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2020

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Off-Policy Q-Learning For Anti-Interference Control Of Multi-Player Systems, Jinna Li, Zhenfei Xiao, Tianyou Chai, Frank L. Lewis, Sarangapani Jagannathan Jan 2020

Off-Policy Q-Learning For Anti-Interference Control Of Multi-Player Systems, Jinna Li, Zhenfei Xiao, Tianyou Chai, Frank L. Lewis, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

This paper develops a novel off-policy game Q-learning algorithm to solve the anti-interference control problem for discrete-time linear multi-player systems using only data without requiring system matrices to be known. The primary contribution of this paper lies in that the Q-learning strategy employed in the proposed algorithm is implemented in an off-policy policy iteration approach other than on-policy learning due to the well-known advantages of off-policy Q-learning over on-policy Q-learning. All of the players work hard together for the goal of minimizing their common performance index meanwhile defeating the disturbance that tries to maximize the specific performance index, and finally …


The Distributional Short-Term Impact Of The Covid-19 Crisis On Wages In The United States, Yonatan Berman Jan 2020

The Distributional Short-Term Impact Of The Covid-19 Crisis On Wages In The United States, Yonatan Berman

Publications and Research

This paper uses Bureau of Labor Statistics employment and wage data to study the distributional impact of the COVID-19 crisis on wages in the United States by mid-April. It answers whether wages of lower-wage workers decreased more than others', and to what extent. We find that the COVID-19 outbreak exacerbates existing inequalities. Workers at the bottom quintile in mid-March were three times more likely to be laid off by mid-April compared to higher-wage workers. Weekly wages of workers at the bottom quintile decreased by 6% on average between mid-February and mid-March and by 26% between mid-March and mid-April. The average …


Singlet Fission In A Hexacene Dimer: Energetics Dictate Dynamics, Samuel N. Sanders, Elango Kumarasamy, Kealan J. Fallon, Matthew Y. Sfeir, Luis M. Campos Jan 2020

Singlet Fission In A Hexacene Dimer: Energetics Dictate Dynamics, Samuel N. Sanders, Elango Kumarasamy, Kealan J. Fallon, Matthew Y. Sfeir, Luis M. Campos

Publications and Research

Singlet fission (SF) is an exciton multiplication process with the potential to raise the efficiency limit of single junction solar cells from 33% to up to 45%. Most chromophores generally undergo SF as solid-state crystals. However, when such molecules are covalently coupled, the dimers can be used as model systems to study fundamental photophysical dynamics where a singlet exciton splits into two triplet excitons within individual molecules. Here we report the synthesis and photophysical characterization of singlet fission of a hexacene dimer. Comparing the hexacene dimer to analogous tetracene and pentacene dimers reveals that excess exoergicity slows down singlet fission, …


Double Inclusive Small-X Gluon Production And Their Azimuthal Correlations In A Biased Ensemble, Gary Kapilevich Jan 2020

Double Inclusive Small-X Gluon Production And Their Azimuthal Correlations In A Biased Ensemble, Gary Kapilevich

Publications and Research

We consider double gg → g production in the presence of a bias on the unintegrated gluon distribution of the colliding hadrons or nuclei. Such bias could be due to the selection of configurations with a greater number of gluons or higher mean transverse momentum squared or, more generally, due to a modified spectral shape of the gluon distribution in the hadrons. Hence, we consider reweighted functional averages over the stochastic ensemble of small-x gluons. We evaluate explicitly the double inclusive gluon transverse momentum spectrum in high-energy collisions, and their azimuthal correlations, for a few simple examples of biases.


On The Classification Of Duality Webs For Graded Quivers, Sebastían Franco, Azeem Hasan, Xingyang Yu Jan 2020

On The Classification Of Duality Webs For Graded Quivers, Sebastían Franco, Azeem Hasan, Xingyang Yu

Publications and Research

We study the m-graded quiver theories associated to CY (m+2)-folds and their order (m + 1) dualities. We investigate how monodromies give rise to mutation invariants, which in turn can be formulated as Diophantine equations characterizing the space of dual theories associated to a given geometry. We discuss these ideas in general and illustrate them in the case of orbifold theories. Interestingly, we observe that even in this simple context the corresponding Diophantine equations may admit an infinite number of seeds for m ≥ 2, which translates into an infinite number of disconnected duality webs. Finally, …


"Lagrangian Disks" In M-Theory, Sebastián Franco, Sergei Gukov, Sangmin Lee, Rak-Kyeong Seong, James Sparks Jan 2020

"Lagrangian Disks" In M-Theory, Sebastián Franco, Sergei Gukov, Sangmin Lee, Rak-Kyeong Seong, James Sparks

Publications and Research

While the study of bordered (pseudo-)holomorphic curves with boundary on Lagrangian submanifolds has a long history, a similar problem that involves (special) Lagrangian submanifolds with boundary on complex surfaces appears to be largely overlooked in both physics and math literature. We relate this problem to geometry of coassociative submanifolds in G2 holonomy spaces and to Spin(7) metrics on 8-manifolds with T2 fibrations. As an application to physics, we propose a large class of brane models in type IIA string theory that generalize brane brick models on the one hand and 2d theories T[M4] on …


Computer Science For Equity: Teacher Education, Agency, And Statewide Reform, Joanna Goode, Max Skorodinsky, Jill Hubbard, James Hook Jan 2020

Computer Science For Equity: Teacher Education, Agency, And Statewide Reform, Joanna Goode, Max Skorodinsky, Jill Hubbard, James Hook

Computer Science Faculty Publications and Presentations

This paper reports on a statewide “Computer Science for All” initiative in Oregon that aims to democratize high school computer science and broaden participation in an academic subject that is one of the most segregated disciplines nationwide, in terms of both race and gender. With no statewide policies to support computing instruction, Oregon's legacy of computer science education has been marked by both low participation and by rates of underrepresented students falling well-below the already dismal national rates. The study outlined in this paper focuses on how teacher education can support educators in developing knowledge and agency, and impacting policies …


On Basing One-Way Permutations On Np-Hard Problems Under Quantum Reductions, Nai-Hui Chia, Sean Hallgren, Fang Song Jan 2020

On Basing One-Way Permutations On Np-Hard Problems Under Quantum Reductions, Nai-Hui Chia, Sean Hallgren, Fang Song

Computer Science Faculty Publications and Presentations

A fundamental pursuit in complexity theory concerns reducing worst-case problems to average-case problems. There exist complexity classes such as PSPACE that admit worst-case to average-case reductions. However, for many other classes such as NP, the evidence so far is typically negative, in the sense that the existence of such reductions would cause collapses of the polynomial hierarchy(PH). Basing cryptographic primitives, e.g., the average-case hardness of inverting one-way permutations, on NP-completeness is a particularly intriguing instance. As there is evidence showing that classical reductions from NP-hard problems to breaking these primitives result in PH collapses, it seems unlikely to base cryptographic …


Selectivity And Robustness Of Sparse Coding Networks, Dylan M. Paiton, Charles Frye, Sheng Y. Lundquist, Joel D. Bowen, Ryan Zarcone, Bruno A. Olshausen Jan 2020

Selectivity And Robustness Of Sparse Coding Networks, Dylan M. Paiton, Charles Frye, Sheng Y. Lundquist, Joel D. Bowen, Ryan Zarcone, Bruno A. Olshausen

Computer Science Faculty Publications and Presentations

We investigate how the population nonlinearities resulting from lateral inhibition and thresholding in sparse coding networks influence neural response selectivity and robustness. We show that when compared to pointwise nonlinear models, such population nonlinearities improve the selectivity to a preferred stimulus and protect against adversarial perturbations of the input. These findings are predicted from the geometry of the single-neuron iso-response surface, which provides new insight into the relationship between selectivity and adversarial robustness. Inhibitory lateral connections curve the iso-response surface outward in the direction of selectivity. Since adversarial perturbations are orthogonal to the iso-response surface, adversarial attacks tend to be …


Continuous Deployment Transitions At Scale, Laurie Williams, Kent Beck, Jeffrey Creasey, Andrew Glover, James Holman, Jez Humble, David Mclaughlin, John Thomas Micco, Brendan Murphy, Jason A. Cox, Vishnu Pendyala, Steven Place, Zachary T. Pritchard, Chuck Rossi, Tony Savor, Michael Stumm, Chris Parnin Jan 2020

Continuous Deployment Transitions At Scale, Laurie Williams, Kent Beck, Jeffrey Creasey, Andrew Glover, James Holman, Jez Humble, David Mclaughlin, John Thomas Micco, Brendan Murphy, Jason A. Cox, Vishnu Pendyala, Steven Place, Zachary T. Pritchard, Chuck Rossi, Tony Savor, Michael Stumm, Chris Parnin

Faculty Research, Scholarly, and Creative Activity

Predictable, rapid, and data-driven feature rollout; lightning-fast; and automated fix deployment are some of the benefits most large software organizations worldwide are striving for. In the process, they are transitioning toward the use of continuous deployment practices. Continuous deployment enables companies to make hundreds or thousands of software changes to live computing infrastructure every day while maintaining service to millions of customers. Such ultra-fast changes create a new reality in software development. Over the past four years, the Continuous Deployment Summit, hosted at Facebook, Netflix, Google, and Twitter has been held. Representatives from companies like Cisco, Facebook, Google, IBM, Microsoft, …


Evolution Of Integration, Build, Test, And Release Engineering Into Devops And To Devsecops, Vishnu Pendyala Jan 2020

Evolution Of Integration, Build, Test, And Release Engineering Into Devops And To Devsecops, Vishnu Pendyala

Faculty Research, Scholarly, and Creative Activity

Software engineering operations in large organizations are primarily comprised of integrating code from multiple branches, building, testing the build, and releasing it. Agile and related methodologies accelerated the software development activities. Realizing the importance of the development and operations teams working closely with each other, the set of practices that automated the engineering processes of software development evolved into DevOps, signifying the close collaboration of both development and operations teams. With the advent of cloud computing and the opening up of firewalls, the security aspects of software started moving into the applications leading to DevSecOps. This chapter traces the journey …


Fostering Self-Efficacy For Biblical Learning And Doctrinal Awareness With Micro-Teaching In A Brief Course On Bible Study, Robin K. Henson Jan 2020

Fostering Self-Efficacy For Biblical Learning And Doctrinal Awareness With Micro-Teaching In A Brief Course On Bible Study, Robin K. Henson

Doctoral Dissertations and Projects

Self-efficacy for biblical learning was explored in the context of a small group experience focused on how to study the Bible. After first developing a new instrument to measure self-efficacy for biblical learning in a pilot study, ten church attendees participated in a seven-week course designed around the hermeneutical principles of understanding a Scripture passage in textual and historical context, placing the passage in the grand story of God, and relating it to relevant doctrine. The small group process employed micro-teaching as a mechanism to facilitate challenge and mastery experience in learning. Micro-teaching places the student in the role of …


The Biocompatibility Of Silver And Nanohydroxyapatite Coatings On Titanium Dental Implants With Human Primary Osteoblast Cells, Ranj Nadhim Salaie, Alexandros Besinis, Huirong Le, Christopher Tredwin, Richard D. Handy Jan 2020

The Biocompatibility Of Silver And Nanohydroxyapatite Coatings On Titanium Dental Implants With Human Primary Osteoblast Cells, Ranj Nadhim Salaie, Alexandros Besinis, Huirong Le, Christopher Tredwin, Richard D. Handy

School of Engineering, Computing and Mathematics

No abstract provided.


Physical Activity And The Prevention, Reduction, And Treatment Of Alcohol And Other Drug Use Across The Lifespan (The Phase Review): A Systematic Review, T. P. Thompson, J. Horrell, A. H. Taylor, A. Wanner, K. Husk, Y. Wei, S. Creanor, R. Kandiyali, J. Neale, J. Sinclair, M. Nasser, G. Wallace Jan 2020

Physical Activity And The Prevention, Reduction, And Treatment Of Alcohol And Other Drug Use Across The Lifespan (The Phase Review): A Systematic Review, T. P. Thompson, J. Horrell, A. H. Taylor, A. Wanner, K. Husk, Y. Wei, S. Creanor, R. Kandiyali, J. Neale, J. Sinclair, M. Nasser, G. Wallace

Peninsula Medical School

The aim of this review is to systematically describe and quantify the effects of PA interventions on alcohol and other drug use outcomes, and to identify any apparent effect of PA dose and type, possible mechanisms of effect, and any other aspect of intervention delivery (e.g. key behaviour change processes), within a framework to inform the design and evaluation of future interventions. Systematic searches were designed to identify published and grey literature on the role of PA for reducing the risk of progression to alcohol and other drug use (PREVENTION), supporting individuals to reduce alcohol and other drug use for …


Using Multiple Data Sources To Detect Manipulated Electricity Meter By An Entropy-Inspired Metric, Denis Hock, Martin Kappes, Bogdan Ghita Jan 2020

Using Multiple Data Sources To Detect Manipulated Electricity Meter By An Entropy-Inspired Metric, Denis Hock, Martin Kappes, Bogdan Ghita

School of Engineering, Computing and Mathematics

No abstract provided.


Geometrical Investigation Of A U-Shaped Oscillating Water Column Wave Energy Device, De Zhi Ning, Bao Ming Guo, Rong Quan Wang, Thomas Vyzikas, Deborah Greaves Jan 2020

Geometrical Investigation Of A U-Shaped Oscillating Water Column Wave Energy Device, De Zhi Ning, Bao Ming Guo, Rong Quan Wang, Thomas Vyzikas, Deborah Greaves

School of Engineering, Computing and Mathematics

No abstract provided.


Digital Forensics Cloud Log Unification: Implementing Cadf In Apache Cloudstack, Nikolaos Dalezios, Stavros Shiaeles, Nicholas Kolokotronis, Bogdan Ghita Jan 2020

Digital Forensics Cloud Log Unification: Implementing Cadf In Apache Cloudstack, Nikolaos Dalezios, Stavros Shiaeles, Nicholas Kolokotronis, Bogdan Ghita

School of Engineering, Computing and Mathematics

No abstract provided.


Plain Polystyrene Microplastics Reduce The Toxic Effects Of Zno Particles On Marine Microalgae Dunaliella Salina., D Gunasekaran, N Chandrasekaran, D Jenkins, A Mukherjee Jan 2020

Plain Polystyrene Microplastics Reduce The Toxic Effects Of Zno Particles On Marine Microalgae Dunaliella Salina., D Gunasekaran, N Chandrasekaran, D Jenkins, A Mukherjee

School of Engineering, Computing and Mathematics

No abstract provided.


Detection Of Insider Threats Using Artificial Intelligence And Visualisation, Vasileios Koutsouvelis, Stavros Shiaeles, Bogdan Ghita, Gueltoum Bendiab Jan 2020

Detection Of Insider Threats Using Artificial Intelligence And Visualisation, Vasileios Koutsouvelis, Stavros Shiaeles, Bogdan Ghita, Gueltoum Bendiab

School of Engineering, Computing and Mathematics

No abstract provided.


Hydroelasticity Effects On Water-Structure Impacts, T Mai, C Mai, A. Raby, D. M. Greaves Jan 2020

Hydroelasticity Effects On Water-Structure Impacts, T Mai, C Mai, A. Raby, D. M. Greaves

School of Engineering, Computing and Mathematics

No abstract provided.


Preparation Of Supporting Photocatalysts For Water Treatment Using Natural Sunlight As An Alternative Driving Energy, Puttaiah S Harikaranahalli, S Menon, Ravindra Y Shivamurthy, S Kumari, H Revanna, D Jenkins Jan 2020

Preparation Of Supporting Photocatalysts For Water Treatment Using Natural Sunlight As An Alternative Driving Energy, Puttaiah S Harikaranahalli, S Menon, Ravindra Y Shivamurthy, S Kumari, H Revanna, D Jenkins

School of Engineering, Computing and Mathematics

No abstract provided.


Possible Challenges And Appropriate Measures For A Resilient Wmn-Based Disaster Network, Gregor Frick, Auberlin Paguem Tchinda, Ulrich Trick, Armin Lehmann, Bogdan Ghita Jan 2020

Possible Challenges And Appropriate Measures For A Resilient Wmn-Based Disaster Network, Gregor Frick, Auberlin Paguem Tchinda, Ulrich Trick, Armin Lehmann, Bogdan Ghita

School of Engineering, Computing and Mathematics

No abstract provided.


Offshore Conversion Of Wind Power To Gaseous Fuels: Feasibility Study In A Depleted Gas Field, P. D. O'Kelly-Lynch, P. D. Gallagher, A. G.L. Borthwick, E. J. Mckeogh, P. G. Leahy Jan 2020

Offshore Conversion Of Wind Power To Gaseous Fuels: Feasibility Study In A Depleted Gas Field, P. D. O'Kelly-Lynch, P. D. Gallagher, A. G.L. Borthwick, E. J. Mckeogh, P. G. Leahy

School of Engineering, Computing and Mathematics

A proof-of-concept study is presented of a Power-to-Gas system that is located fully offshore. This paper analyses how such a system would perform if based at the depleted Kinsale Gas Field in the Celtic Sea Basin off the south coast of Ireland. An offshore wind farm is proposed as the power source for the system. Several conversion technologies are examined in detail in terms of resource efficiency, technological maturity, and platform area footprint, the aim being to ascertain their overall applicability to an offshore Power-to-Gas system. The technologies include proton exchange membrane electrolysers for electrolysis of water to release H2. …


Global Trends In Water And Sediment Fluxes Of The World’S Large Rivers, Li Li, Jinren Ni, Fang Chang, Yao Yue, Natalia Frolova, Dmitry Magritsky, Alistair G.L. Borthwick, Philippe Ciais, Yichu Wang, Chunmiao Zheng, Desmond E. Walling Jan 2020

Global Trends In Water And Sediment Fluxes Of The World’S Large Rivers, Li Li, Jinren Ni, Fang Chang, Yao Yue, Natalia Frolova, Dmitry Magritsky, Alistair G.L. Borthwick, Philippe Ciais, Yichu Wang, Chunmiao Zheng, Desmond E. Walling

School of Engineering, Computing and Mathematics

No abstract provided.


The Role Of Natural Fe(Ii)-Bearing Minerals In Chemoautotrophic Chromium (Vi) Bio-Reduction In Groundwater, Jianping Lu, Baogang Zhang, Chao He, Alistair G.L. Borthwick Jan 2020

The Role Of Natural Fe(Ii)-Bearing Minerals In Chemoautotrophic Chromium (Vi) Bio-Reduction In Groundwater, Jianping Lu, Baogang Zhang, Chao He, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.


Barrier Lake Formation Due To Landslide Impacting A River: A Numerical Study Using A Double Layer-Averaged Two-Phase Flow Model, Ji Li, Zhixian Cao, Yifei Cui, Alistair G.L. Borthwick Jan 2020

Barrier Lake Formation Due To Landslide Impacting A River: A Numerical Study Using A Double Layer-Averaged Two-Phase Flow Model, Ji Li, Zhixian Cao, Yifei Cui, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.


Alternate Erosion And Deposition In The Yangtze Estuary And The Future Change, Boyuan Zhu, Yitian Li, Yao Yue, Yunping Yang, Enhang Liang, Chuncai Zhang, Alistair G.L. Borthwick Jan 2020

Alternate Erosion And Deposition In The Yangtze Estuary And The Future Change, Boyuan Zhu, Yitian Li, Yao Yue, Yunping Yang, Enhang Liang, Chuncai Zhang, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.


Vanadium Contamination And Associated Health Risk Of Farmland Soil Near Smelters Throughout China, Yi'na Li, Baogang Zhang, Ziqi Liu, Song Wang, Jun Yao, Alistair G.L. Borthwick Jan 2020

Vanadium Contamination And Associated Health Risk Of Farmland Soil Near Smelters Throughout China, Yi'na Li, Baogang Zhang, Ziqi Liu, Song Wang, Jun Yao, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.


Piston-Driven Numerical Wave Tank Based On Weno Solver Of Well-Balanced Shallow Water Equations, Jaeyoung Jung, Jin Hwan Hwang, Alistair G.L. Borthwick Jan 2020

Piston-Driven Numerical Wave Tank Based On Weno Solver Of Well-Balanced Shallow Water Equations, Jaeyoung Jung, Jin Hwan Hwang, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.


Erosion-Deposition Patterns And Depo-Center Movements In Branching Channels At The Near-Estuary Reach Of The Yangtze River, Boyuan Zhu, Jinyun Deng, Jinwu Tang, Wenjun Yu, Alistair G.L. Borthwick, Yuanfang Chai, Zhaohua Sun, Yitian Li Jan 2020

Erosion-Deposition Patterns And Depo-Center Movements In Branching Channels At The Near-Estuary Reach Of The Yangtze River, Boyuan Zhu, Jinyun Deng, Jinwu Tang, Wenjun Yu, Alistair G.L. Borthwick, Yuanfang Chai, Zhaohua Sun, Yitian Li

School of Engineering, Computing and Mathematics

No abstract provided.