Digital Commons Network^™

The Risc-V Fpga (Rvfpga) Teaching Package, Daniel Chaver, Sarah Harris, Luis Pinuel, Olof Kindgren, Zubair Kakakhel, Chris Owen, Roy Kravitz, Jose I. Gomez-Perez, Fernando Castro, Katzalin Olcoz, Multiple Additional Authors

Electrical and Computer Engineering Faculty Publications and Presentations

RISC-V is a free and open-standard ISA based on RISC principles, allowing anyone to design, manufacture, and sell RISC-V chips and software. Its flexibility and growing ecosystem have made it popular in research, education, and industry, increasing the need for educational materials. This paper provides an in-depth description of the RVfpga course, which offers a solid introduction to computer architecture using the RISC-V instruction set and FPGA technology. It focuses on providing hands-on experience with real-world RISC-V cores, the VeeR EH1 and EL2 cores, developed by Western Digital and hosted by ChipsAlliance. The course targets students and educators in computing-related …

Thinking Otherwise With Children In Cities: A Storying Approach To Co-Researching With Children And Teachers, William A. Parnell, Sally Guyon

Leadership, Learning and Counseling Faculty Publications and Presentations

This Children in Cities research project examines an approach to storying research that foregrounds collaborative meaning-making between educators and young children in their city. Through exploring how educators and young children might “think otherwise” about teaching, learning, and participation with history, Place noticing and entanglements between humans, more-than-human, and non-humans, three stories and a metaphor surface in the data. Drawing on three stories, metaphor is employed as an analytic and integrative device to deepen interpretation of lived experiences. Central to the methodology is a democratic orientation that seeks to reduce hierarchical boundaries, engaging children aged 3–5 as co-researchers in the …

Coexisting Salps Exhibit Distinct Feeding Selectivity On Microorganisms In The North Pacific Subtropical Gyre, Anne W. Thompson, Kylee Lamberson, Kelly R. Sutherland

Biology Faculty Publications and Presentations

Mortality mechanisms play an important role in how oceanic microorganisms contribute to global biogeochemical cycles. Salps are widespread pelagic tunicates known to remove phytoplankton from coastal and high-latitude waters, but their interaction with microorganisms in the vast tropical and subtropical gyres is not well quantified. Using quantitative measurements of six major marine microorganisms in the guts of six distinct but co-occurring salp species from the North Pacific Subtropical Gyre, we examined the impact and dynamics of salp feeding on marine microorganisms in a vast open ocean region. All salps preferentially removed prey greater than 1 μm in diameter, including marine …

Clustering Of Temporal And Visual Data: Recent Advancements, Priyanka Mudgal

Computer Science Faculty Publications and Presentations

Clustering plays a central role in uncovering latent structure within both temporal and visual data. It enables critical insights in various domains including healthcare, finance, surveillance, autonomous systems, and many more. With the growing volume and complexity of time-series and image-based datasets, there is an increasing demand for robust, flexible, and scalable clustering algorithms. Although these modalities differ—time-series being inherently sequential and vision data being spatial—they exhibit common challenges such as high dimensionality, noise, variability in alignment and scale, and the need for interpretable groupings. This survey presents a comprehensive review of recent advancements in clustering methods that are adaptable …

The Gut Microbiota Shapes The Human And Murine Breath Volatilome, Ariel J. Hernandez-Leyva, Amalia Z. Berna, Maggie H. Bui, Yang Liu, Anne L. Rosen, Michael A. Lint, Samantha A. Whiteside, Natalia Jaeger, Nikhilesh Joardar, Wentai Luo, Multiple Additional Authors

Chemistry Faculty Publications and Presentations

The gut microbiota is crucial to health, yet implementation of microbiota-based therapeutics is limited by the lack of rapid diagnostics. We hypothesize that breath contains gut microbe-derived volatile organic compounds (VOCs) reflecting microbiota composition and metabolism. In healthy children, we found that breath VOC composition (or volatilome), assessed by gas chromatography-mass spectrometry, correlates with gut microbiome composition and function. By capturing exhaled breath from human-stool-colonized and monocolonized gnotobiotic mice, we profiled breath VOCs and discovered that murine breath is also significantly influenced by the gut microbiome. VOCs from cultured gut microbes were identified in vivo in monocolonized gnotobiotic colonized mice. …

Ureilite Meteorite Petrofabrics: Evolution And Formation Deformational Conditions, Benjamin Botwe Agyemang

Dissertations and Theses

This thesis examines the origin and development of crystallographic fabrics in ureilites, which are primitive achondritic meteorites interpreted as residues of partial melting from a differentiated parent body. In this study, we evaluate three fabric-forming mechanisms: gravitational cumulate crystallization, shock-induced deformation, and flow alignment associated with melt extraction and convective stirring. A quantitative Electron Backscatter Diffraction (EBSD) analysis was conducted on six ureilitic meteorites to assess olivine Lattice Preferred Orientation (LPO), Shape Preferred Orientation (SPO), the connection between SPO and LPO, and other deformation metrics, including Grain Orientation Spread (GOS), and Crystal Rotation Axis (CRA). Our results suggest that most …

Microbial Communities And Biogeochemistry Of A Melting Rocky Mountain Glacier, Pacifica Sommers, Elizabeth Traver, Alison Orthel, Andrew G. Fountain, Jacki Klancher, Steven K. Schmidt

Geology Faculty Publications and Presentations

Mountain glaciers are disappearing rapidly, and with their disappearance, we may be losing unstudied biodiversity and genetic resources. A variety of habitats for microorganisms exist on glaciers, especially within pockets of supraglacial sediments (cryoconite) that support high levels of biological activity and diversity. We used biogeochemical approaches, high-throughput DNA sequencing, and microscopy to describe the biogeochemistry and microbial communities of supraglacial sediments on the Dinwoody Glacier in the Wind River Range, Wyoming. Carbon (C) and nitrogen (N) concentrations were high, and C:N ratios were close to the Redfield ratio indicating active nutrient cycling. We found unique microbial communities in sediments …

Evaluating The Fate And Variability Of Soil Organic Carbon And Nitrogen Species Under Conservation Practices In The Raccoon River Watershed, Zhonglong Zhang, May Wu

Civil and Environmental Engineering Faculty Publications and Presentations

This study evaluates the fate and variability of soil organic carbon (SOC) stocks and nitrogen species using the latest version of the Soil and Water Assessment Tool– Carbon (SWAT-C) and assesses how conservation practices influence their dynamics in the Raccoon River Watershed (RRW). Dominated by intensive agricultural pro- duction, the RRW is a significant contributor of sediment and nutrient loads to local rivers and the Mississippi River. This SWAT-C model simulates the export of SOC and nitrogen species and evaluates their responses under varying management scenarios. Model calibration was performed for streamflow, sediment, nitrate, total nitrogen, and organic carbon with …

Wild@Fire2025: Overview Of Word-Level Code-Mixed Language Identification In Dravidian Languages, Ameeta Agrawal, Asha Hegde, Sharal Coelho, Sabur Butt, Fazlourrahman Balouchzahi, Sudha V, Shashirekha Hosahalli Lakshmaiah

Computer Science Faculty Publications and Presentations

Code-mixing is considered as a linguistic phenomenon that combines several languages into one text. It has now become very common in multilingual societies, especially in digital communication. Word-Level Identification of Languages in Dravidian Languages (WILD) - a Code-mixed Language Identification (CoLI) in Dravidian languages shared task, organized as a part of Forum for Information Retrieval and Evaluation (FIRE) 2025, put forward these challenges to the researchers by asking them to develop models capable of classifying words in code-mixed texts involving Dravidian languages - Tamil, Telugu, Malayalam, Kannada, and Tulu, which are interwoven with English. It poses significant challenges due to …

Research Progress On Generating Perfect Vortex Beams Based On Metasurfaces, Xiujuan Liu, Manna Gu, Ying Tian, Mingfeng Zheng, Bo Fang, Zhi Hong, Chee Leong Tan, Xufeng Jing

Electrical and Computer Engineering Faculty Publications and Presentations

This article reviews the latest advances in the generation and control of perfect vector beams using metasurfaces. In recent years, metasurfaces have garnered increasing interest due to their simple fabrication and easy integration. Perfect vortex beams (PVBs), as a type of vector beams, exhibit complex polarization states that require the superposition of multiple phases for their generation. The use of metasurfaces provides a compact platform for the generation of perfect vortex beams and enables more complex vortex beam control tasks, which are quite challenging for traditional optics. This paper begins by introducing the principle of perfect vortex beam generation using …

Cognitive And Economic Development, John Luke Gallup

Economics Faculty Publications and Presentations

A burgeoning literature has found that early childhood health conditions of individuals have large causal effects on their cognitive development, education and earnings. How much does early cognitive development contribute to the national economy? Although researchers have long studied the role of worker health for economic growth, they have not assessed the role of early cognitive development.

Cognitive ability is the foundation of human capital, affecting both educational attainment and economic growth. The risk factors for poor cognitive development are very high in many countries. Each risk factor also causes child mortality, making child survival a viable proxy for good …

Annual Faculty Senate Meeting Minutes October 2025-June 2026, Portland State University Faculty Senate

Annual Compilations of the Faculty Senate Minutes (Minutes Only)

Meeting minutes and summaries of Faculty Senate actions for the academic year 2025-26.

Faculty Senate Monthly Packet January 2026, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The January 2026 monthly packet includes the agenda, appendices, and the Faculty Senate minutes and attachments given in the meeting held January 5, 2026.

Scalar Source Localization Using Multi-Sensor Domains Of Dependence In Turbulent Channel Fow, Zejian You, Xiaowei Zhu, Qi Wang

Mechanical and Materials Engineering Faculty Publications and Presentations

Tracking hazardous events such as wildfire smoke, coastal oil spills, or chemical releases in natural environments is complicated by turbulent dispersion and molecular diffusion. This study presents a method to localize pollutant sources rapidly and accurately using infinite time-averaged measurements from a multi-sensor network, leveraging the duality between mean forward and adjoint scalar fields. The forward-adjoint duality states that measurements at the sensor (forward feld) are equal to the adjoint field at the source, providing crucial spatial information about the source. Consequently, the adjoint scalar fields can be interpreted as the domain of dependence for the sensor observations [1, 2]. …

A Guide To Human Ecology Mapping: An Approach For Understanding Human-Environment Connections, Thien-Kim Bui, Rebecca J. Mclain, David Banis, Lee Cerveny

Occasional Papers in Geography

Occasional Papers in Geography Publication No. 9

Places matter to people, and maps can help people and communities share why places matter. Over the past 30 years, public participation GIS (PPGIS) and other forms of human ecology mapping (HEM) have become important ways for agencies, non-governmental organizations, environmental and community advocacy groups, university researchers, and others to learn about or advocate for what matters to people about landscapes they visit, use, or love.

HEM is a method for mapping human-environment interactions and connections. This manual is intended for the planner or practitioner who is interested in using HEM to strengthen …

Solving The Middle School Math Problem To Increase Achievement, Andre Goodlow

Educational Leadership Professional Doctorate Dissertations

This study used improvement science to address persistent and disproportionate low mathematics achievement among middle school students, particularly Black/African American and Hispanic students, in an urban school district in the Pacific Northwest. Local data indicated significant deficiencies in math proficiency, with the target district exhibiting achievement disparities exceeding state averages. The project investigated root causes of low math achievement, prioritizing the enhancement of foundational math skills and the implementation of evidence-based interventions. The improvement theory centered on deploying an evidence-based core math curriculum and intervention program for incoming middle school students, tested through cycles during a four-week summer school program. …

Pláticas Of Latinas In Educational Leadership: Stories Of Identity, Resilience, And Transformation, Vanessa Davalos

Educational Leadership Professional Doctorate Dissertations

Despite federal and state equity laws that prohibit discrimination based on sex and national origin, women remain significantly underrepresented in K–12 educational leadership, with Latina leaders experiencing even greater disparities. While the number of Hispanic students in public schools continues to grow, the representation of Latina leaders has not kept pace, creating a critical gap between those leading schools and the communities they serve.

The purpose of this qualitative phenomenological study is to provide insight into the lived experiences of Latina educational leaders in order to deepen understanding of how identity, role, and leadership intersect (Hernandez & Murakami, 2016). Centering …

Faculty Senate Monthly Packet October 2026, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The October 2026 monthly packet includes the agenda, appendices, and the Faculty Senate minutes and attachments given in the meeting held October 19, 2026.

Faculty Senate Monthly Packet May 2026, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The May 2026 monthly packet includes the agenda, appendices, and the Faculty Senate minutes and attachments given in the meeting held May 4, 2026.

Numerics: A .Net Library For Numerical Computing, Statistical Analysis, And Risk Assessment, C. Haden Smith, Woodrow L. Fields, Julian Gonzalez, Sadie Niblett, Brennan Beam, Brian Skahill

Mathematics and Statistics Faculty Publications and Presentations

Numerics is a free and open-source numerical computing library for .NET, developed by the U.S. Army Corps of Engineers Risk Management Center (USACE-RMC). The library provides 43 univariate probability distributions with L-moment and maximum likelihood parameter estimation, eight Markov Chain Monte Carlo (MCMC) samplers for Bayesian inference, bootstrap uncertainty quantification, bivariate copulas, optimization algorithms, and numerical methods for integration, differentiation, root finding, and linear algebra. Numerics targets engineers, scientists, and analysts working in infrastructure risk assessment, flood frequency analysis, and Monte Carlo simulation within .NET-based enterprise systems. The library supports .NET 8.0 through 10.0 and .NET Framework 4.8.1 and is …

Artemisia Gentileschi's Last Susanna, Shelby A. Morgan

Anthós

Artemisia Gentileschi (1593-1645), a celebrated 17th century Baroque painter, depicted the biblical story of Susanna and the Elders six times in her long career of approximately 44 years (1610-1654). The first five were all painted and arranged vertically with Susanna's nude body exposed. Whereas her last Susanna (1652) and consequently her final known painting was painted horizontally with fabric covering, yet skimming Susanna’s nude body underneath. My research question is: Why at such a late stage in her career did Artemisia decide to reconfigure the composition of Susanna and the Elders and transform the representation of Susanna’s body through this …

Chatbot Therapy - Help Or Hindrance, Kadi Rae Smith

Anthós

Introduction

Generative artificial intelligence (Gen-AI) chatbots are complex computer programs designed to mimic human conversations using programming that incorporates large language models (LLM) and natural language models (NLM) to simulate human interactions that are being rapidly integrated into everyday life across an increasing amount of online platforms. This article explores the applications and efficacy of chatbots for mental healthcare, from self-directed chatbot interactions to clinician-supervised implementation of chatbot-based therapeutic tools, weighing the benefits and limitations of this ever-expanding technology.

Methodology/Taxonomy

A literature review was conducted primarily using Web of Science, accessed through Portland State University, and Google Scholar, with specifications …

Into Me See: Visibility, Recognition, And The Need To Be Seen In Kazuo Ishiguro’S Never Let Me Go, Vicki L. Wine Carney

Anthós

While critical scholarship on Kazuo Ishiguro’s Never Let Me Go often emphasizes bioethics, transhumanism, and the commodification of life, this lens overlooks the novel’s profound engagement with the psychological necessity of visibility. This paper argues that the tragedy of the clones is fundamentally a crisis of recognition, where invisibility is not incidental but structurally produced to facilitate exploitation. Drawing on Caroline Levine’s concept of the "Form of Utility" and Axel Honneth’s Theory of Recognition, this study examines how systemic indoctrination and objectification deny the clones their innate humanity to soothe the conscience of the "normals." Furthermore, it analyzes the characters’ …

Drag’S Impact On Drag Lives, José L. Oropeza Iii

Anthós

Drag’s Impact On Drag Lives

In light of recent political developments where Drag and Trans identities are being punished, why do people still participate in Drag? If there are repercussion to face for being a Drag Queen, then surely it must affect their lives for the better for them to continue the practice.

Through an autoethnographic approach to researching the Portland, OR Drag community, I collected transcripts of conversations with local Queens, took notes of community interactions, and put myself in Drag for the first time as a Queer man to better understand the Drag community and why they Drag. …

Creating Community Through Walking The Talk For Dementia, Kate Irving, Fernando Aguzzoli Peres, Walter D. Dawson, Jonathan Adrián Zegarra-Valdivia, Lingani Mbakile-Mahlanza, Iracema Leroi, Sherril B. Gelmon

Institute on Aging Publications

Objectives

Creating community is not only therapeutic—it has been described as essential. This study explores a process of community-building among people with lived and professional experience in the dementia field, during Walking the Talk for Dementia (WTD), a week-long, immersive event on the Camino de Santiago in Spain. Absence of community can lead to fragmented support for both people living with dementia and their care partners and for those working in the field. Achieving a sense of community, however, can be complex.

Methods

A qualitative evaluation was conducted with 79 participants from 27 countries, incorporating pre-, during and post-event reflections. …

2025 Oregon Statewide Homelessness Estimates, Minji Cho, Jacen Greene, Marisa Zapata, Franklin H. Spurbeck

Homelessness Research & Action Collaborative Publications and Presentations

The Point-in-Time (PIT) Count is a census of people experiencing both sheltered and unsheltered homelessness on a single night in January. The federal government requires this at least every other year as a condition of funding it distributes to Continuums of Care (CoCs), networks of government agencies and service providers that manage homelessness services and funding in specific regions. In 2025, all Oregon CoCs conducted an unsheltered count and submitted both unsheltered and sheltered PIT Counts data.

This report provides county-level unsheltered and sheltered totals for all Oregon counties and across the state, as well as the Housing Inventory Count …

Organizational Causes Of Chronic Absenteeism: Unpacking The Conditions For Learning To Increase Regular Attendance, Melissa Glover

Educational Leadership Professional Doctorate Dissertations

This study employed an improvement science methodology, using plan-do-study-act (PDSA) cycles of improvement, to address the persistent problem of chronic absenteeism within the Gateway School District, where annual absentee rates hovered around 45% and were historically 10% higher for students with disabilities compared to their nondisabled peers. The leadership team engaged in a thorough review of parent and student perceptions of school and aligned findings with Chang’s (2019) conditions for learning framework to pinpoint actionable areas for growth. These findings were then organized into a theory of action using a driver diagram approach. This foundational work led to the identification …

Key To Spartina Of The West Coast Based On Vegetative Characteristics, Mary Pfauth, Mark D. Sytsma, Mitchell Kloer, Jennifer Riddle, Jacob Rose, Gabriel E. Campbell

Center for Lakes and Reservoirs Publications and Presentations

In their natural condition, Pacific Coast estuaries have extensive open mudflats in the intertidal area that are important shorebird feeding habitat and are used for oystering and recreational fishing. Several non-native cordgrass species are invading Pacific estuaries and damaging these functions and uses. Early detection is critical to effective management of cordgrass infestation. This key is intended to provide an easy-to-use reference for quick identification of Spartina (synonym: Sporobolus) species on the Pacific coast. We choose to focus on vegetative characteristics here, since flowers are not always visible when it can be advantageous to survey.

This publication is intended to …

Machine Learning For Economists, John Luke Gallup

Economics Faculty Publications and Presentations

Explication of machine learning algorithms and their usefulness for economic research. The prediction algorithms of Random Forest, Gradient Boost Machines, Neural Networks and Support Vector Machines are built from simple steps applied at large scale to generate surprisingly precise nonlinear estimates. Although useful for processing and interpreting new forms of data, their application to economics research is limited because they do not provide readily interpretable evidence of the causes of outcomes.

Data And Code For: Combined Effects Of Forest Fire And Climate Warming On Seasonal Snow In The Western Oregon Cascades, Joseph D. Vigil

Environmental Science and Management Datasets

This dataset supports a study examining the combined effects of forest fire and climate warming on seasonal snow in the Breitenbush watershed of the western Oregon Cascades. The archive includes daily SnowModel snow water equivalent outputs for forested, current post-fire, mid-century, and end-century climate scenarios; field meteorological and manual snow observations; station metadata; modified SnowModel code used to represent post-fire snow-albedo decay; and R code used to calculate snow metrics and statistical comparisons reported in the associated manuscript. Derived results and documentation are included to support reproduction of the primary analyses.