Digital Commons Network^™

Deep Learning Vision-Based Bridge Inspection With Resource-Constrained Unmanned Aircraft Systems, Ji Young Lee

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Bridge inspection is critical for ensuring structural integrity, extending the service life of infrastructure, and minimizing maintenance costs. As bridges age and endure increasing loads, regular inspections help detect early signs of wear, such as cracks or corrosion, that could impact safety and performance. However, traditional inspection methods are labor-intensive, requiring significant time, specialized equipment, and manual access to challenging areas, which can lead to costly disruptions. Additionally, reliance on human inspectors introduces subjectivity, with assessments varying by individual expertise. These factors highlight the inefficiencies and safety risks in current inspection practices, underscoring the need for more objective, efficient solutions. …

Take-Two Interactive Software, Inc Strategic Audit, Carter Herchenbach

Honors Program: Senior Projects (Public)

Abstract:

This case study focuses on Take-Two Interactive, Inc (TTWO). Take-Two is a video game developer and publisher most well known for their 2K Sports and Grand Theft Auto video games. By focusing on issues critical to strategic management, this paper provides a detailed analysis of Take-Two Interactive and its subsidiaries. To accomplish this, the paper uses different analysis to examine how, where, and what actions Take-Two uses to compete in the video game industry. The analysis implemented to accomplish this includes a PESTEL analysis, Porter’s Five Forces analysis, and an analysis of Take-Two’s senior leadership team and corporate strategy. …

Volunteering For Medically Underserved Children: Clinic With A Heart–Back-To-School Clinics, Isabella Marie Kerby Kessinger

Honors Program: Senior Projects (Public)

Medically underserved children, often from low-income families or areas with limited healthcare resources, face significant barriers in accessing essential medical services and represent a fundamental challenge to equity and social justice. School physicals and back-to-school clinics play a crucial role in addressing these healthcare needs, serving as a gateway to educational and extracurricular opportunities.

Clinic With a Heart (CWH), a non-profit medical and dental clinic in Lincoln, Nebraska, serves as a model for addressing healthcare disparities. In 2023, CWH provided 3,109 visits to 1,846 unique patients, with 83% lacking health insurance and 63% having household incomes below $16,000 annually. The …

Examining Factors Of Variance In Energy Metabolism Of Dairy Cattle, Addison Lee Carroll

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Variation is thought to occur in the use of dietary energy for production in dairy cattle. First, variance can be observed when new methane mitigation strategies are fed resulting in increased H₂ output potentially resulting in downstream effects on estimates heat production via the Brouwer (1965) equation. Therefore, in chapter 3 a review was created to systematically describe the mathematics and theory behind the Brouwer equation, and rederive a heat production equation to integrate H₂ production. Results indicate heat production using the classical Brouwer equation (1965) relative to the rederived equation resulted in an overestimation of heat production …

Microbiome Variation In Production Phenotypes And The Role Of Colonization History In Microbiome Establishment, Seidu Adams

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Ruminant-based agriculture is expected to continue to be a major contributor to food security to feed the growing population. At the heart of nutrient degradation of complex organic matter within the rumen are its microbes. These microbes can convert otherwise unusable organic matter into usable protein and energy and can provide up to 50% of the animal’s protein needs and up to 70% of the energy needs. The microbial functional capacity within the rumen determines the nutrients utilized and the end products of fermentation. However, our understanding of microbial functional capacity within the rumen and factors that influence the rumen …

Domain-Specific Machine Learning Approaches For Geospatial Problems, Shine Bedi

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation explores novel algorithms for complex geospatial problems at the intersection of environmental, social, and computational sciences. Emphasizing the unique challenges of the geospatial domain, particularly the deviation from the independent and identical distribution (IID) assumption, the research spans various methodologies across different domains, demonstrating the benefits of specialized approaches in spatial analysis.

First, we show that machine learning techniques can be effectively used in environmental modeling, which often has severe class imbalance challenges. Using artificial neural networks (ANN), support vector machines (SVM), and extreme gradient boosting (XGB) and techniques to address class imbalance provides insights into groundwater quality …

Mining Work Items To Streamline Software Maintenance Tasks, Salomé Perez-Rosero

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Software engineering maintenance tasks often require associating code changes into groupings of related units of work to have as much information as possible about the developments toward addressing a specific code task. A comprehensive understanding of how a code task has evolved helps developers make better decisions about changes in the overall codebase, where a commit represents the set of code changes made to the codebase at a specific time. While the concept of work items as logically related code changes has been primarily theoretical, its impact on software maintenance tasks, such as tracing the origins of bugs or fixes …

Leaders’ Experiences Of An Organizational Journey To Inclusive Leadership, John Allan Slieter

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

The purpose of this qualitative phenomenological study was to explore the lived experiences of fourteen leaders of a large community healthcare organization while they undertook adoption of an initiative intended to create a more inclusive culture in their organization. Utilizing a Transcendental Phenomenological approach to data collection and analysis, data generation occurred through semi- structured interviews. Analysis of data provided descriptions of the sense making that explains how these leaders experienced the phenomenon contextually. Four themes emerged from this study, (a) Our mission is to serve, (b) Who is at the table? (c) Securing our future, and (d) …

Nitrogen Limitation In Soybean: Physiology And Diagnosis, Luzviminda Ann Ramos Sazon

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

In high-yield soybean environments, the seed yield is limited by nitrogen (N) supply. However, the response of soybean to N fertilizer application is inconsistent. Understanding the seasonal N uptake dynamics in soybean can provide insights on diagnosing N limitation if soybean. To understand soybean N dynamics, we assessed seasonal trends on dry matter and N accumulation in vegetative organs (leaves, stems, and petioles) from 42 field experiments. Each experiment included a ‘zero-N’ treatment, where crops relied on N supply from soil and biological N fixation (BNF), and a ‘full-N’ that received ample N via N fertilizer addition. Vegetative storage proteins …

Exploring Mindfulness Within Leadership Development: A Phenomenological Study, Amardeep Kaur

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Leadership is a key to success in a complex, rapidly changing world. While scholarly and organizational interest in mindfulness is growing within the leadership and leadership development space, it remains largely unexplored from the leader's perspective. This phenomenological study explored how leaders perceived and described their mindfulness experiences within their leadership development. This exploratory research used a transcendental phenomenological approach (Moustakas, 1994) to capture their self-expression through in-depth, semi-structured interviews. Day's (2000) conceptual framework on leader and leadership development guided the study. The participants were recruited from organizations based in the U.S. that offer mindfulness-based programs, snowball sampling techniques, and …

Motivated By Hope: Why We Strive For The Improbable, Varkey K. Titus Jr.

Department of Philosophy: Dissertations, Theses, and Student Research

Some of the most rewarding actions we take in life are difficult. The outcomes of these actions are surrounded by uncertainty, and what relevant data is available indicates a high probability of failure. Current philosophical work proposes that hope can resolve the puzzle of how people can rationally choose to engage in difficult actions, but this work constrains hope’s motivational role to actions whose successful outcomes reside within the realm of an individual’s own agency. I expand the explanatory role of hope motivating action to include cases whose outcomes depend on some combination of factors internal and external to the …

Cognitive Interviewing Within A Mixed Methods Practice: Utilization And Methodological Exploration Of Cognitive Interviewing, Jack Riley Hebner

College of Education and Human Sciences: Dissertations, Theses, and Student Research

Cognitive interviewing (CI) is a memory-enhancing technique used to extract more valid data from participants by addressing cognitive needs. Present research applied CI to program evaluation, theorizing that more quality data would be retrieved, especially when utilizing a mixed methods approach. The program chosen to further explore this technique and provide potentially invaluable evaluation data was the Educational Psychology Department at the University of Nebraska-Lincoln (EDPS). The sample consisted of 32 individuals, consisting of graduate students and faculty across all programs.

The overall evaluation focused on inter-program and inner program understanding which is operationalized as the ability to relay how …

Understanding And Intervening In Children's Tick Risk Perceptions And Protective Behaviors: A Grounded Theory, Ariel Dawdy

Department of Entomology: Dissertations, Theses, and Student Research

Children, ages 8 years and younger, are at a particularly high risk of contracting a tick-borne disease. This is partially due to the misconceptions spread about tick protective behavior and a poor understanding of how antibiotic treatment can help. Because most communities and families believe that tick control is the individual’s responsibility, looking at the interaction between ticks and human children is essential to understanding the individual’s motivations to protect themselves. To help alleviate the number of individuals contracting tick-borne diseases, misconceptions must be addressed, intervention programs implemented, and a behavioral change must occur. This study used a qualitative research …

Morality, Outgroups, And Politics, John Jostes

Department of Political Science: Dissertations, Theses, and Student Research

Moral differences between Democrats and Republicans contribute to affective polarization, or how negatively each side feels toward one another. Partisans are also generally aware of and sensitive to which social groups comprise the other political party. The present study examines if changes to the United States population, and thus levels of support for the two parties, will influence affective polarization. To do so, participants were randomly assigned to one of two treatment conditions in which they read about demographic changes reported in the 2020 U.S. Census, or a control condition. I find that the treatment conditions did not have a …

Soybean Cyst Nematode (Heterodera Glycines Ichinohe) Virulence Assay Against Resistance Sources In Nebraska, Pratibha Karki

Department of Plant Pathology: Dissertations, Theses, and Student Research

Soybean cyst nematode (SCN, Heterodera glycines Ichinohe), one of the major yield-limiting pathogens of soybean, is currently found in 60 counties of Nebraska that produce more than 90% of the state’s soybean. Often, yield loss occurs without any above-ground symptoms, which makes it difficult to manage. The primary management option is the use of SCN-resistant varieties. Several soybean plant introductions serve as resistance sources against SCN. Unfortunately, the single source, PI 88788, is used in approximately 90% of resistant varieties and its prolonged use has increased the virulence status of SCN in the U.S. A study was conducted to assess …

“Kematz'ib' Para Gritar” Innovative Technologies In Revitalizing The Mayan Languages: Empowering Youth Through Poetry - A Narrative Study, Héctor De Jesús Palala Martínez

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation explores innovative approaches to preserving and revitalizing the linguistic and cultural heritage of Mayan-speaking youth of Guatemalan descent in rural Nebraska. It delves into the intersection of technology, artistic expression, and cultural practices, emphasizing the revitalization of Mayan languages in Abya Yala (the Americas), particularly emphasizing the Guatemalan and the Mayan diasporas in Nebraska.

The research investigates the roles of digital humanities, culture-based education, and poetic expressions in language preservation/revitalization efforts among Mayan youth and unaccompanied minors in transnational educational settings. Central to the study is an academic initiative for transnational Mayan high school students integrating poetry and …

The Use Of Two-Dimensional Detectors For Snapshot And High Accuracy Imaging Ellipsometry, Jeremy A. Vanderslice

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Ellipsometry is a powerful and sensitive optical technique used to characterize thin film thickness and optical properties by measuring changes in the polarization state of light upon reflection or transmission. This dissertation investigates novel ellipsometry configurations that use two-dimensional detectors to enhance measurement speed, spatial resolution, or accuracy of ellipsometry measurements. The study involves the development of three different ellipsometry configurations, encompassing mechanical prototypes, mathematical models, and test measurements to evaluate each system.

Advisor: Jeffrey Shield

Channel Estimation In Millimeter Wave Mimo Systems: The Tensor-Based Methods, Fei He

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation presents two novel tensor-based methods for solving channel estimation (CE) problems in Millimeter Wave (mmWave) multiple-input multiple-output (MIMO) wireless communication systems. First, we proposed a method of tensor rank regularization with bias compensation for CE in a hybrid mmWave MIMO system. We modified the CANDECOMP/PARAFAC(CP) decomposition-based method and jointly estimated the tensor rank and channel factor matrices. It differs from most existing works by assuming that the number of channel paths is unknown, yet it can accurately estimate channel parameters without prior knowledge of the number of multipath components. The tensor rank is estimated by a novel sparsity-promoting …

Analysis Of Impulsive Differential Equation Models Of Cell Populations Undergoing Radiation Therapy, Abigail D'Ovidio Long

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Radiation therapy is a mode of treatment which is implemented for approximately 50% of cancer patients. Treatment needs to be able to kill cancer cells, but also do minimal damage to surrounding healthy tissue. We propose two main impulsive differential equation models of radiation therapy to capture the periodic nature of the treatment. These models build off of previous studies using clinical data to ensure biological relevance. The first model incorporates only cancer cell populations, and we provide parameter relationships which theoretically ensure treatment outcomes of cancer eradication, cancer approaching a carrying capacity, and cancer approaching a periodic solution. We …

Chronic Absenteeism: The Journey Toward Improved Attendance And Achievement In A Rural Elementary School, Charla S. Brant

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This study examined a school’s improvement efforts to reduce chronic absenteeism in a rural, high-poverty elementary school. Through improvement science, it analyzed the effects of attendance interventions on attendance improvement. It is well known that students who do not regularly attend school will also struggle with adequate progress and growth in multiple subject areas. This study aimed to use Multi- Tiered Systems of Support (MTSS) to conduct specific attendance-based interventions and then evaluate their effectiveness in one rural high-poverty elementary school. It also analyzed the effect of attendance on literacy achievement measured by Acadience data. How can an elementary school …

Taking A Closer Look At Tpack: Examining Teacher Perspectives Of The Knowledge, Competencies, And Context Needed For Improved Remote Education In Grades 4-8, Jennifer Christine Buth Bell

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Though wrought with challenges, the COVID-19 Pandemic, which led to the closure of schools worldwide and forced educators into a rapid transition from traditional to Emergency Remote Teaching (ERT), held some promise for furthering the integration of digital technology in schools. But now, years following the crisis, policymakers, administrators, and teachers continue to grapple with how best to incorporate lessons learned and improve the future of teaching and learning in both traditional and remote settings. This mixed-methods study (n = 21; n = 6) followed an explanatory sequential design to collect and analyze data from a sample of 4th-8th …

Local Rural Knowledge And Early Childhood Informal Science Education In Rural Nebraska, Sarah Michelle Paulos

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This study aims to discover the existing experiences that lead to local rural knowledge (LRK) of specific rural Northeast Nebraska communities. This information will assist in understanding the impact that LRK has on young children’s science knowledge in rural communities. By engaging in hands-on experiences and interactions, science learning goals for children may be achieved and developed through science outreach programs. During Phase 1 of this study, adults in the selected rural communities participated in an online survey indicating their knowledge of various common rural phrases with the option to share personal stories of experiences and family history. This information …

A Search For Self Through Allyship And Advocacy ‘About, With, And As’ Multilingual Learners: An Autoethnographic Study, Molly Heeren

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This autoethnographic study uses personal memoirs to explore the author’s allyship and advocacy efforts throughout the past 24 years in the language teaching profession. Through the process of self-reflexivity and introspection, “turning points” are investigated to understand more about what influences the actions and behaviors of allyship or advocacy ‘about, with, and as’ multilingual learners. As a district level instructional coach and teacher of multilingual learners in both elementary and adult settings, the author’s revelations in teaching identity, influences of Empire, misalignment of the ‘sense of language,’ and legitimate peripheral participation in communities of practice become salient issues. The dynamics …

Characterization Of The Final Enzyme In The Coenzyme M Biosynthesis Pathway In Methanosarcina, Connor John Hines

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Methanogenesis is known to be one of the oldest forms of energy generation on our planet. Methanogens rely on this method of energy conservation and have evolved to metabolize a variety of substrates, including the waste products of other organisms. This feature has made methanogens beneficial to both wastewater treatment and landfill-to-energy projects. Methane itself is a greenhouse gas twenty times more potent than carbon dioxide, viewed as a particularly influential contributor to global greenhouse emissions. Climate change was known to be on the horizon throughout the 20^th century but has made itself known vocally during this 21^{st …}

When Language Policy And Planning Is A Missed Opportunity: Lessons Learned From A Proposed But Not Implemented Dual Language Bilingual Education Program, Jessica Mitchell-Mccollough

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

When populations undergo demographic shift, as in Nebraska in recent decades, educational practices can establish or reinforce hegemonic practices through denial or legitimization of language, culture, and identity, or they can be counterhegemonic. The demographic changes in Nebraska have been defined by a growth in Latinx populations (Morales, et al., in press). As a result, there have been various efforts to explore dynamic shifts in educational programs offered to support students’ unique language acquisition needs, including growth in dual language bilingual education (DLBE). However, not all communities have responded uniformly. During a recent strategic planning process Lincoln Public Schools (LPS) …

The Impact Of Tier 1 Pbis Implementation Fidelity On Education Outcomes For Students With Attention-Deficit/Hyperactivity Disorder, Rebecca Anne (Wright) Overfield

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation study aimed to examine the relationship between Tier 1 Positive Behavioral Intervention and Supports (PBIS) implementation fidelity and the academic (e.g., MAP Growth scores) and behavioral outcomes (e.g., major office discipline referrals, suspensions). High quality PBIS implementation fidelity has been linked with improved standardized test scores and decreased instances of major office discipline referrals, in-school suspensions, and out-of-school suspensions for students with and without behavioral difficulties. However, no research has been done on the impact of PBIS implementation fidelity on students with ADHD. It is estimated that at least 40% of students with ADHD require at least one …

Investigating The Impact Of An Elaborative Conversation Strategies (Ecs) Intervention On Parent-Child Interactions And Preschool Children's Science Learning Using A Single-Case Experimental Design, Yao Yao

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

The primary purpose of this study was to examine the efficacy of the elaborative conversation strategies (ECS) intervention in improving the quality of parents' science talk during everyday home learning interactions using a single-case experimental design. Specifically, the study explored whether training parents in ECS could increase their use of these high-quality conversation strategies and enhance the quality of their science talk when engaging their children in science activities. The study also investigated how the ECS intervention impacted children's science knowledge, skills, and interest, as well as parents' attitudes toward supporting their children's science learning.

Participants included five typically developing …

Variable Selection In Distance Metric Learning And Triplet Constraints For Deep Learning Based Ordinal Classification, James D. Clothier

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

The purpose of this research is to augment linear and kernelized ordinal distance metric learning (L/KODML) techniques with a proposed variable selection methodology that integrates the Sequential Multi-Response Feature Selection (SMuRFS) algorithm. Additionally, we aim to embed ordinal triplet constraints into a deep learning architecture, and to propose a general framework for deep learning-based ordinal classification. A variety of simulation studies and real data experiments were conducted to evaluate the various methodologies. For the distance metric learning and variable selection, results showed that the integration of SMuRFS performed effective variable selection and improved prediction accuracy. For the triplet constraints, incorporating …

Novel Mouse Models To Study The Role Of T Cells In Cardiac Autoimmunity, Meghna Sur

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Myocarditis patients can chronically develop dilated cardiomyopathy and autoreactive T cells could contribute to the disease pathogenesis, but defining their antigen specificity remains a major challenge. To fill this gap, we generated T cell receptor (TCR) transgenic (Tg) mice specific to cardiac myosin heavy chain (Myhc)-α 334–352 and made a few observations. First, we unexpectedly noted both CD4 and CD8 T cells expressing TCRs specific to Myhc-α 334–352. Second, while Tg T cells from myocarditis-resistant C57BL/6J mice did not respond to Myhc-α 334–352, those from immunized mice responded, indicating that in vivo priming is necessary to break tolerance. Third, upon …

Performance Of Acoustic Telemetry And Space Use Of Pallid Sturgeon In The Lower Platte River, Nebraska, Christopher F. Pullano

School of Natural Resources: Dissertations, Theses, and Student Research

Pallid Sturgeon (Scaphirhynchus albus) are centenarian, potamodromous, rheophiles that historically occupied the Missouri River and Mississippi River basins. Listed on the U.S. Endangered Species Act in 1990, population declines are attributed to habitat fragmentation and degradation, as well as overharvest, and hybridization. A knowledge gap exists regarding the extent to which tributaries facilitate key life stages for Pallid Sturgeon. This study evaluated the capacity of acoustic telemetry to monitor the movements of Pallid Sturgeon in a shallow, braided tributary to the Missouri River. The specific objectives were to (1) evaluate the environmental variables influencing the performance of acoustic …