Digital Commons Network^™

Variation-Aware Non-Linear Mapping For Honey-Memristor Based Neuromorphic System, Harshvardhan Uppaluru, Md Mehedi Hasan Tanim, Md Omar Faruque, Mohammed Rafeeq Khan, Zoe Templin, Feng Zhao, Jinhui Wang

Electrical and Computer Engineering Faculty Research & Creative Works

Natural organic memristors are promising synapse candidates for neuromorphic systems due to their significant benefits, such as environmental sustainability, low production and disposal cost, non-volatile storage capability, and bio/CMOS-compatibility. In this paper, experimental evaluations of a neuromorphic system based on honey-memristors are reported. First, honey-memristors are manufactured and tested based on our in-house technology, and then the non-linear characteristics inherent to honey-memristors, which causes inaccurate weight updates and reduces the inference accuracy, are explored. A non-linear mapping (NMP) method is applied to mitigate the effects of non-linearity in honey-memristor, under different scenarios including multiple cycle-to-cycle variations and Analog-to-Digital Converter (ADC) …

Can Micro-Expressions Be Used As A Biomarker For Autism Spectrum Disorder, Mindi Ruan, Na Zhang, Xiangxu Yu, Wenqi Li, Chuanbo Hu, Paula J Webster, Lynn K Paul, Shuo Wang, Xin Li

2020-Current year OA Pubs

INTRODUCTION: Early and accurate diagnosis of autism spectrum disorder (ASD) is crucial for effective intervention, yet it remains a significant challenge due to its complexity and variability. Micro-expressions are rapid, involuntary facial movements indicative of underlying emotional states. It is unknown whether micro-expression can serve as a valid bio-marker for ASD diagnosis.

METHODS: This study introduces a novel machine-learning (ML) framework that advances ASD diagnostics by focusing on facial micro-expressions. We applied cutting-edge algorithms to detect and analyze these micro-expressions from video data, aiming to identify distinctive patterns that could differentiate individuals with ASD from typically developing peers. Our computational …

Social Relationships, Amyloid Burden, And Dementia: The Aric-Pet Study, Renée C Groechel, Albert C Liu, Chelsea Liu, David S Knopman, Silvia Koton, Anna M Kucharska-Newton, Pamela L Lutsey, Thomas H Mosley, Priya Palta, A Richey Sharrett, Keenan A Walker, Dean F Wong, Rebecca F Gottesman

2020-Current year OA Pubs

INTRODUCTION: This study aimed to assess whether social relationships in mid-life reduce the risk of dementia related to amyloid burden.

METHODS: Participants in the Atherosclerosis Risk in Communities (ARIC) study were assessed for social support and isolation (visit 2; 1990-1992). A composite measure, "social relationships," was generated. Brain amyloid was evaluated with florbetapir positron emission tomography (PET); (visit 5; 2012-2014). Incident dementia cases were identified following visit 5 through 2019 using ongoing surveillance. Relative contributions of mid-life social relationships and elevated brain amyloid to incident dementia were evaluated with Cox regression models.

RESULTS: Among 310 participants without dementia, strong mid-life …

Ai Trustworthy: Ethical Challenges And Strategies, Jian Liu, Iwan Sandjaja, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

This paper explores the pivotal role of trust in the widespread application of Artificial Intelligence (AI) across various domains. We review AI applications in sectors like energy, healthcare, and autonomous vehicles and discuss the crisis of human trust they face. This paper introduces a novel framework that delineates the relationship between AI transparency and user trust, highlighting specific industry applications. Through a systematic review of recent literature, we first delve into factors such as emotional response, acceptance, transparency, accuracy, and interpretability that shape human trust in AI. We then underscore the necessity of ethical AI practices and highlight the importance …

At-Risk Children: Adult Perception And Recognition Of Mental Health Concerns, Abby D. Lucas

College of Graduate Studies: Theses & Dissertations

Approximately 20% of children ages nine to 17 in the United States struggle with mental health concerns each year (Gamm et al., 2010). Early identification of child and adolescent mental health concerns is crucial for initiating treatment to prevent recurrence or persistence of pathology into adulthood (Logan & King, 2001). Children are primarily dependent upon adults in their lives (e.g., parents/caregivers, education professionals, healthcare providers) to recognize mental health concerns and seek services (Sayal et al., 2010). Providing these adults with guidance on how to appropriately identify and recognize these mental health needs in children is critical (Crouch et al., …

Development Of A Measure Assessing Adolescent Aggression: The Aggressive Behavior Risk Assessment- Adolescent- Parent Report (Abra-A-Pr), Katherine Fallon

College of Graduate Studies: Theses & Dissertations

Although parent-report scales for general behavioral difficulties and aggression (e.g., verbal and physical aggression) exist, there are currently no measures assessing sexual behaviors in this context. Commonly, parent-report measures provide a few items relevant to behavioral aggression, and items encompassing sexually aggressive behaviors are frequently vague and non-specific in the actions being committed by the adolescent. The primary purpose of this project was to develop a comprehensive and multifaceted parent-report measure for aggressive behavior in adolescents. Three separate studies were conducted to evaluate the psychometric properties of the measure. Exploratory (EFA) and confirmatory factor analysis (CFA) were used to investigate …

Social Support In Black Individuals: The Moderating Effects On The Relationship Between Resilience And Well-Being, Imani Elise Crosby

College of Graduate Studies: Theses & Dissertations

Black individuals possess numerous strengths and positive contributions that build strong communities and cultivate psychological well-being (Biglan et al., 2012). However, much of the current literature focuses on hardships Black individuals face, skewing the larger discourse of their lived experience. This exclusive focus on adversity often neglects pathways by which Black people thrive and flourish. It is important to consider how Black experiences relate to a sense of well-being. Resilience, or the ability to “bounce back” from adverse experiences is linked well-being outcomes (APA, 2012). However, it is unknown whether the promotive effects of resilience directly contribute to well-being outcomes …

Psychotherapist Awareness And Competence Managing Social Media Concerns, Jing Wen Ong

College of Graduate Studies: Theses & Dissertations

Social media use increased substantially in recent years, spurring the growth of research focused on its association with mental health. Previous research examined the relationship between positive and negative aspects of mental health and social media use. Other studies explored the relevance of social media to professional practice of psychologists including the use of social media to reach populations with limited access to mental health services and ethical dilemmas arising from social media use; however, there is limited understanding of the pertinence of social media to concerns that clients discuss in therapy and therapist competence in handling these discussions. The …

Enhancing Flight Delay Predictions Using Network Centrality Measures, Joseph Ajayi

College of Graduate Studies: Theses & Dissertations

Accurate prediction of flight delays remains a formidable challenge within the aviation industry, owing to its inherent complexity and the interconnectivity of its operations. Traditional flight prediction methods frequently utilize meteorological conditions—such as temperature, humidity, and dew point—alongside flight-specific data like departure and arrival times. However, these predictors often fall short of capturing the nuanced dynamics that lead to delays. This thesis introduces network centrality measures as novel predictors for enhancing the binary classification of flight arrival delays. Furthermore, it emphasizes the application of tree-based ensemble models, which are recognized for their superior ability to model complex relationships compared to …

The Effects Of Cultural Responsiveness And Therapy Duration On Black Americans’ Therapy Preference, Katilyn M. Ashley Treem

College of Graduate Studies: Theses & Dissertations

Marginalized groups are less likely to seek out mental health services than non-marginalized groups. There are various reasons why marginalized groups, such as Black Americans, are less likely to seek out mental health services, one of which is the cultural barriers between a clinician and client. Research suggests that Black Americans feel that clinicians struggle to overcome these cultural barriers. Therefore, it is important for clinicians to actively receive training on how to serve clients with diverse backgrounds. Cultural responsiveness, an extension from cultural competence, is the active application of the knowledge and skills obtained in training. Examining people’s therapy …

Screening H3 Histone Acetylation In A Wild Bird, The House Sparrow (Passer Domesticus), Daniella Ray

College of Graduate Studies: Theses & Dissertations

Epigenetic mechanisms are increasingly understood to have major impacts across ecology. However, one molecular epigenetic mechanism, DNA methylation, currently dominates the literature. A second mechanism, histone modification, is likely important to ecologically relevant phenotypes and thus warrants investigation, especially because molecular interplay between methylation and histone acetylation can strongly affect gene expression. There are a limited number of histone acetylation studies on non-model organisms, yet those that exist show that it can impact gene expression and phenotypic plasticity. Wild birds provide an excellent system to investigate histone acetylation, as free-living individuals must rapidly adjust to environmental change. Here, we screen …

Encapsulating Scars, Ashley Smith

College of Graduate Studies: Theses & Dissertations

My work explores scars through encapsulation, a desire to enclose and express the emotional scars of memories or physical scars of the body. Life’s experiences impact the living, leaving behind scars that we feel the need to understand. Through the mediums of metal and mixed-media photography, I utilize found and created imagery, as well as a triality of text in order to preserve and remember these scars.

Applications Of Predictive And Generative Ai Algorithms: Regression Modeling, Customized Large Language Models, And Text-To-Image Generative Diffusion Models, Suhaima Jamal

College of Graduate Studies: Theses & Dissertations

The integration of Machine Learning (ML) and Artificial Intelligence (AI) algorithms has radically changed predictive modeling and classification tasks, enhancing a multitude of domains with unprecedented analytical capabilities. Predictive modeling leverages ML and AI to forecast future trends or behaviors based on historical data, while classification tasks categorize data into distinct classes, from email filtering to medical diagnosis. Concurrently, text-to-image generation has emerged as a transformative potential, allowing visual content creation directly from textual descriptions. These advancements are pivotal in design, art, entertainment, and visual communication, as well as enhancing creativity and productivity. This work explores three significant studies in …

Self-Authorship Among First-Generation Learners: A Qualitative Study, Issac C. Taylor

College of Graduate Studies: Theses & Dissertations

In the realm of higher education, an increasingly important concern is the intellectual capacity of first-generation learners. To improve their cognitive, intrapersonal, and interpersonal development in contemporary society, it is essential for institutions to gain a comprehensive understanding of these students' unique challenges. The existing body of literature on first-generation students has predominantly centered on the personal challenges and institutional barriers that impede their pursuit of higher education. However, promoting self-authorship among this student population presents a unique opportunity for faculty, staff, and administrators to facilitate and reinforce the developmental needs of students who are the first in their families …

Computer Cravings In 20th Century Schools: From Creativity To Capitalism, Keely E. Amos

College of Graduate Studies: Theses & Dissertations

This dissertation examines the push for computers in education from the early 1980s to the early 2000s. During that time, computers were introduced into schools across America with big promises, in turn creating big dreams. Instead of the cognition, creativity, and collaboration that was envisioned with computers in the classroom, the shifting motivations regarding computers have exacerbated the datafication and standardization of our students (Cuban, 2001). The problems associated with the corporation of computers into the curriculum are widespread (Pinar et. al, 1995/2004). Following the methodology of Historiography, this paper provides a critical examination about what was promised, and by …

A Novel Magnetorheological Pump Concept For Insulin Delivery, Mohammad Towhidul Islam Rimon

College of Graduate Studies: Theses & Dissertations

Over the past 25 years, awareness of type 1 diabetes has significantly increased, leading to a comprehensive understanding of various aspects, including its genetics, epidemiology, and disease burden. According to the Type 1 Diabetic Index, about 8.7 million people around the world live with this long-term autoimmune disease characterized by insulin deficiency and resultant hyperglycemia. However, the increased availability and utilization of artificial pancreas systems could potentially save 673,000 lives by 2040. Although, the advancement of diabetes technology offers Type 1 diabetic patients more tools to enhance glycemic management and achieve effective outcomes, many patients are still hesitant to adopt …

Variation In The Fear Response Of Atlantic Sand Fiddler Crabs (Leptuca Pugilator) To Anthropogenic Disturbance, Katrina L. Buttram

College of Graduate Studies: Theses & Dissertations

Leptuca pugilator is a common inhabitant of southeast Georgia salt marshes. This study examined the boldness of Leptuca pugilator across environmental conditions and human impacts. Here, boldness was defined as time taken to reemerge from a burrow after a fear stimulus. I hypothesized that crabs would vary in their boldness based on their surroundings, reproductive timing, and sex. Field and experimental trials were conducted to isolate which factors most influence boldness. Field trials were conducted at four sites varying in human influence throughout the breeding season. During each survey, vegetation height, substrate temperature, average burrow width, burrow count, and distance …

Assessing Performance Optimization Strategies In Cloud-Native Environments Through Containerization And Orchestration Analysis, Daniel E. Ukene

College of Graduate Studies: Theses & Dissertations

This thesis comprises three distinct, yet interconnected studies addressing critical aspects of web infrastructure management. We begin by studying containerization via Docker and its impact on web server performance, focusing on Apache and Nginx hosted on virtualized environments. Through meticulous load testing and analysis, we provide insights into the comparative performance of these servers, adding users of this technology know which webservers to leverage when hosting their webservice along alongside the infrastructure to host it on. Next, we expand our focus to examine the performance of caching systems, namely Redis and Memcached, across traditional VMs and Docker containers. By comparing …

The U.S. Southern Mothers Perspective On Affection, Destiny M. Rose

College of Graduate Studies: Theses & Dissertations

This qualitative research study utilizes Murray Bowen’s Family Systems Theory and Kimberlé Crenshaw’s Intersectionality Theory to examine how ten mothers residing in what is identified as the U.S. Deep South (Georgia, Alabama, and South Carolina) perceive affection shown to their children by adults outside of their nuclear family. Additionally, this study considers the influence social class plays in how parents in the Deep South navigate and negotiate social and cultural norms when it comes to affection displays shown to their children. Data was collected using thematic analysis to describe how parents in parts of the Deep South perceive affection shown …

Training Underrepresented Minority Students For Careers In Public Health Leadership – Public Health Leaders Fellowship Program, Jigsa Tola

College of Graduate Studies: Theses & Dissertations

Background: Shortage and lack of diversity in the United States public health workforce is well documented and remains a challenge to meaningfully improving the health of the population. Although the diversity of the public health workforce has implications for access, care quality, and career opportunities in low-income communities, there is no strong mechanism by which minorities are trained to replenish the workforce. Morehouse College’s Public Health Leaders Fellowship Program (MC-PHLFP) is a cooperative program with the Centers for Disease Control and Prevention (CDC) to train undergraduate students for careers in public health leadership.

Purpose: The purpose of this research is …

Scattering Of Electromagnetic Radiation By Bianisotropic Spheres, Maxwell A. Wallace

College of Graduate Studies: Theses & Dissertations

Modern developments in materials science have led to the increased demand for the ability to control electromagnetic radiation at scales smaller than ever. One of the most important areas of research for controlling the manipulation of electromagnetic radiation, has been the studying of novel optical metamaterials, including the most general and complex form, bianisotropic metamaterials (BAMs). With modern developments in nano- engineering, paired with the advancement of more robust theoretical studies of BAMs, the demand for more novel BAM technologies has increased. With the advent of research of unbounded BAM media, as well as the recent extensions of Mie theory …

Always A Dreamer, Liz Walker

College of Graduate Studies: Theses & Dissertations

ABSTRACT

This is the story of my life in the form of a memoir. You might ask, why is my life a relevant subject for a dissertation? As Celeste Snowber, the scholar, author and performer recently said to me, “I think it would be wonderful to write a memoir.... You clearly have an extraordinary life, with art, soul and the depths of wisdom marinating all you do” (2023, personal communication). I was flattered by her comments and her confidence in me gave me the inspiration I needed to tell my story. There is also the meaning of ‘lived experience’ in …

Railroad Condition Monitoring Using Distributed Acoustic Sensing And Deep Learning Techniques, Md Arifur Rahman

College of Graduate Studies: Theses & Dissertations

Proper condition monitoring has been a major issue among railroad administrations since it might cause catastrophic dilemmas that lead to fatalities or damage to the infrastructure. Although various aspects of train safety have been conducted by scholars, in-motion monitoring detection of defect occurrence, cause, and severity is still a big concern. Hence extensive studies are still required to enhance the accuracy of inspection methods for railroad condition monitoring (CM). Distributed acoustic sensing (DAS) has been recognized as a promising method because of its sensing capabilities over long distances and for massive structures. As DAS produces large datasets, algorithms for precise …

Cybercrime Victimization: Online Routine Behaviors, Guardianship, And Identity Theft Victimization In A Nationally Reflective Sample, Ifeoluwa Stella Elegbe

College of Graduate Studies: Theses & Dissertations

In this digital era, cybercrime victimization has emerged as a significant issue, with identity theft being one of the most prevalent forms. This study examines the relationship between online routine behaviors, guardianship, demographics, and identity theft victimization in a nationally representative sample of U.S. adults utilizing routine activities theory (RAT) as a conceptual

framework. The research applies statistical methods such as descriptive statistics, correlation analysis, and logistic regression models to examine theoretically oriented hypotheses. The

hypotheses suggest connections between different online habitual behaviors, steps taken to

protect oneself, demographic characteristics, and the extent to which one has been a victim …

Letters To Myself ~ Reflections Of A New Teacher ~ A Curriculum Of Self, Sarah Brittany S. Greneker

College of Graduate Studies: Theses & Dissertations

This is a nontraditional, very creative approach to dissertation writing. Using reflective poetic inquiry, I reflect on my experiences transitioning from pre-service to in-service teacher in the early childhood classroom. I taught for 7 years and encountered many situations that would have been beneficial to know prior to becoming a certified teacher. I explore overarching themes of coworker relationships, undergraduate program preparation, the various responsibilities, classroom environment, teacher evaluation, teacher perspective, and teacher mental health and well-being and how they each impact a teacher’s experience in the classroom. This is accomplished through the epistolary genre and letters to myself as …

Neo Retro: Rapid Prototyping And The Evolving Role Of Artistic Practice, Robert D. Miller

College of Graduate Studies: Theses & Dissertations

My art is always executed with a timeline in mind. I am influenced by a world as it exists in the distance past, the recent past, the present (with all its multifaceted complexities), and the near future (as it applies to my legacy after I'm gone), as well as the distance future. Time and space – to me - are all part of a grand narrative. The art that I create is an indexical gesture of my creative processes and these creative processes are reflected in the imagery that I create as well as the materials I use for my …

Meeting The Moment: Seeking A Symbiosis Of Economic Theory And Practice In Times Of Crisis, Sallie Taylor Manning

College of Graduate Studies: Theses & Dissertations

By their nature, crises upset the status quo and shake apart the ways of being and doing for individuals, families, communities, nations, institutions, and governments. This research seeks to identify the ways in which times of crisis led to changes in high school economics curriculum. The Georgia Performance Standards for high school economics curriculum were examined over a 23-year period to determine the extent to which three national and international crises led to changes in economics curriculum. A historiography was created for each of three crises, September 11, 2001 (9/11), Hurricane Katrina, and the Great Recession of 2008. The Georgia …

White Woman In A Black Barbershop: Examining Racial Literacy Through Epistemic Curricula Spaces, Megan Paulk

College of Graduate Studies: Theses & Dissertations

The following study is an autoethnography of the researcher, a White Mother of a Black Family (WMOBF). Follow her journey as she examines her racial literacy through the construction of Season Two of her podcast White Women in a Black Barbershop, where she is conversing with three other WMOBF who geographically grew up in the same small town in Maryland. The podcast analysis method is introduced as a method of data collection and analysis. The results of the study are the creation of eight epistemic curricula spaces. These spaces contain movement, are not linear, and are not accessible to all. …

Joy In The Focus, Focus On The Joy, Alicia Cully

College of Graduate Studies: Theses & Dissertations

This body of work, Joy in the Focus, Focus on the Joy is an engendered unspoken symbolic language generated from the handwritten words of the English language that are defined or viewed with positive connotations. These symbols are meant to spread the feelings each word embodies with what resonates with the priori or memory of the audience. The symbolic language is a key for an individual to make their own connections with how the symbol’s meaning makes them feel,, resulting in an openly welcome invitation to reach a focused joy in connecting with the displayed feeling(s). My drive to create …

Cross-Layer Performance Evaluation Of C-V2x, Dhruba Sunuwar

College of Graduate Studies: Theses & Dissertations

The evolution of connected vehicles from a distant futuristic concept to an integral part of daily life is indisputable. Vehicle-to-everything communication (V2X) serves as the cornerstone of this transformation, facilitating seamless interaction among vehicles, infrastructure, pedestrians, and networks. However, evaluating V2X system performance proves intricate due to the dynamic nature of vehicles influenced by mobility factors. To address this complexity, we have developed a specialized system-level simulator expressly for evaluating V2X communication performance. Notably, the simulator encompasses (i) intelligent transportation system (ITS) scenarios integrated into a geographical framework and (ii) the capability to assess cross-layer performance spanning physical (PHY) and …