Digital Commons Network^™

Measurement Of Kerr Rotation Using A Variable-Angle Polarizer Method, Shusmita Podder Pooza

Theses

The magneto-optical Kerr effect (MOKE) occurs when polarized light is reflected from a magnetized surface, causing changes in polarization angle (called Kerr rotation) and its state (linear vs elliptical, for example). In a simple version, MOKE measurement involves measuring the intensity of the reflected beam off the surface of a sample as an external magnetic field is swept through it. We record a change in the reflected intensity when the magnetization of the material changes. While easily measurable using modern electronics methods, the Kerr rotation is minimal, only of the order of milliradians (~0.1 deg), and is a characteristic of …

Power Signature-Based Hardware Security Techniques For The Internet Of Things, Ashish Mahanta

Dissertations

The rapid proliferation of the Internet of Things (IoT) has introduced significant security challenges, particularly concerning stealthy, instruction-level malicious code injections that evade traditional software defenses. While conventional power analysis techniques are highly effective at detecting such subtle abnormalities, they require capturing high-resolution, voluminous power trace data. This dependency necessitates bulky data acquisition (DAQ) instrumentation, power-hungry analog-to-digital converters (ADCs), and intensive computational resources, making these methods impractical for deployment on resource-constrained IoT devices. To bridge this critical gap, this dissertation presents a novel hardware security paradigm, the Power Rising and Descending Signature (PRIDES) methodology. Instead of quantizing actual power consumption …

From Understanding To Production: A Qualitative Case Study Of Instructional Alignment And Bar Examination Readiness At One Law School, Mackenzie E. Gray

Education (PhD) Dissertations

Many law students who understand the law struggle to produce it under examination conditions.This qualitative case study examined how instruction in three settings at one ABA-accredited law school (first-year doctrinal, upper-division doctrinal, and for-credit bar preparation courses) shaped students’ perceptions of their readiness for the California Bar Examination. Grounded in metacognitive transfer theory, the study drew on 18 classroom observations across six courses, semi-structured interviews with seven students and four professors, and a simulated bar examination scored against a criterion-referenced rubric, all collected during the Spring 2026 semester. Interview data were analyzed through codebook thematic analysis. Five themes resulted. Students …

Agent-Based Modeling Of Cellular Dynamics In Adoptive Cell Therapies, Yujia Wang

Dissertations and Theses (Open Access)

Adoptive cell therapies (ACT) have shown promising progress in combating cancer, but clinical responses remain heterogeneous. Key determinants, including the functional states of infused cells, tumor–immune interactions, and dosing strategies, are difficult to resolve experimentally in the dynamic and heterogeneous tumor microenvironment, limiting optimization of ACT products and treatment regimens. To address the gap, we developed ABMACT (Agent-Based Model for Adoptive Cell Therapies), a computational framework that reconstruct key cellular functions, interactions, and molecular signatures to recapitulate cell population dynamics associated with differential treatment responses. ABMACT encodes autonomous “virtual cells” using literature-informed rules calibrated with experimental data, enabling simulation of …

Transcriptional Regulation In The Uterine Luminal Epithelium, Evelyn A. Carrion

Dissertations and Theses (Open Access)

Transcriptional Regulation in the Uterine Luminal Epithelium

Evelyn A. Carrion

Advisor: Richard R. Behringer, PhD

Abstract

The uterus is an organ comprised of multiple tissues that are essential for women’s health and reproduction. The uterus is composed of multiple tissue layers, including the perimetrium, myometrium, and the endometrium. The endometrium is the inner lining of the uterus, and contains the luminal epithelium, glandular epithelium, and stroma. The luminal epithelium is a simple columnar layer of cells that is necessary for embryo implantation. The uterus is derived in part from the embryonic precursor tissue called the Müllerian duct. There are no …

Ai-Driven Segmentation And Volumetric Response Modeling Of Liver Regions To Radiotherapy, Aashish Chandra Gupta

Dissertations and Theses (Open Access)

In liver-directed radiotherapy (RT), liver regions receiving higher doses typically undergo atrophy while contralateral/adjacent lower-dose regions may exhibit compensatory hypertrophy through regeneration of healthy tissue. Optimizing the RT plan to promote regional hypertrophy while minimizing the risk of developing atrophy has the potential to enhance post-RT liver function and long-term survivorship. However, current clinical practice largely relies on global liver dose-volume metrics during RT-planning, which may obscure favorable dose-response correlation and limit actionable guidance for clinicians. Therefore, we hypothesized that post-RT regional liver response is governed by a combination of region-specific dose-volume and patient clinical features, and that these responses …

Defining The Role Of Spxa1 And Spxa2 In Group A Streptococcus (Gas), Gretchen Anne Morrison

Dissertations and Theses (Open Access)

Group A Streptococcus (GAS) is a human-restricted pathogen whose global incidence has surged in the post-COVID era. The ability of GAS to shift from a colonizing to invasive phenotype depends on coordinated virulence gene regulation in response to host-imposed stressors. The paralogous global transcriptional regulators, SpxA1 and SpxA2, have emerged as central mediators of these adaptive responses; however, the mechanisms by which these regulators influence both global gene regulation in direct response to external stresses and the host response as a result of regulatory changes remain incompletely understood. Using an integrated multi-omic approach, we define the distinct yet interconnected regulatory …

Regulation Of Müllerian Duct Mesenchyme Transcription During Mammalian Sex Differentiation, Haowen Li, Richard R Behringer, Rachel D Mullen

Dissertations and Theses (Open Access)

Sp7/Osterix (Osx) encodes a zinc-finger transcription factor of the Specificity-protein family discovered by Nakashima et al. at the MD Anderson Cancer Center. While primarily recognized for its role in osteogenesis, Osx has also been implicated in mammalian reproductive development, particularly in male sex differentiation, where Müllerian Duct (MD) regression occurs, mediated by anti-Müllerian hormone (AMH) signaling. AMH-induced regression signals are transduced by the mesenchymal tissue surrounding the ductal structure, known as the Müllerian Duct mesenchyme (MDM). It was discovered that AMH signaling is necessary and sufficient for driving Osx expression in MDM. A previous transgenic mouse reporter …

Oxidative Stress Mediated Glutamate Release And Nmda Receptor-Dependent Synaptic Remodeling In Radiation-Induced Cognitive Dysfunction, Thanh Lam

Dissertations and Theses (Open Access)

In children younger than 14 years old, the brain and other parts of the central nervous system are the most common sites for solid tumors. Radiotherapy is an effective treatment for central nervous system (CNS) tumors. However, it often causes a progressive decline in cognitive functions, which is especially devastating for pediatric patients. Although post-mitotic neurons are generally considered resistant to radiation-induced immediate cell death, ionizing radiation causes complex neurochemical and structural changes that damage synaptic integrity. In this study, we examined the molecular cascades following a 10 Gy radiation dose applied to mouse cortical neurons. We found that radiation-induced …

Mutational Analysis Of Domain Functions In The Yeast Decapping Enzyme Dcp2, Jellisa Ewan, Ambro Van Hoof

Dissertations and Theses (Open Access)

In yeast, the major mRNA decay pathway involves deadenylation of the 3’ poly-A tail, followed by decapping of the 5’ m7Gppp cap and subsequent 5’ to 3’ degradation or 3’ to 5’ degradation. This is carried out by Pan2/Pan3 and Ccr4/Not deadenylases, the decapping enzyme Dcp2, and Xrn1 and  RNA exosome exoribonucleases, respectively. The eukaryotic mRNA decapping enzyme complex, Dcp1/Dcp2, is essential in yeast, and deletion of either gene is lethal. However, the deadenylases that act upstream and the 5’ exoribonuclease that act downstream of the decapping step are not, even though they are all highly conserved with no known …

From Geometry To Recognition: A Quantitative Framework For Tcr-Pmhc Structural Analysis In The Age Of Predicted Structures, Kun Hee Kim

Dissertations and Theses (Open Access)

Recognition of antigen by a T cell begins with a single physical event, the engagement of the T cell receptor (TCR) with a peptide-major histocompatibility complex (pMHC), and this interaction is encoded in the geometry with which the receptor docks onto the composite pMHC surface. Whether that docking geometry is biologically organized, and whether the structures now produced at scale by prediction preserve recognition or only reproduce that organization, are the two questions this thesis addresses. Two gaps stand in the way. The first is a gap of measurement, because docking geometry has never been made quantitatively comparable across many …

Antigen Discovery In Multiple Myeloma Using Integrated Long-Read Transcriptomics And Immunopeptidomics, Aya Albittar

Dissertations and Theses (Open Access)

Multiple myeloma (MM) remains an incurable plasma cell malignancy, with relapse driven by persistent chemotherapy-resistant cells and residual disease following treatment. Although immunotherapies have transformed MM care, their success depends on identifying tumor-specific antigens that can be safely targeted. While aberrant genomic structural variation and transcriptional dysregulation are increasingly recognized as sources of novel antigens in MM, the HLA-presented antigenic landscape of MM remains incompletely characterized, particularly for non-canonical, structurally-derived peptides, and long-read transcriptome-informed immunopeptidomic data specific to MM remain scarce.

We established an integrated antigen discovery platform combining long-read RNA sequencing (Iso-Seq) with mass spectrometry-based HLA immunoprecipitation and immunopeptidomics …

Low-Cost Modular Transradial Prosthetic System, Caleb E. Barajas

Master's Theses

Upper-limb loss can significantly impact overall quality of life by limiting  a person's ability to perform activities of daily living (ADLs). Although prosthetic devices can help bridge the gap, many upper-limb prostheses are limited by high costs, discomfort, limited repairability, and accessibility barriers. Current commercial myoelectric prosthetic hands can provide high levels of functionality, but are often expensive and require specialized clinical access. In contrast, many current low-cost and open source prosthetic devices improve affordability but are limited in function or designed for partial hand applications rather than full transradial limb loss.

The purpose of this thesis was to design, …

Development And Initial Testing Of Novel Microfabricated Soap Film Frames For Use In Studying Instability Mechanisms In Liquid Sheet Edges, Sam Hastings, Sam Hastings

Master's Theses

The breakup of retracting liquid sheet edges into droplets is governed by instability mechanisms that, in some ways, are not yet fully understood. Previous and limited experimental soap film retraction experiments using straight edges have produced results that differ from the behavior predicted by Rayleigh-Plateau and Rayleigh-Taylor instability models, suggesting that uncontrolled imperfections in traditional wire frames (used to form and detach the soap films) may influence film detachment and the subsequent edge instability observed. This thesis presents the development of a new experimental approach using microfabricated silicon wafer-based soap film frames to provide improved control over the initial conditions …

A Critical-Constructivist Grounded Theory Exploration Of The Mental Health Experiences Of Individuals With Intellectual Disabilities In Post-Secondary Settings, Alyssa L. Decker

Dissertations, 2020-current

Individuals with intellectual disabilities (ID) now have access to higher education, often through inclusive post-secondary education programs (IPSE), to increase employability and quality of life. IPSE programs, historically, have provided academic and life skill support and not mental health support within programs’ curricula. A recent review of IPSE programs reveals that if mental health services are included, they are often accessed through university health services. Transitioning from high school to college induces high levels of stress, which can exacerbate underlying mental health conditions. Mental health care is defaulted to an already overburdened college counseling center without the knowledge and skills …

The Female Gothic And Marianne Dashwood: The Gothic Heroine Of Sense And Sensibility, Samantha Cottle

English (MA) Theses

In the late eighteenth-century, the rise of the English Gothic novel propelled an extension referred to as the Female Gothic. Through the complexity of the English Gothic genre, writers—particularly women writers—explore the intersectionality of gender, class, natural horrors, and race, creating a space where the heroines of these Gothic novels exist beyond the confinement of the domestic sphere. The Female Gothic was a way for these women writers to acknowledge the natural horrors that plagued the experiences of being a woman—it addressed the oppression of a patriarchal society in which the subversion of the female body was perceived as an …

Effects Of Peer-Mediated Constant Time Delay Instruction On Science Vocabulary Acquisition For Students With Moderate Intellectual Disabilities, Amy S. Roberts

Electronic Theses and Dissertations

This study examined the effectiveness of combining peer-mediated embedded instruction with constant time-delay (CTD) procedures to improve Agriscience vocabulary learning among secondary students with moderate intellectual disability who were educated in an inclusive Agriscience classroom. A multiple-probe across participants design was conducted with three students with moderate intellectual disability. Trained peer tutors provided embedded vocabulary instruction during naturally occurring classroom activities. Results showed an increase in independent correct responding for all participants following the implementation of the intervention. Procedural fidelity, interobserver agreement, Tau-U effect size, and social validity data further demonstrated that the intervention was implemented consistently and was viewed …

Maintaining Empire, Maiya White

War, Diplomacy, and Society (MA) Theses

This thesis portfolio examines the structure and consequences of imperialism, exploring the relationship between empires and their subjects using the cases of the United States of America and Japan. While existing research on empire focuses on territorial expansion, this study proposes a working definition of empire that centers on coercion and manipulation of the domestic population to demonstrate how empires sustain themselves. Additionally, this thesis portfolio demonstrates how governments maintain control by influencing how their citizens should interpret their actions.  Utilizing primary sources, including legal and legislative documents, government reports, diplomatic correspondence, and visual propaganda, this thesis portfolio argues that …

Jison Jiei: Offensive Realism And Imperial Japan's Spiral Toward Regional Hegemony, John William Dodd

War, Diplomacy, and Society (MA) Theses

This thesis examines Imperial Japan’s march from the Mukden Incident of 1931 to the attack on Pearl Harbor in 1941 through the lens of offensive realism. It asks to what extent Japan’s prewar grand strategy can be understood as a bid for regional hegemony, and what that interpretation reveals about the relationship between power politics, international law, and future great-power crises. Rather than treating Japanese expansion as irrational madness or reducing it only to ideology or militarism, this thesis argues that Japanese leaders acted according to a recognizable strategic logic.

Proceeding from theory to historical analysis, this project first situates …

The Augmented Matching Law, Matias A. Avellaneda

All Graduate Theses and Dissertations, Fall 2023 to Present

Every living organism, including humans, has a finite amount of time available: 24 hours in a day, 365 days in a year, and a certain number of years in its life. At every moment, such an organism will be engaging in one of a multitude of possible activities, such as eating, sleeping, or reading this dissertation. We use the term choice to denote the way in which the organism distributes its time among all these activities, and some of these choice patterns are more beneficial to the organism than others, showcasing the importance of understanding the mechanisms underlying choice. A …

Religious Practice And Attitudes Toward Immigration And Racial Justice In America, Amya Douglas

Graduate Theses and Dissertations (2019 - present)

This study aims to understand how Christians’ knowledge of Scripture and involvement in the church have an impact on their social-political views, specifically, racial justice and immigration. By using the survey responses from the 6th wave of the Baylor Religion Survey, more frequent church attendance and reading Scripture were correlated with a greater recognition of racism in terms of being against white supremacy and white nationalism, supporting racial justice when asked about racial gaps, and possessing greater support for immigrants. This study highlights the distinction between religious affiliation and religious practice, and it suggests that certain policy sentiments can be …

A Machine Learning And Artificial Intelligence Sentiment Analysis Of Esg Disclosures, John Barnett Davis

Graduate Theses and Dissertations (2019 - present)

This dissertation examines whether environmental, social, and governance (ESG) disclosure sentiment extracted from SEC Form 10-K Item 1A risk disclosures aligns with Bloomberg ESG scores. The study combines SEC textual disclosures, Bloomberg ESG ratings, firm financial data, executive compensation data, and executive gender characteristics. Natural language processing and artificial intelligence methods, including FinBERT, Loughran-McDonald sentiment measures, BART-MNLI zero-shot classification, LLaMA-based ESG scoring, and readability analysis, are used to evaluate ESG-related disclosure signals. Results reveal that SEC 10-K Item 1A risk-factor sentiment and Bloomberg ESG scores represent related but distinct constructs. ESG sentiment in Item 1A is poorly aligned with third-party …

Evaluation Of Dredged Sediments As A Partial Replacement For Fine Aggregate In Mortar And Concrete, Ashish Gautam

Graduate Theses and Dissertations (2019 - present)

The feasibility of using dredged sediment from the Mobile River as a partial replacement for fine aggregate in mortar and concrete was investigated through a series of laboratory characterization and performance evaluation. Three dredged sediment samples (A, B and C) were initially examined, and Sample A was selected for further evaluation due to its closer resemblance to natural fine aggregate. This sample exhibited lower moisture content, higher sand equivalent values, higher specific gravity, and lower absorption. Mortar mixtures with 0, 10, 20, 30, 50, 75 and 100% dredged sediment replacement showed decreasing workability as the replacement level increased. The 20% …

Lessons From The Club Homeschool Capstone: Testing, Data Discipline, And The Computer Science Curriculum, Shane Brown

University Honors Theses

This thesis looks at the CLUB Homeschool Capstone project to argue that Portland State University's Computer Science curriculum should introduce testing and data quality discipline earlier and more intentionally than it does now. As team lead of a seven-person team, I coordinated sprint planning, communicated with the sponsor, and developed custom Discourse plugins that enhanced an existing forum platform instead of creating a separate application database, as requested by the sponsor. The project's requirements document called for a formal testing plan, but our team lacked the practical experience to implement one. This gap became evident through my internships as a …

Oak Savanna Expansion: Indigenizing Psu's Urban Landscape, Ash Herb

University Honors Theses

Since time immemorial Indigenous Peoples have resided in what is now named Portland of the Pacific Northwest in the Willamette Valley. For hundreds of years, this forested Land has been colonized, razed to stumps and covered in cement in order to build the urban landscape. Due to such destruction on a broad scale, we are experiencing the results of climate catastrophe. By finding ways to reclaim our relationship with Land and returning to Indigenous epistemologies, our urban landscape has the opportunity to shift towards restoration and prosperity. Indigenous plants have existed here, supporting humans in a reciprocal relationship, for thousands …

A Quantitative Analysis Of Sea Turtle (Chelonia Mydas, Caretta Caretta, And Lepidochelys Kempii) Suture Morphology, Adolfo Emanuel Artigas Iv

Harriet L Wilkes Honors College Theses

Sea turtle shells are formed of modified ribs, which, structurally, are sandwich composites. Sandwich structures provide both physical protection and pressure response associated with diving at depth. Carapacial sutures, tight joints between adjacent bones, connect modified ribs with collagenous fibers. Previous research on freshwater turtle shells suggests that sinuous sutures (highly convoluted) enhance compression strength. Limited research explored the form and functional significance of sutures in marine turtles. To investigate suture morphology and potential ontogenetic effects, I analyzed sutures in green (Chelonia mydas), Kemp’s ridley (Lepidochelys kempii), and loggerhead (Caretta caretta) sea turtles. Samples …

Emergency Medical Services Mental Health: Causes Of Providers Leaving The Industry, Brian C. Selke

Graduate Theses and Dissertations (2019 - present)

Employee resilience and mental health have become critical concerns in Emergency Medical Services (EMS) as workforce shortages increasingly threaten staffing stability and patient care. National Registry of Emergency Medical Technicians (NREMT) data indicates that more than 30% of eligible EMS providers did not recertify between 2020 and 2023, raising concerns about workforce sustainability. This study examines EMS providers’ intentions to leave the profession and identifies workplace factors associated with turnover. A statewide survey of more than 1,200 licensed EMS providers in Alabama was analyzed using regression techniques to evaluate the relationship between workplace conditions and turnover intentions. Results demonstrate that …

Vulnerability In The Dark Triad: Insecure Attachment And Relational Aggression In The Peer Relationships Of College Students, Summer Boggs

Dissertations

Research on relational aggression (i.e., a type of aggression in which the aggressor harms others by damaging their relationships, reputation, and/or feelings of social acceptance) with college students has identified several important correlates, including anxious and avoidant attachment styles. Moreover, the personality traits captured by the Vulnerable Dark Triad (VDT; i.e., borderline, the antisocial component of psychopathy, and vulnerable narcissism; Miller et al., 2010) have demonstrated positive relationships with both relational aggression and insecure attachment. This study examined the relationship between insecure attachment and relational aggression among college students (N = 560), testing VDT traits as partial mediators of …

Modeling Mean And Variability Of Anxiety In Ecological Momentary Assessment Data Using Mixed-Effects Location–Scale Models, Trenzy Odero

Electronic Theses and Dissertations

Ecological Momentary Assessment is a method of collecting repeated measures of people in real time within natural environments. This results in hierarchical data that has a significant amount of variation at the person level. The traditional linear mixedeffects models assume that the residual variance is constant, which might not be true when the residual variance varies among individuals as well as in time. This thesis uses mixed-effects location-scale (MELS) models to model the mean and variance of an EMA outcome together. By introducing the possibility of variability in residual variance within and across individuals and with covariates, the MELS framework …

Testing P300-Based Biometric Authentication Paradigms, Jordan Razzak

Electronic Theses and Dissertations

Bench research suggests that P300 amplitude is greater in response to self-relevant stimuli compared to familiar stimuli. This effect could enable a novel method of biometric authentication based on the self-relevant P300. This dissertation aims to: (1) determine the optimal presentation paradigm for leveraging self-relevance in P300-based biometric authentication, and (2) investigate P300 responses from self-relevant stimuli versus stimuli learned over the course of a week.

Two presentation paradigms were compared – rapid serial visual presentation (RSVP) and matrix presentation (MP). Participant-specific RSVP and MP classifiers were trained by applying stepwise linear discriminant analysis to data collected during presentations of …