Digital Commons Network^™

Energy-Efficient In-Memory Architectures Leveraging Intrinsic Behaviors Of Embedded Mram Devices, Shadi Sheikhfaal

Electronic Theses and Dissertations, 2020-2023

For decades, innovations to surmount the processor versus memory gap and move beyond conventional von Neumann architectures continue to be sought and explored. Recent machine learning models still expend orders of magnitude more time and energy to access data in memory in addition to merely performing the computation itself. This phenomenon referred to as a memory-wall bottleneck, is addressed herein via a completely fresh perspective on logic and memory technology design. The specific solutions developed in this dissertation focus on utilizing intrinsic switching behaviors of embedded MRAM devices to design cross-layer and energy-efficient Compute-in-Memory (CiM) architectures, accelerate the computationally-intensive operations …

Classification Of Ground-Truth Fire Debris Samples Using Neural Networks, Nicholas Thurn

Electronic Theses and Dissertations, 2020-2023

Fire debris samples are currently analyzed according to ASTM E1618-19, which is the "Standard Test Method for Ignitable Liquid Residues in Extracts from Fire Debris Samples by Gas Chromatography-Mass Spectrometry." This method requires that an analyst make a visual comparison to an appropriate reference sample using the total ion and the extracted ion chromatograms. The analyst then provides an opinion about whether an ignitable liquid residue is present in the sample. The method is inherently subjective due to the visual interpretation that is needed. In order to automate this process, this work uses neural networks and a subset of the …

High-Density Neurochemical Microelectrode Array To Monitor Neurotransmitter Secretion, Kevin White

Electronic Theses and Dissertations, 2020-2023

Neuronal exocytosis facilitates the propagation of information through the nervous system pertaining to bodily function, memory, and emotions. Using amperometry, an electrochemical technique that directly detects electroactive molecules, the sub-millisecond dynamics of exocytosis are revealed and the modulation of neurotransmitter secretion due to neurodegenerative diseases or pharmacological treatments can be studied. The method of detection using amperometry is the exchange of electrons due to a redox reaction at an electrochemically sensitive electrode. As electroactive molecules, such as dopamine, undergo oxidation, electrons are released from the molecule to the electrode and an oxidation current is generated and recorded. Despite the significance …

Incinerator Ash Characterization - Implications For Elevated Temperature Landfills, Angel Villarruel-Moore

Electronic Theses and Dissertations, 2020-2023

The occurrence of temperatures in municipal solid waste (MSW) landfill gas (LFG) extraction systems in excess of 55°C is a problem that has gained much attention in the solid waste industry, both domestically and globally. Facilities which frequently experience such temperatures are termed Elevated Temperature Landfills (ETLFs), and recent research conducted at the University of Central Florida (UCF) has provided strong evidence that ash, both MSW incinerator ash (MSWIA) and coal combustion ash (CCA), when co-disposed with unburned MSW, provides materials which are able to participate in abiotic exothermic reactions that may lead to the development or sustainment of ETLFs. …

Using Geographic Information Systems To Analyze The Effects Of Residential Location On Student Academic Success, Courtney Wilson

Electronic Theses and Dissertations, 2020-2023

Purpose: This study aims to assess the impact of social disorganization indicators (i.e., employment, median-household income, owner-occupied housing, crime, poverty, and minority percentage) on academic performance (i.e., GPA) for 6th and 7th-grade students attending seven K-8 designated Orange County Public Schools (OCPS) in central Florida. Methods: A hot spot cluster analysis was used to identify areas where high and low GPA clustering occurs based on the individual block level GPA data obtained from OCPS. Visual map comparison of cluster results and social disorganization indicators were used to understand if high GPA cluster outcomes occur in areas of social disorganization. Moreover, …

An Exploration Of The Intersection Of Critical Disability Theory, Multiple Dimensions Of Identity, And Institutional Policy On Students' Persistence Towards Degree Attainment, Michael Gilmer

Electronic Theses and Dissertations, 2020-2023

The purpose of this phenomenological study was to gain insight into the personal experiences of undergraduate students with learning disabilities and what they identify as impediments to their degree attainment. This study was guided by a conceptual framework connecting the Model of Multiple Dimensions of Identity, Critical Disability Theory, institutional policy/practices, and barriers to the persistence of students towards degree attainment. This qualitative study utilized ten in-depth interviews with undergraduate students who identify as having learning disabilities. The interviews were transcribed and analyzed using Moustakas's (1994) model of analysis. Through this analysis, an understanding was gained of how the participants …

Chitosan-Gallium Nanocomposite: Synthesis, Characterization And Antibacterial Activity, Samjhana Bhandari

Electronic Theses and Dissertations, 2020-2023

The emergence of multidrug-resistant (MDR) strains of bacteria and the lack of a novel class of antibiotics has become a global health concern. Pseudomonas aeruginosa is one common MDR bacteria responsible for nosocomial infections and related mortality worldwide. It has developed resistance against commonly available antibiotics and is in the WHO's priority list of bacteria for which new antibiotics are desperately needed. Currently there is a growing interest in developing metal and non-metal-based nanoparticles to target multidrug-resistant bacteria. The objective of this study is to evaluate the efficacy of a novel nanocomposite of two non-traditional antimicrobials: a metal (Ga-III) and …

Influence Of Geography On The Healthy Gut Microbiome And The Role Of The Gut Microbiome In Ibd Symptom And Disease Progression, Sayf Al-Deen Hassouneh

Electronic Theses and Dissertations, 2020-2023

The human gut microbiome is believed to play an integral role in host health and disease. In a microbial community, associations between constituent members play an important role in determining the overall structure and function of the community. To understand the nature of bacterial associations at the species level in healthy human gut microbiomes, we analyzed previously published collections of whole-genome shotgun sequence data, from fecal samples obtained from four different healthy human populations. Using a Random Forest Classifier, we identified bacterial species that were prevalent in these populations and whose relative abundances could be used to accurately distinguish between …

Applying Machine Learning Techniques To Improve Safety And Mobility Of Urban Transportation Systems Using Infrastructure- And Vehicle-Based Sensors, Zubayer Islam

Electronic Theses and Dissertations, 2020-2023

The importance of sensing technologies in the field of transportation is ever increasing. Rapid improvements of cloud computing, Internet of Vehicles (IoV), and intelligent transport system (ITS) enables fast acquisition of sensor data with immediate processing. Machine learning algorithms provide a way to classify or predict outcomes in a selective and timely fashion. High accuracy and increased volatility are the main features of various learning algorithms. In this dissertation, we aim to use infrastructure- and vehicle-based sensors to improve safety and mobility of urban transportation systems. Smartphone sensors were used in the first study to estimate vehicle trajectory using lane …

Assessment Of Work-Related Feelings Among Teachers Within The United States And Jordan, Shahed Obeidat

Electronic Theses and Dissertations, 2020-2023

Human personalities combined with working conditions affect how employees react to different work situations. Personality and work environment have also been shown to affect workers' feelings. Employees' psychological health plays an essential role in their performance and productivity in the workplace, and organizational awareness of work-related feelings has sparked interest in investigating this field of study. Teaching is a stressful job; however, research evaluating discrete states of work-related emotions in teachers remains somewhat limited. This study investigated the effects of job demands on teachers' work-related feelings within middle and high schools in the United States and Jordan. The study results …

Index-Based Approach With Remote Sensing For The Assessment Of Extreme Weather Impact On Watershed Vegetation Dynamics, Kushan Bellanthudawage

Electronic Theses and Dissertations, 2020-2023

Spatial technologies such as satellite remote sensing can be used to identify vegetation dynamics over space and time, which play a critical role in earth observations. Biophysical and biochemical features associated with vegetation cover can then be used to elucidate climate change impact such as floods and droughts on ecosystem that may in turn affect watershed-scale water resources management. Unlike single flood or drought event, intermittent extreme weather events may exert more physiological and biological pressures on the canopy vegetation. This study aims to investigate the climate change impacts on canopy vegetation, which occurred from March 2017 to October 2017 …

An Illusional Nuclear Taboo: Mechanisms Of Domestic Attitudinal Patterns For Extreme Methods Of War, Doreen Horschig

Electronic Theses and Dissertations, 2020-2023

This dissertation studies public attitudes toward nuclear weapons. When do people become more willing to endorse a preemptive nuclear strike against a foreign country? Utilizing theoretical insights from international relations, comparative politics, and social psychology and original experimental survey data from Israel and the U.S., this dissertation aims to answer these questions. Influential strands of scholarship argue that both the public and political elites have internalized anti-nuclear norms. The critics, however, assert that the moral nuclear taboo lacks robustness. The dissertation joins this debate by offering a novel theoretical framework informed by terror management theory (TMT) and suggests that people …

Assessing The Role Of Disturbance In Estuarine Fish Community Dynamics, Dakota Lewis

Electronic Theses and Dissertations, 2020-2023

Ecological disturbances alter biotic communities and ecosystems. In many coastal zones disturbances are increasing, including algal blooms, storms, hypoxic events, and fish kills. These disturbances are often related, for example blooms releasing toxins or depleting dissolved oxygen, ultimately killing fish. Depending on the intensity, duration, and geographic extent of a disturbance, the fish community can take days to years to recover from disturbances. To explore the relationships among environmental disturbances, sport fish, and forage fish communities, this thesis examined two Florida estuaries with differing disturbance regimes. Using an ensemble modelling approach combining generalized linear models (GLM), Bayesian modelling, and Bayesian …

Mutilated Masculinity: Intersections Of Disability, Gender, And Mental Health In Modernist Fiction, Sara Thames

Electronic Theses and Dissertations, 2020-2023

This thesis investigates the impact of the intersection of physical disabilities and mental health conditions on the masculine identities presented in modernist texts. Here, I analyze a collection of works by Ernest Hemingway, D.H. Lawrence, Claude McKay, and Wilfred Owen. Utilizing a combination of theoretical approaches: trauma theory, gender and sexuality studies, narratology, disability studies, and insights from the medical humanities, I revisit well-known novels like The Sun Also Rises and Lady Chatterley's Lover and illuminate lesser-studied works like "A Natural History of the Dead" and the recently published Romance in Marseille. I recognize here the psychosocial struggles faced by …

A Drosophila P5b-Type Atpase Is Required For Polyamine Transport, David Brown

Electronic Theses and Dissertations, 2020-2023

In eukaryotes P-type ATPases are represented by a superfamily of membrane ion and lipid transporters divided into five subclasses. Substrates for classes 1-4 have been identified, however little is known about the substrate specificity of the P-type 5A and 5B transporters. Here we show that the Drosophila gene anne boleyn encodes a family of six P5B-type ATPases. Using a combination of RNAi, insertional mutagenesis, and CRISPR-Cas9 gene editing we show that some of these isoforms are required for polyamine transport and others are not. In addition, we show that the Drosophila P5A-type ATPase, encoded by CG6230 is not required for …

Bacterial Association Networks From Healthy And Cancer-Associated Gut Microbiomes, Mark Loftus

Electronic Theses and Dissertations, 2020-2023

The human gastrointestinal tract is colonized by a diverse community of symbiotic microorganisms, mainly bacteria, that are known to play essential roles in maintaining the health of their human host. Disruption of this bacterial community has been associated with numerous diseases, including Colorectal Cancer (CRC). CRC is one of the leading causes of cancer-related deaths worldwide. As such, focus has been placed on the modulation of the bacterial community within the cancer-associated gut microbiome as the next step in possible CRC treatment and prevention strategies. To use the bacterial community for these purposes, a better understanding of the associations that …

Identifying The Links Between Mental Frameworks, Context Features, And Driver Attention In Complete Streets Environments, Patricia Tice

Electronic Theses and Dissertations, 2020-2023

Complete street systems integrate a wide range of users in the same space, with unequal risks and responsibilities. This makes driver attention a critical factor in assuring the safety of vulnerable users. The Conditioned Anticipation of People psychological model of driver attention proposes that drivers reflexively reengage their metacognitive processes when they anticipate visually interacting with the human face or form due to the neurological priority that the brain places on human recognition. To test this model, an eye-tracking tabulation was generated from the SHRP2 Naturalistic Driving Study that measured midsegment percent of time on-task and multitasking behavior for 200 …

Competence Transcriptome Changes In Streptococcus Pneumoniae, Smitha Shambhu

Electronic Theses and Dissertations, 2020-2023

Streptococcus pneumoniae is a human commensal and the causative agent of pneumococcal disease. Pneumococci are naturally competent – able to uptake exogenous DNA from the environment and incorporate it into their genome through homologous and non-homologous recombination. Recombination has significantly shaped the evolutionary history of S. pneumoniae, as it allows pneumococci to rapidly adapt to interventions such as antibiotic therapy or vaccine introduction. Recombination frequencies vary considerably across pneumococcal populations; yet the underlying mechanisms for these variations are not well understood. Entry and exit into competence, a state in which the cell can uptake DNA, is tightly regulated through transcriptional …

Towards Enabling Explanation In Safety-Critical Artificial Intelligence Systems, Andy Michel

Electronic Theses and Dissertations, 2020-2023

With the advancement of accelerated hardware in recent years, there has been a surge in the development and application of intelligent systems. Deep learning systems, in particular, have shown exciting results in a wide range of tasks: classification, detection, and recognition. Despite these remarkable achievements, there remains an active research area that aims to increase the robustness of those systems in critical domains. Deep learning algorithms have proven to be brittle against adversarial attacks. That is, carefully crafted adversarial inputs can consistently trigger an erroneous prediction from a network model. Hence the motivation of this dissertation, we study prominent adversarial …

Non-Binary Identities: How Non-Binary People Move Through A Gendered World, Carly E. Kupper

Honors Undergraduate Theses

The following study examines the experiences of non-binary people living in a society that emphasizes a gender binary, along with how being non-binary affects participants' views of the world and themselves. The study also looked to establish a working definition of "non-binary." I interviewed 17 participants who self-identified as non-binary regarding their lived experiences as non-binary people. Narratives were used to establish codes and themes. Adopting a narrative approach to the data, the study puts forth working definitions of non-binary and related terms, such as gender non-conforming, androgyny, and genderfluid. The study found that most participants saw themselves as breaking …

Stance And Engagement In Scientific Research Articles, Caoyuan Ma

Electronic Theses and Dissertations, 2020-2023

Stance and engagement are important rhetorical resources for writers to construct interaction with readers and ideas by marking epistemic evaluation and bringing readers into the texts. Building on previous research that suggests notable differences in the use of stance and engagement in academic discourse, this comparative study investigates the use of stance and engagement in scientific research articles. By comparing two corpora that contain 144 research articles in total across 16 scientific disciplines, this study examines if the numbers of stance and engagement differ between manuscripts (unpublished research papers) that are produced by nonnative writers and those that are published …

Student Government: A Phenomenological Study Of Student Government Leaders, K. Bonnieblue Rodríguez-Valentín

Electronic Theses and Dissertations, 2020-2023

This phenomenological study investigated the transition process of student government leaders in a university setting. The study consisted of interviewing a total of 17 participants from Executive, Judicial, and Legislative branches, as well as the Election Commission. This study focused on finding the types of transitions student leaders experience while serving in student government, the meaning obtained from such transitions, and the impact succession planning and university personnel had on those transitions. Themes that emerged from the study included stress, conflict, advocacy, resiliency, and boundaries. Recommendations and future applications of the research findings were made to help guide higher education …

Library-Sourced Etextbook Survey Questions, Lily Dubach, Penny Beile, Sara Duff, Rich Gause, Amanda Walden

Faculty Scholarship and Creative Works

This survey was utilized in a study exploring student success metrics and how the students used and perceived a library-sourced eTextbook for a Medical Terminology course in Fall 2021. The survey was adapted from Beile, deNoyelles, and Raible's 2020 study Analysis of an Open Textbook Adoption in an American History Course: Impact on Student Academic Outcomes and Behaviors.

The Effect Of Covid-19-Related Stress On Registered Nurses In The United States, Samantha Jacqlyn Genova

Honors Undergraduate Theses

The United States, as of October 2021, is the country with the most reported COVID-19 cases and COVID-19 deaths in the world. Since the first case was confirmed, Registered Nurses working in the acute care setting have been at the forefront of this public health crisis. As the pandemic has continued, studies have been conducted to collect, analyze, and reveal the effect of COVID-19-related stress on Registered Nurses in the United States. This critical literature review takes eleven published studies related to this topic, discusses the commonalities between them, addresses limitations in the literature and offers recommendations for future research. …

Facilitation Of Enviromental Factors To Reduce Sound Decibels In The Neonatal Intensive Care Unit: A Literature Review, Cassandra Hanlon

Honors Undergraduate Theses

This literature review investigates nursing interventions to reduce decibel levels in the neonatal intensive care unit (NICU). The secondary purpose of this review was to evaluate if the interventions to reduce noise in the NICU had different outcomes for normal weight premature infants and infants afflicted with neonatal abstinence syndrome. The data bases for completing this review were Google Scholar, the Cumulative Index to Nursing and Allied Health Literature (CINAHL Plus), PubMed, and Elton B. Stephens Co. (EBSCO). The key search words included ‘NICU and decibels', ‘reducing decibels', ‘neonatal abstinence syndrome' ‘decibels', ‘preterm infants' and 'normal weight preterm infant*'. The …

Race-Based Adjustment In Egfr Algorithms: An Integrative Literature Review, Leah E. Utt

Honors Undergraduate Theses

Background: There is a 3-fold risk of developing end stage kidney disease in Non-Hispanic African Americans compared to Non-Hispanic White Americans (Centers for Disease Control and Prevention, 2017). Estimated glomerular filtration rate (eGFR), one of the fundamental algorithms for coordinating treatment for kidney disease which factors in age, race, gender, and levels of creatinine, may pose an issue in this vulnerable population. Currently African Americans receive a correction factor between 1.21 and 1.16 to their eGFR to adjusting the value higher, potentially impacting appropriate kidney disease classification, and delaying beneficial interventions (National Kidney Foundation, 2020).

Methods: A systematic literature search …

Polymer-Based And Functionalized 3d Microelectrode Array (Mea) Biosensors, Nilab Azim

Electronic Theses and Dissertations, 2020-2023

Microphysiological systems are three-dimensional (3D) in vitro systems that recapitulate crucial biological aspects of cell heterogeneity and native tissue architecture by mimicking complex structures that are impossible in two-dimensional (2D) cell cultures. Microelectrode arrays (MEAs) are biosensors used to spatially and temporally monitor the activity of microphysiological systems by transducing cellular signals into electronic signals to provide quantitative data on the in vitro system. Conventional MEAs are typically planar in nature, however, 3D MEAs offer several advantages such as better simulation of an in vivo cellular environment and improved signal-to-noise ratio and cell-electrode coupling. MEA fabrication utilizing traditional cleanroom methods …

A Breathing Intervention To Enhance Cardiac Regulation And Mitigate Stress In Police Cadets, Samantha Napier

Electronic Theses and Dissertations, 2020-2023

Maintaining effective performance under stress can be challenging, especially in the dangerous environments encountered by the police and military personnel. This document reviews the impact of stress on performance, discusses breath interventions as a means of stress mitigation, suggests an approach for exploring the value of a breath intervention in police cadets, tests, analyzes, and discusses a test of this method and results. Biofeedback training can be used to produce resonance breathing that is synchronized with heart rate and optimizes heart rate variability (HRV). This intervention was expected to alleviate physiological and subjective stress responses. Studies reviewed confirm that higher …

Documenting Outdoor Simulated Scenes With Photogrammetry: Methods For Improving Dappled Lighting Conditions, Caroline Jasiak

Electronic Theses and Dissertations, 2020-2023

The primary goal of a forensic archaeologist is to reconstruct the context of scenes involving skeletal remains using recording and mapping methods. However, the outdoor locations of most forensic archaeology scenes can result in difficulties when recording and mapping scenes. While close-range photogrammetry (CRP) has been considered for documenting context of forensic sciences, this method lacks a sufficient procedural basis to guide data recording when encountering problematic environmental conditions. The purpose of this research is to test how light correction tools, a sheet and artificial lights, could improve harsh lighting conditions. Photographs were taken of controlled scenes with skeletal remains …

Spermidine Rescued Ptpn2/22 Function In Crispr-Cas9-Edited T-Cells With Ptpn2/22 Snps Linked To Crohn's Disease And Rheumatoid Arthritis, Ameera Shaw

Electronic Theses and Dissertations, 2020-2023

Inflammatory autoimmune diseases like Crohn's Disease (CD) and Rheumatoid Arthritis (RA) share some of the same single nucleotide polymorphisms (SNPs) in protein tyrosine phosphatase non-receptor types 2 and 22 (PTPN2/22), which contribute to their pathogenesis. In clinical CD and RA samples, PTPN2:rs478582 and PTPN22:rs2476601 were found to exacerbate a number of inflammatory processes associated with CD and RA. To confirm the role of these SNPs in CD and RA pathogenesis, CRISPR-Cas9 was used to induce the SNPs in T-cells. Cells were also treated with the naturally occurring polyamine, spermidine, to restore PTPN2/22 function and reverse the inflammatory effects of the …