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arXiv 2018年

作者： Petković, Tomislav Puljiz, David Marković, Ivan Hein, Björn University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering Laboratory for Autonomous Systems and Mobile Robotics Unska 3 ZagrebHR-10000 Croatia Karlsruhe Institute of Technology Institute for Anthropomatics and Robotics Intelligent Process Automation and Robotics Lab Kaiserstraße 12 Deutschland KarlsruheDE-76131

With the substantial growth of logistics businesses the need for larger warehouses and their automation arises, thus using robots as assistants to human workers is becoming a priority. In order to operate efficiently and safely, robot assistants or the supervising system should recognize human intentions in real-time. Theory of mind (ToM) is an intuitive human conception of other humans' mental state, i.e., beliefs and desires, and how they cause behavior. In this paper we propose a ToM based human intention estimation algorithm for flexible robotized warehouses. We observe human's, i.e., worker's motion and validate it with respect to the goal locations using generalized Voronoi diagram based path planning. These observations are then processed by the proposed hidden Markov model framework which estimates worker intentions in an online manner, capable of handling changing environments. To test the proposed intention estimation we ran experiments in a real-world laboratory warehouse with a worker wearing Microsoft Hololens augmented reality glasses. Furthermore, in order to demonstrate the scalability of the approach to larger warehouses, we propose to use virtual reality digital warehouse twins in order to realistically simulate worker behavior. We conducted intention estimation experiments in the larger warehouse digital twin with up to 24 running robots. We demonstrate that the proposed framework estimates warehouse worker intentions precisely and in the end we discuss the experimental results. Copyright © 2018, The Authors. All rights reserved.

关键词： Virtual reality

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Graphene-loaded metal wire grating for deep and broadband THz modulation in total internal reflection geometry

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Photonics Research 2018年第12期6卷 1151-1157页

作者： YIWEN SUN RICCARDO DEGLJINNOCENTI DAVID A.RITCHIE HARVEY E.BEERE LONG XIAO MICHAEL RUGGIERO J.AXEL ZEITLER RAYKO I.STANTCHEV DANNI CHEN ZHENGCHUN PENG EMMA MACPHERSON XUDONG LIU National-Regional Key Technology Engineering Laboratory for Medical Ultrasound Guangdong Key Laboratory for Biomedical Measurements and Ultrasound ImagingDepartment of Biomedical EngineeringSchool of MedicineShenzhen UniversityShenzhen 518060China Cavendish Laboratory University of CambridgeJ J Thomson AvenueCambridge CB30HEUK Department of Electrical Engineering and Computer Science Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Department of Chemistry University of Vermont82 University PlaceBurlingtonVermont 05405USA Department of Chemical Engineering and Biotechnology University of CambridgePembroke StreetCambridge CB2 3RAUK Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Key Laboratory of Ministry of Education for Optoelectronic Devices and Systems College of Optoelectronic EngineeringShenzhen University Shenzhen 518060China Department of Physics University of WarwickGibbet Hill RoadCoventry CV4 7ALUK

We employed a metallic wire grating loaded with graphene and operating in total internal reflection (TIR) geometry to realize deep and broadband THz modulation. The non-resonant field enhancement effect of the evanescent wave in TIR geometry and in the subwavelength wire grating was combined to demonstrate a ～77% modulation depth (MD) in the frequency range of 0.2–1.4 THz. This MD, achieved electrically with a SiO_2∕Si gated graphene device, was 4.5 times higher than that of the device without a metal grating in transmission geometry. By optimizing the parameters of the metallic wire grating, the required sheet conductivity of graphene for deep modulation was lowered to 0.87 mS. This work has potential applications in THz communication and real-time THz imaging.

关键词： modulation depth (MD) graphene Wire grating

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Robustness to adversarial examples through an ensemble of specialists

arXiv

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arXiv 2017年

作者： Abbasi, Mahdieh Gagné, Christian Computer Vision and Systems Laboratory Electrical and Computer Engineering Department Université Laval QuébecQC Canada

Due to the recent breakthroughs achieved by Convolutional Neural Networks (CNNs) for various computer vision tasks (He et al., 2015;Taigman et al., 2014;Karpathy et al., 2014), CNNs are highly regarded technology for inclusion into real-life vision applications. However, CNNs have a high risk of failing due to adversarial examples, which fool them consistently with the addition of small perturbations to natural images, undetectable by the human eyes. Copyright © 2017, The Authors. All rights reserved.

关键词： Neural networks

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Long-term wind accommodation of interconnected power grids via HVDC tie-line based on aggregate unit model

Long-term wind accommodation of interconnected power grids v...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Zeng, Fangdi Bie, Zhaohong Han, Zifen Li, Xiaofei Zhi, Yong Zhang, Yankai School of Electrical Engineering Xi'an Jiaotong University Xi'an China State Grid Gansu Electric Power Company Lanzhou China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China Electric Power Research Institute State Grid Gansu Electric Power Company Lanzhou China

ISBN: (纸本)9781538614273

In the interconnected power grids, the wind energy can be accommodated in the wider area by optimizing the tie line power flows and coordinating the multi-area generation resources. Therefore, a sequential simulation method considering the flexible operation of high voltage direct current (HVDC) tie lines is presented in the paper to analyze the wind accommodation in the long-term horizon. To speed the computation for long-term simulation, the aggregate unit model is considered to reduce the number of integer variables by clustering a large number of individual units into a few of unit groups. In addition, a rolling calculation strategy is adopted for the simulation of a year. In the end, a case study is conducted to show the feasibility and effectiveness of the proposed method. © 2017 IEEE.

关键词： Aggregates

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Relay selection in full-duplex energy-harvesting two-way relay networks

Relay selection in full-duplex energy-harvesting two-way rel...

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作者： Wang, Dexin Zhang, Rongqing Cheng, Xiang Yang, Liuqing Chen, Chen Department of Electrical and Computer Engineering Colorado State University Fort CollinsCO80523 United States State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computing Sciences Peking University Beijing100871 China

In this paper, we investigate the relay selection (RS) problem in full-duplex (FD) two-way relay networks, where the relays are wirelessly powered by harvesting a portion of the received signal power from the sources. To the best of the authors' knowledge, this is the first investigation of FD two-way relays with simultaneous wireless and information transfer capabilities. For each relay, we prove the quasi convexity of the power splitting (PS) factor optimization, and obtain the optimal PS factor in terms of the outage probability by linear search. Both single relay selection (SRS) and general relay selection (GRS) without the limit on the number of cooperating relays are investigated and the corresponding RS methods are proposed. Since the optimal GRS problem is computationally intractable with exponential complexity, we propose several low-complexity heuristic GRS methods based on various relay ordering and greedy selection criteria. Simulations indicate that the proposed GRS methods perform better than the SRS methods and achieve very similar performance compared with the optimal RS method achieved by exhaustive search but with dramatically reduced complexity. © 2017 IEEE.

关键词： Energy harvesting

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A Routing Optimization Model for EMS of power systems Considering Cyber-Physical Interdependence

A Routing Optimization Model for EMS of Power Systems Consid...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Luo Xu Qinglai Guo Hongbin Sun Zhuo Su State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Guangdong Province Power Dispatching and Control Center

ISBN: (纸本)9781538614280

The development of smart grids makes the dependence of power systems on information systems increasing. However, the optimal routing of power communication networks does not mean the routing for power systems is optimal. Besides, power communication networks are different from ordinary, public communication networks, as the secondary system of power systems, the primary purpose is to ensure the reliability of power systems. Based on the cyber-physical sensitivity analysis, the importance of information flow can be evaluated. Then, a dynamic CPS optimal routing model distinguishing the importance of information flow is proposed to configure more reliable and shorter path to higher importance information flow. Case study on different scenarios of a modified IEEE 14-bus system demonstrates the validity of the proposed routing optimization model.

关键词： Cyber-physical system (CPS) EMS Information-energy model Optimal routing model power communication network

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Research on Optimization Matching of Wind/Solar/Hydro/Storage Flexibility Resource System Considering Electric Vehicle Access

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IOP Conference Series: Materials Science and engineering 2019年第1期486卷

作者： Chunhui Qu Wenwen Sun Siyu Tao Qingshan Xu Bo Yang State Key Laboratory of Operation and Control of Renewable Energy& Storage Systems China Electric Power Research Institute Beijing 100192 China College of Electrical Engineering Southeast University Nanjing 210096 China State Grid Liaoning Electric Power Company Limited Economic Research Institute Liaoning 110015 China

With the development of distributed generation technology and the requirement of power system flexibility, the research on multiple flexible resource optimization is carried out. Based on the traditional optimal configuration of wind-solar-hydro-storage system, this paper takes electric vehicle into consideration. Firstly, the model of each flexible resource is established. Then, a comprehensive evaluation index system is built. Taking the flexible resources in a city on the eastern coast of China as a case, multi-objective grey wolf optimization algorithm and entropy weight method are applied to do the optimization and evaluation. The simulation result shows that in the optimal configuration, not only the renewable resources can be effectively utilized, but also the requirement of load in different period can be meet. Moreover, the total investment can be greatly reduced. In addition, the participation of electric vehicles can not only improve the performance of the hybrid system, but also increase the income of EV holders.

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High temperature superconducting technology for future all-electric ships - (PPT)

High temperature superconducting technology for future all-e...

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IEEE Electric Ship Technologies Symposium

作者： Sastry Pamidi Lukas Graber Center for Advanced Power Systems Florida State University Electrical and Computer Engineering FAMU-FSU College of Engineering Tallahassee Florida Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia

ISBN: (纸本)9781509049455

Both the 5 MW and 36.5 MW motors are helium gas cooled. Operate at ～ 30 K - Typically applications with substantial magnetic field need to operate at lower temperatures to compensate for the reduction in critical current due to the magnetic field. The motors have rotors superconducting and stators are made of copper. HTS materials do have AC losses if operated under time-varying magnetic field or current. Low AC loss HTS conductor needs to be developed for realizing fully superconducting motors and generators. Low AC loss conductor is under development.

关键词： High-temperature superconductors Superconducting cables Marine vehicles power cables Tutorials

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Invariant Attribute Profiles: A Spatial-Frequency Joint Feature Extractor for Hyperspectral Image Classification

arXiv

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arXiv 2019年

作者： Hong, Danfeng Wu, Xin Ghamisi, Pedram Chanussot, Jocelyn Yokoya, Naoto Zhu, Xiao Xiang Wessling82234 Germany Munich80333 Germany School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Fractional Signals and Systems Beijing100081 China Machine Learning Group Exploration Division Helmholtz Institute Freiberg for Resource Technology Helmholtz-Zentrum Dresden-Rossendorf Freiberg09599 Germany Univ. Grenoble Alpes INRIA CNRS Grenoble INP LJK GrenobleF-38000 France Faculty of Electrical and Computer Engineering University of Iceland Reykjavik101 Iceland RIKEN Tokyo103-0027 Japan

This is the pre-acceptance version, to read the final version please go to IEEE Transactions on Geoscience and Remote Sensing on IEEE Xplore. Up to the present, an enormous number of advanced techniques have been developed to enhance and extract the spatially semantic information in hyperspectral image processing and analysis. However, locally semantic change, such as scene composition, relative position between objects, spectral variability caused by illumination, atmospheric effects, and material mixture, has been less frequently investigated in modeling spatial information. As a consequence, identifying the same materials from spatially different scenes or positions can be difficult. In this paper, we propose a solution to address this issue by locally extracting invariant features from hyperspectral imagery (HSI) in both spatial and frequency domains, using a method called invariant attribute profiles (IAPs). IAPs extract the spatial invariant features by exploiting isotropic filter banks or convolutional kernels on HSI and spatial aggregation techniques (e.g., superpixel segmentation) in the Cartesian coordinate system. Furthermore, they model invariant behaviors (e.g., shift, rotation) by the means of a continuous histogram of oriented gradients constructed in a Fourier polar coordinate. This yields a combinatorial representation of spatial-frequency invariant features with application to HSI classification. Extensive experiments conducted on three promising hyperspectral datasets (Houston2013 and Houston2018) demonstrate the superiority and effectiveness of the proposed IAP method in comparison with several state-of-the-art profile-related techniques. The codes will be Copyright © 2019, The Authors. All rights reserved.

关键词： Remote sensing

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Recover feasible solutions for SOCP relaxation of optimal power flow problems in mesh networks

arXiv

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arXiv 2017年

作者： Tian, Zhuang Wu, Wenchuan State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China

—Convex relaxation methods have been studied and used extensively to obtain an optimal solution to the optimal power flow (OPF) problem. Meanwhile, convex relaxed power flow equations are also prerequisites for efficiently solving a wide range of problems in power systems including mixed-integer nonlinear programming (MINLP) and distributed optimization. When the exactness of convex relaxations is not guaranteed, it is important to recover a feasible solution for the convex relaxation methods. This paper presents an alternative convex optimization (ACP) approach that can efficiently recover a feasible solution from the result of second-order cone programming (SOCP) relaxed OPF in mesh networks. The OPF problem is first formulated as a difference-of-convex (DC) programming problem, then efficiently solved by a penalty convex concave procedure (CCP). CCP iteratively linearizes the concave parts of the power flow constraints and solves a convex approximation of the DCP problem. Numerical tests show that the proposed method can find a global or near-global optimal solution to the AC OPF problem, and outperforms those semidefinite programming (SDP) based algorithms. Copyright © 2017, The Authors. All rights reserved.

关键词： Acoustic generators

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