Digital Commons Network^™

Participatory Mapping Of Tree Equity, Preferences, And Environmental Justice In Portland, Or, Katharine Vezin Gregory

Dissertations and Theses

Studies have shown that marginalized communities do not have the same access as more privileged groups to urban tree canopy cover due to historic and current processes of discrimination and disinvestment. This study explores the lived experiences, narratives, and values related to trees and greenspaces for residents of Portland, OR, through participatory mapping focus groups. It uses an environmental justice and urban political ecology framework to examine how values, lived experiences, and narratives compare for Portland residents across neighborhoods, socio-economic status, and racial or ethnic identity and how the changes that matter to residents can inform more just urban greening …

Community Supervision: Perspectives Of Probation And Parole Officers And Supervisors On Key Supervision Approaches And Policy Changes, Asianna Nelson

Dissertations and Theses

This study explores the differences across community supervision approaches in Oregon and how the implementation of state policies has influenced this field. Therefore, this study seeks to answer the following research questions: 1) How do POs and supervisors define their approach to community supervision? 2) How have POs and supervisors experienced shifts in state policy? Fourteen line staff and supervisors from seven Oregon probation and parole agencies were interviewed to answer these research questions. The findings suggest that most agencies are using evidence-based practices and implementing state policies. However, variation exists across the represented agencies in the experiences and perceptions …

Systematic Characterization Of Power Side Channel Attacks For Residual And Added Vulnerabilities, Aurelien Tchoupou Mozipo

Dissertations and Theses

Power Side Channel Attacks have continued to be a major threat to cryptographic devices. Hence, it will be useful for designers of cryptographic systems to systematically identify which type of power Side Channel Attacks their designs remain vulnerable to after implementation. It’s also useful to determine which additional vulnerabilities they have exposed their devices to, after the implementation of a countermeasure or a feature. The goal of this research is to develop a characterization of power side channel attacks on different encryption algorithms' implementations to create metrics and methods to evaluate their residual vulnerabilities and added vulnerabilities. This research studies …

In Their Words: Prospective Teachers' Experiences As A Context For Investigating Their Views Of Authority In A Mathematics Classroom, Brenda Lynn Rosencrans

Dissertations and Theses

Mathematics teacher educators enact inquiry-based preparatory courses with the underlying expectation that their students (prospective teachers) will take ownership (authority) of their mathematical learning through sharing their ideas and collaboratively discussing the reasonableness of their shared ideas. Yet, prospective teachers' expectations are often not yet in alignment with those of mathematics teacher educators, instead they enter these courses expecting their instructors to provide clear examples and directions for how to solve mathematics problems. This project investigates this dynamic through an authority lens, seeking to understand and characterize different views of authority prospective teachers hold and the impact these views have …

Who Puts The "Support" In Supportive Housing? The Impact Of Housing Staff On Resident's Well-Being, And The Potential Moderating Role Of Self-Determination, Kenna Estell Dickard

Dissertations and Theses

The provision of residential and community-based services for individuals with serious mental illness (SMI) has become increasingly important following the deinstitutionalization movement. Much of the existing research on supportive housing focuses on housing outcomes rather than exploring how the program helps its residents thrive in the broader community. This study draws upon data collected from 176 people with SMI residing in 16 supportive housing locations in Portland, Oregon. Analyses employed an ecological approach, exploring how housing staff support relates to residents' well-being at three levels of analysis: loneliness (interpersonal level), residential satisfaction (housing and neighborhood level), and sense of community …

Developing And Testing Low-Cost Air Cleaners For Safer Spaces During Wildfires, Brett William Stinson

Dissertations and Theses

Air cleaning reduces indoor exposure to fine particulate matter (PM_2.5) during wildfire events. However, resource and cost restraints may limit access to air cleaning during such an event, as both commercial devices and the high-rated MERV filters that homemade assemblies typically rely upon tend to be expensive and in short supply. With these barriers in mind, we sought to develop and evaluate the potential for air cleaners that use common household fabrics as filtration media. Evaluated designs use a box fan to move air across fabric filters; box fans are inexpensive and readily available to many households. Ultimately, …

Understanding Influenza Vaccine Hesitancy And Uptake Among U.S. Hispanic Adults During The Covid-19 Pandemic, Helen J. Arteaga

Dissertations and Theses

The health burden caused by seasonal flu is substantial in the general population and each season targeted efforts are needed to decrease the risk of flu illness, hospitalization, and death. Flu risks and the disease burden are disproportionately higher among Hispanic adults, yet little is known about the factors influencing flu vaccine hesitancy and uptake among this marginalized population. This cross-sectional quantitative study used national survey data from the Understanding America Study (UAS) and logistic regression to address three research aims. Aim 1 was to examine the most significant demographic factors associated with flu vaccine uptake among the Hispanic community. …

Forecasting Migration To The United States From Hong Kong And India, Priyanka [email protected]

Dissertations and Theses

This study investigates the forecasting of migration from India and Hong Kong to the United States. To study this, quantitative design is employed so numerical data can be used. The proposed research strategy uses the post-positivism approach, as this method can help with looking for explanations via numerical data. The data collection is through using archived data available from the Department of Homeland Security’s website, which is analyzed using descriptive and inferential analysis. The results show how migration trends increase for India but slowly decrease for Hong Kong, along with the best models used to forecast migration.

Investigating Interpersonal And Community Drivers Of Taenia Solium Prevention To Reduce Acquired Seizure Disorders In Northern Peru: An Analysis Of Social Networks, Social Capital, And Community-Identified Barriers And Facilitators, Angela Gayle Spencer

Dissertations and Theses

Background: In Northern Peru and other low- and middle-income countries (LMICs) worldwide, the Taenia solium parasite causes an estimated 30% of acquired epilepsy -- an entirely preventable disease burden. Sanitation development and pork production regulation would reduce infection risk in endemic communities, but large-scale systemic improvements are not likely to occur in the near future. In the meantime, communities can reduce infection risk by adopting protective behaviors. Social networks can provide role modeling and support for health-promoting behaviors, and deliver social capital in the form of trusting relationships, norms of reciprocity, and information exchange in support of T. solium control. …

A Deep Hierarchical Variational Autoencoder For World Models In Complex Reinforcement Learning Environments, Sriharshitha Ayyalasomayajula

Dissertations and Theses

Model-based reinforcement learning (MBRL) approaches leverage learned models of the environment to plan and make optimal decisions, reducing the need for extensive real-world interactions and enabling more efficient learning in complex domains such as robotics, autonomous systems, and resource allocation problems. They also provide interpretability and insight into the underlying dynamics, facilitating better decision-making and system understanding.

The world model is a model-based RL approach that employs generative neural network models to learn a compressed spatial and temporal representation of the environment. This work explores world models and a simple single-layered RNN model to learn a simple policy based on …

Do Frameworks Matter? Testing The Framing Effect On Public Support For Prison Pell Grants, Natalie Miles Burke

Dissertations and Theses

Postsecondary college education (PSCE) services are a rehabilitative program that offers adults in custody (AICs) the opportunity to earn a college degree while incarcerated. Research has shown that AICs participating in PSCE services reduce the likelihood of future incarceration as well as higher self-esteem and confidence levels. In 2015, President Obama’s Second Chance Pell Pilot program reinstated federal financial aid for AICs to access PSCE services. Although the Second Chance Pell Pilot program has continued to grow since then, little research has been done on public perceptions toward prison Pell Grants.

This thesis studies how offender crime type and sentence …

Son Otros Tiempos: Generational Experiences Of Male Friendships Amongst Mexican And Mexican American Men, Marisela Rodríguez Molina

Dissertations and Theses

Culturally specific work with Latinx men has also discussed the way Latinx masculinities are being redefined by younger generations. Grounded in Chicana Feminist epistemologies, I use Gloria Anzaldua's borderlands framework to analyze data from 20 interviews with sons and their father figures in understanding experience of masculinities within the context of male friendships. Differences between father's and son's experiences can be attributed to social context in which men are socialized and their borderlands experiences. Findings illustrate how understandings of masculinities represent a melding of cultural values between the dominant individualistic perspective in the U.S. and the collectivist perspective from men's …

Improving Peer-To-Peer Learning For Students With Extensive Support Needs In Inclusive Classrooms, Zachary Michael Deets

Dissertations and Theses

Inclusive learning opportunities lead to better outcomes for students with extensive support needs (ESN). In the absence of targeted intervention, however, students with ESN are unlikely to interact meaningfully with their peers or the general education curriculum. The literature describes evidence-based strategies in support of the meaningful inclusion of students with ESN in inclusive classrooms, including the use of technology to mediate learning experiences and nondisabled peers as learning "interventionists." This dissertation introduces an intervention package, Technology-Assisted Peer-Mediated Academic Support (TAPMAS), incorporating Technology-Aided Instruction and Intervention (TAII) and Peer-Based Instruction and Intervention (PBII), as a model of how educators may …

An Integrated Analysis Of Urban Sustainability In Portland: Issues, Indicators, Stakeholders, And Geospatial Assessment, Arun Kumar Pallathadka

Dissertations and Theses

This dissertation presents three individual studies that collectively explore the concept of urban sustainability. The research is grounded in the recognition that many cities worldwide are striving to achieve sustainable development, yet existing sustainability frameworks often lack comprehensive definition and consideration. Moreover, the existing sustainability frameworks and methods are often not clearly structured to allow for their replication and adaptation to meet the unique needs of diverse local settings. To address this gap, the dissertation utilizes the Social-Ecological-Technological Framework, with particular emphasis on equity, to investigate key issues in urban sustainability, such as indicators, stakeholder engagement, tradeoffs, and assessment. The …

The Factors Contributing To The Resilience Of Thailand's Social Welfare Nonprofit Organizations Since The Onset Of The Country's Prolonged Political Crisis In 2005, Narttana Sakolvittayanon

Dissertations and Theses

Since 2005, nonprofit organizations in Thailand, a transitive country, have experienced survival challenges due to social, economic, and political changes. This study aims to explore the organizational attributes of nonprofit organizations in Thailand that contribute to resilient capacity, which is an ability to survive and continue providing goods and services to fulfill missions when facing challenges. The research questions of this study are what factors have affected the resilience of social welfare nonprofit organizations in Thailand since the onset of the country’s prolonged political crisis in 2005? And to what extent do theories of nonprofit resilience in advanced liberal democracies …

Creating Regression Model For Non-Markov Transition Probability Using Pseudo-Observations, Michael Gray

Dissertations and Theses

A multi-state model is a graphical tool widely used to illustrate a transitional relationship between states in many applications. We will study the transition probabilities of an illness-death model, which is an example of a multi-state model. We will investigate transition probabilities using a counting process approach. Aalen-Johansen estimator is the gold-standard in estimating a transition probability. However, Aalen-Johansen estimator may be biased when the Markov assumption is violated. Therefore, Aalen-Johansen estimator is an unreliable estimator when the Markov assumption is violated. Several papers have published non-parametric estimators that accommodate for non-Markov models using a counting process approach.

Furthermore, there …

Care Remittances: Farmworkers' Political Knowledge And Hemispheric Information Practices During The Covid-19 Pandemic, Jennifer Martinez-Medina

Dissertations and Theses

Information is the building block of democracy. Yet, dominant political theories assume different groups within the political system acquire, process, and use information similarly, even as the golden age of globalization has sparked new forms of cross-border political exchanges. Despite a flourishing literature by interdisciplinary social scientists, gaps remain in our understanding of how transnational information circuits shape political knowledge and democratic judgments of groups in host and home countries, especially among so-called "information poor" agricultural workers who often live in precarious conditions. Using a mixed-methods analysis based on the community-engaged Oregon COVID-19 Farmworker Study (OR COFS) and interviews with …

Survival Times And Investment Analysis With Dynamic Learning, Zhenzhen Li

Dissertations and Theses

The central statistical problem of survival analysis is to determine and characterize the conditional distribution of a survival time given a history of some observed health markers.

This dissertation contributes to the modeling of such conditional distributions in a setup where the health markers evolve randomly over time in a manner that can be represented by an Ito stochastic process, that is, a stochastic process that can be written as a sum of a time integral of some stochastic process and an Ito integral of some stochastic process, with both integrands subject to certain restrictions.

The random survival time is …

Contextualizing The Role Of Answerers' Gaze Orientation In Turn Taking, Cassidy Moore

Dissertations and Theses

This thesis extends our understanding of the role of gaze orientation in turn taking, answering the following research question: When an answerer withdraws their gaze from a questioner at the completion point of the first turn-constructional unit of their answer, is this a practice for communicating that their answer-turn-so-far is not transition relevant (i.e., that the answerer is not complete with their turn and will continue speaking)? Data are videotapes of 274 information-seeking sequences drawn from 28 dyadic, mundane, English conversations between close friends. The methods are mixed, including conversation analysis and coding for statistical purposes. Data were transcribed for …

Identifying Advantages To Teaching Linear Regression In A Modeling And Simulation Introductory Statistics Curriculum, Kit Harris Clement

Dissertations and Theses

Statistical association is a key facet of statistical literacy: claims based on relationships between variables or ideas rooted in data are found everywhere in media and discourse. A key development in introductory statistics curricula is the use of simulation-based inference, which has shown positive outcomes for students, especially in regards to statistical literacy and conceptual understanding. In this dissertation project, I investigate students from the Change Agents for the Teaching and Learning of STatistics (CATALST) curriculum in activities I designed for learning statistical association and linear regression. First, I analyzed the informal line fitting strategies of CATALST students. Findings suggest …

The Health Impacts Of The Trump Administration Among California Immigrants, Claudia M. Calhoon

Dissertations and Theses

Immigration policy was a marquee issue in the US presidential administration of Donald Trump. Trump’s administration employed both policy and rhetoric related to immigrants to mobilize voters, alter immigration policies and practices, and sustain a narrative of a nation under attack by immigrants. Administration officials were able to undertake these approaches because of existing immigration law, but they did so in more explicitly punitive ways than in recent administrations. The goal of this dissertation is to explore the health impacts of the administration’s practices and their effects. Paper 1 analyzes the immigration rhetoric and policies of US president Donald Trump …

Improving Microbiome Research Through Enhanced Reporting And Modeling The Effects Of Antibiotic Usage, Chloe A. Mirzayi

Dissertations and Theses

I consider two key areas in the growing field of human microbiome research: improving the quality of study reporting and the impact of antibiotics on participants in human gut microbiome research studies. In the first chapter, a team of evaluators used the Strengthening the Organization and Reporting of Microbiome Studies (STORMS) checklist to assess recently published microbiome literature. I found moderate agreement and reliability between evaluators, identified several items in STORMS that could be improved, and confirmed that the STORMS checklist can serve as a tool for assessing the reporting quality of published microbiome study. The next chapter considers pre-exposure …

A Policy Proposal For Agricultural Data Governance, Ana Sofía Castellanos Santamaría

Dissertations and Theses

As the digital economy continues to grow and data becomes increasingly important, effective data governance is essential. A data governance framework enables the efficient management, sharing, and integration of data, resulting in better decision-making, increased productivity, and enhanced innovation across industries, including agriculture. However, the agricultural sector in the United States is lagging behind other industries in the adoption of effective data governance practices. Agricultural data governance presents a unique set of challenges due to the wide range of stakeholders involved and the ever-increasing volume of data generated by digital technologies in farming. One key challenge to achieving the benefits …

Uhv-Shear-Force Acoustic Near-Field Microscopy And Its Implementation In The Study Of Confined Mesoscopic Fluids, Theodore Alex Brockman

Dissertations and Theses

The design, construction, and implementation of Shear-force Acoustic Near-Field Microscopy (SANM), operational from ultrahigh vacuum (UHV) to ambient conditions--offering a pristine environment for more reliable characterization the hydrophobic/hydrophilic wetting properties of surfaces--is presented. SANM capitalizes on its sensitivity to the evanescent near-field acoustic emissions from a mesoscopic fluid (confined between the apex of a laterally oscillating tapered nanosized probe and a flat substrate) when subjected to shear motion. This distinct capability provides direct access to the fluid’s viscoelastic response when subjected to shear interactions, in contrast to indirect measurements performed by other standard probe proximity scanning techniques. The entire …

"I Stayed There The Whole Night": Exploring Caregivers' Experiences With The Healthcare System When Caring For A Parent At The End Of Life, Lillian Mehran

Dissertations and Theses

Background: In the United States, there are nearly 53 million individuals serving as caregivers to a loved one. Half of all caregivers are caring for a parent or parent-in-law, and 79% of caregivers are caring for a person aged 50 or older. In New York State, there are an estimated 4.1 million caregivers who collectively provide over 2.6 billion hours of unpaid care, with those caring for a person at the end of life providing twice as many hours of caregiving per week compared to other caregivers. The number of individuals requiring caregiving is expected to increase as a significant …

Earthbound In The Anthropocene: Spirituality, Collective Identity, And Participation In The Direct Action Climate Movement, David Alan Osborn

Dissertations and Theses

Climate change, as part of a broader ecological crisis, is becoming an ever more potent event structuring human societies and planetary ecosystems. As the climate crisis deepens, climate change is unsettling core human identities, as well as the ontologies that define and situate concepts of "human" and "nature." And as social movements act to challenge and mitigate the catastrophes arising in the Anthropocene era, the question of how to sustain participation is critical. This dissertation explores these dynamics through a study of spirituality, collective identity, participation, and ontology in a subset of the climate movement. The research questions were: (1a) …

Evaluation Of A Place-Based Asthma Reduction Initiative On Asthma-Related Morbidity Among Children In East Harlem And The Impact Of The Covid-19 Pandemic On Health Care Utilization And Medication Adherence Among Medicaid-Enrolled Children, Sarah C. Walters

Dissertations and Theses

Background: In New York City, asthma continues to be the leading cause of hospitalizations and emergency department (ED) visits among children, and disproportionally burdens Black and Latino children in low-income neighborhoods. Place-based, or geographically targeted, programs offer upstream strategies for addressing public health issues in these underserved neighborhoods, and given their targeted nature, quasi-experimental or other observational methods are needed to rigorously evaluate their impact. This dissertation uses multiple methodological approaches to assess the impact of the East Harlem Asthma Center of Excellence (EHACE) – an equity-focused, multi-faceted, place-based asthma mitigation initiative in the East Harlem neighborhood of a New …

Obesity Risk And Comorbidities Among Colombians In New York City And In Colombia, Carlos A. Devia

Dissertations and Theses

Introduction: The prevalence of obesity and overweight in adults and children continues to increase worldwide, accounting for the mortality and morbidity from several diseases. Obesity disproportionally impacts Latinos in the United States (U.S.), and despite their diversity in origins, ancestry, and culture, it is still unclear the burden of obesity by specific Latino groups. For example, little information is available about how obesity impacts Colombians in the U.S. (the largest South American population). New evidence also indicates that Latino immigrants may no longer be arriving with healthy weight status to the U.S. because Latin American countries are undergoing epidemiologic and …

Investigating And Mitigating The Harmful Impact Of Precarious Employment On The Health And Well-Being Of New York City Food Workers, Emilia F. Vignola

Dissertations and Theses

Much of the United States (US) food chain – from production to processing, wholesale, retail, and services – is characterized by precarious employment, defined as work with little employment security, inadequate income, and limited rights and protections. Studies show that precarious employment is associated with adverse mental and physical health and well-being outcomes. Separate research indicates numerous health issues in certain segments of the food workforce; little scholarly work has explored the contribution of precarious employment as an upstream driver of these health issues. Gaps remain in our understanding of 1) the health needs and status of workers across the …

Inequalities In Infant Birthweight By Social Position And Residential Neighborhood Characteristics In New York City, 2012-2018, Christina I. Nieves

Dissertations and Theses

BACKGROUND: Birthweight is an important indicator of health for infants, as low birthweight is associated with adverse health outcomes for infants and children. In the United States (U.S.), there are significant birthweight inequities by several maternal characteristics including maternal race/ethnicity, age, education, and nativity status. For example, the prevalence of low birthweight among Black infants is double the prevalence among white infants (14% vs. 6.9%, respectively). These health inequities are caused, in part, by unjust systems, policies, and practices rooted in interlocking systems of oppression, like racism. These systems of oppression affect individuals directly as well as the contexts in …