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Satellite-Relayed Intercontinental Quantum Network

Physical Review Letters 2018年第3期120卷 030501-030501页

作者： Sheng-Kai Liao Wen-Qi Cai Johannes Handsteiner Bo Liu Juan Yin Liang Zhang Dominik Rauch Matthias Fink Ji-Gang Ren Wei-Yue Liu Yang Li Qi Shen Yuan Cao Feng-Zhi Li Jian-Feng Wang Yong-Mei Huang Lei Deng Tao Xi Lu Ma Tai Hu Li Li Nai-Le Liu Franz Koidl Peiyuan Wang Yu-Ao Chen Xiang-Bin Wang Michael Steindorfer Georg Kirchner Chao-Yang Lu Rong Shu Rupert Ursin Thomas Scheidl Cheng-Zhi Peng Jian-Yu Wang Anton Zeilinger Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China Chinese Academy of Sciences (CAS) Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Vienna Center for Quantum Science and Technology Faculty of Physics University of Vienna Vienna 1090 Austria Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences Vienna 1090 Austria School of Computer National University of Defense Technology Changsha 410073 China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Key Laboratory of Optical Engineering Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 China Shanghai Engineering Center for Microsatellites Shanghai 201203 China State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control Center Xi’an 710061 China Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi 830011 China National Space Science Center Chinese Academy of Sciences Beijing 100080 China Space Research Institute Austrian Academy of Sciences Graz 8042 Austria

We perform decoy-state quantum key distribution between a low-Earth-orbit satellite and multiple ground stations located in Xinglong, Nanshan, and Graz, which establish satellite-to-ground secure keys with ∼kHz rate per passage of the satellite Micius over a ground station. The satellite thus establishes a secure key between itself and, say, Xinglong, and another key between itself and, say, Graz. Then, upon request from the ground command, Micius acts as a trusted relay. It performs bitwise exclusive or operations between the two keys and relays the result to one of the ground stations. That way, a secret key is created between China and Europe at locations separated by 7600 km on Earth. These keys are then used for intercontinental quantum-secured communication. This was, on the one hand, the transmission of images in a one-time pad configuration from China to Austria as well as from Austria to China. Also, a video conference was performed between the Austrian Academy of sciences and the Chinese Academy of sciences, which also included a 280 km optical ground connection between Xinglong and Beijing. Our work clearly confirms the Micius satellite as a robust platform for quantum key distribution with different ground stations on Earth, and points towards an efficient solution for an ultralong-distance global quantum network.

关键词： Quantum channels Quantum communication Quantum cryptography Quantum networks Quantum optics

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Optimal distributed control for platooning via sparse coprime factorizations

Optimal distributed control for platooning via sparse coprim...

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2016 American control Conference, ACC 2016

作者： SabǍu, Şerban OarǍ, Cristian Warnick, Sean Jadbabaie, Ali Electrical and Computer Engineering Dept. Stevens Institute of Technology HobokenNJ United States Automatic Control Dept. University Politehnica Bucharest Romania Information and Decision Algorithms Laboratories Faculty of the Computer Science Department Brigham Young University United States Electrical and Systems Engineering Dept. University of Pennsylvania United States

ISBN: (纸本)9781467386821

We introduce a novel distributed control architecture for disturbances attenuation in heterogeneous platoons of linear and time-invariant autonomous agents that inherits the performance achievable by the leader-follower control policies. We provide a Youla-like parameterization for the class of all distributed controllers such that the sparsity constraints are imposed on the controllers' left coprime factors, outlining a new concept of structural constraints in distributed control. The proposed scheme lends itself to optimal controller design via norm based costs, it guarantees string stability and completely eliminates the accordion effect from the behavior of the platoon. The distributed controller is proven to attain global optimality for heterogeneous platoons and H2 costs and can easily reconfigure such as to remain optimal during formation merging/exiting maneuvers. The scheme is amenable to a GPS time base synchronization mechanism, allowing for the exact compensation of the time delays induced by the wireless communications. © 2016 American automatic control Council (AACC).

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Generalized Norm Optimal Iterative Learning control with Intermediate Point and Sub-interval Tracking

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International Journal of Automation and computing 2015年第3期12卷 243-253页

作者： David H.Owens Chris T.Freeman Bing Chu Department of Automatic Control and Systems Engineering University of Sheffield School of Electronics and Computer Science University of Southampton Advanced Robotics Division Italian Institute of Technology

Norm optimal iterative learning control(NOILC) has recently been applied to iterative learning control(ILC) problems in which tracking is only required at a subset of isolated time points along the trial duration. This problem addresses the practical needs of many applications, including industrial automation, crane control, satellite positioning and motion control within a medical stroke rehabilitation context. This paper provides a substantial generalization of this framework by providing a solution to the problem of convergence at intermediate points with simultaneous tracking of subsets of outputs to reference trajectories on subintervals. This formulation enables the NOILC paradigm to tackle tasks which mix "point to point" movements with linear tracking requirements and hence substantially broadens the application domain to include automation tasks which include welding or cutting movements, or human motion control where the movement is restricted by the task to straight line and/or planar segments. A solution to the problem is presented in the framework of NOILC and inherits NOILC s well-defined convergence properties. Design guidelines and supporting experimental results are included.

关键词： Iterative learning control learning control optimization linear systems robotics.

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Type of Material in the Pipes Overhead Power Lines Impact on the Distribution on the Size of the Overhang and the Tension

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IOP Conference Series: Materials science and Engineering 2017年第2期245卷

作者： Urszula Pawlak Marcin Pawlak Department of Mechanics Metal Structures and Computer Methods Faculty of Civil and Environmental Engineering Kielce University of Technology Kielce Poland Department of Power Engineering Electronics Faculty of Electrical Engineering Automatic Control and Computer Kielce University of Technology Kielce Poland

The article presents the material type from which the conductors of the overhead power lines are produced influences on the size of the overhang and the tension. The aim of the calculations was to present the benefits of the mechanics of the cable resulting from the type of cable used. The analysis was performed for two types of cables: aluminium with steel core and aluminium with composite core, twice span power line section. 10 different conductor-to-strand coil, wind, icing, and temperature variations were included in the calculations. The string description was made by means of a chain curve, while the horizontal component H of the tension force was determined using the bisection method. The loads were collected in accordance with applicable Eurocode.

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Simultaneous Extraction of the Moon and Stars at Night

Simultaneous Extraction of the Moon and Stars at Night

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2016 IEEE Chinese Guidance, Navigation and control Conference (IEEE CGNCC2016)

作者： Huajun Du Huosheng Hu Yunfeng Ai Beijing Aerospace Automatic Control Institute National Key Laboratory of Science and Technology on Aerospace Intelligence Control School of Computer and Electronics Engineering University of Essex School of Engineering Science University of Chinese Academy of Sciences

ISBN: (纸本)9781467383196

It is well known that star sensor is an accurate attitude sensor in various real applications,which however has not been fully used to observe stars and the moon *** paper investigates how the moon and stars can be observed by the star sensor,and how to process the images taken under different light conditions to extract information to determine attitude and location of the *** are conducted to show that the star sensor can be efficiently applied as an integrated celestial sensor,providing economical,reliable and autonomous benefits to the missions conducted on the earth,in the air,on other planets and so on.

关键词： star sensor the moon and stars image processing

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Design of a controller for stabilization of spherical robot's sideway oscillations

Design of a controller for stabilization of spherical robot'...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Kacper Landa Adam Krzysztof Pilat Master's student at Automatic Control and Robotics AGH University of Science and Technology Cracow Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Cracow Poland

In this study, the dynamics and control aspects of a spherical rolling robot's lateral motion are investigated. An approximate, simplified to a single plane, mathematical model is derived using Lagrange equations to check stability of the system. Utilizing the fusion of sensor data, a precise orientation measurement is achieved. Document focuses on a synthesis of a PID controller reducing sideway oscillations that occur in motion of a spherical robot with internal pendulum mechanism.

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MTS2: Many task scheduling simulator 29

MTS2: Many task scheduling simulator

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Stratulat, Adrian Oncioiu, Raluca Pop, Florin Dobre, Ciprian Computer Science Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Romania

ISBN: (纸本)9780993244001

The Many Task Computing paradigm was first introduced by loan Raicu and could be described shortly as solving a large number of tasks with short time executions (i.e. seconds to minutes long) that are data intensive. We propose MTS2: Many Task Scheduling Simulator that can be used for a broad range of simulations-after each simulation one can visualize the results. The purpose of MTS2 framework is to simulate events that happen inside a cluster in order to experimentally check or validate various classes of scheduling algorithms. Our event-based simulator provides the building blocks that can be used to implement mathematical models for simulations and it is designed to be extensible, fast and scalable. For the purpose of scheduling algorithm evaluation, the performance is critical: we will study the asymptotic behaviour of some scheduling algorithms under extreme conditions. We will show that MTS2 can be used in various scheduling algorithms and performs better than SimMatrix on a quad core machine, regarding the time per task: 7 microseconds compared to 100 microseconds for simulations with one node and less than 0.5 microseconds with MTS2 for simulations with more than 64 nodes. © ECMS Valen M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Scheduling algorithms

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Considerations regarding security issues impact on systems availability

Considerations regarding security issues impact on systems a...

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International Conference on electronics, computers and Artificial Intelligence (ECAI)

作者： Emil Pricop Sanda Florentina Mihalache Nicolae Paraschiv Jaouhar Fattahi Florin Zamfir Automatic Control Computers & Electronics Department Petroleum-Gas University of Ploiesti Ploiesti Romania Dept. of Computer Science & Software Engineering Université Laval Québec Canada

control systems behavior can be analyzed taking into account a large number of parameters: performances, reliability, availability, security. Each control system presents various security vulnerabilities that affect in lower or higher measure its functioning. In this paper the authors present a method to assess the impact of security issues on the systems availability. A fuzzy model for estimating the availability of the system based on the security level and achieved availability coefficient (depending on MTBF and MTR) is developed and described. The results of the fuzzy inference system (FIS) are presented in the last section of the paper.

关键词： Security Reliability control systems Wireless sensor networks Fuzzy logic Safety Network topology

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Testing designing an electrical device compliant with the electromagnetic compatibility directive

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IOP Conference Series: Materials science and Engineering 2017年第1期227卷

作者： M Płaczek M Maćkowski P Nowak Silesian University of Technology Faculty of Mechanical Engineering Institute of Engineering Processes Automation and Integrated Manufacturing Systems Konarskiego 18A 44-100 Gliwice Poland Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Institute of Informatics Akademicka 16 44-100 Gliwice Poland

The goal of presented work was to build an electronic device in order to test the effectiveness of different EMC-improving solutions. Three EMC tests were done in order to check the created device compliance with the electromagnetic compatibility directive. Each of them was conducted for both industrial and non-industrial parameters (voltage and field strength), according to IEC PN-EN 61000 standards. Three tests were done: conductive immunity test in EM clamp, radiated immunity test in GTEM chamber, radiated emission test in GTEM chamber. Firstly, the device's conductive immunity was examined. The set of possible solutions was created by examining existing designs, papers, books and producers' recommendations. In result, different component configurations were chosen to determine the most EMC-effective one. Next, electromagnetic compatibility of proposed device configurations was tested in the GTEM chamber (radiated immunity and radiated emission). Tests results are presented on charts and analysed in order to verify if designed device face requirements of the electromagnetic compatibility directive. It was verify which of proposed electromagnetic compatibility improving solutions can solve problems with electromagnetic compatibility.

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MaaS advanced provisioning and reservation system 1

MaaS advanced provisioning and reservation system

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1st International Workshop on Automated Incident Management in Cloud, AIMC 2015

作者： Sirbu, Alexandru Pop, Cristian Pop, Florin University Politehnica of Bucharest Romania Faculty of Automatic Control and Computers Computer Science Department Romania

ISBN: (纸本)9781450334761

The ongoing adoption of Cloud Computing at a fast rate has lead to an increase in the number of users and in the same time, in the level of complexity and performance. The interaction model is based on services offered to users at different levels. Metal-as-a-service (MaaS) platforms assure a higher level of performance when compared to typical Cloud platforms, but at the cost of a more complex provisioning system. An advanced reservation and provisioning system for MaaS should alleviate the problem of added complexity by accounting for the observed deployment time of the infrastructures. The paper studies the provisioning capabilities of the Bigstep Full Metal Cloud platform in order to allow the construction of such a system. The main issue addressed is oriented on cloud management automation, SLA and QoS management. Copyright © 2015 ACM.

关键词： Metals

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