Digital Commons Network^™

Adversarial Machine Learning: Methods For Attacks And Defenses, Minh Hao Van

Graduate Theses and Dissertations

With the rapid development of machine learning in real-world applications, enhancing security plays an important role. Adversarial machine learning focuses on understanding malicious actions from attackers and developing defensive techniques against such threats when deploying machine learning systems. An attack can occur in different scenarios, such as poisoning attacks during the training stage and evasion attacks during the testing stage. Although extensive research has explored defense strategies to deal with these harmful attacks, there is a need for further research into areas such as how to counteract malicious attacks with healthy noise or how to train an adaptive defense against …

Penny For Your Thoughts: Exploring Mechanisms Linking Socioeconomic Status And Cognition, Colton Hunter

Graduate Theses and Dissertations

Socioeconomic status is a complex psychological construct linked to a number of professional and personal barriers, including cognitive deficits. Throughout this dissertation, I seek to examine the mechanisms that link socioeconomic status and cognition. First, I explore potential mediators in the link between adolescent family income and cognition in adulthood, identifying education, stressful life events, inflammation, and family education expectations as significant mediators. Next, I examine the effects of writing-based stress manipulations on long-term memory and working memory, as these effects may mimic stress from financial worry. In doing so, I identify potential effects on working memory parameters. Finally, in …

The Future Of Fashion: A Systematic Literature Review On Consumer Willingness To Pay For Green Apparel, Emma Clark

Graduate Theses and Dissertations

In recent years, consumers have become highly aware of the environmental impact of their purchases, specifically of apparel products. Accordingly, apparel brands have increasingly focused on enhancing the sustainability of their product offerings to attract environmentally conscious consumers and elevate their brand image (Dangelico et al., 2022). Furthermore, most sustainably produced products are priced higher for consumers compared to standard alternatives (Elmanadily & El-Deeb, 2022). Research has shown that consumers can accept higher prices for products that do less harm to the environment (Gomes et al., 2023), but it has yet to be determined in which cases this is consistently …

Koszul Cohomology Of Canonical Products, Alexander Scott Duncan

Graduate Theses and Dissertations

In this thesis, we give a complete classification of the Koszul cohomology groups K_p,₁(C, B, ω_C ⊗ B) on a smooth curve C of genus g ≥ 2 with B p-very ample. Such a classification in the case B = ω_C has been incomplete until [5]. The classification follows easily from our main result which precisely calculates K_p,1(C, B, B ω_C ⊗ B) in terms of h⁰(C, B). This result also handles the case B = ω_C. A straightforward …

Regulatory Compliance Standards And Power System Reliability: A Study On Inverter-Based Resources, Pirouz Honarmand

Graduate Theses and Dissertations

The increasing penetration of renewable energy, particularly inverter-based resources (IBRs), has reshaped the dynamics of modern power systems. This thesis investigates the impact of regulatory compliance, especially frequency ride-through requirements under NERC PRC-029-1, on the performance and reliability of interconnected multi-area systems. Using a MATLAB/Simulink-based state-space model built on the foundational structure proposed by Murty [31] and augmented with advanced control methods such as Linear Quadratic Regulator (LQR) control from Mackey and McCann [32] and further refined in the context of IBR damping by Alsarray and McCann [33], we explore three configurations of a three-area load frequency control (LFC) system. …

Atomic Level Characterization For The Transport Cycle Conformational Pathways Of Multidrug Resistance Protein 1 (Mrp1), Samuel Wamwere Mwatha

Graduate Theses and Dissertations

The multidrug resistance-associated protein 1 (MRP1/ABCC1) is an ATP-binding cassette (ABC) transporter that mediates the cellular efflux of endogenous and xenobiotic substrates, including therapeutic drugs. Its overexpression is a major contributor to multidrug resistance in cancer, which tends to result in negative clinical results. Even with considerable progress made in structural biology, the intricate details of how membrane lipid composition affects the conformational changes and functional switches of MRP1 still lack explanation.

This thesis employs long-timescale, all-atom molecular dynamics (MD) simulations to study the influence of various lipids on MRP1 lipid bilayer environments. Both inward-facing and outward-facing conformations of MRP1 …

Impact Of Smartphone Usage On The Performance And Satisfaction Of Hospitality Employees, Karalee Anne Taves

Graduate Theses and Dissertations

This study examined the impact of smartphone usage on the job outcomes (job satisfaction and performance) of employees, specifically focused on the hospitality industry, where employees’ income and performance heavily rely on emotional labor. The research was aimed to distinguish between negative smartphone activities (e.g., doomscrolling, social comparison) and positive activities (e.g., listening to calming music, engaging in stimulating games) to determine how these behaviors affect employees. Using the Stimulus, Organism, Response Cognitive Theory (SOR), the study examined if positive smartphone usage enhances well-being and job outcomes, while negative usage diminishes them. The results revealed that smartphone usage does not …

Rotation Errors Due To Field Quantization For Simultaneously Driven Atoms, Hunter Lindemann

Graduate Theses and Dissertations

If we want to physically implement qubits by using two level atoms within a cavity, then certain single-qubit gates (such as the X-gate) can be performed by bathing the atoms in an electromagnetic field from a laser. If the average photon count n̄ of the field greatly exceeds the number of N qubits, then the slight fluctuations of the field's phase and amplitude are mostly negligible. However, such a strong field might require more energy than what is desirable for the setup. If a weaker field is used in which phase and amplitude fluctuations might be noticeable, then the …

Utility Of John Deere's See & Spray Ultimate In Southern U.S. Row Crops, Tristen Avent

Graduate Theses and Dissertations

Row crop producers across the southern United States are observing a boom in technological advancement to improve operational efficiency. Additionally, environmental concerns and reduced profit margins drive the adoption of targeted pesticide application technologies like the John Deere See & Spray. This technology is relatively new, introduced in 2022, and producers need more insight into the shortcomings, potential herbicide savings, and the economic benefits of adoption. Since 2021, research has been conducted in Keiser, AR, with additional collaborative projects in Mississippi, North Carolina, Indiana, and Illinois. Five different objectives were addressed in this research: 1) to determine the impact of …

The Relationship Between Attention Deficit Hyperactivity Disorder And Problematic Internet Usage In Lgbtq+ Adults, Kayli Nicole Heigelmann

Graduate Theses and Dissertations

This thesis explores how LGBTQ+ adults who experience attention deficit hyperactivity disorder (ADHD) symptomology perceive and navigate potential problematic Internet usage (PIU). Utilizing a qualitative, phenomenological approach, twelve participants were interviewed to gain insight on how neurodivergence, queer identity, and Internet engagement intersect. Findings revealed two overarching themes: 1) the interplay between PIU, ADHD, and sexual/gender diversity, and 2) the meaning of the Internet for individuals with intersecting minority identities. Participants widely endorsed the Internet as an important space for identity negotiation, community, and affirmation for their multiple minority statuses, but acknowledged their vulnerability to the Internet’s attention-capturing mechanisms, reporting …

On And Off The Court: Who Am I?, Katie Claire Parker

Graduate Theses and Dissertations

From a very young age, athletically gifted individuals are encouraged to pursue their sport. This can lead to a strong maturity in an athletic sense, yet it comes at the expense of other areas of development. The early commitments to sport require the individual to make sacrifices that allow them to gain competency over others, as a result, additional values and identifying characteristics get pushed aside. Further, athletes are known for performing in the spotlight. Every game has an audience and one team ends up a winner, the other a loser. Typically, the athletes experience the highs of victory and …

Sanctuary Of The Voiceless: Examining Tik-Tok As A Political Landscape, Quentin Key

Graduate Theses and Dissertations

While studies of social media as a political landscape often focus on established platforms like Twitter. They neglect emerging spaces like TikTok, the short-form video app, which has become an unexpected hub for political discourse. This study test Melissa Harris-Perry's "everyday talk" framework to analyze the political utility of this new digital space. Through analysis of 271 posts across TikTok, Twitter/X, and Truth Social, the research reveals how platforms simultaneously enable and constrain political discourse. Findings show verified accounts post political content 3.2 times more often than regular users, while political posts receive 167% more reposts, demonstrating how algorithms amplify …

An Examination Of The Relationship Between Postsecondary Education And Earnings In The Architectural Woodworking Industry, Christopher J. Wernimont

Graduate Theses and Dissertations

The architectural woodworking industry offers a potential option to job seekers who are looking for alternatives to a formal 4-year postsecondary education. This preregistered quantitative study explores the relationship between postsecondary education and earnings for employees within the architectural woodworking industry. Framed by Human Capital Theory, the research investigates three questions: (1) do postsecondary credentials account for additional variance in income within the industry, (2) is the relationship between postsecondary education and income moderated by whether the credential is related to woodworking, and (3) do individuals with specific types of postsecondary credentials earn higher incomes than those without postsecondary credentials? …

Exploring The Relationship Between Novice Teacher Autonomy And Workplace Engagement, Burnout, And Intentions To Remain In The Teaching Profession, Bryce Bennett

Graduate Theses and Dissertations

Administrators and experienced faculty frequently disagree on the degree of autonomy that should exist for classroom teachers. Administrators seeking to make adjustments to the levels of autonomy experienced by their teachers may struggle to account for differences between novice teachers and their more seasoned counterparts. This study applies researched-based models for exploring the relationship between various job resources and demands and their ultimate impact on workers. A mixed method designed employing a survey across three large school districts in Arkansas asked participants questions intended to uncover the degree of autonomy novice teachers typically experience, levels of burnout & workplace engagement, …

Analog Low Dropout Regulator Design Within A 12nm Finfet Node, Harshdeep Singh

Graduate Theses and Dissertations

Modern ICs require the use of multiple voltage regulators to regulate power, this creates the need for analog low dropout regulator (LDO) designs in more advanced nodes such as for the 12nm FinFET process. Analog design is particularly challenging in FinFET processes due to a variety of factors, such as quantized parameters, large parasitic values and length of diffusion effects. An analog LDO was chosen for its improved power supply rejection ratio (PSRR) over digital and hybrid approach which is a key metric for voltage sensitive applications. The LDO was designed through an iterative approach to address the difficulty of …

Real-Time Anomaly Detection In Ot Networks Using Gru-Based Autoencoders, Grant Austin Wilkins

Graduate Theses and Dissertations

Operational Technology (OT) networks, particularly those used in critical infrastructure, face increasing cyber threats that target network-level protocols and behaviors. While most anomaly detection research for OT systems has traditionally relied on sensor data, this thesis explores the viability of detecting malicious activity directly from network telemetry. We propose a sequence-to-sequence autoencoder model based on Gated Recurrent Units (GRUs) with multilevel attention, trained to reconstruct normal patterns of packet-level communication extracted from raw PCAP data. The developed feature engineering pipeline integrates general networking attributes such as IP and MAC addresses, ports, and transport protocols with OT-specific protocol information from Modbus …

Women’S Participation In Homegrown And Domestic Terrorism Plots, Caroline Johnson

Graduate Theses and Dissertations

The 21^st century ushered in major social, political, and cultural changes in the United States, including a new era of homeland security and new forms of domestic terrorism. Little is known about how such shifts may have impacted women’s participation in terrorism plots. In response, data from the American Terrorism Study (ATS) are used to comparatively examine the involvement of women in homegrown and domestic terrorism plots before and after the 9/11 terrorist attacks. Findings of similarities and differences in women’s involvement in terrorism across time periods are presented and contextualized.

The Role Of Arkansas Rural Libraries In Cultural Capital Development, Callie Spear Embry

Graduate Theses and Dissertations

This study explores the role of rural public libraries in Arkansas in fostering cultural capital development among youth. By employing a mixed-methods approach combining quantitative analysis from the 2022 Arkansas Public Library Survey and qualitative insights gathered from semi-structured interviews with rural librarians, the research investigates three core questions: (1) How do rural libraries impact youth cultural capital development? (2) In what ways can these libraries enhance their effectiveness in this area? (3) How do librarians perceive their roles in this developmental process?

Findings indicate that rural libraries serve as pivotal cultural coordinators and community hubs, positively affecting youth engagement …

A Robust Rf Fingerprinting Approach Using Physics-Informed Neural Networks, Jozef Dusenka

Graduate Theses and Dissertations

Radio frequency (RF) fingerprints, caused by unique imperfections in communication hardware, offer a promising solution for zero-trust security. However, existing RF fingerprinting techniques, which aim to extract these signatures from transmitters to uniquely identify devices, often struggle with robustness in the face of temporal and spatial variations in real-world, time-varying wireless environments. For example, a neural network trained on RF signals collected on Day 1 can experience a significant performance drop when tested with data from Day 2.

To address this challenge, we propose a novel, robust RF fingerprinting method based on Physics-Informed Neural Networks (PINNs). Rather than training the …

The Role Of Mental And Physical Health On Fear Of Crime, Macky Ann Hurst

Graduate Theses and Dissertations

Fear of crime is a significant social issue that affects quality of life, often leading to behavioral changes and increased anxiety. While prior research has explored the link between fear of crime and health, notable gaps remain – particularly regarding how distinct dimensions of health influence fear of crime. This study addresses these gaps by examining the effects of perceived health and depressive symptoms on fear of crime. Data were drawn from the Arkansas Crime, Public Safety, and Health Survey (ACPSHS), an online, opt-in survey of approximately 2,300 non- institutionalized adults in Arkansas. Ordinary least squares regression models were used …

Guns, Policing, And Crime: How The Internet And Social Media Shape Public Opinions, Sophie Buckley

Graduate Theses and Dissertations

I aimed to understand whether and how use of the internet and social media shapes attitudes on gun control, policing, and general crime. I use elements of cultivation theory to explain how exposure to media content insights moral panics and influences public beliefs on issues like guns and policing. Data were drawn from the 2023 Pew Research Center National Public Opinion Reference Survey (N=4,713), an annual survey of United States adults to produce benchmark estimates for various topics. I hypothesized that data from the survey will show frequent social media and internet usage influences attitudes towards crime, policing, and guns. …

Comparisons Between Traditional And Gluten-Free Cookies In Sensory Attributes, Acceptance, And Evoked Emotions, Eniola Ola

Graduate Theses and Dissertations

The rise in food allergies and intolerances, notably conditions like Celiac disease, as well as a general shift of consumers to a more health-conscious lifestyle has significantly increased the demand for gluten-free products. Consumers increasingly seek gluten-free products, yet these alternatives often face challenges in replicating the sensory qualities of traditional gluten-containing foods. This study explores the sensory attributes, emotional responses, and labeling impacts on consumer perception of gluten-free and gluten-containing cookies. The main objective of this thesis was to address the gap in research on sensory evaluation of gluten free foods, specifically in terms of commercially available products. The …

The Rhetorical Use Of The Lower Classes In Three Primary Accounts Of The First Crusade, John Hannon

Graduate Theses and Dissertations

This study analyzes the rhetorical use of the lower classes in three primary accounts of the First Crusade: Albert of Aachen, the Gesta Francorum, and Raymond of Aguilers — specifically with an eye towards the proper maintenance of the order of society through everyone performing their assigned role. Through a close reading of these three texts this study demonstrates how the three authors engage with and uphold versions of the idealized three orders model of medieval society. Though there is nuance between each source, broadly, each of the authors presents the lower classes as a force that needs to …

Land Cover Effects On Stream Water Chemistry In The Upper Saline River Watershed, Brandy Everett

Graduate Theses and Dissertations

Non-point source (NPS) pollutants and the conversion of natural areas to anthropogenic uses are one of the most critical stressors on water quality. The Upper Saline River Watershed has seen an increase in anthropogenic land cover over the last two decades, leading it to be previously identified as a 319 NPS priority watershed in Arkansas. This study used publicly available data to assess the magnitude and trends of total nutrients (TN and TP) at both the watershed and site level scale. Results suggest a decrease of 2.6%/yr in TN concentrations and 1.5%/yr in TP concentrations at the watershed scale. While …

Assessing The Effect Of Material Properties On Full Depth Reclamation (Fdr) Mixtures Via Compressive Strength Characterization, Toluwanimi Ogundipe

Graduate Theses and Dissertations

Enormous amounts of money to replace all poorly maintained roads with brand new construction or with rehabilitation options like the mill and overlay which neglects the address of underlying pavement issues. To reduce the cost intensity of new construction of dilapidated pavements, state departments of transportation are seeking cost-effective techniques to rehabilitate roads. One of the techniques that have been explored and implemented by state DOTs is full-depth reclamation. Full depth reclamation (FDR) as a pavement rehabilitation technique is the reclaiming and recycling of an existing pavement with a predetermined amount of existing base layer. The combination of the reclaimed …

Advanced Numerical Techniques For Multiscale Simulations In Biofluid Dynamics, Justin Tamico Jack

Graduate Theses and Dissertations

The study of anisometric particle suspensions and congenital heart defects (CHDs) involve exploring complex phenomena within the biological sciences. The former subject dives into the phase behavior of liquid crystals (LCs), particularly the influence of the shape anisotropy of rod-like nanoparticles on phase transitions, through the implementation of statistical techniques involving molecular dynamics (MD). Conversely, the latter topic focuses on the assessment and management of severe congenital arterial stenoses, such as those found in Williams-Beuren syndrome (WS), through advanced multi-scale computational fluid dynamics (CFD) simulations. Both areas emphasize the importance of detailed analysis and the use of advanced numerical modeling …

Paste Properties, Hardened Concrete Properties, And Mix Design Process For Magnesium Phosphate Cement, Rilye Dillard

Graduate Theses and Dissertations

Magnesium phosphate cement (MPC) is a rapid-setting alternative cement typically used as a quick repair material. MPC has gained popularity in recent years due to its ability to reduce CO2 emissions, its strong chemical resistance, and potential use in large scale applications. There is currently limited research on the properties of MPC when varying the proportions of its ingredients. Several hardened concrete properties were analyzed on concrete mixtures made with MPC. A mix design process for MPC concrete is proposed based on testing of 300 MPC paste mixtures and 115 MPC concrete mixtures. A standardized mix design process is imperative …

Bactericidal Mechanism Of Peracetic Acid Against Salmonella Mediated By Reactive Oxygen Species, Mohammed Khalid Wheib Al-Doury

Graduate Theses and Dissertations

Peracetic acid (PAA) is extensively used as a bactericidal agent in poultry processing to reduce foodborne pathogens, including Salmonella enterica serotype Typhimurium (S. Typhimurium). Despite its widespread application, the exact mechanisms underlying its bactericidal effects, particularly the role of reactive oxygen species (ROS), remain incompletely understood. This dissertation examines the role of ROS in PAA-mediated bacterial killing and explores both genetic and metabolic factors that influence bacterial susceptibility to PAA. Findings from these studies have implications for enhancing the efficacy of PAA, thereby improving food safety practices in the industry.

The first study investigates ROS as a central component …

Learning To Accelerate Globally Optimal Solutions: Applications In The Ac Optimal Power Flow Problem, Muhammet Fatih Cengil

Graduate Theses and Dissertations

The Alternating Current Optimal Power Flow (AC-OPF) problem is a fundamental optimization challenge critical to ensuring the economical and reliable operation of power grids. While fast heuristic methods provide upper-bound solutions, assessing their quality requires lower bounds obtained from relaxations of the AC-OPF problem. This dissertation focuses on finding globally optimal solutions to the AC-OPF problem by enhancing the effectiveness and efficiency of Quadratic Convex (QC) relaxations. Leveraging machine learning techniques, we aim to achieve tighter relaxations faster and improve computational performance, enabling practical scalability for real-time applications.

In Chapter 2, we propose a machine learning-based method to accelerate the …

An Analysis Of Policies, Practices, And Barriers To Create A Multi-Dimensional Approach To Renewable Energy Transition For Us Communities, Hanan Wehbi

Graduate Theses and Dissertations

The transition from fossil fuel-derived energy resources to clean, renewable, affordable, and reliable energy necessitates a comprehensive approach. This approach must incorporate an interdisciplinary contribution to ensure the sustainability, efficiency, and resilience of the energy system. In the United States, many communities and local governments are developing ambitious plans, regulations, and targets to support the renewable energy transition and enhance energy efficiency. This research builds on the principles of sustainable development planning and transition theory to develop a framework that assists communities in planning their renewable energy (RE) transition and integrate these plans in their long- and short-term development approaches. …