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arXiv 2020年

作者： Liu, Ajian Li, Xuan Wan, Jun Liang, Yanyan Escalera, Sergio Escalante, Hugo Jair Madadi, Meysam Jin, Yi Wu, Zhuoyuan Yu, Xiaogang Tan, Zichang Yuan, Qi Yang, Ruikun Zhou, Benjia Guo, Guodong Li, Stan Z. Faculty of Information Technology Avenida WaiLong Taipa Macau China School of Computer and Information Technology Beijing Jiaotong University Beijing China National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Science Beijing China Universitat de Barcelona and Computer Vision Center Barcelona Instituto Nacional de Astrofísica Óptica y Electrónica Puebla Mexico School of Software Beihang University Beijing China Institute of Deep Learning Baidu Research and National Engineering Laboratory for Deep Learning Technology and Application Beijing Westlake University Hangzhou China

Face anti-spoofing is critical to prevent face recognition systems from a security breach. The biometrics community has achieved impressive progress recently due the excellent performance of deep neural networks and the availability of large datasets. Although ethnic bias has been verified to severely affect the performance of face recognition systems, it still remains an open research problem in face anti-spoofing. Recently, a multi-ethnic face anti-spoofing dataset, CASIA-SURF CeFA, has been released with the goal of measuring the ethnic bias. It is the largest up to date cross-ethnicity face anti-spoofing dataset covering 3 ethnicities, 3 modalities, 1;607 subjects, 2D plus 3D attack types, and the first dataset including explicit ethnic labels among the recently released datasets for face *** organized the Chalearn Face Anti-spoofing Attack Detection Challenge which consists of single-modal (e.g., RGB) and multi-modal (e.g., RGB, Depth, Infrared (IR)) tracks around this novel resource to boost research aiming to alleviate the ethnic bias. Both tracks have attracted 340 teams in the development stage, and finally 11 and 8 teams have submitted their codes in the single-modal and multi-modal face anti-spoofing recognition challenges, respectively. All the results were verified and re-ran by the organizing team, and the results were used for the final ranking. This paper presents an overview of the challenge, including its design, evaluation protocol and a summary of results. We analyze the top ranked solutions and draw conclusions derived from the competition. In addition we outline future work directions. Copyright © 2020, The Authors. All rights reserved.

关键词： Large dataset

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Hyperpolarizability measurement of plasmonic meta-atoms in metasurfaces

Hyperpolarizability measurement of plasmonic meta-atoms in m...

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Nonlinear Photonics, NP 2020

作者： Bin-Alam, M. Saad Awan, Kashif M. Kiviniemi, Antti Baxter, Joshua Mamchur, Yaryna Lesina, Antonio Cala Ramunno, Lora Huttunen, Mikko J. Dolgaleva, Ksenia School of Electrical Engineering and Computer Science University of Ottawa OttawaONK1N 6N5 Canada Stewart Blusson Quantum Matter Institute University of British Columbia VancouverBCV6T 1Z4 Canada Photonics Laboratory Physics Unit Tampere University TampereFI-33014 Finland Department of Physics University of Ottawa OttawaONK1N 6N5 Canada National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute Kyiv Ukraine

Here, we experimentally determine the order-of-magnitude value of the 1st-order hyperpolarizability of plasmonic meta-atoms in metasurfaces. This result will prove useful in designing nonlinear metasurfaces for a vari... 详细信息

ISBN: (纸本)9781943580798

关键词： Plasmonics

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Air-to-air communications beyond 5G: A novel 3D CoMP transmission scheme

arXiv

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arXiv 2020年

作者： Li, Yan Miridakis, Nikolaos I. Tsiftsis, Theodoros A. Yang, Guanghua Xia, Minghua School of Electronics and Information Technology Sun Yat-sen University Guangzhou510006 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082 China Institute of Physical Internet School of Electrical and Information Engineering Jinan University Zhuhai519070 China Dept. of Informatics and Computer Engineering University of West Attica 12243 Greece Dept. of Informatics University of Piraeus 18534 Greece School of Intelligent Systems Science and Engineering Jinan University Zhuhai519070 China Institute of Physical Internet Jinan University Zhuhai519070 China

In this paper, a novel 3D cellular model consisting of aerial base stations (aBSs) and aerial user equipments (aUEs) is proposed, by integrating the coordinated multi-point (CoMP) transmission technique with the theory of stochastic geometry. For this new 3D architecture, a tractable model for aBSs' deployment based on binomial Delaunay-tetrahedralization is developed, which ensures seamless coverage for a given space. In addition, a versatile and practical frequency allocation scheme is designed to eliminate the inter-cell interference effectively. Based on this model, performance metrics including the ergodic data rate and coverage probability are derived for two types of aUEs: i) general aUE (i.e., an aUE having distinct distances from its serving aBSs) and ii) the worst-case aUE (i.e., an aUE having equal distances from its serving aBSs). Simulation and numerical results demonstrate that the proposed approach emphatically outperforms the conventional binomial-Voronoi tessellation without CoMP. Insightfully, it provides a similar performance as to the binomial-Voronoi tessellation which utilizes the conventional CoMP scheme;yet, introducing a considerably reduced computational complexity and backhaul/signaling overhead. Copyright © 2020, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Adaptive Fuzzy Sliding Mode Control for Active Front Steering System

Adaptive Fuzzy Sliding Mode Control for Active Front Steerin...

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Chinese Control Conference (CCC)

作者： Tian Tian Liandi Fang Shihong Ding Wei Xing Zheng School of Electrical and Information Engineering Jiangsu University Zhenjiang P. R. China College of Mathematics and Computer Science Tongling University Tongling P. R. China High-tech Key Laboratory of Agricultural Equipment and Intelligence of Jiangsu Province Zhenjiang P. R. China School of Computing Engineering and Mathematics Western Sydney University Sydney NSW Australia

ISBN: (数字)9789881563903

ISBN: (纸本)9781728165233

In order to alleviate the adverse effects of uncertainty in the active front steering (AFS) system, a new type of observer is designed in this paper that can simultaneously estimate the sideslip angle and disturbance, which provides the controller with accurate compensation and simplifies the system model. In addition, an active front steering controller based on adaptive fuzzy sliding mode (AFSM) is proposed, which uses adaptive algorithms to adjust and update fuzzy system parameters in real time. The stability of the closed-loop AFS system based on the Lyapunov stability theory is analyzed. Compared with traditional PI control, the simulation results show the effectiveness of the proposed AFSM control method.

关键词： Stability analysis Observers Fuzzy logic Atmospheric modeling Load modeling Sliding mode control Vehicle dynamics

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Passivity of Reaction-Diffusion Neural Networks Via Sampled-Data Control

Passivity of Reaction-Diffusion Neural Networks Via Sampled-...

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IEEE Symposium Series on Computational Intelligence (SSCI)

作者： Zi-Peng Wang Huai-Ning Wu Wu-Hua Chen Jin-Liang Wang School of Electrical Engineering University of Jinan Jinan China Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing China College of Mathematics and Information Science Guangxi University Nanning China School of Computer Science and Software Engineering Tianjin Polytechnic University Tianjin China

ISBN: (数字)9781728124858

ISBN: (纸本)9781728124865

A sampled-data (SD) control is introduced for passivity of reaction-diffusion neural networks (RDNNs). With an appropriate Lyapunov functional (LF), a SD control design is developed based on linear matrix inequalities to guarantee the passivity of closed-loop RDNNs. Lastly, we provide a numerical example to support the presented method.

关键词： Artificial neural networks Linear matrix inequalities Control design Closed loop systems Lyapunov methods Microcontrollers Sampled data systems

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Energy efficiency maximization in ris-aided cell-free network with limited backhaul

arXiv

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arXiv 2020年

作者： Le, Quang Nhat Nguyen, Van-Dinh Dobre, Octavia A. Zhao, Ruiqin Department of Electrical and Computer Engineering Memorial University St. John'sNLA1B 3X9 Canada University of Luxembourg L-1855 Luxembourg Key Laboratory of Ocean Acoustics and Sensing School of Marine Science and Technology Northwestern Polytechnical University Xi'an710072 China

Integrating the reconfigurable intelligent surface in a cell-free (RIS-CF) network is an effective solution to improve the capacity and coverage of future wireless systems with low cost and power consumption. The reflecting coefficients of RISs can be programmed to enhance signals received at users. This letter addresses a joint design of transmit beamformers at access points and reflecting coefficients at RISs to maximize the energy efficiency (EE) of RIS-CF networks, taking into account the limited backhaul capacity constraints. Due to a very computationally challenging nonconvex problem, we develop a simple yet efficient alternating descent algorithm for its solution. Numerical results verify that the EE of RIS-CF networks is greatly improved, showing the benefit of using RISs. Copyright © 2020, The Authors. All rights reserved.

关键词： Energy efficiency

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Microscopic nonlinear optical response of plasmonic meta-atoms

Microscopic nonlinear optical response of plasmonic meta-ato...

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2020 Frontiers in Optics Conference, FiO 2020

We experimentally measure the microscopic 2nd-order nonlinear optical response of plasmonic meta-atoms known as the 1st-order hyperpolarizability. This result is crucial to design nonlinear metasurfaces consisting of ... 详细信息

ISBN: (纸本)9781943580804

关键词： Plasmonics

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Hybrid plasmonic high Q-factor resonances in a periodic metasurface

Hybrid plasmonic high Q-factor resonances in a periodic meta...

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Frontiers in Optics, FIO 2019 - Part of Frontiers in Optics + Laser science APS/DLS

作者： Saad-Bin-Alam, Md. Reshef, Orad Huttunen, Mikko J. Carlow, Graham Sullivan, Brian Ménard, Jean-Michel Boyd, Robert W. Dolgaleva, Ksenia School of Electrical Engineering and Computer Science University of Ottawa OttawaONK1N 6N5 Canada Department of Physics University of Ottawa OttawaONK1N 6N5 Canada Laboratory of Photonics Tampere University TampereFI-33100 Finland Institute of Optics and Department of Physics and Astronomy University of Rochester RochesterNY14627 United States Iridian Spectral Technologies Inc. 2700 Swansea Crescent OttawaONK1G 6R8 Canada

By tuning the thickness of a micrometer-thin cladding-layer on top of a plasmonic metasurface, we experimentally split a broad localized surface plasmon resonance into a series of narrower high Q-factor resonances. &#... 详细信息

ISBN: (纸本)9781943580675

关键词： Plasmonics

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Opacity of Nondeterministic Transition Systems: A (Bi)Simulation Relation Approach

Opacity of Nondeterministic Transition Systems: A (Bi)Simula...

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作者： Zhang, Kuize Yin, Xiang Zamani, Majid ACCESS Linnaeus Center School of Electrical Engineering KTH Royal Institute of Technology Stockholm10044 Sweden Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Shanghai200240 China Computer Science Department University of Colorado Boulder BoulderCO80309 United States

In this paper, we propose several opacity-preserving (bi)simulation relations for nondeterministic transition systems (NTSs) in terms of initial-state opacity, current-state opacity, K-step opacity, and infinite-step opacity. We also show how one can leverage quotient constructions to compute such relations. As a result, although the opacity verification problem for infinite NTSs is generally undecidable, if one can find such an opacity-preserving relation from an infinite NTS to a finite one, the (lack of) opacity of the infinite NTS can be easily verified over the finite one, which is decidable. © 1963-2012 IEEE.

关键词： Opacity

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Cogging Torque Reduction by Stepped Slot-Opening Shift for Interior Permanent Magnet Motors

Cogging Torque Reduction by Stepped Slot-Opening Shift for I...

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International Conference on electrical Machines and Systems (ICEMS)

作者： Junchen Zhao Jin Wang Libing Zhou Weihua Huang Yiming Ma Zhiwei Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (School of Electrical and Electronic Engineering) Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering The Ohio State University Columbus OH USA

This paper proposes a stepped slot-opening shift method to reduce the cogging torque of the interior permanent magnet motors. In the proposed method, the slot-openings are segmented along the motor axis and shifted respectively. Keeping the slot-opening width and the central position of the slots remain the same, it can achieve the effect of minimizing cogging torque similar to the skewing slots method, while maintaining the three-phase symmetry of the motor. Firstly, based on the theoretical analysis of the resultant cogging torque, the working principle of the stepped slot-opening shift method is given. Then, considering the impact of the local magnetic saturation in the rotor core, two improved stepped slot-opening shift methods are proposed by 2-dimensional finite element analysis (FEA)-first, the stepped slot-openings with optimal shift angles and, second, the stepped slot-openings with optimal step lengths. Furthermore, the electromagnetic torque and back electromotive force before and after the stepped slot-opening shift are compared and analyzed.

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