Digital Commons Network^™

Passperfect: A Secure One Time Password Authentication System, Charlene H. Crawshaw

UNF Graduate Theses and Dissertations

Most organizations have established strong password policies and standards to ensure the confidentiality, integrity, and availability of their data, applications, and critical systems. Even with rigorous implementations and layered approaches such as utilizing multifactor authentications, there are still flaws and vulnerabilities as they have a high dependency on the user adhering to them. In conjunction with these policies, a strong security awareness program should be implemented to educate the end user about strong password hygiene. In this work, we design and implement a secure one-time password (OTP) system, “PassPerfect”, to provide a method of enforcing a strong set of password …

Florida Queer K12 Teachers Perceptions Of School Climate Under “Don’T Say Gay”, Katherine E. Foley

UNF Graduate Theses and Dissertations

Florida's newest legislation leaves many Florida queer teachers feeling marginalized and unprotected in the classroom (Block, 2022). The “Parental Rights in Education” Bill (FL HB 1557 and FL HB 1069), infamously renamed “Don’t Say Gay”, was created ostensibly to help protect parental rights and choices in education. The new law prohibits the discussion of gender identity and sexual orientation in kindergarten through twelfth grade classrooms. “Don’t Say Gay” provides vague guidelines for queer teachers on approaching topics like sexual orientation and gender identity. Despite the evidence that queer teachers who are open and honest about their identity often find themselves …

Why Equity Follows The Law, Adam J. Macleod

Scholarly Articles

Renewed attention to equity in higher education is welcome because true equity helps us to reason together well. When administered correctly, the jurisprudence of equity models civil discourse and, therefore, can teach us how to carry out civic engagement reasonably. Equitable interpretation of the law teaches us how to understand each other charitably. And equity’s deference to law teaches us how to reason well together about our practical problems. Law is the practical reasoning that we do together. Equity serves the ends of justice by serving law, rather than undermining it. These functions of equity in adjudication point toward a …

Breach Of Faith: The Special Problem Of Osha Performance Standards, Marshall J. Breger, Arthur G. Sapper

Scholarly Articles

This Article focuses on a special problem with performance standards - that their performance criteria are often so subjective as to deny regulated persons a clear idea of what is required. It begins with a discussion of specification and performance standards in American regulatory history. It further discusses attempts by Congress and others to, therefore, require that performance criteria be “objective.” The Article then sets out a case study of how congressional attempts to require “objective” performance criteria have fared. It examines in depth whether one agency, the Occupational Safety and Health Administration (OSHA), has complied with that special requirement …

"Appropriate" Appropriations Challenges After Community Financial, Chad Squitieri

Scholarly Articles

The standard federal agency must come to Congress each year, hat in hand, and request another round of congressional funding. This annual appropriations process ensures that Congress maintains at least some influence over the vast array of rules and regulations that govern Americans' daily lives. Sure, Congress might have delegated broad authority to administrative agencies to develop national policy on Congress's behalf. But an agency reliant on annual appropriations is an agency with the financial incentive to exercise its delegated authority with an eye toward pleasing congressional appropriators. The annual appropriations process is therefore a sensible (even if insufficient) step …

Group Ownership And The Ends Of Legal Fictions, Adam J. Macleod

Scholarly Articles

The march of the progressive societies was, as we all know, from status to contract. And now? And now that forlorn old title is wont to introduce us to ever new species and new genera of persons, to vivacious controversy, to teeming life; and there are many to tell us that the line of advance is no longer from status to contract, but through contract to something that contract cannot explain, and for which our best, if an inadequate, name is the personality of the organized group.

An Examination Of Scientific And Technical Communication For Forensic Engineering And Forensic Pathology., Tori C. Reeder

Dissertations, Master's Theses and Master's Reports

Police communication sits at the unique intersection of risk communication, scientific and technical communication, and medical communication, as we see in forensic reports. In this dissertation, I examine the communicative underpinnings of forensic pathology and forensic engineering reports. I argue that there is not only an inherent link between the unpredictability of a written text and the reception of said text by both its intended and unintended audience, but also a link to the broader socio-cultural contexts. I will examine an atypical forensic pathology report (autopsy report) of George Floyd, a more standard forensic pathology report of an inmate who …

“Not Much Of A Job”: Everyday Life And Labor At Camp Au Train, Josef T. Iwanicki

Dissertations, Master's Theses and Master's Reports

In this thesis, I use data from Camp Au Train, a Civilian Conservation Corp camp in Michigan’s Hiawatha National Forest, as a case study to connect the everyday life of enrollees with dominant government narratives while including a focus on labor and the capitalist crisis of the Great Depression. Using the vantage point of work, play, study, and health, I integrate archaeological, historic, and photographic evidence to show contradictions between the enrollees’ real lived experience and the dominant perspectives of the CCC ‘authorities’ who organized their lives. I argue that to interpret these contradictions, the CCC needs to be connected …

Using A Reverse Visually Guided Reaching Task To Distinguish Between Healthy Aging And Early Alzheimer’S Disease, Brandon Woolman

Dissertations, Master's Theses and Master's Reports

Changes in motor behavior may function as a proxy for cognitive decline. While Alzheimer's disease (AD) is associated with impairments in learning and memory, recent studies suggest that subtle changes in motor task performance may reflect early cognitive changes. For example, the visuomotor rotation task that manipulates visual feedback about hand position during reaching movements, can be used to examine cognitive changes in aging populations. The current study used the reverse visually guided reaching task (rVGR) which rotates visual feedback of participant’s hand position 180⁰ relative to the actual hand position. We sought to expand on previous literature by recruiting …

Chemical Synthesis Of Sensitive Dna, Komal Chillar

Dissertations, Master's Theses and Master's Reports

Over the past decades, researchers have tried various chemical methods to synthesize modified oligodeoxynucleotides (ODNs, i.e. short segments of DNAs). Traditional ODN synthesis methods require strong basic, and nucleophilic conditions for the deprotection and cleavage of the ODN from the solid support. However, the sensitive ODNs containing labile functionalities are vulnerable to such harsh conditions. Sensitive ODNs have a wide range of applications in research and pharmaceuticals. To synthesize sensitive ODNs, researchers devised different strategies but no practical methods have been developed. To overcome these challenges, we developed alkyl Dim alkyl Dmoc technology. This innovative technology uses weakly basic and …

An Elasto-Plastic Constitutive Model With Phase-Field Fracture For Additively Manufactured Metallic Materials, Nolan Ruble

Dissertations, Master's Theses and Master's Reports

The advent of additive manufacturing (AM), commonly known as 3D printing, has revolutionized the production of metallic components across various industries. This technology, which builds objects layer by layer, has shifted paradigms in manufacturing, allowing for unprecedented design freedom, material efficiency, and rapid prototyping. Metal additive manufacturing, in particular, has shown remarkable promise due to its ability to produce complex geometries that are difficult or impossible to achieve with traditional subtractive methods. In addition, additively manufactured (AM) materials are gaining popularity in thanks to their often superior and controllable properties in comparison to their wrought counterparts. In the present work, …

Performance Characterization And Optimization Of A Point-Cloud-Based Path Planner In Off-Road Terrains, Casey D. Majhor

Dissertations, Master's Theses and Master's Reports

In this dissertation, I present a multifaceted study on the generation of artificial terrains using a multifractal method, and their use in autonomous ground vehicle (AGV) planning and navigation performance characterization in high-fidelity simulations, and automated parameter optimization.

My first contribution is a multifractal artificial terrain generation method leveraging the 3D Weierstrass-Mandelbrot function to control terrain roughness. We generate 60 unique off-road terrains while varying the fractal dimension and test the impact on vehicle traversal difficulty. Results show that increasing the fractal dimension decreases low-roughness areas, increases semi-rough and high-roughness areas, and decreases vehicle success rates while increasing vertical accelerations, …

Modeling Pulsatile Flows Using Truly Incompressible Finite Volume Lattice Boltzmann Model, Akshay S. Dongre

Dissertations, Master's Theses and Master's Reports

The present study addresses the compressibility error inherent in the standard Lattice Boltzmann Method (LBM) and LBM’s restriction to uniform Cartesian meshes. To mitigate the compressibility error, an incompressible LBM (iLBM) model has been incorporated into the finite volume framework using a cell-centered finite volume approach, leveraging the simplicity of the LBM algorithm for irregularly shaped flow domains with unstructured meshes. Monotonic Upstream-centered Scheme for Conservation Laws (MUSCL) and linear reconstruction (LR) schemes have been used to compute convective fluxes across the cell interfaces with boundary conditions implemented using the second-order accurate Non-Equilibrium Extrapolation (NEE) method.

The finite volume iLBM …

Sustainable Materials For Environment − Multifunctional Material Made From Dead Leaves And Nanostructured Materials For Antibiotic Degradation, Siyuan Fang

Dissertations, Master's Theses and Master's Reports

As environmental pollution from industrial processes and human activities continues to rise, finding efficient approaches to recycle waste materials and degrade persistent contaminants becomes increasingly critical. Dead leaves, an abundant but underutilized biomass, present an opportunity for creating value-added materials if their biocomponents can be preserved and transformed. Simultaneously, antibiotics such as tetracycline are widely found in water bodies but pose serious ecological and health risks, necessitating effective degradation methods. This dissertation addresses these challenges by leveraging natural and nanostructured materials to develop multifunctional products and advanced photocatalytic processes.

Chapter 3 of this dissertation addresses the challenge of converting waste …

Phase Field Modeling Of Fracture And Phase Separation Using Numerical Methods And Machine Learning, Revanth Mattey

Dissertations, Master's Theses and Master's Reports

Phase field modeling is a crucial tool in scientific and engineering disciplines due to its ability to simulate complex phenomena like phase transitions, interface dynamics, and pattern formation. It plays a vital role in understanding material behavior during processes such as solidification, phase separation, and fracture mechanics. Particularly in fracture mechanics, phase field modeling can be utilized to predict the crack path in complex materials. Understanding the failure behavior is vital for applications of any material. The specific contributions to the field of phase field fracture mechanics, are, Firstly, we propose a novel phase field fracture model to simulate the …

Investigating Microphysical Variability And Entrainment In Clouds Using Airborne Digital Holography, Machine Learning, And Large Eddy Simulations, Nithin Allwayin

Dissertations, Master's Theses and Master's Reports

Advancing our understanding of cloud microphysics—the processes governing cloud particles' formation, growth, and interactions—is essential for accurate weather and climate modeling. In this work, we investigate how droplet size distributions vary in a cloud and explore how microphysical properties such as droplet size and number concentration respond to entrainment and mixing.

In the first part of the work, a novel algorithm is developed combining hypothesis testing with density-based clustering to identify characteristic cloud droplet size distribution types in marine stratocumulus clouds. Applied to data from the airborne Holographic Detector for Clouds (HOLODEC), the algorithm successfully identifies a relatively small set …

Synthesis Of Long Oligodeoxynucleotides, Yipeng Yin

Dissertations, Master's Theses and Master's Reports

Synthetic long oligodeoxynucleotides (ODNs) have found wide applications in diverse fields such as chemical biology, synthetic biology, and genes and genomes synthesis. Those applications leading to a significant demand for their production. However, traditional methods for purifying synthetic ODNs present notable drawbacks, particularly their inability to purify long ODNs, rendering long ODN synthesis challenging. To address these issues, chemical synthesis techniques for long ODNs coupled with non-chromatographic purification methods have been developed. This technology makes the purification of long synthetic ODNs feasible and offers a viable pathway for producing genes and genomes with extensive repeats or stable secondary structures, which …

Understanding Catalyst Design Principles In Transition Metal Mixed Anionic Chalcogenides For Electrocatalytic Energy Conversion, Ibrahim Abdullahi

Doctoral Dissertations

"This research focused on the synthetic design of transition metal mixed anionic chalcogenide catalysts containing various ligand types around the central metal atom (chalcogen anion and chalcogen-based organic ligand) generating diverse crystal structure types applied for water splitting and carbon dioxide reduction reactions (CO₂RR).

A series of catalysts were synthesized starting with isolated metal complexes (ME_n) with a central metal core (M = Co, Ni, Cu, and Cr) through molecular clusters, to bulk nanostructured solids of similar M-E coordination. Bis(dichalcogenoimidodiphosphinato) were employed as ligands in the metal complexes, and anionic chalcogen (E = S, Se, and …

Development And Testing Of High Strength Scalable High Entropy Alloys, Hans Jakob Pommerenke

Doctoral Dissertations

"High entropy alloys have shown promise through their ability to be tailored to specific scenarios. From highly corrosive environments to precipitation strengthened alloys to radiation environments high entropy alloys allow tailor made alloys for every solution. New compositions are developed and tested but little work focuses on the processing effect choosing rather than using processing as a steppingstone to achieve properties without investigating the processing effects. This work focuses on single phase face-centered cubic alloys strengthened by processing and precipitation strengthening. In conjunction with the development of these alloys, the ability to scale production will be investigated and characterized to …

Low-Shrinkage Fiber-Reinforced Concrete For Infrastructure Construction And Rehabilitation, Jingjie Wei

Doctoral Dissertations

"The aim of this study is to develop two classes of low-shrinkage high-performance concrete (HPC): fiber-reinforced super workable concrete (FR-SWC) for infrastructure construction and fiber-reinforced self-consolidating concrete (FR-SCC) for repair applications. HPC with excess content of shrinkage mitigation materials (SMMs), including shrinkage-reducing admixture (SRA), superabsorbent polymer (SAP), and expansive agent (EA) has a detrimental effect on mechanical performance. These classes of HPC were optimized to reduce shrinkage, enhance mechanical properties, and improve durability. The effect of fiber type (macro synthetic fiber, MSF; 5D steel fiber, 5D; 80% 3D + 20% short steel fibers; STST), SMMs, and plastic viscosity on bond …

Additive Manufacturing Of Steel And Aluminum Structures: Modeling And Experiments, Manoj Kumar Reddy Rangapuram

Doctoral Dissertations

"Additive manufacturing (AM) is defined as the process of joining materials to make objects from three-dimensional model data. Complex geometries can be easily manufactured compared to conventional subtractive methods with more freedom and flexibility in the design process. As the demand for AM process increased, it has become critical to understand the process and various parameters that constitute in affecting the quality of the manufactured part. Conducting experiments can be time intensive and costly to optimize a process. Modeling can be used as an aid to optimize, examine, and predict the process outcome.

The objective of this study is (i) …

Torture And Trolleys: Accepting The Nearly Absolute Wrongness Of Philanthropic Torture Of A Perpetrator, David Jensen

Faculty Publications

One potentially morally justified use of torture is found in philanthropic torture of a perpetrator (PTP): scenarios in which a perpetrator has instigated significant pending suffering against innocents and in which the suffering can be prevented by means of the perpetrator’s cooperation. These situations involve a clash of two intuitions: that torture is in some strong and obvious sense absolutely morally wrong, and that torture or harm of an immoral perpetrator may be permissible to prevent equally abhorrent, if not greater, moral wrongs. My view is that a dually grounded view—permissible on theoretical grounds but wrong on practical grounds—can do …

การตีความข้อยกเว้นด้านความมั่นคงมาตรา Xxi(B) ขององค์การการค้าโลก, นิธินันท์ ลีธนะกุล

Chulalongkorn University Theses and Dissertations (Chula ETD)

ข้อยกเว้นด้านความมั่นคงตามมาตรา XXI(b) แห่งความตกลงองค์การการค้าโลก (WTO) ทวีความสำคัญขึ้นในปัจจุบัน เนื่องจากประเทศสมาชิกนำมาใช้เป็นเครื่องมือจำกัดการค้าระหว่างประเทศมากขึ้น การศึกษานี้มุ่งวิเคราะห์การตีความและการบังคับใช้ข้อยกเว้นดังกล่าว โดยเปรียบเทียบกับบทบัญญัติมาตรการที่กระทำได้ (Non-Precluded Measures Clause: NPM) ในกฎหมายการลงทุนระหว่างประเทศ โดยตั้งสมมติฐานว่าการพิจารณาเพียงเงื่อนไขตาม (i)-(iii) ของมาตรา XXI(b) เป็นเกณฑ์ที่อาจทำให้ประเทศสมาชิกยกอ้างข้อยกเว้นความมั่นคงได้โดยง่ายเกินไป การศึกษาใช้วิธีวิจัยเชิงเอกสารโดยวิเคราะห์คำวินิจฉัยของคณะกรรมการระงับข้อพิพาทของ WTO คำชี้ขาดของคณะอนุญาโตตุลาการด้านการลงทุนระหว่างประเทศ ตลอดจนประวัติการเจรจาและวัตถุประสงค์ของมาตรา XXI ผลการศึกษาพบว่า WTO ยังขาดกฎเกณฑ์ที่ชัดเจนในการตรวจสอบการใช้ดุลพินิจของรัฐ แม้ไม่อาจนำกฎเกณฑ์ของกฎหมายการลงทุนระหว่างประเทศมาใช้โดยตรงเนื่องจากลักษณะธุรกรรมและความสัมพันธ์ที่แตกต่างกัน แต่มีส่วนที่สอดคล้องกันคือการใช้วลี "it considers necessary" ที่สะท้อนลักษณะบทบัญญัติแบบอัตวินิจฉัย (self-judging) ทั้งนี้ แนวปฏิบัติจากกฎหมายการลงทุนระหว่างประเทศสามารถนำมาประยุกต์ใช้ในการตรวจสอบการใช้ดุลพินิจของรัฐภายใต้กรอบ WTO ในส่วนของหลักสุจริตได้ อย่างไรก็ตาม ความกังวลสำคัญคือการใช้ข้อยกเว้นด้านความมั่นคงในทางที่ผิดอย่างต่อเนื่อง อาจทำให้ข้อยกเว้นกลายเป็นหลักปฏิบัติปกติ ซึ่งทำลายเจตนารมณ์ดั้งเดิมและส่งผลกระทบต่อเสถียรภาพของระบบการค้าระหว่างประเทศ การศึกษานี้จึงเสนอแนะให้พัฒนาแนวทางการตีความที่ชัดเจนขึ้น สร้างกลไกการตรวจสอบที่มีประสิทธิภาพ และสร้างความสมดุลระหว่างการคุ้มครองผลประโยชน์ด้านความมั่นคงของรัฐและการรักษาเสถียรภาพของระบบการค้าระหว่างประเทศ

Disciplining The Responses To Cross-Border Subsidies: The Case Study Of Eu And Us Trade Remedy Investigations Against Products From Indonesia And Thailand, Jia Zhen Cen

Chulalongkorn University Theses and Dissertations (Chula ETD)

The geopolitical confrontation between the United States and China extends across various levels and domains, with trade being one of the most prominent arenas. Subsidies, a longstanding source of contention in international trade, have become an even more contentious issue following China’s launch of the Belt and Road Initiative (BRI) in 2013. Traditionally, subsidies are provided by a government to its domestic producers, and WTO subsidy rules allow its Members to take countervailing measures against subsidies of their direct trading partners when those subsidies cause injury to the Member's domestic industries. However, the rise in cross-border subsidies – where governments …

The Dynamics Of The Chana Community Network Movement: Strategic Shifts, Impacts, And Reflections On Thailand's Political Landscape, Abdullah Yuhannan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This dissertation examines the dynamics of the Chana Community Movement, one of Thailand’s most enduring grassroots movements. Originating in the early 1990s with opposition to illegal commercial fishing, the movement has evolved to resist the Chana Industrial Estate Project. The research addresses key questions concerning factors sustaining the movement, tactical adaptations, societal impacts, and its reflection of Thailand’s contemporary political landscape. The study employs a qualitative research methodology, combining document analysis, in-depth interviews, and participant observation, alongside analytical frameworks derived from political struggle studies and social movement theories for comprehensive analysis. The findings reveal that the Chana Community Movement succeeded …

Understanding Pluriversal Ontology: The Cases Of Three Alternative Agriculture Communities In Sisaket Province, Northeastern, Thailand, Thita Ornin

Chulalongkorn University Theses and Dissertations (Chula ETD)

In reaction to the global development paradigm, the concept of Pluriverse has played a pivotal role in exploring alternatives to development, aiming to foster a world that accommodates multiple worlding with the goals to facilitate various approaches to collective well-being, moving away from anthropocentric, linear growth within the modern capitalist development. This thesis seeks to understand alternative agriculture cases in the Northeast of Thailand through the Pluriversal ontology conceptual framework and to determine its usefulness through the following proposed framework; (1) alternative agricultural development discourse analysis, (2) friction and assimilation with modernity and (3) post-development values. Taken an inspiration from …

Thailand's Never-Ending Pesticide Debate: Contested Future Sociotechnical Imaginaries Through A Relational Co-Productionist Lens, Henriette Erawan Kamphorst

Chulalongkorn University Theses and Dissertations (Chula ETD)

Since the introduction of the Green Revolution, the use of agrochemicals in Thai farming has sparked repeated contentious debates among local policy elites, addressing issues such as consumer health, farmer livelihoods, and environmental degradation. In 2019, this subject re-emerged on the policy agenda with the proposed ban of three key agrochemicals: Chlorpyrifos, Paraquat, and Glyphosate. In order to understand why the pesticide issue has remained on policy actors’ agendas for so long and still continues to be subject to ongoing debate, this research takes on a new perspective by adopting a relational co-productionist approach in the construction of contesting sociotechnical …

Private Motorcycle Users' Insights Toward Public Bus Adoption In Phnom Penh, Eangthay Tang

Chulalongkorn University Theses and Dissertations (Chula ETD)

As Phnom Penh experiences rapid population growth and economic expansion, traffic congestion has worsened, largely due to the increasing ownership of private motorcycles. Despite the introduction of public bus services, adoption remains low as concerns over service quality, limited coverage, and inadequate infrastructure deter motorcycle users from making the shift. This study investigates the behavioral intentions, preferences, and concerns of motorcycle users, specifically targeting university students, to understand how public bus services can be improved to encourage adoption. Data were collected in July 2024 from 457 university students who regularly use motorcycles, using a structured questionnaire across four Phnom Penh …

The Effects Of Uv-Radiation On The Removal Of Microplastics In Water Using Agglomeration-Micro-Flotation, Palot Srichonphaisarn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Microplastics, plastic particles with diameter 1 micrometer to 5 millimeters, can disturb marine ecosystems due to their small size and surface properties which can be a carrier for hazardous matters. While wastewater treatment plants could remove some microplastics but some of them remain. Among the various removal techniques, flotation is a potential method due to the hydrophobic nature of microplastics. This study investigates the effects of ultraviolet radiation on the surface wettability of microplastics and removal efficiency of microplastics. The 6 types of microplastics were prepared from plastic boards. After the ultraviolet radiation, the results showed that ultraviolet radiation could …

Exploring Microplastics In Seawater And Zooplankton On The Eastern Coast Of Thailand: A Case Study In Phuket Province, Pensiri Akkajit, Sirima Yuankerd, Arsanchai Sukkuea

Applied Environmental Research

Microplastics can accumulate in the environment and be transferred to different trophic levels, making them a concern for the aquatic food chain. As far as the researcher is aware, this study is the first to analyze microplastics in seawater and zooplankton along the eastern coastline of Phuket, Thailand, emphasizing their ecological significance. Analysis of the seawater samples identified 256 microplastic particles, with an average concentration of 52.6±21.4 and 32.6±30.3 particles L-1 for 20–300 µm and >300 µm classes, respectively. Four zooplankton species—copepod, fish larvae, bivalvia larvae, and shrimp larvae—were chosen for examination. The findings indicated that microplastics can move to …