Digital Commons Network^™

Convergence Analysis Of A Proximal Point Algorithm For Minimizing Differences Of Functions, Thai An Nguyen, Mau Nam Nguyen

Mathematics and Statistics Faculty Publications and Presentations

Several optimization schemes have been known for convex optimization problems. However, numerical algorithms for solving nonconvex optimization problems are still underdeveloped. A significant progress to go beyond convexity was made by considering the class of functions representable as differences of convex functions. In this paper, we introduce a generalized proximal point algorithm to minimize the difference of a nonconvex function and a convex function. We also study convergence results of this algorithm under the main assumption that the objective function satisfies the Kurdyka– ᴌojasiewicz property.

Reorganizing Algebraic Thinking: An Introduction To Dynamic System Modeling, Diana Fisher

Mathematics and Statistics Faculty Publications and Presentations

System Dynamics (SD) modeling is a powerful analytical method used by professional scientists, academics, and governmental officials to study the behavior patterns of complex systems. Specifically through use of the Stella software, it is a method that I and others have used for over two decades with high school, and even middle school, math and science students. In this paper I describe an introduction to SD modeling intended for an algebra class (in either middle or high school). In the body of the paper, a nested sequence of simple bank account examples, increasing in complexity, is used to demonstrate a …

On The Uniformity Of (3/2)N Modulo 1, Paula Neeley, Daniel Taylor-Rodriguez, J.J.P. Veerman, Thomas Roth

Mathematics and Statistics Faculty Publications and Presentations

It has been conjectured that the sequence (3/2)n modulo 1 is uniformly distributed. The distribution of this sequence is significant in relation to unsolved problems in number theory including the Collatz conjecture. In this paper, we describe an algorithm to compute (3/2)n modulo 1 to n = 108 . We then statistically analyze its distribution. Our results strongly agree with the hypothesis that (3/2)n modulo 1 is uniformly distributed.

Increasing Student Cognitive Engagement In The Math Classroom Through Sustained Professional Development, Eva Thanheiser, Brenda Rosencrans, Kathleen Mary Melhuish, Joshua B. Fagan, Layla Guyot

Mathematics and Statistics Faculty Publications and Presentations

We share the case of one teacher engaged in professional development (PD) designed to improve collective argumentation. We present an analysis of two lessons in her classroom, one before and one after her engagement with the professional development. Findings show that the classrooms differ across both teacher support for collective argumentation (requesting ideas and elaboration vs. requesting/acts and methods), and student contributions Oustifications vs. procedures and facts) .

The T6a Modification Acts As A Positive Determinant For The Anticodon Nuclease Prrc, And Is Distinctively Nonessential In Streptococcus Mutans, Jo Marie Bacusmo, Silvia S. Orsini, Jennifer Hu, Michael Demott, Patrick C. Thiaville, Ameer Elfarash, Mellie June Paulines, Diego Rojas-Benítez, Birthe Meineke, Christopher Deutsch, Dirk Iwata-Reuyl, Patrick A. Limbach, Peter C. Dedon, Kelly C. Rice, Stewart Shuman, Valérie De Crécy-Lagard

Chemistry Faculty Publications and Presentations

Endoribonuclease toxins (ribotoxins) are produced by bacteria and fungi to respond to stress, eliminate non-self competitor species, or interdict virus infection. PrrC is a bacterial ribotoxin that targets and cleaves tRNALys UUU in the anticodon loop. In vitro studies suggested that the post-transcriptional modification threonylcarbamoyl adenosine (t⁶A) is required for PrrC activity but this prediction had never been validated in vivo. Here, by using t⁶A-deficient yeast derivatives, it is shown that t⁶A is a positive determinant for PrrC proteins from various bacterial species. Streptococcus mutans is one of the few bacteria where the t …

Mining Data On Traumatic Brain Injury With Reconstructability Analysis, Martin Zwick, Nancy Carney, Rosemary Nettleton

Complex Systems Faculty Publications and Presentations

This paper reports the analysis of data on traumatic brain injury using a probabilistic graphical modeling technique known as reconstructability analysis (RA). The analysis shows the flexibility, power, and comprehensibility of RA modeling, which is well-suited for mining biomedical data. One finding of the analysis is that education is a confounding variable for the Digit Symbol Test in discriminating the severity of concussion; another - and anomalous - finding is that previous head injury predicts improved performance on the Reaction Time test. This analysis was exploratory, so its findings require follow-on confirmatory tests of their generalizability.

Predicting Risk Of Adverse Outcomes In Knee Replacement Surgery With Reconstructability Analysis, Cecily Corrine Froemke, Martin Zwick

Complex Systems Faculty Publications and Presentations

Reconstructability Analysis (RA) is a data mining method that searches for relations in data, especially non-linear and higher order relations. This study shows that RA can provide useful predictions of complications in knee replacement surgery.

Evaluating Hourly Rainfall Characteristics Over The U.S. Great Plains In Dynamically Downscaled Climate Model Simulations Using Nasa-Unified Wrf, Huikyo Lee, Duane E. Waliser, Robert Ferraro, Takamichi Iguchi, Christa D. Peters-Lidard, Baijun Tian, Paul C. Loikith, Daniel B. Wright

Geography Faculty Publications and Presentations

Accurate simulation of extreme precipitation events remains a challenge in climate models. This study utilizes hourly precipitation data from ground stations and satellite instruments to evaluate rainfall characteristics simulated by the NASA-Unified Weather Research and Forecasting (NU-WRF) regional climate model at horizontal resolutions of 4, 12, and 24 km over the Great Plains of the United States. We also examined the sensitivity of the simulated precipitation to different spectral nudging approaches and the cumulus parameterizations. The rainfall characteristics in the observations and simulations were defined as an hourly diurnal cycle of precipitation and a joint probability distribution function (JPDF) between …

City Of Gresham Stormwater Retrofit Master Plan, Teresa F. Huntsinger

Civil and Environmental Engineering Master's Project Reports

The Stormwater Retrofit Master Plan identifies more than 50 stormwater retrofit project opportunities across three watersheds in the City of Gresham. The retrofit projects are prioritized in a scoring system to evaluate the costs and benefits of diverse project sizes and types. Project types range from bioswales and planters in city parking lots and along arterial roads, to regional end-of-pipe facilities and retrofits of existing detention ponds. Top projects will move forward for further assessment, design and construction, helping the city achieve its water quality improvement goals. The scoring system may be used to evaluate additional projects in the future.

Trace Metals In Stormwater: Alternative Best Management Practices, Jennifer Ibeth Mora

Civil and Environmental Engineering Master's Project Reports

Heavy metals, such as copper (Cu) and zinc (Zn), are considered hazardous in natural waters due to their toxicity and non-biodegradability. The focus of this study is to use batch experiments to investigate the heavy metal (Cu and Zn) removal efficiency of perlite and Earthlite^TM to improve in-situ filtration systems for stormwater catchment basins. Stormwater samples from two field sites in Portland, OR, chosen to represent a high-use commercial site and high-traffic urban road, were characterized to inform experimental design and compare to values found in literature. The Linear, Freundlich, and Langmuir isotherm models were used to describe equilibrium …

Campus Sustainability Office Annual Report, 2016-2017, Campus Sustainability Office

Campus Sustainability Office Publications, Reports and Presentations

The Campus Sustainability Office 2016-2017 annual report.

Psu Green Building Summer Internship Final Presentation, 2017, Campus Sustainability Office

Campus Sustainability Office Publications, Reports and Presentations

RESEARCH QUESTION: Is duct cleaning beneficial in terms of energy efficiency and overall occupant comfort?

Sotl In The Lis Classroom: Helping Future Academic Librarians Become More Engaged Teachers, Lindsay Mcniff, Lauren Hays

Communications in Information Literacy

In this paper, we share background and key considerations of the Scholarship of Teaching and Learning (SoTL), and propose introducing library and information science (LIS) students to SoTL as a way to acquaint them with the higher education teaching profession. Throughout the article, we employ reflection as the primary consideration and support structure that frames the benefits of SoTL for instructional growth. Four critical stages of SoTL training, first suggested by Gale and Golde (2004), are recommended for LIS students: Exposure, Encounter, Engagement, and Extension. As instruction responsibilities and opportunities continue to expand in academic librarianship, teaching about SoTL using …

Setting Them Up For Success: Assessing A Pre-Research Assignment For First-Year International Students, Susan Avery

Communications in Information Literacy

As the international student population continues to grow, librarians must adjust their instruction to meet the needs of students who are adapting to a new country, culture, and language. This study assesses first-year international students as they engage in the research process through the completion of concept maps that precede database searches. Librarians assessed concept maps of international students completed prior to information literacy instruction to better understand the difficulties they experienced defining research topics and identifying keywords and alternatives. The results of this assessment provide a deeper understanding of the challenges first-year international students face with creating search strategies. …

Library Experience And Information Literacy Learning Of First Year International Students: An Australian Case Study, Hilary Hughes, Nerilee Hall, Megan Pozzi

Communications in Information Literacy

This qualitative case study provides fresh understandings about first year undergraduate international students’ library and information use at an Australian university, and their associated information literacy learning needs. The findings provide evidence to inform the development of library spaces and information literacy responses that enhance international students’ transition and learning. The study was conducted in 2015 as part of a project that simultaneously investigated the same topic at three US universities. This paper presents the case study context, reviews relevant literature and identifies gaps in research about international students’ library use and information literacy, and outlines the qualitative methodology—questionnaire, interviews …

The Intersection Of Information And Science Literacy, Kristin M. Klucevsek

Communications in Information Literacy

To achieve higher science literacy, both students and the public require discipline-specific information literacy in the sciences. Scientific information literacy is a core component of the scientific process. In addition to teaching how to find and evaluate resources, scientific information literacy should include teaching the process of scholarship as a conversation and publication in the sciences. Faculty and librarians can be challenged in their efforts to teach students because of limited access to published research. Stronger scientific information literacy and more access to scholarly research could improve science literacy as a whole.

A Biological Comparison Of Two Sites: An Ecological Approach Using Community Ecology Metrics Based On Insect Faunal Composition, Kennedy J. Martin

University Honors Theses

Two natural sites in the Portland urban area, River View Natural Area (RVNA) and Powers Marine Park (PMP), were sampled to assess their insect faunal composition with the intention of determining whether the areas are sufficiently similar ecologically that they could potentially be managed as a single unit. The two areas were compared using community ecology metrics based on their respective invertebrate fauna. The results suggested that RVNA and PMP had statistically different ecological communities. The Shannon Diversity Index for PMP was 0.303, and 0.819 for RVNA. The Horn Index of Community Overlap suggested a 93.46% overlap based on these …

Predictive Policing On Portland State University's Campus, Kiley D. Enger

University Honors Theses

Although many want to believe that campuses are safe and free of crime acts, there is a reason for the campus public safety department. Reed College, Lewis and Clark College, and University of Portland all rank as safer schools than Portland State University (PSU) (Niche, 2017). The parking garages and lots in particular have a large number of crimes (Enger, 2016). Using predictive analytics to forecast crime is becoming very popular with large police departments within the last few years. It emphasizes the importance of collecting crime data and created a use for past incident reports. The goal of the …

Cooperative Learning Through Storytelling And The Plant World, Emma Hathaway

University Honors Theses

At a time when young people are disengaging in school, how do we begin to acknowledge that we, as a nation have failed them and how might we look at storytelling and the plant world to establish more inclusive practices in education? Data from a 2015 American Community Survey suggests that in the state of Hawai'i, 40% of public school 8^th graders do not meet the Department of Education (DOE) standards in mathematics. This fall, the National Center for Educational Statistics noted that over half of the country’s public schools reported incidents of criminal activity. As a way to …

Identifying Clouds With Convolutional Neural Networks, Jeff Mullins, Sean Richardson, Peter Drake

Portland Institute for Computational Science Publications

The greatest source of uncertainty in model estimates of projected climate change involve clouds and aerosols. Photographic images of clouds in the sky are simple to acquire and archive, but climate scientists need an automated process for identifying clouds in these images. We bring machine learning to bear on this problem. Specifically, we use convolutional neural networks, which to our knowledge have not previously been applied to this task. We trained a network to identify clear sky, thin cloud, thick cloud, and non-sky pixels in photos taken by the Total Sky Imager. The trained network is capable of classifying 91.9% …

In The Shadow Of The 2016 Election: Immigration Debates In Oregon And Beyond, Kim Williams, Andrea Williams, Phil Carrasco

Political Science Faculty Publications and Presentations

In this record of the lunchtime panel discussion moderated by Daniel J. Tichenor of the University of Oregon Wayne Morse Center for Law and Politics, panelists discussed the issue of immigration following the 2016 presidential election. Touching on the importance of discussions about immigration leading up to the election, demographics in the electorate, and how immigration advocates are mobilizing following the election, the panelists also engaged the audience with a question and answer session.

Portland State Magazine, Portland State University. Office Of University Communications

Portland State Magazine

PSU’s alumni magazine, published 2-3 times a year. In this issue: Partnering with Daimler Trucks is giving students experience and jobs; inspiring the next generation of women leaders; what Antarctica is telling us about our warming planet; Robert Mercer has helped countless students navigate their way to a PSU degree; and more.

Red Pens, White Paper: Wider Implications Of Coulthard’S Call To Sovereignty, Brian Burkhart, David J. Carlson, Billy Stratton, Theodore C. Van Alst, Jr., Carol Edelman Warrior

Indigenous Nations Studies Faculty Publications and Presentations

Transcript of a plenary roundtable conversation focused on Glen Coulthard's book Red Skins, White Masks, presented at the Native American Literature Symposium at the Isleta Resort and Casino in Albuquerque, NM, on Thursday March 17, 2016.Participating were Theo (Ted) Van Alst (Uof Montana), Carol Edelman Warrior (Cornell University), Brian Burkhart (California State University, Northridge), Billy Stratton (Uof Denver) and David J. Carlson (California State University, San Bernardino).The material printed here consists of revised versions of the remarks made by the panelists at NALS, reflecting ongoing conversation that continued, over email, after the conference ended.

Towards An Intellectual History Of Evolutionary Economics: Competition And Struggle Versus Cooperation And Mutual Aid, John B. Hall, Svetlana Kirdina-Chandler

Economics Faculty Publications and Presentations

Our inquiry considers the origins of Evolutionary Economics by reintroducing a debate that took place in Russia in the 19th and early 20th century. Responses to Charles Darwin’s The origin of Species are considered, especially critiques stressing Darwin’s emphasis upon competition and struggle in natural selection, that can be traced directly to Thomas Robert Malthus. Considering challenging contributions made by several Russian scholars, we place special emphasis upon Peter Kropotkin’s focus on cooperation and “mutual aid” in natural selection and evolution. We then speculate upon the commonality found in the evolutionary views advanced by Kropotkin and his American contemporary, Thorstein …

Cyberpdx: A Camp For Broadening Participation In Cybersecurity, Wu-Chang Feng, Robert Liebman, Lois Delcambre, Michael Mooradian Lupro, Tim Sheard, Scott Britell, Gerald W. Recktenwald

University Studies Faculty Publications and Presentations

With society’s increasing dependence on technology infrastructure, the importance of securing the computers, networks, data, and algorithms that run our digital and physical lives is becoming critical. To equip the next generation of citizens for the challenges ahead, an effort is underway to introduce security content early in a student’s academic career. It is important that these efforts broaden participation and increase diversity in the field. While many camps and curricula focus on introducing technical content and skills related to cybersecurity, such approaches can prematurely limit how students view career opportunities in the field, potentially limiting those who ultimately pursue …

Pdxscholar Annual Report 2016, Karen Bjork, Sherry Buchanan, David Coate, Bertrand Robinson, Stacey Schlatter

Library Faculty and Staff Publications and Presentations

This report details the sixth year of operation for PDXScholar, Portland State University's institutional repository, as well as the growth of Portland State University Library's publishing services. The report covers the period between January 1, 2016 and December 31, 2016.

From Stem To Steam: The Neuroscience Behind The Movement Towards Arts Integration In K-12 Curricula, Kayla G. Townsley

University Honors Theses

As a result of disparities in the educational system, numerous scholars and educators across disciplines currently support the STEAM (Science, Technology, Engineering, Art, and Mathematics) movement for arts integration. An educational approach to learning focusing on guiding student inquiry, dialogue, and critical thinking through interdisciplinary instruction, STEAM values both the proficiency of knowledge and understanding. Despite extant literature urging for this integration, the trend has yet to significantly influence federal or state standards for K-12 education in the United States.

This paper provides a brief and focused review of key theories and research from the fields of cognitive …

Design And Assessment Of A Low-Cost, Autonomous, Methane-Ebullition Measurement Apparatus (Mema), Francesca Frattaroli

University Honors Theses

Water reservoirs are increasingly recognized as a significant anthropogenic source of methane (CH₄) production and emissions, CH₄ being the second most prevalent greenhouse gas (GHG) after CO₂. The dominant emission pathway for CH₄ in lacustrine environments is ebullition (bubbling). A survey of current ebullition measurement methods reveals a technology gap; the ability to measure ebullition rates and CH₄ content simultaneously and affordably with high temporal and spatial resolution is not currently available. Characterizing and modeling methane ebullition in water reservoirs is key to quantifying lacustrine methane emissions and providing a basis for potential …

Leveraging Behavioral Finance As A Small Business, Chris Huynh

University Honors Theses

This paper attempts to provide an organized review of the existing, traditional, and modern research on Behavioral Finance with the added analysis of how the field relates itself to modern day consumer and investor behavior. Using literature review and a small business client case study, the paper shows how small businesses are prey to common Behavioral Finance biases, but small businesses are able to leverage the benefits of Behavioral Finance concepts the most.

Relative Sea-Level Trends In New York City During The Past 1500 Years, Andrew C. Kemp, Troy D. Hill, Christopher H. Vane, Niamh Cahill, Philip M. Orton, Stefan A. Talke, Andrew C. Parnell, Kelsey Sanborn, Ellen K. Hartig

Civil and Environmental Engineering Faculty Publications and Presentations

New York City (NYC) is threatened by 21st-century relative sea-level (RSL) rise because it will experience a trend that exceeds the global mean and has high concentrations of low-lying infrastructure and socioeconomic activity. To provide a long-term context for anticipated trends, we reconstructed RSL change during the past ~1500 years using a core of salt-marsh sediment from Pelham Bay in The Bronx. Foraminifera and bulk-sediment δ¹³C values were used as sea-level indicators. The history of sediment accumulation was established by radiocarbon dating and recognition of pollution and land-use trends of known age in down-core elemental, isotopic, and pollen …