Digital Commons Network^™

Deep Reinforcement Learning Of Variable Impedance Control For Object-Picking Tasks, Akshit Lunia

All Theses

The increasing deployment of robots in industries with varying tasks has accelerated the development of various control frameworks, enabling robots to replace humans in repetitive, exhaustive, and hazardous jobs. One critical aspect is the robots' interaction with their environment, particularly in unknown object-picking tasks, which involve intricate object weight estimations and calculations when lifting objects. In this study, a unique control framework is proposed to modulate the force exerted by a manipulator for lifting an unknown object, eliminating the need for feedback from a force/torque sensor. The framework utilizes a variable impedance controller to generate the required force, and an …

Digital Twin In Military Ground Vehicles: Design And Predictive Maintenance, Conner W. Eddy

All Theses

Digital twin technology builds upon virtual engineering models, computer simulation, and real-time field data streaming to enable next-generation designs and predictive maintenance. A digital twin is a computer-based high-fidelity collection of models that predicts the performance of dynamic systems per operating cycles, input feature parameters, and data communication from a physical plant. Product Lifecycle Management (PLM) is growing in importance and is central to virtual design processes where the digital twin toolset fits into this emerging architecture. The product design process can be advanced using digital twin resources by eliminating the need for, and cost from, continual physical prototyping, reliability …

The Post Pandemic Learner: How Spatial Dynamics & Accessibility Impact The Learning Experience, Erikka Misrahi

All Theses

The COVID-19 pandemic had unprecedented impacts on Generation Z (Gen Z) in regard to mental wellbeing and learning impacts. While the world shut down in March 2020, the majority of students who have since entered college were forced to attend some portion of high school using remote learning platforms. This transition, while necessary at the time, has had repercussions that are still being felt in higher education. These impacts, combined with the challenges that Gen Z were already experiencing due to the pressures of social media, and the impacts that technology has had on attention spans, have changed their learning …

Analytical And Experimental Studies To Support Codification Of Lightweight Grout For Masonry Design, Cooper Banks

All Theses

Lightweight (LW) aggregates have many potential benefits in masonry construction including minimizing mass, improving thermal performance, and reducing the potential for shrinkage cracking via internal curing. The current masonry design standard, TMS 402/602-22, permits lightweight aggregate in the production of concrete masonry units (CMU), but there has been insufficient testing of masonry assemblies to permit designing with LW grout. Shrestha et al. characterized LW grouts bond to reinforcement, shear strength, tension and shear pullout behavior of anchors and proposed possible reduction factors for design. Hiner characterized the flexural bond strength LW grouted masonry assemblies and proposed possible reduction factors for …

Division-I Student-Athletes’ Socialization Out Of Sports: The Role Of Exit Circumstances And Interpersonal Support On Wellness, Hannah J. Gertz

All Theses

Student-athletes who compete at the Division-I level typically receive much public exposure and attention during their athletic careers, often leading them to form a high athletic identity. As such, they often need help transitioning away from the athletic competitor role following their retirement. This process, known as socialization out of sport (SOS), is characterized by a loss of purpose and identity for student-athletes and can harm their overall well-being and quality of life. Establishing the empirical associations between SOS's proposed characteristics/features (e.g., the impetus of SOS, educational status, athletic identity, and sense of closure) and former student-athletes’ subsequent life experiences …

Tracking The "Soiled Doves": A Cultural Landscape Of Sex Work In Charleston, South Carolina From 1880-1939, Rachel Fore

All Theses

Sex work in the United States has become a more widely studied subject in the last twenty years. Most of these studies focus on the historical or archaeological evidence left behind by sex workers. Many of these studies focus most heavily on sex work in the western United States. Studies have looked through a variety of different lenses including gender, race, and economic impact. Despite these varied lenses, little attention has been paid to sex work in Southern cities such as Charleston, South Carolina. The purpose of this thesis is to add to the basic understanding of the prevalence, placement, …

An Analysis Of The Demolition Of Seismically Damaged Historic Structures After The 1989 Loma Prieta Earthquake, California, Claire Ann Cox

All Theses

The Loma Prieta Earthquake of 1989 was an event that greatly impacted the lives of those living in the greater San Francisco Bay Area. The 6.9M_w earthquake severely damaged buildings and infrastructure, inevitably leading to the demolition of some of these structures. Older buildings constructed before modern seismic codes were most vulnerable to damage. Yet, age is the same reason many of these buildings were considered historic and valuable in their communities. In the wake of Loma Prieta, an alarming trend of the demolition of historic buildings arose.

This thesis analyzes the demolition of historic structures due to damage …

A Post-Quantum Mercurial Signature Scheme, Madison Mabe

All Theses

This paper introduces the first post-quantum mercurial signature scheme. We also discuss how this can be used to construct a credential scheme, as well as some practical applications for the constructions.

Understanding The Traditions And Experiences Of African American Hunters, Ezekiel Adesawe

All Theses

Hunting is a significant cultural, economic, and wildlife management activity in the United States. However, African Americans remain underrepresented among hunters, with limited research to understand their perspectives and experiences. Hence, this study employed an exploratory focus group method design to profile African American hunters' real and perceived experiences, traditions, and needs. The interviews were conducted with 67 African American hunters from all regions across the country. The interview data were analyzed through thematic coding to construct key themes. Key findings from this study revealed that hunting is a strong tradition within African American communities that has been passed down …

Defining And Labeling Traversable Space In A Forested Environment, James Nguyen

All Theses

This thesis investigates the problem of identifying traversable terrain in outdoor conditions. We are motivated by research in recent years toward identifying drivable space for the purpose of developing autonomous vehicles. Our motivating application is similar but also different. We envision a “Hiker Helper” that assists humans with dismounted navigation in forested terrain. A common challenge in this type of environment is identifying a viable path for moving through terrain that is congested with trees, bushes, other flora, and natural obstacles that would make navigation difficult. We envision training an artificial intelligence (AI) model to automatically analyze images of this …

A Transdisicplinary, Survivor-Centered Approach For Creating A System Dynamics Model Of Closed-Buyer Sex Trafficking Networks, Kemonte Yow

All Theses

One of the largest drivers of sex trafficking operations is the demand for commercial sex. To date, research from a quantitative side typically focuses on understanding how to best identify and remove victims from their trafficking situation and then support their healing and recovery. This may be because this is where data exists (in limited forms) to support quantitative modeling. This thesis broadens that scope to understand how demand for commercial sex impacts trafficking operations. In particular, this research implemented a transdisciplinary, survivor-centered approach to build a system dynamics model of a closed-buyer sex trafficking network, which is a network …

Something Old, Something Blue: An Analysis Of Identification Methods For Determining The Presence Of Indigo Within Historic Textiles For The Charleston Museum, Chris Cone

All Theses

Identification methods for the analysis of indigo dye within textiles have been compiled in multiple studies. Though few examples demonstrate chemical analysis and phase separation as a technique that can assist in the identity of the dyestuff. The inclusion of nontechnical methods, techniques that require little knowledge of chemistry and can be completed without the assistance of high-tech machinery, can contribute toward these efforts. The goal of this thesis was to provide a simple testing procedure where eight historic textile samples dating from the mid-eighteenth to the mid-nineteenth centuries were subjected to chemical analysis and phase separation to determine the …

A Building Worth Its Salt: Residual Chloride Exposure From Frequent Inundation In 19th-Century Masonry Construction On The Battery Of Charleston, South Carolina, Sarah Gaston

All Theses

The growing frequency of intense storm events, minor coastal flooding, and salinity levels of the rising groundwater tables in Special Flood Hazard Areas, including those within Charleston, South Carolina, are affecting historic buildings and their masonry materials in a manner that is only beginning to be discussed in the field of Architectural Conservation. By determining the quantity and location of salt deposits within the mortar measured vertically along historic brick walls, this thesis contributes to the understanding of flooding impacts on historic buildings. This thesis analyzes the distribution of chloride vertically up brick or stucco-clad walls of 19th-century masonry buildings …

Redesign Of X-Ray Irradiator To Expand Research Of Low-Dose X-Ray Radiation, Lauren Ulbrich

All Theses

The effects of high-dose radiation are well-documented, and are understood to be harmful to the human body. On the other hand, the effects of low-dose radiation are much less understood. There is debate over whether or not there are negative, positive, or no effects at all from low-dose radiation. One of the reasons why these effects are not well known is because there aren't as many studies done on this type of radiation. It is a lot harder to classify the effects of radiation at low doses due to many external factors. However, the Clemson Medical Physics lab has been …

Mechanical And Thermal Measurement Techniques For Crystalline-Core/Crystalline-Clad Optical Fibers, Evan Watkins

All Theses

Optical fiber laser systems offer advantages such as high optical gain, efficient cooling, and the production of high-quality optical beams. Fiber lasers are characterized by their unique core-cladding structure, providing optical benefits and mechanical properties that impact their performance. Interests in materials such as yttrium aluminum garnets (YAG) and lutetium oxide (Lu2O3 also lutetia) as laser mediums are due to their high average power capabilities, but thermal management remains a challenge. This thesis discusses the choice of ytterbium (Yb3+) as a dopant in YAG and lutetia, exploring its electronic structure and relevance to thermal properties. The thesis focuses on the …

Development Of A Cost-Affordable Thin-Layer Chromatography Testing Kit For Falsified And Substandard Pharmaceuticals In Tanzania, Eleanor Hatcher

All Theses

A significant number of pharmaceuticals supplied to Tanzania are falsified or substandard. A majority of these inadequate pharmaceuticals are medications to treat life-threatening conditions. This problem not only causes mistrust in the healthcare system but also prolonged illness and potentially death for the patients. This calls for the need for the development of a cost-affordable testing kit for falsified and substandard pharmaceuticals in Tanzania. Thin-layer chromatography (TLC) was used as the testing method since it is inexpensive and requires a low skill level to complete. Malaria, human immunodeficiency virus, hypertension, tuberculosis, and diabetes are five of the most prevalent diseases …

The Historical Biogeography Of Spiny Lobsters In The Genus Panulirus And The Influence Of Environmental Conditions On The Adaptive Evolution Of Mitochondrial Protein-Coding Genes In The Achelata, Alyssa Baker

All Theses

Contemporary and historical changes in marine environmental conditions influence biodiversity drastically. In marine invertebrates with highly dispersive planktonic larvae, diversification is facilitated or constrained by tectonic plate movements altering geography, prevailing current patterns, and climate. The decapod crustacean infraorder Achelata, which contains the spiny (fam. Palinuridae) and slipper (fam. Scyllaridae) lobsters, is characterized by a long-lived phyllosoma larvae stage. Panulirus is the most economically significant and speciose genus of spiny lobsters, with 20 recognized extant species and 5 subspecies distributed throughout shallow tropical and subtropical oceans worldwide. Diversification within these lineages has been proposed to be primarily driven by geological …

“Home On The Phone”: How Black Students At A Pwi Use Digital Space To Form Community, Malaysia Barr

All Theses

College is a time when students are traditionally away from home in the hopes of not only securing a better future through higher education but have the ability to shape who they are as individuals. As Predominately White Institutions serve few minority students, this can prove to be challenging for them as they do not fit into the majority racial group. This thesis investigates how Black students at a PWI utilize the mobile app, GroupMe, as a method of connecting and networking within their racial community. Through focus groups and individual interviews, this study found that Black students use digital …

Depression And Anxiety: Investigating The Impacts Of Scheduling On The Mental Health Of Healthcare Workers During The Covid-19 Pandemic, Christofer Gonzaga

All Theses

Depression is a growing problem in the United States and has ballooned into a globally recognized mental health issue that affects shift workers in various fields (Lee et al., 2017). Rates of depression and anxiety have been shown to be substantially increasing and the COVID-19 pandemic amplified this prevalence of depression and anxiety. In the United States, the prevalence of depression symptoms was more than 3- fold higher during COVID-19 compared to before the pandemic (Ettman et al., 2020). The delivery of healthcare services is an ongoing and dynamic process, requiring clinicians to work in various shifts to ensure the …

Ahead Of The Digital Curve: Digitally Documenting And Interpreting The Historic Built Environment In Museums, Hannah St. Onge

All Theses

Digital documentation technology came into the mainstream of preservation in the late 20^th and early 21^st centuries. These technologies have also begun to make their way into museums, another piece of the preservation field. Literature detailing the use of digital documentation technology in museums focuses largely on isolated case studies, often from museums in Europe and Asia. The research on the topic currently lacks a broad understanding of the use of these technologies in museums across the United States.

This thesis utilizes a survey method to determine the scope of digital documentation technologies usage to create 3D digital …

Low-Resource Icd Coding Of Discharge Summaries, Ashton Williamson

All Theses

Medical coding is the process by which standardized medical codes are assigned to patient health records. This is a complex and challenging task that typically requires an expert human coder to review health records and assign codes from a classification system based on a standard set of rules. Considering the downstream use of these codes in statistical analysis, billing, and patient care, improving the accuracy and efficiency of the medical coding process through automation could have a far-reaching impact on the healthcare domain. Since health records typically consist of a large proportion of free-text documents, this problem has traditionally been …

The Catalyst For Preservation: Assessing The Impact Of Historic Tax Credit Leverage On Surrounding Property Values In The State Of South Carolina, John Sutton

All Theses

The historic rehabilitation tax credit, in its many forms, is the single greatest driver of historic preservation investment in the United States. Despite this, very little research has been done regarding the secondary effects of historic tax credit leverage. The goal of this thesis is to assess the impact that substantial historic tax credit projects have had on the value of the properties that surround them in the state of South Carolina. Property tax assessment records were solicited from three different county governments within South Carolina to analyze the change in the assessed value induced by the introduction of tax …

In Search Of A Blind Tiger: A Cultural And Historic Landscape Analysis Of Prohibition-Era Charleston, Chloe Martin

All Theses

Though Charleston, South Carolina is known as a historic city, many of its historic landscapes lack representation within modern compiled histories. One such landscape is that of Dispensary and Prohibition-era Charleston, which can be defined as the period between 1893, with the ratification of The Dispensary Act, and the repeal of the National Prohibition in 1933. This thesis research documents and assesses the cultural and historic landscape of the Charleston peninsula during the Dispensary and Prohibition eras. This study intends to create a baseline with which this period in Charleston can be studied, both culturally and architecturally.

The primary data …

Illusions Of Freedom? A History Of Attitudes Toward Death, Dominick Bucca

All Theses

My thesis explores the historical question: “Is there any freedom from death?” through three figures within the Western metaphysical tradition: Thucydides (460-400 BCE), Augustine (354-430 CE), and Miguel de Cervantes Saavedra (1547-1616). In so doing, my thesis suggests the following: for Thucydides, freedom from death arose through the immortality of empire; for Augustine, through the immortality of God’s grace; and for Cervantes, through the immortality of narratives/attitudes of immortality. Moreover, I nest my claim within an exploratory narrative. Which is to say that, lifting a page from Martin Heidegger (1889-1976), I have attempted to break away from the near total …

Multi-Domain Secure Dds Networks For Aerial And Ground Vehicle Communications, Daniel Pendleton

All Theses

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Light-Induced Phase Separation Purification For Monoclonal Antibodies, Xuyang Chen

All Theses

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Heterogeneous Federated Learning At Scale, Dmitry Lukyanov

All Theses

Federated learning has emerged as a solution to the challenges faced by traditional centralized machine learning approaches, such as data privacy, security, ownership, and computational bottlenecks. However, federated learning itself introduced new challenges, including system heterogeneity and scalability. Existing federated learning approaches, such as hierarchical and heterogeneous federated learning, address some of these challenges but have limitations in real-world scenarios where multiple issues coexist, particularly in large-scale, heterogeneous environments like mobile applications and IoT devices. This work proposes a new federated learning architecture that combines heterogeneous federated learning and hierarchical federated learning into a unified architecture. The proposed approach aims …

Characterization Of Ato Family Transporters In The Fungal Pathogen Cryptococcus Neoformans, Will Betsill

All Theses

Fungal pathogens are a significant threat to public health as they are becoming increasingly common and more resistant to treatment. Cryptococcus neoformans contributes greatly to this threat annually by causing an estimated 278,000 cases of cryptococcal meningitis resulting in approximately 181,000 deaths globally according to the CDC. C. neoformans is ubiquitous across most of the globe and can be found in such places as in trees or soil. Exposure to this fungus is especially dangerous to individuals who are immunocompromised or immunosuppressed. In these cases, inhalation of spores can lead to infection in the lungs. Once in the lungs, C. …

The Impact Of The Graphic Communications Outreach And Recruitment Program On The Gc Identity, Riley Dekrafft

All Theses

The present study evaluates the impact of Clemson Graphic Communication's Outreach and Recruitment program on high school students' perceptions of the major and their college and post-college opportunities. Through surveys and events sponsored by Outreach, the research aims to determine the overall influence of the GC program. Participating students, accompanied by their instructor and guardians, will visit Godfrey Hall, Clemson University's Graphic Communications building. Before the trip, students must complete a comprehensive survey gauging their understanding of the Graphic Communications program and its industry. During the visit, students will engage in rotational activities to experience the daily practices of Graphic …

Broadening The Application Range Of Cell-Free Protein Expression Systems, Matthew Becker

All Theses

Centralized protein manufacturing platforms make the delivery of needed therapies to places with limited infrastructure almost impossible. Cell-free protein expression systems, systems that utilize protein production machinery extracted from cells, offer these communities a viable protein expression platform that is robust and easily deliverable to the place of need. Much work in cell-free system engineering looks to increase the hardiness of cell-free system (CFS) components, like the extract and reaction buffer, needed to carry transcription and translation of gene therapeutic targets forward. Freeze- and air-drying of extract, reaction buffer, or both with certain additives, like sugar molecules, has been proposed …