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Multistability of Recurrent Neural Networks with Nonmonotonic Activation Functions and Mixed Time Delays

IEEE Transactions on Systems, Man, and Cybernetics: Systems 2016年第4期46卷 512-523页

作者： Liu, Peng Zeng, Zhigang Wang, Jun School of Automation Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan430074 China Department of Mechanical and Automation Engineering Chinese University of Hong Kong Hong Kong Department of Computer Science City University of Hong Kong Kowloon Tong Hong Kong

This paper presents new theoretical results on the multistability analysis of a class of recurrent neural networks with nonmonotonic activation functions and mixed time delays. Several sufficient conditions are derived for ascertaining the existence of 3n equilibrium points and the exponential stability of 2n equilibrium points via state space partition by using the geometrical properties of activation functions and algebraic properties of nonsingular M-matrix. Compared with existing results, the conditions herein are much more computable with one order less linear matrix inequalities. Furthermore, the attraction basins of these exponentially stable equilibrium points are estimated. It is revealed that the attraction basins of the 2n equilibrium points can be larger than their originally partitioned subspaces. Three numerical examples are elaborated with typical nonmonotonic activation functions to substantiate the efficacy and characteristics of the theoretical results. © 2015 IEEE.

关键词： Recurrent neural networks

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Online policy iterations for optimal control of input-saturated systems

Online policy iterations for optimal control of input-satura...

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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 2628CD The Netherlands Department of Engineering Science Control Group University of Oxford Parks Road OX1 3PJ U.K. Dept. of Electrical and Computer Engineering Democritus University of Thrace Xanthi 67100 Greece

ISBN: (纸本)9781467386838

This work proposes an online policy iteration procedure for the synthesis of sub-optimal control laws for uncertain Linear Time Invariant (LTI) Asymptotically Null-controllable with Bounded Inputs (ANCBI) systems. The proposed policy iteration method relies on: a policy evaluation step with a piecewise quadratic Lyapunov function in both the state and the deadzone functions of the input signals;a policy improvement step which guarantees at the same time close to optimality (exploitation) and persistence of excitation (exploration). The proposed approach guarantees convergence of the trajectory to a neighborhood around the origin. Besides, the trajectories can be made arbitrarily close to the optimal one provided that the rate at which the the value function and the control policy are updated is fast enough. The solution to the inequalities required to hold at each policy evaluation step can be efficiently implemented with semidefinite programming (SDP) solvers. A numerical example illustrates the results.

关键词： Optimal control Linear systems Convergence Asymptotic stability Lyapunov methods Estimation Trajectory trajectory Optimal control Lyapunov methods asymptotic stability region Linear system Converge iterative methods control strategy Policies

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The expressive power of the temporal query language LH

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2015年第3期77卷 85-92页

作者： Popovici, Matei Negreanu, Lorina Department of Computer Science Faculty of Automatic Control and Computers University Politehnica of Bucharest Romania Romania

The paper investigates the expressive power of the temporal query language LH. We show that First-Order Logic is unable to formulate queries such as temporal connectivity, which can be naturally expressed by LH. The paper describes in detail our application of the Ehrenfeucht-Fräýsse method, which is used to examine limitations in the expressive power of First-Order Logic.

关键词： Query languages

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Experimental measurement-device-independent quantum key distribution with imperfect sources

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Physical Review A 2016年第4期93卷 042308-042308页

作者： Zhiyuan Tang Kejin Wei Olinka Bedroya Li Qian Hoi-Kwong Lo Centre for Quantum Information and Quantum Control Department of Physics & Department of Electrical and Computer Engineering 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 People's Republic of China

Measurement-device-independent quantum key distribution (MDI-QKD), which is immune to all detector side-channel attacks, is the most promising solution to the security issues in practical quantum key distribution systems. Although several experimental demonstrations of MDI-QKD have been reported, they all make one crucial but not yet verified assumption, that is, there are no flaws in state preparation. Such an assumption is unrealistic and security loopholes remain in the source. Here we present a MDI-QKD experiment with the modulation error taken into consideration. By applying the loss-tolerant security proof by Tamaki et al. [Phys. Rev. A 90, 052314 (2014)], we distribute secure keys over fiber links up to 40 km with imperfect sources, which would not have been possible under previous security proofs. By simultaneously closing loopholes at the detectors and a critical loophole—modulation error in the source, our work shows the feasibility of secure QKD with practical imperfect devices.

关键词： Quantum cryptography

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Complex system optimization for economic emission load dispatch

Complex system optimization for economic emission load dispa...

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UKACC International Conference on control (control)

作者： Haiping Ma Zhile Yang Pengcheng You Minrui Fei Department of Electrical Engineering Shaoxing University Shaoxing China Department of Control Zhejiang University Hangzhou China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast Belfast UK Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai China

This paper proposes a complex system optimization method to solve economic emission load dispatch. First, a real-world economic emission load dispatch is modeled as a complex system problem, and the optimization objectives include economic load dispatch, emission load dispatch and transmission network loss. Then a called BBO/complex method is introduced, which extends biogeography-based optimization to a multi-archipelago environment to suit the structure of complex systems. Finally, the proposed method is applied to the economic emission load dispatch, and the results show that it can obtain good performance for economic emission load dispatch studied in this paper, and it is a competitive algorithm for solving complex system optimization problem.

关键词： Complex systems Propagation losses Economics Power systems Optimization methods Linear programming

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Start-up analysis methods for the diagnosis of rotor asymmetries in induction motors-seeing is believing

Start-up analysis methods for the diagnosis of rotor asymmet...

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Mediterranean Conference on control and Automation (MED)

作者： George Georgoulas Vicente Climente-Alarcon Leonidas Dritsas Jose A. Antonino-Daviu George Nikolakopoulos Control Engineering Group Department of Computer Science Electrical and Space Engineering Luleå University of Technology Luleå Sweden Department of Electrical Engineering and Automation Aalto University Aalto Finland Department of Electrical and Electronic Engineering Educators School of Pedagogical and Technological Education Athens Greece Instituto Tecnologico de la Energia Universitat Politècnica de València Valencia Spain

This article presents a qualitative analysis of different methods proposed for the diagnosis of broken rotor bars using the stator current during start-up operation. The slip dependent components, caused by the asymmetry, which is created by the breakage of rotor bar(s) and especially the left sideband harmonic (LSH) component, can create a distinctive pattern in a time-frequency plane. Short Time Fourier Transform, Wavelet analysis, and Wigner-Ville Distribution are evaluated using signals from motors operating in real industrial settings. The corresponding analysis presents the pros and the cons of these approaches for their potential application under realistic industrial conditions using the larger number of real life cases encountered in the literature.

关键词： Time-frequency analysis Rotors Induction motors Continuous wavelet transforms Spectrogram Interference

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An end to end web service composition based on QoS preferences

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical engineering and computer science 2015年第3 3期77 77卷 3-16页

作者： Iordache, Raluca Moldoveanu, Florica Automatic Control and Computers Doctoral School University POLITEHNICA of Bucharest Romania Dept. of Computer Science and Engineering Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania

The service-oriented environment offers the opportunity to create new applications, by combining existing applications offered as services, in order to react to the business' increasing pressure of quickly delivering new applications. With a large number of web services offering the same functionality, choosing the web services that meet best the client's quality of service (QoS) requirements is a very important task. We introduce a QoS-aware end to end web service composition approach that handles all the stages from the web service discovery step, to the actual binding of the services. This approach uses our method of expressing nonfunctional preferences, which requires minimal effort on the part of the clients, but offers great flexibility in managing trade-offs. We define a QoS preferences ontology and use it in our semantic web service selection to choose an initial candidate list of services for every task in the orchestration model. Then, one concrete service is chosen from each candidate list and is boand to the corresponding task. This step involves computing and comparing the aggregated QoS of the resulting composite services. The selection is performed using a genetic algorithm.

关键词： Quality of service

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Robust Image Retrieval Based on Mixture Modeling of Weighted Spatio-color Information

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6th International Image Processing and Communications Conference, IPandC 2014

作者： Luszczkiewicz-Piatek, Maria Smolka, Bogdan Department of Applied Computer Science University of Lodz Banacha 22 90-238 Lodz Poland Department of Automatic Control Silesian University of Technology Akademicka 16 Str. 44-100 Gliwice Poland

ISBN: (纸本)9783319106618

In this paper we propose a novel approach to color image retrieval. Color information is modeled using Gaussian mixtures and incorporates the information on the spatial distribution of the color image pixels utilizing the Dijkstra algorithm. The proposed algorithm has high indexing performance and operates on model of low dimensionality. Thus, the proposed method needs only the adjustment of Gaussian Mixture Model parameters for efficient color image retrieval. The proposed method is extensively tested on Corel and Wang dataset. The results demonstrate that proposed framework is more efficient than other methods when images are subjected to lossy coding such as JPEG method. © Springer International Publishing Switzerland 2015.

关键词： Image retrieval

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Sensor parametrisation and blending: a group theoretic approach

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IFAC-PapersOnLine 2015年第21期48卷 913-918页

作者： Szabó, Z. Balas, G. Gaspar, P. Bokor, J. Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Kende u. 13-17 [Tel: +36-1-279-6171 Hungary Department of Aerospace Engineering and Mechanics University of Minnesota 107 Akerman Hall 110 Union St SE Minneapolis MN 55455 United States Institute for Computer Science and Control Hungarian Academy of Sciences MTA-BME Control Engineering Research Group Hungary

Sensors play an important role in the control loop. Often they are considered to be a part of the plant and the interaction between the plant and sensor is disregarded. In this paper we investigate stability properties of the control loop when this interface is considered explicitly from an input/output perspective. Making the assumption that the sensor is stable, we provide a Youla type characterisation of all the sensors that renders the loop stable for a fixed plant and controller. When none of the sensors can provide the necessary performance it is time for sensor blending or a sensor reconfiguration. The simplest form of sensor fusion, i.e., a linear combination of the sensors, does not preserve stability of the control loop, in general. In order to design efficient algorithms that operate on the set of controllers or a set of sensors that fulfil a given property, e.g., stability or a norm bound, it is important to have an operation that preserves that property, i.e., a suitable blending method. This paper places the sensor blending problem in a more general context: an operation on stable sensors is given under which feedback stability is preserved and under which sensors form a group, the sensor group. Under the action of this group operation changes in different sensitivities can be also expressed in explicit terms. These results can be applied in the analysis and synthesis of schemes with sensor reconfiguration. © 2015

关键词： Blending

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Exponential stability assignment of inverse LQ regulator for neutral systems with time-varying delay

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2016年第10期136卷 1466-1472页

作者： Matsuki, Tsuyoshi Kubo, Tomohiro Oya, Hidetoshi Department of Electronics and Control Engineering National Institute of Technology Niihama College 7-1 Yagumo-cho Niihama Ehime792-8580 Japan Institute of Science and Technology Tokushima University 2-1 Minamijosanjima-cho Tokushima Tokushima770-8506 Japan Department of Computer Science Faculty of Knowledge Engineering Tokyo City University 1-28-1 Tamazutsumi Setagaya-ku Tokyo158-0087 Japan

In this paper, we propose a design method of an inverse LQ regulator for neutral systems with a time-varying delay, in which the resulting system is assured to have a pre-assigned degree of exponential stability. Using this method, the closed-loop system is asymptotically stabilized and a feedback law constructed easily is the optimal control minimizing a class of a cost functional without relation to the exponential stability assignment. In addition, the regulator promises to have a good robust stability as same as ordinary finite dimensional LQ regulators, even when a static nonlinear or a dynamic linear perturbation is inserted in the control input. Finally, the method is demonstrated by numerical examples with and without the exponential stability assignment. In the simulation, it is shown that the proposed method allows designers to seek more fast closed-loop responses by selecting two scalar parameters and the degree of exponential stability in a condition given by LMIs. © 2016 The Institute of Electrical Engineers of Japan.

关键词： Closed loop systems

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