Digital Commons Network^™

The Design, Development, And Evaluation Of A Usable And Privacy-Enhanced Telepresence Interface For Older Adults, Xian Wu

Theses and Dissertations

Maintaining health and wellness while aging-in-place independently is crucial for older adults. Telepresence technology can be potentially beneficial for this target population to stay socially connected. However, this technology is not specifically designed for older adults. For this target population to adopt such technology successfully, it is important to ensure that they do not experience usability barriers. This research uses HCI/HRI concepts and technology design principles for older adults to design, develop and test telepresence user interfaces (UI). This addresses the following research questions: 1): What are the essential usability and privacy-enhanced features needed to inform the design and development …

Re-Evaluation Of The Extent And Tectonic History Of The Helena Banks Fault Zone, Offshore South Carolina, Ahmet Postaagasi

Theses and Dissertations

The Helena Banks Fault Zone (HBFZ), first identified in the early 1980’s offshore Charleston, S.C., was originally interpreted to be a major, high-angle, basin-bounding normal fault associated with Mesozoic rifting. Subsequent work suggests that (1) Mesozoic rift basins are not present on the continental shelf of South Carolina, (2) the HBFZ originated as a strike-slip fault within Paleozoic sedimentary rocks of the Suwannee Basin sequence, (3) a mafic intrusion inferred from aeromagnetic data is coincident with a broadly circular zone of highly-complex faulting along the north-eastward continuation of the HBFZ where (4) up to 300 m of local relief can …

Salt Tectonism In The Carolina Trough, Ceren Postaagasi

Theses and Dissertations

The Carolina Trough is a major linear sedimentary basin along the eastern continental margin of North America which formed as a result of tectonic and thermal subsidence during continental rifting in Mesozoic time (Hutchinson et al., 1982). The Carolina Trough is unique along the southeastern U.S. margin where the only known evaporite deposits are found, and this salt basin may reserve large amounts of oil and gas (Carpenter & Amato, 1992). Therefore, analysis of 2D multichannel seismic reflection surveys that were conducted in the Mid-South Atlantic Ocean in 1982 plays an important role in Petroleum industry. In addition, current interpretations …

South Carolina Preschool Teachers’ Perceptions And Experiences Implementing Critical Literacy In The Preschool Classroom, Rebecca Weissman

Theses and Dissertations

Critical literacy situated within a critical theoretical and pedagogical paradigm focuses specifically on exploring the sociopolitical implications of texts and challenging information rather than taking it at face value. The present study constitutes a case study that describes the perceptions and experiences of seven preschool teachers who employ critical literacy in their early childhood classroom and how their pedagogy fits within the existing themes seen in the early childhood literature. Specifically, this case study is an instrumental collective study, consisting of in-depth interviews. Through qualitative analysis of these interviews a variety of specific pedagogical methods for implementing critical literacy are …

An Action Research Study Of Female Calculus Students’ Perceptions Of The Flipped Classroom Model, Tammy Parham

Theses and Dissertations

To improve teaching practices away from teacher-centered strategies and towardstudentcenteredmethodology based in constructivist and social constructivist theory, the present research study describes six female students’ perceptions of a flipped-model classroom design in an advanced calculus course. In a flipped-model classroom, there is an inversion of the traditional instructional paradigm to move new content instruction outside of the classroom in order to provide time for student engagement in learning activities and interaction with peers during class meeting time. The flipped model enabled the female students to have more time for collaborative practices and application of calculus material, increased the student-participants’ interactions …

Counseling Program Intervention For Improving African American Students’ Science, Technology, Engineering, And Mathematics Dual Enrollment Participation, Sonja L. Taylor

Theses and Dissertations

African Americans are underrepresented at all points in the STEM pipeline from K-12 coursework into professional careers. The reasons for this underrepresentation are varied and reflect a myriad of contributing factors based on early academic experiences, sociocultural influences, and the effects of standardized testing. The three-fold purpose of this study was to implement a counseling program to inform nine African American study participants about the dual enrollment opportunity at their high school, to gain perspective about the factors which shaped their STEM disposition, and to determine the effect of the program on their attitudes about dual enrollment participation. The study …

Study Of 4h-Sic And Alxga1-Xn Based Heterojunction Devices For Ultraviolet Detection Applications, Venkata Surya Naga Raju Chava

Theses and Dissertations

Ultraviolet (UV) detectors are important for their applications in flame detection, furnace gas control systems, plume monitoring etc. Due to their wide band-gap, 4H-SiC (Eg=3.26eV) and III-V semiconductors such as GaN (Eg=3.4eV), AlxGa1-xN (Eg=3.4eV to 6.2eV) etc., are excellent candidates for visible(��cut-0ff=400nm) and solar blind(��cut-0ff=290nm) UV detectors. Conventional SiC UV detectors suffer from poor UV responsivities due to reflection/absorption/transmission losses caused by the metal electrodes used in those detectors.

In the first part, a novel bipolar transistor with epitaxial graphene(EG)/p-SiC (30μm)/n+-SiC substrate was fabricated and characterized. The 2-3 ML thick, transparent and conducting, EG used in this work was grown …

“Be Of Knightly Countenance”: Masculine Violence And Managing Affect In Late Medieval Alliterative Poetry And Batman: Under The Red Hood, Lisa D. Camp

Theses and Dissertations

This thesis is concerned with the legacy of cultural representations of masculine violence as it manifests in late medieval alliterative poetry and contemporary superhero comics, and the ways in which those manifestations are inflected by a particular set of images, motifs, and cultural underpinnings which transcend sociohistorical boundaries and that illuminate the ways culture sanctions certain forms of masculine violence. To understand how, as Patricia Ingham suggests in Sovereign Fantasies: Arthurian Romance and the Making of Britain, imagination infuses history towards particular “regime[s] of truth,” I argue that late fourteenth century Arthurian alliterative poetry and contemporary superhero comics instruct a …

Role Of Bed Design Characteristics On The Effective Thermal Conductivity Of A Structured Adsorbent, Pravin Bosco Charles Antony Amalraj

Theses and Dissertations

This work evaluates the role of different design variables on the effective thermal conduction of a structured adsorbent bed for its possible application in a temperature swing adsorption (TSA) process. The structured adsorbent bed is represented by eight parallel layers of intercalated smooth and corrugated foils of a metal support coated with 13X zeolite resulting in the formation of parallel triangular channels. The variables investigated include the thickness of the adsorbent coating, thickness of the metal, nature of contacts between smooth and corrugated foils, type of metal, presence and magnitude of an air gap between the foils, difference in alignment …

Internal Gravity Wave Detection During The 21 August 2017 Total Solar Eclipse, Michael J.W. Stewart

Theses and Dissertations

Total solar eclipses supply both visual captivation and a controlled meteorological experiment through a sudden decrease in solar radiation. However, along with commonly expected changes in weather conditions, prior research suggests an adjustment of atmospheric dynamics caused by both a decrease in local incident solar radiation and the Moon’s sweeping shadow across the Earth at supersonic speed. The result is the potential production of internal gravity waves, which transfer both energy and momentum vertically to and from the upper levels of the atmosphere. A series of radiosondes were launched before, during, and after the 21 August 2017 eclipse in Batesburg, …

Combinatorial Study Of Oxidation Catalysts: Uncovering Synthesis-Structure-Activity Relationships, Kathleen B. Mingle

Theses and Dissertations

High throughput experimentation (HTE) in catalysis has proven useful in expediting materials discovery via parallelized synthesis, characterization, and testing of candidate materials. However, even in a high-throughput manner, the combinatorial explosion of relevant parameters far exceeds our ability to study. To further complicate the problem, a large time investment and great deal of characterization is often required to build an in-depth understanding of catalytic materials. It follows that the field of heterogeneous catalysis is rich with examples of catalytic systems that have been developed using trial and error efforts for which a lot is known but context is lacking. Techniques …

Hydrothermal Carbonization Of Food Waste For Nutrient Recovery And Reuse, Ifeolu M. Idowu

Theses and Dissertations

Food waste represents a rather large and currently underutilized source of potentially available and reusable nutrients. Laboratory-scale experiments evaluating the hydrothermal carbonization of food wastes collected from restaurants were conducted to understand how changes in feedstock composition and carbonization process conditions influence primary and secondary nutrient fate. Results from this work indicate that at all evaluated reaction times and temperatures, the majority of nitrogen, calcium, and magnesium remain integrated within the solid-phase, while the majority of potassium and sodium reside in the liquid-phase. The fate of phosphorus is dependent on reaction times and temperatures, with solid-phase integration increasing with higher …

Nondestructive Evaluation Of Corrosion Damage In Reinforced Concrete Aged Slab Specimen, Rawya Abdulsattar Abduljabbar

Theses and Dissertations

The deterioration of concrete bridge decks presents a maintenance challenge for most transportation agencies and bridge owners. This problem increases during the freeze-thaw cycle. De-icing salts can accelerate the deterioration process. Corrosion of steel reinforcement in reinforced concrete structures is considered a dominant factor causing premature deterioration, especially those structures located in a coastal environment. The resulting corrosion product produced has several times the volume of steel, resulting in cracking of the concrete cover if the corrosion is significant. In this study, a bridge deck specimen was subjected to an artificial environment to accelerate the corrosion process. Prior to this …

Stabilization Of Silicon And Germanium Based High Capacity Anodes For Lithium Ion Batteries, Kuber Mishra

Theses and Dissertations

Lithium-ion batteries (LIBs) have been the driver of the widespread application of portable electronics. As the electronic devices have been more powerful and versatile, the pressing demand for higher energy density batteries have led the extensive explorations of novel materials for high capacity electrodes. Despite several breakthroughs in literature, the current state of art LIBs still uses the battery chemistry developed in early 1990s.The keys challenges for switching to other high capacity electrodes have been high cost, non-linear scalability and poorer electrochemical performance. This dissertation focusses on development of high capacity electrodes in order to increase the energy density of …

Impact Of Critical Path Method (Cpm) Of Scheduling On On-Time Completion Of Transportation Projects, Fahim Ahmed

Theses and Dissertations

This study addresses the effectiveness of Critical Path Method (CPM) scheduling on project delivery. Specifically, the on-time completion of projects with and without a CPM schedule is explored. The paper uses data from 2,097 South Carolina transportation projects let after February 2008 and substantially completed by August 2015. The delay analysis uses the original contract completion date as well as the completion date adjusted by change orders. Chi-Squared tests are used to examine the relationship between CPM scheduled projects and delayed projects, and t-tests are used to compare the mean delay (in days) between CPM scheduled and unscheduled projects. The …

Fundamental Aspects Of A Novel Technology For Abatement Of Indoor Allergens, Odell Lendor Glenn Jr.

Theses and Dissertations

The overall goal of this research was to develop a novel approach to reduce the potency of certain asthma triggers, namely, proteins produced by pests or pets in indoor environments. The broad hypothesis of the research was that naturally occurring essential oils will demonstrate enhanced denaturing ability. In any indoor environment, allergens are bound to dry dust particles. In this work, the effectiveness of using dry ice and CO2 with potential for essential oils on dry allergenic proteins through CFD modeling and ELISA methods were evaluated.

There are three objectives central to this work. The first objective was to apply …

Ontology-Guided Pre-Release Inference Disruption, Mark Stephen Daniels

Theses and Dissertations

We investigate privacy violations occurring when non-confidential patient data is combined with medical domain ontologies to disclose a patient’s protected health information (PHI). We propose a framework that detects privacy violations and eliminates undesired inferences. Our inference channel removal process is based on controlling the release of the data items that lead to undesired inferences. These data items are either blocked from release or generalized to eliminate the disclosure of the PHI. We show that our method is sound and complete. Soundness means the only inference paths generated logically follow from released data and corresponding domain knowledge. Completeness means we …

Novel Wideband Ebg Structures For Isolation Improvement Between Cosite Antennas, Paul John Czeresko Iii

Theses and Dissertations

As the number of installed antennas increases on a structure, the available real estate to do so without each antenna interfering with the others diminishes. Electromagnetic band gap (EBG) structures are one way to mitigate this cosite interference with compact antenna installations. While a host of EBG structures and types (3-D, planar etc.) have been proposed and studied historically, it has been found that planar EBG structures tend to provide very narrow bandwidths for both antenna design and cosite interference reduction. This research focuses on the design of EBG structures intended to achieve greater than 20 dB of isolation improvement …

Electrochemical Methods To Study Real-Time In Vivo Neurochemistry, Aya Abdalla

Theses and Dissertations

Serotonin neurotransmission has multiple facets that are challenging to characterize, due to the lack of analytical tools that can measure serotonin in the brain. In addition, the mechanisms of serotonin modulation by other neurotransmitters, such as histamine, are not well understood. These limitations make the study and treatment of disorders in which serotonin is implicated problematic. This dissertation presents novel electrochemical methods, in addition to the well-established serotonin fast-scan cyclic voltammetry (FSCV), to better understand the dynamics of serotonin and histamine neurotransmission in vivo. In Chapter 1, a method, known as fast-scan controlled adsorption voltammetry, was optimized to selectively and …

Structurally Integrated Reconfigurable Wideband Array For Conformal Applications, Michael Damon Wright

Theses and Dissertations

Structurally integrated conformal antennas offer significant advantages over traditional bolt on antennas, especially for air vehicle applications. The ability to leverage the entire structure allows for unconventionally large antennas and arrays to be implemented in a manner which does not detract from the aerodynamic, structural or aesthetic qualities of the vehicle. Works along this line have included Slotted Waveguide Antenna Stiffened Structures (SWASS), conformal helix and spiral antennas, Log Periodic Dipole Arrays (LPDA), and other antennas.

An area which has not been investigated to date is the possibility of implementing reconfigurable antennas in a structural environment. There are inherent challenges …

Two-Electrode Measurements Of Electrostatic Double Layer Potentials With Atomic Force Microscopy, Jason Giamberardino

Theses and Dissertations

In this dissertation, I provide a thorough description of my development of theoretical, analytical, and experimental techniques pertaining to novel measurements of the electrostatic double layer (EDL) using atomic force microscopy (AFM), among other techniques. The EDL refers to the structure formed by ions that exists at the interface between a solid and a liquid. The EDL is an important physical element of many systems and its behavior has been of interest to scientists for many decades. Because many areas of science and engineering are moving to test, build, and understand systems at smaller and smaller scales, this work focuses …

Authenticating Users With 3d Passwords Captured By Motion Sensors, Jing Tian

Theses and Dissertations

Authentication plays a key role in securing various resources including corporate facilities or electronic assets. As the most used authentication scheme, knowledgebased authentication is easy to use but its security is bounded by how much a user can remember. Biometrics-based authentication requires no memorization but ‘resetting’ a biometric password may not always be possible. Thus, we propose study several behavioral biometrics (i.e., mid-air gestures) for authentication which does not have the same privacy or availability concerns as of physiological biometrics.

In this dissertation, we first propose a user-friendly authentication system Kin- Write that allows users to choose arbitrary, short and …

Monitoring The Progress Of Damage In A Sicf-Sicm Composite Nuclear Fuel Cladding Under Internal Pressure Using Acoustic Emission, Luis H. Alva

Theses and Dissertations

The relation between the progress of damage and the acoustic emission (AE) activity of a nuclear grade Sif-SiCm composite tubing under internal pressure was studied. The nuclear grade Sif-SiCm composite tubing is manufactured by the company General Atomics (GA) and made of nuclear grade HI Nicalon type S fiber preforms following a chemical vapor infiltration (CVI) technique. Sif-SiCm composites are good candidates to replace current nuclear fuel cladding materials because of the good chemical stability and strength at high temperatures. In this work, a Sif-SiCm composite tubing was tested under internal pressure at room temperature (RT) to study the damage …

Evaluation Of Sonocatalytic Degradation Of Ibuprofen And Sulfamethoxazole In The Presence Of Various Catalysts, Yasir Alhamadani

Theses and Dissertations

Over the last two decades, large quantities of products, such as medicines, disinfectants, and personal care products, have been released into surface waters and wastewater treatment facilities by the pharmaceutical and chemical industries which have come to the attention of scientists with regard to their impacts on life in lakes, rivers, and groundwater. Among various types of treatment processes, ultrasonic (US) treatment process was used in this study to investigate the effect catalysts and removal of selected pharmaceutical’s (PhACs) compounds (ibuprofen (IBP) and sulfamethoxazole (SMX)). Carbon nanomaterials (CNMs) have become candidates for numerous applications in nanocomposites, microelectric devices, sensors, energy …

Multifunction Radio Frequency Composite Structures, David L. Zeppettella

Theses and Dissertations

There has been recent interest in the development of multifunction structures for weight-critical applications. A multifunction structure is a load-bearing structure that also allows one or more additional functions such as RF communication, energy storage, sensing etc. The focus of this dissertation is to analyze, design, develop, and test new high performance (broadband, high gain, circularly polarized) internal antennas that are structural and integral to the aircraft. It is demonstrated that antennas with more bandwidth and higher efficiency could be developed if the space and materials available in an aircraft structure could be judiciously exploited for multifunctional usage. This is …

Modulation Of Amyloid-Β Aggregation Via Small Molecules And Glycine Zipper Alterations, Steven Zebulon Vance

Theses and Dissertations

Alzheimer’s disease (AD) is the most common form of neurodegenerative disease. Nationally, AD is the 6th leading cause of death and the only top 10 killer of Americans that cannot be slowed, cured, or prevented. AD is characterized by the deposition of extracellular plaques of aggregated amyloid-β protein (Aβ). Aβ originates from the amyloid precursor protein (APP), a transmembrane protein that is cleaved to form a short and inert protein fragment called Aβ. However, Aβ undergoes a nucleation process wherein aggregates from soluble oligomers to insoluble fibrils are formed. While uncertainty remains as to the exact mechanism, studies have associated …

Structural Transformations Of Multimetallic Nanoparticles, Guangfang Li

Theses and Dissertations

Atomic-level understanding of the structural transformations of multimetallic nanoparticles (NPs) triggered by external stimuli is of vital importance to the enhancement of our capabilities to precisely fine-tailor the key structural parameters and thereby to fine-tune the catalytic properties of the NPs. In this work, I firstly show that Au-Cu bimetallic NPs demonstrate stoichiometry-dependent architectural evolutions during chemical dealloying processes and nanoporosity-evolving percolation dealloying only occurs for Au-Cu alloy NPs with Cu atomic fractions above the parting limit. The electrochemically active surface area and the specific activity of the dealloyed nanoframes can be systematically tuned to achieve the optimal electrocatalytic activity. …

The Effect Of A Compassion Fatigue Awareness And Self-Care Skills Educational Program On Retention Among Certified Nursing Assistants Working In A Veterans Nursing Home, Michele M. Dreher

Theses and Dissertations

Background: Compassion fatigue is defined as the emotional and physical exhaustion that can affect helping professionals and caregivers over time. Certified nursing assistants (CNAs) are at high-risk for compassion fatigue due to their daily exposure to those who are suffering from a myriad of chronic medical and behavioral illnesses along with repeated workplace stressors. If not addressed early, compassion fatigue can adversely impact a CNA’s wellbeing and quality of resident care. Compassion fatigue is associated with high absenteeism, high turnover, and low retention rates. Despite these challenges, there is no published research on the effects of a workplace compassion …

Development Of Models And Solution Methods For Different Drayage Applications, Samaneh Shiri

Theses and Dissertations

In the last decades, intermodal freight transport is becoming more attractive in the global supply chains and freight transport policy makings. Intermodal freight transport provides a cost-effective, reliable, and efficient movement of freight by utilizing the strengths of different transport modes. The initial and final segment of intermodal freight transport, performed by truck, is known as “drayage.” The scheduling of truck movements in drayage operation within the service area of an intermodal terminal is an operational problem which leads to a truck scheduling problem that determines the efficient schedule of trucks while satisfying all transportation demands and constraints. Drayage accounts …

An Experimental And Numerical Investigation Of Machining Chips Behavior In Compaction And Consolidation Processes, Naseer M. Abbas

Theses and Dissertations

Manufacturing processes such as machining and cutting often produce metal wastes (e.g. machining chips) that can be costly to recycle using conventional methods that involve melting. The Friction Extrusion Process (FEP) and Friction Consolidation Process (FCP) provide a novel method of recycling machining chips to produce useful products such as wires or consolidated disks without melting. These solid-state processes do not require complicated equipment and offer a cost effective and environment friendly alternative route to metal waste recycling.

The current study was aimed at achieving an understanding of the mechanical and thermal behavior of machining chips during compaction and consolidation …