Digital Commons Network^™

Scalable Equivalence Checking For Behavioral Synthesis, Zhenkun Yang

Dissertations and Theses

Behavioral synthesis is the process of compiling an Electronic System Level (ESL) design to a register-transfer level (RTL) implementation. ESL specifications define the design functionality at a high level of abstraction (e.g., with C/C++ or SystemC), and thus provide a promising approach to address the exacting demands to develop feature-rich, optimized, and complex hardware systems within aggressive time-to-market schedules. Behavioral synthesis entails application of complex and error-prone transformations during the compilation process. Therefore, the adoption of behavioral synthesis highly depends on our ability to ensure that the synthesized RTL conforms to the ESL description. This dissertation provides an end-to-end scalable …

Investigating The Impact Of Sibling Foster Care On Placement Stability, Jeffrey David Waid

Dissertations and Theses

Sibling relationships are an important, yet under investigated aspect of foster care research. Despite the fact that between 65-85% of children in care have brothers and sisters, only recently have child welfare researchers begun to explore the complex and dynamic nature of sibling relationships in substitute care settings. Although cross-sectional and longitudinal studies suggest differences in placement stability and permanency outcomes for siblings placed together versus those placed separately, the conditions under which sibling relationships influence placement stability, permanency, and well-being in foster care settings remain unknown.

This dissertation investigated how family dynamics and home setting characteristics influenced the likelihood …

Non-Steroidal Anti-Inflammatory Drug Use In Collegiate Athletes, Brian Robert Davis

Dissertations and Theses

Non-steroidal anti-inflammatory drugs (NSAID) are a class of medications used in the treatment of pain, inflammation, and illness. These medications are common, affordable, and easy to access. For these reasons, NSAIDs are commonly used by athletes of all backgrounds for treating injuries and as ergogenic aids. However, despite these behaviors, NSAIDs have well-documented side effects and the efficacious nature of these medications has been brought into question. Despite this, many athletes continue to use these medications frequently and indiscriminately. It is not known why athletes use these medications in light of their questionable effectiveness and cited adverse effects. Therefore, this …

An Examination Of Factors That Catalyze Lgbtq Movements In Middle Eastern And North African Authoritarian Regimes, Michael Anthony Figueredo

Dissertations and Theses

Citizens' increased access to the internet is transforming political landscapes across the globe. The implications for civil society, culture, religion, governmental legitimacy and accountability are vast. In nations where one does not typically expect "modern" or egalitarian ideals to be prevalent among highly religious and conservative populations, those with motivations to unite around socially and culturally taboo causes are no longer forced to silently acquiesce and accept the status quo. The internet has proven to be an invaluable tool for those aiming to engage in social activism, as it allows citizens in highly oppressive authoritarian regimes to covertly mobilize and …

Ninth Grade Student Responses To Authentic Science Instruction, Michael Steven Ellison

Dissertations and Theses

This mixed methods case study documents an effort to implement authentic science and engineering instruction in one teacher's ninth grade science classrooms in a science-focused public school. The research framework and methodology is a derivative of work developed and reported by Newmann and others (Newmann & Associates, 1996). Based on a working definition of authenticity, data were collected for eight months on the authenticity in the experienced teacher's pedagogy and in student performance. Authenticity was defined as the degree to which a classroom lesson, an assessment task, or an example of student performance demonstrates construction of knowledge through use of …

Leadership And Decision-Making Skills Of High Poverty Elementary School Principals In An Era Of Reduced Resources, Kevin Eugene Spooner

Dissertations and Theses

Recently, a great deal of interest has been generated around the role of principal and its effectiveness, especially its impact on improving teacher instruction and student learning. Waters, Marzano, and McNulty (2003) concluded that one quarter of all "school effects" on achievement can be attributed to principals. While there is general agreement on the principal's importance and affect, do we understand how principals have adapted to changes in schools with reduced resources and increased learning needs of students? How have principals made decisions in an environment where resources have been reduced over time? Given the stories of retired principals from …

A Spline Framework For Optimal Representation Of Semiperiodic Signals, Farzin G. Guilak

Dissertations and Theses

Semiperiodic signals possess an underlying periodicity, but their constituent spectral components include stochastic elements which make it impossible to analytically determine locations of the signal's critical points. Mathematically, a signal's critical points are those at which it is not differentiable or where its derivative is zero. In some domains they represent characteristic points, which are locations indicating important changes in the underlying process reflected by the signal.

For many applications in healthcare, knowledge of precise locations of these points provides key insight for analytic, diagnostic, and therapeutic purposes. For example, given an appropriate signal they might indicate the start or …

Characterization, Dna Binding And Cleavage Activities Of New Prodigiosin And Tambjamine Analogues And Their Cu²⁺ And Zn²⁺ Complexes, Karen Chichetu

Dissertations and Theses

Prodigiosins and tambjamines are natural compounds from bacterial and marine sources belonging to a family containing a common 4-methoxy-2,2'-bipyrrole core. These compounds have received a lot of interest due to their promising biological activities. Studies have suggested DNA as a potential therapeutic target for the natural prodigiosin and tambjamine due to their ability to facilitate oxidative DNA cleavage in the presence of Cu²⁺. Based on this we sought to study the metal binding activity of new prodigiosin and tambjamine analogues. A new prodigiosin analogue was synthesized and complexed with Cu²⁺. This revealed 1:1 complex formation between …

Pseudocapacitors For Energy Storage, Anuradha Venkataraman

Dissertations and Theses

Fluctuation in the demand for electrical power and the intermittent nature of the supply of energy from renewable sources like solar and wind have made the need for energy storage a dire necessity. Current storage technologies like batteries and supercapacitors fall short either in terms of power output or in their ability to store sufficient energy. Pseudocapacitors combine features of both and offer an alternative to stabilize the power supply. They possess high rates of charge and discharge and are capable of storing much more energy in comparison to a supercapacitor. In the quest for solutions that are economical and …

Novel Cryptographic Primitives And Protocols For Censorship Resistance, Kevin Patrick Dyer

Dissertations and Theses

Internet users rely on the availability of websites and digital services to engage in political discussions, report on newsworthy events in real-time, watch videos, etc. However, sometimes those who control networks, such as governments, censor certain websites, block specific applications or throttle encrypted traffic. Understandably, when users are faced with egregious censorship, where certain websites or applications are banned, they seek reliable and efficient means to circumvent such blocks. This tension is evident in countries such as a Iran and China, where the Internet censorship infrastructure is pervasive and continues to increase in scope and effectiveness.

An arms race is …

Steps Towards Deciphering The Post-Polyketide Synthase Tailoring Steps In The Phoslactomycin Biosynthesis Pathway, Patience Marimo

Dissertations and Theses

Phoslactomycins (PLMs) are a group of natural products belonging to a polyketides class. These polyketides are synthesized by sequential reaction catalyzed by a collection of enzymes activities called polyketide synthases. A polyketide is a large class of diverse compounds that are characterized by more than two carbonyl groups connected by single intervening carbon atoms. In other words, a polyketide is a polymer whose monomer is a ketide. The PLMs are also known as phosphazomycins or phospholines. These compounds were isolated based on antifungal and antitumor activities. This array of promising biological activities has stimulated research into the field of PLMs …

A Multivariate Modeling Approach For Generating Ensemble Climatology Forcing For Hydrologic Applications, Sepideh Khajehei

Dissertations and Theses

Reliability and accuracy of the forcing data plays a vital role in the Hydrological Streamflow Prediction. Reliability of the forcing data leads to accurate predictions and ultimately reduction of uncertainty. Currently, Numerical Weather Prediction (NWP) models are developing ensemble forecasts for various temporal and spatial scales. However, it is proven that the raw products of the NWP models may be biased at the basin scale; unlike model grid scale, depending on the size of the catchment. Due to the large space-time variability of precipitation, bias-correcting the ensemble forecasts has proven to be a challenging task. In recent years, Ensemble Pre-Processing …

Multivalent Rechargeable Batteries, Sudhaprasanna Kumar Padigi

Dissertations and Theses

Li⁺ ion batteries have been the mainstay of high energy storage devices that have revolutionized the operating life time of consumer electronic devices for the past two decades. However, there is a steady increase in demand for energy storage devices with the ability to store more energy and deliver them at high power at low cost, without comprising safety and lifetime.

Li-ion batteries have had significant challenges in increasing the amount of stored energy without affecting the overall lifetime and the ability to deliver stored energy. In order to store and deliver more energy, more lithium ions need to …

Evaluating Global Sensitivity Analysis Methods For Hydrologic Modeling Over The Columbia River Basin, Maysoun Ayad Hameed

Dissertations and Theses

Global Sensitivity Analysis (GSA) approach helps to identify the effectiveness of model parameters or inputs and thus provides essential information about the model performance. The effects of 14 parameters and one input (forcing data) of the Sacramento Soil Moisture Accounting (SAC-SMA) model are analyzed by using two GSA methods: Sobol' and Fourier Amplitude Sensitivity Test (FAST). The simulations are carried out over five sub-basins within the Columbia River Basin (CRB) for three different periods: one-year, four-year, and seven-year. The main parameter sensitivities (first-order) and the interactions sensitivities (second-order) are evaluated in this study. Our results show that some hydrological processes …

A Critical Race Analysis Of Travel For Transformation: Pedagogy For The Privileged Or Vehicle For Socio-Cultural Transformation?, James Arthur Gambrell

Dissertations and Theses

Transformative learning theory (TLT) describes the process of reframing discriminative, untenable worldviews with a more inclusive, permeable, and reflective epistemology. Although TLT has been around for more than 50 years, few studies empirically engage critical theoretical frameworks to move beyond personal learning to identify the impacts of transformation on society. Through a critical race theory (CRT) framework, this study analyzed how the participants' socio-cultural identities (race, class, gender, sexuality, and heritage language) impacted the transformative learning of eight study-abroad students from a medium-sized, rural Midwestern university. Focusing on the extent to which the participants experienced the elements of transformative …

The Role Of Environmental Dynamics In The Emergence Of Autocatalytic Networks, Joe Fusion

Dissertations and Theses

For life to arise from non-life, a metabolism must emerge and maintain itself, distinct from its environment. One line of research seeking to understand this emergence has focused on models of autocatalytic reaction networks (ARNs) and the conditions that allow them to approximate metabolic behavior. These models have identified reaction parameters from which a proto-metabolism might emerge given an adequate matter-energy flow through the system. This dissertation extends that research by answering the question: can dynamically structured interactions with the environment promote the emergence of ARNs? This question was inspired by theories that place the origin of life in contexts …

Naturally Occurring Background Levels Of Arsenic In The Soils Of Southwestern Oregon, Heather Ann Hurtado

Dissertations and Theses

This study examines the natural background concentrations of arsenic in the soils of southwest Oregon, using new samples in addition to data collected from previous theses (Khandoker, 1997 and Douglas, 1999). The original 213 samples were run by ICP-AES with a reporting limit of 20 ppm, and only three samples had detected values. The original samples were tested again (2013) at a lower reporting limit of 0.2 ppm by ICP-MS, as were 42 new samples (2013), to better ascertain the natural levels of arsenic in undisturbed soils. The aim is to add to the existing DEQ data set, which has …

Defining The Terroir Of The Columbia Gorge Wine Region, Oregon And Washington, Usa Using Geographic Information Systems (Gis), Hilary Whitney

Dissertations and Theses

The Columbia Gorge Wine Region (CGWR) is an emerging wine producing area that extends for about 100km along the Columbia River in Oregon and Washington State in which the number of vineyards, wineries and physical terroir conditions have yet to be defined. To better understand the physical factors affecting Oregon and Washington wine, this project analyzes climate, topography, geology and soil at vineyards in the CGWR. This was accomplished using Geographic Information Systems, existing earth science databases and field work. The region, which includes the Columbia Gorge American Viticulture Area (AVA) and the southwest portion of the Columbia Valley AVA, …

Jews, Sports, Gender, And The Rose City : An Analysis Of Jewish Involvement With Athletics In Portland, Oregon, 1900-1940, Kelli Ann Tusow

Dissertations and Theses

The subject of Jews in sports is often times perceived as an oxymoronic research topic given the ethnic stereotypes that Jews are physically weak, unfit, and more focused on intellectual pursuits. However, Jews have had a long history and in-depth interaction with sports that is important to understand, not only to expand our perception of the Jewish people, but also to realize the important role sports play in social historiography. While the Jewish population of East Coast America and their involvement in athletics has been studied to some extent, the West Coast population, in particular, the Northwest, has been sorely …

The Multilevel Effects Of Supervisor Adaptability On Training Effectiveness And Employee Job Satisfaction, Joseph Alvin Sherwood

Dissertations and Theses

The present study explored the multilevel effects of supervisor learning adaptability on training effectiveness, and post-training employee job satisfaction in a work-family and safety-based intervention aimed at increasing family supportive supervisor behaviors (FSSB) and safety behaviors. Using a sample of 291 municipal public works field workers from two independent organizations, it was hypothesized that supervisor adaptability positively relates to post-training FSSB and employee job satisfaction. Specifically, it was hypothesized that learning adaptability prepares those supervisors to be more inclined to engage actively in training, thereby increasing employee reported FSSBs more significantly for those supervisors and leading to intervention target results, …

Therapy And The Nontraditional Transgender Narrative, Dylan Ellingson Waller

Dissertations and Theses

The history of transgender identity is inextricable from the mental health industry. Since the late 1970's transgender people have required permission from mental health professionals to make medical modifications to their sex characteristics. During the time of this research, it was difficult for transgender individuals to receive the hormones or surgeries they desire without first being diagnosed with Gender Identity Disorder (GID).

This study applies labeling theory to the label of GID. Labeling theory poses that if an individual is labeled with a mental illness, they will either reject or accept the label. Acceptance of the mentally ill label will …

Time-Variant Load Models Of Electric Vehicle Chargers, Nicole P. Zimmerman

Dissertations and Theses

In power distribution system planning, it is essential to understand the impacts that electric vehicles (EVs), and the non-linear, time-variant loading profiles associated with their charging units, may have on power distribution networks. This research presents a design methodology for the creation of both analytical and behavioral models for EV charging units within a VHDL-AMS simulation environment.

Voltage and current data collected from Electric Avenue, located on the Portland State University campus, were used to create harmonic profiles of the EV charging units at the site. From these profiles, generalized models for both single-phase (Level 2) and three-phase (Level 3) …

Focus On A Stem, Based In Place, Watershed Curriculum: A Confluence Of Stormwater, Humans, Knowledge, Attitudes, And Skills, Lecia Molineux Schall

Dissertations and Theses

This case study investigated the potential of a place-based watershed curriculum, using STEM principles, to increase watershed literacy and knowledge of human impacts on stormwater in the environment. A secondary goal was to examine whether the place-based connection and increased exposure to issues within their local watershed impacted the students' environmental attitudes and sense of place. Over 500 sixth graders participated in this localized curriculum, where they learned the science behind watershed issues on their own school campuses. They focused on ways humans can monitor and mitigate their impacts on stormwater, through engineering investigations. The mixed-method research study investigated the …

Device, Method, And Algorithm To Assess Changes In Cardiac Output Via Intracardiac Impedance Monitoring, Geoffrey Fredrick Schau

Dissertations and Theses

Cardiac output, the volume of blood pumped by the heart over time, is a powerful clinical metric used by physicians to assess overall cardiac health and patient well-being. However, current cardiac output estimation methods are typically invasive, time-consuming, expensive, or some combination of all three. Patients that receive artificial cardiac pacemaker devices are particularly susceptible to cardiac dysfunction and often require long-term cardiac monitoring support.

This thesis proposes a novel cardiac output monitoring solution which leverages an implantable intracardiac medical device. The principles of traditional impedance cardiography, an established cardiac output monitoring technique in practice for over fifty years, have …

Improved Gain Stability Of A Digital Imager Using A Charge Feedback Amplifier, Elliot Eckman Mylott

Dissertations and Theses

Digital imagers including Charge-Coupled Devices (CCD) are essential to most forms of modern photographic technologies. The quality of the data produced by digital imagers have made them an invaluable scientific measurement tool. Despite the numerous advantages of digital imagers, there are still factors that limit their performance. One such factor is the stability of the camera's gain, the ratio that dictates the imager's ability to convert incident photons to a measurable output voltage. Variations in gain can affect the linearity of the device and produce inaccurate measurements.

One of the factors that determines the gain of the camera is the …

Nationalism In United States Foreign Policy In The Post 9/11 Era, Chris W. Baum

Dissertations and Theses

One year after the terror attacks of September 11, 2001, the administration of President George W. Bush introduced a revolutionary foreign policy strategy--the Bush Doctrine. Proponents of this strategy advocated the use of American 'hard power' as a tool to promote freedom and democracy, beginning with the invasions of Afghanistan and Iraq. Opponents of the doctrine saw it as dangerously nationalistic, with the potential to entangle the United States in a myriad of protracted international conflicts. This thesis will identify aspects of nationalism within post-9/11 American foreign policy and illuminate the incompatibility of nationalism and the fundamental tenets of conflict …

Empowering All Who Teach: A Portrait Of Two Non-Native English Speaking Teachers In A Globalized 21st Century, Rosa Dene David

Dissertations and Theses

One of most prevalent issues surrounding English education internationally is the differentiation between Native English-Speaking Teachers (NESTs) and Non-native English-Speaking Teachers (NNESTs). What is sometimes termed the "Native speaker fallacy" is the notion that in order to be a proficient teacher of the English language one must either be a native speaker or possess native like fluency (Phillipson, 1992). This position is furthered by Hollidays Native Speakerism (Holliday, 2006) which suggests that within the field of English Language Teaching (ELT) there is an assumption that NESTs are better equipped to teach English language learners due to language proficiency and Western …

Investigations Of Larval Pacific Lamprey Entosphenus Tridentatus Osmotic Stress Tolerance And Occurrence In A Tidally-Influenced Estuarine Stream, Gregory Shell Silver

Dissertations and Theses

Pacific lamprey is a culturally valuable species to indigenous people, and has significant ecological importance in freshwater and marine ecosystems. Over the past several decades, constrictions in range and reductions in Pacific lamprey abundance have been observed in Western North America, and may be indicators of range-wide declines. In the face of declining populations, the U.S. Fish and Wildlife Service has partnered with tribal, state, federal, and local entities to implement a regional Pacific lamprey conservation agreement aimed at reducing threats to Pacific lamprey and improving their habitats and population status. Research needs identified in the conservation agreement include assessing …

Investigations Of The Air-Water Interface: A Structural Analysis Of Metallic Surface Films And Aquatic Surface Films By Comparative Microscopy, Randall William Smith

Dissertations and Theses

The air-water interface is an important natural boundary layer that has been neglected as an area of environmental field research. This study establishes that comparative microscopy can be an effective environmental method, and establishes that the term metallic surface films, is a more accurate descriptor than iron oxide surface films. This research shows that surface films are complex, often with layered structure, serve as habitat for significant biota, and act as a point of mineralization to several transition metal elements including manganese, iron, copper, nickel and zinc. This study demonstrates that surface films form under several conditions and can have …

Localized Ecological And Educational Effects Of Environmental Service-Learning In Portland, Oregon, Steven Matthew Braun

Dissertations and Theses

Environmental service-learning is an intentional educational experience(s) wherein learners engage in meaningful activities designed to serve the environment. Environmental service-learning activities vary according to their learning and service goals and include ecomanagement, persuasion, legal action, economic action and political action. The purpose of this mixed methods research was to explore the ecological and educational impacts of grades 6-12 environmental education, with special attention to environmental service-learning throughout Portland, Oregon.

Ecological impacts considered restoration and conservation outcomes of several environmental service-learning programs including plant communities, soils, litter removal and trail maintenance. Educational outcomes considered aspects of environmental literacy including locus of …