Digital Commons Network^™

Methods For Defending Neural Networks Against Adversarial Attacks, Sharvil Shah

Electronic Theses and Dissertations, 2020-2023

Convolutional Neural Networks (CNNs) have been at the frontier of the revolution within the field of computer vision. Since the advent of AlexNet in 2012, neural networks with CNN architectures have surpassed human-level capabilities for many cognitive tasks. As the neural networks are integrated in many safety critical applications such as autonomous vehicles, it is critical that they are robust and resilient to errors. Unfortunately, it has recently been observed that deep neural network models are susceptible to adversarial perturbations which are imperceptible to human vision. In this thesis, we propose a solution to defend neural networks against white box …

Algorithms For The Detection Of Resolved And Unresolved Targets In The Infrared Bands, Bruce Mcintosh

Electronic Theses and Dissertations, 2020-2023

This dissertation proposes algorithms for the detection of both resolved and unresolved targets in the infrared bands. Recent breakthroughs in deep learning have spurred major advancements in computer vision, but most of the attention and progress has been focused on RGB imagery from the visual band. The infrared bands such as Long Wave Infrared (LWIR), Medium Wave Infrared (MWIR), Short Wave Infrared (SWIR) and Near Infrared (NIR) each respond differently to physical phenomena, providing information that can be used to better understand the environment. The first task addressed is that of detecting vehicles in heavy clutter in MWIR imagery. A …

Visual Question Answering: Exploring Trade-Offs Between Task Accuracy And Explainability, Aisha Urooj

Electronic Theses and Dissertations, 2020-2023

Given visual input and a natural language question about it, the visual question answering (VQA) task is to answer the question correctly. To improve a system's reliability and trustworthiness, it is imperative that it links the text (question and answer) to specific visual regions. This dissertation first explores the VQA task in a multi-modal setting where questions are based on video as well as subtitles. An algorithm is introduced to process each modality and their features are fused to solve the task. Additionally, to understand the model's emphasis on visual data, this study collects a diagnostic set of questions which …

Computational Methods To Analyze Next-Generation Sequencing Data In Genomics And Metagenomics, Saidi Wang

Electronic Theses and Dissertations, 2020-2023

This thesis focuses on two important computational problems in genomics and metagenomics with the public available next-generation sequencing data. One is about gene regulation, for which we explore how distal regulatory elements may interact with the proximal regulatory elements. The other is about metagenomics, in which we study how to reconstruct bacterial strain genomes from shotgun reads. Studying gene regulation, especially distal gene regulation, is important because regulatory elements, including those in distal regulatory regions, orchestrate when, where and how much a gene is activated under every experimental condition. Their dysfunction results in various types of diseases. Moreover, the current …

Characteristics Of Rotating Detonation Engines For Propulsion And Power Generation, Robert Burke

Electronic Theses and Dissertations, 2020-2023

Conventional engines are limited by the efficiency of their combustion mode. Compared to present constant pressure deflagration-based engines, detonation-based systems can realize a higher thermodynamic cycle efficiency, making them an attractive candidate for next generation propulsion systems that will take humanity to hypersonic speeds and even to Mars. For all its performance gains, detonation engines are still far off from implementation. One system, the rotating detonation engine (RDE) is promising as a detonation-based engine concept for its stability, simplicity, and versatility. For these reasons, RDEs have been the subject of studies internationally in efforts to understand their operation and integration …

A Human-Centered Approach To Improving Adolescent Online Sexual Risk Detection Algorithms, Afsaneh Razi

Electronic Theses and Dissertations, 2020-2023

Computational risk detection has the potential to protect especially vulnerable populations from online victimization. Conducting a comprehensive literature review on computational approaches for online sexual risk detection led to the identification that the majority of this work has focused on identifying sexual predators after-the-fact. Also, many studies rely on public datasets and third-party annotators to establish ground truth and train their algorithms, which do not accurately represent young social media users and their perspectives to prevent victimization. To address these gaps, this dissertation integrated human-centered approaches to both creating representative datasets and developing sexual risk detection machine learning models to …

Examining Cooperative System Responses Against Grid Integrity Attacks, Alexander D. Parady

Honors Undergraduate Theses

Smart grid technologies are integral to society’s transition to sustainable energy sources, but they do not come without a cost. As the energy sector shifts away from a century’s reliance on fossil fuels and centralized generation, technology that actively monitors and controls every aspect of the power infrastructure has been widely adopted, resulting in a plethora of new vulnerabilities that have already wreaked havoc on critical infrastructure. Integrity attacks that feedback false data through industrial control systems, which result in possible catastrophic overcorrections and ensuing failures, have plagued grid infrastructure over the past several years. This threat is now at …

Thrust Augmentation Of Rotating Detonation Rocket Engines, Alexander G. Rodriguez

Honors Undergraduate Theses

This thesis aims to perform a detailed analysis on a 5th Order Polynomial Nozzle, verifying its effectiveness in improving the thrust performance of a Rotating Detonation Rocket Engine. Rotating detonation engines are a promising engine type that uses detonations as a means of combustion rather than traditional conflagration. Through this method, these engines can produce significant amounts of energy while burning less fuel in the process. However, exhaust flow instabilities and swirl limit the engine's potential for use as a means of propulsion. The 5th Order Polynomial Nozzle was previously demonstrated to reduce and control this swirl; however, analysis was …

An Introduction To The Comparison Of Seismocardiography And Phonocardiography, Anna C. Voyatzoglou

Honors Undergraduate Theses

The intent of this thesis is to lay groundwork for examining the relationship between seismocardiography (SCG) and phonocardiography (PCG). Both are methods of measuring and describing heart mechanical function. SCG is described as chest vibrations while the heart beats, and PCG is described as acoustic chest surface signal believed to represent the heart valves opening or closing. SCG and PCG have both been used separately in clinical and research settings, but there is currently no clear comparison between the two. Therefore, there has been no way at the present to understand how one signal might inform the other. This study …

Design And Development Of Medical Devices For Multifaceted Applications, Madisyn Messmore

Honors Undergraduate Theses

The fields of biotechnology and biomedical sciences are rapidly evolving and involve the constant growth of knowledge. As a consequence, engineering design has to also remain at the cutting edge in order to not inhibit the growth of these fields. This study focuses on engineering design and analysis as it pertains to the field of biotechnology, at every step of the engineering process. More specifically, how the engineering design and analysis approach can assist in solving medical problems relating to bone diseases and biomaterials. The first part of the study focuses on a project to design and manufacture a novel …

Distance Perception Through Head-Mounted Displays, Sina Masnadi

Electronic Theses and Dissertations, 2020-2023

It has been shown in numerous research studies that people tend to underestimate distances while wearing head-mounted displays (HMDs). We investigated various possible factors affecting the perception of distance is HMDs through multiple studies. Many contributing factors has been identified by researchers in the past decades, however, further investigation is required to provide a better understanding of this problem. In order to find a baseline for distance underestimation, we performed a study to compare the distance perception in real world versus a fake headset versus a see-through HMD. Users underestimated distances while wearing the fake headset or the see-through HMD. …

Electrode Evaluation And Electrocortical Dynamics Of Adapting To Small Perturbations During Treadmill Walking, Jinfeng Li

Electronic Theses and Dissertations, 2020-2023

Mobile brain-body imaging (MoBI) seeks to understand human brain and body dynamics during movement and locomotor tasks such as walking with perturbations that challenge balance and lead to adaptation of walking behavior. In this dissertation, I evaluated the long-term electromyography (EMG) recording performance of dry epidermal electrodes for measuring electrical muscle activity. I also evaluated the relationships between the signals recorded from the two sides of dual-sided electroencephalography (EEG) electrodes, a recent advancement in EEG electrode design for measuring electrical brain activity. Last, I investigated adaptation of brain and body responses to small and frequent perturbations during treadmill walking while …

Complex Quantum Contagion: A Quantum-Like Approach For The Analysis Of Co-Evolutionary Dynamics Of Social Contagion, Ece Mutlu

Electronic Theses and Dissertations, 2020-2023

Modeling the dynamics of social contagion processes has recently attracted a substantial amount of interest from researchers due to its wide applicability in network science, multi-agent systems, information science, and marketing. Unlike in biological spreading, the existence of a reinforcement effect in social contagion necessitates considering the complexity of individuals in the systems. Although many studies acknowledged the heterogeneity of the individuals in their adoption of information (or behavior), there are no studies that take into account the individuals' uncertainty during their decision-making despite its theoretical and experimental evidence in behavioral economics, decision science, cognitive science, or multi-agent systems. This …

A Contingent Approach To Studying Technical Programs In The Public Aerospace Industry, Laura Segarra

Electronic Theses and Dissertations, 2020-2023

Bibliometric evaluation of the literature indicates that a unified theory of program management does not yet exist. The vastly different definitions and implementations of programs across organizations and industries indicate that program management as an organizational concept is not well understood. As researchers have tried to make sense of various perspectives and definitions, it becomes clear that different kinds of programs exist, and further attention to their context is needed. While relationships between structural and environmental variables have been extensively researched in organizational studies, studies in program management are scant, lack incorporation of environmental variables relevant to programs and projects, …

An Exploratory Assessment Of Small Group Performance Leveraging Motion Dynamics With Optical Flow, Joshua Desantiago

Electronic Theses and Dissertations, 2020-2023

Understanding team behaviors and dynamics are important to better understand and foster better teamwork. The goal of this master's thesis was to contribute to understanding and assessing teamwork in small group research, by analyzing motion dynamics and team performance with non-contact sensing and computational assessment. This thesis's goal is to conduct an exploratory analysis of motion dynamics on teamwork data to understand current limitations in data gathering approaches and provide a methodology to automatically categorize, label, and code team metrics from multi-modal data. We created a coding schema that analyzed different teamwork datasets. We then produced a taxonomy of the …

Generic Behavior Framework Of Sx And Ds Nickel-Base Superalloys With Applications To Constitutive And Life Prediction Modeling, Firat Irmak

Electronic Theses and Dissertations, 2020-2023

Selection of materials to be used for components experiencing extreme conditions is a critical process in the design phase. Nickel-base superalloys have been frequently used for hot gas path components in the turbomachinery industry. These components are required to withstand both fatigue and creep at extreme temperatures during their service time. In general, the extreme temperature materials mostly embody polycrystalline, directionally solidified, and single crystal superalloys. It is essential for design engineers to predict accurate damage behavior and lifespan for these components to prevent catastrophic failures. This dissertation presents a new framework to represent mechanical behavior of Nickel-base superalloys under …

On Your Painted Wings, Sandra M. Ford

Honors Undergraduate Theses

The intent of this thesis is to explore historical issues of Cuban restrictions on emigration through a magical realism lens. Drawing inspiration from Cuban-American writer Ana Menéndez and Columbian writer Gabriel García Márquez, this thesis focuses on family relationships, especially how grief shapes those relationships and the people in them. The thesis approaches these issues of family, grief, and Cuban emigration by weaving a more grounded central narrative with an original fairytale.

Transformations Of Hanbok In The Age Of Hallyu: Fashion, Cultural Hybridization, And The Construction Of Vernacular Korean Nationalism, Katharine V. Smith

Honors Undergraduate Theses

Hanbok is the traditional fashion of South Korea, and literally translates to “Korean clothing.” Once worn every day, today hanbok is reserved for special occasions and holidays; however new “modern” versions of the attire are becoming more and more popular for everyday wear. This new iteration of the traditional clothing created a new vernacular of Korean nationalism and “Koreanness” through the incorporation of modern fashion trends and traditional Korean aesthetics. Modern hanbok represents the unique relationship between nationalism, globalization, and fashion, and can be seen as an example of cultural hybridization. Looking at modern hanbok through the lens of Hallyu, …

Good Patients, Susan Mesler-Evans

Honors Undergraduate Theses

This thesis is the first 21 chapters (approximately 150 pages) of a novel, Good Patients, accompanied by a complete synopsis. Good Patients is a social satire which seeks to touch on the flaws of the American healthcare system and social media culture, and how these two intersect for many people. To prepare for writing, I spent my first semester completing a guided reading list and preparing the synopsis, both of which were approved by my thesis chair. While writing, I consulted several medical articles to make my work as accurate as possible. The novel explores the way social media …

The Concept Of Grief: A Phenomenological Account With Continual Reference To Kierkegaard, Nathan Sweetman

Honors Undergraduate Theses

My thesis argues that Søren Kierkegaard provides a perspective on grief that validates emotional experience while offering the opportunity for transcendence beyond the immediacy of grief through the work of love in recollecting one who is dead. Conventional philosophical approaches offer an incomplete picture by focusing on grief either as exclusively emotional or exclusively moral. The alternative methodology of phenomenology serves to draw out common threads from the intensely subjective, inward experience of grief. Kierkegaard’s writings on the topics of grief, sorrow, and love for the dead reflect the complexity uncovered in the phenomenological analysis. Traditional interpretations of Kierkegaard’s call …

Negative Space: The Transference Of Trauma, Jeremy Robinson

Electronic Theses and Dissertations, 2020-2023

Is trauma tangible? My thesis will examine my experiences with trauma and the influence it has on my practice as a visual artist. I define trauma as the reaction to physical and emotional experiences of distress, abuse, and neglect, that invaded mind and body. My traumatic memories remain subconsciously hidden, an instinctive 'survival instinct' failsafe ingrained into my psyche, that files away many unbearable experiences, only to be evoked and experienced in the present by a trigger. For me, domestic space is often that trigger. Throughout the reflective analysis of my childhood traumas, I showcase the allegorical stories, signifiers and …

Online Engagement In Graduate Technical Communication Education, Tabatha Kless

Electronic Theses and Dissertations, 2020-2023

In this study, I conducted a content analysis to investigate engagement in online graduate technical communication programs. I wanted to evaluate this topic because online learning and engagement evolve, so it is fitting to evaluate how educational policies, learning methods, and technology have developed in technical communication education. The content analysis consisted of coding course material from three technical communication courses, mostly assignment descriptions, and instructions based on the language in the documents. I found strategies that develop skills 21st century technical communicators should have, such as discussions, service learning, and research papers.

Stress, Coping, And Disease Awareness With Metabolic Disease Risk: A Longitudinal Cohort Study, Chelsea Anestal

Honors Undergraduate Theses

College students undergo stressors (e.g., potential financial strain, changes in workload or location), which may precipitate metabolic syndrome (MetS) risk associated with obesity and high blood pressure. Concerning rises in young adult obesity and type 2 diabetes, prompt study into MetS risk factor prevalence and awareness in youthful populations transitioning to new environments, such as college. This study assessed perceived stress, coping resources, and disease awareness differences in the first time on campus and final-year students associated with MetS risk factors (elevated body mass index (BMI) and blood pressure). We hypothesized lower stress perception, lower weight gain and blood …

Computational Strain Analysis In Microbiome Datasets With Application To Skin Disease, Minerva Fatimae Ventolero

Electronic Theses and Dissertations, 2020-2023

Identifying bacterial strains is important not only for human health research but also for various environmental and industrial applications. The plethora of available shotgun metagenomic datasets provide an unprecedented opportunity to discover novel bacterial strains in different environmental niches. In this thesis, we evaluated the existing novel-strain-based tools and showed that their performance is still suboptimal. Due to the difficulty in distinguishing strains of similar abundance by available tools, the SMS (strains in multiple samples) tool was developed to de novo identify bacterial strains in multiple shotgun metagenomic samples. We showed that SMS distinguishes strains of similar abundance well and …

A Qualitative Analysis Of Hospital Nurses' Experiences During The Covid-19 Pandemic Through The Lens Of The Demand-Control-Support Model, Alisha Garner

Honors Undergraduate Theses

Positive social support, realistic job demand, and appropriate levels of control over their responsibilities can mitigate empathy fatigue and burnout among nurses, increase quality care for patients, and lay the foundation for teams to embrace challenges during crises. The COVID-19 pandemic stretched nurses in all these areas, leading many nurses to contemplate changing fields. Failure to address and embrace the difficulties that nurses face during such crises can result in loss of nurses and impact the entire healthcare industry.

The present study used one-to-one interviews to glean insider perspectives of changes in job demand, control, and support nurses experienced as …

Exploring Career Development Pathways In Postsecondary Film Studies Programs, Cesare Giovanni Fabietti

Honors Undergraduate Theses

This study sought to determine what factors could impact career development pathways for postsecondary film studies through survey research. The selected determining factors that offered eventual success as a filmmaking professional were students' personality characteristics and unique, innate abilities. The survey questions polled film study educators whose primary contact with film students was at college-level classrooms and could offer significant opinions about the factors measured. Only those educators with demographic characteristics that dealt with actual filmmaking procedures of production and post-production gave a measurable statistical result related to a single dependent variable. The differentiator between filmmaking disciplines was distinguished by …

Design And Testing Of A Hybrid Direct Ink Writing And Fused Deposition Modeling Multi-Process 3d Printer, Alexander X. Losada

Honors Undergraduate Theses

Multi-material 3D Printing allows the ability to fabricate parts with tuned mechanical properties, multi-process 3D printing widens the choices of available fabrication materials. The objective of this study is to build a custom 3D printing test bed that is capable of printing multi-material parts with fused deposition modeling and direct ink writing techniques. A 3D printer, controlled by an industrial motion control system, with FDM and DIW capabilities was built by combining FDM extruders with a pneumatic dispensing system on a single platform. By utilizing the Direct Ink Writing function, we expand the number of printable materials to include some …

Characteristics Of Covid-19 Vaccine-Hesitant Ucf College Students And Potential Avenues For Increasing Vaccination Rates, Justin A. Barthel

Honors Undergraduate Theses

The COVID-19 pandemic has been an ongoing disaster that has devasted millions of lives. With the development of COVID-19 vaccines in late 2020, there was a potential for populations to gain artificial active immunity in order to prevent future outbreaks. However, despite successful clinical trials, millions of citizens have been hesitant to receive the COVID-19 vaccines (Khubchandani et al., 2021). Demographics of the most prominent US vaccine-hesitant populations consist of ethnic/racial minorities and Republicans groups (Khubchandani et al., 2021). Little information is known about COVID-19 vaccine hesitancy in colleges and universities. Colleges provide an elevated risk for infection through their …

A Systematic Review And Meta-Analysis Of The Relationship Between The Creb Protein's Neuroplastic Functions And The Implications In Neurodegenerative Diseases: A Possible Link Between Synaptic Plasticity And Neurodegenerative Diseases, Mani Sarmast

Honors Undergraduate Theses

In this two-part study, I investigated whether the cyclic-adenosine monophosphate response element-binding (CREB) protein has the potential to be clinically modulated as a therapeutic target for the treatment of neurodegenerative diseases. Part one consisted of a systematic review that was conducted on select articles gathered through a stepwise method to explore (1) the relationship between diseased, neurodegenerative brains and levels of active, phosphorylated CREB (pCREB), (2) increased activation of CREB as a treatment for neurodegenerative symptoms, and (3) a potential therapeutic drug for neurodegenerative diseases that can target CREB signaling. The results of the systematic review showed evidence that suggested …

In The Attic Of A Barn, Hunter Pylant

Electronic Theses and Dissertations, 2020-2023

I create wooden and metal sculptures that are abstractions of old memories that examine, celebrate, and embody my rural culture, upbringing, and heritage. I aim to honor my family's memory and keep their passion for craft alive through working with the tools that have been passed down from them. When I find myself struggling in life I always look to my personal history to find answers. I am reminded of my family's rural and military backgrounds and of the tradespeople from my family: carpenters, blacksmiths, farmers, and soldiers. Through their chosen trades and tools, generations from my family were able …