Digital Commons Network^™

Persistent Relative Homology For Topological Data Analysis, Christian J. Lentz

Mathematics, Statistics, and Computer Science Honors Projects

A central problem in data-driven scientific inquiry is how to interpret structure in noisy, high-dimensional data. Topological data analysis (TDA) provides a solution via the language of persistent homology, which encodes features of interest as holes within a filtration of the data. The recently presented U-Match Decomposition places the standard persistence computation in a flexible form, allowing for straight-forward extensions of the algorithm to variations of persistent homology. We describe U-Match Decomposition in the context of persistent homology, and extend it to an algorithm for persistent relative homology, providing proofs for the correctness and stability of the presented algorithm.

Identifying Barriers: Analysis Of Federal Law Enforcement Social Media And Recruitment Efforts, Reena Desai, Edgar Greer, Meghan Waldron

Doctor of Education Capstones

The Federal Bureau of Investigation Richmond Field Office seeks to diversify their applicant pool. In an effort to provide information on how to meet this need, our doctoral team analyzed the social media sites of six federal law enforcement agencies to include: the Federal Bureau of Investigation- Headquarters, Federal Bureau of Investigation-Richmond Field Office, Alcohol Tobacco & Firearms, the Federal Bureau of Prisons, the Drug Enforcement Agency, and the United States Marshal Service. By examining a 60-day window of images and their associated text on X (formerly Twitter), Facebook, and Instagram accounts, we wanted to gain a stronger understanding of …

Belonging At A Historically White Institution: Understanding The Men Of Color Experience, Riley Cain Sisk, Tara J. Hefner, Kelsie N. Potter, Nicholas A. Williams

Doctor of Education Capstones

Sense of belonging is a vital need that supports an individual’s journey of becoming. Studies have shown the positive impact sense of belonging can have on education outcomes, especially for underrepresented communities. Consulting with the Assessment Office in the Division of Student Affairs (The DSA Assessment Office) at Virginia Commonwealth University (VCU), the research team sought to understand how men of color make sense of belonging at historically white institutions (HWIs) such as VCU. This qualitative, instrumental case study utilized a subjectivist approach grounded in Strayhorn’s (2019) definition of ‘sense of belonging’ paired with Baxter Magolda’s (2014) theories of self-authorship. …

Examining The Efficacy Of Unitive Justice Education In The Secondary School Setting, Chris C. Booz, La Toya K. Draper, Lottie M. Spurlock

Doctor of Education Capstones

This research study examined the efficacy of the Unitive Justice Education (UJEd) program on school-wide practices in Hopewell City Public Schools (HCPS). The UJEd program developed by the Alliance for Unitive Justice (AUJ) serves as a unifying alternative to conventional disciplinary approaches. An abundance of research shows exclusionary punitive systems have created inequitable experiences for students, particularly children from historically marginalized groups (Alexander, 2020; Kendi, 2019; Morris, 2018). Through a critical theory lens (Freire, 2017) coupled with a mixed methods approach, the researchers analyzed the HCPS discipline data and staff perceptions. Implementing the UJEd program in HCPS secondary schools holds …

A Path Toward Healing: Parent And Caregiver Perspectives On The Work Of Restorative Practices Richmond At Martin Luther King, Jr. Middle School, Jean Samuel, Silvanus Thrower, Jill Flynn, Brandi Daniels

Doctor of Education Capstones

To address how key stakeholders experience restorative practices (RP), Restorative Practices Richmond (RPR) submitted a request for assistance (RFA) to Virginia Commonwealth University. This single case study responds to the RFA by examining how parents, caregivers, and community partners perceive school discipline and restorative practices and how this understanding supports RPR’s work to support restorative practices at Martin Luther King Middle School (MLK MS). Through a social justice lens, this capstone explores the challenges and needs of parents, caregivers, and community partners engaging with restorative practices. The findings that emerged included the following: parents and caregivers lack sufficient knowledge about …

Leveraging Leadership To Retain Early Career Teachers In Stafford County Public Schools, Christopher Gannon, Caroline Canning, Andrew Hoyt, Lauren Johnson, Thomas Mcauley

Doctor of Education Capstones

Stafford County Public Schools requested an evaluation of their current support of Early Career Teachers (ECTs) with one to three years experience, and its potential impact on retention efforts. They stamped this request with urgency, noting the COVID-19 pandemic and teacher pay as two driving factors, specifically, impacting retention of teachers within their first three years. Our Capstone team sought a deeper understanding of the following issues in three research questions: 1) types of support across their division and within their school buildings, 2) the impact of current practices of support, and 3) division-wide considerations for enhancing current systems of …

Riverview Community Park Commoning Plan, Haley B. Keene

Master of Urban and Regional Planning Capstone Projects

Riverview Community Park began as an illegal DIY skatepark in the Maymont neighborhood of Richmond, Virginia. Now, although it is a city park, it is still entirely managed by volunteer community groups (skateboarders, the neighborhood Civic League, and a community garden) who view the park as a creative, experimental community-led spatial project. Due to a dearth of communication between the three groups, the park has suffered political strife between the groups and a chaotic physical atmosphere. This plan utilizes a commons governance framework and participatory, asset-based community design to usher in a new era of enhanced collaboration, common narratives, and …

Richmond Watts For Families: An Action Plan To Bring Multifamily Community Solar To The City Of Richmond, Daniel P. Rafferty

Master of Urban and Regional Planning Capstone Projects

Seeking to advance community solar energy for multifamily residents within the City of Richmond, Virginia, the Richmond Watts for Families (WFF) is a plan to guide the city in developing robust multifamily community solar program(s). Community (shared) solar has emerged as an alternative approach to traditional rooftop solar energy by allowing customers to subscribe to a portion of a solar array that is shared among other subscribers, which has the opportunity to increase participation by marginalized communities and those currently without the financial or physical means to install solar This plan aids the city in implementing its recently adopted climate …

Revitalize Wakefield: Charting A Course For Growth, Bannon T. Luckert

Master of Urban and Regional Planning Capstone Projects

This plan focuses on discovering the objectives and aspirations of residents and merchants to formulate a revitalization strategy comprising actionable steps that will contribute to the flourishing of a rural downtown. By leveraging Wakefield's rich history and existing assets, this plan aims to help realize the vision of revitalizing Wakefield.

The Green Infrastructure Network: Mapping Hopewell's Social & Natural Assets, Derek J. Cathcart

Master of Urban and Regional Planning Capstone Projects

This capstone plan provides a map of the network of physical green infrastructure (GI) and the actors involved in GI projects in Hopewell. Green Infrastructure is mapped spatially with GIS and distinguishes between the various forms of GI present in the city. A network map visualizes the relationships between actors and their relationships with GI in Hopewell. This plan analyzes Hopewell’s GI network of social-ecological assets and their relative interactions. While the capstone plan is not a resilience plan on its own, it fosters resilience in Hopewell by connecting actors like city departments, state agencies, residents, business owners, and local …

Assessing The Impact Of Permanent Supportive Housing On Property Values In Richmond, Virginia, Elaine Negasi

Master of Urban and Regional Planning Capstone Projects

The combination of affordable housing and supportive services in permanent supportive housing is a proven housing intervention effective in providing housing stability for people who have long been homeless, unstable, or socially marginalized. Virginia Supportive Housing provides crucial resources in addressing the root causes of homelessness in the region.

In many cases, opposition to permanent supportive housing is based on concerns that property values will decline. As a response to these concerns, this study will provide insight into the extent to which property values are affected. This study aims to change the perception of permanent supportive housing to foster community …

Msw Portfolio, Rachel Elizabeth Andrade

Graduate Student Portfolios, Professional Papers, and Capstone Projects

My MSW portfolio consists of my detailed journey throughout the coursework through U of M and practicum experiences.

Opioid System's Potential Involvement In Ketamine's Cognitive And Antidepressant-Like Effects In Rats, Fan Zhang

Theses and Dissertations

Depression stands as one of the most pervasive mental health challenges worldwide, including the United States. Conventional antidepressants typically display a delayed onset of therapeutic action (4-8 weeks) and lack efficacy in a substantial portion of patients (over 40% of depressed patients are treatment-resistant). The dissociative anesthetic ketamine, which is a glutamatergic N-methyl-D-aspartate (NMDA) antagonist, has emerged as a promising novel treatment due to its rapid and prolonged antidepressant effects, and it is especially beneficial for treatment-resistant depression. Nevertheless, the precise neurochemical mechanisms underlying ketamine’s antidepressant properties remain elusive, hampering the development of safer and more efficacious treatments. The present …

The Relationship Between Material Circumstances And Primary Care Utilization After Enrollment In Virginia’S Medicaid Expansion, Hannah Shadowen

Theses and Dissertations

Health and health equity encompass not only healthcare but individual level material circumstances like food and housing, neighborhood level conditions like local consequences of residential segregation, and state and federal policies like Medicaid expansion. However, we are just beginning to understand how state level health insurance policy changes operate in the relationship between material circumstances, healthcare use, and health outcomes. This work focuses on newly enrolled Virginia Medicaid expansion members by using both claims data and survey data collected at the point individuals enrolled in Medicaid expansion and a year after Medicaid coverage.

Paper 1 asks if newly enrolled Medicaid …

Military Faculty Experience Within A Faculty Learning Community And Its Interest In Learning Technology Integration, Jonathan David Zemmer

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This study explored the experiences and perceptions of faculty members at an institution of military education participating in a Faculty Learning Community (FLC) focused on educational technology utilization during the 2022-2023 academic year. As the Department of Defense (DoD) emphasizes the importance of technology capabilities and workforce development, understanding faculty experiences in these settings becomes crucial for effective technology integration in teaching and learning. Utilizing a participatory action research (PAR) design, the study collected data through faculty artifacts, researcher reflexive journals, semi-structured interviews, bi-monthly meeting minutes, videos, and presentation materials. The research questions focused on the change of participants' understanding …

Examining The Effects Of Parameter Correlation And Its Implications For Models Of Learning And Retention: A Large Scale Model Validation : Examining The Effects Of Parameter Correlation And Its Implications For Models Of Learning Andretention: A Large Scale Model Validation, Michael Gordon Collins

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Mathematical models of learning and retention have long been developed in psychology for both basic and applied research. For basic research, models of learning and retention attempt to explain how individuals acquire and retain information over time. While for applied research, models of learning and retention are used to inform education and training decisions. In both of these applications, the primary purpose of using a model is to fit and predict the performance of individuals. However, little attention has been paid to the interpretation of a model’s free parameters (i.e., learning and decay rates) and the effect that a model’s …

The Effects Of Actions And Characteristics In The Perception Of Aggressive Intentions : The Case Of Russia Border States After The 2022 Invasion Of Ukraine, Noah Duteil

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How alliance structures form and why states balance, bandwagon, or remain neutral against other states is an enduring and important question in international relations. This thesis adds to the discussion of how states make alliance decisions by testing whether perceptions matter in predicting state balancing behavior and by proposing a new theoretical framework which allows for a better understanding of the mechanisms which drive the perception of aggressive intentions as a factor within Stephen Walt’s balance of threat theory. In this thesis, I explore the construction of threat through a comparative case study analysis of border states of Russia following …

Investigation Of Spalart-Allmaras Turbulence Model For Vortex Flows, Abigail Rayna Kerestes

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Conventional turbulence models often predict behaviors opposite as to what is observed in flows subject to rotation. In this type of flow scenario, rotation typically induces turbulence suppression. To address this limitation, a modification to the Spalart Allmaras Model with Rotation Correction (SA-R) was proposed to enhance the original Spalart Allmaras Model’s sensitivity to rotation and curvature. To test the validity and accuracy of this modification, two cases were investigated. The first case involved an axisymmetric rotating pipe. A Reynolds Number of 37,000 was implemented and the initial and boundary conditions established by Zaets et. al. were utilized. Initially non-rotating, …

Understanding Impact Of Graph Structure On Knowledge Graph Embedding, Brandon Dave

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The effectiveness of a deployed knowledge graph is commonly evaluated with defined use-cases from domain experts. This poses challenges during the development cycle in determining how to represent data. Developers of a knowledge graph can optionally include semantics into a knowledge graph by abstracting the data representation in such a way that mirrors information as it exists in the real world. Consequently, the abstraction is represented by additional layers, resulting in performant differences in knowledge graph embedding; such as, the embedded model's ability to infer facts between entities through link predictions. This thesis presents a comprehensive analysis of the performance …

The Organophosphate Malathion Underlies Locomotor Performance Changes And Motoneuron Morphological Alterations In Sprague Dawley Rats, Kaitlyn Marie Miller

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Organophosphates are known neurotoxicants; however, they remain in use as flame retardants and are heavily used as pesticides. Malathion is an organophosphate insecticide commonly used in the United States since 1956. Despite known neurobehavioral impacts, there is little data available as to how repeated, occupational like, malathion exposures impact locomotion and the structure of motoneurons. We hypothesized that low-level repeated exposure to malathion would result in motor function deficits with anatomical alterations in the alpha-motoneurons (MN) consistent with neurodegeneration. Also, we hypothesized that galantamine would be neuroprotective against the effects of malathion. To test our hypothesis, we exposed male and …

Seismic Refraction Mapping Of The Pre-Glacial Teays River Valley In West Central Ohio Using A Seismic Reflection Dataset, Matthew L. Klempp Ii

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The Teays River Valley is an ancient river valley system that existed before the Pleistocene Ice Age and spanned present-day Illinois, Indiana, Ohio, West Virginia, and Virginia. During the Pleistocene Ice Age, the Teays River Valley was buried by advancing continental glaciers and meltwater throughout most of its length. Due to the Teays’ average width of roughly 2 miles and burial depth of approximately 200 meters (656 feet), the Ohio Geological Survey has been pursuing geophysical methods to map the location and depth of the Teays River Valley in Ohio. The present study is a refraction analysis using the first …

Ai-Enabled Hardware Security Approach For Aging Classification And Manufacturer Identification Of Sram Pufs, Harshdeep Singh

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Semiconductor microelectronics integrated circuits (ICs) are increasingly integrated into modern life-critical applications, from intelligent infrastructure and consumer electronics to the Internet of Things (IoT) and advanced military and medical systems. Unfortunately, these applications are vulnerable to new hardware security attacks, including microelectronics counterfeits and hardware modification attacks. Physical Unclonable Functions (PUFs) are state-of-the-art hardware security solutions that utilize process variations of integrated circuits for device authentication, secret key generation, and microelectronics counterfeit detection. The negative impact of aging on Static Random Access Memory Physical Unclonable Functions (SRAM PUFs) has significant consequences for microelectronics authentication, security, and reliability. This research thoroughly …

Ml-Assisted Side Channel Security Approaches For Hardware Trojan Detection And Puf Modeling Attacks, Niraj Prasad Bhatta

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Hardware components are becoming prone to threats with increasing technological advances. Malicious modifications to such components are increasing and are known as hardware Trojans. Traditional approaches rely on functional assessments and are not sufficient to detect such malicious actions of Trojans. Machine learning (ML) assisted techniques play a vital role in the overall detection and improvement of Trojan. Our novel approach using various ML models brings an improvement in hardware Trojan identification with power signal side channel analysis. This study brings a paradigm shift in the improvement of Trojan detection in integrated circuits (ICs). In addition to this, our further …

Characterization Of Cisplatin-Dna Adduct Release From Cancerous And Non-Cancerous Cell Lines, Aleena Alex

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Cisplatin is an effective chemotherapeutic agent that is used to treat lung, breast, esophageal, ovarian, and pancreatic cancers. Despite being effective in treating a wide variety of cancer types, its cytotoxicity to off-target healthy tissues restricts its therapeutic application. The platinum atom of cisplatin interacts with DNA and results in the formation of inter-and intra-strand crosslinks, which are often referred to as DNA adducts. These adducts are mutagenic and potentially lethal to cells. The sole pathway for cells to excise intra-strand cisplatin-DNA adducts from the genome is through nucleotide excision repair. The fate of unrepaired DNA adducts is not understood …

Rf Steganography To Send High Security Messages Through Sdrs, Megan K. Patrick

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This research illustrates a high-security wireless communication method using a joint radar/communication waveform, addressing the vulnerability of traditional low probability of detection (LPD) waveforms to hostile receiver detection via cyclostationary processing (CSP). To mitigate this risk, RF steganography is used, concealing communication signals within linear frequency modulation (LFM) radar signals. The method integrates reduced phase-shift keying (RPSK) modulation and variable symbol duration, ensuring secure transmission while evading detection. Implementation is validated through software-defined radios (SDRs), demonstrating effectiveness in covert communication scenarios. Results include analysis of message reception and cyclostationary features, highlighting the method's ability to conceal messages from hostile receivers. …

The Role Of Suc22-S239f Mutation In Sensitizing Fission Yeast To The Replication Stress Induced By Hydroxyurea, Kajal Davi

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Genetic mutations can significantly impact the cell’s susceptibility to environmental stress. The fission yeast Schizosaccharomyces pombe is an established eukaryotic model for studying the cellular responses to various environmental stresses. This work investigated a missense mutation (S239F) identified in Suc22, the small subunit of the ribonucleotide reductase (RNR). RNR is an essential enzyme for the biosynthesis of dNTPs required for DNA replication and repair. We found that the suc22-S239F mutation increases the susceptibility to the replication stress induced by hydroxyurea (HU), not the DNA-damaging agents such as UV, methyl methanesulfate, and CPT. HU is a drug commonly used in laboratories …

Investigating Calcium Levels During Excitation-Contraction Coupling In Model Huntington's Disease Skeletal Muscle, Pooneh Hajmirza Mohammadi Kamalabadi

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One of the less studied aspects of Huntington’s disease (HD) is its impact on skeletal muscle function. Recent studies have suggested that HD patients exhibit altered muscle function and reduced muscle strength, which may be related to defects in Ca2+ handling during excitation-contraction coupling (ECC). However, the underlying mechanisms of these alterations remain poorly understood. This study aims to determine if the myoplasmic Ca2+ during ECC is reduced in late-stage R6/2 (mouse model of HD) muscle fibers compared to age-matched controls during twitch or tetanic stimulation. Such a decrease would help explain weakness or fatigue in the model HD muscle. …

Experimental Validation Of Two Highly Loaded Low Pressure Turbine Blades At High Speed Low Reynolds Number Conditions, Ryan Sauder

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In the constant search for more efficient engines, one approach to gain performance is to reduce the weight of the low pressure turbine (LPT) module. This module can account for up to 30% of the total engine weight [1], and a reduction in LPT weight results in clear gains to engine performance and a reduction in engine cost. High lift airfoils accomplish this weight reduction by each blade extracting a larger amount of work from the flow and thus requiring fewer blades to drive the compressor when compared to conventional blades. However, high lift LPT blades, quantified by a high …

Effects Of Geometric Isomerism On Benzothiazole-Carbazole Based Tadf Emitters In Poly(Arylene Ether)S, Grace Olive

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Thermally activated delayed fluorescence (TADF) small molecules have dominated the literature for their use in OLED devices. The use of TADF polymers has been employed to correct for processing issues that small molecules face, providing increased thermal stability and supportive electronic structures. A TADF chromophore based on a 2-(2,6-difluorophenyl)-benzothiazole-carbazole donor-acceptor pair was synthesized via a copper (I) catalyzed reaction. The chromophore exhibited peak absorption at 340 nm and emission at 477 nm. The resulting chromophore was incorporated into a poly(arylene ether) (PAE) backbone via nucleophilic aromatic substitution (NAS) with 4,4’-biphenol, 4,4’-difluorodiphenyl sulfone, and 2-(2,6-difluorophenyl)-benzothiazole as comonomers. UV/Vis analysis of the …

Role Of Interleukin 2 Receptor Alpha In The Cellular Response To Dna Damage, Shristi Khanal

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The interleukin 2 receptor alpha (IL-2Rα), which is integral to the functioning of the cytokine interleukin 2, has recently been found to be present in different cell types besides just lymphocytes. Previous studies done by our laboratory showed that several other non-lymphoid cells including smooth muscle cells express IL-2Rα. Vascular smooth muscle cell (VSMC) deficient in IL-2Rα exhibited increased proliferation, decreased size, and hypodiploid DNA content when compared to wild type (WT) cells. Previous studies also suggested that VSMC proliferate in response to IL-2 and that IL-2 increases following interventions to stimulate intimal hyperplasia in vivo. These findings, in total, …