Designer Metasurfaces For On Demand Optical Responses, Matthew S. Lepain

Electronic Theses and Dissertations

Nanostructured materials are one of the leading areas in photonics currently. These structures offer almost limitless possibilities in the manipulation of light. Using two different semi-analytical simulation methods, I show a few of the possible properties that these nanostructures possess, including polarization rotation and coupling with electronics.

Examining The Effects Of Enclosure Size At Training And At Test In Spatial Reorientation, Zebulon K. Bell

Electronic Theses and Dissertations

Previous research has begun to shed light on the differentiated influence of enclosure size on cue use during reorientation (Sturz, Forloines, & Bodily, 2012). Namely, the question remains of why both feature (i.e., objects or landmarks in the enclosure) and geometric (i.e., shape of the enclosure) cues are differentially affected by enclosure size, and the extent to which local (i.e., wall lengths and corner angles) and global (i.e., principal axis of space) geometric cues are affected by enclosure size. Further, it remains unclear whether training size, testing size, or the relationship between training and testing size influences the use of …

Quasi-Random Action Selection In Markov Decision Processes, Samuel D. Walker

Electronic Theses and Dissertations

In Markov decision processes an operator exploits known data regarding the environment it inhabits. The information exploited is learned from random exploration of the state-action space. This paper proposes to optimize exploration through the implementation of quasi-random sequences in both discrete and continuous state-action spaces. For the discrete case a permutation is applied to the indices of the action space to avoid repetitive behavior. In the continuous case sequences of low discrepancy, such as Halton sequences, are utilized to disperse the actions more uniformly.

Modeling Volatility Of Financial Time Series Using Arc Length, Benjamin H. Hoerlein

Electronic Theses and Dissertations

This thesis explores how arc length can be modeled and used to measure the risk involved with a financial time series. Having arc length as a measure of volatility can help an investor in sorting which stocks are safer/riskier to invest in. A Gamma autoregressive model of order one(GAR(1)) is proposed to model arc length series. Kernel regression based bias correction is studied when model parameters are estimated using method of moment procedure. As an application, a model-based clustering involving thirty different stocks is presented using k-means++ and hierarchical clustering techniques.

Quantification And Characterization Of Net Precipitation Bacterial Flux From A Subtropical Epiphyte-Laden Oak Forest, Preston Pound

Electronic Theses and Dissertations

Transport pathways of microbes between ecosystem spheres (atmosphere, phyllosphere, and pedosphere) represent major fluxes in nutrient cycles and have the potential to significantly affect microbially-mediated biogeochemical processes. We quantified a previously unexamined microbial flux from the phyllosphere to the pedosphere during rainfall via throughfall (rainfall dripping from the canopy and through gaps) and stemflow (rainwater funneled down the stem). Bacterial concentrations were quantified using flow cytometry and validated with quantitative Polymerase Chain Reaction (qPCR) assays for samples from a Quercus virginiana (oak)- forest with heavy epiphyte cover (Tillandsia usneoides, Spanish moss) in coastal Georgia (Southeastern USA). Bacteria concentrations …

Resilience As A Mediator Of The Relationship Between Negative Life Events And Psychological Well-Being, Anna L. Faircloth

Electronic Theses and Dissertations

The relatively young field of positive psychology serves to redirect the focus of common psychological investigation and intervention on factors that deplete well-being, toward characteristics and experiences that promote happiness and well-being (Seligman & Csikszentmihalyi, 2000). Two features that have been consistently associated with measures of psychological well-being are resilience and negative life events (Avey et al., 2010; Shonkoff et al., 2012). The current study examined the relationship between negative life events, well-being, and resilience. Specifically, the study was designed to determine if resilience mediates the relationship between negative life events and psychological well-being among emerging adults. Participants were 325 …

A Journey To Fuzzy Rings, Brett T. Ernst

Electronic Theses and Dissertations

Enumerative geometry is a very old branch of algebraic geometry. In this thesis, we will describe several classical problems in enumerative geometry and their solutions in order to motivate the introduction of tropical geometry. Finally, fuzzy rings, a powerful algebraic framework for tropical and algebraic geometry is introduced.

"Goo-Prone And Generally Pathetic": Empathy And Irony In David Foster Wallace's Infinite Jest, Benjamin L. Peyton

Electronic Theses and Dissertations

Critical considerations of David Foster Wallace’s work have tended, on the whole, to use the framework that the author himself established in his essay “E Unibus Pluram” and in his interview with Larry McCaffery. Following his own lead, the critical consensus is that Wallace succeeds in overcoming the limits of postmodern irony. If we examine the formal trappings of his writing, however, we find that the critical assertion that Wallace manages to transcend the paralytic irony of his postmodern predecessors is made in the face of his frequent employment of postmodern techniques and devices. Thus, there arises a contradiction between …

Electroencephalographic Signal Processing And Classification Techniques For Noninvasive Motor Imagery Based Brain Computer Interface, Md Erfanul Alam

Electronic Theses and Dissertations

In motor imagery (MI) based brain-computer interface (BCI), success depends on reliable processing of the noisy, non-linear, and non-stationary brain activity signals for extraction of features and effective classification of MI activity as well as translation to the corresponding intended actions. In this study, signal processing and classification techniques are presented for electroencephalogram (EEG) signals for motor imagery based brain-computer interface. EEG signals have been acquired placing the electrodes following the international 10-20 system. The acquired signals have been pre-processed removing artifacts using empirical mode decomposition (EMD) and two extended versions of EMD, ensemble empirical mode decomposition (EEMD), and multivariate …

Design And Performance Analysis Of Small Scale Horizontal Axis Wind Turbine For Nano Grid Application, Md Mehedi Hasan

Electronic Theses and Dissertations

Wind energy, being easily accessible, environmentally friendly, and being cost effective, has become one of the world’s popular growing renewable energy sources of electricity generation. To spread this technology to mankind it is necessary to develop turbines in this way that people can use it individually and comfortably. This kind of thinking accelerates the advancement of integration of wind turbine with Nano grid concept. Although significant progress has been achieved in the wind technology, there is still scope to reduce the cost and improve the performance of small-scale wind turbines. Moreover, low wind velocity should also need to be utilized …

The Effect Of A Pettlep Imagery Intervention-Based Pre-Performance Routine On Golfer's Short-Game Performance, Logan Baughman

Electronic Theses and Dissertations

Studies have suggested that imagery has a positive effect on performance in a variety of sports. The PETTLEP model (Holmes and Collins, 2001) includes the seven minimum elements sport psychologists incorporate into their imagery scripts. The PETTLEP model is the most comprehensive imagery model, thus providing the most functional equivalence. Golf is the interest of this study, with research stating that imagery has an overall positive impact on golf performance (Nicholls & Polman, 2005). However, studies involving the PETTLEP model have not been investigated thoroughly. There are several shots that have not been studied with the PETTLEP model, therefore this …

The Influence Of Coach Leadership Behavior And Authenticity On Burnout Among Collegiate Athletes, William Ryan

Electronic Theses and Dissertations

The purpose of this study was to determine if coach authenticity and leadership behavior can influence burnout in collegiate athletes. By using congruency rooted in the multi-dimensional model of leadership and the leadership scale for sport, a mediating variable of authenticity, and a criterion variable of burnout, it was hypothesized that coach authenticity and congruence in the coach-athlete dyad, will influence rates of burnout evidenced by their ability to account for a significant proportion of the variance associated with burnout. The data analysis used in this study was a meditational analysis, which examined how coach-authenticity and congruency predict athlete burnout.

The Effect Of Repetitive Head Impacts On Postural Control Over The Course Of A Single Season, Katelyn E. Grimes

Electronic Theses and Dissertations

INTRODUCTION: Recently neurocognitive dysfunction has been linked to poor postural control in concussed athletes. While the detrimental effect of repetitive head impacts on cognitive function have been shown to mirror the effects of concussive injury, very little research has investigated the physical consequences of repetitive head impacts. PURPOSE: To observe the effects of RHI on postural control, both static and dynamic, in NCAA Division I athletes over the course of a single season. METHODS: 9 NCAA Division I football athletes (CON) were recruited from a single university as the experimental group, as well as 9 NCAA Division I baseball players …

A Forgotten Confederate: John H. Ash's Story Rediscovered, Heidi Moye

Electronic Theses and Dissertations

A historical study of a southern family living in Savannah, GA from shortly before the election of 1860 through the Civil War years based on the journals of John Hergen Ash II (1843-1918).

White Actors In The Civil Rights Movement: Social Progressives In Americus, Georgia, Garret A. Moye

Electronic Theses and Dissertations

This research explicates the complexity of race relations between whites and blacks during the mid-twentieth century by using the story of Koinonia Farm (now Koinonia Partners) in Americus, Georgia. Founded in 1942, Koinonia actively practiced and promoted equality between all ethnicities and emerged as a vanguard for liberal policies over a decade before the Civil Rights Movement reached Sumter County. Notably, Koinonians effected this change while refusing to engage or align with either the white liberal movement or the Civil Rights Movement, electing to avoid politicization of their endeavors in hopes of inspiring what they felt to be a truer …

Producing A College Graduate Using Retention, Progression, And Graduation (Rpg) Initiatives: A University Systems’ Approach, Deborah N. Kittrell-Mikell

Electronic Theses and Dissertations

ABSTRACT

Complete College Georgia (CCG) is an initiative that has the University System of Georgia institutions strategizing ways to develop plans that will increase the number of college graduates by the year 2020. Governor Nathan Deal has indicated that graduation rates need to increase from 42% to 60% within the next 7 years. With the anticipation of approximately 20% more students graduating to meet the 250,000 target, a closer look is needed at how an additional 50,000 graduates can be produced to make this goal a reality. To fulfill this goal, there needs to be an increase of approximately 7,143 …

Design And Modeling For Dc Nanogrids, Ormond D. Castle

Electronic Theses and Dissertations

Smart grids were constructed as a means of communication to the electric grid through computer and other information technologies. This line of communication acts as gauge for a more accurate reading of power consumed. A nano grid is a model version of a smart grid with the ability to function as separate power generator. Such feature allows for this grid to power single loads and apply for special applications. A DC-DC converter was designed to apply to a nano grid which is a form of a smart grid. The converter was a single-input-multi-output converter which is taking one dc voltage …

Heart Rate Recovery And Blood Pressure Recovery Influenced By A Slow-Breathing Protocol After Exercise In Moderately Trained Females, Emily Layne Zumbro

Electronic Theses and Dissertations

Heart rate (HR) and blood pressure (BP) increases in order to meet metabolic demands as a result of exercise primarily through way of the sympathetic nervous system (SNS) and parasympathetic nervous system (PNS). This study aimed to build on previous research in finding the best method to rapidly decrease HR and BP after exercise during the recovery period. PURPOSE: The purpose of this study was to determine the effectiveness of a breathing technique on HRR and BPR within a healthy female population during an exercise recovery period compared to active recovery and upright passive recovery. METHODS: Nine moderately trained female …

Development Of A Molecular Assay For Caribbean Coral Identification, Elijah D. O'Cain

Electronic Theses and Dissertations

As coral cover has declined throughout the Caribbean, interest in the role that recruitment processes play in reef recovery has increased. Studies investigating these processes have been hampered by the inability to identify many species of coral larvae or recently settled recruits using morphology. In this study, the utility of targeting the non-coding internal transcribed spacer (ITS) regions with a multiplex PCR assay to identify common Caribbean coral species was explored. To design this assay, a database of ITS sequences was developed for 17 Caribbean scleractinian coral species that are important reef builders and/or common in the Florida Keys. It …

The Difference In Academic Achievement For Students In The Healthy Fitness Zone Compared To The High Risk Zone For Bmi And Aerobic Capacity, Nathan C. Pennington

Electronic Theses and Dissertations

Childhood obesity rates have climbed significantly over the past 40 years. With that, there has also been an increase in the number of associated health concerns, such as diabetes, heart disease, and asthma, of many. Quite independently, there has also been an increase in the accountability placed on schools to improve their reading and math test scores. This has resulted in a decrease in physical activity times in schools in order to provide more class time for reading and math. This study’s purpose has been to identify whether a difference exists in academic outcomes for students in the HFZ compared …

The Role Of Habitat Management In Shaping Predation, Animal Color, And Gene Flow In A Metapopulation Of Florida Scrub Lizards (Sceloporus Woodi), Richard William Orton

Electronic Theses and Dissertations

Anthropogenic disturbance is known to affect biological diversity at the community, species, and genetic levels. Habitat fragmentation, in particular, has been shown to impact predator abundance and distribution, impede dispersal, and augment genetic drift. In small populations, which often result from habitat fragmentation, the effects of human disturbance may be disproportionately expressed. Small populations are more susceptible to selection pressures and random drift because genetic and phenotypic frequencies can become rapidly fixed, in comparison to larger populations. In turn, fixation of maladaptive alleles or morphs can accelerate extinction. For example, cryptic color polymorphism can be maintained by apostatic selection, where …

The Effects Of Beetroot Juice On Vo2max And Blood Pressure During Submaximal Exercise, Jose M. Perez

Electronic Theses and Dissertations

Supplementation with beetroot juice (BR) has been shown to reduce blood pressure (BP) at rest and improve several performance parameters during submaximal and maximal exercise. BR effects on BP during submaximal exercise have not been investigated. Furthermore, the effects of BR on VO₂max are inconclusive. The purpose of this study was to investigate the effects of BR on VO₂max and BP during submaximal exercise. 20 healthy, recreationally trained volunteers (age 21.8±2.35 years, weight 75.10±10.62 kg, height 177.4±6.39 cm) participated in this study, which had a double-blind placebo controlled randomized crossover design. Participants began supplementation with either …

Secure Cloud Controlled Software Defined Radio Network For Bandwidth Allocation, Isaac J. Cushman

Electronic Theses and Dissertations

The purpose of this research is to investigate the impact of mobility of wireless devices for opportunistic spectrum access and communications using National Instrument Universal Software Radio Peripherals devices. The overall system utilizes software defined radio networks for frequency allocation, cloud connectivity to maintain up-to-date information, and moving target defense as a security mechanism. Each USRP device sends its geolocation to query the spectrum database for idle channels. The cloud cluster was designed for complex data storage and allocation using a smart load balancer to offer ultra-security to users. This project also explores the advantages of data protection and security …

The Bessel Function, The Hankel Transform And An Application To Differential Equations, Isaac C. Voegtle

Electronic Theses and Dissertations

In this thesis we explore the properties of Bessel functions. Of interest is how they can be applied to partial differential equations using the Hankel transform. We use an example in two dimensions to demonstrate the properties at work as well as formulate thoughts on how to take the results further.

Concussion Knowledge And Understanding In Ghsa Guardians, Chloe C. Salway

Electronic Theses and Dissertations

Context: Concussions are a serious injury that could result in both short and long-term consequences, particularly if not recognized and managed appropriately. Concussion education has been implemented, mostly as a result of Concussion legislation. Coach and athlete concussion education has been evaluated in the literature, however the literature is scarce on parental concussion education.

Purpose: To assess concussion knowledge and understanding in guardians of Georgia High School Association (GHSA) student-athletes that completed the GHSA concussion awareness form, in comparison to those that received additional concussion education.

Methods: This study utilized a prospective cross-sectional descriptive research design. Participants were GHSA guardians …

Investigating Problems Associated With Patient Care Reports And Transferring Data Between Ambulance And Hospitals From The Perspective Of Emergency Medical Technicians, Smiljana Cuk

Electronic Theses and Dissertations

Many hospitals have switched to electronic records but emergency medical services continue to use some paper-based reports. Ambulances that have electronic-based systems use them only internally because they are not integrated with hospitals’ systems. This study investigated problems with paper-based, computer-based reports, and transferring patients and their information from an ambulance to the emergency department. Emergency medical technicians were interviewed using qualitative methods. After coding and analyzing their answers, results showed that all emergency medical technicians would like to see a change from paper to electronic transfer of information and that it was difficult to write the report while riding …

Puzzled Representations: Popular Media And How Educators Come To Know Autism, Vanessa N. Keener

Electronic Theses and Dissertations

People learn about the world through popular culture. Popular culture media representations of autism can be found in TV, film, literature, Internet media, advertisements, and more. This study employed a quantitative correlational design to survey 273 Georgia educators regarding their perceptions of autism, including knowledge about autism, best practices for teaching students labeled as having autism, perceived positivity and accuracy of popular media representations of autism, as well as participant identification with popular media representations of autism and personal characteristics (i.e., age, sex, level of education, type of degree, years of teaching experience, professional and personal experiences). Six major findings …

Impact Of Purposeful Professional Learning On Instructional Technology Integration In Daily Classroom Practices, Julie Chance

Electronic Theses and Dissertations

The Innovative Teacher Technology Project (ITTP) was designed and created to address the common misconception that teachers should be able to pull technology, both hardware and software, out of the box and begin appropriate integration with teaching and learning. ITTP was developed within a school system that continues to deal with the aftereffects of a nationwide recession and ongoing funding cuts from local, state and federal sources. While ITTP appeared to be working well, it had yet to be determined if the purposeful professional learning that occurred had an impact on the integration of instructional technology in daily classroom practices. …

Relationship Between School Climate And Student Achievement, Gail H. Greenway

Electronic Theses and Dissertations

Increasingly public schools in the United States are finding that factors beyond curriculum and instruction impact student achievement. Much research has been conducted on the relationship between school climate and student achievement (Cohen, McCabe, Michelli, & Pickeral, 2009; Guo & Higgins-D’Alessandro, 2011). This study set out to determine if there was a correlation between school climate and student achievement in middle schools in the Central Savannah River Area Regional Educational Service Agency region in the state of Georgia. Findings from this quantitative study indicated that there is a statistically significant, positive relationship between school climate and student achievement in middle …

Evolutionary Linkage Of Mimetic And Non-Mimetic Color Traits In A Coral Snake Mimicry Complex, John D. Curlis Jr

Electronic Theses and Dissertations

Color polymorphism in aposematic mimicry systems is a perplexing phenomenon for evolutionary biologists, as theoretically the benefits of converging on a model phenotype should constrain the evolution of phenotypic diversity in these systems (i.e., color polymorphism should not occur). Nevertheless, color polymorphism in mimicry systems is prevalent throughout many taxa. In some of these systems, the evolution of color polymorphism results in the existence of non-mimetic morphs, such as those that are cryptic. The case of ground snakes (Sonora semiannulata) is unique in that color polymorphism encompasses both mimetic and cryptic morphs, as well as individual mimetic and …