Digital Commons Network^™

Microbes On The Mountain: Plant-Microbe Associations And Interactions On Mount St. Helens, Emily Rose Wolfe

Dissertations and Theses

Plant-microbe associations and interactions provide critical context to studies in both community and ecosystem ecology, especially in systems that are relatively new and still undergoing early successional processes. Microbes can colonize the surfaces and interiors of all plant tissues, and these assemblages vary in composition both spatially and temporally, even within the same plant. Endophytes are bacteria or fungi that spend most of their lifecycles living within plant tissues asymptomatically--typically, "endophyte" refers specifically to aboveground tissues such as leaves and stems, and therefore may have direct influences on defenses against herbivory, pathogen or pest tolerance, and even afterlife effects on …

A Multiplicity Of Journeys: Stem Education Ecosystems As Sources Of Cultural Sustenance, Christopher Louis Beauprey Cardiel

Dissertations and Theses

In this document, I outline the context and significance of a research problem faced by both formal and informal science, technology, engineering, and math (STEM) educators in the Portland metro area--specifically, the need for greater understanding of the individual and cultural motivations, needs, and agentic behavior of learners, as well as the ways in which these factors intersect with learners' experiences of cultural sustenance within their holistic STEM education ecosystems. I base the significance of this problem on the racial and gender inequities evident in the STEM fields and the social and cultural dynamics that discourage members of these groups …

Proximal Policy Optimization For Radiation Source Search, Philippe Erol Proctor

Dissertations and Theses

Rapid localization and search for lost nuclear sources in a given area of interest is an important task for the safety of society and the reduction of human harm. Detection, localization and identification are based upon the measured gamma radiation spectrum from a radiation detector. The nonlinear relationship of electromagnetic wave propagation paired with the probabilistic nature of gamma ray emission and background radiation from the environment leads to ambiguity in the estimation of a source's location. In the case of a single mobile detector, there are numerous challenges to overcome such as weak source activity, multiple sources, or the …

Experiences Of Undergraduates And Graduate Teaching Assistants In Biology Course-Based Undergraduate Research Experiences, Emma Crystal Goodwin

Dissertations and Theses

Evidence of positive student outcomes from course-based undergraduate research experiences (CUREs) has sparked implementation of CUREs in introductory biology laboratory courses, as one approach to boosting student engagement in research. In a CURE, students collaborate with other students and instructors on a research project, where they conduct novel scientific research that has relevance to a local or scientific community. However, previous research rarely considers that graduate teaching assistants (GTAs) often teach introductory labs. The classroom role of GTAs expands in a CURE--they no longer need to simply teach a lab class, but also to serve as research mentors. GTAs, who …

Information Security Maturity Model For Healthcare Organizations In The United States, Bridget Joan Barnes Page

Dissertations and Theses

This research provides a maturity model for information security for healthcare organizations in the United States. Healthcare organizations are faced with increasing threats to the security of their information systems. The maturity model identifies specific performance metrics, with relative importance measures, that can be used to enhance information security at healthcare organizations allowing them to focus scarce resources on mitigating the most important information security threat vectors. This generalizable, hierarchical decision model uses both qualitative and quantitative metrics based on objective goals. This model may be used as a baseline by which to measure individual organizational performance, to measure performance …

Mechanisms Of Connexin-46 And -50 Intercellular Channel Function And Stability By Molecular Dynamics Simulations, Bassam George Haddad

Dissertations and Theses

Gap junctions make up a class of intercellular channels that characteristically connect the cytoplasm of directly apposed cells through large assemblies, or plaques, constituted by a multitude of intercellular channels. Gap junction mediated intercellular communication is critical for a variety of physiological functions, from coordinating electrical impulses in the heart and brain to maintaining homeostasis in most tissues. There are 21 isoforms of connexins, the constituent subunit of the gap junction, expressed in a tissue dependent manner. Gap junctions formed from different isoforms exhibit distinct biophysical properties, such as gating kinetics and sensitivity, as well as unique permeability and selectivity …

"Like I Was An Actual Researcher": Participation And Identity Trajectories Of Underrepresented Minority And First-Generation Stem Students In Research Training Communities Of Practice, Jennifer Lynn Lindwall

Dissertations and Theses

Although calls for a more diverse workforce in biomedical fields have been widespread, racial and ethnic gaps in biomedical degree attainment remain. Contextualist perspectives seek to understand persistent STEM inequities by examining person-in-context experiences and how systemic factors filter into students' proximal contexts shaping their participation and science identity trajectories. Research training communities of practice aim to offer underrepresented minority and first-generation students support, guidance, and opportunities to learn the practices of science and construct their science identity. However, many students still choose to leave these programs. There is limited research on these students' science identity construction process and their …

Opportunities And Challenges In The Collection And Use Of Socio-Spatial Data In National Forest Planning, Diane Trechsel Besser

Dissertations and Theses

Understanding human-environment connections to places is an important component of land-use management. Tools for collecting geographically referenced public values-based data (defined as socio-spatial data) for use in natural resource planning have been reported in academic journals for decades. The utility of socio-spatial data is in making public values tangible and potentially actionable in land-use analyses and decision processes. However, there is a lack of comprehensive documentation on the ways in which socio-spatial data is perceived, collected, interpreted and applied at a practical level. A better understanding of these factors allows planners to mitigate barriers and leverage opportunities to more …

The Functions Of Panels (Koma) In Manga: An Essay By Natsume Fusanosuke, Jon Holt, Teppei Fukuda

World Languages and Literatures Faculty Publications and Presentations

Natsume Fusanosuke presents in this essay the core ideas of his formal ‘theory of expression’ (manga hyōgen-ron) that focuses on three basic elements of manga: words, pictures, and frames. In the 1990s, Natsume emerged as a seminal scholar of Manga Studies, whose influential works include Manga no yomikata (coauthored, 1995) and Manga wa naze omoshiroi no ka: sono hyōgen to bunpō (1997), where the present essay is found. Here, Natsume describes the central aspects of panel constructions in manga: creating a sense of order for the reader by segmenting time; shaping the reader’s mental perceptions by panel compression (asshuku) and …

Green Waves, Machine Learning, And Predictive Analytics: Making Streets Better For People On Bikes, Stephen Fickas

TREC Final Reports

This project focuses on giving bicyclists a safer and more efficient path through a city’s signalized intersections. It builds on a prior NITC project that tested an app for a fixed-time corridor. The goal of this project is to lay the groundwork for extending this earlier app to include actuated signals. Two machine-learning algorithms are introduced that have a good track record with time-series forecasting: LSTM and 1D CNN. The algorithms are tested on data captured from a busy bike corridor on the south end of the University of Oregon campus. A specific actuated intersection is identified on this corridor …

Teacher Preparation In The Shadow Of Loss: The Blurring Of Transacting, Transforming, And Transgressing, Anita L. Bright

Curriculum and Instruction Faculty Publications and Presentations

In this narrative, autoethnographic piece, the author contends with the constructs of transactional, transformational, and transgressive forms of educational engagement and teaching, all coming to the fore in a time of tremendous sorrow, loss, stress, and transition. Looking to critical scholars and their works for guidance, the author describes the path into and through a course with teacher candidates, taken on mid-term after the unexpected death of a close colleague.

Distressed And Distracted By Covid-19 During High-Stakes Virtual Interviews: The Role Of Job Interview Anxiety On Performance And Reactions, Julie M. Mccarthy, Donald M. Truxillo, Talya N. Bauer, Berrin Erdogan, Yiduo Shao, Mo Wang, Joshua Liff, Cari Gardner

Business Faculty Publications and Presentations

Employers have increasingly turned to virtual interviews to facilitate online, socially distanced selection processes in the face of the COVID-19 pandemic. However, there is little understanding about the experience of job candidates in these virtual interview contexts. We draw from Event System Theory (Morgeson et al., 2015) to advance and test a conceptual model that focuses on a high-stress, high-stakes setting and integrates literatures on workplace stress with literatures on applicant reactions. We predict that when applicants ruminate about COVID-19 during an interview and have higher levels of COVID-19 exhaustion, they will have higher levels of anxiety during virtual interviews, …

Unboxing The Algorithm: A Process Model Of An Algorithmic Solution, Marta Stelmaszak Rosa

Business Faculty Publications and Presentations

With the explosion of data, analytics and artificial intelligence, information systems research focuses on the use, management and consequences of algorithms. This far, only a handful of papers offer insights into how algorithmic solutions work. To address this gap, we studied the code making up 45 public data science Jupyter notebooks containing algorithmic solutions developed to predict customer churn in a credit card dataset on a data science platform Kaggle. com. We synthesized a process model of an algorithmic solution: preparing the environment, reading in data, cleaning data, exploratory data analysis, pre-processing the dataset, building and training the model, and …

Participatory Gis Mapping Highlights Indirect Use And Existence Values Of Coastal Resources And Marine Conservation Areas, Kaegan M. Scully‐Engelmeyer, Elise F. Granek, Max Nielsen-Pincus, Greg Brown

Environmental Science and Management Faculty Publications and Presentations

Consideration of social and cultural dimensions in coastal and marine planning has increased and ecosystem services provide important framing to investigate values and priorities associated with these systems. Research efforts in coastal communities offer insights on social dimensions of ocean and coastal management decisions, but questions remain about how demographics and geographic residence affect perceptions of marine resources and management. We conducted and analyzed a public participation geographic information system (PPGIS) mapping survey of Oregon residents to capture uses and perceived values of coastal and marine areas. We measured coastal values, explored regional differences in those values, and identified a …

Raps Sheet, Summer 2021, Retirement Association Of Portland State

RAPS Sheet: Monthly Newsletter

No abstract provided.

Educational Outcomes Of Gender Diverse Youth: A National Population-Based Study, Lindsey Wilkinson, Dara Shifrer, Jennifer Pearson

Sociology Faculty Publications and Presentations

Despite the growing population of youth identifying with a transgender or nonbinary gender identity, research on gender diverse individuals’ educational outcomes is limited. This study takes advantage of the first nationally representative, population-based data set that includes measures of gender identity and educational outcomes: the High School Longitudinal Study of 2009. Using minority stress and structural symbolic interactionist frameworks, we examine the association between gender identity and high school and college educational outcomes. We compare educational outcomes of gender diverse youth—binary transgender, nonbinary, and gender unsure—to cisgender youth, and also examine differences within the gender diverse population. Given the strong …

Data-Driven Mobility Strategies For Multimodal Transportation, Yao-Jan Wu, Xianfeng Terry Yang, Sirisha Kothuri, Abolfazl Karimpour, Qinzheng Wang, Jason Anderson

TREC Final Reports

Multimodal transportation systems (e.g., walking, cycling, automobile, public transit, etc.) are effective in increasing people’s travel flexibility, reducing congestion, and improving safety. Therefore, it is critical to understand what factors would affect people’s mode choices. With advanced technology, such as connected and automated vehicles, cities are now facing a transition from traditional urban planning to developing smart cities. To support multimodal transportation management, this study will serve as a bridge to connect speed management strategies of conventional corridors to connected vehicle corridors. This study consists of three main components. In the first component, the impact of speed management strategies along …

Mopping Up Or Turning Off The Tap? Environmental Injustice And The Ethics Of Plastic Pollution, Katharine A. Owens, Katie Conlon

Urban Studies and Planning Faculty Publications and Presentations

Opinion article

Decades of scientific research confirm that plastic pollution poses a threat to many species, to water resources, and to economies around the world (Laist, 1997; Barnes et al., 2009; Gregory, 2009; Teuten et al., 2009; Chen, 2015; Newman et al., 2015; Rochman, 2015). Experts demonstrate that oceanic plastic pollution is increasing at astounding rates (Eriksen et al., 2014; Geyer et al., 2017). Research indicates harmful levels of toxicity in everyday plastic items (SCP/RAC, 2020). Scientists find this issue so important that they have recommended plastics …

Marine Debris And Human Health: An Exposure Pathway Of Pops?, Katie Conlon

Urban Studies and Planning Faculty Publications and Presentations

Although there are not any direct studies linking persistent organic pollutants (POPs) accumulated on marine debris to human health, there are numerous studies showing human health impacts from repeated and high level POP exposure, as well as studies that show POPs accumulate on plastic debris in the marine environment. With this knowledge, there is a need for greater awareness of the risks of POP exposure for those who handle marine debris regularly, especially in contexts of higher exposure such as those working in marine debris concentrated areas. Amongst the scientific community, understanding of the exposure risk might be high, but …

Using Deep Learning Algorithms To Give Bicyclists The “Green Wave” At Traffic Signals, Stephen Fickas

TREC Project Briefs

Led by Dr. Stephen Fickas of the University of Oregon (UO), transportation researchers are working to give bicyclists smoother rides by allowing them to communicate with traffic signals via a mobile app.

Chinese Herbal Medicine To Reduce Radiation-Induced Oral Mucositis In Head And Neck Cancer Patients: Evidence From Population-Based Health Claims, Hsin-Hua Li, Hanoch Livneh, Wei-Jen Chen, Ming-Chi Lu, Wen-Yen Chiou, Shih-Kai Hung, Chia-Chou Yeh, Tzung-Yi Tsai

Counselor Education Faculty Publications and Presentations

Background: Subjects with head and neck cancer (HNC) often experience post-treatment side effects, particularly radiation-induced oral mucositis (RIOM). This study aimed to explore the association of Chinese herbal medicine use with the sequent risk of RIOM among them.

Methods: This cohort study used a nationwide health insurance database to identify subjects newly diagnosed with HNC, aged 20 to 60 years, who received treatment between 2000 and 2007. Among them, a total of 561 cases received CHM after HNC onset (CHM users); the remaining 2395 cases were non-CHM users. All patients were followed to the end of 2012 to …

Data Files: Green Waves, Machine Learning, And Predictive Analytics: Making Streets Better For People On Bikes, Stephen Fickas

TREC Datasets and Databases

The project builds on a prior app that was designed for Green Light Optimized Speed Advisory (GLOSA). This is more colloquially known as keeping a vehicle in the green wave: you are at a location and moving at a speed that will allow you to (theoretically) have a green light at each intersection you encounter along a corridor. Our long-term goal is to extend the FastTrack app described in the Background section to include actuated signals along a corridor. This project takes a first step by evaluating the effectiveness of machine-learning algorithms to predict the next phase of an actuated …

Microscopic Object Classification Through Passive Motion Observations With Holographic Microscopy, Christian Lindensmith, Jay Nadeau, Manuel Bedrossian, Louis Sumrall, J. Kent Wallace, Eugene Serabyn

Physics Faculty Publications and Presentations

Digital holographic microscopy provides the ability to observe throughout a volume that is large compared to its resolution element without the need to refocus through the volume. This capability enables simultaneous observations of large numbers of small objects within such a volume. We have constructed a microscope that can observe a volume 0.4 x 0.4 x 1.0 μm with submicrometer resolution for observation of microorganisms and minerals in liquid environments in earth and on potential planetary missions. Because environmental samples are likely to contain mixtures of inorganics and microorganisms that are of comparable sizes near the resolution limit of the …

Linear Nearest Neighbor Flocks With All Distinct Agents, R. G. Lyons, J. J. P. Veerman

Mathematics and Statistics Faculty Publications and Presentations

This paper analyzes the global dynamics of one-dimensional agent arrays with nearest neighbor linear couplings. The equations of motion are second-order linear ODE’s with constant coefficients. The novel part of this research is that the couplings are different for each distinct agent. We allow the forces to depend on the positions and velocity (damping terms) but the magnitudes of both the position and velocity couplings are different for each agent. We, also, do not assume that the forces are “Newtonian” (i.e. the force due to A on B equals the minus the force of B on A) as this assumption …

Lidar Predictive Modeling Of Pacific Northwest Mound Sites: A Study Of Willamette Valley Kalapuya Mounds, Oregon (Usa), Tia Rachelle Cody, Shelby Anderson

Anthropology Faculty Publications and Presentations

Archaeologists need new methods to survey large areas and overcome environmental and archaeological barriers to site discovery in heavily forested regions. LiDAR (light detection and ranging) technology is one possible solution to these challenges as LiDAR digitally clears away vegetation, facilitating large-scale remote sensing survey. The Calapooia Watershed, located in the southern Willamette Valley of Oregon, is an ideal area to utilize LiDAR. While valley lowlands are cleared for agriculture, riverine areas remain heavily wooded and are known to contain hundreds of low-lying earthwork features created by pre-colonial Kalapuyan people. To assess the potential application of LiDAR in this region, …

Affecting Absenteeism Through School-Based Health Services Delivery: A Configurational Comparative Methods Study Of Oregon's Public Secondary Schools, Kelly Elizabeth Coates

Dissertations and Theses

A student's ability to attend school regularly can be profoundly affected by poor health-related behaviors, illnesses, and chronic diseases that are left unaddressed and unattended. The delivery of health services in the school environment is uniquely positioned to interrupt the effects these health barriers to learning (HBLs) can have on subsequent diminished educational and health outcomes. The literature widely acknowledges the intersectionality between health and education, but no comprehensive overview exists of how different structures and processes within a school work (or do not work) together to lead to higher or lower student absenteeism. This research sought to fill that …

An "I" For An "I": A Systematic Review And Meta-Analysis Of Instigated And Reciprocal Incivility, Lauren S. Park, Larry R. Martinez

Psychology Faculty Publications and Presentations

Incivility and its negative impacts on individuals, teams, and organizations have been widely studied in workplace contexts, but the literature lacks a comprehensive understanding of incivility from the instigator's perspective. This meta-analysis of instigated incivility included 35,344 workers from 76 independent samples. Results showed that instigated incivility was related to several correlates including psychological ill-being, ρ = .36, and well-being, ρ = -.17; physical well-being, ρ = -.25; personal dispositions that are risk factors, ρ = .47, and preventative factors, ρ = -.34; negative, ρ = .28, and positive, ρ = -.33, job attitudes; positive team characteristics, ρ = -.28; …

"What Keeps Me Awake At Night": Assisted Living Administrator Responses To Covid-19., Jason Z. Kyler-Yano, Ozcan Tunalilar, Serena B. Hasworth, Jacklyn N. Kohon, Jaclyn M. Winfree, Riley A. Wilton, Aliza Tuttle, Paula C. Carder

Institute on Aging Publications

Assisted living (AL) constitutes an important sector of residential long-term care, yet there has been limited research about the impact of the coronavirus disease 2019 (COVID-19) pandemic in this setting. This qualitative study sought to understand the impact of the early stages of the pandemic (February-August 2020) from AL administrators' perspectives.

Does Experiencing Spousal Support And Strain Impact The Quality Of Family-Based Support That Supervisors Provide To Employees?, Joseph Alvin Sherwood

Dissertations and Theses

Relying on previously collected data from the Work, Family and Health Study (WFHS), and drawing from a sample of 75 supervisors working in the extended healthcare industry, this research investigation empirically tested propositions of the Work-Home Resources Model to explore antecedents of family-supportive supervisor behaviors (FSSB). To explore these relationships a longitudinal, multi-level structural equation model (MSEM) was used to examine how supervisor contextual resources (spousal support) and demands (spousal strain) in the home domain impacted employee perceptions of these supervisors' FSSB through gains in personal resources (psychological distress) across three time points. Results from the MSEM model confirmed one …

Exploring Linkages Between Landscape Patterns And Freshwater And Estuarine Bivalves In The Coast Range Of Oregon, Kaegan Michael Scully-Engelmeyer

Dissertations and Theses

Spatial configurations of landscape variables (biotic, abiotic, and socio-ecological) affect and are affected by ecological processes and species in watersheds. This dissertation explores relationships among landscape patterns, ecosystem processes and bivalve species dynamics in coastal watersheds in Oregon, USA. I approached this broad topic through two primary avenues of research: investigating cross-ecosystem threats from pesticide use in forestland management to downstream aquatic environments, and the landscape ecology of an at-risk freshwater mussel species.

Terrestrial land use activities present cross-ecosystem threats to riverine and marine species and processes. Specifically, pesticide runoff can disrupt hormonal, reproductive, and developmental processes in aquatic organisms, …