Digital Commons Network^™

Transformative Leadership In Action: A Narrative Study Of Principals’ Influence On Students’ Achievement, Staci Taylor Fullmighter

Electronic Theses and Dissertations

This narrative inquiry examined how principals in low-performing high-minority urban schools use transformational leadership to improve academic outcomes. The purpose of this research was to describe principals’ leadership behaviors that are perceived to positively influence academic achievement among students who identify as minority and low socioeconomic status and are attending or have attended urban school districts with high concentrations of the identified population. Data were collected through semistructured interviews with principals, and narratives were studied to identify trends across their experiences. Four themes emerged: (a) trust and shared accountability, (b) encouraging creativity and risk-taking, (c) communicating shared goals, and (d) …

How Can Learning Management Systems Positively Impact Student Engagement In Online Courses?, Jerald P. Wilson

Electronic Theses and Dissertations

The topic of this dissertation is learning management systems, specifically Canvas. Research has proven that student engagement is a strong factor in student achievement in both online and inperson courses. The COVID-19 pandemic highlighted a deficit in instructors’ ability to acquire and maintain student engagement in online courses. This study details why this problem exists and how instructors have successfully addressed it in higher-level online courses. The primary purpose of this qualitative descriptive study was to examine how learning management systems, specifically Canvas, can increase student engagement in online courses in higher education. Qualitative research was the chosen paradigm for …

Rooted Or Restless: Retaining Teachers From Urban And Suburban Backgrounds In Rural Texas, Martha Saucedo Ms.

Electronic Theses and Dissertations

Rural school districts across the United States continue to experience persistent challenges in retaining teachers, particularly those from urban and suburban backgrounds who transition into geographically isolated rural communities. These educators often encounter professional isolation, cultural adjustment, and limited access to resources, which influence their long-term commitment to rural schools. The purpose of this qualitative case study was to explore how teachers from urban and suburban backgrounds experienced geographical and professional isolation in rural schools within a Texas Education Service Center region in a rural area and how leadership practices influenced their sense of belonging, place attachment, and retention. This …

Implementing Hypertension Guidelines Into Clinical Practice, Misti Michele Mays

Electronic Theses and Dissertations

Hypertension is a complex chronic disease process, and it is essential to educate the patient on the disease process, as well as on all aspects of self-management. It is essential that providers choose an evidence-based guideline by which they will manage their hypertensive patients. In addition, providers must schedule regular follow-up appointments with their patients, along with a wide variety of other multifactorial components in regard to the management of patients diagnosed with hypertension. In addition, providers have a responsibility to stay informed on new approaches to blood pressure management by reviewing the professional literature on a regular basis. Much …

Reducing Humpty Dumpty Syndrome In Pediatric Inpatients, Jeanene Burns

Electronic Theses and Dissertations

The Doctor of Nursing Practice project examined pediatric inpatient falls. The healthcare agency involved in the project identified concerns regarding pediatric inpatient falls. Data were collected on pediatric inpatient falls that occurred on two nursing units at this agency based on the Generalized Risk Assessment for Pediatric Inpatient Falls and the Humpty Dumpty Falls Prevention Scale. Results from the project indicated marginal statistical significance, with approximately a 60% reduction in falls after the implementation of the Humpty Dumpty Falls Prevention Scale. A recommendation for future research is a comparison of the two pediatric fall risk assessment tools after the Humpty …

Addressing The Problems Of Data Variations, Quality, And Scarcity In Training Deep Neural Networks, Jian Sun

Electronic Theses and Dissertations

The performance of deep neural networks (DNNs) is strongly influenced by the characteristics and quality of the underlying datasets. This Ph.D. dissertation addresses three pervasive data challenges-imbalance, quality degradation, and scarcity-that commonly hinder the effectiveness of DNNs in computer vision (CV) and natural language processing (NLP) applications.

Class imbalance remains one of the most frequent causes of degraded model generalization. While Focal Loss effectively mitigates inter-class imbalance by assigning higher weights to minority classes, it struggles with intra-class imbalance, particularly in video datasets where longer clips dominate feature representation. To address this, I implement and utilize …

Exploring The Lived Experiences Of Black Women In Undergraduate Stem Core Expansion Pathways, Lizzie L. Evans Martinez Alvarez

Electronic Theses and Dissertations

The use of social incongruence in the film Hidden Figures, which juxtaposed with STEM education as the most powerful in contrast with Black women as the least powerful, supported the argument for the specific problem of practice to examine the unmet need for socially and ethnically diverse student populations in U.S. STEM higher education and careers. The purpose of this hermeneutic phenomenological research study was to identify and analyze the lived experiences of Black women regarding barriers they perceive in the STEM educational and career decision-making processes, while exploring transformational pathways to STEM academic success. The study specifically analyzed …

Exploring The Personal Management Interview Program As A Burnout Prevention Strategy In Policing: A Qualitative Case Study, Lance C. Arnold

Electronic Theses and Dissertations

Police officers in the United States experience severe burnout at rates exceeding other service professions, with approximately 75% experiencing burnout symptoms. Current interventions predominantly focus on individual coping mechanisms rather than addressing organizational and leadership factors contributing to burnout. This qualitative single-case study explored the perceptions and experiences of police leaders and officers concerning the utility of a personal management interview program to foster positive leadership behaviors as a resource-oriented preventive strategy against burnout in a midsize municipal police department in Texas. The study employed semistructured virtual interviews with eight participants: four police leaders and four police officers who had …

A Narrative Study On The Resilience Of Women In Technology Careers, Gina J. Baldridge

Electronic Theses and Dissertations

In spite of the promotion of science, technology, engineering, and mathematics (STEM) education and careers, there is a lack of women entering the STEM workforce and majoring in STEM subjects. Women can experience gender bias and workplace marginalization in STEM careers, but have learned coping strategies that have contributed to their technology career resilience. The purpose of this narrative qualitative study was to explore how women working as individual performers and leaders in technology companies told their career stories of resilience through the perspective of change acceptance, confidence, and communication, three factors in Kumar’s CR8 model of resilience. The model …

Intersecting Identities: The Leadership Journeys And Challenges Of Black Women Senior Leaders In Southern U.S. Predominantly White Institutions, Quizanae' Yvonne Cooper

Electronic Theses and Dissertations

This study looked at what Black women in high‑level leadership roles are experiencing at predominantly White institutions in Texas and Florida now that diversity, equity, and inclusion (DEI) policies have been rolled back. Using Black feminist theory and intersectionality as the foundation, the research focused on how race and gender shape their leadership, their decision‑making, and the ways they navigate their careers. Through in‑depth interviews with 10 Black women in executive positions, the study uses a narrative approach to understand their stories. Eight major themes emerged, and many participants explained that losing DEI initiatives created new obstacles, reduced support systems, …

Work Environments Matter: The Impacts Of Interpersonal Relationships On Student Affairs Professionals, Lawrence R. Daniel

Electronic Theses and Dissertations

This qualitative study examined how everyday workplace relationships influence engagement, professional identity, and retention among student affairs professionals in higher education. Guided by relational leadership theory, the study explored how leadership is experienced not only through formal position or authority, but also through relational presence, psychological safety, and advocacy. Seventeen student affairs professionals representing diverse institutional types, geographic regions, and career stages participated in in-depth semistructured interviews. Data were analyzed using reflexive thematic analysis and incorporated both in vivo and line-by-line coding to ensure that findings remained grounded in participants’ voices and lived experiences. Nine themes emerged from the analysis. …

Texas Secondary Spanish Teachers’ Perceptions Of Factors Influencing Instructional Self- Efficacy, Satisfaction, And Effectiveness, Tana Verlane Palafox

Electronic Theses and Dissertations

Ongoing shortages of certified world language teachers and declining enrollment in secondary language programs have intensified concerns about teacher burnout, professional isolation, and instructional quality. Research has indicated that collaboration, targeted professional development, and supportive leadership influence teachers’ instructional self-efficacy, job satisfaction, and instructional effectiveness. However, limited research has examined how secondary Spanish teachers in Texas experience these issues. This qualitative collective case study explored how Texas secondary school Spanish teachers perceive the impact of their professional experiences on instructional self-efficacy, job satisfaction, and instructional effectiveness. Grounded in Bandura’s social cognitive theory and Vygotsky’s social constructivism, the study examined how …

Longevity, Resilience, And Thriving Of Women In Ministry: A Case Study Of Women In Ministry From A United Pentecostal Holiness Church, Eunice Cheryl Feltus Little

Electronic Theses and Dissertations

Abstract

The problem of ministry attrition caused by burnout is well documented. Research attributes the impact of burnout on the resilience, longevity, and thriving of ministry workers to role-related stress and adversity. High attrition rates throughout religious organizations and a lag in longevity and resilience contribute to a shortage of ministry workers. Some ministry workers leave the vocation because of stress and burnout, yet others persevere. Despite the possible adverse effects, many men and women find a sense of well-being and joy in ministry work. This qualitative distributive case study focused on those who stayed in ministry and the strategies …

Patient Wait Time And Throughput Interventions In The Cardiology Outpatient Setting, Chioma Ohiri Tawose

Electronic Theses and Dissertations

Healthcare collaboration and patient care require effective communication. Poor communication impacts wait time. Inadequate communication in the outpatient cardiology clinic can lead to disruptive patient throughput, or workflow, and extend patient length of visit. The purpose of this project was to implement a means of communication for clinicians and healthcare assistants to improve patient flow and cut down idleness, ultimately reducing patient wait time. The project established the incorporation of a built-in electronic health record communication notification system, the Event Button, for asynchronous communication between staff. A quantitative quality improvement design was used to conduct this project. Inferential and descriptive …

A Taxonomy-Driven Modular Defense Against Non-Canonical Language In Vision-Language-Action Models, Viraj Samson

Electronic Theses and Dissertations

Vision-Language-Action (VLA) models have recently achieved strong performance across manipulation benchmarks, but these benchmarks rely on highly templated instructions on which the models are typically fine-tuned, leaving their behavior under realistic language-side perturbation unclear. It remains an open question whether the linguistic flexibility inherited from vision-language pretraining survives this fine-tuning, or whether the resulting policies become narrowly tuned to benchmark phrasing and brittle to the intent-preserving language variation that real users naturally produce. We address this gap with a systematic study of VLA robustness under non-canonical instructions, comprising three components: a structured taxonomy of intent-preserving variations spanning linguistic, orthographic, and …

Data-Driven Optimization Of Memory Effects And Critical Components In Cascading Failure Interaction Networks, Md Farhan Tanvir

Electronic Theses and Dissertations

Cascading failures are a major concern for modern power systems‚ where a small failure can cascade through the network to create a large blackout. Because such an event could have catastrophic economic and social costs it is important to understand cascading failures‚ how to model them‚ and the possibility of reducing them. In this thesis‚ we develop a data-driven framework based on actual utility outage data to model and reduce cascading failures. The proposed methodology is based on generation-dependent interaction models and in this study interaction matrices obtained from historical outage events are used to describe the interaction between generations. …

Computational Modeling Of Biophysical Transport: Respiratory Drug Delivery And Tissue-Level Physics, Md Tariqul Hossain

Electronic Theses and Dissertations

The nasopharynx, the upper part of the pharynx located at the back of the nose serves as a critical hotspot for initial respiratory infections via inhaled transmission, largely due to the presence of specific surface receptors that pathogens can exploit for cell invasion, combined with a relatively sparse local mucociliary substrate. To enhance the therapeutic efficacy against certain pathogens, such as the SARS and Influenza viruses, it is therefore essential to improve the targeted delivery of drugs to the nasopharynx. This study explores the use of intranasal sprays as a method for drug administration and models the transport of sprayed …

Numerical Investigation Of Injector Location And Equivalence Ratio In A Flame‐Holder Cavity Scramjet, Matthew Sorenson

Electronic Theses and Dissertations

This thesis presents a CFD-based parametric study of injector location and fuel rate in an ethylene-fueled flame-holder cavity scramjet using STAR-CCM+. Simulations are performed for three injector locations (x/D = 18, 36, and 54) and nine equivalence ratios spanning from ϕ = 0.2 to 1.0 in 0.1 increments. The study aims to determine how injector placement and fueling level alter scramjet performance across a broad operating sweep. The results show a clear regime change between ϕ = 0.2 and ϕ ≥ 0.3. At ϕ = 0.2, combustor behavior is weakly sensitive to injector location compared to the higher-fueling cases. For …

Cyber Security Related To Agricultural Data Encryption Using Edge Computing Devices, Mohammad Ashik Alahe

Electronic Theses and Dissertations

Smart Agriculture increasingly relies on image-based sensing, edge computing, and artificial intelligence to support data-driven decision-making in modern farming systems. While these technologies improve productivity and resource efficiency, they also introduce significant cybersecurity risks, particularly agricultural images transmitted and processed in real-time on resource-constrained edge devices. Unauthorized access, data manipulation, and interception of image data can lead to incorrect agronomic decisions and severe economic consequences. Despite this risk, efficient and practical cybersecurity solutions for real-time agricultural imaging remain limited. This study addresses these challenges by developing and evaluating encryption-based cybersecurity frameworks tailored for real-time agricultural image protection on edge computing …

Floodwater Salinity And Flood Duration Regulate Greenhouse Gas Production In High- Latitude Coastal Wetland And Tundra Soils, Mia J. Dicianna

Electronic Theses and Dissertations

Coastal high-latitude ecosystems are increasingly flooded from storm surges associated with climate change, exposing soils that were historically infrequently inundated to higher-salinity waters for longer durations. Sub-Arctic wetlands and tundra store large amounts of carbon, yet how flooding characteristics, particularly flood duration, influence microbial mineralization and, consequently, greenhouse gas (GHG) production in these soils remains poorly understood. We conducted a full-factorial microcosm incubation experiment in which coastal wetland and tundra soils were subjected to simulated flooding with three durations (1, 3, and 10 days) and four salinity treatments (unflooded, freshwater, 3 ppt, and 12 ppt) and measured carbon dioxide (CO2) …

Winter-Feeding High Forage Vs. High Concentrate Diets To Beef Cows: Effects On Placental Transcriptomics, Lactation Capacity, And Enteric Methane Emissions, Megan Ann Wehrbein

Electronic Theses and Dissertations

Nutritional management and lactation performance are critical factors influencing productivity in cattle. This research includes two complementary studies. The first study was a meta-analysis to develop a lactation curve for Bos taurus cattle in North America using data from machine or hand milked cows. Data from 7 studies were used resulting in 1340 cow-day observations. Milk yield was analyzed by parity (primiparous or multiparous) and feeding management (non-nutrient restricted or nutrient restricted), revealing that primiparous cattle peaked earlier and at lower yields than multiparous cattle, and nutrient restriction reduced peak milk yield. Overall, Bos taurus cattle followed lactation trends similar …

Evaluating Methodologies For Estimating Enteric Emissions And Modeling Greenfeed Technology Utilization In Extensive Beef And Bison Grazing Systems, Aletta Laura Husmann

Electronic Theses and Dissertations

Greenhouse gas (GHG) emissions from grazing ruminants represent a significant component of U.S. agricultural emissions. However, enteric methane (CH4) from cow– calf systems on extensive rangelands pose substantial measurement and management challenges. The Northern Great Plains (NGP) supports nearly one-quarter of the U.S. beef cow population, yet regionally representative, herd-level enteric emission data from commercial ranches remain limited. This thesis integrates empirical field measurements with modeling approaches to evaluate the feasibility of quantifying enteric emissions on extensive rangelands and to examine system-level drivers influencing data yield, costs, and operational performance. Enteric methane and carbon dioxide (CO2) emissions were measured from …

The Fate And Removal Of E. Coli Across Liquid And Sludge Treatment Stages In An Activated -Sludge Water Resource Recovery Facility, Shrawan Tandukar

Electronic Theses and Dissertations

This study evaluates the fate and removal efficiency of Escherichia coli (E. coli) across both liquid and sludge treatment processes at a full-scale activated sludge water resource recovery facility (WRRF) in Brookings, South Dakota. Understanding pathogen reduction within wastewater treatment systems is critical for protecting public health and ensuring regulatory compliance, particularly in facilities practicing water reuse and biosolids management. Liquid and sludge samples were collected from multiple treatment stages between January and July 2025 and analyzed using the IDEXX Colilert Quanti-Tray 2000 method. This study quantifies E. coli concentrations throughout the treatment train to assess removal performance and identify …

Production Of Fungal Biomass And Crude Chitin From Cheese Whey: Effects Of Whey Type And Lactose Hydrolysis On Aspergillus Niger And Trichoderma Reesei, Anye Catharine Nora Drum

Electronic Theses and Dissertations

Chitin is a biodegradable and biocompatible biopolymer with broad applications in the food, biomedical, pharmaceutical, and packaging industries. Conventional chitin production from crustacean shells is associated with seasonal availability, intensive chemical processing, and environmental concerns, creating interest in more sustainable alternatives. Filamentous fungi represent a promising source of chitin because of their rapid growth and ability to utilize low cost agro-industrial residues. This study evaluated the feasibility of producing fungal biomass and crude chitin from cheese whey through submerged fermentation while investigating the effects of whey type and enzymatic lactose hydrolysis on fungal growth, substrate utilization, and wastewater remediation. Aspergillus …

Task-Aligned Knowledge Transfer For Vision-Language Models Across Diverse Visual Challenges, Dongyoun Kim

Electronic Theses and Dissertations

Pretrained vision–language models (VLMs) encode broad visual and semantic knowledge, but this knowledge does not always translate into reliable performance on specialized visual tasks. Multi-object region understanding requires fine-grained relational alignment, scientific document question answering requires structured reasoning over tables and charts, and robotic manipulation requires task-relevant perception to influence action generation. This dissertation studies these gaps as a problem of knowledge utilization: helping a pretrained model use available knowledge in a form aligned with the target task. Its central claim is that effective adaptation depends not only on model scale, data volume, or full-backbone fine-tuning, but also on three …

Strip-Till Adoption For Soybean Production In Eastern South Dakota: Plant Development, Seed Quality, And Economic Analysis, Nicolas Passone

Electronic Theses and Dissertations

Soybean production in eastern South Dakota faces a persistent challenge: cool, wet spring conditions combined with heavy soils limit the adoption of conservation tillage despite its soil health and environmental benefits. Strip-tillage has been proposed as a middle-ground practice capable of providing conservation benefits while maintaining the seedbed quality advantages of conventional tillage. However, its performance in soybean production in South Dakota had not been evaluated prior to this work. This research examined the effects of tillage systems and fertilizer placement-timing, fertilizer rate, and seeding rate on soybean plant development, nutrient uptake, seed yield, chemical composition, and partial net economic …

Primary Avian Tracheal Cell Models For The Isolation Of Emerging Avian Metapneumovirus Strains, Tricia Serrao

Electronic Theses and Dissertations

The emergence of avian metapneumovirus (aMPV) subgroups A and B in the United States poultry industry has created an urgent need for standardized, host-specific diagnostic platforms. Historically, reliance on continuous, multi-species cell lines has limited the primary isolation of field strains and introduced potential adaptation artifacts. To address these challenges, this research first established and characterized a reproducible primary cell culture system derived from the tracheal tissues of 1-day-old turkey poults. This system was maintained in an optimized DMEM/F-12 formulation supplemented with 5% FBS, EGF, and ITS, with early-passage cultures achieving 90% confluence within 24 to 48 hours. Morphological and …

Imaging-Based Colorimetric Gas Sensing For Wearable Applications, Syed Saad Ahmed

Electronic Theses and Dissertations

Continuous monitoring of gases is a critical challenge for wearable health monitoring systems and portable environmental gas detection. The technology used for gas detection, including electrochemical sensors, metal oxide semiconductors, and non-dispersive infrared systems, is based on bulky optical components, which limit their practicality as an ideal tool for wearable and field-deployable stages. This thesis investigates if the passive colorimetric chemistry read-out provided by a low-power CMOS imager-based architecture can provide a non-invasive alternative across two different application domains: medical transcutaneous CO₂ monitoring systems and toxic gas detection from environmental. Two sensing platforms were developed and evaluated. In the first …

Towards Optimal And Resilient Ac/Dc Microgrids: Control Design, Analysis, And Implementation, Jun Zhang

Electronic Theses and Dissertations

Microgrids serve as a small-scale power grid for utilizing renewable energy to enhance energy reliability, sustainability, and resilience. As an autonomous system, an islanded microgrid can disconnect from the utility grid and operate independently by maintaining system voltage and frequency. However, this new feature introduces coordination problems among distributed generators (DGs), such as 1) how to make sure the voltage profile and current sharing in DC microgrid with different types of converters; 2) how to reduce the impact of cyberattack when the system coordination is performed based on communication, and 3) how to calculate the steady state under a droop …

A Study Of Lost Pla Investment Casting For A356 Aluminum In Resource Constrained Manufacturing Environments, Maverick Beckmann

Electronic Theses and Dissertations

Lost PLA investment casting offers a low tooling route for producing complex aluminum parts, but repeatability depends on material use, burnout behavior, geometric process limits, and dimensional response. This thesis evaluated Lost PLA casting as a resource efficient manufacturing method for complex A356 aluminum components in resource constrained settings through four linked objectives: metal reusability, burnout and PLA selection, process limitations, and feature based dimensional shrinkage. A metal mass balance was performed on six casting trials using salvaged A356. Ash residual behavior was studied through a single tray screening test of eight commercial filaments and three invested mold burnout trials …