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Articles 2041 - 2070 of 50612
Full-Text Articles in Entire DC Network
Machine Learning Classification Of Drones, Birds, And Bird-Like Drones Using Radar Micro-Doppler, Camera Imagery, And Radar-Camera Fusion, Kester Magalong Nucum
Machine Learning Classification Of Drones, Birds, And Bird-Like Drones Using Radar Micro-Doppler, Camera Imagery, And Radar-Camera Fusion, Kester Magalong Nucum
Theses and Dissertations
Counter-drone systems employ sensors such as radars and cameras to detect, track, and identify drones. These systems can confuse birds with drones, and the advent of bird-like drones exacerbates this problem. This thesis explores radar micro-Doppler, camera imagery, and their fusion for drone and bird classification. First, micro-Doppler models of quadcopters, birds, and bird-like drones were developed to generate a dataset of synthetic spectrograms for training support vector machine, k-nearest neighbors, Naïve Bayes, and convolutional neural network (CNN) classifiers. Second, transfer learning was applied on YOLOv10, a recently developed You Only Look Once object detector model, to detect and classify …
Earth Analogue Analysis Of Volcanic/Tectonic Interactions With Applications To Venusian Stresses, Michael Ortigoza
Earth Analogue Analysis Of Volcanic/Tectonic Interactions With Applications To Venusian Stresses, Michael Ortigoza
Theses and Dissertations
Venus shares many geological similarities with Earth, yet its tectonic processes and magma injection mechanisms remain poorly understood. A key question in planetary geology is how effusive volcanism persists despite the intense horizontal compression terrestrial bodies experience over time. To explore these issues, we examine the Spanish Peaks dike swarm in Colorado which serves as an ideal site for investigating magma intrusion under compressive stress conditions. Through field mapping, orientation measurements, and structural analysis, we identify a strong relationship between pre-existing joints and dike orientations, suggesting that these fractures serve as critical magma pathways in compressive regimes. Additionally, evidence of …
Establishing A Baseline For Detecting Lotl Attacks In Windows Operating Systems, Ashlyn Martin Phillips
Establishing A Baseline For Detecting Lotl Attacks In Windows Operating Systems, Ashlyn Martin Phillips
Theses and Dissertations
There has been an increasing realization of the rise in living off the land (LOTL) attacks where adversaries misuse legitimate system tools, particularly with state-sponsored actors targeting critical infrastructure in the United States. These attacks are difficult to detect because they allow attackers to remain present in a system without the user’s knowledge for an extended period. This thesis establishes an initial baseline specifically for Windows operating systems to measure normal system activity, focusing on CPU usage, memory utilization, and process activity. It particularly examines the use of PowerShell alongside other applications. The findings from this baseline are used to …
Faculty Perceptions And Use Of Open Educational Resources In Postsecondary Stem Classrooms, Gabriel Posadas
Faculty Perceptions And Use Of Open Educational Resources In Postsecondary Stem Classrooms, Gabriel Posadas
Theses and Dissertations
This study examined how faculty in Science, Technology, Engineering, and Mathematics (STEM) or STEM-related fields perceive and utilize open educational resources (OER) in their classrooms and how faculty characteristics (e.g., age, teaching experience, OER experience) influence their adoption. A quantitative survey was administered to 48 STEM faculty across 8 colleges at a large, southeastern university. Findings revealed that faculty generally acknowledged OER’s benefits, particularly its cost-saving potential, and all faculty without prior OER experience and 86.5% of faculty with OER experience expressed neutral to positive perceptions regarding OER’s ability to reduce financial burdens. Faculty with OER experience also recognized its …
Removal Of Harmful Algal Bloom Toxin, Microcystin-Lr Via Graphene Coated Polymers, Justin Douglas Puhnaty
Removal Of Harmful Algal Bloom Toxin, Microcystin-Lr Via Graphene Coated Polymers, Justin Douglas Puhnaty
Theses and Dissertations
This study investigates a novel 3D-printed graphene-coated polymer (GCP) for the removal of Microcystin-LR (MC-LR), a harmful cyanotoxin produced during harmful algal blooms (HABs). While graphene nanoplatelets (GnPs) exhibit high adsorption capacity, their powdered form limits practical application. To address this, GnPs were coated onto 3D-printed poly(lactic acid) (PLA) substrates, enabling enhanced handling for field deployment. Surface characterization using laser confocal microscopy, Raman spectroscopy, and thermogravimetric analysis confirmed GnP distribution and coating uniformity. Batch adsorption experiments revealed pseudo-second-order kinetics, a maximum adsorption capacity (qmax) of 596 μg/g, and adsorption behavior best described by the Langmuir isotherm. Statistical analysis and comparison …
The Importance Of Community: An Investigation Of Stress, Coping, And The Value Of Social Support For First Responders, Brian Reid
Theses and Dissertations
People are designed to be in community with others, to work together and share the load and weight of life. First responders are a community that has not emphasized the importance of social support to mitigate and buffer against the stress inherent in their jobs. This study investigates the sources of stress, coping methods, and social support of first responders. Results from the first study show the impact of workplace and family stress on the first responder is impactful from the beginning. The secondary study finds that adaptive coping methods are the preferred method to cope with stress and that …
Movement, Microhabitat, And Metapopulations: Improving Our Understanding Of Gopher Frog (Rana [Lithobates] Capito) Ecology In Alabama, Krista Michelle Ruppert
Movement, Microhabitat, And Metapopulations: Improving Our Understanding Of Gopher Frog (Rana [Lithobates] Capito) Ecology In Alabama, Krista Michelle Ruppert
Theses and Dissertations
Gopher frogs (Rana [Lithobates] capito) are a species in decline in the southeastern United States. In Alabama, gopher frogs are a species of greatest conservation need, only known to consistently breed in two ponds in the south of the state; however, efforts to restore breeding ponds and to reintroduce metamorphs throughout their historic range are ongoing. The objectives of this dissertation were to assess trends in gopher frog ecology in Alabama to inform conservation plans. In chapter 2, I used radiotelemetry to assess the post-breeding movements of gopher frogs in 2021 and 2022. I found that frogs in Alabama moved …
Integrating Case Studies With Meteorologists’ Insight: Assessing Meteorologists’ Perception And Utilization Of Composite Indices, Brianna Marie Salazar
Integrating Case Studies With Meteorologists’ Insight: Assessing Meteorologists’ Perception And Utilization Of Composite Indices, Brianna Marie Salazar
Theses and Dissertations
Meteorologists from sectors, including broadcast, academia, and operations, use derived composite indices such as 0-1km and 0-3km energy helicity index (EHI), effective-layer supercell composite parameter (SCP), fixed-layer and effective layer significant tornado parameter (STP), in addition to other resources, when developing severe local storm forecasts. This study utilizes the Weather Research and Forecasting (WRF) model to create simulations of composite indices for two tornado-producing events: 31 March 2023 and 3 May 1999. With modifications to geographical location, these simulated scenarios are then utilized in the survey to gauge how meteorologists assess where tornado potential is highest. Additionally, a combination of …
Ecology And Management Of Alligatorweed (Alternanthera Philoxeroides) And An Associated Thrips Biological Control Agent (Amynothrips Andersoni), Samuel Alec Schmid
Ecology And Management Of Alligatorweed (Alternanthera Philoxeroides) And An Associated Thrips Biological Control Agent (Amynothrips Andersoni), Samuel Alec Schmid
Theses and Dissertations
Alligatorweed (Alternanthera philoxeroides), native to South America, is a highly invasive aquatic macrophyte that is globally distributed and particularly problematic in the southeastern United States. In the United States, alligatorweed management has a long history, particularly of chemical and biological control. Alligatorweed management saw early success with a South American flea beetle (Agasicles hygrophila), but this agent’s utility has waned. Despite the long history of alligatorweed invasion, several important research questions remain, and the research in this dissertation seeks to answer some of these questions. This research focuses on multiple and diverse aspects of alligatorweed biology, ecology, and management: (1) …
Measuring What Matters: A Policy Analysis Of Statewide Accountability Systems Through The Lens Of College And Career Readiness, Steven Deandre Shadwick
Measuring What Matters: A Policy Analysis Of Statewide Accountability Systems Through The Lens Of College And Career Readiness, Steven Deandre Shadwick
Theses and Dissertations
A disconnect exists between statewide accountability systems and college and career readiness (CCR) outcomes measured by the ACT and SAT. The goal of a statewide accountability system is to enable, implement, and support success for all students in areas that demonstrate high academic achievement through federal- and state-mandated metrics. Under the Every Student Succeeds Act (2015), states have been granted flexibility in how to measure CCR via a number of School Quality and Student Success (SQSS) indicators. Through a quantitative correlational design, data were collected from 44 states with ACT and SAT participation rates ≥ 90%, ≤ 10% or closest …
Projected Future Reservoir Impairment In The Conterminous United States Following Three Climate Change Scenarios, Darren James Shoemaker
Projected Future Reservoir Impairment In The Conterminous United States Following Three Climate Change Scenarios, Darren James Shoemaker
Theses and Dissertations
Anthropogenic climate change has been associated with reservoir aging and reduced ecosystem function. Communities throughout the world depend on reservoirs for services such as hydropower, drinking water, flood mitigation, and recreational opportunities. Though reservoirs were typically constructed to meet human needs, they are now also acknowledged as supporting biodiverse aquatic communities. Reservoir managers are expected to maintain services and biodiversity demanded by diverse users despite high uncertainty surrounding how climate will influence reservoirs through time. Additionally, data describing reservoir function at broad spatial extents are often either unavailable, incompatible between agencies, or prohibitively resource-intensive to obtain. Expert opinion surveys are …
Enhancing Profitability In The Air Transport Industry Through Improved Air Passenger Forecasting: A Comparative Analysis Of Arima, Holt-Winters And Lstm Time Series Forecasting Techniques, Megan Skowronek
Theses and Dissertations
Predicting air passenger volumes is crucial for airports and airlines seeking to reduce costs and enhance profitability. Accurate forecasting enables better planning and efficiency improvements within the air transport industry. This study applies LSTM, ARIMA and HW to U.S. air passenger datasets. Each analysis shows a methodology for predicting air passenger volumes across airports, airlines and across airports and airlines simultaneously. ARIMA was found to have limited applicability, since only a subset of the datasets was stationary. LSTM and HW were applicable to all airlines and ARIMA was applicable to no airlines. LSTM had less error compared to HW at …
Zeroizing Trust In A Naïve Federated Zero Trust Environment, Keith E. Strandell
Zeroizing Trust In A Naïve Federated Zero Trust Environment, Keith E. Strandell
Theses and Dissertations
The position of the United States on the global stage is predicated on information dominance and the ability to project power through cooperative engagements with mission partners in both wartime and peacetime. Recent cyber-attacks highlighted the need for a more robust cybersecurity posture. As the United States progresses toward the adoption of Zero Trust, it is incumbent on the Department of Defense to assess the impact to the ability to share data across strategic partnerships while securing the data of both the United States and its partners. This paper proposes research into ensuring an environment rooted in Zero Trust and …
Work-Life Balance And The Impact Of Covid-19 On Faculty At Historically Black Community Colleges (Hbccs), Taneshia Turner Winston
Work-Life Balance And The Impact Of Covid-19 On Faculty At Historically Black Community Colleges (Hbccs), Taneshia Turner Winston
Theses and Dissertations
This research study was conducted to determine how the COVID-19 pandemic affected the work-life balance of faculty at HBCCs based on their race, gender, age, marital status, and tenure status. The study employed a quantitative research design utilizing Exploratory Factor Analysis (EFA) to conduct time-based activities separately and group perception-based response variables into meaningful categories to uncover patterns. To analyze the differences in race, gender, age, marital status, and tenure status, Regression and Chi-square test analyses were used to evaluate the collected data. Regression analysis explored relationships between time spent on activities and perceptions of stress, productivity, and satisfaction. Chi-square …
Myxozoan Diversity And Life Cycles In Catfish Production Ponds In Mississippi, Usa, Ethan Woodyard
Myxozoan Diversity And Life Cycles In Catfish Production Ponds In Mississippi, Usa, Ethan Woodyard
Theses and Dissertations
Catfish aquaculture is a critical industry in the United States and Mississippi in particular. The industry is beset by depredation, rising feed costs, competition with imports, and loss to disease. Chief among these is the myxozoan parasite and causative agent of proliferative gill disease, Henneguya ictaluri. In chapter 2, novel molecular markers for greater resolution in species identification of these parasites are provided, allowing more robust life cycle inference, species-level identifications, and inference of evolutionary relationships through molecular phylogenetic analyses. Chapters 3–5 apply the approaches developed in Chapter 2 to a broad array of taxa beyond catfish-infecting Henneguya spp. These …
A Framework For Modular Knowledge Composition In Network Intrusion Detection Systems, Patrick L. Day
A Framework For Modular Knowledge Composition In Network Intrusion Detection Systems, Patrick L. Day
Theses and Dissertations
Autonomic Intrusion Detection Systems (AIDS) are sophisticated software systems designed to autonomously and adaptively identify and respond to security threats and intrusions in computer networks or systems. One of the fundamental challenges in intrusion detection research lies in the limited availability and scope of publicly available datasets. The proposed research aims to address data-related gaps with autonomic and traditional intrusion detection systems by describing a comprehensive approach to investigate the impact and potential of data augmentation. The goal is to explore various data augmentation techniques, assess their effectiveness in introducing variability, and evaluate their impact on the performance of neural-based …
Assessment Of Water Quality And Remediation Of Heavy Metals In A Coastal System, Christiana Fumnanya Eziashi
Assessment Of Water Quality And Remediation Of Heavy Metals In A Coastal System, Christiana Fumnanya Eziashi
Theses and Dissertations
This research focuses on a three-part study to assess water quality in a coastal system and evaluate the absorption capacity of modified biochar and algae to remediate cadmium (Cd). The first chapter introduces the hypothesis and objectives, and the second chapter provides a detailed literature review. The third chapter focuses on the first study, where surface water samples and water quality data collected from a manned boat and a novel autonomous surface vessel (ASV) in the Western Mississippi Sound (WMS) in the summer of 2021 and 2022 were analyzed and the interrelationship between the nutrient, trace metals, salinity, and chlorophyll-a …
Assessment Of Pagp Gene Function In Avian Pathogenic Escherichia Coli Pathogenicity Using Different Challenge Models, Hailey Fugate
Assessment Of Pagp Gene Function In Avian Pathogenic Escherichia Coli Pathogenicity Using Different Challenge Models, Hailey Fugate
Theses and Dissertations
Avian pathogenic Escherichia coli (APEC) is a leading cause of morbidity and mortality in poultry, contributing an estimated $40 million in annual losses in the U.S. broiler industry alone, and contributing to growing concerns over antibiotic resistance. This study investigated the role of the pagP gene, which encodes a lipid A palmitoyl transferase involved in immune evasion, using both a broiler chick and embryo challenge model. Deletion of pagP significantly reduced mortality and lesion severity in broilers, indicating its role in APEC pathogenicity. However, in embryos, pagP deletion had minimal effects on survival and bacterial colonization, suggesting alternative virulence mechanisms …
How Do Tuition Benefits Affect University Staff Retention, Social Connection, And Institutional Commitment?, Lian A. Harris
How Do Tuition Benefits Affect University Staff Retention, Social Connection, And Institutional Commitment?, Lian A. Harris
Theses and Dissertations
Employee retention is costly for many companies, including colleges and universities. Tuition benefits have been shown to be helpful in recruitment and retention. This study looked at how tuition benefits used by university staff members affected turnover intentions, workplace belonging and institutional commitment. Benefits eligible university staff members, who were in primarily non-teaching roles at one rural, four-years land grant university were asked to complete an electronic survey, and 250 responses were collected. To measure the variables of interest the survey combined scale items representing each of the dependent variables; turnover intention (Bothma & Roodt, 2013), workplace belonging (Jena & …
A Cloud Of Witnesses: Captivity Among The Society People Of Colonial Pennsylvania, Jenifer L. Ishee
A Cloud Of Witnesses: Captivity Among The Society People Of Colonial Pennsylvania, Jenifer L. Ishee
Theses and Dissertations
In 1760, Jean McCord Lowry published a journal detailing her three years of captivity among the Delawares of Pennsylvania and the French Catholic authorities in New France during the Seven Years’ War. Lowry was a member of a religious community known as the Society People that strictly adhered to the codes, rules, and ordinances of the Scottish National Covenant of 1638 and the Solemn League and Covenant of 1643. This sect emerged from a series of European imperial conflicts that led to internal divisions within the Covenanter community. The Society People in Scotland, Ireland, and colonial America believed themselves the …
Over And Under Identification Of Emotional Disturbance (Emd) In Minority Students: Implications For Best Practices In Emd Assessment, Danielle Chanell Jackson
Over And Under Identification Of Emotional Disturbance (Emd) In Minority Students: Implications For Best Practices In Emd Assessment, Danielle Chanell Jackson
Theses and Dissertations
Emotional Disturbance (EmD) remains one of the most inconsistently defined and assessed categories under the Individuals with Disabilities Education Act (IDEA), leading to widespread misidentification that disproportionately affects minority students. This study investigates systemic biases in EmD assessment practices, highlighting how subjective criteria and a heavy reliance on clinical judgment perpetuate disparities in identifying African American and Latino students in special education. To better understand these biases, the study sought to identify which assessment components school psychologists most frequently utilized when making eligibility determinations for EmD. Quantitative analysis revealed that while race was not a statistically significant predictor of EmD …
Evaluation Of Broiler Performance And Processing Metrics Through Sodium Bisulfate Application To Litter And Varying Inclusions In Feed, Samantha Suzanne Plocher
Evaluation Of Broiler Performance And Processing Metrics Through Sodium Bisulfate Application To Litter And Varying Inclusions In Feed, Samantha Suzanne Plocher
Theses and Dissertations
Poultry producers must continuously evaluate current practices and determine new ones to further optimize broiler production. Sodium bisulfate (SB) is used as a poultry litter amendment (SBL), but also in human food to control pH; thus, initiating interest for SB in feed (SBF) for performance and gut health benefits. This thesis utilized common diets varying in SBF (Chapters II and III) and SBL (Chapter II; SBL1- d 0 and SBL2 – d 0 and 18) to optimize 40 d broiler performance, litter quality, and d 41 processing metrics. For Chapter II, d 0 SBL1 dramatically lowered litter pH, while minimally …
Stakeholder Opinions On Design And Management Strategies At The Pharr Mounds Site, Lauryn Elizabeth Polito
Stakeholder Opinions On Design And Management Strategies At The Pharr Mounds Site, Lauryn Elizabeth Polito
Theses and Dissertations
The Pharr Mounds site along the Natchez Trace Parkway is a culturally significant burial location that is visited by thousands each year. This site is home to the remains of an ancient group of individuals that the current Chickasaw Nation are descended. To provide culturally sensitive management strategies, enhance visitor experience, and to analyze the perspectives of others on design solutions, a mixed-method approach including individual interviews and online surveys were used for three main stakeholder groups including members from the Chickasaw Nation, employees from the National Park service, and public site visitors. Questions addressed mound significance, site accessibility, interpretation, …
“Sometimes The World Don’T Give You What You Need”: Black Motherhood And Kinship As Resistance To Necropolitics In Jesmyn Ward’S Bois Sauvage, Hailey N. Reeder
“Sometimes The World Don’T Give You What You Need”: Black Motherhood And Kinship As Resistance To Necropolitics In Jesmyn Ward’S Bois Sauvage, Hailey N. Reeder
Theses and Dissertations
This thesis explores how Black motherhood and kinship serve as subversive forces within necropolitical landscapes in Jesmyn Ward’s Where the Line Bleeds, Salvage the Bones, and Sing, Unburied, Sing. Drawing on Achille Mbembe’s theory of necropolitics, this study examines how the economic and social constraints of these environments disrupt Black family structures, emphasizing the necessity of kinship for survival. In Where the Line Bleeds, Cille’s absence disrupts traditional family roles, yet kinship networks allow the family to endure. In Salvage the Bones, Esch’s journey redefines the “bad” Black teen mother stereotype, highlighting how kinship offers support amidst stigma. In Sing, …
Design And Evaluation Of A 5g Testbed: Analyzing Security Solutions, Iq Sample Management, And Performance Visualization, Mohammed Saleh Shaik
Design And Evaluation Of A 5g Testbed: Analyzing Security Solutions, Iq Sample Management, And Performance Visualization, Mohammed Saleh Shaik
Theses and Dissertations
The evolution of 5G networks has introduced new opportunities for high-speed, low-latency wireless communication, supporting a wide range of applications from industrial automation to secure data transmission. However, as 5G networks become more complex, ensuring security and maintaining optimal performance present significant challenges. This thesis explores the development of a 5G testbed using Software-Defined Radios (SDRs) and open-source platforms to analyze signal behavior, security implementations, and performance. The testbed, built with the open source srsRAN software library and widely available SDR hardware, serves as a controlled environment for studying 5G communications security features and innovations. To evaluate transmission characteristics, in-phase/quadrature …
A Fine-Tined Bert Model For Improved Querying Of The Unmanned Aerial System Integration Safety And Security Technology Ontology, Minh Hong To
Theses and Dissertations
The use of unmanned aerial vehicles (UAS) in all industries is steadily increasing every year. To govern the use of UAS, the Federal Aviation Administration (FAA) seeks to provide a foundation of rules and regulations for UAS operation in the National Airspace System (NAS). The UAS Integration Safety and Security Technology Ontology (ISSTO) was developed using the Web Ontology Language (OWL) in 2023. In 2024, a query application was developed to search ISSTO for information about the safety and security of UAS operations. While the application is functional, the search results can be further fine-tuned to match what the user …
Langston Hughes And The “Afro-American Narrative” Tradition, Paul Haynes
Langston Hughes And The “Afro-American Narrative” Tradition, Paul Haynes
Theses and Dissertations
After introducing Langston Hughes and defining Robert B. Stepto’s “Afro-American narrative” tradition, Chapter One presents a biography of Hughes from his birth in 1902 until he came under the patronage of Charlotte Osgood Mason in 1927. Chapter One also addresses the aesthetic expectations of the Harlem Renaissance and the extent to which Hughes either met or failed to meet those expectations. Chapter Two presents a reading of Not without Laughter as an integrated narrative, addressing how Hughes’s authenticating strategies and Mason’s authenticating devices evenly control the novel. Chapter Three presents a reading of Hughes’s short-story cycle, The Ways of White …
Prosodic Pitch And Intensity Patterns In People With Moderate Broca's Aphasia, Juliana Pickard
Prosodic Pitch And Intensity Patterns In People With Moderate Broca's Aphasia, Juliana Pickard
Theses and Dissertations
People with aphasia (PWA) experience deficits in utilizing prosody, which drastically impacts their communicative effectiveness. The lack of prosody in people with aphasia may alter their ability to nurture meaningful relationships, advance educational and work opportunities, and participate in community activities. This study acoustically evaluates the prosodic characteristics of speech produced by individuals with non-fluent aphasia to better understand how to accurately assess and more effectively treat communication difficulties in PWA. Recorded speech samples derived from a Cinderella story retell from 16 individuals with moderate Broca's aphasia and 16 age-matched controls were acoustically analyzed in this study. The recordings were …
Data In The Classroom: The Impact Of A Data-Centric, High School Program To Motivate Career Interest In Stem Fields, Tyler Stabiler
Data In The Classroom: The Impact Of A Data-Centric, High School Program To Motivate Career Interest In Stem Fields, Tyler Stabiler
Theses and Dissertations
This dissertation proposes to analyze the importance of introducing data-centric STEM (Science, Technology, Engineering, and Mathematics) studies at the high school level. In today's digital age, the importance of studying data-centric STEM in high school cannot be overstated. This dissertation looks to discover educational capabilities of high school students in various grade levels by understanding their drive, desire, and ambitions in a different STEM course than what is currently offered at the high school. Finally, the study analyzes the students’ participation in lectures, laboratory environment, and model/simulations to identify the significance in high schools adding data-centric curriculums to their academic …
Efficient Eeg Epilepsy Classification And Feature Selections Based On Hellinger Distance, Muhammed Sadiq
Efficient Eeg Epilepsy Classification And Feature Selections Based On Hellinger Distance, Muhammed Sadiq
Theses and Dissertations
Accurate and efficient detection of epileptic seizures from EEG signals remains a critical challenge due to high-dimensional data, class imbalance, and the limitations of standard classifiers. This thesis introduces two novel models to address these challenges. The first model presents a new classifier based on the Hellinger Distance, specifically designed to enhance discriminative capability and robustness against imbalanced datasets. By integrating the Hellinger Distance Classifier with Particle Swarm Optimization (PSO) for feature selection, this model significantly improves classification performance while reducing computational complexity. Experimental evaluations on the Bonn dataset demonstrate an accuracy of 96.25%, an F1-score of 97.74%, a recall …