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IEEE Power engineering Society Conference and Exposition in Africa, PowerAfrica

作者： Steven Rosen Paranietharan Arunagirinathan Iroshani Jayawardene Ganesh K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Holcombe Department of Electrical and Computer Engineering Clemson University Clemson SC USA Eskom Centre of Excellence in HVDC Engineering University of KwaZulu-Natal Durban South Africa

The integration of renewables, such as solar and wind power, introduces new challenges for existing multi-area power system operations. These variable generation sources are transforming the grid into a more dynamic system which significantly affects real-time operation. With dynamic generation, supply and demand will deviate frequently over time causing severe frequency fluctuations. The generators on the grid must respond rapidly to these fluctuations in order to stabilize the system and ultimately return to nominal frequency. In this paper, a 210 MW photovoltaic (PV) plant is integrated into a two-area four-machine power system. Due to the output variations of the PV plant, especially during cloudy conditions, the system frequency will significantly fluctuate. The objective of this paper is the optimal tuning of governors on synchronous generators in order to damp and mitigate frequency deviations as fast as possible. The governor parameters are tuned using a heuristic optimization method to provide the least number of frequency events and minimum frequency deviation with varying penetration levels of PV power. With optimally tuned governor parameters, a multi-area power system can operate reliably while maximizing the utilization of clean power generation sources.

关键词： Generators Tuning Power system stability Time-frequency analysis Real-time systems Automatic generation control

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Photonic frequency conversion for dynamic spectral access and signal remoting

Photonic frequency conversion for dynamic spectral access an...

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IEEE Photonics Conference (IPC)

作者： Andrew J. Stark Michael D. Merritt Jerrod Langston Charles Middleton Richard DeSalvo Stephen E. Ralph Georgia Tech Research Institute Atlanta USA Electrical and Computer Engineering Department Georgia Institute of Technology Atlanta GA USA Harris Corporation-Space and Intelligent Systems Melbourne FL USA

ISBN: (纸本)9781509019076

The rapidly changing RF landscape creates a requirement for flexible frequency access as well as the ability to move signals over long distances. This paper presents the characterization and experiments of a wide band photonics enabled transceiver. The architecture, SFDR, noise figure, and gain are presented, followed by the results of communications experiments involving up to 25 km of remoting fiber and up to 40 GHz RF frequency.

关键词： OFDM Photonics Radio frequency Transceivers Frequency conversion Bandwidth Gain

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Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers

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Physical Review B 2017年第22期95卷 224405-224405页

作者： S. A. Montoya S. Couture J. J. Chess J. C. T. Lee N. Kent M.-Y. Im S. D. Kevan P. Fischer B. J. McMorran S. Roy V. Lomakin E. E. Fullerton Center for Memory and Recording Research University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California San Diego La Jolla California 92093 USA Space and Naval Warfare Systems Center - Pacific San Diego California 92152 USA Department of Physics University of Oregon Eugene Oregon 97401 USA Center for X-Ray Optics Lawrence Berkeley National Laboratory Berkeley California 94720 USA Physics Department University of California Santa Cruz California 94056 USA Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology Daegu Korea Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

The dynamic response of dipole skyrmions in Fe/Gd multilayer films is investigated by ferromagnetic resonance measurements and compared to micromagnetic simulations. We detail thickness- and temperature-dependent studies of the observed modes as well as the effects of magnetic field history on the resonant spectra. Correlation between the modes and the magnetic phase maps constructed from real-space imaging and scattering patterns allows us to conclude that the resonant modes arise from local topological features such as dipole skyrmions but do not depend on the collective response of a close-packed lattice of these chiral textures. Using micromagnetic modeling, we are able to quantitatively reproduce our experimental observations which suggests the existence of localized spin-wave modes that are dependent on the helicity of the dipole skyrmion. We identify four localized spin-wave excitations for the skyrmions that are excited under either in-plane or out-of-plane rf fields. Lastly we show that dipole skyrmions and nonchiral bubble domains exhibit qualitatively different localized spin-wave modes.

关键词： Magnetic susceptibility Magnetism Micromagnetism Skyrmions Spin waves

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Adaptive optimization for active queue management supporting TCP flows

Adaptive optimization for active queue management supporting...

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American Control Conference

作者： Simone Baldi Elias B. Kosmatopoulos Andreas Pitsillides Marios Lestas Petros A. Ioannou Yiming Wan Delft Center of Systems and Control Netherlands Dept. of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Computer Science Department University of Cyprus (UCY) Nicosia Cyprus Department of Electrical Engineering Frederick University Nicosia Cyprus Department of Electrical Engineering University of Southern California Los Angeles USA

ISBN: (纸本)9781467386838

An adaptive decentralized strategy for active queue management of TCP flows over communication networks is presented. The proposed strategy solves locally, at each link, an optimal control problem, minimizing a cost composed of residual capacity and buffer queue size. The solution of the optimal control problem exploits an adaptive optimization algorithm aiming at adaptively minimizing a suitable approximation of the Hamilton-Jacobi-Bellman equation associated with the optimal control problem. Simulations results, obtained by using a fluid flow based model of the communication network and a common network topology, show improvement with respect to the Random Early Detection strategy. Besides, it is shown that the performance of the proposed decentralized solution is comparable with the performance obtained with a centralized strategy, which solves the optimal control problem via a central unit that maintains the flow states of the entire network.

关键词： Protocols Communication networks Optimal control Mathematical model Delays Optimization networks(communications) Optimal control rotation management adaptive optimization protocols Mathematical Model Telecommunications Tritolyl Phosphates tactical command post Network topology delay Residual Volume fluid flow

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Accelerating FPGA-based object detection via a visual information extraction cascade 15

Accelerating FPGA-based object detection via a visual inform...

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9th International Conference on Distributed Smart Cameras, ICDSC 2015

作者： Kyrkou, Christos Theocharides, Theocharis Department of Electrical and Computer Engineering KIOS Research Centre for Intelligent Systems and Networks University of Cyprus Cyprus

ISBN: (纸本)9781450336819

Object detection is a major step in several computer vision applications. Recent advances in hardware acceleration for real-time object detection feature extensive use of reconfigurable hardware fabric (Field Programmable Gate Arrays - FPGAs), and relevant research has produce quite fascinating results, in both accuracy of the detection algorithm, as well as the performance in terms of frames per second (FPS) for use in embedded systems. Detecting objects in images however, is a daunting task, and involves steps which are hardware- inefficient, both in terms of the datapath design and in terms of input/output and memory accesses. In this work, we present how a visual information extraction cascade composed of disparity estimation, edge detection and motion detection, can help in significantly reducing the data that needs to be computed. As such, it can reduce the power consumption while improving the performance of object detection algorithms. Initial results indicate data search reduction of up to 87% in the best case, with an average of more than 50%. © 2015 ACM.

关键词： Object detection

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Optimal design of chip-on-the-tip endoscope with a large depth of field

Optimal design of chip-on-the-tip endoscope with a large dep...

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Frontiers in Optics 2015, FIO 2015

作者： Qiang, Wang Lee, Sukhan Intelligent Systems Research Institute Electrical and Computer Engineering Sungkyunkwan Universtiy Suwon2066 Korea Republic of

ISBN: (纸本)9781943580033

This paper presents a novel objective lens design for an endoscope of extremely small diameter in a Chip-on-the-Tip (COT) configuration. The design provides 8mm DOF at a close distance, between 2mm and 10mm, from the object with 140 degree FOV, while allowing to be compactly packaged into a 1 mm diameter and 3 mm length. © OSA 2015.

关键词： Endoscopy

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Direct measurement of the cosmic-ray proton spectrum from 50 gev to 10 tev with the calorimetric electron telescope on the international space station

arXiv

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arXiv 2019年

作者： Adriani, O. Akaike, Y. Asano, K. Asaoka, Y. Bagliesi, M.G. Berti, E. Bigongiari, G. Binns, W.R. Bonechi, S. Bongi, M. Bruno, A. Buckley, J.H. Cannady, N. Castellini, G. Checchia, C. Cherry, M.L. Collazuol, G. Di Felice, V. Ebisawa, K. Fuke, H. Guzik, T.G. Hams, T. Hasebe, N. Hibino, K. Ichimura, M. Ioka, K. Ishizaki, W. Israel, M.H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kohri, K. Krawczynski, H.S. Krizmanic, J.F. Lomtadze, T. Maestro, P. Marrocchesi, P.S. Messineo, A.M. Mitchell, J.W. Miyake, S. Moiseev, A.A. Mori, K. Mori, M. Mori, N. Motz, H.M. Munakata, K. Murakami, H. Nakahira, S. Nishimura, J. de Nolfo, G.A. Okuno, S. Ormes, J.F. Ozawa, S. Pacini, L. Palma, F. Papini, P. Penacchioni, A.V. Rauch, B.F. Ricciarini, S.B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Sparvoli, R. Spillantini, P. Stolzi, F. Suh, J.E. Sulaj, A. Takahashi, I. Takayanagi, M. Takita, M. Tamura, T. Terasawa, T. Tomida, H. Torii, S. Tsunesada, Y. Uchihori, Y. Ueno, S. Vannuccini, E. Wefel, J.P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Department of Physics University of Florence Via Sansone Sesto Fiorentino1 - 50019 Italy INFN Sezione di Florence Via Sansone Sesto Fiorentino1 - 50019 Italy Department of Physics University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba277-8582 Japan Waseda Research Institute for Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki305-8505 Japan Department of Physical Sciences Earth and Environment University of Siena via Roma 56 Siena53100 Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 Pisa56127 Italy Department of Physics and McDonnell Center for the Space Sciences Washington University One Brookings Drive St. LouisMO63130-4899 United States Heliospheric Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton RougeLA70803 United States Via Madonna del Piano 10 Sesto Fiorentino50019 Italy Department of Physics and Astronomy University of Padova Via Marzolo 8 Padova35131 Italy INFN Sezione di Padova Via Marzolo 8 Padova35131 Italy University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 Rome00133 Italy INFN Sezione di Rome "Tor Vergata" Via della Ricerca Scientifica 1 Rome00133 Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa252-5210 Japan CRESST and Astroparticle Physics Laboratory NASA GSFC GreenbeltMD20771 United States Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama Kanagawa221-8686 Japan Faculty of Science and Technology Graduate School of Scien

In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation period used in this analysis is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved the very wide energy range necessary to carry out measurements of the spectrum from 50 GeV to 10 TeV covering, for the first time in space, with a single instrument the whole energy interval previously investigated in most cases in separate subranges by magnetic spectrometers (BESS-TeV, PAMELA, and AMS-02) and calorimetric instruments (ATIC, CREAM, and NUCLEON). The observed spectrum is consistent with AMS-02 but extends to nearly an order of magnitude higher energy, showing a very smooth transition of the power-law spectral index from −2.81 ± 0.03 (50-500 GeV) neglecting solar modulation effects (or −2.87 ± 0.06 including solar modulation effects in the lower energy region) to −2.56 ± 0.04 (1-10 TeV), thereby confirming the existence of spectral hardening and providing evidence of a deviation from a single power law by more than 3σ. Copyright © 2019, The Authors. All rights reserved.

关键词： Cosmology

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Variable selection in identification of a high dimensional nonlinear non-parametric system

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Control Theory and Technology 2015年第1期13卷 1-16页

作者： Er-Wei BAI Wenxiao ZHAO Weixing ZHENG Department of Electrical and Computer Engineering University of Iowa School of Electronics Electrical Engineering and Computer Science Queen's UniversityBelfast U.K. Key Laboratory of Systems and Control Academy of Mathematics and Systems Science National Center for Mathematics and Interdisciplinary Sciences Chinese Academy of Sciences School of Computing Engineering and Mathematics University of Western Sydney

The problem of variable selection in system identification of a high dimensional nonlinear non-parametric system is described. The inherent difficulty, the curse of dimensionality, is introduced. Then its connections to various topics and research areas are briefly discussed, including order determination, pattern recognition, data mining, machine learning, statistical regression and manifold embedding. Finally, some results of variable selection in system identification in the recent literature are presented.

关键词： System identification variable selection nonlinear non-parametric system curse of dimensionality

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Design and modeling of a compact rotational nonlinear spring

Design and modeling of a compact rotational nonlinear spring

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IEEE/RSJ International Conference on intelligent Robots and systems

作者： Hamed Jalaly Bidgoly Majid Nili Ahmadabadi Mohammad Reza Zakerzadeh Cognitive Robotics Laboratory The Control and Intelligent Processing Center of Excellence (CIPCE) School of Electrical and Computer Engineering College of Engineering University of Tehran Iran Dynamic and Vibration Laboratory School of Mechanical Engineering College of Engineering University of Tehran Iran

ISBN: (纸本)9781509037636

In this paper, we propose a new method for implementing a rotational nonlinear spring with user defined profile, based on the combination of a linear spring with a nonlinear transmission mechanism. The proposed structure consists of a non-circular cam, a roller which moves along outer circumference of the cam, and a stretched translational linear spring which is connected between center of the cam and center of the roller. We obtain a set of differential equations to design shape of the cam for any given torque-angle profile. Also, it will be shown that profiles with both positive and negative values can be implemented by the proposed method. At last, the cam of some popular nonlinear springs are designed, including constant, cubic, hyperbolic tangent and sinusoidal springs.

关键词： computer aided manufacturing Camelopardalis Hookean spring springs Device Spring TRANSFER MECHANISM Modeling nonlinearity Rotational SCROLL Differential equations Spring season

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Advanced cell-level control for extending electric vehicle battery pack lifetime

Advanced cell-level control for extending electric vehicle b...

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IEEE Energy Conversion Congress and Exposition

作者： M. Muneeb Ur Rehman Fan Zhang Michael Evzelman Regan Zane Kandler Smith Dragan Maksimovic Electrical and Computer Engineering Utah State University Logan Utah - USA 84341 Electrical Computer and Energy Engineering University of Colorado Boulder Boulder Colorado - USA 80309 Transportation Systems and Hydrogen Center National Renewable Energy Laboratory Golden CO - USA 80401

ISBN: (纸本)9781509007387

A cell-level control approach for electric vehicle battery packs is presented that enhances traditional battery balancing goals to not only provide cell balancing but also achieve significant pack lifetime extension. These goals are achieved by applying a new life-prognostic based control algorithm that biases individual cells differently based on their state of charge, capacity and internal resistance. The proposed life control approach reduces growth in capacity mismatch typically seen in large battery packs over life while optimizing usable energy of the pack. The result is a longer lifetime of the overall pack and a more homogeneous distribution of cell capacities at the end of the first life for vehicle applications. Active cell balancing circuits and associated algorithms are used to accomplish the cell-level life extension objectives. This paper presents details of the cell-level control approach, selection and design of the active balancing system, and low-complexity state-of-charge, capacity, and series-resistance estimation algorithms. A laboratory prototype is used to demonstrate the proposed control approach. The prototype consists of twenty-one 25 Ah Panasonic lithium-Ion NMC battery cells from a commercial electric vehicle and an integrated BMS/DC-DC system that provides 750 W to the vehicle low voltage auxiliary loads.

关键词： State of charge Batteries computer architecture Microprocessors Resistance Electric vehicles Discharges (electric)

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