Digital Commons Network^™

Diverging Impacts Of Organizational Dei Practices: The Role Of Objective And Subjective Group Status, Julia Oberlin, Claudia Toma, Tessa L. Dover

Psychology Faculty Publications and Presentations

Purpose – While DEI practices aim to enhance the outcomes of disadvantaged groups, their impact remains uncertain, with disparities often persisting. This paper examines whether the accumulation of DEI practices helps reduce psychological and work disparities between employees, considering both their objective (e.g. gender and race) and subjective (or perceived) (dis)advantage.

Design/methodology/approach – Study 1 surveyed 602 employees to assess the impact of perceiving their organization as having many orfew DEI practices on theirsense ofinclusion and job satisfaction. Study 2 used an experimental design (N 5 739) to extend the findings of Study 1 by manipulating the number of DEI …

A Projector-Rank Partition Theorem For Exact Degrees Of Freedom In Experimental Design, K. G. Nagananda

Mathematics and Statistics Faculty Publications and Presentations

In many experimental designs—split-plots, blocked or nested layouts, fractional factorials, and studies with missing or unequal replication—standard ANOVA procedures no longer tell us exactly how many independent pieces of information each effect truly contributes. We provide a general degrees of freedom (df) partition theorem that resolves this ambiguity. For N observations, we show that the total information in the data (i.e., N −1 df) can be split exactly across experimental effects and randomization strata by projecting the data onto each stratum and counting the df each effect contributes there. This yields integer df—not approximations—for any mix of fixed and random …

Lrq-Solver: A Transformer-Based Neural Operator For Fast And Accurate Solving Of Large-Scale 3d Pdes, Peijian Zeng, Guan Wang, Haohao Gu, Xiaoguang Hu, Tiezhu Gao, Zhuowei Wang, Aimin Yang, Xiaoyu Song

Electrical and Computer Engineering Faculty Publications and Presentations

Solving large-scale PDEs on complex three-dimensional geometries remains a central challenge in scientific and engineering computing, often due to expensive pre-processing stages and high computational overhead. We present Low-Rank Query-based PDE Solver (LRQ-Solver), a physics-integrated deep learning framework for efficient CAE simulations of complex three-dimensional geometries in CAD-driven design analysis. Built upon the Parameter-Conditioned Lagrangian Modeling (PCLM) that embeds physical consistency into the learning process and the Low-Rank Query Attention (LR-QA) module that reduces attention complexity from O(N2) to O(NC2+C3) via covariance decomposition, LRQ-Solver supports multi-configuration analysis within iterative design workflows. On two benchmark datasets, it achieves a 28.6% error …

A Profile Of Assisted Living Direct Care Workforce Training Requirements Across The United States, Erh-Chi Hsu, Paula Carder, Lindsey Smith, Zhiqing E. Zhou, Olga Yakusheva, Anna S. Beeber, Eric Jutkowitz, Kali Thomas

Institute on Aging Publications

Objectives

To characterize assisted living (AL) direct care worker (DCW) training requirements across the United States and how these regulations have changed over time. Specifically, we examine state-level profiles of training regulations, including duration, frequency, content, source of materials, evaluation, and changes in regulatory coverage.

Design

Cross-sectional and longitudinal descriptive study using state policy data and AL directories from 2019, 2021, and 2023.

Setting and Participants

All US states' AL training–related regulations; all ALs and AL beds governed by those regulations.

Methods

We used a mixed-methods approach with an explanatory sequential design (QUAN → qual), first conducting health services regulatory …

Factors Influencing Enterprise Adoption Of Ai-Enabled Computers: An Expert Judgment Quantification Approach Across Multiple Sectors, Yu Shan Su, Tugrul Daim, Chia-Hao Hung, Leong Chan, Dana Bakry

Engineering and Technology Management Faculty Publications and Presentations

This study examines the key factors influencing the adoption of Artificial Intelligence Personal Computers (AIPCs) by enterprises, exploring both the benefits and challenges of their business applications. As enterprises increasingly require real-time computing, autonomous decision-making, and improved cybersecurity, AIPC—combining artificial intelligence and edge computing—has become a strategic technology for boosting competitiveness. Particularly in scenarios with less reliance on cloud services, businesses are more likely to adopt devices with local processing and standalone AI capabilities to meet the dual needs of operational efficiency and data privacy. Through an extensive review of the literature, this study identifies four main dimensions and sixteen …

The Effects Of Pluss: Adapting An Evidence-Based Reading Intervention For Multilingual Learners, Amanda K. Sanford, Christopher J. Pinkney, Sheldon Loman, Julie Esparza Brown, Theresa Just, Kendall Flori, Camila Swift, Holly Ramstead

Educator Licensure Faculty Publications and Presentations

The effects of an evidence-based literacy intervention with and without added supports to address the unique needs of multilingual learners (MLs) were assessed through an ABAB single-case withdrawal design. The dual dependent variables were reading fluency/accuracy and performance on the workbook that included spelling, vocabulary, and reading comprehension tasks. Three students (one each in second, third, and fourth grades) who qualified for English language development services and exhibited low reading performance (second and third graders) or were identified with a reading disability (fourth grader) participated. From the initial baseline phase (A1) to the final intervention phase (B2), adding supports specific …

Superiorgat: Graph Attention Networks For Sparse Lidar Point Cloud Reconstruction In Autonomous Systems, Khalfalla Awedat, Mohamed Abidalrekab, Gurcan Comert, Mustafa Ayad, Negash Begashaw

Electrical and Computer Engineering Faculty Publications and Presentations

LiDAR-based perception in autonomous systems is fundamentally limited by sparse vertical sampling and further degraded by structured beam dropout caused by occlusions, sensor faults, or reduced-cost LiDAR hardware. These degradations disrupt vertical geometric continuity and negatively affect downstream perception tasks such as object detection, localization, and scene understanding. Existing reconstruction approaches often struggle to balance reconstruction accuracy with the computational efficiency required for real-time autonomous operation. This paper presents SuperiorGAT, a graph attention–based framework for reconstructing missing elevation information in sparse LiDAR point clouds under structured beam loss. The proposed method models LiDAR scans as beam-aware graphs and enhances standard …

Not Merely A Workaround: Theorizing Asynchronous Math Talks As A Robust Instructional Routine For Visible Thinking, Participation, And Engagement In Mathematics Teacher Education, Simon Byeonguk Han

Dissertations and Theses

The sudden global shift due to COVID-19 accelerated the need for a better understanding of mathematics learning and teaching in an asynchronous format. Also, despite the popular use of mathematics instructional routines in mathematics classrooms, the field of mathematics education research has very limited empirical studies on instructional routines. This dissertation addresses this by examining Asynchronous Math Talks (AMTs), a structured instructional routine adapted from Number Talks. The central goal of this research is to develop and theorize AMTs not merely as an online workaround, but as a robust instructional model that leverages the unique affordances of digital platforms to …

Epidemic Dynamics Under Pulse Population Exchange, Hannah Kravitz, Christina Durón, Moysey Brio

Mathematics and Statistics Faculty Publications and Presentations

Many epidemiological models assume either closed populations or continuous demographic turnover. We consider an intermediate setting in which exchange occurs through discrete pulses. In this paper, we introduce a population-conserving compartmental epidemiological model with pulse population exchange at a set of prescribed times. At each pulse, a fraction of the population in each compartment is replaced by a combination of susceptible and immunized individuals. In contrast to typical pulse birth or pulse vaccination models where only a single compartment undergoes a pulse population change, the pulses in this model have competing effects: removing infectious individuals reduces the force of infection, …

Exploring The Intersectional Identities Of Youth Mentees And Their Mentors In Shaping The Quality And Duration Of Their Relationships, Kristian V. Jones, Theresa N. Melton, Amy J. Anderson, Thomas E. Keller, David L. Dubois

School of Social Work Faculty Publications and Presentations

Mentoring programs enjoy considerable empirical support as a strategy for supporting the positive development of youth, particularly those with marginalized identities (e.g., minoritized racial identities) and/or from economically disadvantaged backgrounds. There tends to be considerable variability, however, in both the quality of the mentor–mentee relationships established through programs and whether these relationships are sustained for intended periods of time. Research indicates these features of relationships can be significant influences on the outcomes of participating youth, thus making it imperative to better understand the factors that may contribute to mentoring relationship quality and duration. To expand inquiry in this area, the …

Degree Assortativity And Estimation Of Degree Distribution In A Contact Network Of People Who Inject Drugs, Peter Geissert

Dissertations and Theses

This dissertation analyzes data from a respondent driven sampling (RDS) study of people who inject drugs in Portland, OR.  The objective was to assess assumptions for the use of weighted estimators to estimate a population physical contact (syringe sharing) network degree distribution.

Visualization of degree distribution for social and physical networks, Kolmogorov-Smirnov tests of difference, and kernel tests of equivalence were used for comparison of distributions. Spearman's rho and GAM non-parametric regression models were used to test for association and assess non-monotonic relationship. The validity of Markov chain assumptions for RDS was assessed using a transition matrix, Markov chain graphs, …

God's Not Neutral: Narrative Tropes, Spiritual Warfare, And The Construction Of Evangelical Political Identity In American Christian Fiction, Evelyn L. Mccullough

Dissertations and Theses

Evangelical Christian fiction has reached tens of millions of readers and viewers during the most sustained period of evangelical political mobilization in American history, yet its narrative construction remains largely unexamined. This study asks how recurrent tropes in this genre build the attitudinal and emotional preconditions for political engagement. Combining systematic qualitative content analysis of eight texts spanning four decades (1986–2024) with Critical Discourse Analysis grounded in van Dijk's sociocognitive framework, it traces how storytelling devices connect theological belief to political behavior. The analysis reveals a single organizing logic: the corpus holds one regressive heroic disposition constant while making it …

Extending W-Event Differential Privacy To The Publish-Subscribe Framework, Jacob Jerome Olinger

Dissertations and Theses

Internet of Things (IoT) devices have become ubiquitous, permeating both enterprises and homes, and they increasingly rely on publish-subscribe (pub-sub) frameworks that give subscribers real-time, high-fidelity access to device data. For privacy and confidentiality, however, today's pub-sub systems largely stop at channel-level authentication, encryption, and access-control lists. These protect data in transit and restrict who may receive it, but place no quantitative limit on what a subscriber with legitimate access to messages can infer about its publishers.

We close this gap by extending w-event differential privacy to the pub-sub setting. We generalize it from count queries to any aggregate …

Northern Red-Legged Frog Terrestrial Movement And Connectivity In A Fragmented Peri-Urban Landscape, Alyson W. Yates

Dissertations and Theses

The movement and spatial ecology of amphibians is largely understudied, despite their imperiled conservation status. Landscape fragmentation by roads and other anthropogenic development features are known to affect amphibians in multiple ways pertaining to movement, often leading to population declines and exacerbating extinction risk. To mitigate these factors, wildlife managers can implement multidisciplinary strategies that seek to preserve or restore functional connectivity. However, these efforts require strong fundamental knowledge of how a species interacts with complex landscapes throughout their life cycle, including through their movement.

My thesis investigates multiple facets of northern red-legged frog (Rana aurora) spatial ecology …

Without A Map: A Lived Experience Study Of The Paths People Create Through Homelessness, Kathleen P. Conte, Susan Avila, Desiree' J. Duboise, Carlton Bone, Marisa A. Zapata, Transformational Research For Equity And Experience In Shelter (Trees) Committee

Homelessness Research & Action Collaborative Publications and Presentations

The Pathways to Housing Study examines how people experience and navigate homelessness and the systems intended to help them move toward stable housing. Conducted in Multnomah County, Oregon, the study used a participatory mixed-methods design co-led with the TREES lived experience committee. The first phase was reported in April 2026 included surveys with 541 people with current or recent experience of homelessness. The second phase, reported here, used in-depth interviews and journey mapping with 29 participants to explore how pathways through homelessness unfold over time and across service systems.

Findings demonstrate that homelessness pathways are rarely linear. Participants described entering …

Omoiyari In The Performance Of American Learners Of Japanese: An Analysis Of Second Culture Compilation And Pragmatic Transfer, Shizuka Fukuo

Dissertations and Theses

This thesis examines omoiyari (consideration for others) as a Japanese cultural theme by examining how it is enacted by native Japanese speakers and American learners of Japanese during an invitation scenario. L2 learners' incorporation of the target culture's linguistic and behavioral norms is essential to fully participate in ways that read as natural in that culture. However, relatively little research has examined the extent to which L2 learners are able to enact culturally embedded norms in L2 interaction. Furthermore, little attention has been paid to explaining the cultural theme of omoiyari as it is enacted in an invitation role-play provides …

Post-Fire Erosion And Debris Flows In The Western Pacific Northwest, United States: Recent Science And Opportunities, Sara A. Wall, Kevan Moffett, Annette Patton, Ben Leshchinsky, Andrew C. Wilcox, Maryn Sanders, Heejun Chang, Josh Roering

Geography Faculty Publications and Presentations

Most research into post-fire geomorphology has been conducted in regions with frequent fire, such as in dry Mediterranean and temperate climates and less has been conducted in wet forests where wildfire is now expanding with climate change. Because climate, soils, topography, vegetation, management legacies and fire history influence post-fire geomorphic processes, research into post-fire erosion and debris flow hazards across a broader set of climatologies is needed. The western Pacific Northwest (wPNW) of the United States is susceptible to multiple types of post-fire debris flows (i.e. shallow landslide-initiated and runoff-generated) that can be initiated by longer-duration lower-intensity rainfall compared to …

Research Priorities For Robust Climate Assessments In The United States, Melissa A. Kenney, Robert E. Kopp, Constantine Samaras, Marina Alberti, Sonia Y. Angell, Jennifer Burney, Colin Cunliff, Elliott T. Gall, J. T. Duffy-Anderson, Multiple Additional Authors

Mechanical and Materials Engineering Faculty Publications and Presentations

Scientific assessments play a critical role in synthesizing evidence to support evidence-based decision-making in many sectors and topics. For climate change, large-scale assessments like the Intergovernmental Panel on Climate Change (IPCC) and the United States (U.S.) National Climate Assessment (NCA) reports help many different users—from national government to local governments, Indigenous Peoples and communities, the private sector, the social sector, and the scientific community itself—navigate the complex field of climate risks, impacts, and integrated solutions. While co-creation with users is essential to developing actionable assessments, this paper lays the groundwork for future processes by identifying many advancing and emerging areas …

Legal Geographies Of The Public Trust Doctrine, Alida Cantor, John P. Casellas Connors, Elizabeth Carlino

Geography Faculty Publications and Presentations

The Public Trust Doctrine (PTD) is a legal principle that recognizes a duty of the government to hold certain natural resources in trust for public benefit. The doctrine has been extended within the United States to address issues of water, coastal access, wildlife conservation, and climate change. Its implementation is spatially uneven and subjective, however, raising geographic questions around scale, power, and political economy. This article uses a legal geographic approach to understand the PTD. Focusing on water, wildlife, and atmospheric resources, we analyze themes of scale and jurisdiction, property and commons, and legal and environmental subjectivity. We argue that …

The Cross-Section Of Empirical Evidence And Personal Experience: A Deeper Look At School Resource Officers Through The Lens Of Demarcus A. Jenkins' Research On The Public Opinion Of Their Potential Removal From Public Schools, Quin Armstrong

University Honors Theses

Following the 2020 Black Lives Matter and Anti-Police movements, there were many discussions across the nation about possible changes to law enforcement operations. Among these discussions included specific discussions about what to do about law enforcement officers stationed in schools. These law enforcement officers are known as school resource officers, or SROs.

The focus of this thesis is specifically on Portland, Oregon's Portland Public School (PPS) district's decision to sever ties with the Portland Police Bureau, and what may have contributed to that ultimate decision. This is accomplished through an analysis of a research paper written by fellow Criminal Justice …

Bryophyte Community Composition In A Second-Order Tropical Stream At The Luquillo Experimental Forest, Puerto Rico, Cecilia Sahnow, Jean P. González-Crespo, Amelia Merced

Biology Faculty Publications and Presentations

Streams are important ecosystems that harbor a high diversity of plant species including bryophytes. Studies suggest streams can function as refugia and/or corridors that buffer against the effects of disturbances. In this study, we sampled five sites along a second-order tropical stream in the Luquillo Experimental Forest. We described the riparian bryophyte community composition in conjunction with the physical structure of the stream to understand what environmental factors influence bryophyte composition in the stream. We identified 56 bryophytes, 33 liverworts and 23 mosses; and we recorded cyanobacteria associated with over half of the species of bryophytes. Rocks were the most …

Insurance: A Hidden Tool In The Fire Adapted Community Toolbox?, Michael Patrick Wilshire

Dissertations and Theses

Increased costs associated with wildfire activity in the Western United States has raised concern about the long term stability of homeowners insurance. One popular approach to reducing the risk of catastrophic wildfire is the completion of Firewise behaviors on residential properties. I explored homeowner experiences with homeowners insurance, and asked if rising insurance premiums and policy non-renewals are affecting homeowners' Firewise behaviors. I surveyed homeowners living in the Wildland Urban Interface (WUI) in Deschutes County, Oregon to understand their experiences with homeowners insurance, past Firewise actions, and intentions to complete Firewise actions in the near future. Most homeowners surveyed have …

Evolution Of Global Sea‐Level Rise Projections And Their Uncertainty, Andra J. Garner, Amy Appollina, Jessica Slotter, Gregory G. Garner, Aimée B. A. Slangen, Robert E. Kopp, Benjamin P. Horton

School of Earth, Environment, and Society Faculty Publications and Presentations

For more than 40 years, scientists have projected future sea‐level change. Documenting how sea‐level projections have evolved is vital for tracking progress, uncertainties, and future research needs. Here, we update and analyze a database of global‐mean sea level (GMSL) projections dating from 1982 to 2025, identifying five key findings. First, GMSL projection generation has been concentrated in a small number of developed countries, with 95% of projections produced in the United States, United Kingdom, European Union, or Australia. Second, while GMSL projections for 2050 and 2100 have been published regularly since the early 1980s, only 30 of 103 studies have …

Oregon State Rank Assessment For Schweinitz's Cyperus (Cyperus Schweinitzii), Nora Dunkirk

Institute for Natural Resources Publications

Oregon state conservation status assessment for Schweinitz's cyperus (Cyperus schweinitzii) using NatureServe methodology, 2026.

Credence Goods In Markets With Collective Reputation: Nature Of Equilibria And The Value Of Certification, Erin Krupka, Thomas P. Lyon, Arnab Mitra

Economics Faculty Publications and Presentations

Fraud can cause markets for credence goods to collapse, but collective reputation has been suggested as a potential solution, especially when buyer valuations for quality are high. We develop a discrete model of a market for label credence goods and provide conditions for no-fraud equilibria based on collective reputation. We identify conditions under which all equilibria may be asymmetric or involve mixed strategies and hence sellers may face coordination problems. Our analysis suggests such coordination problems are the greatest when the size of the high-quality market is approximately half of the overall market (that incorporates both high- and low-quality goods), …

What Can You Say When You Can't Say Everything?, Lori Dorfman, Liana B. Winett, Katherine Schaff, Pamela Mejia

OHSU-PSU School of Public Health Faculty Publications and Presentations

Today's decisions about what and how to communicate about population health occur amid very real fears and expectations of harsh reprisal that have had far-reaching impacts, both for people's health and for the health professions. It is in this context that health researchers must share their findings with the public and policy makers, prevent confusion, and avoid harming groups already facing systemic barriers to health. In every communication context-from research papers to quotes on the nightly news-people must make thoughtful choices about what to say. Communication, therefore, is always an act of selection that requires both a clear purpose and …

Unmanned Aerial Support Program In Portland Police Bureau: A Case Study, Eiryn Renouard

Dissertations and Theses

With the Portland Police Bureau (PPB) adopting drone technology in 2024 as a tactical tool, officers have begun to experience change in the way they approach their roles as they learn to work in conjunction with this new technology. Known as the Unmanned Aerial Support program (UAS), this drone program is embedded into PPB's patrol unit. The recency of the program offers an opportunity to examine how a new program using new technology builds its culture and impacts the perspectives and behaviors of its participating officers. By interviewing officers and conducting field observations of the officers and drones in action, …

Oregon State Rank Assessment For Koehler's Rockcress (Boechera Koehleri), Lindsey K. Wise, Gabriel Campbell

Institute for Natural Resources Publications

Oregon state conservation status assessment for Koehler's rockcress (Boechera koehleri) using NatureServe methodology, 2026.

Spatial Reconstructability Analysis: Information-Theoretic Modeling Of Categorical Raster Data, David Percy

Dissertations and Theses

This research focuses on the application of Reconstructability Analysis (RA), an information-theoretic machine learning (ML) methodology, to categorical spatial data in Geographic Information Systems (GIS). RA was developed in the systems community with applications including classification, prediction, pattern recognition, and decision analysis. RA is implemented in OCCAM (Organizational Complexity Computation and Modeling), a software suite developed at Portland State University that analyzes discrete data in tabular form, with observations in rows and variables in columns. While RA has been successfully applied to a variety of domains, no systematic application to georeferenced raster data arranged in regular grids has been previously …

Shade Tree Democracy: Maintaining Peace In Post-Conflict Societies, Jaafar M. Sh Jama

Dissertations and Theses

Under what conditions does customary law contribute to maintaining peace in post-conflict societies? I study this question in the context of Somalia, a country that has lacked an effective central government since the outbreak of civil war in 1991. I argue that in the wake of civil war, traditional systems of government are capable of facilitating peace whereas governance by the modern state apparatus is often an impediment to peace. The underlying mechanisms that I argue explain the effectiveness of a traditional system of governance are that it is 1) in tune with broadly-held societal values, 2) intuitive for citizens …