Digital Commons Network^™

The Effect Of Docosahexaenoic Acid (Dha)-Containing Phosphatidylcholine (Pc) On Liquid-Ordered And Liquid-Disordered Coexistence, Yongwen Gu

Dissertations and Theses

Plasma membranes are essential to both the structure and function of mammalian cells. The first unifying paradigm of membrane structure, the Fluid Mosaic Model, is no longer considered adequate to describe the many non-homogeneous lipid structures that have been observed in both natural and model membranes over the past approximately thirty years. The field of membrane biophysics now appreciates that the complex mixture of different lipid species found in natural membranes produces a range of dynamic, laterally segregated, non-homogeneous structures which exist on time scales ranging from microseconds to minutes.

When sphingomyelin (SM), POPC and cholesterol are all present in …

Automatic Calibration Of Water Quality And Hydrodynamic Model (Ce-Qual-W2), Nasim Shojaei

Dissertations and Theses

One of the most important purposes of surface water resource management is to develop predictive models to assist in identifying and evaluating operational and structural measures for improving water quality. To better understand the effects of external and internal nutrient and organic loading and the effects of reservoir operation, a model is often developed, calibrated, and used for sensitivity and management simulations. The importance of modeling and simulation in the scientific community has drawn interest towards methods for automated calibration. This study addresses using an automatic technique to calibrate the water quality model CE-QUAL-W2 (Cole and Wells, 2013). CE-QUAL-W2 is …

Testing The Ecological And Physiological Factors Influencing Reproductive Success In Mosses, Erin Elizabeth Shortlidge

Dissertations and Theses

As non-vascular, early land plants with an aquatic ancestry, mosses do not regulate internal water conditions separate from that of their environment and as a result, evolved mechanisms to survive in a terrestrial world out of water. Yet, there is a widely accepted dogma that moss reproductive success is solely dependent on rainfall events carrying swimming, bi-flagellate sperm across the landscape to reproductively mature and receptive female mosses--but this classic view of moss reproduction may be too simplistic. In this dissertation I test the assumptions of reproductive limitation in mosses and present novel findings in a basal, yet understudied terrestrial …

Calcium Transport Inhibition, Stimulation, And Light Dependent Modulation Of The Skeletal Calcium Release Channel (Ryr1) By The Prototropic Forms Of Pelargonidin, Thomas Joseph Dornan

Dissertations and Theses

The principle calcium regulator in the muscle cell is the calcium ion release channel (RyR). Improper calcium homeostasis in the muscle cell is the foundation of many pathological states and has been targeted as a contributing factor to ventricular tachycardia, which is known to precede sudden cardiac arrest.

Numerous endogenous and exogenous compounds can affect the way RyR regulates calcium. In this study the anthocyanidin Pelargonidin (Pg), an important natural colorant and dietary antioxidant, is evaluated for its effect on regulating the transport of calcium through the RyR1 of skeletal muscle sarcoplasmic reticulum. Pelargonidin undergoes time dependent structural changes in …

Interpretable Machine Learning And Sparse Coding For Computer Vision, Will Landecker

Dissertations and Theses

Machine learning offers many powerful tools for prediction. One of these tools, the binary classifier, is often considered a black box. Although its predictions may be accurate, we might never know why the classifier made a particular prediction. In the first half of this dissertation, I review the state of the art of interpretable methods (methods for explaining why); after noting where the existing methods fall short, I propose a new method for a particular type of black box called additive networks. I offer a proof of trustworthiness for this new method (meaning a proof that my method does not …

Equality, Trust And Universalism In Europe, Canada And The United States: Implications For Health Care Policy, P. Christopher Palmedo

Dissertations and Theses

A number of theoretical explanations seek to describe the factors that have led to the position of the United States as the last industrialized Western nation without a universal health care program. Theories focus on institutional arrangement, historic precedent, and the influence of the private sector and market forces. This study explores another factor: the role of underlying social values. The research examines differences in values among ten European countries, the United States and Canada, and analyzes the associations between the values that have been seen to contribute the individualism-collectivism dynamic in the United States. The hypothesis that equality and …

Exploring Pedestrian Responsive Traffic Signal Timing Strategies In Urban Areas, Sirisha Murthy Kothuri

Dissertations and Theses

The role of walking in the development of healthy, livable communities is being increasingly recognized. In urban areas, intersections represent locations where different modes converge, and are often viewed as deterrents to walking. This is due to the unwarranted and often unnecessary delays imposed by signal timing policies for pedestrians and increased potential for conflicts. Traditional signal timing design prioritizes vehicles over pedestrians leading to undesirable consequences such as large delays and risky pedestrian behaviors. Pedestrians are accommodated in a manner that is designed to cause least interruption to the flow of motor vehicles. This lack of pedestrian accommodation at …

Beyond The Mcnair Program: A Comparative Study Of Mcnair Scholars' Understandings Of The Impacts Of Program Participation On Their Graduate School Experiences, Cristina Restad

Dissertations and Theses

The Ronald E. McNair Scholars Program is a U.S. Department of Education TRIO Program, funded at 152 institutions across the United States and Puerto Rico. In 2013, total funding reached over $35 million--of which, Portland State University received approximately $211,000 (US Department of Education, 2013). The program's goal is to introduce first-generation, low-income, under-represented group college students to effective strategies for succeeding in doctoral programs so they may become professors and create a more supportive environment for future non-traditional students. One way to explore program effectiveness beyond completion of the McNair Program is to ask the McNair Scholars themselves about …

The Orientation Of The Pyrococcus Furiosus Transcription Factor Tfb2 In The Transcription Initiation Complex, Arati Bhattarai

Dissertations and Theses

The hyperthermophile archaeon, Pyrococcus furiosus encodes two eukaryotic TFIIB family proteins, TFB1 and TFB2. TFB1 is very similar to TFIIB in terms of sequence homology and function, whereas TFB2 is unusual as it is missing highly conserved sequences in its N-terminal domain that are present in TFIIB and TFB1. Despite this, TFB2 is effective in transcription process, albeit with lower efficiency compared to TFB1. Other archaea also contain multiple TFBs, but unlike Pyrococcus furiosus TFB2, these multiple TFBs have higher sequence homology to each other and have similar transcription efficiencies. Photochemical cross-linking experiments have shown that the B-reader of TFB …

"Vitalité": Race Science And Jews In France 1850-1914, Kendra Beth Hendrickson

Dissertations and Theses

Race science is built on ideas of division and categorization. In the historian's quest to tell the story of race science, certain frameworks have been used that can greatly inhibit our understanding of this fraught topic. The impulse to study race science in the framework of the nation-state has led to certain misconceptions and lends itself to a historical narrative wherein racist concepts stop at artificially imposed borders. In addition, the national framework detracts from the individual's contributions and instead lumps these contributions together on the level of the nation-state, thus opening the door for judgments about whole nations being …

Advances In Aquatic Target Localization With Passive Sonar, John Thomas Gebbie

Dissertations and Theses

New underwater passive sonar techniques are developed for enhancing target localization capabilities in shallow ocean environments. The ocean surface and the seabed act as acoustic mirrors that reflect sound created by boats or subsurface vehicles, which gives rise to echoes that can be heard by hydrophone receivers (underwater microphones). The goal of this work is to leverage this "multipath" phenomenon in new ways to determine the origin of the sound, and thus the location of the target. However, this is difficult for propeller driven vehicles because the noise they produce is both random and continuous in time, which complicates its …

Bumps Along The Long And Winding Road: Factors Related To Truck Driver Turnover And Job-Induced Tension, Layla Rhiannon Mansfield

Dissertations and Theses

Voluntary turnover rates among truckload carriers are extremely high, ranging from 50% to more than 100% annually (Griffin & Kalnbach, 2002), furthermore, long-haul truck drivers operate in a stressor-filled environment, which exerts enormous adverse influence not only their well-being but also on their intent to quit. This study explores the relational aspects of the driver's work environment to highlight how the relationships that a driver has with their organization, supervisor, and dispatcher can explain turnover and job-induced tension. Drawing on Social Exchange Theory, Conservation of Resources Theory, and concepts from Hirschman's (1970) theoretical framework of Exit, Voice, and Loyalty, this …

Behavioral Observation And Paternal Investment Of Eastern Kingbirds At Malheur National Wildlife Refuge, Christopher Michael Chutter

Dissertations and Theses

We have been studying the population of Eastern Kingbirds breeding in riparian habitats in Malheur National Wildlife Refuge (eastern Oregon) since 2002. These efforts have created an ideal research environment wherein most adults in the population have been color banded and DNA sampled and, as part of other research projects, nearly all broods since 2003 have been paternity tested. I decided to use behavioral video recordings of parental nest behavior undertaken between 2003 and 2010 for two unrelated projects. First, I tested the effectiveness of video sampling nesting behavior (see below and chapter 2). Second, I tested whether male kingbirds …

The Impact Of Economic Integration Within The European Union As A Factor In Conflict Transformation And Peace-Building, John Umo Ette

Dissertations and Theses

This study examines economic integration within the European Union (EU) as a factor in conflict transformation and peace-building. European responses to causes of frequent conflicts and wars after the end of WWII focused on the search for peace, economic cooperation and prosperity. This thesis will focus on three elements: economic interdependence, the expansion of the free market, and economic integration. In-depth examination of these factors reveals that economic interdependence or the exchange of goods and services across inter-state and international boundaries only, is not sufficient to bring peace among states. Economic inter-dependence may reduce the impact of war, but cannot …

Probabilistic Analysis For Reliable Logic Circuits, Scott Blakely

Dissertations and Theses

Continued aggressive scaling of electronic technology poses obstacles for maintaining circuit reliability. To this end, analysis of reliability is of increasing importance. Large scale number of inputs and gates or correlations of failures render such analysis computationally complex. This paper presents an accurate framework for reliability analysis of logic circuits, while inherently handling reconvergent fan-out without additional complexity. Combinational circuits are modeled stochastically as Discrete-Time Markov Chains, where propagation of node logic levels and error probability distributions through circuitry are used to determine error probabilities at nodes in the circuit. Model construction is scalable, as it is done so on …

Beyond Black And White: An Examination Of Afrocentric Facial Features And Sex In Criminal Sentencing, Amanda Mae Petersen

Dissertations and Theses

Research on race and sentencing is increasingly moving beyond racial category analyses to include more subtle attributes such as skin tone and facial features. In keeping with this progression, this research examines the extent to which convicted offenders' Afrocentric facial features interact with sex in order to create longer criminal sentences for stereotypically Black males and females. A random sample of Black and White males and females currently serving prison sentences in the state of Oregon were selected for inclusion in the study. A preliminary regression analysis was run in order to determine the effect of broad racial category on …

Trauma-Informed Research And Planning: Understanding Government And Urban Native Community Partnerships To Addressing Substance-Exposed Pregnancies In Portland, Or, Amanda Mercier

Dissertations and Theses

In 2011, representatives from the Multnomah County Health Departments and several Native-serving organizations came together to address substance-exposed pregnancies among urban Native Americans in Portland, Oregon. From these partnerships, the Future Generations Collaborative was formed representing a significant shift toward community-led maternal child health research and planning. Additionally, the Future Generations Collaborative adopted a historical trauma-informed community based participatory research and planning process. This is particularly significant considering government agencies' role in colonization within Native communities. The purpose of this case study is to explore partnerships between government agencies and the Portland Native community within the Future Generations Collaborative. Given …

Complex Thermal Histories Of L Melt Breccias Nwa 5964 And Nwa 6580, Kristy Lee Schepker

Dissertations and Theses

To constrain the thermal histories of two complex L chondrite melt breccia samples (NWA 5964 and NWA 6580) we compare textures and chemical compositions of metal and sulfide to L melt rock (NWA 6454 and NWA 6579) and strongly shocked (shock stage S6) (NWA 4860) samples. The inferred thermal histories can be used to evaluate formation settings on the L chondrite parent body. The L melt samples probably formed as different melt units within warm but largely unmelted material relatively close to the surface of the parent body, and the same is true for the S6 sample, except it experienced …

Stress Analysis For Chip Scale Packages With Embedded Active Devices Under Thermal Cycling, Hyunwook Yeo

Dissertations and Theses

One of the main challenges in the electronics manufacturing and packaging development is how to integrate more functions inside the same or even smaller size. To meet the demand for higher integration, the interest toward passive and active component embedding has been increasing during the past few years. One of the main reasons for the growing interest toward embedded active components, in addition to demand for higher packaging density, is the need for better electrical performance of the component assemblies. However, it is little known how embedded IC and passives affect the reliability of IC packaging.

Solder joints have been …

Experimental Investigation Of Lateral Cyclic Behavior Of Wood-Based Screen-Grid Insulated Concrete Form Walls, John Stuart Garth

Dissertations and Theses

Insulated concrete forms (ICFs) are green building components that are primarily used for residential wall construction. Unlike most polystyrene based ICF variants, the Faswall ICFs used in these experiments were significantly denser because they were made from recycled wood particles and cement. The current design approach for structures constructed with this type of wall form only allows the designer to consider the contribution of the reinforced concrete cores. Previous research has shown that this approach may be conservative. This project experimentally evaluated the lateral structural response of these types of grid ICF walls under increasing amplitude of in-plane cyclic loading. …

System-Wide Performance Analysis For Virtualization, Deron Eugene Jensen

Dissertations and Theses

With the current trend in cloud computing and virtualization, more organizations are moving their systems from a physical host to a virtual server.

Although this can significantly reduce hardware, power, and administration costs, it can increase the cost of analyzing performance problems. With virtualization, there is an initial performance overhead, and as more virtual machines are added to a physical host the interference increases between various guest machines. When this interference occurs, a virtualized guest application may not perform as expected. There is little or no information to the virtual OS about the interference, and the current performance tools in …

Green Index: Integration Of Environmental Performance, Green Innovativeness And Financial Performance, Ilknur Mary Joy Nirmala Tekin

Dissertations and Theses

The integration of sustainability performance of companies is becoming increasingly important. The recent global requirements (i.e. the Kyoto Protocol) for significant reduction of the negative impact of companies on the environment over the next 6 years have been putting pressure on the companies, requiring them to lower the negative environmental impact of market performance. This requirement challenges the profitable growth of the companies' business functions, given the change needed for business operations to improve on their environmental impact.

In this dissertation a new corporate sustainability performance index, called: The Green Index, for measuring and assessing the integrated sustainability performance of …

A 3.6 Ghz Doherty Power Amplifier With A 40 Dbm Saturated Output Power Using Gan On Sic Hemt Devices, Bryant Baker

Dissertations and Theses

This manuscript describes the design, development, and implementation of a linear high efficiency power amplifier. The symmetrical Doherty power amplifier utilizes TriQuint's 2nd Generation Gallium Nitride (GaN) on Silicon Carbide (SiC) High Electron Mobility Transistor (HEMT) devices (T1G6001032-SM) for a specified design frequency of 3.6 GHz and saturated output power of 40 dBm. Advanced Design Systems (ADS) simulation software, in conjunction with Modelithic's active and passive device models, were used during the design process and will be evaluated against the final measured results. The use of these device models demonstrate a successful first-pass design, putting less dependence on classical load …

Community Level Impacts Associated With The Invasion Of English Ivy (Hedera Spp.) In Forest Park: A Look At The Impacts Of Ivy On Community Composition And Soil Moisture, Sara Rose Copp

Dissertations and Theses

Invasive species degrade ecosystems by altering natural processes and decreasing the abundance and diversity of native flora. Communities with major fluctuations in resource supply allow invasive species to exploit limiting resources making the community prone to invasion. In the Pacific Northwest, urban forests characterized with limited light and seasonally limited soil moisture are being dominated by nonnative English ivy (Hedera spp). Three observational studies were conducted in the Southern end of Forest Park within the Balch Creek Subwatershed in Portland, Oregon in order to understand 1) how English ivy changes over three growing seasons, 2) how the native …

Exploring Capability Maturity Models And Relevant Practices As Solutions Addressing It Service Offshoring Project Issues, Rosine Hanna Salman

Dissertations and Theses

Western countries' information technology and software intensive firms are increasingly producing software and IT services in developing countries. With this swift advancement in offshoring, there are many issues that can be investigated which will enable companies to maximize their benefits from offshoring. However, significant challenges can occur throughout the lifecycle of offshoring IT service projects that turn the potential benefits into losses. This research investigated CMM/CMMI best practices and their effects on managing and mitigating critical issues associated with offshore development.

Using a web based survey, data was collected from 451 Information Technology and software development firms in the US. …

Implications Of Local And Regional Food Systems: Toward A New Food Economy In Portland, Oregon, Michael Mercer Mertens

Dissertations and Theses

The local food movement in the Portland Metro Region of Oregon is as prevalent as anywhere in the Country. To a large degree this is driven by the Portland Metro area food culture and the diverse agricultural landscape present in the Willamette Valley and throughout the State. Portlanders demand local food and thus far the rural periphery has been able to provide it; driving a new food economy that has economic implications throughout the region. As this regional food economy emerges much attention has been focused on harnessing its power for economic development perpetuated by the belief that there exists …

Cultivating Common Ground? A Case Study Of A Community Garden Organization In Northeast Portland, Oregon, Bryan James Zinschlag

Dissertations and Theses

When it comes to the topic of environmental sustainability, most of us will readily agree that we face a litany of local and global environmental threats in the twenty-first century. As such, we would largely agree that the need to address climate change and other issues is urgent. Where this agreement tends to end, however, is on the question of whether this urgency is so great that we need not address issues of inequality and environmental justice when organizing sustainability efforts. Some are convinced that, because sustainability efforts are "saving the world for everyone", so to speak, issues of environmental …

Multi-Perspective Technology Assessment To Improve Decision Making: A Novel Approach Using Fuzzy Cognitive Mapping For A Large-Scale Transmission Line Upgrade, Richard Chad Sperry

Dissertations and Theses

The objective of the technology assessment (TA) process is to understand problematic and undesirable consequences from the development and application of technology. TA advocates for the engagement of technology experts and stakeholders to understand the effects of technology. However, TA is often criticized that the decision-making process is not transparent - leaving stakeholders wondering if their contributions were heard. Furthermore, the methods have limited capability for conducting tradeoff analysis between the organizational objectives and conflicting stakeholder perspectives that can result in unintended consequences. Finally, these methods are static making it difficult to update and reassess decision alternatives when new information …

Participation In Technology Standards Development: A Decision Model For The Information And Communications Technology Industry, Ramin Neshati

Dissertations and Theses

There is a dearth of decision-support models or frameworks to aid managers in the Information and Communications Technology (ICT) industry in uniformly assessing the key factors in the decision to standardize innovative technologies. Making the proper decision is consequential and potentially fraught with risks for the firm such as competitive exposure, high expenditures with inadequate returns, restrictive inbound or outbound patent licensing obligations, and related complications.

This study presents a framework to guide managers in the ICT industry in assessing the factors that inform the decision to participate in the development of technology standards. Using multi-criteria decision analysis and judgment …

Some Neglected Aspects Of The Rococo: Berkeley, Vico, And Rococo Style, Bennett Gilbert

Dissertations and Theses

The Rococo period in the arts, flourishing mainly from about 1710 to about 1750, was stylistically unified, but nevertheless its tremendous productivity and appeal throughout Occidental culture has proven difficult to explain. Having no contemporary theoretical literature, the Rococo is commonly taken to have been a final and degenerate form of the Baroque era or an extravagance arising from the supposed careless frivolity of the elites, including the intellectuals of the Enlightenment. Neither approach adequately accounts for Rococo style.

Naming the Rococo raises profound issues for understanding the relations between conception and production in historical terms. Against the many difficulties …