Digital Commons Network^™

Developing Imitation Learning Policies By Exploring Diffusion Framework For Quadcopters, Likith Swamireddy

Theses and Dissertations

Imitation learning offers a promising approach in developing near-optimal onboard policies for nonlinear systems, by learning from computationally expensive trajectory planners during offline training. Existing State-of-the-art methods commonly learn deterministic mappings from observations to actions by training fast neural networks to mimic the expert demonstrations, which can limit their ability to capture the action distribution, when the policy is trained on multiple possible expert commands to reach the same target, and this may lead to unsafe scenarios in the obstacle environments. To address these challenges, this study explores Diffusion Models (DMs) as a feedback controller for quadcopters that learns the …

Study Of Fast Switching Metastable-State Photoacids And Controlled Drug Release From Polycaprolactone (Pcl) Vascular Scaffold, Rana Salman Abbood Abbood

Theses and Dissertations

Metastable-state photoacid (mPAH) has become a common tool for controlling and driving chemical processes with light. mPAHs with fast reverse reactions are desirable for precise temporal control or generating quick pulses of proton concentration. In this work, different approaches towards fast reversing mPAHs are studied. Experimental and computational results showed that stabilizing the charge–transfer intermediate is an effective way to increase the rate. A novel mPAH with a reverse reaction ≈500 times faster than the most widely used mPAH in methanol has been developed. Another water-soluble mPAH exhibited a reverse reaction with a rate constant of 7.8 s−1, the fastest …

A Study On Some Distance Based Domination Parameters In Graphs And Their Applications, Shanmugavelan S Mr

Theses and Dissertations

Distance-based domination has emerged as a significant development in graph theory, attributed to its applications in communication systems, interconnection networks, parallel architectures, and chemical graph models. This thesis focuses on two such graph invariants: hop domination number and 2-hop domination number of graphs. The hop domination number of some generalized graph structures like generalized thorn paths, generalized theta graphs, and snake graph families is studied along with a newly introduced family, namely generalized ciliates.

Moreover, a variant of hop domination number, namely, the 2-hop domination number, is studied for some grid families like ladder, hexagonal grid, and its variants. Furthermore, …

A Fundamental Study Of Fatty Acid Ionic Liquids And Their Effects On Biomolecules, Achismita Dutta

Theses and Dissertations

Fatty acid ionic liquids (FAILs) are a class of ionic liquids (ILs) with relatively low toxicity and potential applications in biological systems. This study examined the interactions of tetramethylguanidinium decanoate, tetramethylguanidinium octanoate, choline decanoate, and choline octanoate with lipid membranes, proteins, and nucleic acids. Membrane leakage experiments using model lipid vesicles showed that decanoate-based FAILs produced greater membrane permeabilization than octanoate-based analogues, consistent with their higher membrane permeability. These effects were stronger for the ILs than for decanoate alone and occurred below the critical micelle concentration (CMC), suggesting that micelle formation may not be essential for membrane disruption. The ability …

A Hybrid Rule-Based And Large Language Model Framework For Extracting Acronym–Definition Pairs From Scientific Literature, Petro Skrypnyk

Theses and Dissertations

Authors of scientific papers rely heavily on acronyms and often use them without defining them, making the literature harder to read and index. This thesis develops and evaluates a hybrid rule-based and large language model (LLM) framework that extracts acronym–definition pairs from scientific PDF documents. It extends an earlier Rowan University system that combined a regular-expression parser with a single LLM on 200 papers. That system showed that neither the parser nor the LLM alone is sufficient for accurate extraction of the pairs. The framework is a fully automated pipeline from PDF input to scored results. It compares four LLM …

Effects Of Social Comparison Instructions On Affect, Motivation For Healthy Behavior, And Health Behavior Selections: Guidance To Identify Or Contrast, Raj Harsora

Theses and Dissertations

Engaging in healthy behaviors early in life is crucial for preventing noncommunicable diseases such as type 2 diabetes, cancer, and heart disease. College is an optimal period to establish these habits, yet students often engage in poor dietary and physical activity practices; thus, identifying effective health behavior change techniques for this population is essential. Social comparisons are known to influence health behaviors, yet no research has tested comparison instructions as a behavior change technique, particularly identification versus contrast with upward and downward targets. Using a preregistered protocol (https://osf.io/z29en), we tested whether guiding college students (N=664) to identify with or contrast …

Problematic Technology Use And Quality Of Life In College Students With Varying Levels Of Schizotypy, Joseph P. Skinner

Theses and Dissertations

Problematic Technology Use (PTU) has emerged as a growing concern with technology’s continual integration into daily living. Individuals higher in schizotypy may be particularly vulnerable to the negative consequences of digital environments. The present study cross-sectionally examined associations among schizotypy, PTU, and quality of life (QOL) in 533 college students using structural equation modeling. Consistent with hypotheses, greater total schizotypy was associated with higher PTU and lower QOL. Additionally, positive, negative, and disorganized schizotypy all uniquely predicted poor QOL with the negative domain demonstrating the strongest standardized association. Contrary to hypotheses, PTU did not significantly moderate the relation between total …

The Impact Of Stigma On The Mmpi-3 Scores Of An Indo-Caribbean Community Sample, Julia Persaud-Naipaul

Theses and Dissertations

Evaluation of personality and psychological disorders is accomplished through the use of psychometric measures. However, tests require interpretation of test responses using a normative criterion based on a particular population that may not fully consider the effect of cultural influences on an individual’s level of willingness to report psychological difficulties. For example, individuals in collectivistic cultures may not be as willing to self-report problems because mental illness is often perceived as a source of embarrassment and shame. One culturally unique population that has been overlooked in psychological assessment is the Indo-Caribbean population. Their specific cultural values, beliefs, attitudes, and practices …

The Game Within: An Anthropological Approach To Games And Play, Nehal Maged Mohamed

Theses and Dissertations

This thesis is based on an eighteen-month ethnography of El Ghawasa, an Egyptian play-based organization that designs educational games, tools, and services. Claiming that El Ghawasa, with its ethos of play, seeks to create an alternative to the capitalist corporate structure. Through tracking how this organization navigates ruptures, negotiates constraints, and experiments with different practices and internal restructuring, I explore the possibilities and limitations of El Ghawasa, while attempting to resist absorption by the very system it opposes. I ask: when the rules keep changing (while the logic of the capitalist corporate structure remains the same), and the boundaries of …

Representations Of Cartel Leaders In Narcocorridos: A Reflexive Thematic Analysis, Gael Gamboa

Theses and Dissertations

Narcocorridos have become one of the most recognized expressions of narcoculture in Mexico. Despite growing scholarly interest in narcoculture, relatively few studies have examined how cartel leaders are represented across narcocorridos. This study addresses this gap by examining the symbolic representations of Joaquín “El Chapo” Guzmán, Miguel Ángel Félix Gallardo, and Amado Carrillo Fuentes in narcocorrido lyrics. The study is guided by cultural criminology and subculture theory; this study employed a qualitative research design using reflexive thematic analysis. A purposive sample of 25 narcocorridos was analyzed to identify recurring patterns in the representation of cartel leadership. As a result, six …

Development Of Quantum Cryptographic Algorithm For Next Generation Secure Systems, Gururaja Ts Mr

Theses and Dissertations

The rapid advancement of digital communication and quantum technologies are developing at an accelerated pace makes cybersecurity and data protection a big challenge. The traditional cryptographic methods are increasingly under attack by phishing, brute force, cryptanalytic attack and threats of quantum computing. This research presents a quantum-secure communication based on Quantum Random Number Generator (QRNG), Quantum Key Distribution (QKD), Quantum Image Encryption (QIE) and secure quantum key access using a dongle-based hardware.

QRNG models were designed in the quantum simulator and hardware. The sequences produce high entropy and they passed the statistical randomness tests with p-values higher than 0.01 indicates …

Workers Authoring Assessment: Play And Power In Early Childhood Education, Phoebe M. Gilpin

Theses and Dissertations

Researchers assert that play-based pedagogy is an effective approach to teaching young children, but there is less consensus on the specific methods of play-based teaching. This mixed-methodology exploratory case study investigated early childhood (EC) educators’ conceptualizations of play-based pedagogy in three phases: Phase 1’s quantitative measure testing found a mismatch between researchers’ conceptualization of play-based pedagogy and EC educators’ (n=183) understandings. In Phase 2, EC educators (n=3) articulated their perspectives about teaching through play and co-authored a new tool, the Teacher-Authored Play and Teaching Scale (TAPTS). Within Phase 3, EC educators (n=60) completed the TAPTS, which I interpreted through a …

Dual-Polymer Concrete With Recycled Pet And Hdpe Aggregates: Mechanical And Durability Performance Assessment, Omar Abd El Mageed Hammouda

Theses and Dissertations

This study investigates the fresh, mechanical, durability, thermal, performance as well as preliminary financial aspects of dual-polymer concrete incorporating recycled polyethylene terephthalate (PET) as a partial replacement for fine aggregate and recycled high-density polyethylene (HDPE) as a partial replacement for coarse aggregate, with silica fume as a supplementary cementitious material held constant at 10% by weight of cement. The study responds to the convergence of two pressing challenges in the Egyptian context: the scale of plastic waste mismanagement, which results in widespread informal open burning and environmental contamination, and the high operational energy demand of residential buildings in Egypt's hot …

Developing An Object Level Understanding Of Sine And Cosine As Ratios And A Coherent Trigonometry, Jeffrey Peter Nair

Theses and Dissertations

Solving right-triangle problems as well as integrating right-triangle and circular trigonometry into a coherent understanding are documented challenges for students. Prior research has deeply investigated students constructing ratio meanings for sine and cosine using a circle-first approach, which then can be extended to right triangles. Also, past work has separately documented distinct meanings that are useful for sine and cosine, in addition to the ratio meaning, including as lengths in a unit circle and coordinate points. This study took these existing ideas and put them together into one possible developmental progression, based on APOS theory, where students can learn length, …

Actionable Hydrologic Data To Information With National Water Model-Based Derived Dataset, Cutting-Edge Data Services, And Agentic Ai System, Sujan Chandra Mondol

Theses and Dissertations

Hydrologic data are the cornerstone of many complex hydrologic research and operational workflows that produce useful hydrologic information for water resources decision-making, flood risk communication, and water availability implications. The National Water Model (NWM) is a valuable source of hydrologic data, particularly for its extended coverage of unmonitored streams and the large-scale continuity of hydrologic processes. Precomputed secondary datasets derived from this simulated data, such as streamflow indices, can improve operational efficiency through thresholding. Disseminating the data through modern technologies, such as application programming interfaces, is required for ready integration into applications. However, if extraction requires an intermediate service, there …

"Tithing Is An Insurance Premium": A Framing Analysis Of Speaker Innovation And Diachronic Trends In Latter-Day Saint Religious Discourse, Reid Empey

Theses and Dissertations

Religious language relies on shared metaphor and frames that contextualize religious experience and practice. Current approaches to frame semantics (Fillmore 1982) and cognitive metaphor (Lakoff & Johnson 1980) lend important insight into religious language, particularly in describing the role that figurative language serves in a religious speech community. However, a vital component of many religious speech communities is the presence of and engagement with a scriptural canon, which often contains metaphorical and framing language that religious speakers can directly reference. Yet, past conceptualizations of speech communities have not accounted for this engagement with a shared canon. To illustrate the role …

Synthetic Strategies For Bioactive Peptides: From Aggregation Inhibitors To The Total Synthesis Of Tunicyclin C, Stephanie Graciela Garcia Morin

Theses and Dissertations

In Alzheimer's disease (AD), a brain protein called "tau" abnormally clumps and forms neurofibrillary tangles (NFTs), causing damage to brain cells. Ac-PHF6-NH2 is a hexapeptide segment of tau protein that plays a dominant role in tau aggregation and is used as a model to design tau protein aggregation inhibitors. In this research we synthesized four dehydroamino acid (□AA) containing PHF6 analogues with △Abu (derived from L-threonine) and △Val (derived from □-OH-Valine) at position 2 or 3 via dehydrations or azlactone ring-openings as key reactions. We evaluated their proteolytic resistance, ability to inhibit aggregation of PHF6, and impact on the morphology …

Measuring Proteostasis Changes In Apolipoprotein E Mouse Models Using Quantitative And Kinetic Proteomic Methods, Ariel E.A. Denos

Theses and Dissertations

Alzheimer's Disease (AD) is a neurological disorder associated with brain mass loss and cognitive decline. It affects millions of elderly people and is currently uncurable. Since 1906, when the disease was first described, researchers have uncovered many components of AD pathology. However, it is now evident that curing Alzheimer's Disease will require intervention before the pathological onset of amyloid beta plaque deposition, tau neurofibrillary tangles, and associated neuronal loss. Studying AD from the perspective of early intervention requires special attention to small changes that may disrupt the normal processing of cells. Cells undergo a natural cycle of creation and destruction …

Multi-Band Extinction Modeling In Early-Type Galaxies With Circumnuclear Disks, Nonnie Bash

Theses and Dissertations

In this thesis, we present a spatially resolved, multi-band dust-attenuation method for correcting the stellar luminosity models used in dynamical supermassive black hole (BH) mass measurements. If uncorrected, dust extinction effects may dominate over other systematic uncertainties when determining the BH mass ($M_\mathrm{BH}$). We expand on a simple dust-attenuation method that treats the circumnuclear disk as a thin dust layer embedded in the galaxy midplane. Using a Multi-Gaussian Expansion, we create a three-dimensional stellar luminosity model to calculate the fractions of stellar light originating in front of and behind the disk along each line of sight. We infer the pixel-by-pixel …

Development And Validation Of The Global Impact Of Chronic Illness Scale – Universal, Abigail Kukay

Theses and Dissertations

The current manuscript presents the development and validation of the Global Impact of Chronic Illness Scale – Universal (GICIS-U), a novel measure of chronic illness impact through three separate studies. The pilot study aimed at measure development, which included item selection and two rounds of item refinement using feedback gained through four focus groups. Study 1 consisted of an exploratory factor analysis (EFA) to determine factor structure of the measure. Participants were 183 individuals recruited from an online participant pool and social media outlets who completed the refined GICIS-U online. Results of the EFA suggested a six-factor structure, of which …

Engineering Education Beyond The Engineering Classroom: Three Studies On Behavioral Nudges, General Education Completion, And Honors Program Participation, Andrew Harrison Volk

Theses and Dissertations

Engineering education extends well beyond the engineering classroom. Engineering undergraduates progress through general education courses, institutional support structures, and enrichment opportunities operating outside their major. The administrative offices that shape these non-engineering experiences typically operate independently of engineering departments, and the structural decisions they make can shape the engineering student's experience without engineering's input. This dissertation examines three settings in which decisions outside engineering matter for engineering students. Study 1 reports a PRISMA-format systematic review of nudge interventions in higher education, developing a four-category typology of nudge types (informational, environmental, process-oriented, and in-name-only) and a six-category typology of application domains. …

Thermomechanical Characterization And Modeling Of An Smp-Epoxy Composite For Deployable Space Structures, Ap Anshuman Behera

Theses and Dissertations

Deployable space structures can be stowed in a compact form and later allowed to their operational shape. Carbon fiber reinforced polymer (CFRP) composites have been utilized as a material candidate due to their increased strength-to-weight ratio and tailored performance. Current challenges associated with CFRP composites are driven by the viscoelastic nature of the polymer matrix causing long-term stowage effects and deployment issues such as shape deformation and incomplete recovery. In this study, a shape memory polymer (SMP) is presented as a potential option in mitigating these issues. An epoxy SMP is synthesized and experimentally characterized and its performance in the …

Simulating Wind-Induced Temporal Variability In Gnss Transmissometry Via Coherent Bistatic Scattering, Brantley Allen Forrest

Theses and Dissertations

Global Navigation Satellite System Transmissometry is a technique for forest remote sensing. Interpreting these measurements requires physically based models to relate observed signal behavior to underlying biophysical parameters. A limitation of current electromagnetic modeling approaches is the assumption that vegetation optical depth is static. In practice, forest canopies, and therefore vegetation optical depth, are dynamic systems continuously influenced by wind. These geometric changes alter the scattering environment and introduce temporal variability in the received signal, particularly through phase-sensitive multipath interactions. This thesis presents a methodology for simulating wind dynamics for first-order scattering. The approach integrates a procedural, stochastic aeroelastic wind …

Ocean Salinity Effects On Lightning Frequency And Distribution In The Inner Core Of Tropical Cyclones In The Atlantic Basin, Desiree Knight

Theses and Dissertations

Different oceanic salinity profiles seen in the Atlantic have been found to influence tropical cyclone (TC) intensity. With the freshwater plume from the Amazon-Orinoco reaching into a TC development region during peak hurricane season, the stable ocean feature it creates has effects on SST, ocean mixing, enthalpy fluxes, and convection. This study investigates the relationship between sea surface salinity (SSS) and inner-core lightning of north Atlantic TCs and further explores the spatial variations of this relationship with TC intensity. SSS values are collocated with lightning flashes, which are split between “fresher” and “saltier” waters. Further investigations found that TCs have …

How Family Functioning Impacts Adolescent Outcomes: The Roles Of Cohesion, Flexibility, Communication, Satisfaction, And The Family Environment On Well-Being Across Levels Of Family Complexity, Emily E. Shaw

Theses and Dissertations

This dissertation research is a combination of two studies. The overarching and guiding focus for this study involved how family functioning and environments influence adolescent psychological well-being, and do these associations vary based on levels of family complexity. Study 1 examined family complexity and family environments as potential predictors of family functioning, while Study 2 examined family functioning and family complexity as potential predictors of adolescent negative (i.e., anxiety and depression) and positive (i.e., engagement, perseverance, optimism, connectedness, and happiness) well-being. In Study 1, family complexity was not predictive of family functioning, but the family environment was a strong predictor. …

Exploring Rural Ap Stem Motivation, Interests, And Aspirations: A Self-Determination Theory Lens, Erin Seger Mcguire

Theses and Dissertations

Science, technology, engineering, and mathematics (STEM) have become the focal point of many countries around the world, with the intention of strengthening national renown by being the first to make advancements in STEM domains. The United States has recognized the importance of STEM and STEM education, though these efforts are lacking in rural areas, like Mississippi. These schools often serve underrepresented populations and may be unable to financially support learning opportunities inside and outside the classroom. Additionally, the national teacher shortage disproportionately affects science and mathematics classes; in rural schools, teachers in these areas may be underqualified, as the schools …

Development Of Genomic Tools To Improve Science-Based Management Of American Black Bears (Ursus Americanus), Fabian A. Jimenez

Theses and Dissertations

American black bear (Ursus americanus) monitoring programs often use minimally invasive genetic monitoring techniques (hair snares) to estimate abundance and density. Historically, microsatellites have been used to identify individuals from hair samples and create mark-recapture histories to estimate population size. However, microsatellite-based genotyping requires multiple replicates and visual confirmation of consensus genotypes. Advances in genetic sequencing technology have led to methods like Genotyping-in-Thousands by sequencing (GT-seq), which allow automated genotyping using bioinformatic pipelines, thereby reducing the number of replicate samples required to confirm genotypes and increasing data portability. We developed a GT-seq panel for individual identification of black bears using …

Sustainable Approaches For Water Remediation And Soil Amendment, Hashani Abeysinghe Herath Mudiyanselage

Theses and Dissertations

Hydrosphere decontamination and sustainable agriculture are economic, health, and environmental concerns. Conventional non-destructive and destructive water treatment methods, and fertilizer formulations, can be expensive or ineffective. Biochar-nutrient composites have gained global acceptance as adsorbents or soil additives due to biochar’s modifiable surfaces, enabling enhanced performance and environmental benefits. This dissertation studied sustainable methods for removal of aqueous arsenic(V) by adsorption and destruction of per- and polyfluoroalkyl substances (PFASs) in liquid ammonia by defluorination and fertilizing phosphorus-deficient soil. Chapter II focuses on the surface morphological and physicochemical changes in alkali-exposed microparticulate magnetite-deposited rice husk (RH) biochar (Fe3O4@RHBC) relative to its pristine …

Analyzing The Relationship Between Financial And Real Estate Investment And Agricultural Land Values., Hudu Abukari

Theses and Dissertations

Using agricultural transaction data from 2019 to the first quarter of 2023 provided by a major financial lender in Mississippi, I assess the relationship between financial and real estate buyers and agricultural land prices. Grantor and grantee information in the data allowed me to classify buyers into individuals, non-individual agribusinesses, and financial and real estate buyers. A hedonic pricing model is used to explore the relationship. The study concluded that the buyer type of agricultural land matters. More specifically, financial and real estate buyers pay a premium more than individuals and agribusiness buyers.

Optimization Of Punicalagin-Releasing In Situ Forming Microparticles (Prism) For Treatment Of Osteoarthritis, J. Alejandra Amaya

Theses and Dissertations

Osteoarthritis (OA) is characterized by inflammation and degradation of articular cartilage, of which disease-modifying therapies are limited. Punicalagin (PUN), a polyphenol with cartilage-protective and anti-inflammatory properties, has inhibitory effects on matrix metalloproteinase-13 and pro-inflammatory cytokines. This study aims to optimize formulation of punicalagin-releasing in situ forming microparticles (PRISM) by varying polymer concentration, polymer ratio, solvent ratio, and oil-to-polymer ratio. Design of Experiment (DoE) software was used to generate 25 formulations. PRISM was created by emulsifying the polymer/drug solutions in sesame oil. Drug release data was measured via optical absorption readings and particle size determined by both scanning electron microscope (SEM) …