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 …

Keeping Tradition Alive: Studying The Evolution Of Sweetgrass Basket Stands On Highway 17 In The Charleston Lowcountry, Megan Adornetto

All Theses

Sweetgrass baskets are a popular souvenir for tourists visiting the Lowcountry and for collectors who admire the folk art of the Gullah Geechee people. The stands at which these baskets are sold can be found along Highway 17 in Mount Pleasant, SC. This area was once a rural community that has been developed due to suburban sprawl since the early 20th century. Due to this development, as well as the lack of availability of sweetgrass and other natural resources to create these baskets, the landscape of roadside business at these basket stands is different than it was when the first …

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 …

Online Political Participation Among Younger Generations: A Case Study Of The Nigerian Presidential Election, Bowale Odukale

All Theses

The 2023 presidential elections in Nigeria represented a significant milestone in the nation's democratic progression, capturing the interest of observers both within the country and abroad. This study identifies the key online opinion leaders who participated in the electoral discourse, their generational affiliation, and the role of social media in facilitating youth engagement throughout the political process. Using Sprinkl, an online monitoring tool to harvest publicly available tweets containing the hashtag #NigeriaDecides2023 from February 11 to March 15, coupled with interviews, the study identified the prominent opinion leaders with significant influence, their types of messages and the motives behind youth …

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 …

The Calling Of Governess, Karissa Maust

All Theses

The governess is a widely discussed figure in literary criticism. However, the motivations that cause literary characters to engage in the profession of governess are not often talked about. This thesis discusses the three primary motivations that inspired women to become governesses—survival, duty, and calling. It begins with a historical discussion of the governess, then illustrates women’s reasons for engaging in this occupation, using literary figures from Emma, Villette, and Jane Eyre to do so. The thesis then ends with a discussion of the modern American teacher—how she differs from the governess but also shares the lack of …

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, …

Layered Structure Protonic Ceramic Conductors Of The Form Ba5in2+Xal2zr1-Xo13-Δ, Nathan Cretegny

All Theses

In this work, the hexagonal perovskite of targeted composition Ba₅In_2+xAl₂Zr_1-xO₁₃ (x=0, 0.1, 0.2) was synthesized via a solid-state synthesis route to study the impact of oxygen vacancy concentration in layered hexagonal perovskites. Precursor oxides were mixed in stoichiometric proportions, calcined between 800-1200℃ and sintered at 1475℃. The sintered pellets were crushed into fine powders to investigate the chemistry and structure through X-ray diffraction, neutron diffraction, inductively coupled plasma mass spectrometry, and nuclear magnetic resonance. Dense pellets were used to study conductivity properties using electrochemical impedance spectroscopy.

The synthesis approach produced 100% …

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.

Ethnographic Interviews Of Five Community Leaders Preserving African American Heritage In The Lowcountry, Paige Regna

All Theses

As more African American communities pursue preservation initiatives in their communities, it is becoming increasingly important to examine why the leaders of these communities preserve their heritage, what projects they undertake, and how they accomplish their preservation initiatives. This thesis aims to answer to answer the question: How do five current leaders of preservation in African American communities in Charleston compare in terms of their preservation sites, motivations, goals, and strategies to each other and early preservationists in Charleston? The author used an interview methodology for this thesis and asked fourteen core questions to five preservationists in African American communities. …

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 …

The Effect Of Chlorine Dioxide On Sliced Tomatoes Used In Retail And Foodservice, Charles Mattocks

All Theses

As food prices continue to rise, many consumers are looking at ways to cut back on spending and many look to how much they spend on food. Food waste in an average American household of four leads to about $1,500 worth of unused/wasted food annually,

This study was conducted to see how the use of Chlorine Dioxide (ClO₂) could be used to treat and extend the shelf life of freshly sliced tomatoes for food service applications. Prior research in this regard has looked at whole tomatoes as opposed to sliced varieties, and many have not utilized a sensory …

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 …

Divisor Graph And Factorization Type, Masoumeh Soleimani

All Theses

In this project, we examine some natural ideal conditions and show how graphs can be defined that give a visualization of these conditions. We examine the interplay between the multiplicative ideal theory and the graph-theoretic structure of the associated graph. In this research, we associate a graph in a natural way with the divisors of a commutative ring. ii

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 …

Children Of The Grave: The Rise, Fall, And Experience Of Heavy Metal Music During The Latter Cold War From 1969-1991, Shelby Sibert

All Theses

The Cold War era saw the emergence of many different pop culture phenomena. Some were political, such as the Punk Rock and Hippie movements. Others were fashionable trends like Disco. However, Heavy Metal music is unique due to its opaque origins, skyrocketing popularity, and final disappearance after the end of the Cold War. Heavy Metal had a direct relationship with reflecting the fears and anxieties of the late Cold War period. It was a direct response to the Hippie activist counterculture rock n' roll of the 1960s, and it charters a new path of rock n' roll in the process. …

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 …

Improved Ballistic Impact Resistance Of Nanofibrillar Cellulose Films With Discontinuous Fibrous Bouligand Architecture, Colby Caviness

All Theses

Natural protective materials offer unparalleled solutions for impact-resistant material designs that are simultaneously lightweight, strong, and tough. Particularly, the dactyl club of mantis shrimp features chitin nanofibrils organized in a Bouligand structure, which has been shown to effectively dissipate high-impact energy during powerful strikes. The mollusk shells also achieve excellent mechanical strength, toughness, and impact resistance with a staggered, layer-by-layer structure. Previous studies have shown that hybrid designs, by combining different bioinspired microstructures, can lead to enhanced mechanical strength and energy dissipation capabilities. Nevertheless, it remains unknown whether combining Bouligand and staggered structures in nanofibrillar cellulose (NFC) films, forming a …

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 …

Modern Muses - An Exploration Of A Mind That Refuses To Cooperate, Carrie H. Bull

All Theses

Ancient scholars and artists turned to the classic muses for form, worship, and inspiration in pursuit of crafting their greatest works. In an information age rife with new ideas and new artists, it is inevitable that new creative obstacles will be encountered and new muses will be called upon to overcome them. This project is an exploration of the digital modeling pipeline through the formation of such muses. It begins with the creation and iteration of concept art for three original characters, moves on to the sculpting of the characters in Zbrush, creation of clothes in Marvelous Designer, posing, and …

Identity War: World War I Through The Lens Of Carl Schmitt And Ideology, Charles Zambito

All Theses

This thesis will examine World War I from an ideological perspective through the lens of Carl Schmitt. The Central Powers and in particular how Germany represented Romanticism,Social Darwinism,militarism,and tradition more broadly; at the same time however Germany also paradoxically represented modernism and nationalism sometimes called Reactionary Modernism as all of these ideas were the key to German unification in 1871. The Entente powers and especially France and Britain represented liberalism,empiricism,rationalism, stoicism, and internationalism. The philosophical ideas of stoicism and classicism can especially be seen in Britain where the idea of a stiff upper lip and maintaining peace and order were …

My Risk Or Theirs? An Experimental Investigation Of Character-Driven And Plot-Driven Engagement As Explanations For Risk Perceptions, Emma Cox

All Theses

Two distinct bodies of research examine means of increasing people’s health- related risk perceptions through persuasive message design. First, Construal Level Theory (CLT) posits that reducing perceived psychological distance from a health risk can increase people’s perceived relevance of the health issue. Second, models of narrative persuasion posit that narratives elicit audience engagement, which reduces counter- arguing and increases risk perceptions. So and Nabi’s (2013) Risk Convergence Model (RCM) was proposed to merge the two bodies of research: the model posits that viewers’ engagement with narratives diminishes perceived social distance from characters, resulting in a convergence of risk between characters …

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 …