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IEEE International Conference on systems, Man and Cybernetics

作者： Nazaraf Shah hi-Chun Lo Chun-Lung Huang Kuo-Ming Chao Nick Godwin Department of Computcr and Network Systems Distributed System and Modeling Research Group Coventry University UK Institute of Information Management National Chiao Tung University Taiwan Department of Computer and Network Systems Coventry University UK

Agent oriented architectures and service oriented architectures (SOA) have many features in common such as loose coupling and provision and consumption of services. Software agent systems have been used in many commercial applications due to their attractive attributes such as autonomy, flexibility and a rich and complex set of interaction protocols. Agents in such systems provide and consume services on behalf of their owners. These systems are prone to various kinds of runtime exceptions due to the dynamic nature of open environments and the different programming models involved in the provision of a particular service. Diagnosis of underlying causes of these exceptions is critical for the successful and reliable operation of agent oriented services. This paper presents and discusses a sentinel agent based approach for diagnosing the underlying causes of runtime exception for agent-oriented services.

关键词： Web services Simple object access protocol Runtime Service oriented architecture Electronic mail computer networks distributed computing Chaos Dynamic programming Information management

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Comparison of Image Processing Resource Allocation for Multi-Target Tracking of Dismounted Targets

Comparison of Image Processing Resource Allocation for Multi...

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International Conference on Information Fusion

作者： Jon P. Champion Juan R. Vasquez Distributed Information Systems Branch Air Force Research Laboratory Rome NY USA Department of Electrical and Computer Engineering WPAFB Air Force Institute of Technology OH USA

ISBN: (纸本)1424409535

Dismounted targets can be tracked in urban environments with video sensors. Real-time systems are unable to process all of the imagery, demanding some method for prioritization of the processing resources. Furthermore, various segmentation algorithms exist within image processing, each algorithm possesses unique capabilities, and each algorithm has an associated computational cost. Additional complexity arises in the prioritization problem when targets become occluded (i.e., a building) and when the targets are intermixed with other dismounted entities. This added complexity leads to the question "which portions of the scene warrant both low cost and high cost processing?" The approach presented in this paper is to apply multi-target tracking techniques in conjunction with an integer programming optimization routine to determine optimal allocation of the video processing resources. This architecture results in feedback from the tracking routine to the image processing function which in turn enhances the ability of the tracker

关键词： Image processing Resource management Target tracking Costs Real time systems Image segmentation Computational efficiency Layout Linear programming Feedback

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Physical robot agents: Coordinated intelligent and rational agents for collaborative robots

Physical robot agents: Coordinated intelligent and rational ...

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作者： Ghenniwa, H. Eze, J. Shen, W. Department of Electrical and Computer Engineering University of Western Ontario London Canada EK3 Technologies Inc. London Canada Integrated Manufacturing Technologies Institute National Research Council Canada London Canada University of Western Ontario Canada Cooperative Distributed Systems Engineering Group Canada EK3 Technologies Inc. Canada National Research Council of Canada's Integrated Manufacturing Technologies Institute Canada IEEE Canada AAAI Canada ACM Canada ASME Canada

This paper reports on ongoing research to design coordination and cooperation ubiquitous to the control and tasking of multiple heterogeneous physical robot agents (PRAs) using a real-time agent architecture. The primary objective of the work presented here is to develop a real-time agent architecture and a distributed architectural framework that enables multiple PRAs to coordinate time-constrained high-level tasks in a collaborative manner. At the abstract level, we identify two layers, cognitive and action, based on the type of the PRA's responsibilities. At the cognitive layer we propose an extended version of the coordinated, intelligent rational agent (CIR-agent) model for complex real-time systems. The architecture facilitates integration between the cognitive layer and the action layer through the controller and functional modules. Our architecture also recognizes the coexistence of agent-oriented frameworks, such as JADE, and non-agent frameworks, like CORBA, to accommodate the cognitive and the action layers respectively.

关键词： Intelligent agents

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Implementing enterprise collaboration using web services and software agents

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International Journal of Networking and Virtual Organisations 2006年第2期3卷 185-201页

作者： Namin, Akbar Siami Shen, Weiming Ghenniwa, Hamada Integrated Manufacturing Technologies Institute National Research Council Canada London Ont. Canada Department of Electrical and Computer Engineering University of Western Ontario London Ont. Canada National Research Council Canada Canada University of Western Ontario Canada Department of Electrical and Computer Engineering The University of Western Ontario Canada Cooperative Distributed Systems Engineering Group Canada

Global competition has forced manufacturing enterprises to collaborate towards fulfilling market demands and satisfying customers. A major challenge in implementing enterprise collaboration is on the integration of heterogeneous hardware and software platforms. This paper proposes to implement enterprise collaborations by employing web services and software agents. It presents a multi-layer architecture for enterprises' software infrastructure capable of accomplishing the necessary functionalities in typical collaborations such as resource discovery, workflow coordination, request analyses, tasks assignment and monitoring. In addition, this paper proposes an agent-based multi-layer structure for service discovery to improve the functionality and efficiency of resource discovery. Copyright © 2006 Inderscience Enterprises Ltd.

关键词： computer supported cooperative work

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CNNUM-Based Methods Using Deformable Contours on Smooth Boundaries

CNNUM-Based Methods Using Deformable Contours on Smooth Boun...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Tamas Szabo Peter Szolgay Department of Image Processing and Neurocomputing Faculty of Information Technology University of Pannonia Veszprem Hungary Analogical and Neural Computing Systems Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

In this paper two methods are presented. A CNNUM-based method is shown to quantify the displacement of the normal interhemisperic bilateral symmetry line. The method uses a deformable open contouring technique. Anothe... 详细信息

关键词： Active contours Computed tomography Magnetic resonance Anatomical structure Image segmentation Biomedical imaging Electronic mail computer networks Pixel Image resolution

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Stereo Vision based Relative Pose and Motion Estimation for Unmanned Helicopter Landing

Stereo Vision based Relative Pose and Motion Estimation for ...

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International Conference on Information and automation (ICIA)

作者： Cui Xu Liankui Qiu Ming Liu Bin Kong Yunjian Ge Department of Automation University of Science and Technology Hefei Anhui China Center for Biomimetic Sensing and Control Research Institute of Intelligent Machines Chinese Academy and Sciences Hefei Anhui China Department of Electrical and Computer Systems Engineering Monash University Melbourne VIC Australia

In this paper, we present a real-time stereo vision based pose and motion estimation system that will be used for landing an unmanned helicopter on a moving target such as a ship deck. The vision algorithm mainly consists of a feature extraction task and a pose and motion estimation task. The 2D planer target with regular features defined can significantly simplify the feature extraction task such as corner detection and feature points matching. To effectively estimate the distance between the camera carrier and target a stereo camera system is applied. By means of sub-pixel corner location the precisions of pose estimation and relative motion detection can be improved. We present results from semi-physical simulation which show that our vision algorithm is accurate and robust. The methodology provides an effective subsystem for the development of autonomous robot helicopter that will land on a given target under the guide of vision.

关键词： Stereo vision Motion estimation Helicopters Feature extraction Cameras Robot vision systems Real time systems Marine vehicles Metalworking machines computer vision

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Design of Parameterized State Observers and Controllers for a Class of Nonlinear Continuous-Time systems

Design of Parameterized State Observers and Controllers for ...

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IEEE Conference on Decision and Control

作者： A. Alessandri C. Cervellera D. Maccio M. Sanguineti Department of Production Engineering Thermoenergetics and Mathematical Models (DIPTEM) University of Genoa Genoa Italy Institute of Intelligent Systems for Automation (ISSIA-CNR) National Research Council Genoa Italy Department of Communications Computer and System Sciences (DIST) University of Genoa Genoa Italy

ISBN: (纸本)1424401704

The design of observers and controllers for a class of continuous-time, nonlinear dynamic systems with Lipschitz nonlinearities is addressed. Observers and controllers that depend on a linear gain and a parameterized function implemented by a feedforward neural network are considered. The gain and the weights of the neural network are optimized in such way to ensure the convergence of the estimation error for the observer and the stability of the closed-loop system for the controller, respectively. This is achieved by constraining the derivative of a quadratic Lyapunov function to be negative definite on a grid of points, penalizing the constraints that are not satisfied. It is shown that suitable sampling techniques such as low-discrepancy sequences, commonly employed in quasi-Monte Carlo methods for high-dimensional integration, allow one to reduce the computational burden required to optimize the network parameters. Simulations results are presented to illustrate the effectiveness of the method

关键词： Nonlinear control systems Control systems Neural networks Control nonlinearities Observers Gain Feedforward neural networks Convergence Estimation error Stability

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Identification of freeway macroscopic models using information from mobile phones

Identification of freeway macroscopic models using informati...

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American Control Conference (ACC)

作者： A. Alessandri R. Bolla A.F. Grassia M. Repetto Department of Production Engineering Thermoenergetics and Mathematical Models DIPTEM University of Genoa Genoa Italy Department of Communications Computer and System Sciences DIST-University of Genoa Genoa Italy Institute of Intelligent Systems for Automation ISSIA-CNR National Research Council of Italy Genoa Italy

A method for the identification of a freeway macroscopic model is presented. The model is based on the idea of dividing a freeway trunk in sections covered by the cells of the wireless network and associated with state variables describing density of vehicles, mean velocity, and percentage of active mobile phones. Using the density and hand-off measurements from the cellular network, the parameters of such model are identified via an algorithm based on stochastic approximation. Successful simulation results are reported and discussed

关键词： Traffic control Mobile handsets Vehicle dynamics Stochastic processes Cost function Wireless networks Approximation algorithms Detectors Base stations Nonlinear equations

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Dynamics of information access on the web

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Physical Review E 2006年第6期73卷 066132-066132页

作者： Z. Dezsö E. Almaas A. Lukács B. Rácz I. Szakadát A.-L. Barabási Center for Complex Network Research and Department of Physics University of Notre Dame Notre Dame Indiana 46556 USA Microbial Systems Division Biosciences Directorate Lawrence Livermore National Laboratory Livermore California 94551 USA Computer and Automation Research Institute Hungarian Academy of Sciences MTA SZTAKI Budapest Hungary Axelero Internet Provider Inc. 1364 Budapest Hungary Center for Cancer Systems Biology Dana Farber Cancer Institute Harvard University Boston Massachusetts 02115 USA

While current studies on complex networks focus on systems that change relatively slowly in time, the structure of the most visited regions of the web is altered at the time scale from hours to days. Here we investigate the dynamics of visitation of a major news portal, representing the prototype for such a rapidly evolving network. The nodes of the network can be classified into stable nodes, which form the time-independent skeleton of the portal, and news documents. The visitations of the two node classes are markedly different, the skeleton acquiring visits at a constant rate, while a news document’s visitation peaks after a few hours. We find that the visitation pattern of a news document decays as a power law, in contrast with the exponential prediction provided by simple models of site visitation. This is rooted in the inhomogeneous nature of the browsing pattern characterizing individual users: the time interval between consecutive visits by the same user to the site follows a power-law distribution, in contrast to the exponential expected for Poisson processes. We show that the exponent characterizing the individual user’s browsing patterns determines the power-law decay in a document’s visitation. Finally, our results document the fleeting quality of news and events: while fifteen minutes of fame is still an exaggeration in the online media, we find that access to most news items significantly decays after 36hours of posting.

关键词： WORLD-WIDE-WEB COMPLEX NETWORKS DIFFUSION ORGANIZATION INTERNET

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Hierarchical modelling in biology: Systematic building of limb models

Hierarchical modelling in biology: Systematic building of li...

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作者： Fazekas, C.S. Kozmann, G.Y. Hangos, K.M. Department of Information Systems University of Veszprém Veszprém Hungary Research Institute for Technical Physics and Materials Sciences Department of Biomedical Engineering Budapest Hungary Computer and Automation Research Institute Systems and Control Laboratory Budapest Hungary

ISBN: (纸本)008045108X

A multi-level model, that provides a hierarchically structured description of a complex, multi-scale limb system is proposed in this paper for predicting and analyzing movement patters generated by various activation signals. The levels, the sub-models on each level and their interconnections are developed and described following a systematic modelling procedure. The computational properties (degree of freedom and differential index) of the developed model have been analyzed and a sub-model has been transformed to meet the index-one requirement for solving the resulting differential algebraic equation (DAE) model by standard methods implemented in MATLAB. The model is extensively verified against engineering expectations using parameter values found in the literature, and a good agreement was found. Parameter sensitivity analysis has also been performed. Copyright © 2005 IFAC.

关键词： Hierarchical systems

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