Digital Commons Network^™

A Modular Framework For Multi-Rotor Unmanned Aerial Vehicles For Military Operations, Dante Tezza

USF Tampa Graduate Theses and Dissertations

Multi-rotor Unmanned Aerial Vehicles (MR-UAV) are commonly used in a wide range of military operations. However, current MR-UAV models have limited payload capabilities and flight time, making it impractical for a single system to be well-suited for different applications. For instance, a drone designed to carry heavier equipment is not well suited for uses that require agility and speed. Therefore, military organizations employ multiple MR-UAV models, leading to complex logistics, training, and overall increased costs.

This dissertation presents a modular MR-UAV framework that allows a user to quickly tailor the aircraft for different military operations by easily changing modular parts …

Struggling Against The Odds: Social Movements In Pakistan During Authoritarian Regimes, Sajjad Hussain

USF Tampa Graduate Theses and Dissertations

This dissertation extends scholarship on the role of social movements against authoritarian regimes. It argues that movements turn into popular mobilizations and achieve successful outcomes when they occur in the consolidated phases of authoritarian regimes. Using the political opportunity structure framework, the dissertation maintains that a regime’s stability instils confidence in it to substitute coercion with incentives wherein it allows limited but strictly regulated freedoms for oppositional politics. This creates new openings for the challengers, enabling mobilization with an increase in size and scope. Unlike the initial phase, when the regime is consolidating and repressing collective action in a ruthless …

Assessment Of The Environmental Sustainability Of A Small Water Production Facility In Madagascar, Jesal Patel

USF Tampa Graduate Theses and Dissertations

Nearly 2.2 billion people around the globe struggle with access to safely managed drinking water (WHO/UNICEF, 2019), however, there have been certain initiatives taken, particularly by means of small water production facilities for enhancing access to basic drinking water services in rural areas. The water production facility, specifically located in the low- and middle-income countries, usually encounter operational difficulties as a result of limited availability of resources and are required to depend on other resourceful countries for goods and services. Although, with limited research done for assessing the environmental sustainability of water facilities in low- and middle-income countries, numerous data …

Efficient Post-Quantum And Compact Cryptographic Constructions For The Internet Of Things, Rouzbeh Behnia

USF Tampa Graduate Theses and Dissertations

IoT systems often rely on low-end devices to send measurements to other parties and depending on the setting, unauthorized alteration and/or privacy violation of these measures can have catastrophic consequences (e.g., embedded medical sensors). Therefore, providing efficient authentication, integrity, and confidentiality in these settings is vital. While conventional cryptographic measures (e.g., ECDSA) can be used to meet these security requirements, despite their elegant design, they are often too computationally expensive for low-end devices. This is further exacerbated when security against quantum computers is taken into the account.

In this dissertation, we propose a series of new efficient conventional and post-quantum …

Design, Development, And Evaluation Of An Artificial Intelligence-Enabled Chatbot For Honors College Student Advising In Higher Education, Reginald Saint-Aude Lucien

USF Tampa Graduate Theses and Dissertations

Academic advising is seen increasingly as an essential function supporting the educational mission of universities. Institutions have made significant investments supporting academic advisors and student success initiatives by leveraging technology resources such as Canvas and Degreeworks. There is a rising need for technology that can assist academic advisors in their responsibility to guide students along the path to academic success and AI resources that promote more efficient use of human capital are positioned to meet that need. Chatbot applications can serve as a technology-mediated intervention for delivering information and interactive content to support student success.

This study aimed to design, …

Political Ideologies, Political Party Affiliation, And Treatment Decisions Of Clinical Mental Health Counselors, Aaron L. Norton

USF Tampa Graduate Theses and Dissertations

Literature in the counseling profession has emphasized the importance of recognition of the potential impact of counselor bias on clinical care for decades. A large body of research has been developed on the potential for the personal, social, and religious beliefs of clinical mental health counselors (CMHCs) to impact their work with clients, but comparatively little research has been conducted on the potential impact of the political beliefs of CMHCs and their clinical practice, creating a gap in the professional literature. The present study sought to bridge the gap in CMHC literature by examining the relationship between the political ideologies, …

Techno-Economic Analysis Of Polyethylene Terephthalate Bio-Upcycling, Benard Nyawanga

USF Tampa Graduate Theses and Dissertations

Plastics have been used in almost every household appliance and various industrial applications for more than one hundred years. Plastic is among the most used materials in manufacturing worldwide. Plastic is cheap, light, durable, flexible, non-toxic, etc., and these properties make it suitable to use in manufacturing many types of appliances and materials. There has been an excessive reliance on plastic, leading to mass production. Despite being overly produced, there has been very little effort to recycle plastic, leading to massive accumulation of this environment. Plastic wastes are found in large patches in the world's oceans, waterways, and land. In …

Automatic Detection Of Vehicles In Satellite Images For Economic Monitoring, Cole Hill

USF Tampa Graduate Theses and Dissertations

With the growing supply of satellites capturing images of the planet, governments andinvestors are looking for ways in which these new images may be used to determine which businesses are struggling and thriving. Recent works have shown that parking lot fill rates can provide valuable information about businesses’ earnings, however, the task of manually annotating the number of vehicles in a parking lot is expensive and time-consuming. Systems which can automate this process are therefore valuable as they are faster and cheaper than human labor. In this thesis, the problem of detection of small objects in large low-resolution images is …

Exploring How A University’S Veteran Services Office Supports Their Students’ Civilian Career Readiness And Transition, Sasha M. Vanterpool

USF Tampa Graduate Theses and Dissertations

The purpose of this explanatory case study was to learn how a designated veteran services office on a university campus supports student veterans preparing to transition into the civilian workforce after their college graduation. This study provided an in-depth understanding of the operations of a nationally recognized veteran services office by sharing the perspectives of the office staff as well as the experiences of the veteran students who have used the office. Qualitative research methods for data collection and analysis were incorporated through semi-structured interviews, observations, and thematic coding analysis guided by a constructivist paradigm and Schlossberg’s Transition Theory as …

Self-Protection In Cyberspace: Assessing The Processual Relationship Between Thoughtfully Reflective Decision Making, Protection Motivation Theory, Cyber Hygiene, And Victimization, C. Jordan Howell

USF Tampa Graduate Theses and Dissertations

The current study, using structural equation modeling, assesses the processual relationship between thoughtfully reflective decision making (TRDM), theoretical constructs derived from protection motivation theory (PMT), cyber hygiene, and online victimization to determine the cognitive decision-making process that leads to the adoption of online self-protective behaviors, which reduces the occurrence of victimization experiences. Findings, derived from a general sample of Internet users in the United States, reveal: (1) engagement in cyber hygiene practices, as a form of target hardening, decreases Internet users’ experiences with online victimization; (2) thoughtfully reflective decision makers, in the face of cyber threats, develop higher threat appraisals …

Arab Undergraduate Students' Perceptions Of Their Transition To Learn Mathematics In English In The United States, Annetta Hastings

USF Tampa Graduate Theses and Dissertations

The number of students who choose to pursue higher education outside their home country has continued to grow, and one of the most popular international destinations is the United States. International students, whose home language is not English, can find this educational opportunity to be academically challenging. Institutions of higher learning can admit international students and expect them to adjust to the linguistic, cultural, and social differences in a new educational system without appropriate support. To better support international students in undergraduate mathematics, researchers have focused on how language and culture affect mathematical understanding (Barton & Neville-Barton, 2003; Durand-Guerrier et …

Investigating The Novel Role Of Dextromethorphan In Mitigating Oxidative Stress Induced Changes In Retinal Pigment Epithelial Cells (Rpe), Zeinab A. Mohamed

USF Tampa Graduate Theses and Dissertations

Oxidative stress contributes to the degeneration of retinal pigment epithelial (RPE) cells and photoreceptors that lead to the dry form of age-related macular degeneration. Activation of N-Methyl-D-aspartate (NMDA) receptors contributes to the increase of free radicals that induce oxidative stress-induced changes. Our study investigates if Dextromethorphan, an NMDA receptor antagonist, reverses oxidative stress-induced changes in RPE. We used Paraquat and H2O2 as oxidative stress-inducing agents to induce oxidative damage in human ARPE-19 cells. To illustrate the change in cell viability and measure the apoptosis of ARPE-19 cells from oxidative damage, we performed MTT assay and Annexin V-DAPI flow cytometry analysis. …

Moving Science To Practice: Exploring Implementation Practice Capacity In Community Settings, Enya B. Vroom

USF Tampa Graduate Theses and Dissertations

Due to the significant prevalence of mental and substance use disorders in the United States, the push for the development and implementation of evidence-based practices (EBPs) has grown exponentially in the last 30 years. Community-based organizations (CBOs) (i.e., self-governing and/or not-for profit) have been identified as significant providers of behavioral health services. However, there are gaps in the literature surrounding CBO implementation capacity, meaning their ability to adopt, implement, and sustain EBPs. There is a need for more research examining capacity training initiatives that specifically target CBOs and implementation practice. The purpose of this dissertation research was to investigate how …

Efficient Hardware Constructions For Error Detection Of Post-Quantum Cryptographic Schemes, Alvaro Cintas Canto

USF Tampa Graduate Theses and Dissertations

Quantum computers are presumed to be able to break nearly all public-key encryption algorithms used today. The National Institute of Standards and Technology (NIST) started the process of soliciting and standardizing one or more quantum computer resistant public-key cryptographic algorithms in late 2017. It is estimated that the current and last phase of the standardization process will last till 2022-2024. Among those candidates, code-based and multivariate-based cryptography are a promising solution for thwarting attacks based on quantum computers. Nevertheless, although code-based and multivariate-based cryptography, e.g., McEliece, Niederreiter, and Luov cryptosystems, have good error correction capabilities, research has shown their hardware …

Effect Of Se Composition In Cdse1-XTEx/Cdte Solar Cells, Sheikh Tawsif Elahi

USF Tampa Graduate Theses and Dissertations

Cadmium Telluride solar cell is a leading thin film photovoltaic in the market today. Constant enhancement of efficiency in the last decade has made its position firmer in research interest as well. The record cell efficiency for CdTe solar cells is 22.1%. The theoretical limit suggests that there is still room for efficiency improvements. Reducing the band gap of CdTe solar cells can improve the short circuit current and overall cell performance.

This work focuses on bandgap engineering of the CdTe layer by incorporating Selenium (Se) in to form the compound CdS_exTe_1-x (CST) which can have a …

Longitudinal Trajectory Tracking Analysis For Autonomous Electric Vehicles Based On Pid Control, Hossein Amiri

USF Tampa Graduate Theses and Dissertations

The implementation of autonomous vehicles has huge potential for revolutionizing transportation as we currently know it. All use cases of autonomous vehicles require the vehicle to travel on a pre-specified path. Accurate tracking of this defined trajectory is a crucial aspect of the implementation of autonomous vehicles; a controller system is required to translate this pre- defined trajectory in the form of the throttle, brake, and steering inputs. This project covers the application of a Proportional-Integral-Derivative (PID) controller to achieve longitudinal trajectory tracking of autonomous electric vehicles with stability and accuracy in the CARLA autonomous driving simulation platform. The implemented …

Passive Nitrifying Biofilters For Onsite Treatment Of Saline Domestic Wastewater, Daniel Arnulfo Delgado

USF Tampa Graduate Theses and Dissertations

The infrastructure to support the growing world population has polluted many water bodies with nitrogen from urban and agricultural runoff and failing wastewater systems, such as improperly sited and maintained septic systems. Septic systems present a low energy and maintenance option to treat domestic wastewater and is a treatment option that can be done far from a centralized grid. This further reduces cost, maintenance, and energy as it reduces the need to build and maintaining sewage piping and the infrastructure to move the water longer distances. However, these systems tend to fail when their upkeep is left to homeowners that …

Prediction Of The Effects Of Turbulence On Vehicle Hydroplaning Using A Numerical Model, Thathsarani Dilini Herath Herath Mudiyanselage

USF Tampa Graduate Theses and Dissertations

Pneumatic hydroplaning has been identified as one of the major causes of wet weathertraffic accidents. Therefore, knowledge of potential hydroplaning speeds is crucial in designing roadways to reduce crash risks. It has been shown that the tire inflation pressure is the predominant factor affecting the hydroplaning speed while factors such as the water film thickness also contribute heavily to this phenomenon. Extensive research has been directed at the development of accurate models to predict the effects of vehicle characteristics, pavement conditions and water film thickness on hydroplaning. Current literature does not indicate any studies directed at understanding the effects of …

Warming Up And Cooling Down: Perceptions And Behaviors Associated With Aerobic Exercise, Balea J. Schumacher

USF Tampa Graduate Theses and Dissertations

This study investigated the perceptual and behavioral responses regarding the use of warm-ups and cool-downs in aerobically active adults. There were 79 individuals who volunteered to participate in this study. Respondents were recruited by word of mouth or through social media and the Qualtrics survey link/QR code was on all recruitment materials in order to access the survey. The survey consisted of 47 questions. This study aimed to determine whether age, sex, or exercise location impacted perception or behavior related to warm-up and/or cool- down activities before or after the aerobic training exercise sessions. Primary results indicated the following: 1) …

Understanding The Leaching Mechanism For Lead (Pb) Found In Components Of Locally Manufactured Handpumps In Eastern Madagascar, Nidhi Shah

USF Tampa Graduate Theses and Dissertations

This research sought to determine the lead leaching mechanism impacted by an inorganic scale observed from lead valve weights of the pitcher pump systems used in Tamatave, Madagascar. Based on previous research, these valve weights are considered to be a major source for high lead levels in pump water consumed by the residents. As a part of the study, Raman Spectroscopy, X-ray Fluorescence Spectroscopy (XRF) and Energy Dispersive Spectroscopy with Scanning Electron Microscope (SEM-EDS) were performed to address the objectives of this research. The pump component samples for the analysis were selected based on the amount and visual characteristics of …

Building And Characterizing A Lab-Scaled Aquifer Storage And Recovery System, Murat Can Kayabas

USF Tampa Graduate Theses and Dissertations

To use Aquifer Storage and Recovery (ASR) as a water treatment and storage method, we must understand the fate and behavior of potential contaminants in the system. Knowing more about the aquifer properties such as dispersivity will enable us to assess how the target chemicals behave in the system. Characterizing the aquifer by using a tracer is a good way to estimate dispersivity since the tracer is not adsorbed or degraded. This study aims to build a lab-scale physical model of a confined aquifer to simulate an ASR system, verify its hydraulic functionality, and characterize the hydraulics of the aquifer …

The Value Of Sleep: Aura And Aesthetics Of Cohabitation In Juha Lilja's Revision Of Warhol, Christopher Costabile

USF Tampa Graduate Theses and Dissertations

This thesis positions Juha Lilja’s 2013 digital video work, Sleep, as a prime example of what the author terms an “aesthetics of cohabitation” — a newly suggested method of artistic creation set in opposition to capitalist society’s commodification of both space and time, represented here through the work of Robert Hassan and Jonathan Crary. Lilja’s eight-hour-long video work, which is accessible on YouTube, is a reimagining and re-envisioning of Andy Warhol’s film of the same name. It subverts the intended function of digital streaming platforms while using digital technology to meet aesthetic criteria in shot length and overall duration, which …

A Comparative Study Of Male And Female Undergraduate Computer Science Students’ Educational Pathways, Stephanie Fitzsimmons

USF Tampa Graduate Theses and Dissertations

Science, Technology, Engineering and Mathematics (STEM), including Computer Science (CS) are fields that are in great demand globally. This study’s purpose was to explore the nature of the educational pathways, critical factors and commonalities/differences leading to CS undergraduate enrollment through the male and female perspectives focusing on personal/home, academic/attitude and psychological factors underlying the Social Cognitive Career Theory factors. Purposive sampling method was used for this multi-case study, comprised of CS undergraduate upperclassman. Participants shared their perspectives on their CS educational pathway via three interviews and journals. Thematic analysis of narrative for both individual and cumulative group analysis, plus researcher …

Formulation And Characterization Of Raloxifene Nanostructured Lipid Carries For Permeability Enhancement Applications, Anju Sharma

USF Tampa Graduate Theses and Dissertations

Raloxifene (RLX), a BCS class-II drug is a selective estrogen receptor modulator (SERM)having estrogenic effect on bone and antiestrogenic effect on endometrium and breast respectively. Low solubility, high permeability, high metabolism and low bioavailability are the characteristics of raloxifene. It is used to prevent and treat in women and those on It is also used to reduce the risk of in those at high risk. Although 60% is absorbed orally, raloxifene shows extremely poor bioavailability (2%) owing to its low solubility and an extensive (>90%) intestinal/hepatic first-pass metabolism. Hence it becomes important to increase the solubility of raloxifene in …

Thermal Management Of Lithium-Ion Batteries Using Supercapacitors, Sanskruta Dhotre

USF Tampa Graduate Theses and Dissertations

As the market for renewable resources increases, the bandwidth of applications using Li-ion batteries as the primary source of energy also increases. Li-ion batteries are at a risk of undergoing thermal runaway under uncontrolled situations. Overcharging, over-discharging, high internal temperatures, etc. are all factors towards the gradual degradation of Li-ion battery performance. Therefore, it is important to have an efficient battery management system to ensure the smooth functioning of the battery.

Thermal management systems is an important aspect of the battery management system to keep battery temperatures under critical levels. Although, there are various methods of cooling down the battery …

Strategies In Botnet Detection And Privacy Preserving Machine Learning, Di Zhuang

USF Tampa Graduate Theses and Dissertations

Peer-to-peer (P2P) botnets have become one of the major threats in network security for serving as the infrastructure that responsible for various of cyber-crimes. Though a few existing work claimed to detect traditional botnets effectively, the problem of detecting P2P botnets involves more challenges. In this dissertation, we present two P2P botnet detection systems, PeerHunter and Enhanced PeerHunter. PeerHunter starts from a P2P hosts detection component. Then, it uses mutual contacts as the main feature to cluster bots into communities. Finally, it uses community behavior analysis to detect potential botnet communities and further identify bot candidates. Enhanced PeerHunter is an …

A Review Of The Class Pass Intervention: A Derivative Of Bedtime Pass, Peigelyn A. Dorno

USF Tampa Graduate Theses and Dissertations

The purpose of this paper was to review and synthesize the literature on both the bedtime pass (BPP) and the class pass intervention (CPI), a school-based intervention derived from the bedtime pass. Specifically, the objective of this paper was to discuss variations in the implementation of the class pass and bedtime pass that may impact the effectiveness of this intervention. A total of 11 articles, seven articles on CPI and four articles on BPP, were identified for this review through a search on EBSCO database and Google Scholar search engine. The articles identified were summarized in regard to the participant’s …

Recognizing Emotion In The Wild Using Multimodal Data, Shivam Srivastava

USF Tampa Graduate Theses and Dissertations

In this work, I will present our approach of using multi-modal data for recognizing human emotion and behavior in the wild. The study is divided into four tasks: group emotion recognition, driver gaze prediction, student engagement prediction, and emotion recognition using physiological signals. We explore multiple approaches including classical machine learning tools such as random forests, state-of-the-art deep neural networks, and multiple fusion and ensemble-based approaches. We also show that similar approaches can be used across tracks as many of the features generalize well to the different problems (e.g. facial features).

Comparison Of The Effectiveness Of Disinfectant-Impregnated Wipes Versus Detergent Wipes For Surface Decontamination, Jacob Amadin

USF Tampa Graduate Theses and Dissertations

Over time, there is an increased need to adopt more advanced and effective ways of disinfection. The emergence of the coronavirus-2019 (COVID-19) pandemic reminded the world on the importance of disinfection. Disinfection has been a routine in the healthcare setting. However, with the current pandemic problem, it is more prominently and persistently done in the domestic setting and other business settings beyond healthcare. As such, the use of most disinfectants and detergent wipes to achieve a near sanitized environment has become a common practice around the globe. This research presents the efficacy of disinfectant impregnated versus detergents wipes through comparison. …

Feasibility Of Epoxy Bond Enhancement On High-Strength Concrete, Amanda A. Lewis

USF Tampa Graduate Theses and Dissertations

While fiber-reinforced polymer materials have many applications in various industries,when used structurally, many cases, such as flexural and shear strengthening, are considered bond critical. Interfacial bond quality between a fiber-reinforced polymer system and the substrate is dependent on two mechanisms: chemical bonding and mechanical interlock, with mechanical interlock having the greater effect on bond quality. Mechanical interlock describes the type of bond that occurs as a result of surface roughness and substrate porosity and can be significantly affected by surface preparation methods and surface moisture. This study aims to explore the possibility of enhancing bond quality between carbon-fiberreinforced polymers and …