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Design, Fabrication, & Laboratory Testing Of A Strain Gage Instrumentation System For Marine Applications, Salem C. Homrighausen

UNF Graduate Theses and Dissertations

A strain gage-based instrumentation system was designed and fabricated to measure the moment present at the base of a mock, diesel-engine snorkel for a submerged vehicle designed to operate in the surf zone. Afterwards, a lab experiment was designed and executed to determine the accuracy of the instrument and a 2-dimensional, matrix-vector equation was formulated to relate pairs of voltages, Vx and Vy, to moments, Mx and My for the experiment. Three versions of this model were built. The first model was created using traditional statics equations governing strain, stress, moment, force. The second and third models were built directly …

Fourier Transformation Of Non-Periodic Functions And Its Application In Computed Tomography, Sabrina Hossain

UNF Graduate Theses and Dissertations

Fourier analysis plays an important role in signal processing and imaging applications,

with computed tomography (CT) being a prominent example. CT imaging relies on recon-

structing cross-sectional images of objects from multiple projections, a process deeply rooted

in the mathematical framework of the Fourier series and its extensions. This thesis explores

the mathematical principle behind CT, demonstrating how periodic and non-periodic func-

tions can be decomposed into sinusoidal components to facilitate image reconstruction. We

begin by reviewing the Fourier series and its ability to represent periodic signals, and then

extend this concept to non-periodic functions through Fourier transforms. The connection …

Dynamics Of Prey-Prey Mutualism With Varying Carrying Capacity And Herd Behavior In The Presence Of Predator, Felix Dela Djokoto

UNF Graduate Theses and Dissertations

This study investigates the dynamics of mutualistic relationships between two prey species in the presence of a predator, by taking into account herding in one species along with the influence of carrying capacities between two prey species. These mutualistic dynamics are presented by constructing two mathematical models, namely an indirect and direct mutualism model. As the strength of the symbiotic relationship increases the indirect model goes through transcritical bifurcation to Hopf bifurcation whereas in the direct mutualism model goes through saddle-node bifurcation to Hopf bifurcation.

Geometric Properties Of Positive Definite Matrices: Means, Order, And Metrics, Blaine Dubois

UNF Graduate Theses and Dissertations

In this thesis, we study matrix means from a geometric point of view. In particular, we consider divergences of the form Tr[A + B − 2G(A, B)] for certain Geometric-Type matrix means G(A, B). We derive alternative formulations of this distance function through the application of one-sided inverses of G(A, B). When G(A, B) = A#B, we give a curve parametrization of the straight-line path between two points with respect to this semi-metric and present conditions under which this holds for other Geometric-Type means. For read- ability and self-containment, we introduce most of the preliminary concepts to build up to …

Continuing Development Of An Unmanned Vehicle For Conducting Scientific And Engineering Operations In The Littoral Zone, Peter S. Bohn

UNF Graduate Theses and Dissertations

The beach and near shore are among the most economically and environmentally important regions on earth, yet they remain poorly understood due to the challenges of surveying the surf zone and obtaining other important data during high-energy events. Traditional methods such as wading surveys, small watercraft, and specialized vehicles like the coastal research amphibious buggy (CRAB) are limited by safety risks, high mobilization costs, and restricted operating windows. The work conducted in this effort addresses these limitations by continuing development of a remotely operated vehicle (ROV) intended to be operational in harsh surf conditions to collect high-resolution bathymetric and hydrodynamic …

Diversity Makes Me Uncomfortable: Effects Of Diversity Language On University Student Belonging, Ziena Baker

UNF Graduate Theses and Dissertations

Diversity statements and experiences form the first impressions students have of their prospective universities and employers, setting the stage for perceived feelings of belonging, otherness, and comfort within new environments (Baleria, 2021; O’Keeffe, 2013; Starck et al., 2021). Diversity statements can signal feelings of comfort and belonging or feelings of stress depending on the way in which diversity is framed (Chaney, 2022; Trawalter et al., 2016). This is especially true for students, who are more often affected mentally and physically by changes in university diversity perspectives (Sladek et al., 2021) The current study thus uses a novel blood pressure measure …

Solar Energy Prediction Using Advanced Hybrid Machine Learning Models, Jelawi A. Alqhtani

UNF Graduate Theses and Dissertations

Accurate short-term forecasting of solar power generation is critical for the reliable and cost-effective operation of renewable-based microgrids, where sudden weather-induced variability can compromise grid stability, battery scheduling, and energy trading decisions. Traditional physical and statistical models struggle to capture the complex non-linear relationships and localized weather effects, while individual deep learning architectures often exhibit systematic biases such as chronic under-prediction of peak generation. This thesis proposes a novel Cross-Feedback Ensemble framework that combines the complementary strengths of Long Short-Term Memory (LSTM), Gated Recurrent Unit (GRU), and one-dimensional Convolutional Neural Network (1D-CNN) models through an iterative cross-feedback mechanism and a …

The Limits Of Strategic Adaptation: Continuity And Change In German And Russian Strategic Culture, Andrew W. Rios

UNF Graduate Theses and Dissertations

This thesis paper adopts a comparative historical analytical approach to German and Russian strategic culture. It examines numerous historical, cultural, and ideational variables that have guided German and Russian strategic initiatives, particularly since the end of the Cold War. It illuminates the ways in which these factors have contributed to the diverging paths of strategic adaptation adopted by Germany and Russia since the 2022 invasion of Ukraine. Utilizing theoretical concepts from strategic culture theory, historical and sociological institutionalism, and critical juncture theory, this paper argues that the Russian invasion precipitated a fundamental shift in Germany's strategic orientation vis a vis …

Emotional Balance, Health, And Resilience At The Start Of Covid-19 Pandemic, David Pincus, Bernard P. Ricca, Brooke Jenkins, Julia K. Boehm, Vincent Berardi, Amy C. Moors, David A. Frederick

Psychology Faculty Articles and Research

Self-organizing systems can shift between stability and flexibility in response to perturbation, a potential adaptive mechanism for understanding biopsychosocial resilience. Inverse Power-Law (IPL) structure, a frequency distribution that describes fractal patterns commonly produced by self-organization, produce measurements of stability and flexibility. This study applies these measures to emotional resilience at the start of the Covid-19 pandemic. Ratings of frequency over the past week (1-5 Likert scale) across 12 emotions (six positive and six negative) gathered in mid-April 2020 as part of a survey of adults’ (N = 4,094) pandemic experiences and health in the USA. The distributions of everyone’s emotion …

Rock: Riesz Occupation Kernel Methods For Learning Dynamical Systems, Victor W. Reilly, Chau Nguyen, Kamel Lahouel, Anthony Kolshorn, Nicholas Fisher, Bruno Jedynak

Mathematics and Statistics Faculty Publications and Presentations

We present a representer theorem for a large class of variational problems, generalizing regression, finite element methods, and providing techniques for learning partial and ordinary differential equations (PDEs and ODEs). We apply our formulation to the multivariate occupation kernel method (MOCK) for learning dynamical systems from data. Our generalized method outperforms the MOCK method on most tested datasets, while often requiring considerably fewer parameters. Experiments are presented for learning ODEs and PDEs.

The Stochastic Occupation Kernel (Sock) Method For Learning Stochastic Differential Equations, M. L. Wells, Kamel Lahouel, Bruno Jedynak

Mathematics and Statistics Faculty Publications and Presentations

We present a novel kernel-based method for learning multivariate stochastic differential equations (SDEs). The method follows a two-step procedure: we first estimate the drift term function, then the (matrix-valued) diffusion function given the drift. Occupation kernels are integral functionals on a reproducing kernel Hilbert space (RKHS) that aggregate information over a trajectory. Our approach leverages vector-valued occupation kernels for estimating the drift component of the stochastic process. For diffusion estimation, we extend this framework by introducing operator-valued occupation kernels, enabling the estimation of an auxiliary matrix-valued function as a positive semi-definite operator, from which we readily derive the diffusion estimate. …

Optical Coherence Tomography Harmonization With Anatomy-Guided Latent Metric Schrödinger Bridges, Shuwen Wei, Blake E. Dewey, Samuel W. Remedios, Bruno Jedynak, Shimeng Wang, Peter Calabresi, Shiv Saidha, Aaron Carass, Multiple Additional Authors

Mathematics and Statistics Faculty Publications and Presentations

Medical image harmonization aims to reduce the differences in appearance caused by scanner hardware variations to allow for consistent and reliable comparisons across devices. Harmonization based on paired images from different devices has limited applicability in real-world clinical settings. On the other hand, unpaired harmonization typically does not guarantee anatomy consistency, which is problematic because anatomical information preservation is paramount. The Schrödinger bridge framework has achieved state-of-the-art style transfer performance with natural images by matching distributions of unpaired images, but this approach can also introduce anatomy changes when applied to medical images. We show that such changes occur because the …

The Nature Of The Interplay Of Classical And Biblical Intertexts In Milton's Poetry, Timothy Windsor

School of Law, Humanities and Social Sciences Theses

Catabasis, the hero’s descent and return from the underworld, was the supreme heroic feat in classical myth and literature because it represented the accomplishment of the impossible: the conquest of death. Two out of three of the great ancient epics, Homer’s Odyssey and Virgil’s Aeneid, therefore, set the catabasis at the centre of the poem to mark its distinction. Previous scholarship has argued that Milton removed catabasis from the centre to outlying sections of Paradise Lost. My published work charts a new path in Milton studies, arguing that, by accommodating the action of his War in Heaven …

‘It’S Just So Much Work For Our Little Hands’: Exploring The Multi-Dimensionality Of Pre-School Children’S Lived Experience In Shaping Expressions And Perceptions Of Learning., Sasha Tregenza

School of Law, Humanities and Social Sciences Theses

This thesis creatively explores the multi-dimensionality of pre-school children's lived experience in shaping expressions and perceptions of learning within Early Childhood Education and Care (ECEC). Concepts of ECEC practice within England continue to be shaped by the lasting legacies of those regarded as early years ‘pioneers’, alongside theories of child development and an ever-increasing influence of governmental legislation and policy. Pioneers and policy combined, has led to growing emphasis upon school readiness and performativity culture, resulting in repeated and often unchallenged pedagogy within ECEC. This qualitative study draws upon aspects of facet methodology as a research orientation, to disrupt existing …

“Flies Don't Make Honey": An Exploration Of Preschoolers’ Feelings And Actions Towards Nature, Kathrin Paal

School of Law, Humanities and Social Sciences Theses

The burgeoning climate crisis resulting from anthropogenically enhanced global warming has made protection, restoration and affection for the environment an increasingly urgent matter. The irresponsible use of resources and pollution has caused, and will continue to cause, disastrous impacts on habitats and ecosystems globally; we urgently need to better care for the natural environment. Children’s perceptions towards nature are formed during early experiences. There is a research gap for age-appropriate methods to understand children’s perspectives whilst conceptualising them as the experts in their own lives and meaningfully enhancing their involvement in research. The aim of this thesis is to explore …

The Impact Of Socioeconomic Status On Substance Use Amongst The Hispanic Maternal Population, Emily C. Olivo

Honors Undergraduate Theses

Aim: To explore and synthesize existing research that focuses on the relationship between socioeconomic status and the use of substances amongst the maternal Hispanic population. By examining research and these factors, interventions can be identified to lower reported substance use rates amongst Hispanic mothers of childbearing ages.

Background: Minorities such as Hispanic women deal with a myriad of struggles, especially during motherhood. Socioeconomic status and substance use can contribute to a large part of the struggles faced by this population. Hispanic and Latina will be used interchangeably throughout this review of literature.

Method: A comprehensive electronic review of 3 databases …

An Examination Of Preservice Teacher Knowledge Of Attention Deficit Hyperactivity Disorder (Adhd) In The Elementary Classroom, Breana K. E. Webb

Honors Undergraduate Theses

This study examines the knowledge of preservice teachers with attention deficit hyperactivity disorder (ADHD) and how well prepared they might be when supporting students in elementary classrooms. ADHD is a diagnosed neurodevelopmental disorder in children and has been increasingly diagnosed over the past several years. Teachers play a crucial role in providing effective instruction to each and every student in the classroom. Managing classroom instruction with diverse learning capabilities and behaviors requires teachers to understand the characteristics of ADHD, as well as instructional adaptations and behavioral interventions, among preservice teachers. Findings indicate that while most preservice teachers recognize the basic …

Organization And Activation Of Caffeine Expectancies, Catherine S. Forsyth

Honors Undergraduate Theses

Caffeine is the most consumed and widely used psychoactive substance in the world. Whether someone uses caffeine or not, expectations about use can be influential to some degree. Expectancies exist everywhere and are extremely influential in all aspects of life. Regarding drug use, expectancies can affect behavior, outcomes, and one’s experience with the drug. Caffeine is no exception, caffeine expectancies have been seen to play a role in several actions such as the development, maintenance, and reinforcement of caffeine use. This study examined latent use profiles of caffeine and relationships between the profiles and the activation of caffeine expectancies. Multidimensional …

Remedios Varo: Peregrinaciones, Julia Condes

Honors Undergraduate Theses

At the time of her death, the artist Remedios Varo (1908–1963) left behind over 500 works of art, the majority of which were created in her adopted country of Mexico. Known for her meticulously crafted fantastical paintings, Varo underwent exile and displacement due to first the Spanish Civil War, and later World War II, which led her to relocate to Mexico, where she would create prolifically for the remainder of her life. This paper will examine the effect of those experiences on the artist and the work she produced, attesting to Varo’s ability to translate complex emotions regarding the human …

Community Redevelopment Agencies' (Cras) Perceptions Of The Legal, Ethical, Economic, And Financial Impacts On Florida's Redevelopment Since The Passage Of Florida House Bill 9 In 2019, Laurel L. Richmond

Honors Undergraduate Theses

This qualitative study explores the legal, ethical, economic, and financial impacts on Community Redevelopment Agencies (CRAs) following the passage of Florida House Bill (HB) 9 in 2019 by interviewing administrators and attorneys of the oldest Florida CRAs. CRAs are dependent special districts, funded by tax increment financing (TIF), and created to address areas deemed slum, blighted, or facing a shortage of affordable housing. HB 9 intended to address transparency and accountability issues and restore CRA operations and spending back to the original purpose, as authorized by Florida Statute 169.

The findings are timely and novel, given it has been five …

Assessing The Relationship Between Perceived Psychological And Physical Pain In Adults With Orthopedic Pain, Daniel C. Karimi Dehkordi

Honors Undergraduate Theses

Suicide remains a public health concern in the U.S., particularly among individuals experiencing chronic pain and psychological distress. This cross-sectional study investigated the relationship between perceived physical and psychological pain in 41 adults with chronic orthopedic conditions. The relationship between other risk and protective factors and perceived levels of pain distress was also examined. Results showed a significant positive correlation between psychological distress and physical pain (r(39) = 0.388, p < .05) and psychological distress and depressive/anxiety symptoms (r (39) = 0.477, p < .01). Psychological distress was moderately associated with feelings of hopelessness (r (39) = 0.403, p < .01), however, the relationship between physical pain and hopelessness was weak and nonsignificant (r (39) = -0.06, p = .71). Contrary to expectations, emotional support did not buffer the effects of psychological distress (r (39) = 0.07, p = 0.66). Mediational analysis confirmed that emotional support did not influence the relationship between physical pain and psychological distress (Beta (β) = -0.969, p = 0.572; Sobel Z = 0.5598, p = 0.575). Age was not correlated with psychological distress (r (39) = -0.24, p = 0.13) or mental health symptoms (r (39) = -0.05, p = .77). While there was no significant difference across sex, males reported higher mental health symptomatology and psychological distress scores than female counterparts. These findings underscore the direct impact of physical pain on psychological distress and challenge assumptions about the protective role of social support. The study highlights the need for integrated, multidisciplinary interventions targeting both physical and psychological pain to mitigate suicide risk among individuals with chronic orthopedic conditions. Future research should iii explore alternative support mechanisms and resilience-building strategies to address the complex interplay of pain, distress, and suicidality.

Intelligent Tutoring Systems In The Age Of Llm-Based Agentic Frameworks - Adapting Small On-Device Language Models For Fact-Checking And Student Compliance Detection, Evan Vahid Naderi

Honors Undergraduate Theses

As large language models (LLMs) demonstrate increasingly sophisticated language understanding capabilities, they offer transformative potential for educational technology, particularly in developing more responsive intelligent tutoring systems (ITS). To develop these systems, a synthesis that balances theoretical frameworks with practical, cutting-edge, and deployable technology would be useful. This thesis aims to advance the field of ITSs theoretically by viewing the modern advancements in natural language processing within the context of the foundational frameworks important to the fields of self-regulated learning, ITSs, and cognitive agents. Then, building on prior research on the ITS MetaTutor \citep{Azevedo2022}, this research focuses on how functions of …

Physical Activity And Hypertension Outcomes Around Menopause In Adult Women—A Secondary Analysis Of The All Of Us Research Program, Meriam F. Naguib

Honors Undergraduate Theses

Hypertension significantly impacts menopausal women due to a decrease in estrogen levels. That is due to estrogen level changes, causing many metabolic alterations, one of which is increased vascular resistance, leading to hypertension. Advanced treatments are made available to help alleviate the condition; however, lifestyle modifications—especially physical activity—show a critical role in hypertension control. This thesis explored the effect of physical activity as a non-pharmacological, lifestyle intervention on hypertension in women by menopausal status (pre-, peri-, and post-menopausal). This study used a secondary analysis with a retrospective design. Physical activity was defined using the American Heart Association's (AHA) guidelines (i.e., …

The Stigmatization Of Autism – Why It’S Still Present And How It Affects Women And Individuals Assigned Female At Birth (Afab), Emma Drauer

Honors Undergraduate Theses

The intent of this thesis is to explain some key factors (the theory of mind notion and the narrow perception of autism) that contribute to the stigmatization of autism and the impact this has on autistic women. Autistic women are heavily underrepresented, especially in the scholarly discourse, so this thesis collected first person accounts of autistic experiences through a survey and interviews. This data revealed important information such as the benefits of a diagnosis, how stigma can prevent this and have consequences, and the struggles autistic women face. Unmasking these struggles can help make the general public aware of their …

The Intersection Of Autism Spectrum Disorder And Mental Health: A Focus On College Students, Sudeepta Matha

Honors Undergraduate Theses

Rising prevalence rates of autism spectrum disorder (ASD), changes in diagnostic criteria, and increased public awareness have all contributed to the growing population of college students with ASD. However, many individuals - commonly referred to as the “lost generation” - go undiagnosed, due to experiencing negative interactions with mental health professionals. As a result, these individuals are not given the proper support and interventions required for a successful transition into adulthood, and often face heightened social isolation, academic problems, mental health challenges compared to their neurotypical peers. A combination of these factors can lead to increased suicidal ideation (SI) and …

Anxiety And Adaptive Functioning In Young Adults: The Moderating Role Of Psychological Flexibility, Makenzie L. Kennedy, Jeffrey E. Cassisi

Honors Undergraduate Theses

Anxiety is highly prevalent among emerging adults and is associated with impairments in academic, social, and daily functioning. While previous research has documented strong associations between anxiety and adaptive functioning, the present study uniquely tested psychological flexibility as a potential moderator that may foster resilience and adaptive coping.

Undergraduate students (N = 522) from the University of Central Florida completed measures of anxiety (PROMIS-A, GAD-7, STAI-S), adaptive functioning (WHODAS 2.0), and psychological flexibility (COMPACT-23). Confirmatory factor analyses supported distinct but correlated latent constructs of anxiety and adaptive functioning. Due to poor subscale intercorrelations, the COMPACT-23 total score was modeled as …

Generation Z’S Perception Of Skin Cancer And How It Relates To Climate Change, Piercen Bogolea

Honors Undergraduate Theses

Skin cancer is the most common cancer worldwide, and climate change has been identified as a significant contributor. Preventative action early on can help reduce occurrence, but it is unknown if Generation Z is aware of this and is taking the necessary action now to protect themselves. This research aims to gauge the perception of Generation Z on the severity of skin cancer, the relationship between climate change and skin cancer, and the prevalence of preventative measures being taken. A survey was distributed to students aged 18 to 27 enrolled at the University of Central Florida through mixed sampling. The …

Genomic Epidemiology Of Staphylococcus Aureus Sequence-Type 97, Eva Armao

Honors Undergraduate Theses

Staphylococcus aureus (S. aureus) is a gram-positive bacterial pathogen that colonizes human nasal passages, mucous membranes, or the skin of carriers, with colonization commonly found in 20-30% of healthy people. S. aureus has the potential for two types of infection within human hosts: methicillin-susceptible (MSSA) and methicillin-resistant (MRSA). These infections can be further classified based on their route of infection, either known as community-associated (CA), healthcare-associated (HA), or healthcare-associated community-onset (HACO). Upon further investigation of infected populations, specific genetic subtypes of S. aureus, known as sequence types (ST), have been identified globally, with some exhibiting increased virulence among …

The Yeasty Rise Of Conservatism By Fermenting Sourdough, Sydney M. Mcrae

Honors Undergraduate Theses

Baking has become increasingly popular in the last five years, particularly baking sourdough bread. This is evident through the rise of social media influencers focusing on trad-wife, family, and sourdough content. Trad wife is the term used to describe a a woman who lives a lifestyle that endorses gender roles, child-rearing, and taking care of the family. There is significant crossover between American social conservative ideals and a trad-wife. The emblem for a tradwife has become baking sourdough since the coronavirus pandemic. Previous research has linked the correlation between American social conservatism and the increasingly popular trad-wife phenomenon. Existing literature …

Multi-Criteria Gis Suitability Analysis For Sustainable Agricultural Tourism Site Selection In Peru, Jessica J. Mccord

Honors Undergraduate Theses

Agricultural tourism offers a mechanism to strengthen rural economies while preserving traditional practices and unique cultural identities. In the Peruvian Andes, rural communities confront increasing challenges in the face of a changing climate and reliance on industrialized agriculture. Rural communities attempt to strike a delicate balance between economic development and heritage preservation. This research utilizes a Geographic Information System (GIS)- based analysis to identify areas best positioned for the development of agritourism initiatives. The suitability analysis integrates both local and global sustainability priorities by incorporating a set of defined criteria that together identify areas that are the most appropriate for …