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arXiv 2019年

作者： Yao, Bing Mu, Yarong Sun, Yirong Sun, Hui Zhang, Xiaohui Wang, Hongyu Su, Jing Zhang, Mingjun Yang, Sihua Zhao, Meimei Wang, Xiaomin Ma, Fei Yao, Ming Yang, Chao Xie, Jianming College of Mathematics and Statistics Northwest Normal University Lanzhou730070 China School of Information Engineering Lanzhou University of Finance and Economics Lanzhou730030 China College of Science Gansu Agricultural University Lanzhou730070 China School of Electronics Engineering and Computer Science Peking University Beijing100871 China Department of Information Process and Control Engineering Lanzhou Petrochemical College of Vocational Technology Lanzhou730060 China School of Mathematics Physics & Statistics Shanghai University of Engineering Science Shanghai201620 China Department of Mathematics Lanzhou City University Lanzhou730070 China School of Electronics and Information Engineering Lanzhou Jiaotong University Lanzhou730070 China

Graphical passwords (GPWs) are in many areas of the current world, in which the two-dimensional code has been applied successfully nowadays. Topological graphic passwords (Topsnut-gpws) are a new type of cryptography, and they differ from the existing GPWs. A Topsnut-gpw consists of two parts: one is a topological structure (graph), and one is a set of discrete elements (a graph labelling, or coloring), the topological structure connects these discrete elements together to form an interesting "story". It is not easy to remember passwords made up of longer bytes for many Chinese people. Chinese characters are naturally topological structures and have very high information density, especially, Chinese couplets form natively public keys and private keys in authentication. Our idea is to transform Chinese characters into computer and electronic equipments with touch screen by speaking, writing and keyboard for forming Hanzi-gpws (one type of Topsnut-gpws). We will translate Chinese characters into graphs (Hanzi-graphs), and apply mathematical techniques (graph labellings) to construct Hanzi-gpws, and next using Hanzi-gpws produces text-based passwords (TB-paws) with longer bytes as desired. We will explore a new topic of encrypting networks by means of algebraic groups, called graphic groups (Ablian additive finite group), and construct several kinds of self-similar Hanzi-networks, as well as some approaches for the encryption of networks, an important topic of researching information security. The stroke order of writing Chinese characters motivates us to study directed Hanzi-gpws based on directed graphs. We will introduce flawed graph labellings on disconnected Hanzi-graphs such that each Hanzi-gpw with a flawed graph labelling can form a set of connected Topsnut-gpws, like a group. Moreover, we introduce connections between different graphic groups that can be used to encrypt networks based on community partition. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphic methods

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Human intention estimation based on hidden Markov model motion validation for safe flexible robotized warehouses

arXiv

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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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Distributed Least Squares Solver for Network Linear Equations

arXiv

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arXiv 2018年

作者： Yang, Tao George, Jemin Qin, Jiahu Yi, Xinlei Wu, Junfeng State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang110819 China U.S. Army Research Laboratory AdelphiMD20783 United States Department of Automation University of Science and Technology of China Hefei230027 China Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm100 44 Sweden College of Control Science and Engineering Zhejiang University Hangzhou310027 China

In this paper, we study the problem of finding the least square solutions of over-determined linear algebraic equations over networks in a distributed manner. Each node has access to one of the linear equations and holds a dynamic state. We first propose a distributed least square solver over connected undirected interaction graphs and establish a necessary and sufficient on the step-size under which the algorithm exponentially converges to the least square solution. Next, we develop a distributed least square solver over strongly connected directed graphs and show that the proposed algorithm exponentially converges to the least square solution provided the step-size is sufficiently small. Moreover, we develop a finite-time least square solver by equipping the proposed algorithms with a finite-time decentralized computation mechanism. The theoretical findings are validated and illustrated by numerical simulation examples. Copyright © 2018, The Authors. All rights reserved.

关键词： Linear equations

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Monitoring and control of the timber's drying process

Monitoring and control of the timber's drying process

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International Conference on Engineering of Modern Electric Systems (EMES)

作者： Mircea Dulău Istvan Madaras Department of Electrical and Computer Engineering “Petru Maior” University Tîrgu-Mureş Romania Master at Automatic Systems of Industrial Process Control Faculty of Engineering “Petru Maior” University Tîrgu-Mureş Romania

The timber's drying process is a mandatory operation before any action of the wood processing. In the recent years, the fundamental research in the field of timber's drying has made progress, the physical laws regarding the removal of the water from the wood through different procedures (convection, vacuum, microwave etc.) being elucidated. The using of the calculus techniques allows the accurate simulation of heat and mass transfer phenomena, as well as of the mechanical aspects (internal stresses, deformations), which accompany the wood's drying process. The paper presents the implementation of the monitoring and the control system of the timber's conventional drying, using programmable controllers (Siemens), dedicated devices and dedicated software (Step 7).

关键词： Moisture Heating systems Monitoring process control Fans Heat transfer

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Towards autonomous reconfiguration in distribution networks: An approach based on finite state automaton models

Towards autonomous reconfiguration in distribution networks:...

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International Conference in Energy and Sustainability in Small Developing Economies (ES2DE)

作者： Alena Košťálová Pedro M. S. Carvalho Marek Kubalčík Dep. of Computer and Communication Systems Tomas Bata University in Zlin Czech Republic Electrical Engineering and Computer Dep. Instituto Superior Tecnico Lisbon Portugal Department of Process Control Tomas Bata University in Zlin Czech Republic

The demand on distribution network reconfiguration abilities is increasing. This paper proposes a Finite State Automaton model of a distribution network that deals with topologically safe reconfiguration. Autonomous operation of distribution networks can be designed, analysed and implemented in day-to-day operation with the aid of these automata: through supervisory control. Two approaches to supervisor design are proposed. One for the normal operating mode and the other for the contingency mode. Simple and comprehensive examples illustrate the approaches.

关键词： Switches Automata Power cables Substations Electronic mail Power system reliability

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Topological-darkness-assisted phase regulation for atomically thin meta-optics

arXiv

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arXiv 2019年

作者： Wang, Yingwei Deng, Zi-Lan Hu, Dejiao Yuan, Jian Ou, Qingdong Qin, Fei Zhang, Yinan Ouyang, Xu Peng, Bo Cao, Yaoyu Guan, Bai-Ou Zhang, Yupeng He, Jun Qiu, Chengwei Bao, Qiaoliang Li, Xiangping Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou510632 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University 932 South Lushan Road Changsha Hunan410083 China College of Physics and Electronic Information Huaibei Normal University Huaibei235000 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Electronic Science and Technology Shenzhen University Shenzhen518060 China Monash University ClaytonVIC3800 Australia National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated Devices School of Microelectronics and Solid State Electronics University of Electronic Science and Technology of China Chengdu610054 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117583 Singapore

Two-dimensional (2D) noble-metal dichalcogenides 1, 2 have emerged as a new platform for the realization of versatile flat optics with a considerable degree of miniaturization. However, light field manipulation at the atomic scale is widely considered unattainable since the vanishing thickness and intrinsic losses of 2D materials completely suppress both resonances and phase accumulation effects. Empowered by conventionally perceived adverse effects of intrinsic losses, we show that the structured PtSe2 films integrated with a uniform substrate can regulate nontrivial singular phase and realize atomic-thick meta-optics in the presence of topological darkness 3, 4. We experimentally demonstrate a series of atomic-thick binary meta-optics that allows angle-robust and high unit-thickness diffraction efficiency of 0.96%/nm in visible frequencies, given its thickness of merely 4.3 nm. Our results unlock the potential of a new class of 2D flat optics for light field manipulation at an atomic thickness. Copyright © 2019, The Authors. All rights reserved.

关键词： Platinum compounds

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Active Disturbance Rejection control in Stribeck Friction Dynamic Compensation for High-accuracy Servo Systems 35

Active Disturbance Rejection Control in Stribeck Friction Dy...

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第35届中国控制会议

作者： WANG Lijun JIAO Ruihua LI Qing YIN Yixin ZHENG Qing School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education Department of Electrical and Computer Engineering Gannon University

ISBN: (纸本)9781509009107

The servo systems are always difficult to design with high-accuracy due to nonlinear stick-slip at the low velocities and the uncertainties of friction dynamic model.A linear active disturbance rejection control(ADRC) dynamic compensation solution is presented independent of the friction *** deal with the problem of observing or tracking for unknown discontinuous signals of friction with Stribeck effect,a kind of linear extended state observer(LESO) algorithm is *** a linear control law is proposed to compensate the friction disturbance *** comparison with proportional-integral-derivative(PID) controller,the simulation results show that the proposed method not only has better accuracy of the discontinuous friction signal tracking,but also ensures better dynamic friction compensation at the low velocities.

关键词： Disturbance rejection Extended state observer Servo systems Stribeck friction Discontinuous tracking

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Solving dynamic optimization problems based on an improved clustering quantum-behaved particle swarm optimizer

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Journal of Computational and Theoretical Nanoscience 2016年第6期13卷 3540-3547页

作者： Fang, Wei Wang, Mengmei Li, Chaofeng Key Laboratory of Advanced Process Control for Light Industry Department of Computer Science and Technology School of IoT Engineering Jiangnan University Wuxi Jiangsu214122 China

Solving dynamic optimization problems (DOPs) has become a hot research area in recent years. In this paper, an improved Quantum-behaved particle swarm optimizer (QPSO) with hierarchical clustering technique is proposed to solve DOPs in terms of the dynamics and complexity. By studying the trajectory of particles and the effect of local attractor in QPSO, Gaussian distribution is used to sample the local attractor in order to alleviate premature convergence and enhance the global search ability. Two variants of the proposed Gaussian distributed are also studied in this paper. For the hierarchical clustering technique, each particle is regarded as one cluster in the initial stage. With the evolutionary procedure, the clusters merge into new sub-swarms when the distances between them are less than a threshold, which is used for tracking the movement of peaks. The convergence check, overcrowding check, and overlapping check are appointed during the clustering procedure in order to keep swarm diversity. The performance of the improved QPSO with gaussian sampling and clustering technique is evaluated on a set of benchmark functions and compared with some state-of-art algorithms. Experimental results show the efficiency of the proposed approach. Copyright © 2016 American Scientific Publishers. All rights reserved.

关键词： Gaussian distribution

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An Approach to the Polytopic Representation of Time-Varying Uncertain Systems with Reduced Complexity and Conservatism

An Approach to the Polytopic Representation of Time-Varying ...

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第28届中国控制与决策会议

作者： Wei Wu Steven Liu Bao Tong Cui Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan University Institute of Control Systems Department of Electrical and Computer EngineeringUniversity of Kaiserslautern

ISBN: (纸本)9781467397155

In this paper an improved method is proposed to convert multi-variable dependent time-varying systems into a polytopic representation with uncertain parameters for further stability *** on the Taylor expansion,the employed technique utilizes a specific arrangement of the cross-variable terms such that the obtained vertices of the polytopic system increases only polynomially with the order of the Taylor *** example about stability analysis demonstrates the effectiveness and usefulness of the proposed method in robust stability studies.

关键词： Time-varying systems polytopic representation robust stability

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Colored petri net based diagnosis of process systems 30

Colored petri net based diagnosis of process systems

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30th European Simulation and Modelling Conference, ESM 2016

作者： Pózna, Anna I. Gerzson, Miklós Leitold, Adrien Hangos, Katalin M. Department of Electrical Engineering and Information Systems Hungary Deparment of Mathematics University of Pannonia P.O.B. 158 VeszprémH-8201 Hungary Process Control Research Group Computer and Automation Research Institute P.O.B. 63 BudapestH-1518 Hungary

ISBN: (纸本)9789077381953

An improved diagnosis method of technological systems is proposed in this paper that is based on their qualitative colored Petri-net model (Leitold et al. 2014). The proposed diagnosis method can be used when more than one fault occur in the system and if the fault evolves during the operation of the system. In order to make the diagnosis of complex process systems computationally feasible, a structural decomposition method is introduced to reduce the size of their occurrence graphs and to make the diagnosis easier. The proposed methods are illustrated on examples.

关键词： Fault detection

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