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arXiv 2021年

作者： Song, Yue Liu, Tao Hill, David J. The Department of Control Science and Engineering Tongji University Shanghai201804 China The National Key Laboratory of Autonomous Intelligent Unmanned Systems Shanghai201210 China The Frontiers Science Center for Intelligent Autonomous Systems Ministry of Education Shanghai200120 China Hong Kong The HKU Shenzhen Institute of Research and Innovation Shenzhen China The Department of Electrical and Computer Systems Engineering Monash University MelbourneVIC3000 Australia The Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong

This paper incorporates a continuous-type network flexibility into chance constrained economic dispatch (CCED). In the proposed model, both power generations and line susceptances are continuous variables to minimize the expected generation cost and guarantee a low probability of constraint violation in terms of generations and line flows under renewable uncertainties. From the analytical form of CCED, we figure out the mechanism of network flexibility against uncertainties-while renewable uncertainties shrink the usable line capacities and aggravate transmission congestion, network flexibility mitigates congestion by re-routing the base-case line flows and reducing the line capacity shrinkage caused by uncertainties. Further, we propose an alternate iteration solver for this problem. By duality theory, we set up a master problem in the form of second-order cone programming to optimize generation dispatch scheme and a subproblem in the form of linear programming to optimize line susceptances. A satisfactory solution can be obtained efficiently by alternately solving these two problems. The proposed method applies to both Gaussian uncertainty and non-Gaussian uncertainty by means of Gaussian mixture model. The case studies on the IEEE 14-bus system and IEEE 118-bus system suggest that network flexibility can significantly improve operational economy while ensuring security under uncertainties. © 2021, CC BY.

关键词： Second-order cone programming

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Spin-phonon interaction in yttrium iron garnet

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Physical Review B 2021年第2期104卷 L020401-L020401页

作者： Kevin S. Olsson Jeongheon Choe Martin Rodriguez-Vega Guru Khalsa Nicole A. Benedek Jiaming He Bin Fang Jianshi Zhou Gregory A. Fiete Xiaoqin Li Department of Physics Center of Complex Quantum Systems The University of Texas at Austin Austin Texas 78712 USA Department of Computer and Electrical Engineering University of Maryland College Park Maryland 20740 USA Center for Dynamics and Control of Materials The University of Texas at Austin Austin Texas 78712 USA Department of Physics Northeastern University Boston Massachusetts 02115 USA Department of Materials Science and Engineering Cornell University Ithaca New York 14853 USA Department of Mechanical Engineering The University of Texas at Austin Austin Texas 78712 USA Texas Materials Institute The University of Texas at Austin Austin Texas 78712 USA Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

Spin-phonon interaction is an important channel for spin and energy relaxation in magnetic insulators. Understanding this interaction is critical for developing magnetic insulator-based spintronic devices. Quantifying this interaction in yttrium iron garnet (YIG), one of the most extensively investigated magnetic insulators, remains challenging because of the large number of atoms in a unit cell. Here, we report temperature-dependent and polarization-resolved Raman measurements in a YIG bulk crystal. We first classify the phonon modes based on their symmetry. We then develop a modified mean-field theory and define a symmetry-adapted parameter to quantify spin-phonon interaction in a phonon-mode specific way in YIG. Based on this improved mean-field theory, we discover a positive correlation between the spin-phonon interaction strength and the phonon frequency.

关键词： Phonons Spin caloritronics Spintronics Magnetic insulators Density functional calculations Landau-Ginzburg-Wilson theory Mean field theory Pseudopotentials Raman spectroscopy

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IC-U-Net: A U-Net-based denoising autoencoder using mixtures of independent components for automatic EEG artifact removal

arXiv

引用

arXiv 2021年

作者： Chuang, Chun-Hsiang Chang, Kong-Yi Huang, Chih-Sheng Jung, Tzyy-Ping Research Center for Education and Mind Sciences College of Education National Tsing Hua University Hsinchu Taiwan Institute of Information Systems and Applications College of Electrical Engineering and Computer Science National Tsing Hua University Hsinchu Taiwan Department of Computer Science and Engineering National Taiwan Ocean University Keelung Taiwan Department of Artificial Intelligence Research and Development Elan Microelectronics Corporation Hsinchu Taiwan Institute of Engineering in Medicine Institute for Neural Computation University of California San Diego La Jolla United States

Electroencephalography (EEG) signals are often contaminated with artifacts. It is imperative to develop a practical and reliable artifact removal method to prevent misinterpretations of neural signals and underperformance of brain-computer interfaces. This study developed a new artifact removal method, IC-U-Net, which is based on the U-Net architecture for removing pervasive EEG artifacts and reconstructing brain sources. The IC-U-Net was trained using mixtures of brain and non-brain sources decomposed by independent component analysis and employed an ensemble of loss functions to model complex signal fluctuations in EEG recordings. The effectiveness of the proposed method in recovering brain sources and removing various artifacts (e.g., eye blinks/movements, muscle activities, and line/channel noises) was demonstrated in a simulation study and three real-world EEG datasets collected at rest and while driving and walking. IC-U-Net is user-friendly and publicly available, does not require parameter tuning or artifact type designations, and has no limitations on channel numbers. Given the increasing need to image natural brain dynamics in a mobile setting, ICU-Net offers a promising end-to-end solution for automatically removing artifacts from EEG recordings. Copyright © 2021, The Authors. All rights reserved.

关键词： Electroencephalography

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Unsupervised Domain Adaptation on Person Re-Identification via Dual-level Asymmetric Mutual Learning

arXiv

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arXiv 2023年

作者： Wu, Qiong Li, Jiahan Dai, Pingyang Ye, Qixiang Cao, Liujuan Wu, Yongjian Ji, Rongrong Institute of Artificial Intelligence The Media Analytics and Computing Laboratory Department of Artificial Intelligence School of Informatics Xiamen University Xiamen361005 China School of Information and Control Engineering China University of Mining and Technology Xuzhou221000 China The Media Analytics and Computing Laboratory Department of Artificial Intelligence School of Informatics Xiamen University Xiamen361005 China The Peng Cheng Laboratory Shenzhen518066 China The School of Electronics Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China The Media Analytics and Computing Lab Department of Computer Science School of Informatics Xiamen University Xiamen361005 China The Youtu Laboratory Tencent Shanghai200233 China The Fujian Engineering Research Center of Trusted Artificial Intelligence Analysis and Application Institute of Artificial Intelligence Xiamen University Xiamen361005 China

Unsupervised domain adaptation person re-identification (Re-ID) aims to identify pedestrian images within an unlabeled target domain with an auxiliary labeled source-domain dataset. Many existing works attempt to recover reliable identity information by considering multiple homogeneous networks. And take these generated labels to train the model in the target domain. However, these homogeneous networks identify people in approximate subspaces and equally exchange their knowledge with others or their mean net to improve their ability, inevitably limiting the scope of available knowledge and putting them into the same mistake. This paper proposes a Dual-level Asymmetric Mutual Learning method (DAML) to learn discriminative representations from a broader knowledge scope with diverse embedding spaces. Specifically, two heterogeneous networks mutually learn knowledge from asymmetric subspaces through the pseudo label generation in a hard distillation manner. The knowledge transfer between two networks is based on an asymmetric mutual learning manner. The teacher network learns to identify both the target and source domain while adapting to the target domain distribution based on the knowledge of the student. Meanwhile, the student network is trained on the target dataset and employs the ground-truth label through the knowledge of the teacher. Extensive experiments in Market-1501, CUHK-SYSU, and MSMT17 public datasets verified the superiority of DAML over state-of-the-arts. Copyright © 2023, The Authors. All rights reserved.

关键词： Distillation

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Barrier lyapunov function-based fixed-time FTC for high-order nonlinear systems with predefined tracking accuracy

Research Square

引用

Research Square 2021年

作者： Wang, Xiaolin Xu, Jihui Lv, Maolong Zhang, Lei Zhao, Zilong Department of Equipment Management UAV Engineering College Air Force Engineering University Shaanxi Xi’an710051 China Delft Center for Systems and Control Delft University of Technology Mekelweg 2 Delft2628 CD Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Van Mourik Broekmanweg 6 Delft2628 XE Netherlands

This article proposes a fixed-time adaptive fault-tolerant control methodology for a larger class of high-order nonlinear systems subject to full-state constraints and actuator faults. In contrast with the state-of-the-art results, the distinguishing feature of our control design consists in proposing a novel high-order tan-type barrier Lyapunov function (BLF) which ensures state variables to be some asymmetric time-varying compact sets under tan-type constraints and expands the application range of tan-type BLF (i.e., from low-order to high-order, from symmetric time-invariant to asymmetric time-varying). Apart from this, the proposed control design ensures the tracking errors converge to specified residual sets within fixed-time and makes the size of the convergence regions of tracking errors adjustable a priori by means of a new BLF-based tuning function and a projection operator. A variable-separable lemma is delicately embedded into the control design to extract the control terms in a linear-like fashion which not only overcomes the difficulty that virtual control signals appear in a non-affine manner, but also solves the problem of actuator faults. Comparative simulations results finally validate the effectiveness of the proposed scheme. © 2021, CC BY.

关键词： Lyapunov functions

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Broadband focusing of acoustic plasmons in graphene with an applied current

arXiv

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arXiv 2021年

作者： Sammon, Michael Margetis, Dionisios Mele, E.J. Low, Tony Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States Institute for Physical Science and Technology Department of Mathematics Center for Scientific Computation and Mathematical Modeling University of Maryland College ParkMD20742 United States Dept. of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States

Non-reciprocal plasmons in current-driven, isotropic, and homogenous graphene with proximal metallic gates is theoretically explored. Nearby metallic gates screen the Coulomb interactions, leading to linearly dispersive acoustic plasmons residing close to its particle-hole continuum counterpart. We show that the applied bias leads to spectral broadband focused plasmons whose resonance linewidth is dependent on the angular direction relative to the current flow due to Landau damping. We predict that forward focused non-reciprocal plasmons are possible with accessible experimental parameters and setup. © 2021, CC BY.

关键词： Plasmons

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EigenMPC: An Eigenmanifold-Inspired Model-Predictive control Framework for Exciting Efficient Oscillations in Mechanical Systems

EigenMPC: An Eigenmanifold-Inspired Model-Predictive Control...

引用

IEEE Conference on Decision and control

作者： Andre Coelho Alin Albu-Schaeffer Arne Sachtler Hrishik Mishra Davide Bicego Christian Ott Antonio Franchi Institute of Robotics and Mechatronics of the German Aerospace Center (DLR) Oberpfaffenhofen Germany Dextrous Robotics Inc Memphis TN USA Robotics and Mechatronics Lab Faculty of Electrical Engineering Mathematics & Computer Science University of Twente Netherlands Department of Informatics Technical University of Munich Germany Automation and Control Institute (ACIN) Technical University of Vienna Austria LAAS-CNRS University of Toulouse France

ISBN: (数字)9781665467612

ISBN: (纸本)9781665467629

This paper proposes a Nonlinear Model-Predictive control (NMPC) method capable of finding and converging to energy-efficient regular oscillations, which require no control action to be sustained. The approach builds up on the recently developed Eigenmanifold theory, which defines the sets of line-shaped oscillations of a robot as an invariant two-dimensional submanifold of its state space. By defining the control problem as a nonlinear program (NLP), the controller is able to deal with constraints in the state and control variables and be energy-efficient not only in its final trajectory but also during the convergence phase. An initial implementation of this approach is proposed, analyzed, and tested in simulation.

关键词： Analytical models Aerospace electronics Energy efficiency Trajectory Mechanical systems Oscillators Robots

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Stable and Efficient Structures in Multigroup Network Formation

arXiv

引用

arXiv 2020年

作者： Mohagheghi, Shadi Ma, Jingying Bullo, Francesco Department of Electrical and Computer Engineering Center for Control Dynamical Systems and Computation University of California at Santa Barbara Santa BarbaraCA93106-9560 United States School of Mathematics and Statistics Ningxia University Yinchuan750021 China

In this work we present a strategic network formation model predicting the emergence of multigroup structures. Individuals decide to form or remove links based on the benefits and costs those connections carry;we focus on bilateral consent for link formation. An exogenous system specifies the frequency of coordination issues arising among the groups. We are interested in structures that arise to resolve coordination issues and, specifically, structures in which groups are linked through bridging, redundant, and co-membership interconnections. We characterize the conditions under which certain structures are stable and study their efficiency as well as the convergence of formation dynamics. Copyright © 2020, The Authors. All rights reserved.

关键词： Game theory

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One Apollonius Circle is Enough for Many Pursuit-Evasion Games

arXiv

引用

arXiv 2021年

作者： Dorothy, Michael Maity, Dipankar Shishika, Daigo Von Moll, Alexander Computational and Information Sciences Directorate Army Research Laboratory APG MD United States Department of Electrical and Computer Engineering University of North Carolina CharlotteNC United States Department of Mechanical Engineering George Mason University FairfaxVA United States Control Science Center Air Force Research Laboratory WPAFB OH United States

This paper investigates obstacle-free simple motion pursuit-evasion problems where the pursuer is faster and game termination is point capture. It is well known that the interior of the Apollonius Circle (AC) is the evader’s dominance region, however, it was unclear whether the evader could reach outside the initial AC without being captured. We construct a pursuit strategy that guarantees the capture of an evader within an arbitrarily close neighborhood of the initial AC. The pursuer strategy is derived by reformulating the game into a nonlinear control problem, and the guarantee holds against any admissible evader strategy. Our result implies that the evader can freely select the capture location, but only inside the initial AC. Therefore, a class of problems, including those where the payoff is determined solely based on the location of capture, are now trivial. © 2021, CC BY.

关键词： Lyapunov methods

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Three-Phase D-STATCOM with Digital Current control Strategy in abc-Reference Frame

Three-Phase D-STATCOM with Digital Current Control Strategy ...

引用

International Conference on Computing, Mathematics and engineering Technologies (iCoMET)

作者： Tiago Davi Curi Busarello Kamran Zeb Muhammad Asim Sarwar Hee Je Kim Depart. Control Automation and Computation Engineering Federal University of Santa Catarina - UFSC Blumenau Brazil School of Electrical Engineering School of Electrical Engineering and Computer Science. Pusan National University National University of Sciences and Technology Busan South Korea Department Of Electrical Engineering Sukkur IBA University Pakistan School of Electrical Engineering Pusan National University Busan South Korea

ISBN: (数字)9781728149707

ISBN: (纸本)9781728149714

This paper proposes a Three-phase D-STATCOM with digital current control strategy in abc- reference frame. The proposal D-STATCOM does not use a PLL and the reactive power is transferred to the grid through controlling the D-STATCOM output current. The current controller has one zero and two poles. This type of controller is also known as Type-2 controller. The procedure to tune the controller is explained. The Conservative Power Theory (CPT) is used to compute the reactive power of the loads. A case study shows the behavior of the D-STACOM during initialization, during load transitions and during steady-state conditions. The results show the efficacy of the proposed D-STATCOM.

关键词： Automatic voltage control Reactive power Transfer functions Phase locked loops Mathematical model Filtering theory

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