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IEEE International Symposium on systems engineering (ISSE)

作者： Juan Carlos Bedoya Ahmed Abdelhadi Chen-Ching Liu Anamika Dubey Power and Energy Center (PEC) Virginia Polytechnic Institute of Technology VA USA Engineering Technology Department University of Houston Houston TX USA Energy Systems Innovation Center from the School of Electrical Engineering & Computer Science Washington State University Pullman WA USA

The optimal power flow (OPF) problem is a relevant subject for the secure and economic power systems operation. For instance, OPF can be used to reduce the power system technical losses. A reduction in 0.1% in the losses accounts for near 50 billion USD in cost savings. Likewise, OPF can be used along with power production forecast tools, for renewable energy sources, to evaluate their impact in the grid security operation planning. In an OPF problem, an objective function related with demand supply generation cost, power line losses, or violation limits is optimized subject to several system security constraints. These constraints are related with branch power flow limits, voltages limits, power injection limits, among others. The exact model of the objective function and constraints of the OPF problem is neither linear nor convex. In this paper it is presented the OPF problem in a Quadratically Constrained Quadratic Program (QCQP) approach. Objective function is based on a quadratic function of the bus voltages and constraints are formulated as Quadratic forms. A two-bus system is used to demonstrates the non-convexity of the OPF problem. Also, it is presented the Rank- 1 convex relaxation of the OPF problem which relaxes the QCQP model into a positive Semidefinite Programming (SDP) model. Once the OPF problem is relaxed into a SDP convex form, a global optimal solution can be obtained. An application example for the OPF problem is presented for the IEEE 14 system. The QCQP and the SDP results are compared and discussed.

关键词： convex programming load flow quadratic programming renewable energy sources

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Corrigendum to “Reciprocal Recommender systems: Analysis of state-of-art literature, challenges and opportunities towards social recommendation” Information Fusion Volume 69 (2020) 103-127

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Information Fusion 2021年 75卷 101-101页

作者： Iván Palomares James Neve Carlos Porcel Luiz Pizzato Ido Guy Enrique Herrera-Viedma Andalusian Research Institute on Data Science and Computational Intelligence (DaSCI) University of Granada Spain Intelligent Systems Laboratory University of Bristol Bristol United Kingdom AI Labs Commonwealth Bank of Australia Sydney Australia eBay Research Netanya Israel Department of Electrical and Computer Engineering from the Faculty of Engineering of the King Abdulaziz University Jeddah 21589 Saudi Arabia

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Correction to: The ELFIN Mission

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Space Science Reviews 2020年第6期216卷 1-2页

作者： Angelopoulos, V. Tsai, E. Bingley, L. Shaffer, C. Turner, D. L. Runov, A. Li, W. Liu, J. Artemyev, A. V. Zhang, X.-J. Strangeway, R. J. Wirz, R. E. Shprits, Y. Y. Sergeev, V. A. Caron, R. P. Chung, M. Cruce, P. Greer, W. Grimes, E. Hector, K. Lawson, M. J. Leneman, D. Masongsong, E. V. Russell, C. L. Wilkins, C. Hinkley, D. Blake, J. B. Adair, N. Allen, M. Anderson, M. Arreola-Zamora, M. Artinger, J. Asher, J. Branchevsky, D. Capitelli, M. R. Castro, R. Chao, G. Chung, N. Cliffe, M. Colton, K. Costello, C. Depe, D. Domae, B. W. Eldin, S. Fitzgibbon, L. Flemming, A. Fox, I. Frederick, D. M. Gilbert, A. Gildemeister, A. Gonzalez, A. Hesford, B. Jha, S. Kang, N. King, J. Krieger, R. Lian, K. Mao, J. McKinney, E. Miller, J. P. Norris, A. Nuesca, M. Palla, A. Park, E. S. Y. Pedersen, C. E. Qu, Z. Rozario, R. Rye, E. Seaton, R. Subramanian, A. Sundin, S. R. Tan, A. Turner, W. Villegas, A. J. Wasden, M. Wing, G. Wong, C. Xie, E. Yamamoto, S. Yap, R. Zarifian, A. Zhang, G. Y. Earth Planetary and Space Sciences Department University of California Los Angeles USA Institute of Geophysics and Planetary Physics University of California Los Angeles USA Tyvak Nano-Satellite Systems Inc. Irvine USA Johns Hopkins University Applied Physics Laboratory Laurel USA Department of Astronomy and Center for Space Physics Boston University Boston USA Mechanical and Aerospace Engineering Department Henry Samueli School of Engineering University of California Los Angeles USA GFZ German Research Centre for Geosciences Potsdam Germany Saint Petersburg State University St. Petersburg Russia Northrop Grumman Aerospace Systems Redondo Beach USA Raytheon Space and Airborne Systems El Segundo USA The Aerospace Corporation El Segundo USA Millenium Space Systems El Segundo USA Aptiv Agoura Hills USA Physics and Astronomy Department University of California Los Angeles USA The Boeing Company Long Beach USA SF Motors Santa Clara USA SpaceX Hawthorne USA Planet Labs Inc. San Francisco USA Computer Science Department Henry Samueli School of Engineering University of California Los Angeles USA Electrical and Computer Engineering Department Henry Samueli School of Engineering University of California Los Angeles USA Jet Propulsion Laboratory Pasadena USA Mercedes-Benz Research and Development North America Long Beach USA Epic Systems Corporation Verona USA California State Polytechnic University Pomona USA Economics Department University of California Los Angeles USA Experior Laboratories Oxnard USA Mathematics Department University of California Los Angeles USA Qualcomm San Diego USA

Correction to: Space Sci. Rev. (2020) 216: 103 Affiliation 2 in this article is the wrong affiliation that instead should read: “institute of Geophysics and Planetary Physics, University of California, Los Angeles, C...

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Carbogen inhalation during non-convulsive status epilepticus: A quantitative analysis of EEG recordings

arXiv

引用

arXiv 2019年

作者： Ramaraju, S. Reichert, S. Wang, Y. Forsyth, R. Taylor, P.N. Interdisciplinary Computing and Complex Bio-Systems Group School of Computing Science Newcastle University United Kingdom Department of Electrical Engineering Medical Engineering and Computer Science Offenburg University of Applied Sciences Germany Institute of Neuroscience Faculty of Medical Science Newcastle University United Kingdom

Objective: To quantify the effect of inhaled 5% carbon-dioxide/95% oxygen on EEG recordings from patients in non-convulsive status epilepticus (NCSE). Methods: Five children of mixed aetiology in NCSE were given high flow of inhaled carbogen (5% carbon dioxide/95% oxygen) using a face mask for maximum 120s. EEG was recorded concurrently in all patients. The effects of inhaled carbogen on patient EEG recordings were investigated using band-power, functional connectivity and graph theory measures. Carbogen effect was quantified by measuring effect size (Cohen's d) between "before", "during" and "after" carbogen delivery states. Results: Carbogen's apparent effect on EEG band-power and network metrics across all patients for "before-during" and "before-after" inhalation comparisons was inconsistent across the five patients. Conclusion: The changes in different measures suggest a potentially non-homogeneous effect of carbogen on the patients' EEG. Different aetiology and duration of the inhalation may underlie these non-homogeneous effects. Tuning the carbogen parameters (such as ratio between CO2 and O2, duration of inhalation) on a personalised basis may improve seizure suppression in future. Copyright © 2019, The Authors. All rights reserved.

关键词： Carbon dioxide

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Diffusive topological transport in spatiotemporal thermal lattices

arXiv

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arXiv 2021年

作者： Xu, Guoqiang Yang, Yihao Zhou, Xue Chen, Hongsheng Alù, Andrea Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Kent Ridge117583 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou China School of Computer Science and Information Engineering Chongqing Technology and Business University Chongqing400067 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China International Joint Innovation Center ZJU-UIUC Institute The Electromagnetics Academy at Zhejiang University Zhejiang University Haining314400 China Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

Topological insulating phases are usually found in periodic lattices stemming from collective resonant effects, and it may thus be expected that similar features may be prohibited in thermal diffusion, given its purely dissipative and largely incoherent nature. We report the diffusion-based topological states supported by spatiotemporally-modulated advections stacked over a fluidic surface, thereby imitating a periodic propagating potential in effective thermal lattices. We observe edge and bulk states within purely nontrivial and trivial lattices, respectively. At interfaces between these two types of lattices, the diffusive system exhibits interface states, manifesting inhomogeneous thermal properties on the fluidic surface. Our findings establish a framework for topological diffusion and thermal edge/bulk states, and it may empower a distinct mechanism for flexible manipulation of robust heat and mass transfer. © 2021, CC BY.

关键词： Interface states

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Non-equilibrium thermodynamics of charge separation in organic solar cells

arXiv

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arXiv 2019年

作者： Kaiser, W. Janković, V. Vukmirović, N. Gagliardi, A. Department of Electrical and Computer Engineering Technical University of Munich KarlstraÃ e 45 Munich80333 Germany Scientific Computing Laboratory Center for the Study of Complex Systems Institute of Physics Belgrade University of Belgrade Pregrevica 118 Belgrade11080 Serbia

This work presents a novel theoretical description of the non-equilibrium thermodynamics of charge separation process in organic solar cells (OSCs). Using the theory of stochastic thermodynamics, we connect the phonon-assisted dynamics and recombination of electron-hole pairs within a photo-excited organic bilayer with the thermodynamic free energy. We analyze the impact of energetic disorder and delocalization on the free energy, average energy and entropy. For high energetic disorder, the site population is well described by equilibrium. We observe significant deviations from equilibrium for delocalized electron-hole pairs at small energetic disorder, representing efficient OSCs. Our results emphasize that both a large Gibbs entropy and large initial separation are required to achieve efficient charge separation. A decrease in free energy barrier with increased distances between charges does not necessarily correlate with the separation yield. Our presented framework can further shed light on the transient thermodynamic free energy, allowing previously inaccessible insight into the individual thermodynamic contributions from energy and entropy on sub-ns timescales. Transient simulations reveal large Gibbs entropy on ps-timescales for even highest disorder, which may explain the efficient separation of "hot" CT states. Copyright © 2019, The Authors. All rights reserved.

关键词： Organic solar cells

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Bayesian Sequential Experimental Design for Stochastic Kriging with Jackknife Error Estimates

Bayesian Sequential Experimental Design for Stochastic Krigi...

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Simulation Winter Conference

作者： Guowei Sun Yunchuan Li Michael C. Fu Department of Mathematics University of Maryland College Park MD USA Department of Electrical and Computer Engineering University of Maryland College Park MD USA Robert H. Smith Business School Institute for Systems Research University of Maryland College Park MD USA

ISBN: (数字)9781728132839

ISBN: (纸本)9781728120522

We propose a fully sequential experimental design procedure for stochastic kriging (SK) methodology of fitting unknown response surfaces from simulation experiments. The procedure first estimates the current SK model performance by jackknifing the existing data points. Then, an additional SK model is fitted on the jackknife error estimates to capture the landscape of the current SK model performance. Methodologies for balancing exploration and exploitation trade-off in Bayesian optimization are employed to select the next simulation point. Compared to experimental design procedures, our method is robust to the SK model specifications. We design a dynamic allocation algorithm, which we call kriging-based dynamic stochastic kriging (KDSK), and illustrate its performance through two numerical experiments.

关键词： Predictive models Stochastic processes Data models Mathematical model Computational modeling Bayes methods Sun

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Ultrasound beam steering with flattened acoustic metamaterial luneburg lens

arXiv

引用

arXiv 2019年

作者： Zhao, Liuxian Laredo, Eitan Ryan, Olivia Yazdkhasti, Amirhossein Kim, Hyun-Tae Ganye, Randy Horiuchi, Timothy Yu, Miao Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Mechanical and Industrial Engineering University of Massachusetts Amherst MA01002 United States Department of Electrical Engineering Roger Williams University BristolRI02809 United States Department of Mechanical Engineering University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States

We report ultrasound beam steering based on 2D and 3D flattened acoustic metamaterial Luneburg lenses at 40 kHz. The effective properties of the lenses are obtained by using the quasi-conformal transformation (QCT) technique and solving the Laplace equation with Dirichlet and Neumann boundary conditions. A 2D lens and a 3D lens were designed and fabricated. The numerical and experimental results with these lenses demonstrate excellent beam steering performance of ultrasonic waves in both near field and far field. Copyright © 2019, The Authors. All rights reserved.

关键词： Conformal mapping

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Entropy measurement of a strongly coupled quantum dot

arXiv

引用

arXiv 2021年

作者： Child, Timothy Sheekey, Owen Lüscher, Silvia Fallahi, Saeed Gardner, Geoffrey C. Manfra, Michael Mitchell, Andrew Sela, Eran Kleeorin, Yaakov Meir, Yigal Folk, Joshua Stewart Blusson Quantum Matter Institute University of British Columbia VancouverBCV6T1Z4 Canada Department of Physics and Astronomy University of British Columbia VancouverBCV6T1Z1 Canada Department of Physics and Astronomy Purdue University West LafayetteIN United States Birck Nanotechnology Center Purdue University West LafayetteIN United States School of Materials Engineering Purdue University West LafayetteIN United States Elmore Family School of Electrical and Computer Engineering Purdue University West LafayetteIN United States School of Physics University College Dublin Belfield Dublin 4 Ireland Centre for Quantum Engineering Science and Technology University College Dublin Dublin 4 Ireland Raymond and Beverly Sackler School of Physics and Astronomy Tel-Aviv University Tel AvivIL-69978 Israel Center for the Physics of Evolving Systems University of Chicago ChicagoIL60637 United States Department of Physics Ben-Gurion University of the Negev Beer Sheva84105 Israel The Ilse Katz Institute for Nanoscale Science and Technology Ben-Gurion University of the Negev Beer Sheva84105 Israel

The spin 1/2 entropy of electrons trapped in a quantum dot has previously been measured with great accuracy, but the protocol used for that measurement is valid only within a restrictive set of conditions. Here, we demonstrate a novel entropy measurement protocol that is universal for arbitrary mesoscopic circuits and apply this new approach to measure the entropy of a quantum dot hybridized with a reservoir, where Kondo correlations typically dominate spin physics. The experimental results match closely to numerical renormalization group (NRG) calculations for small and intermediate coupling. For the largest couplings investigated in this work, NRG predicts a suppression of spin entropy at the charge transition due to the formation of a Kondo singlet, but that suppression is not observed in the experiment. © 2021, CC BY.

关键词： Semiconductor quantum dots

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Design and Implementation of OLED Driving and OPD Readout Circuitry for an Optical Vibration Sensor 17

Design and Implementation of OLED Driving and OPD Readout Ci...

引用

17th IEEE SENSORS Conference, SENSORS 2018

作者： Wu, Yi-Cheng Kao, Yung-Hua Chao, Paul C.-P. Wey, Chin-Long Sauter, Thilo Eka, Fitrah P. Pandey, Rajeev Department of Electrical Engineering National Chiao Tung University Hsinchu300 Taiwan Institute of Electrical and Control Engineering National Chiao Tung University Hsinchu City Taiwan EECS International Graduate Program National Chiao Tung University Hsinchu City Taiwan Department for Integrated Sensor Systems Danube University Krems Austria Department of Electrical and Computer Engineering National Chiao Tung University Hsinchu City Taiwan

ISBN: (纸本)9781538647073

This study presents an organic light-emitting diode (OLED) drive circuit and an organic photo detector (OPD) readout circuits for a vibration sensor. Vibration sensor consist of micro-electro-mechanical systems (MEMS), which are OLED and OPD needs to be integrated for many applications in automation or consumer electronics. The light flux is generated by an OLED located on top of the structure and the modulated light flux is measured by an OPD. The OLED drive circuit contains pulse width modulation (PWM) driver to control PWM output for optimization of voltage operation is designed in order to minimize power consumption efficiency of device. The readout circuit includes a trans-impedance amplifier (TIA) to convert incident light of OPD to voltage output, a 14-bit analog-to-digital converter (ADC) to extract amplitude of vibration level, circuit to generate clock for time-to-digital converter (TDC) which detect frequency of vibration sensor. The designed circuit has been successfully fabricated by using TSMC 0.18 μm CMOS process, the chip area is 1.012 mm2. The power consumption of chip is about 6.2 mW. The measured frequency of PWM is about 200 kHz with 50% duty cycle. The frequency range of the vibration can be sensed well as about 10 Hz1.5 kHz, and resulting in high SNR at frequencies under 60 Hz. © 2018 IEEE.

关键词： Electric power utilization

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