Digital Commons Network^™

System Dynamics Modeling For Traumatic Brain Injury: Mini-Review Of Applications, Erin S. Kenzie, Elle L. Parks, Nancy Carney, Wayne Wakeland

Complex Systems Faculty Publications and Presentations

Traumatic brain injury (TBI) is a highly complex phenomenon involving a cascade of disruptions across biomechanical, neurochemical, neurological, cognitive, emotional, and social systems. Researchers and clinicians urgently need a rigorous conceptualization of brain injury that encompasses nonlinear and mutually causal relations among the factors involved, as well as sources of individual variation in recovery trajectories. System dynamics, an approach from systems science, has been used for decades in fields such as management and ecology to model nonlinear feedback dynamics in complex systems. In this mini-review, we summarize some recent uses of this approach to better understand acute injury mechanisms, recovery …

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 …

The Intersectionality Of Stuttering And Aging, Mary Elizabeth Herring

University Honors Theses

The purpose of this study is to explore relationships between stuttering and aging so that speech-language pathologists can be informed about the intersectionality of these identities.

Three adult men who stutter, all over the age of 65, were interviewed in semi-structured interviews. Interview transcripts were analyzed with in-vivo coding to find codes and themes between participants. From the interviews, 20 categories were identified. These categories were then funneled into four overarching themes: 1) Personal factors impacted by stuttering, 2) Stuttering perspectives across the lifespan, 3) Stuttering therapy experiences, and 4) Covert stuttering.

This study shows that attitudes, perspectives, and experiences …

On Epidemiology As Racial-Capitalist (Re)Colonization And Epistemic Violence, Ryan J. Petteway

OHSU-PSU School of Public Health Faculty Publications and Presentations

This commentary reflects upon power-knowledge dynamics and matters of epistemic, procedural, and distributive justice that undergird epidemiological knowledge production related to racial health inequities in the U.S. Grounded in Foucault’s power-knowledge concepts—“objects”, “ritual”, and “the privileged”—and guided by Black feminist philosopher Kristie Dotson’s conceptualization of epistemic violence, it critiques the dominant positivist, reductionist, and extractivist paradigm of epidemiology, interrogating the settler-colonial and racial-capitalist nature of the knowledge production/curation enterprise. The commentary challenges epidemiology’s affinity for epistemological, procedural, and methodological norms that effectively silence/erase community knowledge(s) and nuance in favor of reductionist empirical representations/re-presentations produced by researchers who, often, have never …

The Impact Of The Covid-19 Pandemic On Mental Health And Stressors Among Asian American And Pacific Islanders, Ava Lu Kupperman

University Honors Theses

The Asian American and Pacific Islander (AAPI) community, along with the rest of the population globally, has been facing disruptions emerging from the COVID-19 pandemic in all parts of life. However, with the significant rise in racism, the AAPI community has had to confront a set of new challenges in their lives. Utilizing studies and literature written over the course of the pandemic, the purpose of this literature review is to examine the impacts observed on mental health outcomes among AAPIs as a result of the COVID-19 pandemic. This paper aims to collect and present information surrounding the impact on …

Examining Emergency Citizen Response To The Covid-19 Pandemic: Emergent Groups Addressing Food Insecurity In Portland, Oregon, Aliza Ruth Tuttle

Dissertations and Theses

Emergency response agencies commonly focus on how hard infrastructure will interact with extreme climatic and geologic events: bridges during an earthquake and buildings following a tornado, for example. Peoples' actual experience of these extreme events vary, however, based on socially constructed consequences of natural hazard events and their interaction with a depleted or robust social safety net.

Previous research shows people living with depleted social safety nets and who experience a natural hazard event are likely to help where they see disaster. Individuals consistently form groups, called emergent groups, to organize their efforts. This research explored emergent groups that formed …

Measurement Of Enantiomer Percentages For Five Monoterpenes From Six Conifer Species By Cartridge-Tube-Based Passive Sampling Adsorption–Thermal Desorption (Ps-Atd), Ying Wang, Wentai Luo, Todd Rosenstiel, James F. Pankow

Civil and Environmental Engineering Faculty Publications and Presentations

Many monoterpenes have at least two different stereochemical forms, and many biosynthetic pathways are known to favor one product over the other(s). A rapid method was developed and used in the determination of the (-/+" role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">)-enantiomeric distributions for α-pinene, β-pinene, camphene, limonene, and β-phellandrene as emitted by plant material from six conifer species. The six species included the two pine species Pseudotsuga …

Congested Sidewalks: The Effects Of The Built Environment On E-Scooter Parking Compliance, Rob Hemphill, John Macarthur, Phil Longenecker, Garima Desai, Lillie Nie, Abbey Ibarra, Jennifer Dill

Urban Studies and Planning Faculty Publications and Presentations

With the proliferation of electric scooters (e-scooters) in cities across the world, concerns continue to arise about their parking spots on sidewalks and other public spaces. Research has looked at e-scooter parking compliance and compared compliance to other mobility devices, but research has not yet examined the impacts of the built environment on parking compliance. Using a field observation dataset in Portland, Oregon, and novel GIS data, we attempt to understand the spatial distribution of e-scooter parking and the impact of built features on parking compliance, offering recommendations for policymakers and future research. The results of our study show that …

Experimental Evaluation Of A 63.3:1 Dual-Stage Coaxial Magnetic Gear, Hossein Baninajar, Sina Modaresahmadi, H. Y. Wong, Jonathan Bird, W. Williams, B. Dechant

Electrical and Computer Engineering Faculty Publications and Presentations

This paper presents the construction and testing results for a 63.3:1 dual-stage coaxial magnetic gear for use in a marine hydrokinetic generator demonstrator application. The dual-stage magnetic gear is composed of series-connected coaxial magnetic gear. The stage-2 magnetic gear utilizes Halbach magnet arrays on both rotors and has a 9.5:1 gear ratio. The stage-1 magnetic gear utilizes a Halbach rotor on the outer rotor and a flux concentration inner rotor. The stage-1 magnetic gear has a 6.67:1 gear ratio and at the peak torque of 1220Nm the stage-1 MG was shown to be capable of operating with a 268 N·m/L …

Ternary Logic Design In Topological Quantum Computing, Muhammad Ilyas, Shawn Cui, Marek Perkowski

Electrical and Computer Engineering Faculty Publications and Presentations

A quantum computer can perform exponentially faster than its classical counterpart. It works on the principle of superposition. But due to the decoherence effect, the superposition of a quantum state gets destroyed by the interaction with the environment. It is a real challenge to completely isolate a quantum system to make it free of decoherence. This problem can be circumvented by the use of topological quantum phases of matter. These phases have quasiparticles excitations called anyons. The anyons are charge-flux composites and show exotic fractional statistics. When the order of exchange matters, then the anyons are called non-Abelian anyons. Majorana …

Fall Prediction Based On Instrumented Measures Of Gait And Turning In Daily Life In People With Multiple Sclerosis, Ishu Arpan, Vrutangkumar Shah, James Mcnames, Graham Harker, Patricia Carlson-Kuhta, Rebecca I. Spain, Mahmoud El-Gohary, Martina Mancini, Fay Horak

Electrical and Computer Engineering Faculty Publications and Presentations

This study investigates the potential of passive monitoring of gait and turning in daily life in people with multiple sclerosis (PwMS) to identify those at future risk of falls. Seven days of passive monitoring of gait and turning were carried out in a pilot study of 26 PwMS in home settings using wearable inertial sensors. The retrospective fall history was collected at the baseline. After gait and turning data collection in daily life, PwMS were followed biweekly for a year and were classified as fallers if they experienced >1 fall. The ability of short-term passive monitoring of gait and turning, …

Automatically Generating Scenarios From A Text Corpus: A Case Study On Electric Vehicles, Christopher W.H. Davis, Antoine J. Jetter, Philippe J. Giabbanelli

Engineering and Technology Management Faculty Publications and Presentations

Creating ‘what-if’ scenarios to estimate possible futures is a key component of decision-making processes. However, this activity is labor intensive as it is primarily done manually by subject-matter experts who start by identifying relevant themes and their interconnections to build models, and then craft diverse and meaningful stories as scenarios to run on these models. Previous works have shown that text mining could automate the model-building aspect, for example, by using topic modeling to extract themes from a large corpus and employing variations of association rule mining to connect them in quantitative ways. In this paper, we propose to further …

Quantum Algorithms For Attacking Hardness Assumptions In Classical And Post‐Quantum Cryptography, J.-F. Biasse, X. Bonnetain, E. Kirshanova, A. Schrottenloher, Fang Song

Computer Science Faculty Publications and Presentations

In this survey, the authors review the main quantum algorithms for solving the computational problems that serve as hardness assumptions for cryptosystem. To this end, the authors consider both the currently most widely used classically secure cryptosystems, and the most promising candidates for post-quantum secure cryptosystems. The authors provide details on the cost of the quantum algorithms presented in this survey. The authors furthermore discuss ongoing research directions that can impact quantum cryptanalysis in the future.

Warp-Aware Adaptive Energy Efficiency Calibration For Multi-Gpu Systems, Zhuowei Wang, Xiaoyu Song, Lianglun Cheng, Hai Wan, Wuqing Zhao, Tao Wang

Electrical and Computer Engineering Faculty Publications and Presentations

Massive GPU acceleration processors have been used in high-performance computing systems. The Dennard-scaling has led to power and thermal constraints limiting the performance of such systems. The demand for both increased performance and energy-efficiency is highly desired. This paper presents a multi-layer low-power optimisation method for warps and tasks parallelisms. We present a dynamic frequency regulation scheme for performance parameters in terms of load balance and load imbalance. The method monitors the energy parameters in runtime and adjusts adaptively the voltage level to ensure the performance efficiency with energy reduction. The experimental results show that the multi-layer low-power optimisation with …

Emergent Landscapes Of Renewable Energy Storage: Considering Just Transitions In The Western United States, Bethani Turley, Alida Cantor, Kate Berry, Sarah Knuth, Dustin Mulvaney, Noel Vineyard

Geography Faculty Publications and Presentations

Governments, utilities, and energy companies are increasingly looking towards energy storage technologies to extend the availability of variable renewable power sources such as solar and wind. In this Perspective, we examine these fast-shifting developments by mapping and analyzing landscapes of renewable energy storage emerging across the Western United States. We focus on the rollout of several interrelated leading technologies: utility-scale lithium-ion batteries, supported by increasing regional lithium mining, and proposals for new pumped storage hydropower. Drawing on critical resource geography, we examine energy storage as both a component of renewable transition and as its own driver of landscape transformation, resource …

A Heuristic For The Two-Echelon Multi-Period Multi-Product Location–Inventory Problem With Partial Facility Closing And Reopening, Puntipa Punyim, Ampol Karoonsoontawong, Avinash Unnikrishnan, Vatanavongs Ratanavaraha

Civil and Environmental Engineering Faculty Publications and Presentations

In this paper, the two-echelon multi-period multi-product location–inventory problem with partial facility closing and reopening is studied. For each product and period, plants serve warehouses, which serve consolidation hubs, which service customers with independent, normally distributed demands. The schedule of construction, temporary partial closing, and reopening of modular capacities of facilities, the continuous-review inventory control policies at warehouses, the allocation of customer demands to hubs, and the allocation of hubs to warehouses are determined. The service levels for stockout at warehouses during lead time and the violation of warehouse and hub capacities are explicitly considered. The proposed mixed-integer non-linear program …

A Lacunarity-Based Index For Spatial Heterogeneity, Ryan H. Scott, Hawwa Falih Kadum, G. Salmaso, Marc Calaf, Raul Bayoan Cal

Mechanical and Materials Engineering Faculty Publications and Presentations

Characteri zing spatial heterogeneity is fundamental in numerous areas, yet defining spatial patterns often depends on qualitative assessments or a priori knowledge. Lacunarity analysis is a popular occupancy-based method for identi fy ing relevant length scales in spatially heterogeneous systems. From lacunarity, we identify the ex istence of a point which encapsulates the spatial heterogeneity of a given system. This value sati sfies the conditions for the lac unarity cutoff function and forms the bas is of a heterogeneity index. We evaluate the behavior of both parameters in mono fractal, clustered, and periodic systems. ln addition, we demonstrate the broad …

An Economical And Repeatable Method For Mapping Shade Cast On Water Channels, Eric M. Nielsen

Institute for Natural Resources Publications

The motivation of this work is to provide insights toward determining a viable strategy for statewide monitoring of riparian vegetation condition, with particular focus on developing a repeatable, costeffective method for assessment of progress toward achieving temperature-based water quality standards mandated by the federal Clean Water Act. A reliable monitoring strategy could in turn support a datadriven prioritization and assessment framework to increase the efficiency, effectiveness and accountability of riparian restoration efforts. In this project we developed and tested a method for mapping shade cast on water channels by riparian vegetation using optical imagery sources that are affordable and regularly …

The Right To The University: The Experiences Of Mexican/Mexican American/Xicanx Students At A Predominantly White University In Upstate New York, Martín Alberto Gonzalez

Chicano/Latino Studies Faculty Publications and Presentations

Having the right to a space is not only the right to be present without being harassed or bothered, but it also includes the right to have a say in how that space should be experienced. Yet, spaces have long been contested and not everyone has equal access to shared spaces. This paper examines the experiences of Mexican/Mexican American/Xicanx (MMAX) undergraduate students at a predominantly white university in the Northeast. Drawing on indepth interviews, participant observations, pláticas, and document analyses, I argue that MMAX students do not have the right to their respective university because their university does not address …

Building Community Capacity With Philosophy: Toolbox Dialogue And Climate Resilience, Bryan Cwik, Chad Gonnerman, Michael O'Rourke, Brian Robinson, Daniel Schoonmaker

Philosophy Faculty Publications and Presentations

In this article, we describe a project in which philosophy, in combination with methods drawn from mental modeling, was used to structure dialogue among stakeholders in a region-scale climate adaptation process. The case study we discuss synthesizes the Toolbox dialogue method, a philosophically grounded approach to enhancing communication and collaboration in complex research and practice, with a mental modeling approach rooted in risk analysis, assessment, and communication to structure conversations among non-academic stakeholders who have a common interest in planning for a sustainable future. We begin by describing the background of this project, including details about climate resiliency efforts in …

Launching The Wasatch Transportation Academy, Nathan Mcneil, Keith Bartholomew, Matthew Ryan

TREC Final Reports

The “Community Transportation Academy” model seeks to break down the barriers for community members to participate in transportation decision-making processes. Since 1991, the Portland Traffic and Transportation Course has held at least one course each year, connecting Portland residents with top planners, engineers, and decision-makers from agencies working on transportation in the region, with the goal of conveying the factors professionals consider, ranging from technical considerations, legal and policy mandates, other tradeoffs, and how the community can engage with and influence decisions. This project sought to implement a transportation academy in the Salt Lake City region inspired by the Portland …

Editorial: Helping Scientists To Communicate Well For All Considered: Strategic Science Communication In An Age Of Environmental And Health Crises, Brianne Suldovsky, Marcia Allison, Marina Joubert, Ingrid E. Lofgren, Scott Mcwilliams

Communication Faculty Publications and Presentations

From documenting evidence-based science communication training programs to examining issues of intersectionality and inclusivity in science communication, each of the 12 articles in this special issue offers a unique perspective on science communication, public engagement, and inclusivity. The case studies of training programs provide helpful lessons learned that have broad applicability. The descriptions of how social scientific and rhetorical approaches have been used to enhance inclusive science communication offer new insights into more effective science communication practices. Our hope is that, taken together, these articles will inspire improvements in our collective ability to more effectively and equitably apply scientific research …

Science Education Research On Student To Student Discourse: A Literature Review With An Applied Linguistics Lens, Abbee A. Mortensen

University Honors Theses

Science education researchers have increasingly been using discourse analysis to research small group discussion while doing course related activities. This literature review examined studies from that discourse community to see what analysis methods were used and if they connected to applied linguistics theories or methods. Two of the most common discourse analysis frameworks used were Toulmin's Argument Pattern and grounded coding schemes that looked at the design and specific contents of the discourse. Studies covered will also include education scholars using theories of conversation analysis and normative pragmatics to make a more explicit connection to applied linguistics. Orienting and drawing …

Disposable Puff Bar Electronic Cigarettes: Chemical Composition And Toxicity Of E-Liquids And A Synthetic Coolant, Esther E. Omaiye, Wentai Luo, Kevin J. Mcwhirter, James F. Pankow, Prue Talbot

Civil and Environmental Engineering Faculty Publications and Presentations

The popularity of disposable fourth-generation electronic cigarettes (ECs) among young adults and adolescents has been increasing since the ban on flavored cartridge EC products such as JUUL. Although the constituents and toxicity of some cartridge-based fourth-generation ECs, such as JUUL, have been studied, limited data exist for other disposable ECs such as Puff. The purpose of this study was to determine flavor chemicals, synthetic coolants, and nicotine concentrations in 16 disposable Puff devices, evaluate the cytotoxicity of the different flavors from the Puff brand using in vitro assays, and investigate the health risks of synthetic coolants in EC products. Gas …

Combining Passive And Active Ultrasonic Stress Wave Monitoring Techniques: Opportunities For Condition Evaluation Of Concrete Structures, Thomas Schumacher, Ernst Niederleithinger

Civil and Environmental Engineering Faculty Publications and Presentations

Concrete structures are invaluable assets to a society and managing them efficiently and effectively can be supported by information gathered through structural health monitoring (SHM). In this paper, a combined approach based on passive, i.e., acoustic emission (AE), and active, i.e., ultrasonic stress wave (USW) monitoring techniques for application to concrete structures is proposed and evaluated. While AE and USW are based on the same underlying physics, i.e., wave motion in solids, they differ fundamentally with respect to the nature of the source. For the former, external stimuli such as mechanical loads or temperature cause the rapid release of energy …

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 …

Perceived Stress, Resilience, And Wellbeing In Seasoned Isha Yoga Practitioners Compared To Matched Controls During The Covid-19 Pandemic, Preeti Upadhyay, Shilpa Narayanan, Tanvi Khera, Lauren Kelly, Pooja A. Mathur, Akshay Shanker, Lena Novack, Ruth Pérez-Robles, Kim A. Hoffman, Multiple Additional Authors

OHSU-PSU School of Public Health Faculty Publications and Presentations

Background: Yoga practices, including breathing, meditation, and posture protocols (asanas), have been shown to facilitate physical and mental wellbeing.

Methods: Seasoned yoga practitioners were recruited from the Isha Foundation. Recruitment of the comparison group was achieved using snowball sampling and were not yoga practitioners. Participants in the non-yoga group were randomized to a 3-min Isha practice or a comparator group asked to perform 15-min of daily reading. Participants completed a series of web-based surveys (REDCap) at baseline, 6, and 12 weeks. These surveys include validated scales and objective questions on COVID-19 infection and medical history. The validated questionnaires assess for: …

Flow In Additively Manufactured Super-Rough Channels, Samuel Altland, Xiaowei Zhu, Stephen Mcclain, Robert Kunz, Xiang Yang

Mechanical and Materials Engineering Faculty Publications and Presentations

Metal additive manufacturing has enabled geometrically complex internal cooling channels for turbine and heat exchanger applications, but the process gives rise to large-scale roughness whose size is comparable to the channel height (which is 500 μm). These super-rough channels pose previously unseen challenges for experimental measurements, data interpretation and roughness modelling. First, it is not clear if measurements at a particular streamwise and spanwise location still provide accurate representation of the mean (time- and plane-averaged) flow. Second, we do not know if the logarithmic layer survives. Third, it is unknown how well previously developed rough-wall models work for these large-scale …

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 …