Indefinability Of Effective Stress For Unsaturated Soils, Xiong Zhang, Sandra Houston

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

For decades, researchers have searched for an unsaturated soil effective stress that performs analogously to effective stress for saturated soils and provides some simplifications over net stress and suction approaches. A recent debate is whether problems identified with unsaturated soil effective stress can be resolved via elastoplastic analyses. Effective stress equations are reviewed and categorized as being based on volume change, shear strength, yield, or degree of saturation. These equations are evaluated for consistency with saturated soil effective stress expectations using the Barcelona basic model (BBM), simplified into an integrated elastoplastic framework using the modified state surface approach (MSSA). Under …

Quantifying The Impact Of Technology Utilization On Schedule And Cost Performance In Construction Projects, Fareed Salih, Islam H. El-Adaway

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

There Has Been a Plethora of Research on the Performance of Schedule and Cost in Construction Projects. However, Current Research Falls Short in Investigating the Combined Contribution of Different Construction Technologies on Project Performance Metrics. Specifically, None of the Previous Efforts Have Used Integrated Earned Value Management (EVM) Parameters and Utilized Construction Technologies to Assess Project Schedule and Cost Performance. This Paper Fills This Knowledge Gap. to This End, a Multistep Research Methodology Was Employed to (1) Explore the Utilization Ratings of 13 Construction Technologies based on Data Collected from 52 Industry Experts; (2) Rank These Technologies in Terms of …

Alcohol And Cognition: Ego Threat As A Moderator, Erin Prince

Masters Theses and Doctoral Dissertations

This study examined how ego threat (negative feedback) interacts with alcohol consumption to influence cognitive performance. We hypothesized ego threat would moderate the effects of alcohol on impulse control and attention in 30 college students (21-49 years). A 2×2 factorial design assessed performance on the Visual Search Task (attention) and Go/No-Go Task (impulse control) under laboratory and naturalistic settings, while sober or intoxicated. Alcohol consumption impaired performance, as evidenced by slower reaction times during visual search. An interaction effect emerged, with the combination of alcohol and ego threat further compromising reaction times. Interestingly, higher baseline impulsivity correlated with faster reaction …

College Students' Perceptions Of Malingering Attention Deficit Hyperactivity Disorder, Nicolas Maynard

Masters Theses and Doctoral Dissertations

This study assessed college students’ knowledge and perceptions of attention deficit hyperactivity disorder (ADHD) to help identify patterns of behavior in those who malinger ADHD in a college environment. Specifically, I sought to determine what behaviors college students attribute to ADHD and how those behaviors are demonstrated when malingering the disorder. Participants in this study were neurotypical college students and those with a valid ADHD diagnosis. Half of the neurotypical participants were instructed to malinger ADHD on all study assessments. Participants who were instructed to malinger ADHD subjectively reported significantly more symptoms than their neurotypical peers, but not their valid …

Evaluation Of Manual Thermal Brake Screening Systems, Jeeyen Koo, David Leddy, Jennifer Walton

Kentucky Transportation Center Research Report

In 2021, manual thermal brake screening systems were installed at Lyon EB and Rowan County weigh stations. Two additional units were installed at Laurel SB and Scott County weigh stations the following year. Although this system is called a thermal brake screening system, its thermal camera images are used to find both brake and tire-related violations. At the time of this project, Lyon (EB), Rowan, and Scott County inspection locations also had tire pressure detection systems in addition to manual thermal brake screening systems. Both systems can be used to identify tire-related violations, but inspectors prefer to use the tire …

Msw Portfolio, Heather Hopkin

Graduate Student Portfolios, Professional Papers, and Capstone Projects

No abstract provided.

Msw Portfolio, Tailor L. Schlotzhauer

Graduate Student Portfolios, Professional Papers, and Capstone Projects

No abstract provided.

Venturing In Limbo: Entrepreneurial Resourcefulness By The Forcibly Displaced., Sadek Showkat

Electronic Theses and Dissertations

Entrepreneurial resourcefulness is an overarching concept in the entrepreneurial process that has gained momentum among theorists and practitioners. Traditionally, entrepreneurial resourcefulness is theorized as a state—a behavior or trait—rather than a process. However, our understanding of this concept changes significantly when viewed through the lens of the lived experiences of forcibly displaced individuals. This dissertation presents a theoretical and empirical investigation of how these entrepreneurs pursue entrepreneurial resourcefulness through three interrelated essays. The first essay provides a problematizing review and introduces a novel typology (exogenous vs. endogenous) that captures the heterogeneity of the construction of entrepreneurial resourcefulness across …

Racial Identity & Psychological Distress: The Mediating Role Of Sense Of Community And Spiritual Struggles Among Black Christians., Adebayo Ajibade

Electronic Theses and Dissertations

Religious practice and church membership have historically been protective and critical in Black communities in the United States and across the African diaspora. Demographic studies have shown a consistent decline in religious adherence and practice across racial and ethnic groups in the United States. However, the decline in religious practice and participation in religious communities has been less pronounced among individuals of African descent. Participation in one’s religious community is often a source of positive social engagement and can foster positive intrapersonal outcomes (e.g., wellbeing). However, religious communities and religious practice can also be the source of conflict and emotional …

Virtual Engagement: Can Law Enforcement Benefit From Utilizing Extended Reality In Their Training Systems?, Jacob Maxwell Read

Electronic Theses and Dissertations

Introduction: Extended reality (XR) technologies offer innovative training solutions for various industries, including healthcare, manufacturing, aviation, sports, military, and law enforcement. XR can provide a solution for training where job tasks are difficult or near impossible to train in real-life. A human factors research and design approach could provide an effective, low-risk, and cost and time-efficient option for integrating the use of XR technology into training for many industries. To advance this goal, this research answered two main research questions: (1) What training needs/challenges are best suited for an XR training system designed for law enforcement officers (LEOs)? (2) …

Contested Spaces: Unhoused Black Men And Their Survival Within The Urban Landscape., Jonathan Riley Ellis

Electronic Theses and Dissertations

Thousands of unhoused Black men sleep, live and eat on the streets daily. Many lack the essential resources to survive through the elements. However, little is known about how unhoused Black men share space with the public, businesses, law enforcement and each other. Furthermore, little is known about how unhoused Black men access services once displacement has occurred. Drawing on participant observation and in-depth interviews, I examine how unhoused Black men navigate occupied urban spaces. I find that unhoused Black men regularly encounter contested spaces with businesses, the public, hospitals, and law enforcement. Additionally, unhoused Black men must navigate through …

Imperial Nostalgia: The War For The Kievan Rus Legacy., Jacob Wolfe

Electronic Theses and Dissertations

This thesis explores the deep-seated historical, cultural, and religious narratives fueling the modern conflict between Russia and Ukraine. Central to this dispute is the legacy of the Kievan Rus, a medieval East Slavic state. The research examines historical claims over the Kievan Rus legacy, Russia's perception as the heir to the Eastern Orthodox Church, and the impact of the Soviet Union's dissolution. It also delves into the Varangian Guard's role in establishing Kievan Rus-Byzantine relations, the mistrust instilled by the Crusades, and the shared linguistic and cultural influences between Russia and Ukraine. Additionally, the thesis analyzes the Normanist Controversy, Russian …

Bayesian Approaches In Multi-State Markov Models And High Dimensional Time-To-Event Data., Yuchen Han

Electronic Theses and Dissertations

This dissertation consists of two projects. The first one involves nonparametric methods on Continuous Time Markov Chains (CTMCs). The second one is centered around Bayesian shrinkage models for detecting prognostic and predictive biomarkers in high-dimensional clinical data. Both these projects build on methods from across the frequentist and Bayesian paradigm to offer novel solutions. In the first project, we aim to model the nonlinear effects of continuous variables within multistate framework in a non-parametrically by appealing to the rich mathematical framework of Reproducing Kernel Hilbert Spaces (RKHS). Then we adapted the classical Representer Theorem to penalized (squared norm) log-likelihood which …

Health Professions Education And Critical Action Engagement: A Mixed Method Analysis., Leonda Richardson

Electronic Theses and Dissertations

Poorer health outcomes disproportionately impact racial/ethnically minoritized (e.g., Black Indigenous People of Color, or BIPOC) populations in the U.S. One plausible reason for the persistence of poorer health outcomes among this population is the teaching of racialized curricular content within academic health professions programs. This includes the absence of appropriate context through explicit socio-political curricular content (SPC) and critical pedagogy (i.e., social and structural determinants of health, history of racism in health care, social justice concepts; dialogue and reflective writing). Racialized curriculum is thought to initiate and/or exacerbate existing racial biases, cultural incompetence, and perpetuate dominant medical ideologies and myths …

Molecular Mechanisms Of Exercise-Stimulated Resolution Of Inflammation And Its Dietary Dependence., Ernesto H. Pena Calderin

Electronic Theses and Dissertations

Diet-induced obesity and adipose tissue (AT) inflammation that ensues sets the stage for systemic metabolic inflammation, disrupted insulin signaling, and eventual type 2 diabetes (T2D) development. At the center of this pathology lies a disruption in endogenous inflammation resolution pathways characterized by an imbalance in lipid mediator production (greater abundance of pro-inflammatory to pro-resolving lipids). Additionally, obese states are characterized by adrenergic deficiency, especially in response to physical activity. Inflammatory processes have been experimentally mitigated by either the pharmacological inhibition of pro-inflammatory signals (i.e., Leukotriene B₄ (LTB₄) and its receptor BLT1, which establishes a potent chemotactic stimulus …

Epidural Stimulation For Urogenital Dysfunction In The Spinal Cord Injured Rat., Natasha Lorraine Wilkins

Electronic Theses and Dissertations

Spinal cord injury (SCI) is a devastating, life changing event that greatly impacts quality of life. SCI can have body-wide, multi-system consequences including dysfunction within the urogenital system. Challenges with the urinary system include urinary incontinence, urine retention, and detrusor-sphincter dyssynergia all of which require maintenance through the regular use of catheters. Sexual dysfunction in men, who comprise nearly 80% of the SCI population, includes erectile dysfunction, anejaculation, retrograde ejaculation, poor expulsive force during ejaculation, and poor sperm quality. The treatment for sexual function in SCI men is focused more on fertility through the collection of sperm for insemination procedures …

Associations Of Natural Vegetation In Relation To Colorectal Cancer Hotspots And Colorectal Cancer Survival., Johnnie Newton

Electronic Theses and Dissertations

Background: Across Kentucky, county-level geographic disparities in colorectal cancer (CRC) incidence and outcomes exist. Given the heterogeneity of lifestyle, socioeconomic (SES), and environmental factors within a county, more granular approaches should be used to identify local areas with a high CRC burden and identify the area-level factors that may contribute to geographic disparities. Studies reported that living in greener areas is associated with beneficial health outcomes, including lower mortality. Despite growing evidence that natural vegetation (greenness) exposure is associated with increased physical activity and obesity, two well-known CRC risk factors, epidemiological studies investigating the association of residential greenness exposure with …

Towards High Performance And Energy Efficient Data Centers., Bryan Harris

Electronic Theses and Dissertations

Our modern society has become ever more connected and reliant on ever larger quantities of data, which must be collected and processed over large geographic areas. The data centers that store, compute, and share this data have grown to such a scale that many data centers use as much electricity as a city. Priorities in research have shifted from not only seeking greater performance, but also towards greater energy efficiency. The control and management of computer systems has an impact on power consumption beyond the needs of individual components. In this dissertation, we examine techniques for improved performance and energy …

Exploring Medicaid Stigma In Kentucky., Malea Hoepf Young

Electronic Theses and Dissertations

Health insurance is only one of many factors involved in becoming and staying healthy, but the importance of having coverage in the U.S. cannot be overstated. Medicaid provides health care coverage for millions of Americans, with enrollment increasing dramatically after the Affordable Care Act allowed states to expand eligibility. While there is a great deal of research on the impacts of Medicaid expansion on newly eligible adults, there is little research on negative attitudes towards people using Medicaid, or on Medicaid stigma. This study used qualitative methods to conceptualize stigma around Medicaid through discussions with individuals using Medicaid and enrollment …

Social Identity And Personhood At An Early Byzantine Cemetery: Late Antique Child Burials At Syedra, Turkiye., Mekenzie Riley Davis

Electronic Theses and Dissertations

Bioarchaeological studies of children in the past have proliferated in recent years and illustrate the informational depths accessible through investigations of mortality, age, and health and disease. Alongside analyses of childhood stress and mortality, the mortuary treatment of children provides critical insight into the social structures and identity formation processes that individuals or groups are subject to in life. This thesis will investigate the intersections of childhood, gender and sex, space, and mortuary treatment as seen in a Byzantine cemetery comprised primarily of children at the site of Syedra, Türkiye through bioarchaeological and proteomic analysis. Specifically, it seeks to explore …

Synergistic Strategies In Hybrid Mxed Matrix 3d Printing Of Thermoplastics & Thermosets: Design, Manufacturing, And Materials Development., Saleh Akram Khanjar

Electronic Theses and Dissertations

Composite manufacturing and mixed matrix structures have been produced using traditional manufacturing processes for various industrial applications due to their high mechanical properties to material weight and cost ratio. However implementation of composite and mixed matrix manufacturing with advanced manufacturing such as additive manufacturing is limited due to the hardware limitations of current 3d printing technologies and materials available for 3D printing applications. This work has developed and investigated a new hybrid 3D printing manufacturing process utilizing a variety of material systems (thermoplastic – thermoset, thermoplastic – thermoplastic, thermoset – thermoset, thermoplastic – thermoplastic – thermoset). This study developed thermoplastic …

Adaptive Robot Collaboration Using Robotic Skin And Motion Similarity., Jordan Dowdy

Electronic Theses and Dissertations

An essential part of robotics research is human-robot collaboration, which enables the use of current and new robots in everyday life and the workforce. This research applies to both parts of human-robot collaboration: physical human-robot interaction (pHRI), as well as non-physical human-robot interaction. The physical interaction uses tactile sensors and a Neuroadaptive Controller (NAC) to allow for the guidance of a robotic arm and its end-effector. The non-physical interaction uses a novel motion similarity metric, the Cartesian Segment Online Dynamic Time-Warping (SODTW), to allow a robot to better adapt to the speed of the user performing the motion during imitation …

Effects Of A Protection Zone In A Reaction-Diffusion Model With Shifting Bounded Habitat And Allee Effect., Davis Henderson

Electronic Theses and Dissertations

We consider a reaction-diffusion equation that models a population in a shifting bounded habitat with a protection zone and the Allee effect. We assume that the population growth function exhibits the strong Allee effect and has a positive integral within the protection zone (indicating population persistence) and a negative integral in the surrounding patches (indicating population decay). We prove that the existence of steady-state solutions to this system depends on the length of the protection zone. It is demonstrated that there exists some value H* such that, for a protection zone of size H*, there exists a solution and, for …

Figure Worlds: An Analysis Of The Untold Stories Of Female Teachers Of Color., Anetria B. Swanson

Electronic Theses and Dissertations

This dissertation explores the lived experiences of Black female teachers in a large urban school district, focusing on how these experiences shape their identities, influence their professional practices, and affect their retention in the profession. Despite the growing recognition of the importance of teacher diversity, Black female teachers often encounter unique challenges, including systemic racism, microaggressions, and a lack of support and resources. Through a narrative inquiry approach, this study amplifies the voices of nine Black female teachers, uncovering their stories and the complexities of their professional lives. Guided by Critical Race Theory and the concept of figured worlds, this …

Development And Processing Of Shape Memory Polymer Composites (Smpcs) For Application In Structural Robotics And Robotic Sensors., Kavish Sudan

Electronic Theses and Dissertations

Shape Memory Polymers (SMPs) have attracted significant attention since their introduction in the 1980s due to their remarkable ability to regain their original shape from a temporarily deformed state when exposed to an external stimulus, typically heat. This shape memory effect, driven by thermal transitions such as the glass transition temperature (T_g) or melting temperature (T_m), has made SMPs highly attractive for applications in soft robotics, aerospace, and biomedical devices. However, SMPs face challenges such as limited mechanical strength, thermal stability, and electrical conductivity, which hinder their broader adoption in advanced applications. To address these challenges, …

Industrial Applications Of Molecular Techniques., Jesse Lee Rozsa

Electronic Theses and Dissertations

Multidisciplinary research is vital in modern science. Combining molecular genetics with engineering disciplines such as material science, robotics, or 3D printing is not a new concept but one that can continue to lead to breakthroughs that will benefit society. Science does not and should not occur in a vacuum, and, in early 2020, the world saw the emergence of a pandemic that shifted the focus of scientific research for a time. This manuscript describes aspects of this journey and the fruit that was born from this historic event. In this dissertation, we used plants and bacteria to produce compounds that …

The Role Of Forest Disturbance And Habitat Characteristics In Shaping Arthropod Ecology., Kane Alec Lawhorn

Electronic Theses and Dissertations

Disturbances in forests often generate dead wood, which is an important resource for a variety of arthropods. In tropical wet forests where fire is rare, lightning and branchfalls are common disturbances that create canopy gaps with associated large amounts of localized dead wood. By contrast, prescribed fire is a common disturbance in temperate forest that creates habitat heterogeneity and widely dispersed dead wood resources. The ecological effects of these disturbances on arthropod communities are largely unknown. This dissertation investigates how disturbance and habitat associations in both tropical and temperate forest shape arthropod ecology. Throughout, I primarily focus on beetles, ants, …

The Impact Of Internal Curing Additives On Compressive Strength, Shrinkage, And Internal Relative Humidity Of Mortars., Payton Scott

Electronic Theses and Dissertations

Curing is a critical step in concrete construction. When a concrete specimen is properly cured, its shrinkage and early age curling/warping can be reduced, and the concrete strength can be increased. Curing methods can be divided into two categories: traditional external curing and emerging internal curing methods. Internal curing has similar benefits to external curing, such as reduced early-age cracking and shrinkage risk, and increased durability and strength. The purpose of this research is to investigate internal curing additives and their impact on length change, weight change, compressive strength, autogenous shrinkage, and internal relative humidity. Mortar mixtures with lightweight aggregate …

Relation Between The Negative Cognitive Triad, Perceived Everyday Discrimination, Depressive Symptoms, And Tnf-A In Adolescents., Ashley Ann Marshall Dondanville

Electronic Theses and Dissertations

This study is based on Beck's cognitive stress-vulnerability model of depression and previous research on (a) the increased risk for severe illnesses associated with TNF-⍺ (i.e., an inflammatory cytokine), (b) the effect of perceived everyday discrimination (PED) on depressive symptoms and TNF-⍺, (c) the association between depressive symptoms and TNF-⍺, (d) and findings that the negative cognitive triad (i.e., negative views of the self, world, and future) serves as a partial mediator between PED and depressive symptoms. The purpose of this study is to integrate Beck’s model and these different research lines by inspecting the associations between the stressor PED …

Relations Between Discrimination, Negative Attribution Style, Cortisol, And Depressive Symptoms In Adolescents., Hannah Widmer

Electronic Theses and Dissertations

The aim of our study was to integrate the chronic stressor of Perceived Everyday Discrimination (PED) into the Hopelessness Theory of Depression with a focus on the comorbidity between physical and mental health by way of depressive symptoms and cortisol in adolescents. Research has shown that cognitive diatheses mediate the relation between stress and depressive symptoms and cortisol predicts depression. We hypothesized that Negative Attribution Style (NAS) and cortisol would mediate the relation between PED and depressive symptoms. Altogether, 99 adolescents (mean age: 14.10 years, 36.4% female; 63.6% male; ethnicity: 2% Latinx; 98.2 % non-Latinx; race: 41.4% Black, 34.8% White, …