Digital Commons Network^™

Splitting Gaussian Densities To Minimize Variance Along A Direction Of Nonlinearity, Amit Kumar

Dissertations and Theses

Nonlinear functions of random vectors are frequently used in signal processing, and especially in state space tracking algorithms. Many of these algorithms require a way of estimating the probability density of the state vector at the output of the nonlinear function. Algorithms derived from Kalman Filter, such as Extended Kalman Filter and Unscented Kalman Filter, are popular choices for this, but they only estimate mean and covariance which may be insufficient to describe the non-Gaussian densities. On the other hand, Monte Carlo methods such as particle filters can be more capable but require much more computation. Gaussian mixture filters aim …

Domain Knowledge As Motion-Aware Inductive Bias For Deep Video Synthesis: Two Case Studies, Long Mai

Dissertations and Theses

Deep neural networks have been part of many breakthroughs in computer graphics and vision research. In the context of visual content synthesis, deep learning models have achieved impressive performance in the image domain. However, adapting the successes of image synthesis models to the video domain has been difficult, arguably due to the lack of sufficiently strong inductive biases that encourage the models to capture the temporal-dynamic nature of video data. Inductive bias refers to the prior knowledge incorporated into the learning models to explicitly drive the learning process toward the solutions that capture meaningful structures from data, which is critical …

Most Recent Rupture On The Boulder Creek Fault Triggered Bedrock Landsliding In The Nooksack Watershed, Whatcom County, Washington, Abigail Catherine Underwood

Dissertations and Theses

Catastrophic bedrock landslides with volumes ranging from 10⁶ to 10⁸ m³ contribute to rapid landscape evolution, often resulting in erosion rates that exceed the long-term average rates caused by tectonic uplift. Understanding the spatiotemporal trends of large bedrock landslides helps us understand previous drivers of landscape evolution as well as predict how the landscape will respond in the future. The Nooksack Watershed, Whatcom County, Washington, is particularly susceptible to large slope failures because of its high relief, seismic activity, local geology, and relatively abundant precipitation. Specifically, folded and faulted bedrock structures conducive to landsliding in addition to …

Urban Nesting Biology, Population Viability And Ecology Of The Willow Flycatcher, Empidonax Traillii, Stephanie Alexandra Byrne Doorly

Dissertations and Theses

Reproductive success, in any species, relies both on the habitat utilized to reproduce and on the successful reproductive output of individual animals within a population. Populations in turn rely on the reproductive fitness of the individual. Whether populations remain stable, grow, or decline ultimately relies on the combined reproductive output of the individuals within that population.

We studied the Willow Flycatcher (Empidonax traillii; henceforth WIFL), a well-studied Neartic-Neotropical migrant passerine whose breeding range extends from the east to west coast of North America. Across much of their range, and in particular in the western regions, breeding population are …

In Favor Of Bringing Game Theory Into Urban Studies And Planning Curriculum: Reintroducing An Underused Method For The Next Generation Of Urban Scholars, Brian Mcdonald Gardner

Dissertations and Theses

By looking at some historical examples of Urban Studies literature and theory (and a detailed dive into Neil Smith's "Toward a theory of gentrification…") this thesis makes the case that Game Theory has valid insights to add to the foundation of Urban Studies and Planning and should be included in Masters and Doctorate level curriculums. As a discipline Game Theory has revolutionized multiple other fields, and can be used both mathematically and/or non-mathematically. It is postulated below that the inclusion of Game Theory would help scholars and practitioners arrive at better outcomes. This case is made by reviewing various areas …

Short Warm-Side Wet-Bulb Temperature Distribution Tails Lead To Accelerated Increases In Extreme Threshold Exceedances Under Global Warming, Yianna Sotirios Bekris

Dissertations and Theses

Humid-heat extremes threaten human health and are increasing in frequency with global warming, so elucidating factors affecting their rate of change is critical. This thesis examines the role of historical (1985-2014) wet-bulb temperature distribution tail shape on the probability of wet-bulb temperature extreme threshold exceedances under 2°Celsius global warming. Analysis of global climate models and reanalysis reveals that non-Gaussian wet-bulb temperature distribution tails are common worldwide across extensive, spatially coherent regions. More rapid increases in the number of days exceeding the historical 95th percentile are projected in locations with shorter-than-Gaussian warm-side tails. Of the two primary components of wet-bulb temperature, …

Understanding Distruptive Change In Health Care: Perspectives From The Front Lines Of Covid, Wendy Vaughon

Dissertations and Theses

COVID-19 dramatically stressed an already overburdened healthcare system. Physicians, susceptible to burnout, bore the brunt of this threat as frontline providers. Limited data are available describing how the pandemic may have affected physician perceptions and beliefs, including experiences of burnout and plans to exit the field. Reddit, a social media website, allows physicians the ability to interact with their peers pseudonymously on a purpose-driven, publicly viewable subreddit (r/medicine). By providing a space for “physicians and other medical professionals” to interact, it is possible to observe unfiltered discourse.

This dissertation explores physician-peer discourse on Reddit prior to and during the COVID-19 …

Dress And Identity: Using Sartorial Artifacts To Explore Identity At Fort Vancouver, Dana Marie Sukau

Dissertations and Theses

How an individual dresses is an outward expression of their identity, which impacts how they are perceived by others and their daily interactions. By modifying their dress an individual can better adapt to changing social situations. The Pacific Northwest fur trade brought people of varied backgrounds together at frontier forts like the Hudson's Bay Company owned Fort Vancouver, located in modern day Vancouver, Washington. In these areas of culture contact social relations were frequently changing, and by adapting their dress an individual could put on various "social skins" differentially influencing their daily interactions (Loren 2001). Through the perspective of practice …

System Design For The Quantification Of Microbial Motility In Extreme Environments, Megan Marie Dubay

Dissertations and Theses

Motility of microorganisms is understudied but provides useful insights into their behavior. Organisms' ability to move autonomously changes how they interact with their environment--finding nutrients, interacting with other organisms, and avoiding unfavorable conditions. Understanding motility features can also be used to identify specific species, such as the identification of Vibrio cholerae in human samples. Motility might also be used as evidence of life existing in even the most extreme environments on Earth, and possibly beyond. Specialized microscopy systems can be required to examine the motility of microorganisms due to the nature of the environments to which the instruments are exposed. …

Multimodal Imaging Of Structural Concrete Using Image Fusion And Deep Learning, Sina Mehdinia

Dissertations and Theses

Concrete structures may be exposed to a variety of loads and environments during their service life. Non-destructive testing (NDT) techniques can be helpful in evaluating the condition of a structure. Imaging provides a visual representation of the interior of concrete and its condition non-destructively. Ground penetrating radar (GPR) and ultrasonic echo array (UEA) using electromagnetic and stress waves, respectively, provide the data that can be used to reconstruct an image. In this PhD dissertation, image reconstruction and fusion algorithms, simulation, and a deep learning model were investigated with the goal to lay the foundation for enhanced imaging applications for concrete. …

Model.Disclose(): Examination Of Obsessive-Compulsive Disorder Disclosure At Work, Timothy Allen Carsey

Dissertations and Theses

Research focused on Identity Management (IDM) in the workplace has explored the experiences of people with many different stigmatized identities (e.g., sexual orientation, gender identity, race/ethnicity, religiosity); however, research has only recently begun to explore IDM of mental illness in the workplace. One such identity, Obsessive-Compulsive Disorder (OCD), has remained particularly unexplored. Individuals with mental illnesses, such as OCD, experience unique consequences with their concealment and disclosure process. Specifically, OCD has both cognitive and behavioral components, and, the behavioral component of OCD can demonstrate to coworkers visible actions that are seen as "not normal" or "awkward," potentially unintentionally signaling the …

Decorrelated Deep Neural Networks: Learning Bias Invariant & Scanner Independent Features, And Causal Relationships Using A Novel Deep Learning Methods Based On Distance Correlation, Pranita Patil

Dissertations and Theses

Advancements in deep learning or deep neural networks have made it possible to reach expert-level performance in a variety of applications, even in challenging situations. However, a central challenge in all deep learning, as well as machine learning applications, is dealing with its dependency on the quality of data which can be significantly impacted by biases, confounders, and irrelevant variations in data which leads to spurious relationships and erroneous decisions. The main purpose of this dissertation is to build a robust deep learning model which considers and mitigates these biases. Another challenge with the deep learning model is learning associations …

Spatial Analysis Of Burn Severity And Streamflow Response In The Western Conus, Will Brendan Long

Dissertations and Theses

Wildfire increases the magnitude of runoff in catchments, which can lead to the degradation of ecosystems, risk to infrastructure, and loss of life. The Labor Day Fires of 2020 provided an opportunity to compare multiple large and severe wildfires with the objective of determining potential changes to hydrologic processes in Oregon Cascades watersheds. Geographic information systems (GIS) were implemented to determine the total percentage burned and percentage of high burn severity class of six watersheds on the west-slope of the Oregon Cascade Range. In addition, two control watersheds were included to contrast the influence of climatic effects. Spatial arrangement of …

Investigation Of Basal Imnaha Basalt Flows And Their Relationship To The Picture Gorge Basalt Of The Columbia River Basalt Group, Luke James Fredenberg

Dissertations and Theses

The lower American Bar flows (AB 1 and 2) of the Imnaha Basalt have previously been observed as being chemically similar to those of the Picture Gorge Basalt (PGB). Previous age data separate eruption of the Imnaha and Picture Gorge Basalts by approximately 1.5 Ma, precluding the possibility of a genetic link between the two basalt units. New age data for the Picture Gorge Basalt has expanded the eruptive timeframe and the earliest flows coincide with the eruption of the Imnaha Basalt, making it possible that the lower American Bar flows of the Imnaha Basalt and the Picture Gorge Basalt …

Health Literacy And People Diagnosed With Mental Illness, Beckie Child

Dissertations and Theses

Health literacy is a well-studied concept that has a large literature base. Yet, little is known about health literacy and people diagnosed with mental illnesses, and even less health literacy research speaks to people diagnosed with mental illness. I used a framework and approach of lived experience of psychiatric diagnosis and psychiatric survivor research to conceptualize and inform the study. It explores health literacy with people diagnosed with mental and physical health diagnoses using a small quantitative survey, focus groups, and an individual interview. The findings suggest that health literacy is a dynamic and complex construct that interacts with the …

Reconceiving The Relationship Between The Built Environment And Walking Behavior: Examining The Samples, Scales, And Methods In Travel Behavior Research, Jaime Pablo Orrego-Oñate

Dissertations and Theses

This dissertation aims to formulate a mechanism for the relationship between the urban form and walking choice that can be consistent across contexts. The motivation is the lack of concordant results in the magnitude of the environmental influence on walking choice in urban areas found in the literature. The dissertation identifies a series of limitations in previous research that could cause mixed results in the magnitudes of the association. This research elaborates an approach to overcome these limitations by proposing a mechanism of the activity density over walking modal share by controlling for trip distance distribution. The aim is an …

Does Instructional Autonomy Matter? Exploring Job Satisfaction For Math And Non-Math Teachers In Low, Middle, And High Ses Schools, Hannah Sean Ellefritz

Dissertations and Theses

Throughout the 2000s, standards-based education policies decreased the autonomy of public schools across the U.S., deprofessionalizing educators and limiting their participation in the development of curriculum and instructional policy. Many education scholars argue that, rather than professionals with specialized skills and knowledge, standards-based reforms position teachers as technicians, accountable for measurable output in accordance with externally imposed standards. This literature suggests that such education policies may have implications for teachers’ job satisfaction, especially those working in schools or subject fields that are particularly susceptible to standardized curriculum and accountability procedures. Using nationally representative data from the Teaching and Learning International …

An Analysis Of The Strengths And Weaknesses Of The Tulsa Remote Program, As An Effective Economic Development Strategy, Kristen J. Padilla

Dissertations and Theses

Cities do not exist in a vacuum. They are in constant competition for talented, educated individuals and growing, innovative businesses -even if that competition is not explicit or specific. Traditionally cities have been left with two economic development paths to help diversify their economies: attract talent but without jobs, or attract business but without a strong talent pool. However, due to technological advancements, exacerbated by the pandemic, a new and growing workforce that can work from anywhere has emerged, remote workers. This talent pool shifts traditional economic development attraction strategies from city to industry to city to talent.

Many remote …

Post-Fire Erosional And Hydrological Processes Promoting Debris Flow Initiation In A Douglas Fir And Western Hemlock Forest In The Riverside Burn Area, Oregon, Morena Nicole Hammer

Dissertations and Theses

Post-fire debris flows initiated by overland flow in the Pacific Northwest (PNW) are largely undocumented. Instead, debris flows are typically initiated by shallow landslides that result in a mud slurry of water and sediments traveling downhill under the force of gravity. However, because of the Fall 2020 fires in Oregon, the typical initiation style and erosional patterns in burned catchments may have changed because of unusually high burn severity. Due to the intensity of these fires, we set out to determine how hydrologic processes and erosion occurred, when they occurred, and what process was primarily responsible for the erosion that …

A Typology Of Foster Home Quality Elements In Relation To Foster Youth Mental Health, Paul Sorenson

Dissertations and Theses

Foster care has been one of the primary interventions in society's efforts to address child maltreatment. The foster parents and foster homes follow a process of certification intended to ensure that maltreated children be placed in substitute care that supports and encourages positive outcomes. One of the outcomes of principle concern is mental health. Few studies have been conducted that explore the makeup of certified foster homes with respect to the cumulative impact of multiple indicators of quality on mental health outcomes of foster youth.

This study sought to identify a typology of foster homes based on theorized indicators of …

What's Care Got To Do With It? Expulsion Practices In Family Child Care, Josephina Paulina Emmrich

Dissertations and Theses

Expulsion of children under five years old in early childhood care and education settings is a problem, especially in family child care programs with the highest expulsion rates across early childhood care and education settings. Recently passed Oregon legislation prohibits expulsion in child care programs (Oregon SB 236, 2021). Influencing outcomes for young children and the family child care providers who work with them. Family child care programs are small businesses primarily run by women who work alone from their homes. Systemic inequities contribute to a lack of support and access to resources for family child care providers. These inequities …

Leaving College Without A Degree: The Student Experience At An Urban Broad Access Institution, Andrea Marie Garrity

Dissertations and Theses

This thesis seeks to understand how students who leave college without a degree, or non-completers, experience broad access institutions in an effort to shift our thinking from the student characteristics that predict college dropout to how broad access institutions can better serve students and improve graduation rates. To answer this question, I conducted interviews with former students who had recently attended a broad access institution and left without a degree. Results show that participants expressed internalized views of the traditional college student archetype, which was reinforced through their college experience. Further, participants encountered significant bureaucratic challenges and barriers, and expressed …

Comparative Foreign Aid Analysis: Replacing The Competition Between Donors With Complementary Aid Policies, Emily Melinda Baker

Dissertations and Theses

Foreign Aid has been a topic of study for decades with few concrete findings on whether it is effective or not. Contemporary foreign aid is divided into two camps: the West and China, with little cooperation and plenty of politics between them. In this thesis I analyze the effectiveness of Western aid and Chinese aid in twelve sub-Saharan African states using annual HDI scores and GDP. I find there is a strong correlation between Western aid and the development measures used as well as cases where Chinese aid is more effective than Western aid. With these findings, I argue that …

Planning And Real-Time Resource Allocation In Freight Logistics Systems Utilizing Emerging Transportation Technologies, Darshan Rajesh Chauhan

Dissertations and Theses

Transportation is a key driver of any national economy. In the United States, the transportation sector contributes $1.3 trillion to the economy, of which freight transportation represents more than 50%. Trucks alone account for more than 70% freight movements in the United States. In addition to worsening stress at ports of entry and traffic congestion in the system, freight also accounts for nearly one-third of the greenhouse gas emissions in the United States. Emerging transportation technologies like electric unmanned aerial vehicles (or drones) and electric vehicles can provide a more sustainable alternative to combat greenhouse gas emissions and reduce the …

Examining Demographic And Environmental Factors In Predicting The Perceived Impact Of Cancer On Childhood And Adolescent Cancer Survivors, Nazan Cetin

Dissertations and Theses

Cancer survivors' perceptions on how cancer has impacted their lives has been identified as a "critical predictor" of psychosocial well-being and quality of life outcomes. Given the dramatic increase in survival rates and the long-term health and psychosocial challenges, as well as survivorship care barriers, this study focuses special attention on childhood and adolescent cancer survivors and is guided by Tedeschi and Calhoun's theory of posttraumatic growth and Hammond's theory of distinctiveness. This study aims to examine the influence of demographic (i.e., age at diagnosis, biological sex, race/ethnicity, type of cancer) and environmental factors (i.e., geographical location and insurance type), …

Development Of A Configurable Real-Time Event Detection Framework For Power Systems Using Swarm Intelligence Optimization, Umar Farooq

Dissertations and Theses

Modern power systems characterized by complex topologies require accurate situational awareness to maintain an adequate level of reliability. Since they are large and spread over wide geographical areas, occurrence of failures is inevitable in power systems. Various generation and transmission disturbances give rise to a mismatch between generation and demand, which manifest as frequency events. These events can take the form of negligible frequency deviations or more severe emergencies that can precipitate cascading outages, depending on the severity of the disturbance and efficacy of remedial action schema. The impacts of such events have become more critical with recent decline in …

Orthotrichum Lyellii As An Active Moss Biomonitor: Examining The Interplay Between Ambient Pm10, Bulk Deposition And Heavy Metals In An Urban Environment, Scott Bradley Kiel

Dissertations and Theses

The importance of monitoring and preventing pollution in the environment is a globally recognized issue. Of the criteria pollutants outlined by the United States Environmental Protection Agency, particulate matter is among these least understood in relation to toxicity and most wide-spread. Many governments have employed continuous air quality monitoring networks to track ambient levels of particulate matter, but are often too widespread to capture the heterogeneity of the urban environment, especially for heavy metal deposition. In Portland, OR, the epiphytic moss Orthotrichum lyellii was successfully used as a low-cost passive biomonitor to increase the spatial resolution of pollution around the …

Arbuscular Mycorrhizal Fungi Colonization Response To Dike Removal In The Salmon River Estuary, Elinore Webb

Dissertations and Theses

Arbuscular mycorrhizal fungi (AMF) form symbiotic relationships with wetland plants and are important to the restoration of coastal estuaries. The purpose of this study was to assess the presence and colonization of arbuscular mycorrhizal fungi in Distichlis spicata from three formerly diked areas of the Salmon River Estuary to determine an initial understanding of the mycorrhizal community in tidal wetlands post-restoration. AMF were present in all four sample areas and total colonization ranged on average 39-72%. The reference site had the lowest levels of total colonization, which is contrary to the findings of studies of younger wetland restorations. Most importantly, …

The Process Of Establishing A Blooming Chemistry Tool For Use In Undergraduate Chemistry Education And Research, Emryse Geye

Dissertations and Theses

While it is still common in college chemistry to assess student learning and skill with summative assessments, the CER community does not currently have a simple tool to determine and communicate whether an assessment is actually aligned with the outcomes of interest. In particular, as so-called evidence-based teaching practices and active learning strategies gain a foothold in college chemistry classrooms, the ability to communicate whether those (often labor-, cost-, and time-intensive) interventions are not only aligned with course outcomes, but also provide measurable benefit to students becomes more imperative. While college chemistry has made some strides in the area of …

Modeling And Analysing The Impact Of Heat Pump Water Heaters On Distribution Systems Using Gridlab-D, Midrar Adham

Dissertations and Theses

With the constant increase in energy demand, finding ways to reduce peak load and the energy-costs factors has become more imperative. Domestic water heating showcases a significant opportunity for such applications. Water heating is the second-highest energy consumer in the residential sector across the United States. Electric Water Heaters (EWHs), in particular, constitute nearly 43% of American household water heating energy consumption. Heat Pump Water Heater (HPWH), on the other hand, is an advanced water heating technology that has recently emerged in the United States residential market.

The objectives of this work are to develop a HPWH model and build …