Digital Commons Network^™

Consequences Of Spatial Heterogeneity For Turbulent Wake Development, Ryan Scott

Dissertations and Theses

Spatial heterogeneity is an fundamental property of natural systems. In fluid dynamics subtle variations in fluid motion give rise to chaotic turbulent flows. When a fluid passes an object it retains an imprint of the object as a momentum deficit known as a wake. The resulting spatial structure of the wake is intrinsically linked to the object responsible for its creation. The coupling between geometric complexity in wake producing entities and turbulent wake evolution is considered in terms of spatial heterogeneity from individual wakes through turbulent canopy flows. First a novel Lacunarity-based method is developed for quantifying spatial heterogeneity in …

The Central Role Of Perceived Safety In Connecting Crash Risk Factors And Walking Behavior, Kyu Ri Kim

Dissertations and Theses

Despite advanced policies, plans, and facilities, many pedestrians are still injured and killed in traffic crashes in the United States. To improve pedestrian safety and the walking environment, the relationship between surrounding crash risk factors and perceived safety that influence people's behavior needs to be studied. This study aims to examine pedestrian crash risk factors, the relationship between crash risk factors and perceived safety, measured as threatened experiences and safety attitudes, and the relationship between safety attitudes and walking behavior.

The analysis used data from three primary sources: (1) an original survey of 551 residents in 10 neighborhoods in Oregon …

Towards A New Discourse On Success In Alternative Education, Samuel Thomas Settelmeyer

Dissertations and Theses

Although researchers agree that Alternative Education (AE) within the United States is an essential set of schools and programs that do things beyond traditional education, they do not agree on the purpose for these efforts. To understand how researchers can connect between existing perspectives and consider new ways that they can discuss success in the future, I interviewed 16 students and 15 staff from three different AE schools within the same state. Through thematic analysis, I found students and staff to describe success as an amalgamation of individual and common conceptions, requiring individual effort and support, a commitment to daily …

Efficient And Chemoselective Access To Highly Functionalized Arenes By C-H Deprotonative Generation Of Aryne Intermediates, Bryan Edward Metze

Dissertations and Theses

Arenes are a ubiquitous structural motif occurring in numerous organic pharmaceuticals, agrochemicals, secondary metabolites, and functional materials. As such, studies on the characterization, functionalization, and properties of arenes have been a central pillar of organic chemistry since its inception. Early methods to synthesize complex benzenoid rings focused on ring functionalization rather than ring construction due to the high accessibility of very simple arenes and the wide range of aromatic substitution reactions discovered in the late 19th century. As the importance of arenes was recognized more methods of building complex arenes emerged. Both classical and modern approaches are still somewhat limited, …

Automatic Measurement Of Dialogue Engagingness In Multilingual Settings, Amila Ferron

Dissertations and Theses

Expansive use of large language models (LLMs) as dialogue systems brings increased importance to the evaluation of the responses they generate. Although evaluation of qualities such as coherence and fluency are readily possible with well-established automatic metrics, engagingness is often measured with human evaluation -- a process that can be costly and slows the pace of development. Existing automatic metrics for engagingness have low to moderate correlation with human annotations, evaluate the response without the conversation history, are complicated to implement, or are designed for a specific dataset. Moreover, they have been tested exclusively on English conversations. Given that dialogue …

Primary Care In The University Setting After Covid-19: A Multiple Case Study Of Student Health Services In Oregon, D. Chad Johnson

Dissertations and Theses

In 2020, the COVID-19 pandemic disrupted operations across the settings of primary care and higher education institutions (HEI). HEIs faced sudden decreases in revenue because of reduced enrollments and external pressures to rapidly adapt delivery methods to accommodate the inability to provide in-person classes. Similarly, most primary care settings experienced major reductions to in-person visits and fee-for-service revenues. Student health services (SHS) exist within both primary care and higher education settings and are a unique and poorly understood aspect of primary care. This research set out to explore this under-studied primary care setting by answering the question: "How has COVID-19 …

Experiences Of Community College Stem Students In Transferring And Adapting To A Four-Year Urban University, Mackenzie Jade Gray

Dissertations and Theses

Ensuring that the bachelor's degree pathway that begins at a community college is a robust option for science, technology, engineering, and mathematics (STEM) students will be key for addressing the calls to increase and diversify the future STEM workforce. Yet, students on this pathway currently face many structural barriers that can lead to attrition. In this work, we aim to understand the experiences of community college students as they transfer, adapt, and persist to graduation at an urban four-year university.

First, we used the Model for Analyzing Human Adaptation to Transition to explore the experiences of community college STEM students …

Some Hypergeometric Identities And Related Leonard Pairs, Taiyo Summers Terada

Dissertations and Theses

The notion of a Leonard pair was introduced by Terwilliger in 2001 to simplify Leonard's theorem, which classifies the orthogonal polynomials in the terminating branch of the Askey-Wilson scheme. In the same year, Kresch and Tamvakis made a conjecture about a certain ₄F₃ hypergeometric series while studying the arithmetic analogues of the standard conjectures for the Grassmanian G(2,n). The ₄F₃ series appearing in their conjecture is closely related to a family of orthogonal polynomials in the Askey-Wilson scheme. Consequently, the theory of Leonard pairs provides a useful framework for understanding their conjecture.

In …

Design And Test Of Asynchronous Systems Using The Link And Joint Model, Ebelechukwu Esimai

Dissertations and Theses

Asynchronous circuits offer numerous advantages, including low energy consumption and good composability and scalability. However, they remain meagerly adopted in the mainstream semiconductor industry. One reason is the limited number of design tools available to help designers navigate design complexity, particularly the myriad of asynchronous implementation styles.

This dissertation focuses on managing the myriad of asynchronous implementation styles by utilizing a circuit-neutral model, called Links and Joints, and embedding this Link-Joint approach into a design flow. Although years of past work have already laid the groundwork, the work in this dissertation identifies and addresses key missing pieces.

First, the …

Feeling Otherwise: A Hermeneutic Phenomenological Study Of Queer And Trans Youth Of Color Who Create And Embody Fursonas, Hazel Ali Zaman

Dissertations and Theses

Queer and trans youth of color are often the target of surveillance, bullying, discrimination, and abuse. However, in an attempt to navigate such violent and discriminatory circumstances, the queer and trans youth of color in this dissertation found refuge in furry art and performances, both online and offline, where they were able to express themselves freely and thus acquire a sense of belonging among others with similar experiences. In this dissertation, "a furry" is used to refer to an individual who self-identifies as one who has an affinity for anthropomorphic animal characters. A common practice among furries is creating a …

Computational Tools For Exploring Eigenvector Localization, Robyn Ashley Markee Reid

Dissertations and Theses

We develop computational tools for exploring eigenvector localization for a class of selfadjoint, elliptic eigenvalue problems regardless of the cause for localization. The user inputs a desired region R (not necessarily connected), a tolerance for the amount localization in R, and the desired energy range [a,b]. The tool outputs eigenvectors concentrated within the tolerance inside R and within [a, b]. We develop ample theory that justifies our algorithm, which involves a complex, compact perturbation of the operator L, Ls = L+isχR, for some (small) s > 0. Our central idea can be summarized as follows: if (λ,ψ) is an eigenpair of …

Social Justice In Social Work: A Critical Discourse Analysis, Erica Fonseca

Dissertations and Theses

Social justice is central to social work and guides the profession's ethics, educational standards, and practices. It is aspirational and actionable, ideological and practical, and is simultaneously shaped by, and shapes in turn, social work. Consequently, this study understands social justice to be a discourse. Despite its ubiquity throughout the profession, what constitutes social justice, how it should (or could) be practiced, and what epistemologies orient social work to the concept continue to be debated. Given social work's express promotion of social justice and the myriad ideas and practices that follow from this critical value, the concept and the foundational …

Atmospheric Circulation, Climate Change, And Related Impacts Over The Western United States, Graham Patrick Taylor

Dissertations and Theses

This dissertation characterizes the range of atmospheric circulation patterns and select associated meteorology impacting the northwest United States, the onset timing of rain and wind relevant to wildfire across the western United States, and how these may respond to global warming. The ability of a suite of models contributing to the sixth phase of the Coupled Model Intercomparison Project (CMIP6) to simulate observed large-scale atmospheric circulation patterns over the Pacific Northwest of North America is evaluated. Climate model projections of atmospheric circulation patterns, their frequency, and associated temperature and precipitation anomalies under a high-end global warming scenario are assessed over …

Urgent Care Program Influences On An Integrated Health Care System, Craig H. Carter

Dissertations and Theses

The Veterans Health Administration (VHA) is the most extensive integrated health care delivery system in the world with over 20,000 physicians, 1,600 facilities, and more than 400,000 employees, caring for nine million veterans. The health care provided covers traditional outpatient and hospital-based services such as primary care, surgery, critical care, mental health, orthopedics, pharmacy, radiology, and physical therapy. Most VHA facilities offer additional medical and surgical specialties such as audiology, speech pathology, dermatology, dental, geriatrics, urology, oncology, podiatry, prosthetics, and vision care. Some of the more extensive VHA facilities offer advanced health care services, such as organ transplants and plastic …

The Exploration Of Latino Bip Participants' Experiences Of Oppression And Expressions Of Critical Consciousness, Adrian Luis Manriquez

Dissertations and Theses

According to Freire (1970), individuals and groups who are systemically oppressed in society often develop and struggle with a sense of internalized oppression, and those who fail to address their own oppression will likely engage in the oppression of others. Conceivably, this is the state of affairs for Latino males who perpetrate intimate partner violence (IPV). However, Latinos who use IPV behaviors are often viewed solely as "villains" or oppressors (Corvo & Johnson, 2003), omitting the various contexts in which this subgroup of males might be subjected to oppressive conditions outside of their intimate relationships. This contributes to an absence …

A Deep Learning Framework For Blockage Mitigation In Mmwave Wireless, Ahmed Hazaa Almutairi

Dissertations and Theses

Millimeter-Wave (mmWave) communication is a key technology to enable next generation wireless systems. However, mmWave systems are highly susceptible to blockages, which can lead to a substantial decrease in signal strength at the receiver. Identifying blockages and mitigating them is thus a key challenge to achieve next generation wireless technology goals, such as enhanced mobile broadband (eMBB) and Ultra-Reliable and Low-Latency Communication (URLLC). This thesis proposes several deep learning (DL) frameworks for mmWave wireless blockage detection, mitigation, and duration prediction. First, we propose a DL framework to address the problem of identifying whether the mmWave wireless channel between two devices …

Geochemistry And Geochronology Of The Steens And Monument Dike Swarm: Implications And Relationships To Magmatic Storage And To Lava Flows Of The Picture Gorge And Steens Basalt, Rachel Anne Sweeten

Dissertations and Theses

The Columbia River Basalt Group (CRBG) is the youngest and best-preserved example of a continental flood basalt province. Vents and dikes for the four main eruptive units (Steens, Imnaha, Grande Ronde, and Picture Gorge Basalt) are the Monument, Steens and Chief Joseph Dike Swarms located in eastern Oregon, southeastern Washington, and northern Nevada.

Here we report on the compositions and timing of the dikes and sills of the Monument Dike Swarm (MDS), as well as their relationship to the subaerial lava flows of the Picture Gorge Basalt (PGB) with implications for crustal storage of these magmas. We evaluate data from …

Living On The Outskirts Of Things: Women And Nonbinary People Of Color With Cognitive Disabilities Describe Their Employment Experiences, Laura Spura Rodriguez

Dissertations and Theses

This study examines the experiences of discrimination and the strategies used to navigate employment for women of color and nonbinary people of color (POC) with cognitive disabilities (CD) through their own narratives. Using Dis/ability Critical Race Theory and an interpretive description methodology, this study engaged 10 women of color and/or nonbinary POC with CD in semi-structured interviews in order to answer the following research questions: 1) What stories do women of color and nonbinary POC with CD tell about their experiences seeking employment? 2) What are the narratives of women and nonbinary POC with CD about their experiences of racism, …

The Women Of The Oregon State Insane Asylum: 1900-1910, Rebekah Catherine Averette

Dissertations and Theses

This thesis explores the lives of female patients at the Oregon State Insane Asylum between 1900 and 1910 and examines the significance of that decade as a period of transition in asylum care from a moral treatment model to a focus on moral hygiene practices to subvert insanity before it took root and medicalized psychiatric treatment for severe or chronic cases requiring institutionalization.

At the turn of the twentieth century, state insane asylums were in the aspirational early stages of transforming into specialized psychiatric and medical hospitals. Ultimately, the hoped-for transformation would not materialize in a meaningful way until well …

Residential Ders In Service-Oriented Load Participation: Enhancing Grid Flexibility, Zhongkai Zeng

Dissertations and Theses

Amidst concerns about power consumption during peak periods and potential grid instability, the role of Distributed Energy Resource (DER) aggregation comes into consideration. Smart electric water heaters with remote capabilities and energy storage offer load reduction capabilities that can help maintain grid stability and manage residential energy consumption. DERs address challenges posed by stochastic renewable energy generation and fossil fuel power plant emissions, playing a contributing role in load shifting and enhancing grid flexibility by participating in energy management programs.

However, high unenrollment rates in demand response programs, notably programs that use direct load control, persist due to customer dissatisfaction. …

H1-Conforming Finite Elements On Nonstandard Meshes, Samuel Edward Reynolds

Dissertations and Theses

We present a finite element method for linear elliptic partial differential equations on bounded planar domains that are meshed with cells that are permitted to be curvilinear and multiply connected. We employ Poisson spaces, as used in virtual element methods, consisting of globally continuous functions that locally satisfy a Poisson problem with polynomial data. This dissertation presents four peer-reviewed articles concerning both the theory and computation of using such spaces in the context of finite elements. In the first paper, we propose a Dirichlet-to-Neumann map for harmonic functions by way of computing the trace of a harmonic conjugate by numerically …

Immigration Policy Evaluation For Technology Professionals Immigrants In The United States, Angel Contreras Cruz

Dissertations and Theses

The U.S. Immigration System is complex for technology professionals seeking to relocate to the United States for employment or education. The United States relies on its employment-based immigration to attract and select the best talent to fill the shortage of skilled jobs. Technology professionals, a stream of highly skilled immigrants, tend to contribute and be more beneficial to the U.S. economy, which is one of the principles of U.S. immigration policies. Although U.S. immigration policies are constantly updating, policymakers, experts, and scholars suggest that the United States needs significant immigration reform to solve current issues, such as improving technological capabilities …

Is This My Place? Contributing Factors To Community College Students' Longitudinal Sense Of Belonging And The Connection Of Sense Of Belonging To Student Success, Kelly Elizabeth Love

Dissertations and Theses

Community colleges serve a large percentage of historically under-represented populations including students of color, low-income, and first-generation students. Unfortunately, less than half of students who begin at a community college return the following Fall and only about one-fourth of students eventually graduate. Previous research indicates that students' sense of belonging may be a key factor in retention and completion rates. However, large-scale datasets have yet to comprehensively explore students' sense of belonging in the community college setting. To address that issue, the purpose of this quantitative exploratory study was to examine individual and institutional variables associated with a measure of …

Permission To Play: A District's Initiative To Innovate Kindergarten And Promote Developmentally Appropriate Practices, Cristin Mcdonough

Dissertations and Theses

Kindergarten's original purpose was to promote socialization skills for young children using play. However, recent research has shown an increased focus on teaching literacy and math skills, combined with pronounced increases in more advanced academic tasks and activities. Given this shift in kindergarten, as well as a lack of professional development for teachers to assist them in promoting developmentally appropriate practices, the Kindergarten Innovation Cohort was created in the Portland School District to address these needs for both students and teachers. Using findings from interviews and field notes, the current study addresses the question: What does the implementation of the …

Designing For Deployable, Secure, And Generic Machine Learning Systems, Li-Yun Wang

Dissertations and Theses

Machine learning systems have catalyzed numerous image-centric applications owing to the significant achievements of machine learning algorithms and models. While these systems have showcased the efficacy of machine learning models, certain challenges persist, such as machine learning system design and security vulnerabilities inherent in deep neural networks. Moreover, the deployment of deep neural network models remains a significant hurdle. This dissertation introduces a multimedia prototyping framework tailored for visual analytical applications, improving the reusability of video analysis software tools with minimal performance overhead. Furthermore, we present novel image-processing techniques designed to bolster the robustness of deep neural networks and propose …

Quantum Search Algorithms For Constraint Satisfaction And Optimization Problems Using Grover's Search And Quantum Walk Algorithms With Advanced Oracle Design, Abdirahman Sheikh Hassan Alasow

Dissertations and Theses

The field of quantum computing has emerged as a powerful tool for solving and optimizing combinatorial optimization problems. To solve many real-world problems with many variables and possible solutions for constraint satisfaction and optimization problems, the required number of qubits of scalable hardware for quantum computing is the bottleneck in the current generation of quantum computers. In this dissertation, we will demonstrate advanced, scalable building blocks for the quantum search algorithms that have been implemented in Grover's search algorithm and the quantum walk algorithm. The scalable building blocks are used to reduce the required number of qubits in the design. …

Co-Designing With First-Generation Transfer Students, Randi Petrauskas Harris

Dissertations and Theses

Roughly 80% of community college students indicate that they intend to transfer to a four-year institution, 30% of those students eventually transfer, and 13% of those students persist to graduate with a baccalaureate degree. There has been previous research on transfer students and on first generation students, but the intersection of first-generation transfer students is under-reported. Prior research indicates that sense of belonging is an important factor in student persistence to graduation for transfer students. Higher education institutions, specifically four-year public institutions, are positioned to support first-generation transfer student sense of belonging by fostering a "transfer receptive culture." Recognizing that …

Doubly Almost Bipartite Leonard Pairs, Shuichi Masuda

Dissertations and Theses

In Linear algebra, the concept of Leonard pair (LP) was motivated by the theory of Q-polynomial distance-regular graphs. In this dissertation, we will first give a brief introduction to LPs and to two closely-related classes of objects: (i) bipartite Leonard pairs (BLPs) and (ii) almost bipartite Leonard pairs (ABLPs). Taking these as departure points, we will introduce a new class of object - doubly almost bipartite Leonard pairs (DABLPs). The primary aim of our work is to fully classify (up to isomorphism) this new family. In addition, since there is known to be a natural correspondence between Leonard pairs …

Understanding Waveguides In Resonance, Pieter Johannes Daniel Vandenberge

Dissertations and Theses

Several important classes of modern optical waveguides, including anti-resonant reflecting and photonic bandgap fibers, make use of geometries that guide energy in low refractive index material, a property that makes them of significant interest in numerous applications, notably including high-power delivery and guidance. These waveguides frequently exhibit resonance phenomena, in which their ability to propagate an input signal is sharply curtailed at particular operating frequencies. In this work we detail new advances in understanding these resonance effects and their implications for numerical modeling of these structures.

Part 1 focuses on the fields of slab waveguides, relatively simple structures for which …

The Wage Of Wellness: The Relationship Between Socioeconomic Status, Race, And Work Recovery, Emily Julia Ready

Dissertations and Theses

A substantial share of the workforce is made up of low-income workers. Many of these workers fall below the federal poverty line and are considered low socioeconomic status (SES) and are disproportionately more likely to be racial minorities. However, this population is often neglected in the industrial-organizational psychological literature. Specifically, work recovery research has not considered the unique life circumstances of this particular group in the development of the research questions, theoretical framework, or practical implications in relation to this phenomenon. The purpose of the current study is to understand the relationship between socioeconomic status, race, and work recovery experiences …