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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Constantin F. Caruntu Cosmin Copot Corneliu Lazar Robin De Keyser Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Department of Electrical energy Systems and Automation Ghent University Ghent Belgium

The increased traffic flow on both existing highways and city roads leads to the appearance of stop-and-go waves which have many disadvantages, e.g., increased risk of accidents, higher fuel consumption, increased pollution, increased wear of vehicle mechanical parts, driving stress and passenger discomfort. The platooning of vehicles could be the solution to this problem by enforcing them to follow each other and to maintain a safe distance between them. The advantages brought by this solution depend on ensuring the string stability of the vehicle platoon. In this paper the leader-follower system is employed to illustrate the stop-and-go waves mitigation. Several controllers (P, PI) were designed based on the conditions that have to be met in order to ensure the string stability of the vehicle platoon and comparisons were made with a controller based on the driver behavior.

关键词： Vehicles Mobile robots Accidents Stability criteria Transfer functions

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Do Not Cancel My Race with Cyber-Physical systems

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IFAC Proceedings Volumes 2014年第3期47卷 4346-4351页

作者： Constantin B. Zamfirescu Bogdan-Constantin Pirvu Matthias Loskyll Detlef Zuehlke German Research Center for Artificial Intelligence (DFKI) Innovative Factory Systems Trippstadter Strasse 122 Kaiserslautern Germany Lucian Blaga University of Sibiu Faculty of Engineering Department of Computer Science and Automatic Control Emil Cioran 17 Sibiu Romania

To engineer the factory of the future the paper argues for a reference model that is not necessary restricted to the control component, but integrates the physical and human components as well. This is due to the real need to accommodate the latest achievements in factory automation where the human is not merely playing a simple and clear role inside the control-loop, but is becoming a composite factor in a highly automated system (“man in the mesh”). The concept is demonstrated by instantiating the anthropocentric cyber-physical reference architecture for smart factories (ACPA4SF) in a concrete case study that needs to accommodate the ongoing researches from the SmartFactory KL facility (e.g. augmented reality, mobile interaction technology, virtual training of human operators).

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Embedding of Nonlinear systems in a Linear Parameter-Varying Representation

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IFAC Proceedings Volumes 2014年第3期47卷 6907-6913页

作者： Hossam S. Abbas Roland Tóth Mihály Petreczky Nader Meskin Javad Mohammadpour Department of Electrical Engineering College of Engineering Qatar University PO Box 2713 Doha Qatar Electrical Engineering Department Faculty of Engineering Assiut University Assiut Egypt Control Systems Group Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Department of Computer Science and Automatic Control Ecole des Mines de Douai 59508 Douai France Intelligent Control Systems Lab College of Engineering The University of Georgia Athens GA 30602 USA

This paper introduces a systematic approach to synthesize linear parameter-varying (LPV) representations of nonlinear (NL) systems which are originally defined by control affine state-space representations. The conversion approach results in LPV state-space representations in the observable canonical form. Based on the relative degree concept of NL systems, the states of a given NL representation are transformed to new coordinates that provide its normal form. In the SISO case, all nonlinearities of the original system are embedded in one NL function which is factorized to construct the LPV form. An algorithms is proposed for this purpose. The resulting transformation yields an LPV model where the scheduling parameter depends on the derivatives of the inputs and outputs of the system. In addition, if the states of the NL model can be measured or estimated, then the procedure can be modified to provide LPV models scheduled by these states. Examples are included for illustration.

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26th Annual Computational Neuroscience Meeting (CNS*2017) of the Organization for Computational Neuroscience Antwerp, Belgium, July 15-20, 2017

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei

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Data hiding using steganography

Data hiding using steganography

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2013 IEEE 12th International Symposium on Parallel and Distributed Computing, ISPDC 2013

作者： DǍgǍdiţǍ, Monica Adriana Sluşanschi, Emil Ioan Dobre, RǍzvan University Politehnica of Bucharest Faculty of Automatic Control and Computers Computer Science and Engineering Department Romania

ISBN: (纸本)9780769550183

It is a truth universally acknowledged that 'a picture is worth a thousand words'. The emerge of digital media has taken this saying to a complete new level. By using steganography, one can hide not only 1000, but thousands of words even in an average sized image. This article presents various types of techniques used by modern digital steganography, as well as the implementation of the least significant bit (LSB) method. The main objective is to develop an application that uses LSB insertion in order to encode data into a cover image. Both a serial and parallel version are proposed and an analysis of the performances is made using images ranging from 1:9 to 131 megapixels. © 2013 IEEE.

关键词： Steganography

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Image vectorization on modern architectures

Image vectorization on modern architectures

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2013 IEEE 9th International Conference on Intelligent Computer Communication and Processing, ICCP 2013

作者： Slusanschi, Emil Lupescu, Grigore Computer Science and Engineering Departament Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781479914937

This work presents an image vectorization application aimed to exploit features found in most of today's modern architectures. Design decisions supported by performance results are presented along with use cases for the proposed solution. We will present the algorithm, the target architectures and threading models, as well as a number of optimization techniques. Finally results of both low power SoC and high performance multicore processors are discussed. © 2013 IEEE.

关键词： System-on-chip

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Metaheuristic approach in nonlinear systems bidentification

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2013年第3期75卷 91-104页

作者： Cornoiu, Mihai Bâra, CǍtǍlin Popescu, Dumitru Automatic Control and Systems Engineering Department Automatic Control and Computers Faculty University POLITEHNICA of Bucharest Romania

In this paper is presented a Hammerstein systems identification algorithm. The algorithm uses Particle Swarm Optimization firstly to approximate the nonlinear component, also using sigmoid type functions, and, secondly, to estimate the linear component's parameters and the nonlinear functions connection coefficients, by solving a standard least squares problem. Due to the nature of Hammerstein systems, Particle Swarm Optimization was adapted with respect to specific constraints, which are detailed in this article. Numerical results confirm the accuracy of this proposed identification method.

关键词： Nonlinear systems

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Improving adaptive feedforward vibration compensation by using "integral+Proportional" adaptation

Improving adaptive feedforward vibration compensation by usi...

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作者： Airimiţoaie, Tudor-Bogdan Landau, Ioan Doré Control Systems Department GIPSA-lab CNRS St. Martin d'Héres 38402 France Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest 060042 Romania

Analysis of various adaptive feedforward vibration compensation schemes has shown that a strictly positive real (SPR) condition has to be satisfied in order to guarantee the stability of the whole system (Jacobson, Johnson, Cormick, & Sethares, 2001;Landau, Airimiţoaie, & Alma, 2011a;Landau, Alma, & Airimiţoaie, 2011b;Wang & Ren, 1999). Filters have to be implemented in order to satisfy this condition. The problem becomes even more crucial in the presence of the internal mechanical coupling between the compensator system and the reference source (a correlated measurement with the disturbance) since some information is not available when adaptation starts (see Landau et al., 2011b). It is therefore very important to relax the SPR condition at least in the initial phase, and in the same time to improve the adaptation transients. It is shown, in this paper, that adding a proportional adaptation to the standard integral type parametric adaptation, the SPR condition can be relaxed and the adaptation transients are improved. Theoretical developments are enhanced by real time experimental results obtained on an active vibration control (AVC) system. © 2013 Elsevier Ltd. All rights reserved.

关键词： Vibration analysis

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Decentralized modeling of road traffic

Decentralized modeling of road traffic

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2013 2nd International Conference on systems and Computer Science, ICSCS 2013

作者： Dimon, Catalin Dauphin-Tanguy, Genevieve University Politehnica of Bucharest Faculty of Automatic Control and Computers Department of Automatic Control and System Engineering Splaiul Independentei 313 060042 Bucharest Romania Ecole centrale de Lille Cité Scientifique CS 20048 59651 Villeneuve d'Ascq Cedex France

ISBN: (纸本)9781479920204

Road traffic is considered as a complex system organized in a decentralized structure composed of three levels. At the highest level of complexity we have a traffic region, considered as a part of a city's road infrastructure. At the next level, the region is decomposed into traffic objects represented by road sections and intersections. At the last level of complexity we have the road segments that are parts of a road section. The traffic is considered in a macroscopic representation and the modeling for the different components of the road region is achieved by employing techniques from fluid mechanics. The results are verified in simulation, based on traffic data. © 2013 IEEE.

关键词： Roads and streets

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A novel adaptive spiral dynamic algorithm for global optimization

A novel adaptive spiral dynamic algorithm for global optimiz...

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2013 13th UK Workshop on Computational Intelligence, UKCI 2013

作者： Nasir, A.N.K. Tokhi, M.O. Sayidmarie, O. Raja Ismail, R.M.T. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Faculty of Electrical and Electronics Engineering Universiti Malaysia Pahang Malaysia

ISBN: (纸本)9781479915682

This paper presents a novel adaptive spiral dynamic algorithm for global optimization. Through a spiral model, spiral dynamic algorithm has a balanced exploration and exploitation strategy. Defining suitable value for the radius and displacement in its spiral model may lead the algorithm to converge with high speed. The dynamic step size produced by the model also allows the algorithm to avoid oscillation around the optimum point. However, for high dimension problems, the algorithm may easily get trapped into local optima. This is due to the incorporation of a constant radius and displacement in the model. In order to solve the problem, a novel adaptive formulation is proposed in this paper by varying the radius and displacement of the spiral model. The proposed algorithm is validated with various dimensions of unimodal and multimodal benchmark functions. Furthermore, it is applied to parameter optimization of an autoregressive with exogenous terms dynamic model of a flexible manipulator system. Comparison with the original spiral dynamic algorithm shows that the proposed algorithm has better accuracy. Moreover, the time domain and frequency domain responses of the flexible manipulator model shows that the proposed algorithm outperforms its predecessor algorithm. © 2013 IEEE.

关键词： Dynamic models

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