Digital Commons Network^™

Peers' Academic Coping As A Resource For Academic Engagement And Motivational Resilience In The First Year Of Middle School, Daniel Lee Grimes

Dissertations and Theses

Beginning middle school is a difficult transition for many young adolescents. Academic coping skills and the ability to exhibit motivational resilience in the face of potential academic adversity can contribute to the success with which students navigate this transition. Students' peer group affiliations are known to have the ability to contribute positively to students' academic engagement, motivation, and achievement at this time. The current study explores the potential of a student's peer group members' use of eleven ways of academic coping to affect the change in student academic engagement over the course of the first year of middle school. Data …

Detecting Geomorphic Change And Stream Channel Evolution On The Sandy River, Oregon, Using Lidar Following Dam Removal In 2007, Lowell Henry Anthony

Dissertations and Theses

Following the removal of Marmot Dam on the Sandy River, Oregon, several Lidar flights were flown over the area of the former reservoir. The resultant sequential DEMs permitted calculation of reach-scale volumetric erosion and aggradation following dam removal. This allows for change detection across the entire affected reach of the former impoundment rather than just at several cross sections. In the first year there was a net loss of blank sediment in the dewatered reach. Subsequent flights show continued degradation of 145,649 m³ as well as aggradation of 6,232 m³. Sediment transport reached quasi-equilibrium in 2012 with …

Life Satisfaction In Division Iaa And Division Iii Football Players, Krista Haunani Francisco

Dissertations and Theses

Level of life satisfaction is not something of which many sit down and take appraisal. However, levels of life satisfaction, especially low levels of life satisfaction, can have a direct effect on health. Low levels of life satisfaction cause an increase in self-reported stress. Inversely, high levels of stress cause a decrease in life satisfaction. This decrease in life satisfaction is associated with poor mental and physical health outcomes. A majority of student-athlete healthcare is centered around the physical aspects of health, with mental health just recently becoming a concern. It was apparent through the research for this study that …

Balancing Security, Performance And Deployability In Encrypted Search, David Joel Pouliot

Dissertations and Theses

Encryption is an important tool for protecting data, especially data stored in the cloud. However, standard encryption techniques prevent efficient search. Searchable encryption attempts to solve this issue, protecting the data while still providing search functionality. Retaining the ability to search comes at a cost of security, performance and/or utility.

An important practical aspect of utility is compatibility with legacy systems. Unfortunately, the efficient searchable encryption constructions that are compatible with these systems have been proven vulnerable to attack, even against weaker adversary models.

The goal of this work is to address this security problem inherent with efficient, legacy compatible …

Power Efficiency Enhancement And Linearization Techniques For Power Amplifiers In Wireless Communications, Haider Al-Kanan

Dissertations and Theses

Wireless communication systems require Power Amplifiers (PAs) for signal transmissions. The trade-off between power efficiency and nonlinear distortion in PAs degrades the communication performance. Thus, power efficiency and nonlinearity are two main concerns of operating PAs in communication systems. Nonlinear behavioral models are typically used to quantify and mitigate the distortion effects of PAs on communication systems. This dissertation presents an estimation approach for modeling and linearizing the PA Amplitude-to-Amplitude (AM/AM) nonlinearity using the design specifications of PAs, such as gain, the third-order intercept point, and 1dB compression point. Furthermore, an enhanced approach for modeling solid-state power amplifiers is developed …

Minimum Complexity Echo State Networks For Genome And Sequence Analysis, Christopher John Neighbor

Dissertations and Theses

Increasing viral illnesses threatens global human health and welfare. Due to the distribution of disease and the expense of diagnosis, it is of value to develop portable assays that can detect viral infections early. DNA molecular logic technology offers a portable detection method due to the versatility and stability of DNA and the potential of in situ computation.

Top-down engineering of these chemical logic networks can be difficult due to the difficulties of their implementation using DNA as a substrate. In this work echo state networks, a form of recurrent neural networks, were explored with the motivation that their implementation …

Migrant Health Policies In The European Union: A Comparative Policy Analysis, Jessica Joanne Currier

Dissertations and Theses

There is an undeniable relationship between migration and health. Despite the fact that the concept of health as a fundamental human right has been enshrined in numerous international and supranational policy instruments, health disparities between migrants and host nation populations persist. Inequities in health are perpetuated by several factors that include, but are not limited to, immigration status, lack of knowledge of health system access points, appropriateness of health care services, language barriers, and unique health profiles of migrants. The literature firmly positions migrants as a vulnerable population due to their collective risk of poor health outcomes in multiple areas. …

Medical Faculty Engagement In Curricular Revisions: An Inquiry Into Individual And Organizational Factors That Support Participation, Tomoko Tanikawa

Dissertations and Theses

In efforts to facilitate the education of highly qualified and best-prepared medical professionals, many medical schools are either planning for or engaging in curriculum revisions including a complete overhaul of the curricular structure, academic and medical content, and pedagogical delivery modalities. To be effective, such changes require faculty buy-in, participation, engagement, and innovation. Unfortunately, despite medical schools' efforts to support faculty involvement in curricular revision, a range of reactions exist, including resistance. Thus, understanding the interactions between individual faculty attitudes and behaviors toward organizational initiatives and structural support is critical in advancing the educational mission of medical schools. Based on …

Novel View Synthesis In Time And Space, Simon Niklaus

Dissertations and Theses

Novel view synthesis is a classic problem in computer vision. It refers to the generation of previously unseen views of a scene from a set of sparse input images taken from different viewpoints. One example of novel view synthesis is the interpolation of views in between the two images of a stereo camera. Another classic problem in computer vision is video frame interpolation, which is important for video processing. It refers to the generation of video frames in between existing ones and is commonly used to increase the frame rate of a video or to match the frame rate to …

Narrowing The Cognitive Distance Between Engineers And Customers: A Novel Approach, Based On Fuzzy Cognitive Mapping, Byung Sung Yoon

Dissertations and Theses

During concept development, product developers consider product users and their future experience, cost, development and manufacturing efficiency, product function/quality, and differentiation of the product in the market. Development teams often struggle to adequately address all of these considerations, due to the following reasons: (1) Differences in technological and experiential knowledge, methods used, and communication styles that make it difficult for customers/user, marketing, and engineering to communicate effectively. As a result, important factors may not be sufficiently considered. (2) Product design factors, including technological alternatives, functions, features, benefits, and customer value are interdependent: in some cases, customers are willing to sacrifice …

Paradigm Shifts In Large-Scale Educational Change: Uncovering The Oregon Education Investment Board's Theory Of Change-In-Action, Johanna Kathryn Blackford

Dissertations and Theses

Education system leaders and policymakers around the globe expend vast amounts of resources on educational reform efforts and despite positive intentions, most attempts to affect educational change fail to realize large-scale, sustainable, positive outcomes--yet some have. While it is widely acknowledged that no two systems' educational change journeys are the same, what is becoming clear is that there is significant similarity among the thinking or paradigms underpinning theories of change-in-action guiding positive large-scale system-wide reform. This research highlights four change paradigms and suggests that a collective learning paradigm guided by systems thinking represents the paradigm shift associated with successful large-scale …

Leveraging Eelectronic Health Records To Develop Cardiovascular Risk Profiles For Primary Prevention With Youth Living With Hiv In Multidisciplinary Adolescent Hiv Care Settings, Sitaji Gurung

Dissertations and Theses

Background: HIV infection has shown to be associated with increased risk for, and earlier occurrence of cardiovascular disease (CVD). Emerging evidence suggests that detectable viral load (VL) and CD4 ≤ 200 contribute substantially to increased risk of CVD. Cigarette smoking is prevalent in at least 40% of those with HIV, and significantly more common compared to the general population. As many as 33% of adolescents are overweight, and this excess weight leads to lipid abnormalities, and increases in metabolic syndrome. With the newer formulation of antiretroviral therapy (ART) agents available as a component of single tablet regimens (STR), it is …

Before And After The Storm: Interactions Between Tree-Fall Canopy Gaps, Plant Phenology, And Frugivorous Lemurs In Masoala National Park, Madagascar, Monica Sue Mogilewsky

Dissertations and Theses

Madagascar is one of Earth's top biodiversity hotspots, with 80% of life on the island considered endemic. Among the endemic species are lemurs, a diverse group of non-human primates. Unfortunately, Madagascar's diversity, including lemurs, is threatened by habitat degradation and loss. Despite intense anthropogenic pressure over the past 50 years, scientists have not detected any lemur extinctions during this period. Some researchers have proposed that lemurs' adaptations to natural disturbances have provided these taxa resiliency against anthropogenic disturbances. Certainly, Madagascar experiences an extreme disturbance regime: the island experiences an average of over three cyclones a year. These cyclones create numerous, …

Classifying Seabed Parameters From Normal Incidence Reflections: Model Comparison And Inversion Technique, Megan Frantz

Dissertations and Theses

As of the year 2019, only about five percent of the seafloor has been topologically mapped and classified for type (e.g., sand, silt, gravel). To rapidly survey the seabed from surface ships or underwater vehicles, acoustic remote sensing methods are needed. In this thesis, acoustic measurements and inverse modeling is investigated as a way to classify seabed type based on estimating parameters such as density, sound speed, and interface roughness. The method uses normal incident acoustic measurements that can be made using either a single beam echo sounder or the normal incident beams from a side scan sonar. The inverse …

Exploring How Community College Transfer Students Experience Connection In A Commuter University, Christa Michelle Zinke

Dissertations and Theses

Over the last 40 years, the expansion of the U.S. community college system resulted in a growing number of students choosing to begin their undergraduate education at a two-year institution and then transfer to a four-year institution. However, many students struggle to establish connection after transferring, especially if they transfer into a commuter university. For many college students, feelings of engagement and connection influence their persistence decisions. Using Tinto's (1975; 1993) and Astin's (1984) theories of student persistence as a framework, the purpose of this in-depth interview study is to explore how commuter community college students who transfer to Portland …

Modeling Spatiotemporal Patterns Of Pm2.5 At The Sub-Neighborhood Scale Using Low-Cost Sensor Networks, Philip Jeffrey Orlando

Dissertations and Theses

Epidemiological research has demonstrated an adverse relationship between fine particulate matter (PM_2.5) and human health. While PM_2.5 continues to pose a significant global health risk, there is still the need to further characterize exposures at the intra-urban scale. Land use regression is a statistical modeling technique which is used to predict air pollution concentrations at high resolution from a limited number of monitoring sites. However, the existing regulatory monitoring networks are typically not dense enough to apply these techniques. We explored the potential of using low-cost PM_2.5 sensor networks to overcome the limitations of the existing …

Optimal Boundary Detection Using Autonomous Mobile Sensors, Phillip Justin Kearns

Dissertations and Theses

A fundamental challenge to modern science and engineering is the ability to rapidly and accurately determine the spatial extent of environmental phenomena. In monitoring the spread of hazardous pollution, for example, all points with pollutant concentration above or below a fixed threshold can be considered as two classes in a binary classification problem. In this instance, the goal is to accurately estimate the decision boundary as quickly as possible. To generate models and predictions, scientists must choose their sampling locations from a vast array of possibilities. This thesis develops a policy for determining the optimal sample locations for a fixed …

Applications Of Triplet-Photosensitizers And Development Of Photochemical Methods, Luke V. Lutkus

Dissertations and Theses

Photochemistry focuses on various aspects of the interaction of light with molecules. This work entails new methodology for fundamental measurements of photochemistry along with novel applications of triplet-photosensitizers. Herein described are two separate methodologies developed for the determination of the quantum yield. A method for the singlet oxygen quantum yield was developed that utilizes the reaction between singlet oxygen and dimethyl sulfoxide (DMSO) to produce dimethyl sulfone. The rate of the reaction is measured by the pressure decrease that results from the consumption of oxygen from the headspace of a sealed system. It was found that the rate of pressure …

Undrained Cyclic Shear Resistance Of Low Plastic Silts, Rawan Almoumen

Dissertations and Theses

A magnitude 9 Cascadia Subduction Zone earthquake is expected to trigger widespread liquefaction in loose material in Oregon. The geotechnical engineering studies have determined that the Willamette Silts may be susceptible to liquefaction or cyclic softening, as their plasticity indices ranges between non-plastic to low plasticity. While the majority of past studies have focused on liquefaction of sand and cyclic behavior of clays, there is not enough data on the cyclic response behavior of silty soils and the liquefaction susceptibility of these soils. A research focus in the geotechnical engineering program at Portland State University revolves around is performing cyclic …

Characterization Of Inertial Particles In The Turbulent Wake Of A Porous Disk, Kristin Nichole Travis

Dissertations and Theses

This study presents the findings of a wind tunnel experiment investigating the behaviour of micrometric inertial particles in the turbulent wake of a stationary porous disk. Various concentrations [Φ_v ∈ (2.95 x 10^-6 - 1.22 x 10^-5)] of polydisperse water droplets (diameter 13-41 µm) are compared to sub-inertial tracer particles. Hot-wire anemometry, phase Doppler interferometry and particle image velocimetry were implemented in the near and far wake regions to study the complex dynamics of the particles. Turbulence statistics and particle size distributions are presented and used to explore the particle wake interaction.

The Optimization Of Machining Parameters For Milling Operations By Using The Nelder Mead Simplex Method, Yubin Lee

Dissertations and Theses

Machining operations need to be optimized to maximize profit for computer numerical control (CNC) machines. Although minimum production time could mean high productivity, it can not guarantee maximum profit rate in CNC milling operations. The possible range of machining parameters is limited by several constraints, such as maximum machine power, surface finish requirements, and maximum cutting force for the stability of milling operations. Among CNC machining parameters, cutting speed and feed have the greatest effect on machining operations. Therefore, cutting speed and feed are considered as main process variables to maximize the profit rate of CNC milling operations.

A variety …

Rebranding Empire: Consumers, Commodities, And The Empire Marketing Board, 1926-1933, Ashley Kristen Bower

Dissertations and Theses

The Empire Marketing Board (EMB) was a British government organization established in 1926 by the Conservative Party, under the authority of Colonial Secretary Leopold Amery. Its goal was to encourage Britons to "Buy Empire," namely, to buy products from the Dominions and colonies of the British Empire. To encourage consumption, the EMB funded scientific research and economic analyses, as well as publicity for Empire trade in the form of posters, films, educational materials, and government-sponsored events. The Empire Marketing Board attempted to sell the concept of "Empire" to the masses as a new cooperative project which stressed the value of …

Led Down The Garden Path: Cognitive Processing Of English Language Idioms, Daniel Alan Vandehey

Dissertations and Theses

The discourse community surrounding the study of idioms often disagree regarding the proper classification of idioms. Some scholars believe that the figurative meaning of many idioms cannot be determined through the deconstruction of their lexical parts, and therefore should be classified as an irreducible lexical unit. Others believe that even though the figurative meaning of some idioms are obscured, people process these opaque idioms as they would a metaphor, constructing meaning through an integration process that includes the component pieces of the idiom, the surrounding context, and the message receiver's knowledge network. This study forwards research concerning whether idioms should …

Competing Narratives: The Struggle For The Soul Of Egypt, Ahmed El Mansouri

Dissertations and Theses

In January 2011, Egypt witnessed an uprising against ex-military president Hosni Mubarak, which resulted in his removal after ruling Egypt for thirty years. Yet, while the revolution targeted Mubarak, it also targeted to end the era of military rule, which started in 1952 with President Gamal Abdel Nasser, then was passed down to Anwar Sadat in 1970 and later to Hosni Mubarak in 1981. Thereafter, dissatisfied with existing national policies, political leaders and revolutionaries battled to redefine Egyptian national identity by contesting the writing of a new Egyptian constitution. The debates over the constitution exhibited an ample of destructive communication …

Geochemical Response To Thermal Energy Storage In The Columbia River Basalt Aquifer System Beneath The Portland Basin, Oregon, Ellen Elizabeth Svadlenak

Dissertations and Theses

Deep direct use thermal energy storage (TES) is a low carbon emission method of geothermal energy storage and supply for large-scale residential, commercial, and manufacturing heating and cooling. The process entails repeated cycles of hot- or cold-water injection, storage, and extraction from slow groundwater flow zones within the deeper layers of an aquifer system. Though a promising technology, TES cycles may increase mineral dissolution and precipitation reactions, particularly at elevated temperatures. The ensuing mass transfer can form scale in heat exchange systems and alter aquifer porosity and permeability, processes that can reduce the operational efficiency of a TES system.

Within …

Crania Japonica: Ethnographic Portraiture, Scientific Discourse, And The Fashioning Of Ainu/Japanese Colonial Identities, Jeffrey Braytenbah

Dissertations and Theses

Japan's colonial activities on the island of Hokkaido were instrumental to the creation of modern Japanese national identity. Within this construction, the indigenous Ainu people came to be seen in dialectical opposition to the 'modern' and 'civilized' identity that Japanese colonial actors fashioned for themselves. This process was articulated through travel literature, ethnographic portraiture, and discourse in scientific racism which racialized perceived divisions between the Ainu and Japanese and contributed to the unmaking of the Ainu homeland: Ainu Mosir. The resulting narrative was used to legitimize Japanese imperialism, transforming the Empire of Japan into the only non-Western member state …

Glacial Meltwater Modeling To Simulate Lake Water Budget (1996-2013) In Taylor Valley, Antarctica, Julian Michael Cross

Dissertations and Theses

The McMurdo Dry Valleys (MDV), the largest ice-free region (4,500 km²) in Antarctica, are a polar desert with an average annual temperature of -18ºC. In Taylor Valley, one of the MDV, closed-basin, perennially ice-covered lakes occupy the valley floor. Their water balance is controlled by inflow from glacial meltwater runoff and loss due to sublimation, making them sensitive indicators of climate. In this study, a physically-based model of glacier meltwater and lake ice sublimation is adapted to explain modern (1996 to 2013) lake-level variations. Meltwater model results were improved by the inclusion of MODIS remotely-sensed albedo measurements (E …

Robust Maximum Flow Network Interdiction Problem, Darshan Rajesh Chauhan

Dissertations and Theses

In this thesis, a maximum flow-based network interdiction problem considering uncertainties in arc capacities and interdiction resource consumption is solved. The problem consists of two entities with opposing objectives: the goal of the adversary is to maximize the flow of illicit drugs through the network, while the goal of the interdictor is to minimize the maximum flow by completely interdicting arcs given a specified amount of resources. Lack of complete information about the usage patterns of the transportation network by the adversary results in an uncertain estimate of arc capacity and resources required for interdiction by the interdictor. To account …

The Miseducation Of Marianne Dashwood: Jane Austen’S Politicization Of Sentimental Discourse, Kevin Frazelis

Dissertations and Theses

Examining the love triangle between Marianne Dashwood, Colonel Brandon, and John Willoughby provides new insight into how Austen decided to politicize the notion of the novel to demonstrate the inherent flaw in how sentimental novels to depicted romances bared a threat to women. I work against the conventional opposition of "good" versions of masculinity versus "poor" versions to posit a notion that instead, most masculinities are unstable and a detriment to the fairer sex. In this essay, I will argue that Sense and Sensibility disclose Austen's anxieties regarding sentimentalism because, from this perspective, Marianne Dashwood's character arc illustrates the author's …

Novel Hepatitis C Virus (Hcv) Community Viral Load Measures, Hcv Incidence And Prevalence, And Hcv Prevention By Methadone Maintenance, Ashly E. Jordan

Dissertations and Theses

Abstract

Introduction

The incidence of Hepatitis C virus (HCV) infection has increased in the current opioid epidemic in the United States; current estimates are that 2-3 million Americans have HCV infection. The ongoing and increasing HCV epidemic among people who use drugs (PWUD) is occurring in the context of known HCV prevention and highly efficacious and well-tolerated curative HCV treatment. The development of direct acting antivirals (DAAs) with cure rates approaching 100% dramatically changed the treatment landscape. This provides both the potential for improved individual- and population-level treatment effectiveness, and also the potential for population-level HCV ‘cure as prevention' (CasP) …