Digital Commons Network^™

The Addition Of Chinese Herbal Medicines Is Effective As A Prophylactic Treatment Against Dental Diseases For Sjögren’S Syndrome Patients: Insight From Real-World Database, Ching-Ya Juan, Wei-Jen Chen, Hanoch Livneh, Ming-Chi Lu, Tzung-Yi Tsai

Leadership, Learning and Counseling Faculty Publications and Presentations

Background and Objectives:

Sjögren’s syndrome (SS) is a chronic autoimmune disease that affects the salivary glands and increases the risk of developing dental diseases (DDs). Chinese herbal medicines (CHMs) represent a promising alternative strategy for SS treatment; however, the association between CHMs and DD risk has not been confirmed. In this retrospective, cohort-based, nested case-control study, we explored whether or not combining CHMs with routine treatments for SS can reduce the chance of DDs.

Materials and Methods:

In the beginning, we recruited subjects aged 20–80 years with newly diagnosed SS who were free of DDs between 2001 and …

Probabilistic Intervals Around Population Forecasts: A New Approach With A Subnational Example Using Washington State Counties, David A. Swanson, Jeff Tayman

Publications, Reports and Presentations

Population forecasts produced by governments at all levels are used in the public sector, the private sector, and by researchers. They have been primarily produced using deterministic methods. This paper shows how a method for producing measures of uncertainty can be applied to existing subnational population forecasts while meeting several important criteria, including the concept of utility. The paper includes an assessment of the efficacy of the method by: (1) examining the change in uncertainty intervals it produces by population size and population growth rate; and (2) comparing the width and temporal change of the uncertainty intervals it produces to …

Seismic Fragility Analysis Of Above-Ground Liquid Storage Tanks, Pooyan Khajeh Shahzanian

Dissertations and Theses

Liquid storage tanks are critical infrastructure, serving as key storage facilities for various products. As the contents in these tanks are usually highly toxic and flammable, damage to these structures under earthquakes can cause severe consequences, including energy shortage, fire and explosion, and spilling and long-term environmental damages.

Although new liquid storage tanks are designed according to the updated seismic design codes, large numbers of existing storage tanks were built before modern seismic design codes and did not undergo necessary seismic retrofitting. Observations and reports from past earthquakes demonstrate that these older tanks can be highly vulnerable to seismic excitation. …

Exploring Underrepresented Stem Undergraduates' Stem Identity Development: The Role Of Social Partners, Sandy Cerda-Lezama

Dissertations and Theses

This dissertation employs a three-study qualitative design to investigate the role of mentorship and social interaction in the identity development of racial minority undergraduate students in STEM disciplines. Grounded in Communities of Practice theory, this research amplifies student narratives to elucidate the relational and contextual factors that inform science identity, belonging, competence, and persistence in higher education. Study One draws upon interview data from fifteen participants in the BUILD program to analyze the role of recognition, particularly from expert scientists--in students' science identity development. This study aims to understand how racial and ethnic identity intersections influence the processes and impact …

Arbuscular Mycorrhizal Fungi As Key Drivers Of Plant Resilience: Mechanisms Of Stress Adaptation In Saline Environments, Rayna Elizabeth Koberstein

Dissertations and Theses

Arbuscular mycorrhizal fungi (AMF) play a critical role in mediating plant responses to environmental stress, yet their ecological significance in saline wetland restoration remains underexplored. This greenhouse experiment investigated the effects of salinity, root-zone barrier type (solid, mesh, none), and neighboring species identity on AMF colonization and physiological responses in three native estuarine plants: Carex densa, Juncus patens, and Scirpus microcarpus. Results demonstrated species-specific physiological responses to salinity, with Juncus patens showing greater resilience in maintaining photosynthetic efficiency (Fv/Fm) and percent cover at higher salinity levels, while Scirpus microcarpus exhibited a significant decline. Mesh barriers, which permitted …

(De)Centralized Water Futures: Key Dimensions Of Infrastructure, Governance, And Operations, Alicia Dailey Cooperman, Jenny Linder Rempel, Ellis Adjei Adams, Alida Cantor, Manuela Muñoz Fuerte, Jeremiah Osborne-Gowey, Nicole J. Wilson, Cassandra L. Workman, Melissa Beresford, Leila M. Harris, Multiple Additional Authors

Geography Faculty Publications and Presentations

Water system centralization and decentralization have variously been promoted as key to achieving household water security and Sustainable Development Goal 6.1. We argue that the lack of specificity with which scholars and practitioners use the terms centralization and decentralization limits our understanding of different water system configurations and their impacts. In this Primer, we provide a framework for thinking about levels of (de)centralization across three linked system dimensions: infrastructure, governance, and operations and maintenance. We encourage those analyzing water systems to characterize (de)centralization with respect to these multiple dimensions, as well as the system's broader political-economic and hydro-climatic contexts. Emphasizing …

Development Of A Water Temperature Modeling Platform To Support Short- And Long-Term Water Temperature Management In Reservoir-River Systems, Michael Deas, Yung-Hsin Sun, John Degeorge, Benjamin T. Saenz, Thomas A. Evans, Scott Burdick-Yahya, Stephen Andrews, Jeff Schuyler, William Candy, Lin Zheng, Scott Wells, Multiple Additional Authors

Civil and Environmental Engineering Faculty Publications and Presentations

The U.S. Department of the Interior, Bureau of Reclamation (Reclamation) supports water temperature management for fishery species protection in downstream river reaches below Central Valley Project (CVP) reservoirs in the Sacramento, American, and Stanislaus River systems. The Water Temperature Modeling Platform (WTMP) Project was initiated to modernize and enhance modeling capabilities to predict summer–fall water temperature through reservoir cold water pool management using temperature control facilities designed for temperature management. The WTMP supports forecasts, historical analyses, and long-term planning efforts and advances previous modeling approaches by using an integrated modeling platform. This platform includes a data management system that acquires …

Reining In Plasticulture From Land To Sea: Pacific Northwest (Usa) Perspectives On Agriculture And Aquaculture, Susanne M. Brander, Gail A. Langellotto, Minal T. Mistry, Sebastian L. Singleton, Mackenna A. Hainey, Lauren M. Kashiwabara, Kelsey Arthur, Elise F. Granek, Kervelle Baird, Ricardo Palazuelos, Multiple Additional Authors

Environmental Science and Management Faculty Publications and Presentations

Plastic use in food production—known as plasticulture—has transformed agriculture and aquaculture globally. Plasticulture gained momentum in the mid-20th century with the development of novel plastic materials, and by 2009, U.S. farmers used over 200 million pounds of plastic films annually. Though plastics have increased yields and efficiency, they now pose environmental hazards through the release of microplastics (MPs) and chemicals. Despite extensive documentation of MPs in the environment, their role in U.S. food production and impacts on crop, livestock, and aquaculture health remain underexplored. In regions like the Pacific Northwest (PNW), with robust agricultural and aquaculture sectors, plastics from films, …

Enhancement Of Spin Transport Properties In Angled-Channel Graphene Spin Valves Via Hybrid Spin Drift-Diffusion, Samuel Olson, Kaleb Hood, Otto Zietz, Jun Jiao

Mechanical and Materials Engineering Faculty Publications and Presentations

Graphene has promise as a channel connecting separate units of large-scale spintronic circuits owing to its outstanding theoretical spin transport properties. However, spin transport properties of experimental devices consistently fall short of theoretical estimates due to impacts from the substrate, electrodes, or defects in the graphene itself. In this study, we fabricate both traditional non-local spin valves (NLSVs) and novel hybrid drift-diffusion spin valves (HDDSVs) to explore the impact of charge current and AC spin injection efficiency on spin transport. HDDSVs feature channel branches that allow investigation of charge-based spin drift enhancement compared to diffusion-only configurations. We investigate the modulation …

From Model To Behavior: Methodological Challenges In Using Fuzzy Cognitive Maps To Represent Mental Models, Catherine Elizabeth Moore

Dissertations and Theses

This dissertation examines the use of Fuzzy cognitive maps (FCMs) as representations of mental models and how these representations connect to individual behavior. Fuzzy cognitive maps (FCMs) are semi-quantitative models that encode cause-and-effect structures as directed graphs. They are frequently used to represent individuals' knowledge structures/mental models and should in theory correlate to actions and decisions of individuals; however, this correlation has yet to be explored in a systematic manner. This dissertation represents the first step in experimental research on the connection between FCMs and individual behavior. It examines two theories of how humans use mental models, one based on …

Characterizing Secondary Flow Structures Over Scaled Solar Arrays And Investigating Impact Of System Yaw Angle, Katie Nicole Taylor

Dissertations and Theses

This study investigates Prandtl's secondary flows of the second kind within the turbulent boundary layer over a newly defined type of surface roughness, e-type, which is characterized by roughness elements that are elevated from the wall. This e- type roughness is modeled after photovoltaic (PV) solar panels and its study driven by establishing a more robust understanding into how flow moves through solar arrays as the demand for renewable energy continues to grow.

Wind tunnel experiments using particle image velocimetry (PIV) were conducted over a scaled array of panels and explored how shifting the yaw angle of the …

Direct Numerical Simulation Of Unstably Stratified Turbulent Flow Over Riblets, Max Eltzroth

Dissertations and Theses

Riblets are micro-groove elements which can reduce the skin friction drag coefficient for wall-, channel-, and pipe-flows. It is unclear how robust these drag-reduction capabilities are when external forces are acting on the fluid and affecting turbulent structures. Here, buoyancy forces are introduced by varying the wall Richardson number (Riτ = 0, 18, 60) to create unstable stratification. Direct numerical simulations (DNS) are performed on streamwise-aligned riblets of triangular and bladed geometries in a horizontal half-channel pressure-driven turbulent flow (Re_τ = 395). The Fukagata-Iwamoto-Kasagi (FIK) identity is used to decompose how changes in stresses contribute to changes …

Developing Workflows For Passive Acoustic Detection Of Bedload Transport, Quinn Morgan

Dissertations and Theses

Bedload transport is defined as the amount of sediment, including gravel and rocks, traveling down stream. Monitoring bedload transport is important for river safety, hydrological studies and conservation efforts. Existing methods of directly measuring bedload transport (or bedload flux) involve lowering a collection device into a river and measuring the sediment collected; which can be expensive and time consuming. Hydroacoustic sensors, such as hydrophones, have had success tracking bedload flux remotely. This works by measuring the relatively high frequency of sediment impacts to map onto total bedload transported. No perfected method for detection of sediment generated noise (SGN) currently exists. …

Barriers Beyond Bars: Examining Experiences Of Students With Criminal Records, Anakin Rivera Ramirez

Dissertations and Theses

As educational opportunities, particularly prison education programs, continue to expand for incarcerated individuals, this study, which included two participants, one formerly incarcerated and one who pleaded guilty to avoid incarceration, suggests that those who plead guilty to avoid prison may enter college without the structured reintegration resources available to their incarcerated peers. While substantial research has explored the school-to-prison pipeline phenomenon in K-12 settings, fewer studies have examined its impact on students with criminal records navigating higher education. Grounded in Critical Race Theory (CRT) in education, this study seeks to understand the experiences of carceral system-impacted students of color in …

Evaluation Of User Interactions And Preferences Of Shared Bicycle And Pedestrian Transit Platforms, Nathan Mcneil, Sirisha Kothuri, Jennifer Dill, Chris Monsere, Elizabeth Yates, Julia Plotts

Civil and Environmental Engineering Faculty Publications and Presentations

Shared bike and bus platforms have been deployed in an effort to minimize conflicts between bicycles and buses (and other motor vehicles) on streets with bike lanes and bus transit service. This paper assesses bicycle/micromobility user and pedestrian behavior in shared bicycle and transit platforms along a bus rapid transit corridor in Portland, OR. Research objectives include understanding interactions between these users and potential conflicts between people on foot (or wheelchair/mobility devices) who are waiting for, boarding, and/or alighting a bus and people on bicycles riding in the bike lane. The research also assessed how well the shared transit platforms …

Fathers' Racial Differences In Perceived Workplace-Induced Stereotype Threat: Impacts On Sense Of Belonging, Job Satisfaction, And Turnover, Frances Evalyne Kealiimahiaiokalani Hampton

Dissertations and Theses

Black fathers (BFs) face unique workplace challenges due to racialized and gendered stereotypes that undermine their legitimacy as men, workers, and parents. Drawing on Stereotype Threat Theory (STT) and Stereotype Embodiment Theory (SET), this study examined how workplace-induced stereotype threat (WIST) affects BFs' job attitudes and turnover intentions (TIs). I hypothesized that BFs would report higher WIST than White fathers (WFs), and that WIST would mediate the effects of race-related perceptions on job satisfaction (JS), sense of belonging (SOB), and TIs. In addition, perceived organizational support (POS) was tested as a moderator on the relationships between WIST and these job-related …

Clinic Vs. Daily Life Gait Characteristics In Patients With Spinocerebellar Ataxia, Vrutangkumar V. Shah, Daniel Muzyka, Adam Jagodinsky, Hannah Casey, James Mcnames, Mahmoud El-Gohary, Kristen Sowalsky, Delaram Safarpour, Patricia Carlson-Kuhta, Fay B. Horak, Christopher M. Gomez

Electrical and Computer Engineering Faculty Publications and Presentations

Background:

Recent findings suggest that a single gait assessment in a clinic may not reflect everyday mobility.ObjectiveWe compared gait measures that best differentiated individuals with spinocerebellar ataxia (SCA) from age-matched healthy controls (HC) during a supervised gait test in the clinic vs. a week of unsupervised gait during daily life.

Methods: Twenty-six individuals with SCA types 1, 2, 3, and 6, and 13 (HC) wore three Opal inertial sensors (on both feet and lower back) during a 2-minute walk in the clinic and for seven days in daily life. Seventeen gait measures were analyzed to investigate the group differences using …

Proceedings Of The 33rd United States – Japan Bridge Engineering Workshop, David Y. Yang

Civil and Environmental Engineering Faculty Publications and Presentations

This report summarizes the 33rd United States–Japan Bridge Engineering Workshop, an event that convenes bridge engineers from both countries. The workshop serves as a platform to exchange innovative ideas and technologies, as well as to share crucial knowledge and lessons learned, all with the aim of advancing bridge engineering. The 33rd workshop specifically addressed transportation asset management and seismic retrofitting, two subjects of increasing importance to both the United States and Japan. The report details the workshop's discussions on topics relevant to bridge engineers.

“Migration Craziness!” Financial Turbulence And Transnational Families In Sri Lanka, Michele R. Gamburd

Anthropology Faculty Publications and Presentations

Why might three relatively well-off, middle-class, young adults from Sri Lanka chose to leave their parents and their village to emigrate to Australia and Italy? Why would these men and women give up promising careers and comfortable homes to start over elsewhere and endure the hardship of an immigrant’s deskilled and displaced life? To understand their decisions, I rely on anthropology’s holistic perspective to help me stitch together intimate details about family choices within a context of global economic structures and national politics. I have done ethnographic research in the village that I call “Naeaegama” since 1992. I have studied …

Digital Strategies And Non-Conventional Sources Of Innovation: Analysis Of Causal Relationships Using Interpretive Structural Modeling, Ines M. Ferinha, Fernando A. F. Ferreira, Neuza C. M. Q. F. Ferreira, Edwin Garces, Tugrul Daim

Engineering and Technology Management Faculty Publications and Presentations

Digitalization appears to have sped up in recent years, and many companies have seen their business models changed irreversibly. In this context, small and medium-sized enterprises (SMEs) should adopt different business approaches that help these firms thrive and maintain and/or create sustainable competitive advantages. SMEs’ specificities can present obstacles to this adaptation process, yet these challenges may turn out to be the greatest allies of these companies if they stimulate swift, quick transformations. This study sought to develop an analysis system that identifies appropriate digital strategies and non-conventional sources of innovation, which can thus promote sustainable SME innovation. To achieve …

Functional Ecology Of Antarctic Flora, Zoie C. Yetley

Dissertations and Theses

Antarctic mosses play foundational roles in terrestrial ecosystem processes, yet their functional ecology remains poorly understood. This study developed a novel functional trait-based framework for dominant moss species across glacier retreat gradients in the South Shetland Islands, addressing a critical gap in Antarctic bryophyte ecology. Nutrient- and water-related traits were measured for four moss species--Polytrichastrum alpinum, Bryum pseudotriquetrum, Sanionia uncinata, and Syntrichia saxicola--along with Deschampsia antarctica, across nine sites spanning early to late successional stages. Results revealed strong interspecific trait differentiation: P. alpinum exhibited conservative nutrient-use and rapid water-uptake strategies; S. uncinata and B. pseudotriquetrum …

The Social And Political Identities Of Latine Republicans In The U.S., Gabriella M. Mota

Dissertations and Theses

Between the 2016 and 2024 presidential elections, support for Republican candidate Donald Trump among Latine voters increased from 29% to 42%. This rise has attracted interest given Trump's nativist rhetoric and policies that target Latine immigrants. Previous literature has examined the growing Republican partisanship among Latine Americans, focusing on the processes of assimilation and the effects of racial ideology on the partisanship of the Latine electorate. Although this research is gaining traction, the political attitudes of Latine Republicans remain understudied. This study explores how Latine Republicans manipulate ethnoracial attachments to justify their support for Donald Trump and the Republican Party. …

Pressure And Force Dynamics In Artificial Muscle Actuators: A State-Space And Optimization-Based Approach, Mohammad Elzein

Dissertations and Theses

This two-part investigation explores the dynamic behavior of braided pneumatic actuators (BPAs) under bio-inspired pulse modulation, with the aim of improving their biomimetic force output and control. The first study examines the effect of pulse length and inter-pulse timing on BPA performance, revealing that force output is highly sensitive to the temporal structure of input pulses mirroring biological muscle behavior. Using dual-pulse actuation schemes, the results demonstrate that force responses exceed the additive contributions of individual pulses, with peak amplification occurring consistently at a 27 ms inter-pulse gap. Shorter pulse lengths (10–20 ms) yielded the highest normalized force increases, up …

Hydrosocial Ocean Commons: Offshore Wind Energy In Oregon, Bryce Ashlyn Sprauer

Dissertations and Theses

The ocean has been culturally and legally conceptualized as a commons, a space of subsistence inherited by all. Enclosure or privatization creates overlapping jurisdictions of ocean space. The ocean is also the world's most significant carbon capture, absorbing billions of tons of anthropogenic carbon dioxide since the Industrial Revolution. Now, the ocean offers an additional opportunity to decarbonize energy production and reduce greenhouse gas emissions through 'new frontiers' of offshore wind technology; however, this potential is entangled within neoliberalism. Offshore wind is entering a fragmented legal landscape where the social-legal process of ocean jurisdiction remains contested. As the "new frontier" …

Free-Running Ring Oscillators For Crystal-Free Communication Systems: Design, Simulation Challenges, And Frequency Stability Improvements, Haziq Rohail

Dissertations and Theses

This thesis presents techniques for enhancing the frequency stability of ring oscillators (ROs) for crystal-free wireless communication systems. The first major contribution is a tutorial-style study of frequency stability metrics, providing clear definitions, conversions methods, and comparative analysis of commonly used figures of merit such as phase noise, Allan deviation, and jitter. The second contribution addresses the challenges of simulating phase noise in free-running ROs. Key techniques including Periodic Steady-State Noise (PNoise), Harmonic Balance Noise (HBNoise), and transient noise analysis are evaluated in terms of accuracy, convergence behavior, and simulation runtime. Based on these results, practical guidelines are offered for …

Projections Of Lightning‐Ignited Wildfire Risk In The Western United States, Dmitri A. Kalashnikov, John T. Abatzoglou, Frances V. Davenport, Zachary M. Labe, Paul C. Loikith, Danielle Touma, Deepti Singh

Geography Faculty Publications and Presentations

Cloud‐to‐ground (CG) lightning is a major source of summer wildfire ignition in the western United States (WUS). However, future projections of lightning are uncertain since lightning is not directly simulated by most global climate models. To address this issue, we use convolutional neural network (CNN)‐based parameterizations of daily June‐September CG lightning. CNN parameterizations of daily CG lightning occurrence at each grid cell use fields of three thermodynamic variables—ratio of surface Moist Static Energy (MSE) to 500 hPa saturation MSE, 700–500 hPa lapse rate, and 500 hPa relative humidity. Applying these parameterizations to the Community Earth System Model version 2 Large …

Transfer Learning-Based Multi-Sensor Approach For Predicting Keyhole Depth In Laser Welding Of 780dp Steel, Byeong-Jin Kim, Young-Min Kim, Cheolhee Kim

Mechanical and Materials Engineering Faculty Publications and Presentations

Penetration depth is a critical factor determining joint strength in butt welding; however, it is difficult to monitor in keyhole-mode laser welding due to the dynamic nature of the keyhole. Recently, optical coherence tomography (OCT) has been introduced for real-time keyhole depth measurement, though accurate results require meticulous calibration. In this study, deep learning-based models were developed to estimate penetration depth in laser welding of 780 dual-phase (DP) steel. The models utilized coaxial weld pool images and spectrometer signals as inputs, with OCT signals serving as the output reference. Both uni-sensor models (based on coaxial pool images) and multi-sensor models …

Capturing Processes Of Influence In Students' Social Interactions: Examining A Two-Part Strategy To Detect Patterns Of Reinforcement In Continuous Real-Time Observations In The Classroom, James Lamar Delaney Iii

Dissertations and Theses

Students' active engagement in learning activities is presumed to be influenced by their interactions with social partners in the classroom setting, like teachers and peers. For instance, statements of support or affirmation from teachers or peer group members are assumed to encourage positive behaviors for struggling students, while statements of disapproval are assumed to discourage and undermine active classroom behaviors. Extant research examining these processes typically tries to demonstrate significant interaction patterns or show influence over time by way of indirect behavioral measures, such as survey-based assessments. It is an open question whether these processes of influence can be directly …

Towards Scalable Schema Mapping Using Large Language Models, Christopher Buss, Mahdis Safari, Arash Termehchy, David Maier, Stefan Lee

Computer Science Faculty Publications and Presentations

The growing need to integrate information from many diverse sources poses significant scalability challenges for data integration systems. These systems often rely on manually written schema mappings, which are complex and costly to maintain. While recent advances suggest that large language models (LLMs) can assist in automating schema mapping, key challenges remain. We motivate future research in schema mapping generation by highlighting key challenges, presenting a competitive bidirectional schema matching pipeline, and exploring the limitations of current methods for generating more complex mappings.

Design And Evaluation Of An Electromagnetic Band Gap Structure For Self-Interference Reduction In Mmwave Full-Duplex Systems, Adewale Kehinde Oladeinde

Dissertations and Theses

Full-duplex (FD) wireless is a new technology that allows a device to transmit and receive at the same time and on the same frequency band. It has the potential to double the capacity and spectral efficiency of a wireless link compared to the family of conventional half-duplex wireless systems. The key challenge in implementing FD wireless communication is self-interference (SI): a node's transmitting signal generates significant interference to its receiver. Several previous studies have demonstrated the potential to reduce SI and develop FD radios; however, these studies are mostly limited to sub-6 GHz systems. Previous and on-going research explored various …