Digital Commons Network^™

Exploring System Identification Of Non-Linear Dynamics Using The Weighted Composition Operator And The Liouville Operator, Chukwuebuka Amagwula

USF Tampa Graduate Theses and Dissertations

System identification is the process of determining mathematical models that describe the dynamics of a system from data. Dynamic Mode Decomposition (DMD) and Sparse Identification of Nonlinear Dynamical Systems (SINDy) are two distinct approaches used for this purpose.

DMD identifies dominant spatiotemporal modes and eigenvalues that describe the evo lution of a system. It assumes a near-linear representation of dynamics and is closely linked to the Koopman operator, making it ideal for analyzing fluid flows, oscillatory systems, and modal structures. The DMD method uses time series data where each data point is referred to as a snapshot and represents the …

Conflicting Social Information And Its Impact On Sentence Comprehension In Young Adults With Dld: An Eye Tracking Study, Ansley Davis

USF Tampa Graduate Theses and Dissertations

Individuals must recognize linguistic and non-linguistic social cues to resolve contextual ambiguities in their conversations. When the linguistic and social cues match, sentence processing is facilitated. However, conflicts between linguistic and social stimuli (i.e., incongruency) can lead to prediction errors which slow sentence processing. Limited research has explored the social cognition conflict resolution skills in individuals with Developmental Language Disorder (DLD) despite their documented emotion processing deficits. This study considers the role of social prediction processing in adults with DLD as they engage in a social cognition conflict resolution task.

Young adults with DLD (n=29) and typically developing (TD) peers …

Gender Representation Of Composers In Recommended Wind Band Literature And Prominent Performances, Devon Alexis Gray Porter

USF Tampa Graduate Theses and Dissertations

The purpose of this research was to evaluate gender representation in recommended literature in wind band repertoire and prominent performances. I collected data from music lists approved by the National Band Association (NBA) state chapters, programs from the Midwest Clinic and College Band Directors National Association, music vendor catalogues, the Teaching Music Through Performance in Band series, and Florida Bandmasters Association (FBA) Music Performance Assessment (MPA) past performances. I evaluated names of composers to determine the male-female ratios and quantities for recommended works from these sources. I conducted further analysis to determine if trends existed in the relationships between composer …

Beyond The Hype: The Fundamental Challenges Of Machine Learning-Based Android Malware Detection In Cybersecurity, Guojun Liu

USF Tampa Graduate Theses and Dissertations

Machine learning (ML) algorithms have achieved remarkable success across various domains, including cybersecurity. Inspired by these advancements, the academic security community has explored numerous ML-based approaches for Android malware detection. While ML holds significant promise in this domain, its practical deployment faces substantial challenges, including data collection, feature selection, app representation across different models, performance instability across datasets, and inherent limitations of learning-based malware detection. These challenges can lead to overly optimistic detection results and weaken the reliability of malware detection frameworks.

Android malware detection has been extensively studied using both traditional ML and deep learning (DL) approaches. Although many …

Phosphorus: From The Origins Of Life To The Origin Of An Industry, Joshua Abbatiello

USF Tampa Graduate Theses and Dissertations

The element phosphorus is a key biogenic element that is often the limiting reagent for life. Phosphorus is quickly bound by metal divalent cations making it virtually insoluble and inert in water (forming the phosphate mineral apatite). Due to this, it becomes imperative to understand alternative pathways to increase biogenically available phosphorus in environments. To that end, this dissertation involved examining olivine as an alternative source of phosphorus to apatite, analyzing a novel grain of iron silicide found via lightning reduction in a fulgurite, and finally sought to understand the impact of phosphate mining through phosphogypsum stacks. Olivine is a …

The Synthesis Of A Photo-Affinity Probe Library For The Fatty Acid Amide Proteome And The Endocannabinoid System Within, Robert E. Feeney Iii

USF Tampa Graduate Theses and Dissertations

Fatty acid amides are a large family of endogenous metabolites with significant biological activity, including that of the endocannabinoid system. Currently little is known about how this system of tightly regulated compounds works within humans. This work lays the foundation to explore the structure-activity relationship driving the selectivity of ligand-protein interactions involved with fatty acid amides. A library of activity-based proteomic profiling probes for fatty acid amides has been synthesized to this end. Additionally, progress towards phytocannabinoid probes has been made as well.

An Exploratory Analysis Of Automated Deception Detection For Mental Health Applications, Sayde Leya King

USF Tampa Graduate Theses and Dissertations

Deception in mental health settings can undermine therapeutic relationships, compromise treatment efficacy, and impact patient outcomes. Yet, research shows that mental health clinicians often perform no better than chance at detecting deceptive behavior in therapy. Automated deception detection, leveraging artificial intelligence (AI) and multimodal behavioral cues—such as eye gaze, body gestures, and facial expressions—offers a promising alternative. However, most existing research focuses on high-stakes legal contexts, limiting its applicability to mental health settings.

This dissertation addresses this gap by pursuing three key research objectives using a mixed-methods approach. First, we investigate mental health clinicians’ perspectives on AI-assisted deception detection through …

Efficient Methods And Algorithms For Analyzing Stochastic Systems, Mohammad Ahmadi

USF Tampa Graduate Theses and Dissertations

This dissertation addresses the challenges of stochastic analysis of safety-critical systems with biological components, where unexpected behavior can lead to catastrophic events. Two fundamental challenges hinder the analysis of such systems: their typically large or infinite state spaces, and the extreme rarity of error states of interest. While Monte Carlo simulation can analyze biochemical systems without storing the state space, accurately estimating rare event probabilities becomes computationally prohibitive. Conversely, probabilistic model checking excels at analyzing extremely low probability events but becomes impractical for systems with large or infinite state spaces due to memory constraints.This work proposes two main contributions to …

Digital Resistance And The Political Economy Of Authoritarian Decline And Economic Liberalization In Ethiopia, Anaol Dalle

USF Tampa Graduate Theses and Dissertations

This dissertation aims to examine the impact increased consumption of digital technologies, like social media and the internet, has on the stability and autonomy of low-capacity authoritarian countries. By using Ethiopia (2015-2021) as a case study, the dissertation argues that the sudden adoption and proliferation of digital platforms serves as an exogenous shock that pushes the state into a critical juncture that unravels institutional equilibria and transforms domestic incentive structures and institutions. This creates a power vacuum, which triggers a period of intense, and often violent, competition between elite groups, significantly destabilizing the state. In the absence of a cohesive …

Learning Analytics: An Innovative Technological Tool To Help Increase Student Retention And Graduation Rates In Us Higher Education Institutions, Fednold Thelisdort

USF Tampa Graduate Theses and Dissertations

Higher education institutions (HEIs) have embarked on a journey of innovation by adopting learning analytics (LA) in their operation, offering a more sustainable and innovative technological tool to increase student retention and graduation rates in US HEIs. LA, an emerging academic and technological tool, equips HEIs to gather, analyze, and interpret their students’ data. Since the publication of the first (conceptual) framework by Burke (2019), LA has matured into a research focus and practice, implemented in several institutional contexts at different scales and disciplinary/pedagogical contexts. This study explored the impact of the use of LA on student retention and graduation …

Isotopic Fingerprints Of The Coastal Margins: Tracing Dissolved Iron Sources From Land To Sea, Hannah R. Hunt

USF Tampa Graduate Theses and Dissertations

Dissolved iron (dFe) is an essential micronutrient for sustaining life in the surface ocean. Nearly four decades of research dedicated to understanding sources, cycling and biogeochemical modifications of Fe sources in the global oceans has generated a significant body of research supporting the idea that the concentration of Fe in the surface ocean exerts significant controls on primary production and carbon uptake in the surface ocean. Creation of the GEOTRACES program greatly increased the spatial and temporal resolution of high-quality trace element and trace element isotope data revealing new insights into the global Fe cycle, especially through the use of …

Applications Of Contracting Self-Similar Groups To Cryptography And Scale Groups, Arsalan Akram Malik

USF Tampa Graduate Theses and Dissertations

Given their peculiar properties, self-similar groups are of great interest both from applications and theoretical standpoints. In this work we study the scope of their applications in post-quantum cryptography and in constructing scale groups via lifting maps.

We propose self-similar contracting groups as a platform for cryptographic schemes based on simultaneous conjugacy search problem (SCSP). This class of groups admits fast polynomial-time algorithms for the word problem and element multiplication that can be used for effective encryption and decryption of messages. It contains extraordinary examples like the Grigorchuk group, which is known to be non-linear, thus making some of existing …

Healthy Bodies, Moral Minds, And Rural Ideals: Contextualizing Interwar British Childhood And Citizenship Through Children's Country Holidays Fund Vacations, Paula J. Pack

USF Tampa Graduate Theses and Dissertations

This dissertation uses the Children’s Country Holidays Fund (CCHF) as a critical lens to examine how philanthropy, childhood, class, public health, and rural nostalgia intersected within the broader context of citizen formation in interwar Britain. Founded in 1884 to provide country holidays for poor London schoolchildren, the CCHF evolved from a philanthropic response to Victorian slum life into an informal arm of welfare governance by the end of the interwar period. Through its country holidays, the Fund became an active participant in shaping ideals of health, morality, and civic responsibility in a period marked by heightened concern over national vitality …

Physical Activity And Functional Mobility In Adults With Hearing Loss: A Series Of Embedded Studies Within A 6-Month Clinical Trial With Hearing Aids, Sarah L. Bochat

USF Tampa Graduate Theses and Dissertations

Adults with hearing loss engage in low levels of physical activity and demonstrate poor performance on measures of functional mobility. The impact of hearing rehabilitation on these outcomes is not fully understood. Previous investigations were largely quantitative and focused on older adults ≥ 65 years of age who may respond differently to hearing intervention than relatively younger adults. They also tended to focus on exercise rather than global engagement in physical activities and did not report hours of hearing aid use, an important indicator of intervention success. One purpose of this dissertation was to determine the feasibility of collecting accelerometry-assessed …

Room-Temperature Multiferroic Epsilon Iron Oxide Semiconductors: Thin-Film Growth And Characterization, Derick Detellem

USF Tampa Graduate Theses and Dissertations

There is an ever-growing need for larger computing power, nonvolatile memory and energy efficient devices as the number of applications that draw upon the current base of computer resources increases. At the forefront of research aiming to meet this need is the field of multiferroics. If it is possible to leverage the fast and energy efficient application of an electric field with the data storage capabilities of magnetic materials, then it would be possible to not only increase the robustness and energy efficiency of current memory, but possibly present new types of device components for computation application as well. Currently, …

Affirmation And Aspiration: Black Women Enrolled In Doctoral Programs At A Pwi Striving For The Tenure-Track, Anayah Alicia Walker

USF Tampa Graduate Theses and Dissertations

Black women remain vastly underrepresented in tenure-track positions at research universities in the United States, facing systemic barriers that hinder their academic progression. This study examines the experiences and strategies that contribute to Black women’s preparation for tenure-track positions while enrolled in doctoral programs at a predominantly white institution. Grounded in Black feminist thought coupled with an appreciative inquiry lens, this study utilized the sista circle methodology to capture the narratives of seven Black women from various academic disciplines. Findings revealed three experiences that contribute to Black women’s preparation for tenure track positions: intrinsic motivation, funding and institutional resources, and …

The Role Of Langmuir Circulation In Coastal Flows Driven By Wind, Waves And Tides, Thathsarani Dilini Herath Herath Mudiyanselage

USF Tampa Graduate Theses and Dissertations

Langmuir Circulation (LC) is a wind and wave-driven process and is a key driver of vertical mixing and transport in the ocean. In coastal shelf regions, LC can span the entire water column, linking surface and bottom boundary layers and amplifying turbulent mixing. However, the influence of LC on vertical mixing and cross-shelf transport in shallow, tidally forced coastal waters remains poorly understood. This dissertation addresses this knowledge gap by developing a novel modeling framework based on the Reynolds-Averaged Navier–Stokes (RANS) equations, offering a computationally efficient alternative to more resource-intensive Large Eddy Simulations (LES).

The proposed RANS-based approach is first …

Does Practice Make Perfect? Examining The Impact Of Text-Based Reminders On Adherence In The Helping Our Toddlers, Developing Our Children’S Skills Program, Lauren Patrusky

USF Tampa Graduate Theses and Dissertations

Disruptive behavior disorders (DBDs) are prevalent in approximately 17% of children ages birth to 5 years (CDC, 2023). DBDs can significantly impact a child’s learning, social-emotional wellbeing, and ability to develop and maintain healthy relationship (CDC, 2023). Behavioral parent training (BPT) has been proven effective in reducing disruptive behavior and improving parent-child relationships. However, many families do not fully engage in treatment, leading to poor outcomes for both the child and the family. Chacko (2016) describes BPT engagement as enrolling in treatment, attending weekly sessions, participating in group discussions or role plays in sessions, practicing skills between sessions, and completing …

On Some Hypergraph Coloring Algorithms, Boyoon Lee

USF Tampa Graduate Theses and Dissertations

Of a given bipartite graph G = (V, E), it is elementary to construct a bipartition in timeO(|V |+|E|). For a given k-graph H = H(k) with k ≥ 3 fixed, Lovász proved that deciding whether H is bipartite is NP-complete. In this thesis, we consider the average running time of this problem. For that, let B_n = (B^(k))_n be the collection (family) of all bipartite k-graphs H on the fixed vertex set [n] = {1, ...., n}. We construct, of a given H ∈ B_n, a bipartition in time averaging O(n^k) over the class B_n. We provide two proofs …

Which Adolescents Benefit Most From Positive Psychology Interventions: Examining The Common Factors Of Therapeutic Change, Nicolette Bauermeister

USF Tampa Graduate Theses and Dissertations

The literature has found positive psychology interventions to be effective at improving the subjective well-being of youth (Tejada-Gallardo et al., 2020). Further research is needed to identify variables such as common factors of change that could be contributing to whether youth report improved outcomes after participating in a positive psychology intervention. This study examined common factors of therapeutic change as predictors for outcomes such as positive affect, negative affect, and life satisfaction, which are components of subjective well-being. This dissertation aimed to fill the gap in the literature regarding common factors of change as predictors of outcomes in school-based positive …

Algorithms Of Eversion: Contemporary States And Digital Sovereigns, James Libengood

USF Tampa Graduate Theses and Dissertations

The rapid development of artificial intelligence (AI), the internet of things (IoT), and digitization have pushed digital sovereignty to the top of the governance agenda in the 21st century. This notion is expanded upon in this work through seven chapters encompassing theoretical underpinnings, methodological frameworks, and real-world case studies. It shows how multinational corporations dominate digital coloniality, and how the merge of physical and digital reality or eversion poses challenges. The study compares contrasting governance approaches, such as the European Union’s General Data Protection Regulation (GDPR), geared to ethical AI and data protection, versus BRICS nations’ stance on data localization …

The Only Constant Is Change: The Role Of Genetic Diversification In Cancer And Beyond, Malgorzata Tyczynska Weh

USF Tampa Graduate Theses and Dissertations

Genetic diversification, the process by which genetic variation arises in a population, is fundamental to evolution by natural selection. Mutation, a central diversification process, fuels adaptation across species, including in cancer. Yet most new mutations are neutral or deleterious on cell fitness, raising the question of how mutation-driven adaptation persists. To explore this paradox, I developed a spatial agent-based model (ABM) in which population fitness emerges from individual cells acquiring mutations at varied rates and with diverse fitness effects. I evaluated model behavior across adaptive states, mutation rates, and distributions of fitness effects. The results show that high mutation rates …

Exploring Culturally Responsive Literacy Practices In Prekindergarten: A Multimodal Approach By Teachers, Deeksha Thonta Aradhya

USF Tampa Graduate Theses and Dissertations

Children from culturally and ethnically diverse backgrounds are often expected to learn within different cultural contexts than those they have experienced in their families, homes, and communities. Some children are rarely exposed to the dominant culture and practices that are highly valued in schools before entering early education settings. When they start (pre)school, young children are often expected to immediately participate in cultural practices that may differ from those at home, which are considered indicative of being successful, ready, or capable. This research aimed to investigate the culturally responsive literacy practices used by teachers in a laboratory prekindergarten classroom. The …

Cinematic Abuse: A Critical Analysis Of Disney’S “Happily Ever After” In The Little Mermaid, Aladdin, And The Princess And The Frog, Erin Michelle Gough

USF Tampa Graduate Theses and Dissertations

This dissertation examines the manner in which three animated Disney princess films cultivate stereotypes and gendered behaviors consistent with domestic violence and thereby encourages viewers to accept and tolerate abuse against women. I argue that due to the dangerous, constricting, and sexist gender roles encouraged by the Walt Disney Corporation, films prime young girls and boys to react to social situations and encounters in a way that mirror the characters’ reactions. Because of the films’ entertainment value, most of the characters’ inappropriate, stereotypical, and often violent behaviors either go unnoticed or are passively accepted. The violence does not have to …

The Epistemologization Of Scientific Knowledge: Scientific Textbooks And Education In The 18th And 19th Centuries, Brian P. Bieganski

USF Tampa Graduate Theses and Dissertations

Philosophy, despite its proclivities towards history and contextualization, often neglects to properly note various characteristics of ideas. In particular, there seems to be a kind of blindness to a key component of how ideas come into being: namely, the role of writing that leads to the preservation and transmission of ideas. Textbooks, for instance, are a key instrument for containing, disseminating, and archiving knowledge of a specific domain that can be used to introduce those complex concepts to newcomers and the unspecialized. As such, a textbook is an epistemic device used for transmitting a condensed constellation of ideas, concepts, formulas, …

Evaluating Behavioral Skills Training To Teach Salsa Dancing Skills To Adults With Autism Spectrum Disorder And/Or Intellectual Disabilities, Joshua I. Nieves

USF Tampa Graduate Theses and Dissertations

Research has demonstrated behavioral skills training (BST) to be an effective teaching procedure for acquisition of a variety of skills among both neurotypical and neurodiverse individuals across different ages. Moreover, recent studies have demonstrated the effectiveness of BST for enhancing sports performance when training neurotypical children and adults. However, there is limited research on the effectiveness of BST for enhancing sports performance, and specifically dance performance, among individuals with autism spectrum disorder (ASD) and/or intellectual disabilities (ID). Dance is a recreational activity that can serve as a form of physical activity for children and adults. Salsa is a Latin style …

Hierarchical Reinforcement Learning (Hrl) In Multi-Goal Spatial Navigation With Autonomous Mobile Robots, Brendon Johnson

USF Tampa Graduate Theses and Dissertations

Hierarchical reinforcement learning (HRL) is hypothesized to be able to take advantage of the inherent hierarchy in robot learning tasks with sparse reward schemes, in contrast to more traditional reinforcement learning algorithms. In this research, hierarchical reinforcement learning is evaluated and contrasted with standard reinforcement learning in complex navigation tasks. We evaluate unique characteristics of HRL, including their ability to create sub-goals and the termination function. We constructed experiments to test the differences between PPO and HRL, different ways of creating sub-goals, manual vs automatic sub-goal creation, and the effects of the frequency of termination on performance. These experiments highlight …

Untangling The Threads Of Hope: A Qualitative Media Analysis Of Discourse Relating To Futures For Sickle Cell Disease, Amanda R. Malerba

USF Tampa Graduate Theses and Dissertations

Sickle cell disease (SCD) is the most common inherited blood disorder worldwide, with a disproportionate burden on people of African ancestry. Life with this illness is characterized by chronic physical pain, overlapping health conditions, and often early death. In the United States, the physical symptoms of the disease are frequently compounded by experiences of racial inequality and oppression embedded in the medical system that contribute to detrimental outcomes. Because of the complex biocultural web of factors contributing to the suffering of people with SCD, much of the anthropological scholarship surrounding this illness prioritizes deconstructing systems of power, oppression, and inequality. …

Sense Of Immortality As A Death Anxiety Buffer: An Investigation Through Awe, Sabrina J. Eisenberg

USF Tampa Graduate Theses and Dissertations

This thesis investigated the emotion awe as protective against mortality salience by fulfilling sense of immortality – a proposed need created by mortality salience. Mortality salience has been shown to increase cultural worldview defense, which sometimes has detrimental social effects. This study aimed to test if inducing feelings of awe would reduce the need to rely on cultural worldview defense in response to mortality salience. The pilot study (N = 239) found evidence for a relationship between awe and sense of immortality. The primary study (N = 167) tested a main effect of mortality salience on cultural worldview defense (H1) …

An Application Of A Positive Psychology Intervention To Promote The Well-Being Of Children With Cancer, Jenna Barnes

USF Tampa Graduate Theses and Dissertations

The psychological impact of pediatric cancer and cancer treatment is not well understood. Although there is evidence to suggest that pediatric cancer may negatively impact youth’s mental health and psychological functioning, other research suggests that the mental health of children with cancer is similar to that of healthy peers. Traditional psychological interventions have been used to reduce symptoms of psychopathology among children with cancer. However, less is known about the subjective well-being of children with cancer and evidence-based, positive psychology interventions to promote the subjective well-being of this population. Thus, this study sought to address this gap in the literature …