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20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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Petri net approach for deadlock prevention in robot planning

Petri net approach for deadlock prevention in robot planning

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2013 IEEE 18th International Conference on Emerging Technologies and Factory Automation, ETFA 2013

作者： Kloetzer, Marius Mahulea, Cristian Colom, Jose-Manuel Dept. of Automatic Control and Applied Informatics Technical University Gh. Asachi of Iasi Romania Dept. of Computer Science and Systems Engineering Univ. of Zaragoza Spain

ISBN: (纸本)9781479908622

This paper provides a strategy for supervising the motion of some mobile robots that evolve in the same environment. Some regions of the environment are assumed to have a limited capacity in terms of the number of robots that can simultaneously occupy them, and a set of possible trajectories is available for each robot. The solution comprises the construction of a specific Petri net model for the available trajectories, and the use of resource-allocation techniques based on restricted-capacity regions and on deadlock-free execution. © 2013 IEEE.

关键词： Petri nets

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A simulation study of consensus speed over scale-free networks

A simulation study of consensus speed over scale-free networ...

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IFAC Workshop on Networked Robotics, NetRob09

作者： Sun, Wei Chen, Yang Quan Dept. of Automatic Control Beijing Institute of Technology Beijing 100081 China Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 United States

ISBN: (纸本)9783902661531

Scale-free network and consensus among multiple agents have both drawn quite much attention. To investigate the consensus speed over scale-free networks is the main topic in this paper. Given a set of different values for the power-law distribution parameter γ, and a set of different values for the minimum degree (dmin) for the nodes, the algebraic connectivity (γ2) of the network topology is studied, as well as the time (t c) (or iteration (kc), for discrete algorithm) taken to reach consensus. The results exhibit that γ2 decreases while increases. The γ2 increases monotonically as dmin grows, and they fit very well in a linear relationship. tc (or kc) decreases as reduces and dmin increases. Via observing the behavior of the largest eigenvalue (γn) of the Laplacian of the network topology, we draw the conclusion that the robustness over time delays declines while the robustness over node-failures and edge-failures increases. © 2009 IFAC.

关键词： Iterative methods

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H∞ control of linear parameter-dependent state-delayed systems

H∞ control of linear parameter-dependent state-delayed syst...

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2005 IEEE International Conference on control Applications, CCA

作者： Karimi, H.R. Moshiri, B. Jabehdar Maralani, P. Lohmann, B. Dept. of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran Institute of Automatic Control Technical University of Munich 85748 Munich Germany

ISBN: (纸本)0780393538

In this paper, we deal with the issue of robust delay-independent asymptotic stability and robust disturbance attenuation problem for linear parameter-dependent systems. Using Hamiltonian-Jacoby-Isaac approach, a parameter-dependent LMI optimization is obtained. It is shown that by utilizing polynomial parameter-dependent quadratic Lyapunov functions, a parameter-dependent LMI optimization problem is derived. Therefore, state feedback control is determined by solving a parameter-independent LMI. Finally, the applicability of the proposed design is illustrated on a simple example. © 2005 IEEE.

关键词： Linear systems

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Optimal deployment of distributed passive measurement monitors

Optimal deployment of distributed passive measurement monito...

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2006 IEEE International Conference on Communications, ICC 2006

作者： Chengchen, Hu Bin, Liu Zhen, Liu Shifang, Gao Dapeng, Wu Dept. of Computer Science and Technology Tsinghua University Beijing China Dept. of Automatic Control Northwest Polytechnical University Xi'an Shaanxi China Dept. of Electrical and Computer Engineering University of Florida Gainesville FL United States

ISBN: (纸本)1424403553

Flow-level traffic measurement is important for network management. The widely used centralized per-flow measurement faces a great challenge due to the demanding requirement on both memory bandwidth and memory size within a single traffic monitor. This paper addresses the issue of deploying a Distributed Passive Measurement System (DPMS) in a large scale network;specifically, we study how to optimally place traffic monitors and sample stochastic traffic flows, so that the probability of a packet being sampled (a.k.a. measurement coverage) is maximized. We formulate this problem as a Stochastic Chance Constrained Optimization (SCCO) problem;and we propose a Hybrid Intelligent (HI) algorithm to solve this problem. The HI algorithm consists of two major components, namely, uncertain function approximation and genetic algorithm. Equipped with the HI algorithm, we are able to address the optimal tradeoff between measurement coverage and deployment cost for networks with random traffic, which has not been studied before. Our simulations and experiments demonstrate the effectiveness of our algorithm, i.e., a small deployment cost or a small number of monitors are sufficient to maintain a high level of measurement coverage. © 2006 IEEE.

关键词： Telecommunication traffic

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Improved textured images segmentation using an energy functional 9th

Improved textured images segmentation using an energy functi...

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9th International Conference on Image Analysis and Processing, ICIAP 1997

作者： Grau, Antoni Saludes, Jordi Dept. of Automatic Control and Computer Engineering Polytechnic University of Catalonia UPC Barcelona Catalonia Spain Dept. of Applied Mathematics II Polytechnic University of Catalonia UPC Barcelona Catalonia Spain

ISBN: (纸本)3540635076

In this paper we present a new classification and image segmentation system based on the addition of a variational method to a classic clustering algorithm. This system constitutes an improvement respect traditional segmentation methods. Often due to the nature of the texture features obtained from an image, the segmentation results are not quite precise. If this happens, using the energy functional and its minimization can improve the segmentation. This functional takes into account the information in the feature space and the information in the 2D image domain. The extracted characteristics from the image are texture features that have been defined in order to obtain an admissible trade-off between their discriminant capacity and their effectiveness to be implemented in a vision board to operate at real time. We show some results to appreciate this improvement in the segmentation using the energy functional. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Clustering algorithms

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Modelling and verification of hybrid systems: A case study 4

Modelling and verification of hybrid systems: A case study

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4th Annual Conference on AI, Simulation, and Planning in High Autonomy Systems, AIS 1993

作者： Nadjm-Tehrani, S. Stromberg, J.-E. Dept. of Computer and Information Science Linkoping University LinkopingS-58183 Sweden Div. of Automatic Control Dept. of Electrical Engineering Linkoping University LinkopingS-58183 Sweden

ISBN: (纸本)0818640200

The problem of correctness and timing of reactions of an agent in interaction with a physical environment is addressed. To this end, a method based on composition of separate models of the software and the environment is used. To use available methods within the field of software verification, discrete representations of the continuous components are described systematically. A nontrivial case study within the domain of road traffic is used to illustrate the derivation of discrete models without losing information relevant to the verification task. The different modeling stages involved are shown first within an untimed formalism, and then in a formalism incorporating quantitative time. © 1993 IEEE.

关键词： Hybrid systems

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VLAN-PSSR: Port-switching based Source Routing using VLAN tags in SDN data centers

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

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UPB Scientific Bulletin, Series C: Electrical engineering and computer Science 2017年第2期79卷 15-24页

作者： Poncea, Ovidiu Mihai Moldoveanu, Florica Asavei, Victor Dept of Computer Science and Engineering Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania

Source Routing allows a node in the path of a packet to specify partially or completely the route taken by that packet. The route is appended to packet header as a list of nodes to traverse, therefore making simple, stateless forwarding decisions. In this paper, we present a novel approach of Source Routing in SDN that uses stacked VLAN tags. Our solution was validated in Mininet using the Ryu controller and proven to have multiple advantages over other forwarding methods.

关键词： Mininet Networking SDN Source Routing VLAN

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Grid-following three-phase inverter with RMS current-limiting property 12

Grid-following three-phase inverter with RMS current-limitin...

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12th Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion, MEDPOWER 2020

作者： Skentzos, Panagiotis Konstantopoulos, George C. Dept. of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Dept. of Electrical and Computer Engineering University of Patras Rio26504 Greece

ISBN: (纸本)9781839535635

A novel nonlinear controller that inherently limits the RMS value of a three-phase grid-following inverter current is presented in this paper. Using the dynamic model of the inverter in the rotating dq reference frame, a nonlinear control scheme is formulated to ensure accurate real and reactive power regulation with RMS current limitation that avoids the use of saturation units with upper/lower limit adaptation, as commonly used in the existing approaches. In particular, it is analytically proven by using fundamental nonlinear systems theory, that the RMS value of the inverter current will never violate a given maximum value, both during the transient response and at the steady-state. Moreover, a detailed root locus analysis is provided to guarantee the asymptotic stability of the desired equilibrium point for the closed-loop system. Finally, to validate the proposed controller performance, simulation results of a grid-following three-phase inverter equipped with the proposed control approach are presented under both normal and unrealistic values of the real and reactive power setpoints. © 2020 Institution of engineering and Technology. All rights reserved.

关键词： Asymptotic stability

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From physical modelling to compositional models of hybrid systems 3rd

From physical modelling to compositional models of hybrid sy...

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3rd International Symposium on Formal Techniques in Real Time and Fault Tolerance Organized Jointly with Working Group Provably Correct Systems, ProCoS 1994

作者： Nadjm-Tehrani, Simin Strömberg, Jan-Erik Dept. of Computer and Information Science Linköping University Sweden Div. of Automatic Control Dept. of Electrical Engineering Linköpmg Unversity LinköpingS-581 83 Sweden

ISBN: (纸本)9783540584681

By a hybrid system we mean a discrete controller in interaction with a physical environment. This paper discusses methodologies for incorporating physically grounded models in representations of hybrid systems. To this end, we study a driver support system, an example which includes unmodelled inputs. We consider models at different levels of abstraction. First, we show that discrete models of the environment can be obtained from the continuous models without losing relevant information. We do this using an analysis of the continuous state space. Dynamic Transition Systems (DTS) are used for the modular modelling at this level of abstraction. Next, we consider models using Hybrid Transition Systems (HTS). This can be seen as a modular version of timed transition systems ailowing both differential and algebraic equations in each mode. Finally, we comment on expressivity requirements on hybrid formalisms for modelling realistic physical systems. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Hybrid systems

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