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A Simulation Study of Consensus Speed over Scale-Free Networks

IFAC Proceedings Volumes 2009年第22期42卷 74-79页

作者： Wei Sun YangQuan Chen Dept. of Automatic Control Beijing Institute of Technology Beijing 100081 China Center for Self-Organizing and Intelligent Systems (CSOIS) Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 USA

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 ( d min ) for the nodes, the algebraic connectivity (λ 2 ) of the network topology is studied, as well as the time ( t c ) (or iteration ( k c ), for discrete algorithm) taken to reach consensus. The results exhibit that λ 2 decreases while γ increases. The λ 2 increases monotonically as d min grows, and they fit very well in a linear relationship. t c (or k c ) decreases as γ reduces and d min increases. Via observing the behavior of the largest eigenvalue (λ n ) 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.

关键词： Scale-free network consensus algebraic connectivity network robustness

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Robust Model Predictive control of continuous-time sampled-data nonlinear systems with Integral Sliding Mode

Robust Model Predictive Control of continuous-time sampled-d...

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European control Conference (ECC)

作者： M. Rubagotti D.M. Raimondo A. Ferrara L. Magni Dept. of Computer Engineering and Systems Science University of Pavia Pavia Italy Automatic Control Laboratory Swiss Federal Institute of Technology Zürich Switzerland

A hierarchical Nonlinear Model Predictive control (NMPC) scheme with guaranteed Input-to-State-practical-Stability (ISpS) is proposed. The controller is formed by an Integral Sliding Mode (ISM) controller and a NMPC one. The ISM, relying on the knowledge of the nominal continuous-time model of the system and of the piecewise constant control signal generated by the NMPC produces a control action aimed at reducing the difference between the dynamics of the nominal closed-loop system and the actual evolution of the state. The NMPC in this way can be designed based on a system with reduced uncertainty. In order to prove the stability of the overall control scheme, some general Regional ISpS results for continuous-time systems are proven.

关键词： Robustness Closed loop systems Uncertainty Stability analysis Economic indicators Manifolds Predictive control

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Signal compaction by maximum verisimilitude

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UPB Scientific Bulletin, Series C: Electrical Engineering 2008年第3期70卷 59-74页

作者： Stefanoiu, Dan Culita, Janetta Dept. of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania

Sampled data provided by a process are usually corrupted by various noises. Although data are required to be denoised before applying any further processing, the corrupting noises could encode a part of desired information. A partial denoising is suitable in this case, as part of pre-processing procedure. Another requirement frequently used in data pre-processing is to compress the useful information in a smaller number of data. Partial denoising and compression are gathered in the concept of "signal compaction". The paper introduces an original method for providing compacted preliminary data, relied on the concept of "verisimilitude" and requiring no synchronization signal accompanying the acquired data.

关键词： Compaction

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Towards a new generation of intelligent manufacturing systems

Towards a new generation of intelligent manufacturing system...

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2008 4th International IEEE Conference Intelligent Systems, IS 2008

作者： Dumitrache, Loan Caramihai, Simona I. Politehnica University of Bucharest Dept. of Automatic Control and Computer Science 313 Sp1aiu1 Independentei Bucharest Romania

ISBN: (纸本)9781424417391

The paper intends to present a modeling philosophy, that allows a global view of a generic manufacturing enterprise behavior, combining managerial and control approaches. The main objective of the assessment is to design a System architecture for Manufacturing that will be able to develop an intelligent comportment displaying characteristics like environment adaptability, problem solving and learning from experience. The foundations of this approach are mainly knowledge management and control engineering techniques, as well as agent-based architectures. © 2008 IEEE.

关键词： Knowledge management

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Design procedure for inverse model command: control method for nonlinear processes

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UPB Scientific Bulletin, Series C: Electrical Engineering 2008年第3期70卷 87-100页

作者： Lupu, Ciprian Petrescu, Catalin Ticlea, Alexandru Dimon, Catalin Udrea, Andreea Irimia, Bogdan Dept. of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania

Structures with inverse model represent one of the successful solutions for the real-time control of the nonlinear processes. The use of these structures imposes solving some specific problems, like determination of static characteristic of the process, construction of inverse model or robust control law design. The paper proposes a structure and the correspondent original methodology of designing and physically implementation based on inverse model command. The applicability of the structure is proved using a real-time structure with an RST control algorithm. In the end, its software implementation and the obtained results are also shown.

关键词： Robust control

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Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

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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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Obtaining ship trajectories of an autonomous in-scale fast-ferry by identifying a heading model

Obtaining ship trajectories of an autonomous in-scale fast-f...

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IEEE International Symposium on Intelligent Signal Processing

作者： Velasco, F. J. Revestido, E. Lopez, E. Moyano, E. Dept. Electronics Technology and Systems Engineering and Automatic Control Univ. Cantabria Dept. Sciences and Navigation Technics Engines and Naval Architecture Univ. País Vasco (UPV/EHU) Dept. Applied Mathematics and Computing Sciences Univ. Cantabria

ISBN: (纸本)9781424408290

The aim of this paper is to obtain a model for an in-scale fast-ferry model TF-120 including the dynamics and kinematics, using a remote experimentation platform for marine vehicles. The physical model is autonomous and is controlled remotely from a PC using Wi-Fi communications. The identification and validation of the dynamical model is obtained with turning circle maneuverings. In this model are included the kinematical equations. The tests with the autonomous in-scale physical model of the high-speed ship were carried out in the surroundings of the Bay of Santander. With this model. simulations with several turbojets angles are made.

关键词： parametric identification ship physical model manoeuvring heading idemification

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MDCT-based perceptual hashing for compressed audio content identification

MDCT-based perceptual hashing for compressed audio content i...

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2007 IEEE 9Th International Workshop on Multimedia Signal Processing, MMSP 2007

作者： Yuhua, Jiao Bian, Yang Mingyu, Li Xiamu, Niu School of Computer Science and Technology Harbin Institute of Technology Harbin China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

ISBN: (纸本)1424412749

In this paper, a perceptual audio hashing method in compressed domain is proposed for content identification, in which MDCT coefficients as the intermediate decoding result are selected for perceptual feature extraction and hash generation. The perceptual feature extraction is based on psychoacoustic model and exhibits good discrimination ability for different audio contents but robustness against common audio signal processing operations. Via feature extraction in the compressed domain, the MDCT-based compressed audios, such as MP3, AAC, etc., could be efficiently identified without complete decoding which facilitates those practical applications with strict requirements of memory and computational complexity, such as online audio retrieval, indexing of massive compressed audio data, audio identification by mobile phone, etc. The algorithm is highly robust against MDCT compression which is widely used in audio coding. Experiments demonstrate the effectiveness of the proposed scheme. © 2007 IEEE.

关键词： Feature extraction

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Discrete Event based approach to the simulation of a continuous naval system

Discrete Event based approach to the simulation of a continu...

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作者： Chaos, Dictino Aranda, Joaquín Muñoz, Rocío Díaz, José Manuel De La Cruz, Jesús M. Dept. Informática y Automática UNED C/ Juan del Rosal16 28040 Madrid Spain Dept of Computers Architecture and Automatic Control UCM 28040 Madrid Spain

ISBN: (纸本)9783902661623

In this work a simulation platform for uninhabited marine and aerial vehicles is proposed. This platform is based in the MDA (Model Driven architecture) approach and the DEVS (Discrete Event System Specification) formalism. Platform independent models (PIM) are used to describe the vehicles and its interaction;then, theses models are traduced to platform-specific models (PSMs) in Matlab-Simulink, Java and other languages. DEVS formalism is designed to describe discrete events model, so in order to use continuous time models the second order quantified states simulation (QSS2) is proposed. This method is applied to an autonomous radio controlled hovercraft and its low level tracking controller. Copyright © 2007 IFAC.

关键词： MATLAB

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An integrated image fusion technique for boosting the quality of noisy remote sensing images

An integrated image fusion technique for boosting the qualit...

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24h National Radio Science Conference, NRSC 2007

作者： Nasr, M.E. Elkaffas, S.M. El-Tobely, T.A. Ragheb, A.M. Abd El-Samie, F.E. Electronic and Communication Engineering Department Tanta University Egypt Info. Tech. Dept. Inst. of Graduate Studies and Research Alexandria University Egypt Computer and Automatic Control Department Tanta University Egypt Communication Department Menofia University Egypt

To better identify the objects in remote sensing images, the multispectral images with high spectral resolution and low spatial resolution, and the panchromatic images with high spatial resolution and low spectral resolution need to be fused. Many fusion techniques are discussed in the recent years to obtain images with high spectral resolution and also high spatial resolution. In this paper an image fusion technique, based on integrating both the Intensity-Hue-Saturation (IHS) and the Discrete Wavelet Frame Transform (DWFT), is proposed for boosting the quality of remote sensing images. A panchromatic and multispectral image from Landsat-7(ETM+) satellite has been fused using this new approach. Experimental results show that the proposed technique improves the spectral and spatial qualities of the fused images. Moreover, when this technique is applied to noisy and de-noised remote sensing images it can preserve the quality of the fused images. Comparison analyses between different fusion techniques are also presented and show that the proposed technique outperforms the other techniques.

关键词： Image fusion

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