap: Using A Regional Pediatric Intensive To Improve Rural Nursing Students’ Self-Efficacy, Hannah J. Sasser, Will Brewer

Theses

Abstract

Introduction: Valuable clinical learning opportunities is essential, yet often an unmet goal in nursing education, especially within rural associate degree nursing (ADN) programs, where access to high-acuity and diverse clinical experiences is limited.

Background: Nursing students in geographically isolated areas face limited access to specialty clinicals, including pediatrics, creating inadequacies in clinical learning and preparedness (Institute of Pediatric Nursing, 2021).

Purpose: The purpose of this project was to evaluate the effect of a two-day pediatric intensive, incorporating simulation scenarios and micro-learning activities, on the self-efficacy and satisfaction with learning of students in a rural ADN program. …

A Dynamics Viewpoint On The Approximation Capabilities Of Infinite-Depth Neural Networks, Andreus Brammer

Electronic Theses and Dissertations

Neural Ordinary differential equations(Neural ODEs) provide a continuous-time framework for learning dynamical systems by representing the evolution of a state variable through a parameterized differential equation. While most existing methods rely on numerical time stepping methods during training such as RK4, this work investigates an alternate spectral framework where both the solution and the time-dependent network parameters are represented by global polynomial expressions.

Two methods are employed: the first uses Taylor series representations, and the second approach uses Chebyshev polynomial expansions together with fast spectral transforms and efficient polynomial multiplication techniques. In each formulation, the Neural ODE is transformed into …

Exploring Caregiving Choice In The Adult Cancer Population, Jennifer L. Huggins

MUSC Theses and Dissertations

ABSTRACT Purpose Although extensive research examines family caregivers (FCs) across populations, less attention has been paid to how lack of choice in assuming the role affects quality of life (QOL) among FCs of adults with cancer. Understanding choice could guide interventions protecting this invaluable, often invisible workforce. Aims (1) Synthesize what is known about perceived choice among informal caregivers of adults with serious illness; (2) assess relationships between caregiving choice and caregiver QOL, burden, sleep, depression, stress, and social determinants of health; (3) describe experiences of FCs of adults with cancer providing care with no, little, or some choice. Design …

Experimental Evaluation Of Membranes In The Recovery Of Hydrogen From Serpentinization, Rafael Dos Santos

LSU Master's Theses

Natural hydrogen generated through serpentinization reactions has emerged as a promising low-carbon energy resource. However, serpentinization-derived gas streams commonly contain methane (CH₄) and carbon dioxide (CO₂), requiring purification before hydrogen can be utilized in industrial applications. Membrane-based gas separation technologies offer a potentially cost-effective solution for hydrogen recovery; however, to the best of the author's knowledge, no previous studies have specifically investigated their application to serpentinization-derived gas streams.

This work evaluates the performance of two commercial polymeric membrane modules (Evonik and Generon) and one palladium-copper (Pd-Cu) membrane module (Okaya) for hydrogen recovery from gas compositions representative of serpentinization environments. An …

A Retrospective Analysis Of Structured And Semi-Structured Training Program Design For Law Enforcement Recruits, Ian Bonder

Doctorate in Kinesiology

Law enforcement recruits typically complete law enforcement agency (LEA) academy training before assuming sworn-in duty. Tactical strength and conditioning facilitators (TSAC-F) may need to modify program design based on their unique circumstances. The purpose of this study was to determine the effects of different training program designs in five state-mandated tests (vertical jump [VJ], 1-minute sit-ups and push-ups, 300-meter [300m] sprint, and 2.4-kilometer [2.4km] run) among LEA recruits at a Midwest LEA training academy. De-identified data for 26 LEA recruits (Periodized/Structured Group [PSG; n = 7]) and (Semi-structured Group [SSG; n = 19]) were retrospectively analyzed. Repeated measures ANOVA assessed …

Metropolitan Public School Counselors’ Perceptions On Implementing The Ohio K–3 Social And Emotional Learning Standards, Sharon Johnson

Walden Dissertations and Doctoral Studies

In 2019, the Ohio Department of Education adopted K–12 Social and Emotional Learning (SEL) standards to support students’ emotional, behavioral, and academic development; however, the problem is that implementation remains optional across districts, resulting in variability in school counselors’ access and consistency. Although SEL implementation has been examined in educational settings, there is a gap due to a lack of available research that have explored metropolitan K-3 public school counselors’ lived experiences implementing the Ohio K-3 SEL standards. The purpose of this transcendental phenomenological study was to explore metropolitan K-3 public school counselors lived experiences implementing the Ohio K-3 SEL …

Relationship Between Internet Use, Perceived Social Support, And Obesity Among African American Young Adults, Marketta Mccollough

Walden Dissertations and Doctoral Studies

The disproportionately high prevalence of obesity among African American young adults is a significant public health crisis rooted in systemic inequities. The purpose of this quantitative cross-sectional study was to examine the relationships between internet use for health information, perceived social support (online and offline), and obesity in this population. Grounded in the social cognitive theory (SCT), this study investigated how these behavioral and environmental factors interact to influence body mass index. Using secondary data from the 2021–2023 National Health and Nutrition Examination Survey, a complex samples logistic regression with a Bonferroni correction (α = .0125) was conducted on an …

Proposal For A Comprehensive Workplace Violence Program In An Acute Care Facility, Christin V. Timmons

Walden Dissertations and Doctoral Studies

Workplace violence (WPV) in healthcare is a growing threat to caregiver safety, workforce stability, and patient outcomes. At a newly opened acute care facility, the absence of a comprehensive WPV prevention program posed a gap in practice, creating safety risks and regulatory vulnerability. A literature search was conducted using CINAHL, PubMed/ MEDLINE, ProQuest Nursing & Allied Health collection, and Google Scholar. A total of 50 articles were identified with 11 articles meeting all inclusion criteria. Collectively, findings supported comprehensive, multicomponent WPV prevention programs to integrate leadership engagement, structured governance, staff education, environmental controls, and continuous data monitoring to improve safety …

The Relative Strength Of Social Media Motives, Perceived Race Relations, And The Centrality Of Black Identity In Predicting Black Community Activism, Johnnie Gordon

Walden Dissertations and Doctoral Studies

As social media has become a central context for identity development, sociopolitical awareness, and civic engagement among Black emerging adults, exposure to racialized content, experiences of online discrimination, and competing narratives regarding racial progress may heighten awareness of systemic inequities and strengthen collective racial identity. To date, the potential of these experiences to motivate engagement in Black community activism to advocate for community empowerment has not been investigated. Informed by social identity theory, this quantitative study assessed the relative importance of motives for social media use, perceived racial progress, and Black identity centrality in predicting Black community activism among emerging …

Ai Vs. Licensed Psychologists: A Comparative Analysis Of Treatment Plan Quality For Treating Psychological Distress, Michael Edward Maloney

Walden Dissertations and Doctoral Studies

The study was conducted to investigate whether statistically significant differences exist in the quality of treatment plans developed by artificial intelligence (AI) platforms versus treatment plans generated by licensed psychologists, with a focus on intervention specificity and clinical appropriateness. Given the rapid proliferation of digital mental health technologies and the persistent shortage of licensed mental health professionals, empirical evaluation of AI-driven clinical tools has become a critical area of inquiry. Grounded in dual process theory (DPT), which conceptualizes decision making as the product of both intuitive and analytical cognitive systems, the study employed a quantitative, between-groups design. Sixty-six licensed psychologists …

The Intervention Design Specialist Program As A Tier Iii Support In Elementary Schools: An Explanatory Case Study, Kevin G. Spaulding

Graduate Dissertations and Theses

This explanatory qualitative case study explored how the Intervention Design Specialist (IDS) program functions as a Tier III behavioral intervention within the Multi-Tiered System of Supports (MTSS) framework in elementary schools in Francis County Public Schools. Grounded in Social Cognitive Theory, the study examined stakeholders’ perceptions of the program’s purpose, implementation, influence on students with intensive behavioral needs, impact on classroom and school climate, and the factors that supported or challenged successful implementation. Data were collected through semi-structured interviews, observations of classroom interventions and team meetings, and review of program records. Data were analyzed using an inductive, iterative coding process …

Drifting Neurons, Stable Geometry: Population Representations Of Instrumental Behavior In The Dorsomedial Striatum, Arati Sharma

Dartmouth College Ph.D Dissertations

The brain reliably supports learned behaviors over long periods of time despite continual biological changes that alter the activity of individual neurons, and the connections between them. For learned behaviors to persist, the information stored in neural populations must remain accessible even when the activity of individual neurons changes. Understanding how the brain achieves this is a fundamental challenge in neuroscience. The dorsomedial striatum (DMS) is critical for instrumental behavior, encoding information about actions, outcomes, and their relationships. Although extensive work has characterized the role of the DMS during learning and performance, less is known about how task-related information is …

A Charcoal Analysis At The Jupiter Inlet 2 (8pb35) Site In Jupiter, Florida, Christopher Rubido

Electronic Theses and Dissertations

This project utilizes five sediment core samples from the Jupiter Inlet Lighthouse archaeological (8PB35) site in northern Palm Beach County, Florida (four core samples derived from areas where cultural material has been found and one core from a nonanthropogenic area). These sediment core samples were analyzed using a variation of a tested charcoal analysis methodology often used with lake and peat bog cores, but in this case, the cores come from an upland coastal environment. The findings of this project have shown efficacy of the modified methodology for locating charcoal peaks in habitation zones found in core strata and as …