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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Aldana, Carlos I. Nuño, Emmanuel Basañez, Luis Institute of Industrial and Control Engineering Technical University of Catalonia Barcelona08028 Spain Department of Computer Science CUCEI University of Guadalajara Guadalajara44430 Mexico

ISBN: (纸本)9783902823625

This paper proposes a distributed proportional plus damping (P+d) control algorithm to solve the leader-follower problem in which a network of heterogeneous robots, modeled in the operational space, has to be regulated at a given constant leader pose (position and orientation). The leader pose is only available to a certain set of followers. A singularity-free representation, unit-quaternions, is used to describe the robots orientation and the network is represented by an undirected and connected interconnection graph. Furthermore, it is shown that the controller is robust to interconnection variable time-delays. Experiments, with a network of two 6-Degrees-of-Freedom (DoF) robots, are presented to illustrate the performance of the proposed scheme. © IFAC.

关键词： Time delay

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Fault tolerant shape control for output PDFs tracking of stochastic distribution systems

Fault tolerant shape control for output PDFs tracking of sto...

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2014 American control Conference, ACC 2014

作者： Li, Tao Li, Gang Zhao, Qing School of Information and Control Nanjing University of Information Science and Technology Nanjing Jiangsu 210044 China Department of Electrical and Computer Engineering University of Alberta Canada

ISBN: (纸本)9781479932726

This paper investigates the fault-tolerant shape control (FTSC) problem for stochastic distribution systems. The available information for the addressed problem is the input and the measurable output Probability Density Function (PDF) of the system. The system is subject to actuator faults. In this case, the main objective is to achieve fault-tolerant shape control so that the output PDF can track a given target PDF shape even in the presence of faults. In this framework, an effective novel FTSC strategy is proposed based on the online estimation of the actuator faults, which includes a normal control law and an adaptive compensation control law simultaneously. The former can track the given output PDF with optimized performance index in the fault-free case, while the latter can automatically reduce (or even eliminate) the impact of faults for the given PDF shape. Finally, the effectiveness of the proposed design method is illustrated via a numerical example. © 2014 American automatic control Council.

关键词： Stochastic systems

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Experimental quantum key distribution with source flaws

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Physical Review A 2015年第3期92卷 032305-032305页

作者： Feihu Xu Kejin Wei Shihan Sajeed Sarah Kaiser Shihai Sun Zhiyuan Tang Li Qian Vadim Makarov Hoi-Kwong Lo Centre for Quantum Information and Quantum Control (CQIQC) Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada School of Science and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Institute for Quantum Computing (IQC) University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada College of Science National University of Defense Technology Changsha 410073 China

Decoy-state quantum key distribution (QKD) is a standard technique in current quantum cryptographic implementations. Unfortunately, existing experiments have two important drawbacks: the state preparation is assumed to be perfect without errors and the employed security proofs do not fully consider the finite-key effects for general attacks. These two drawbacks mean that existing experiments are not guaranteed to be proven to be secure in practice. Here, we perform an experiment that shows secure QKD with imperfect state preparations over long distances and achieves rigorous finite-key security bounds for decoy-state QKD against coherent attacks in the universally composable framework. We quantify the source flaws experimentally and demonstrate a QKD implementation that is tolerant to channel loss despite the source flaws. Our implementation considers more real-world problems than most previous experiments, and our theory can be applied to general discrete-variable QKD systems. These features constitute a step towards secure QKD with imperfect devices.

关键词： Quantum states Quantum theory Quantum entanglement Quantum cryptography Quantum computing

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Low Complexity Constraint control Using Contractive Sets

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IFAC Proceedings Volumes 2014年第3期47卷 2933-2938页

作者： Morten Hovd Sorin Olaru George Bitsoris Engineering Cybernetics Department Norwegian University of Science and Technology N-7491 Trondheim Norway SUPELEC Systems Science Automatic Control Department and EPIINRIA DISCO 3 rue Joliot Curie 91192 France Control Systems Laboratiry Department of Electrical and Computer Engineering University of Patras 26500 Patras Greece

This paper proposes a simple, non-iterative way of calculating low-complexity controlled contractive sets, and shows how such set can be used for controller design for systems with state and input constraints. The result is a low complexity controller, suitable for implementation in embedded control systems with modest computational power and available memory.

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Assessing the security risks of a wireless sensor network from a gas compressor station

Assessing the security risks of a wireless sensor network fr...

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

作者： Emil Pricop Sanda Florentina Mihalache Automatic Control Computer and Electronic Engineering Department Petroleum-Gas University of Ploiesti Ploiesti Romania

Usage of wireless sensor networks in various applications such as home automation, intelligent cars and infrastructures, military environment and critical factory monitoring and control is constantly increasing. WSN security is a real challenge for researchers and industry specialists since WSN are now used even in critical environments. In this paper the authors will assess the security risks of a WSN from an existing gas compressor station.

关键词： Wireless sensor networks Security Availability Transducers Wireless communication Manifolds Communication system security

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ONSIDE: Socially-aware and Interest-based dissemination in opportunistic networks

ONSIDE: Socially-aware and Interest-based dissemination in o...

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IEEE Symposium on Network Operations and Management

作者： Radu-Ioan Ciobanu Radu-Corneliu Marin Ciprian Dobre Valentin Cristea Constandinos X. Mavromoustakis Computer Science Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania Department of Computer Science University of Nicosia Nicosia Cyprus

ISBN: (纸本)9781479909117

Data dissemination in opportunistic networks poses a series of challenges, since there is no central entity aware of all the nodes' subscriptions. Each individual node is only aware of its own interests and those of a node that it is contact with, if any. Thus, dissemination is generally performed using epidemic algorithms that flood the network, but they have the disadvantage that the network overhead and congestion are very high. In this paper, we propose ONSIDE, an algorithm that leverages a node's online social connections (i.e. friends on social networks such as Facebook or Google+), its interests and the history of contacts, in order to decrease congestion and required bandwidth, while not affecting the overall network's hit rate and the delivery latency. We present the results of testing our algorithm using an opportunistic network emulator and three mobility traces taken in different environments.

关键词： Social network services Algorithm design and analysis Measurement History Routing Bandwidth Mobile handsets

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An Adaptive controller for Bilateral Teleoperators: Variable Time-Delays Case

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IFAC Proceedings Volumes 2014年第3期47卷 9341-9346页

作者： Emmanuel Nuño Ioannis Sarras Luis Basañez Department of Computer Science. CUCEI University of Guadalajara. Guadalajara Mexico Automatic Control Department SUPELEC. Gif-sur-Yvette France Institute of Industrial and Control Engineering Technical University of Catalonia. Barcelona Spain

It is well known that in most bilateral teleoperation systems, variable time-delays arise in the communications. Motivated by this fact, the present work reports the extension to the (asymmetric) variable time-delays case of the adaptive controller for bilateral teleoperators with uncertain parameters and constant time-delays, reported in Nuño et al (2010) [Nuño, E., Ortega, R. and Basañez, L. (2010). An adaptive controller for nonlinear teleoperators. automatica, 46(1), 155–159]. Compared to the previous work, the stability analysis does not rely on the cascade interconnection structure of the local and remote nonlinear dynamics and the linear interconnection map. Instead, the paper employs a different Lyapunov candidate function that incorporates a strictly positive term, the local and remote position error. With the only assumption that a bound of the time-delays is known, the paper also presents a sufficient condition that ensures the asymptotic convergence of position errors and velocities to zero. Some simulations, in free space and interacting with a stiff wall, illustrate the performance of the proposed control scheme in the presence of variable time–delays.

关键词： Bilateral teleoperation adaptive control time-delays

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Piecewise Polynomial Policy Iterations for Synthesis of Optimal control Laws in Input-Saturated Systems

Piecewise Polynomial Policy Iterations for Synthesis of Opti...

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American control Conference

作者： Simone Baldi Giorgio Valmorbida Antonis Papachristodoulou Elias B. Kosmatopoulos Delft Center for Systems and Control Delft University of Technology Delft 2628CD The Netherlands Department of Engineering Science Control Group University of Oxford Parks Road Oxford OX1 3PJ U.K. Dept. of Electrical and Computer Engineering Democritus University of Thrace Xanthi 67100 Greece and Informatics & Telematics Institute Center for Research and Technology Hellas (ITI-CERTH) Thessaloniki 57001 Greece

ISBN: (纸本)9781479917730

This work proposes a policy iteration procedure for the synthesis of optimal and globally stabilizing control policies for Linear Time Invariant (LTI) Asymptotically Null-controllable with Bounded Inputs (ANCBI) systems. This class includes systems with eigenvalues on the imaginary axis (possibly repeated) but no pole with positive real part. The proposed policy iteration relies on a class of piecewise quadratic Lyapunov functions which is non-differentiable, but continuous, and polynomial in both the state and the deadzone functions of the input signals. The second step of the policy iteration is based on a piecewise control policy improvement. An important aspect of the proposed piecewise policy is that at each step of the iteration the computed policy is globally stabilizing and the existence of an improving value function is guaranteed as well. The solution to the inequalities which is required to hold at each step of the policy iteration, is obtained by solving Sum-of-Squares Programs (SOSP) that can be efficiently implemented with semidefinite programming (SDP) solvers.

关键词： iterative methods Policies Piecewise control law synthesis Polynomial control strategy Liapunov function Bounded

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Inverse parametric convex programming problems via convex liftings

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IFAC Proceedings Volumes 2014年第3期47卷 2489-2494页

作者： N.A. Nguyen S. Olaru P. Rodriguez-Ayerbe M. Hovd I. Necoara E3S (Supélec Systems Sciences Automatic Control Department Gif-sur-Yvette France Department of Engineering Cybernetics Norwegian University of Science and Technologies Trondheim Norway Politehnica University of Bucharest Automatic Control and Systems Engineering Department Bucharest Romania

The present paper introduces a procedure to recover an inverse parametric linear or quadratic programming problem from a given polyhedral partition over which a continuous piecewise affine function is defined. The solution to the resulting parametric linear problem is exactly the initial piecewise affine function over the given original parameter space partition. We provide sufficient conditions for the existence of solutions for such inverse problems. Furthermore, the constructive procedure proposed here requires at most one supplementary variable in the vector of optimization arguments. The principle of this method builds upon an inverse map to the orthogonal projection, known as a convex lifting. Finally, we show that the theoretical results has a practical interest in Model Predictive control (MPC) design. It is shown that any linear Model Predictive controller can be obtained through a reformulated MPC problem with control horizon equal to two prediction steps.

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Effect of source tampering in the security of quantum cryptography

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Physical Review A 2015年第2期92卷 022304-022304页

作者： Shi-Hai Sun Feihu Xu Mu-Sheng Jiang Xiang-Chun Ma Hoi-Kwong Lo Lin-Mei Liang College of Science National University of Defense Technology Changsha 410073 China Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA State Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 China

The security of source has become an increasingly important issue in quantum cryptography. Based on the framework of measurement-device-independent quantum key distribution (MDI-QKD), the source becomes the only region exploitable by a potential eavesdropper (Eve). Phase randomization is a cornerstone assumption in most discrete-variable (DV) quantum communication protocols (e.g., QKD, quantum coin tossing, weak-coherent-state blind quantum computing, and so on), and the violation of such an assumption is thus fatal to the security of those protocols. In this paper, we show a simple quantum hacking strategy, with commercial and homemade pulsed lasers, by Eve that allows her to actively tamper with the source and violate such an assumption, without leaving a trace afterwards. Furthermore, our attack may also be valid for continuous-variable (CV) QKD, which is another main class of QKD protocol, since, excepting the phase random assumption, other parameters (e.g., intensity) could also be changed, which directly determine the security of CV-QKD.

关键词： QUANTUM cryptography QUANTUM communication QUANTUM coherence RANDOMIZATION (Statistics) QUANTUM computing

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