Digital Commons Network^™

Analyzing Intensifying Storm Events Correlation To Landslide Frequency In Portland’S West Hills, Aurora Villa Juan

Student Research Symposium

As the Pacific Northwest climate changes, extreme weather, such as intensifying storms, and a shift in the type of precipitation experienced with warmer winters causing more precipitation to fall as rain instead of snow, may lead to an increased frequency of landslides. There have been several recent landslides in Portland, noticeable to the public, particularly in areas of high elevation such as Council Crest, which stands at 1,073 feet. Additionally, residents of neighboring homes have observed changes in the landscape, including those on private properties. To better safeguard both public and private property, comprehensive research and mitigation efforts are required. …

Comparative Life Cycle Assessment Of Recycling Processes For Perovskite Solar Cells, Juan P. Herrera, Jules Freeman, Achyuth Ravilla, Ilke Celik

Student Research Symposium

Perovskite solar cells (PSCs) have emerged as a promising option for solar energy generation. However, it is essential to consider the environmental impact of these innovative photovoltaic (PV) technologies as the industry moves towards commercialization. Researchers are currently exploring ways to recycle PSCs to recover valuable materials and reduce their environmental impact at the end of their life. To ensure the sustainability of PSCs, this study evaluates and compares the environmental impacts of five recently developed recycling approaches. The Tool for Reduction and Assessment of Chemicals (TRACI) method was utilized to measure environmental impacts in categories such as acidification (kg …

Activism And Stress, Ashanti Laine T. Peredo, Taylor Gayton, Lalaine Sevillano

Student Research Symposium

Black women often shoulder a heavier burden of financial, social, and physical responsibilities within their families compared to non-Black individuals who do not identify as women. This increased load contributes significantly to mental health disorders and psychological distress and well as physical disparities. When compounded with experiences of racism and sexism, these responsibilities can lead to a sense of social invisibility and foster a tendency towards stoicism. This study is a mixed method study as it aims to quantitatively examine the relationship between activism, physical wellbeing measured by the Conserved Transcriptional Response to Adversity (CTRA), and psychological wellbeing among Black …

Improved Genome Maintenance And Dna Replication In The Anoxia Tolerant Annual Killifish, Riley A. Roth-Carter

Student Research Symposium

Timely and faithful replication of the genome is a requirement for cell survival and proliferation, with errors in this process leading to cancers and cell death. DNA replication during exposure to stressful conditions can lead to increased mutational burden, with collapsed replication forks causing mutations leading to cancers due to loss of repair capabilities during these exposures. Learning how stressful DNA replication takes places can lead to a better understanding of how resistant cancers survive similar conditions, like hypoxic tumor microenvironment, direct irradiation, and DNA damaging chemotherapeutics. Using an extremophile model, Austrofundulus limnaeus, which can survive these genotoxic stressors could …

Gangism: An 'Elementary Form Of Religious Life', Robert Northman

Student Research Symposium

This study is intended to examine the question: could gangs be a form of religion? The study will examine Steven Cureton's ethnographic case study of a street gang as found in his work titled Hoover Crips (2008), where I will then analyze the findings within the sociological framework of Emile Durkheim’s theory of religion as set forth in his classic book titled Elementary Forms of Religious Life (1912).

This exploration faces challenges as the terms “gang” and “religion” are both hotly contested, and discussions on each have largely occurred independently, leaving a significant gap for this research to address. This …

Relationship Between Trunk Cross-Sectional Area Growth And Water Stress In Garry Oaks (Q. Garryana): A Species Of Conservation Concern, John Cochrane

Student Research Symposium

In the Pacific Northwest, Quercus garryana (Garry oak trees) support over 627 native species. Garry oak natural habitat was originally maintained by indigenous practices but has been reduced to 5-10% of its range due to change in land management strategies. To support oak conservation, we need to understand heat and water affect the growth and physiology of this species. In this study, we created a fixed linear model of trunk cross-sectional growth with water stress (Ψ), photosynthetic water-use efficiency (δ¹³C), and leaf Carbon-Nitrogen ratio. We collected branch samples from the canopies of 47-64 mature Garry oaks in the …

Story Of Your Lazy Function’S Life: A Bidirectional Demand Semantics For Mechanized Cost Analysis Of Lazy Programs, Laura Israel, Nicholas Coltharp

Student Research Symposium

Lazy evaluation is a powerful tool that enables better compositionality and potentially better performance in functional programming, but it is challenging to analyze its computation cost. Existing works either require manually annotating sharing, or rely on separation logic to reason about heaps of mutable cells. In this paper, we propose a bidirectional demand semantics that allows for reasoning about the computation cost of lazy programs without relying on special program logics. To show the effectiveness of our approach, we apply the demand semantics to a variety of case studies including insertion sort, selection sort, Okasaki's banker's queue, and the push …

Expressive And Instrumental Social Capital Facilitates Network Connections For Community College Transfer Students In Stem, Makenna R. Stone

Student Research Symposium

Students that transfer from a community college (CC) to a university often experience social and academic barriers that can lead to feelings of isolation and challenge their persistence. One way to alleviate these barriers is to develop capital. We aimed to understand how a cohort of CC STEM transfer students may have developed and exhibited social capital, or “assets accessed through social connections”. We leveraged the Network Theory of Social Capital to examine the instrumental (i.e., concrete advice and support) and expressive (i.e., emotional support and encouragement) actions that led to feelings of connection and persistence. We conducted semi-structured interviews …

Systematic Comparison Of Reservoir Computing Frameworks, Nihar S. Koppolu, Christof Teuscher

Student Research Symposium

In this poster, we present a systematic evaluation and comparison of five Reservoir computing (RC) software simulation frameworks, namely reservoirpy, RcTorch, pyRCN, pytorch-esn, and ReservoirComputing.jl. RC is a specific machine learning approach that leverages fixed, nonlinear systems to map signals into higher dimensions. Its unique strength lies in training only the readout layer, which reduces the training complexity. RC excels in temporal signal processing and is also well suited for various physical implementations. The increasing interest in RC has led to the proliferation of various RC simulation frameworks. Our RC simulation framework evaluation focuses on a feature comparison, documentation quality, …

Online Or In-Person: What Mode Of Conversation Makes People Feel The Most Socially Connected?, Nathan P. Gheorghita, Cynthia D. Mohr, Maryann Samson, Sheila Mccabe, Julia Lynch

Student Research Symposium

Since the onset of the COVID-19 pandemic, people have been spending significantly more time online. Today, people spend an average of 6 hours and 58 minutes online every day, and much of this time is spent socializing via various platforms. Many studies have examined the benefits and risks of socializing online, but few studies have examined online conversations specifically. In this study I aim to uncover the differences in perceived social connection based on the medium of conversation. To do this, I will administer the Connectedness During Conversations Scale (CDCS) to a sample of Portland State University students (N=80). The …

Deriving Analytical Design Constraints For Absolute & Relative Encoding Schemes In Functional Subnetworks, Cody W. Scharzenberger-Braet, Alexander Hunt

Student Research Symposium

As neural networks have become prolific solutions to modern problems, there has been a congruent rise in the popularity of the numerical machine learning techniques used to design them. While they are highly generalizable, numerical methods tend to produce networks that act as inscrutable “black boxes,” making it difficult to interpret their behavior. One solution to the problem of network transparency is to use analytical techniques, but these methods are underdeveloped compared to their numerical alternatives. In order to enhance the viability of analytical techniques, this work extends previous efforts to quantify the impact that non-spiking neural encoding schemes have …

Dragon Pseudoscorpions Shed Light On Ancient Climate History In The Pacific Northwest, Joshua W. Hootman

Student Research Symposium

Pseudoscorpions are an ancient and diverse group of understudied arachnids, and there is much to be learned about their relationships to each other. Pseudoscorpions are one of many leaf-litter dwelling and low dispersing invertebrates that inhabit the forests of the Pacific Northwest. Previous phylogeographic studies of Pacific Northwest taxa have shed light on some of the climatic and geologic events that have shaped the area's flora and fauna. One purpose of this study is to determine if there is similar genetic structuring within the pseudoscorpion populations present in the study area, or if there is even more structure likely influenced …

Say It With Flowers: The Semiotics Of A Not-So Secret Language, Cecilia Januszewski

Student Research Symposium

The Victorian flower language Is mythologized as a widely known communicatory practice Involving flowers with symbolic meanings and creative bouquet-making In order to convey personal and emotional messages. This Is not entirely accurate: floriography was a theoretical floral code based on the Turkish practice of selam, which the British and French upper class reinterpreted and edited to create their own version. This thesis examines how floriography functions semiotically, both as a mythologized language and as It was actually used, and traces the lineage of floral semiotics and greeting cards from Victorian Britain to contemporary America. I analyze floral semiotics, both …

Power & Planning: A Critical Comparison Of Tribal And Non-Tribal Wildfire Protection Plans, Christian J. Heisler

Student Research Symposium

In 2003, the US government passed the Healthy Forest Restoration Act, which urged wildfire-prone communities to develop Community Wildfire Protection Plans (CWPPs). These plans allow local groups to contextualize risk, practice social learning, and develop social capital while addressing wildfire risk. Within planning realms, however, decision-making power is usually concentrated unequally between social groups which can limit the influence of marginalized communities. Tribal nations, specifically, have been excluded from wildfire planning since European contact, signaling that CWPPs may not reflect Indigenous worldviews and priorities. Given the recent push from the federal government to increase land management collaboration with tribes, it …

Prosodic Analysis Of Wh-Indeterminate Questions In L2 Korean, Jung In Lee

Student Research Symposium

Wh-indeterminate questions, particularly wh-questions and yes-no questions, in Korean are ambiguous due to the limited morpho-syntactic markers in the sentence. The absence of these markers leaves two questions syntactically identical, leading to lexical ambiguity. The disambiguation of these two questions relies primarily on prosodic cues. Drawing from previous studies in the L1 Korean context, this study examines the intonation patterns of English learners of Korean in producing and perceiving wh-questions and yes-no questions and explores if there is any sign of L1 influence from English. Five English learners of Korean, who received formal instruction in Korean at a U.S. university, …

Community Resilience In Portland Parkland Soils, Jason W. Triefenbach

Student Research Symposium

Proposing soil nutrient testing as a model for community research and ecology education, this presentation considers pathways to raising public engagement with sustainability issues while enhancing community resilience and social capital. "Community Resilience in Portland Parkland Soils" represents my research thus far on the conjoined topics of urban soils and community efficacy, in which I have attempted to synthesize biogeophysical processes in city parklands with strategies for raising public awareness about urban ecosystems.

I measured and compared soil nitrogen levels at 8 iconic Portland area parks using commercially- available garden test kits, while concurrently researching the historical and contemporary land …

“Fruit From A Poisonous Tree”? Constituting Logics Of Law Enforcement Phlebotomy, Anne Johnson

Student Research Symposium

In at least 17 states in the United States, police are drawing blood from drivers they suspect of impairment. Despite concerns about civil rights, ethics of consent in custody, and use of force, law enforcement phlebotomy (LEP) remains critically understudied. Through 27 in-depth, semi-structured interviews with police phlebotomists and LEP program officials from 10 states, this study begins to fill that gap, asking: What are the logics of law enforcement phlebotomy? Constituting these logics–as articulated by police–are beliefs about both policing and phlebotomy, and officers’ motivations in the fight against impaired driving. This article assesses how the logics of law …

My Father's Story: An Ethnography About Language Loss, Ariel Wilsey-Gopp

Student Research Symposium

War disrupts everything, including a child’s developing language and cultural identity. My father grew up in both Serbia and Germany during the post-WWII political upheaval. By the time he was an adult, he knew five languages, yet lacked his own language and languaculture (Agar, 1994).

It benefits us to understand more completely the effects of language loss as political borders continue to shift and human migration increases. Research in social sciences, psychology, and biology all examine the effects of trauma, the brain, and child development. Applied linguistics examines language loss in relation to Second Language Acquisition (Altarriba & Heredia, …

Queer Rural Youth Online: A Digital Ethnography, Joseph R. Burns

Student Research Symposium

This presentation is based on digital ethnographic fieldwork conducted in 2023 within Queer subcommunities on the social media sites Reddit and Twitter (now known as X) and data collected from interviews with Queer rural youth members of these communities. The data reveal that social media use directly influences the lives and actions of Queer rural youth, who use the space to build social connections, shape their personal identities, and seek advice pertaining to their in-person lives and decisions. By using these spaces, Queer rural youth build both bonding and bridging social capital, learn to subvert restrictions to their Internet access, …

Considering The Historical And Systemic Context, To What Extent Are Cuban Women’S Healthcare And Reproductive Rights Affected By The Privacy And Social Influence Of Cuba Today?, Autumn Cowell

Student Research Symposium

This paper will examine how historical and systemic values continue to frame social influences thus impacting Cuban women’s healthcare and reproductive rights. If the impact of history and systems still affects social influences then Women’s Healthcare and Reproductive Rights may be compromised. This investigation will highlight the potential benefits and risks of historical and systemic values that have affected challenges or changes within Cuban culture. And how these social influences are found within the areas of prevention, intervention, and treatment. This paper hopes to outline how the Cuban government and society are sustaining the protection of Cuban women’s access to …

Phytoplankton Community Dynamics In The Northern California Current System, Kristin Forgrave

Student Research Symposium

The Northern California Current system is a productive coastal ecosystem that encompasses a variety of temporal and spatial features. The photosynthetic microbial community plays a crucial role in supporting the rich ecosystem and economically important fisheries. My research integrates data across distance and two years to investigate the community composition of two major phytoplankton groups in this system: picocyanobacteria and picoeukaryotes. The abundances and sizes of the phytoplankton were measured using flow cytometry. Picoeukaryotes were found to be present at similar concentrations in both summer and winter. Abundances of both cell types were comparable in the winter, but picocyanobacteria were …

Community Responses To Us Regional Clean Hydrogen Hubs, Bethani Turley

Student Research Symposium

In 2023, the Bipartisan Infrastructure Law designated 7 billion dollars to fund regional hydrogen hubs across the US with the goal of kickstarting a utility scale hydrogen economy for the US electric grid. A promising technology in the renewable energy transition, hydrogen can be made from a multitude of energy sources, often designated by colors: green hydrogen is made from solar and wind, pink hydrogen from nuclear, and blue hydrogen from natural gas. This presentation examines this new hydrogen economy through the case study of the Appalachian Regional Clean Hydrogen Hub (ARCH2). ARCH2 is a blue hydrogen hub proposal by …

The Influence Of A Ubiquitous Filter Feeder On Coastal Microbial Communities., Melissa Steinman, Moritz S. Schmid, Robert K. Cowen, Su Sponaugle, Kelly R. Sutherland, Anne W. Thompson

Student Research Symposium

Doliolids have a unique ability to impact the marine microbial community through bloom events and high filtration rates. Their predation on large eukaryotic microorganisms is established and evidence of predation on smaller prokaryotic microorganisms is beginning to emerge. We studied the retention of both eukaryotic and prokaryotic microbial taxa by wild-caught doliolids in the northern California Current system. We use qPCR to quantify the impact of doliolids on three important and globally abundant taxa: Synechococcus, SAR11 and diatoms. Doliolids were collected during bloom events identified at three different shelf locations with variable upwelling intensities. We discovered that in addition …

Variability Of Grazing By Appendicularians On Prochlorococcus, Carey Sweeney

Student Research Symposium

The marine picocyanobacterium, Prochlorococcus is the most abundant photosynthetic cell on Earth. These cells are critical to global primary productivity and are critical to biogeochemical cycles of the open ocean. While abiotic environmental factors that influence Prochlorococcus are relatively well-understood, biotic controls, especially predation, are not well-studied. Appendicularians are ubiquitous invertebrate grazers that feed on microbes including Prochlorococcus in the open ocean. However, the details of this feeding interaction have not been characterized. In a laboratory study, I showed that prey retention of Prochlorococcus increases as the life stage of the appendicularians advances and increases with increasing concentration of prey. …

Systematic Comparison Of Propensity Score Matching And Structural Causal Modeling For Clinical Applications, With A Case Study Of Albumin Treatment For Acute Kidney Injury (Aki) Patients: Propensity Score Matching Vs. Structural Causal Models, Layaal Khellah

Student Research Symposium

Introduction:

Propensity Score Matching (PSM) and Structural Causal Models (SCMs) are key approaches in causal inference for treatment evaluation and clinical decisions, both rooted in the potential outcome framework but differing in their foundations—PSM follows Rubin's Causal Model, while SCMs adhere to the Structural Theory of Causation.

Methods:

Our study compares PSM and SCMs in clinical contexts, focusing on albumin as an AKI treatment. We examine each method's steps, highlighting differences. Using data from AKI patients with cirrhosis, we assess albumin’s treatment efficacy with both PSM and SCMs, offering insights into their performance in estimating causal effects..

Results:

PSM and …

Behavioral Intention For Ai Usage In Higher Education, Isaac A. Odai, Elliot Wiley

Student Research Symposium

This study sought to further understand the cognitive factors that influence undergraduate students' behavioral intention to use generative AI. Generative AI's presence in academic spaces opens the door for ethical and pedagogical questions. This study surveyed 51 undergraduate communication students to measure their attitudes, subjective norms, self efficacy and their behavioral intention to use GenAI for school work. The results of this study showed behavioral intent had a positive relationship with attitudes and subjective norms. The implications of these findings show that personal beliefs and the perceived beliefs of others are correlated to undergraduate students’ intent to use GenAI for …

Photocathodes From Aerobic Oxidation Of Tellurorhodamines, Amelia Jellison

Student Research Symposium

Contemporary dye-sensitized solar cells are far less efficient than silicon solar panels, therefore this project seeks to develop an improved dye sensitized photocathode. Tellurorhodamine dyes, including mesityl derivatives and tellurium black, have been chosen to increase efficiency through increased light harvesting. The photophysical and electrochemical properties of tellurorhodamines with varying structures are analyzed to quantify its efficiency to serve as a dye sensitized photo cathode. Dyes undergo aerobic oxidation facilitated by light, the absorption profile is obtained before and after. Mesityl derivatives are known to experience significant red-shifting following aerobic oxidation. At its base oxidation state, tellurium black experiences an …

Exploring The Potential Of Α-Aryl Substitution Of Gddota To Address Challenges Associated With Mri Contrast Agents., Charlene I. Kupara

Student Research Symposium

Gadolinium chelates have found widespread application as contrast agents in Magnetic Resonance Imaging (MRI) a cornerstone in modern medical diagnostics. In recent years two significant challenges have emerged to the use of Gd³⁺ chelates in MRI:

• The safety of these Gd³⁺-based agents, specifically related to the possible in vivo release of Gd³⁺.
• The environmental impact of anthropogenic Gd³⁺ pollution of surface waters arising from using contrast agents.

The escalating reports of Gd³⁺ presence in environmental matrices, and its adverse effects on marine life and human health, necessitate urgent intervention to mitigate consequential environmental …

Generative Artificial Intelligence, Co-Evolution, And Language Education, Steven L. Thorne

World Languages and Literatures Faculty Publications and Presentations

At this point in the history of applications of technology for language learning, there is nothing surprising about uses of video conferencing, social media, language tutorial websites and apps, online textbooks and grammars, translation tools, and video- and audio-based content (among others). As Internet theorist Clay Shirky has described it, “communications tools don't get socially interesting until they get technologically boring” (Shirky, 2008, p. 105), and indeed, there has been considerable interest in more deeply examining humans’ now quotidian uses of digital technologies and modalities as they potentially transform language use and trajectories of development. Examples of incisive research …

Tragedy, Ownership, And Hospitality In Gerar: Lessons From Social Psychology, Moshe S. Rachmuth

World Languages and Literatures Faculty Publications and Presentations

Can the story of Isaac be read with tragedy in mind or is the second patriarch the comedic relief of Genesis? Scholars mostly see Isaac as the book’s fool and thus laughable. Even more clearly so in Gen 26:7-11 which recounts how, during the hunger migration of Isaac and Rebekah to Philistine Gerar, Isaac presented Rebekah as his sister. Comparing Genesis 26 with similar stories about Abraham and Sarah (Genesis 12, 20), Isaac and Rebekah are in lesser danger than Isaac’s parents. This work takes three steps to argue that the story supports the national identity of displaced Israelites. First, …