Digital Commons Network^™

Experimental And Analysis Of Electromagnetic Characterization Of Biological And Non-Biological Materials In Microwave, Millimeter-Wave, And Terahertz Frequency Bands, Nagma Vohra

Graduate Theses and Dissertations

The goal of this research is to characterize the electromagnetic properties of biological and non-biological materials at terahertz (THz), millimeter-wave, and microwave frequency bands. The biological specimens are measured using the THz imaging and spectroscopy system, whereas the non-biological materials are measured using the microwave and millimeter-wave free-space system. These facilities are located in the Engineering Research Center at the University of Arkansas. The THz imaging system (TPS 3000) uses a Ti-Sapphire laser directed on the photoconductive antennas to generate a THz time domain pulse. Upon using the Fourier Transform, the spectrum of the pulsed THz signal includes frequencies from …

Resilience-Driven Post-Disruption Restoration Of Interdependent Critical Infrastructure Systems Under Uncertainty: Modeling, Risk-Averse Optimization, And Solution Approaches, Basem A. Alkhaleel

Graduate Theses and Dissertations

Critical infrastructure networks (CINs) are the backbone of modern societies, which depend on their continuous and proper functioning. Such infrastructure networks are subjected to different types of inevitable disruptive events which could affect their performance unpredictably and have direct socioeconomic consequences. Therefore, planning for disruptions to CINs has recently shifted from emphasizing pre-disruption phases of prevention and protection to post-disruption studies investigating the ability of critical infrastructures (CIs) to withstand disruptions and recover timely from them. However, post-disruption restoration planning often faces uncertainties associated with the required repair tasks and the accessibility of the underlying transportation network. Such challenges are …

Design And Development Of Techniques To Ensure Integrity In Fog Computing Based Databases, Abdulwahab Fahad S. Alazeb

Graduate Theses and Dissertations

The advancement of information technology in coming years will bring significant changes to the way sensitive data is processed. But the volume of generated data is rapidly growing worldwide. Technologies such as cloud computing, fog computing, and the Internet of things (IoT) will offer business service providers and consumers opportunities to obtain effective and efficient services as well as enhance their experiences and services; increased availability and higher-quality services via real-time data processing augment the potential for technology to add value to everyday experiences. This improves human life quality and easiness. As promising as these technological innovations, they are prone …

Overcoming Learning Anxiety In Workplace Learning: A Study Of Best Practices And Training Accommodations That Improve Workplace Learning, Ann-Marie Piscitelli

Graduate Theses and Dissertations

Anxiety disorders are the most common mental illness in the U.S. and affect 40 million adults, or 18.1% of the population each year. Anxiety plays an essential role in encouraging productive learning outcomes; however, uncontrolled anxiety could result in heightened emotions that create barriers to learning. Employees who have anxiety disorders may experience these barriers to learning when in traditional training programs and may require support or accommodations to boost their unique learning needs for development in the workplace. Human Resource Development (HRD) professionals’ challenge is how best to intervene when an employee exhibits behaviors of learning anxiety to nurture …

An Automated Method To Enrich And Expand Consumer Health Vocabularies Using Glove Word Embeddings, Mohammed Ibrahim

Graduate Theses and Dissertations

Clear language makes communication easier between any two parties. However, a layman may have difficulty communicating with a professional due to not understanding the specialized terms common to the domain. In healthcare, it is rare to find a layman knowledgeable in medical jargon, which can lead to poor understanding of their condition and/or treatment. To bridge this gap, several professional vocabularies and ontologies have been created to map laymen medical terms to professional medical terms and vice versa. Many of the presented vocabularies are built manually or semi-automatically requiring large investments of time and human effort and consequently the slow …

Analyzing The Mediating Effects Of Social Capital And Sense Of Community Between International Student’S College Sports Fan Identification And Acculturation, Kibaek Kim

Graduate Theses and Dissertations

According to the number provided by the International Institute of Education (IIE), there are over one million international students enrolled in the United States. Although the number of international students is increasing, the incremental rate started to decrease after reaching its peak in the 2017-2018 academic year. While previous studies focused on the role of leisure activities, such as physical activity participation, to analyze how international students can receive social support from their communities to better acculturate in the U.S., this study focused on the role of spectator sports on providing social support and its effect on international student’s acculturation. …

Promoting Diversity In Academic Research Communities Through Multivariate Expert Recommendation, Omar Salman

Graduate Theses and Dissertations

Expert recommendation is the process of identifying individuals who have the appropriate knowledge and skills to achieve a specific task. It has been widely used in the educational environment mainly in the hiring process, paper-reviewer assignment, and assembling conference program committees. In this research, we highlight the problem of diversity and fair representation of underrepresented groups in expertise recommendation, factors that current expertise recommendation systems rarely consider. We introduce a novel way to model experts in academia by considering demographic attributes in addition to skills. We use the h-index score to quantify skills for a researcher and we identify five …

Efficiently Estimating Survival Signature And Two-Terminal Reliability Of Heterogeneous Networks Through Multi-Objective Optimization, Daniel Bruno Lopes Da Silva

Graduate Theses and Dissertations

The two-terminal reliability problem is a classical reliability problem with applications in wired and wireless communication networks, electronic circuit design, computer networks, and electrical power distribution, among other systems. However, the two-terminal reliability problem is among the hardest combinatorial problems and is intractable for large, complex networks. Several exact methods to solve the two-terminal reliability problem have been proposed since the 1960s, but they have exponential time complexity in general. Hence, practical studies involving large network-type systems resort to approximation methods to estimate the system's reliability. One attractive approach for quantifying the reliability of complex systems is to use signatures, …

Using Transcendental Phenomenology To Explore Elementary Teachers’ Experiences With Struggling Readers During The Social Restrictions Precipitated By The Covid-19 Pandemic, Wyann C. Stanton

Graduate Theses and Dissertations

This study provides a window into the experiences of elementary teachers with their struggling readers during the largest world-wide interruption to education that has ever been seen. This study gives insight to educational leaders and educators as they assist their struggling readers in rebounding from the disruption to school caused by the COVID-19 pandemic and as they work to improve the quality of schooling for struggling readers. Since the beginning of the pandemic, there had been a growing body of educational literature in pandemic-related information, practice, and research. Yet, there was a need to bring to light the phenomenon of …

Effect Of Harvest Time On The Incidence Of Red Drupelet Reversion And Development Of Tetraploid Linkage Maps In Blackberry, Mitchell E. Armour

Graduate Theses and Dissertations

The cultivated eastern U.S. blackberry (Rubus L. subgenus Rubus Watson) has gone through tremendous strides in both trait improvement and market outreach at the University of Arkansas System Division of Agriculture (UA System). What began as primarily a pick-your-own local fruit found mostly in the wild, has become a commercialized year-round product in most major U.S. grocery retailers. This could not have been achieved without decades of diligent breeding efforts. Although the genetic improvement of fresh-market blackberries has advanced, there are still issues that need to be addressed. One issue is the prevalence of red drupelet reversion (RDR), a physiological …

The Post-Observation Conference: An Exploration Of Feedback Strategies, Dennis M. Fare

Graduate Theses and Dissertations

The post-observation conference is valuable, dedicated time for a teacher to focus their discussion on their own instruction and instructional delivery. This experience serves as an opportunity for the teacher to review the details of a lesson with their observer, while also reflecting on teaching practices. Not only does the post-observation provide the teacher with accolades regarding their teaching performance, but it is also an exchange where the teacher can reflect and is provided with critical feedback to improve instructional execution moving forward. The purpose of this qualitative study is to explore those strategies and conditions that prompt teachers to …

Automated Privacy Protection For Mobile Device Users And Bystanders In Public Spaces, David Darling

Graduate Theses and Dissertations

As smartphones have gained popularity over recent years, they have provided usersconvenient access to services and integrated sensors that were previously only available through larger, stationary computing devices. This trend of ubiquitous, mobile devices provides unparalleled convenience and productivity for users who wish to perform everyday actions such as taking photos, participating in social media, reading emails, or checking online banking transactions. However, the increasing use of mobile devices in public spaces by users has negative implications for their own privacy and, in some cases, that of bystanders around them.

Specifically, digital photography trends in public have negative implications for …

On The Epistemic Significance Of Expert Conversion, Dax R. Bennington

Graduate Theses and Dissertations

Much of our knowledge of the world depends on the testimony of experts. Experts sometimes change their minds and disagree with each other. What ought a novice do when an expert changes their mind? This dissertation provides an account of when expert conversion is epistemically significant and how the novice ought to rationally defer to expert conversion. In answering when expert conversion is epistemically significant, I provide a diagnostic tool that emphasizes that epistemically significant expert conversion seems to be evidence-based and that there is an absence of cognitive biases on the part of the converting expert. In answering how …

Fabrication And Characterization Of Photodetector Devices Based On Nanostructured Materials: Graphene And Colloidal Nanocrystals, Wafaa Gebril

Graduate Theses and Dissertations

Photodetectors are devices that capture light signals and convert them into electrical signals. High performance photodetectors are in demand in a variety of applications, such as optical communication, security, and environmental monitoring. Among many appealing nanomaterials for novel photodetection devices, graphene and semiconductor colloidal nanocrystals are promising candidates because of their desirable and unique properties compared to conventional materials.

Photodetector devices based on different types of nanostructured materials including graphene and colloidal nanocrystals were investigated. First, graphene layers were mechanically exfoliated and characterized for device fabrication. Self-powered few layers graphene phototransistors were studied. At zero drain voltage bias and room …

Grid Strength Assessment Trough Q-V Modal Analysis And Maximum Loadability Of A Wind-Dominated Power System Using P-Q Regions, Pierre Obed Dorile

Graduate Theses and Dissertations

Climate change is a menace to the existence of the world and policymakers are trying totackle this phenomenon by deploying large-scale wind farms into their grids. Among them, wind energy shows a promising future to substitute the traditional power plants. However, the deployment of these wind farms into the grid is not a panacea that does not pose any challenges to the grid operators. Keeping the power system voltage stable while considering the strength of the transmission grid is among the major challenges facing by the transmission system operators. Amid normal operation and fault conditions, wind farms should help the …

The First Sign: Detecting Future Financial Fraud From The Ipo Prospectus, Lisa Spadaccini Anderson

Graduate Theses and Dissertations

In this study, I examine whether it is possible to predict future financial statement fraud using disclosure content prior to the fraud. Specifically, I employ a machine learning algorithm to construct a unique measure based on the lexical cues embedded within a firm’s first public disclosure, the Management’s Discussion and Analysis section of the S-1 filing, during the Initial Public Offering process. I use this measure to predict whether a firm that is not already committing fraud will commit fraud within five years of the Initial Public Offering (IPO) that results in an Accounting or Enforcement Release (AAER). I find …

Oklahoma Public Comprehensive Universities: The President's Role In Financial Management And Fundraising, Mark Bradley Shields

Graduate Theses and Dissertations

Oklahoma public comprehensive university presidents face many challenges. Among the top challenges is the quest for adequate funding of their institutions, including adequate levels of support from state resources. For Oklahoma’s public comprehensive universities and their leaders, the low levels of public support by the state have become a pattern, rather than an anomaly. The statewide reductions in appropriations for higher education funding have had a disproportionate effect on Oklahoma’s public comprehensive universities because they have fewer diversified revenue sources. As a result, Oklahoma public comprehensive university presidents have been forced to become more adept at budgeting, financial management, fundraising, …

Combating Conspiracy Theories: An Attitudes-Based Approach, Marie Altgilbers

Graduate Theses and Dissertations

The prevalence of conspiracy theories is a topic of increasing concern among researchers. Much of the research in this area has been focused on why people endorse conspiracy theories, and relatively little attention has been paid to how they may be mitigated. What research has been done focused primarily on interventions with arguments based in cognitive, fact-based appeals, with mixed success. The present research draws on findings from the attitudes and persuasion literature to test the hypothesis that conspiracy theory endorsement is more effectively reduced by affectively-based arguments than by cognitively-based arguments. Two affectively-based interventions were tested against a cognitively-based …

Development Of A Reference Design For Intrusion Detection Using Neural Networks For A Smart Inverter, Ammar Mohammad Khan

Graduate Theses and Dissertations

The purpose of this thesis is to develop a reference design for a base level implementation of an intrusion detection module using artificial neural networks that is deployed onto an inverter and runs on live data for cybersecurity purposes, leveraging the latest deep learning algorithms and tools. Cybersecurity in the smart grid industry focuses on maintaining optimal standards of security in the system and a key component of this is being able to detect cyberattacks. Although researchers and engineers aim to design such devices with embedded security, attacks can and do still occur. The foundation for eventually mitigating these attacks …

Reference Design Of An Online Emulation And Hot-Patching Approach For Power Electronic Controller Validation, Estefano Soria Pearson

Graduate Theses and Dissertations

This thesis aims to develop a reference design of an online security system approach embedded in a power electronic controller for cybersecurity purposes. Cybersecurity in power electronics focuses on reducing vulnerabilities in the system, where most reside in the communication with the hardware devices. Although methods to secure communications lessen the probability and effects of cyber-attacks, discovering vulnerabilities is inevitable. This thesis attempts to provide a fail-safe approach to securing the system by targeting the safety of the power-electronic controller. This approach applies an additional security layer in case of a malicious or accidental controller firmware malfunction.

The online security …

Live The Local: Exploring The Relationship Between Local News Media And Cities Undergoing Downtown Revitalization, Allison Wise

Graduate Theses and Dissertations

The rise in suburban development has caused many downtowns across the United States to lose residents, businesses, attractions and community engagement. City officials and planners work to create policies, designs and urban development that help to revitalize downtowns. However, how do we bring people into our downtowns to live, work and play? That is where local news coverage can have an impact. The question arises: What can city officials, event organizers, business leaders do to foster a vibrant downtown? News outlets (e.g., television, print, digital) and their corresponding social media platforms, such as Facebook and Twitter, can act as " …

Investigation Of Membrane Based Processes For Biomedical Applications, Efecan Pakkaner

Graduate Theses and Dissertations

As substantial developments were achieved in nanotechnology and polymer engineering, especially in the last few decades, the use of membranes and membrane-based procedures was found to be expanding into more and more research and development areas; including biological engineering, life sciences and biomedical engineering. Not only have they been the main focus of meaningful research, but they have also been the main pieces of the solutions to very thorny problems encountered within a wide range of applications from microfluidics to water treatment, thanks to their versatility, cost-effectiveness and biocompatibility, when compared to conventional separation techniques. To celebrate and embrace these …

Weather Permitting, Acadia Kandora

Graduate Theses and Dissertations

Weather Permitting is an exhibition of objects and printed matter, primarily in the form of publicationsthat examine my relationship to nature and the idea of nature as both sanctuary and armor. At a young age, my parents would take my on a hike every Sunday instead of going to church. The hikes acted as a weekly pilgrimage deep into the woods and a ritual instilling the idea of nature being a place of spiritual refuge and retreat. A sanctuary - of course, weather permitting.

As I grew up and experienced hardship, my first instinct has always been to go hide …

In Search Of Ourselves, We Find Each Other, Kalyn Fay Barnoski

Graduate Theses and Dissertations

in search of ourselves, we find each other is a fully collaborative, multi-platform exhibit centered on developing and locating relationships to both self and community. Challenging societal individualism, the exhibit focuses on collective, relational creativity using Indigenous methodologies for community. It is about me. It is about you. It is about us.

Heartwork, Lance Taylor Loftin

Graduate Theses and Dissertations

Heartwork is a collection of paintings, drawings, and sculptures that explore the many ways identity is shaped by familial histories and personal memory. Focusing on my time growing up on a pine tree farm in Jackson, Mississippi in the early 90s, Heartwork explores gender, religion, regional traditions, family, and art. Through conversations and collaborations with my family, painting acts as an impetus for strengthening relationships. By reevaluating the past, I am able to create a web of interconnected narratives that inform and shift my understanding of the present.

Made Of Water, Covered In Mud, Nicole Norman

Graduate Theses and Dissertations

My fixation on water as metaphor is a product of my cosmic design; Scorpio sun, Pisces moon, Pisces rising. I am made of water, begging to be held. Anything liquid has this same desire. I use my art practice to examine the fluidity of physical and digital spaces; how they transform almost constantly. This is only possible through the use of containers that give form to abstract ideas and make them easier to drink (read: digest). Containers can vary in size and shape, but their purpose remains the same. A drinking glass, a swimming pool, a creek bed. These are …

What's Going On Here, Joanna R. Pike

Graduate Theses and Dissertations

This project is an installation depicting shirts and pants in various degrees of Recognizability. The Components vary from somewhat Unrecognizable to entirely Unrecognizable; Bumps and Blocks are interspersed and interrupt the Semi-logic of What’s going on here while adding repetitive elements to clarify the existence of the Semi-logic. The arrangement of the Components in the installation makes the Unrecognizable forms surrounded by the In-between Space into somewhat Recognizable versions of shirts and pants. The viewer does not fully recognize all the Components, but instead understands the implied Recognition given their existence within the installation. The ideas of Lists, Patterns, Systems, …

Survey Of Ticks And Tick-Borne Pathogens Associated With Feral Swine (Sus Scrofa) In Arkansas, Haylee Campbell

Graduate Theses and Dissertations

Feral hogs (Sus scrofa L.) are an invasive species throughout the southeast United States and found in every Arkansas county. As feral hogs invade new habitat, they can disrupt ecosystems, damage agriculture systems, and bring ticks and tick-borne pathogens with them. There are no surveys of the tick species parasitizing the Arkansas feral hog populations or the pathogens they carry. This is a public health concern because feral hogs occupy often same geographical regions as humans and livestock and can harbor over 45 animal diseases and parasites. The ticks carried by feral hogs can carry tick-borne pathogens that can cause …

In-Between Spaces, Trinity Kai

Graduate Theses and Dissertations

In-between Spaces is a paper based in personal narrative that uses Critical Race Theory and art to analyze the history of photography and systems of discrimination facilitated by hegemonic culture. Body is at the center as a symbol of the physical and psychological impacts systemic inequalities have on people that are classified as other and how one can be absent and present in institutional and public spaces.

Molecular And Genetic Studies Of Robo2 Transcriptional Regulation In The Central Nervous System Of Drosophila Melanogaster, Muna Abdal Rahim Abdal Rhida

Graduate Theses and Dissertations

Drosophila Robo2 axon guidance receptor is a member of the evolutionarily conserved Roundabout (Robo) protein family that is involved in directing axons that cross the midline to the other side of the animal body. Robo2 roles mainly depend on two factors: The functional domains of the Robo2 protein, which is extensively studied, and the dynamic transcription of robo2 in various subsets of cells throughout embryogenesis which is not fully understood. Thus, knowing robo2 enhancers that transcriptionally regulate robo2 during embryogenesis is significant. To investigate robo2 potential enhancers, we screened 17 transgenic lines of Drosophila that were generated by Janelia Research …