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OCEANS - Europe

作者： E. Revestido F. J. Velasco I. Zamanillo E. López E. Moyano Department Electronic Technology Systems Engineering and Automatic Control E.T.S. de Náutica University Cantabria. Cantabria Spain Department Sciences and Navigation Techniques Engines and Naval Architecture E.T.S. de Náutica y Mquinas Navales University of the Bask Country Bizkaia Spain Department Applied Mathematics and Computing Sciences E.T.S. de Ingenieros Industriales y Telecomunicación University of Cantabria Santander Spain

In this paper, it is applied a method for parameter estimation of ship linear maneuvering models with a standard zig-zag maneuver. The parameter estimation is made based on prediction error methods, using the Kalman filter for the states estimation. It is suggested two cases of study: one in simulation and another one with data acquired in open waters. Thus, it is posible to quantify the statistical properties of the estimator by means of Monte Carlo simulation and to validate the model with simulated and acquired data.

关键词： Mathematical model Data models Marine vehicles Parameter estimation Propellers Noise Noise measurement

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A new on-line indicator of biopolymer content in bacterial cultures

A new on-line indicator of biopolymer content in bacterial c...

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作者： Hrnčiřík, Pavel Vovsík, J. Náhlík, J. Department of Computing and Control Engineering Institute of Chemical Technology Prague Technická 5 166 28 Praha 6 Czech Republic

ISBN: (纸本)9783902661708

This paper describes the application of an impedance spectroscopy based analyser in combination with standard off-gas measurements for on-line monitoring of an intracellular biopolymer accumulation during a bioproduction process (Pseudomonas putida KT2442 fed-batch cultivation). Using exclusively on-line measurements a new physiological indicator of biopolymer accumulation in bacterial cells is proposed. The indicator, which could be referred to as an "obesity" quotient, is based on capacitance difference signal carrying information on number of cells and cumulative oxygen consumption related to dry cell weight. © 2010 IFAC.

关键词： Capacitance

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Sensing Semantics of RSS Feeds by Fuzzy Matchmaking

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Intelligent Information Management 2010年第2期2卷 110-119页

作者： M.W. Yuan P. Jiang J. Zhu X.N. Wang Department of Information and Control Engineering Tongji University Department of Computing University of Bradford

RSS feeds provide a fast and effective way to publish up-to-date information or renew outdated contents for information subscribers. So far RSS information is mostly managed by content publishers but Internet users have less initiative to choose what they really need. More attention needs to be paid on techniques for user-initiative information discovery from RSS feeds. In this paper, a quantitative semantic matchmaking method for the RSS based applications is proposed. Semantic information is extracted from an RSS feed as numerical vectors and semantic matching can then be conducted quantitatively. Ontology is applied to provide a common-agreed matching basis for the quantitative matchmaking. In order to avoid semantic ambiguity of literal statements from distributed and heterogeneous RSS publishers, fuzzy inference is used to transform an individual-dependent vector into an individual-independent vector. Semantic similarities can be revealed as the result.

关键词： RSS Feeds Matchmaking Multi-Agent Semantics

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Global robust output regulation for nonlinear systems with iISS inverse dynamics

Global robust output regulation for nonlinear systems with i...

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IEEE International Conference on Automation and Logistics

作者： Xu, Dabo Huang, Jie Applied Control and Computing Laboratory Department of Mechanical and Automation Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)9781424483754

This paper develops an approach to dealing with the global robust output regulation problem for a class of nonlinear systems with integral input-to-state stable (iISS) inverse dynamics by using output feedback control. As iISS condition is strictly weaker than ISS condition, the result of this paper applies to a larger class of nonlinear systems. © 2010 IEEE.

关键词： Stabilization

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Chidori - A bio-inspired cognitive architecture for collective robotics applications

Chidori - A bio-inspired cognitive architecture for collecti...

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作者： Vasile, Cristian Pavel, Ana Buiu, CǍtǍlin Laboratory of Natural Computing and Robotics Department of Automatic Control and Systems Engineering Politehnica University of Bucharest Spl. Independentei 313 060042 Bucharest Romania

ISBN: (纸本)9783902661890

A cognitive collaborative multi-agent control architecture that addresses real-world control problems for swarms of mobile robots is proposed. The swarm's emergent behaviour is obtained by using a distributed Particle Swarm Optimization inspired algorithm. A swarm-user interface is also presented and offers a way for a human operator to interact with and guide the robotic swarm without limiting its emergent intelligence. The architecture is designed as a multi-agent system developed using JADE Framework. Three types of agents were defined: local behaviour agent, social behaviour agent and graphical user interface (GUI) agent. Each robot is associated with a pair of a local and a social behaviour agents which implement the reactive component and the interaction between the robots. The swarm forms a hierarchical structure composed of subswarms and neighbourhoods based on tasks and goals defined by the user or the swarm itself. The GUI agent is used as a link between the human expert and the swarm. The architecture was tested on a swarm of e-puck robots.

关键词： Multi agent systems

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Output regulation of time-varying nonlinear systems

Output regulation of time-varying nonlinear systems

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作者： Yang, Xi Huang, Jie Applied Control and Computing Laboratory Department of Mechanical and Automation Engineering Chinese University of Hong Kong Shatin NT Hong Kong

ISBN: (纸本)9787894631046

This paper considers the robust output regulation problem for nonlinear time-varying systems with a time-varying exosystem. A framework for converting the problem into a stabilization problem of an augmented system is established. The problem is solved for a class of time-varying output feedback systems with a time-varying exosystem.

关键词： Time varying systems

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Robust adaptive sliding mode control for uncertain delta operator systems

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International Journal of Adaptive control and Signal Processing 2010年第8期24卷 623-632页

作者： Yang, Hongjiu Xia, Yuanqing Fu, Mengyin Shi, Peng Department of Automatic Control Beijing Institute of Technology Beijing 100081 China Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd CF37 1DL United Kingdom School of Engineering and Science Victoria University Melbourne VIC 8001 Australia

In this paper, a robust adaptive sliding mode controller is presented for delta operator systems with mismatched uncertainties and exogenous disturbances. The parameters of the delta operator system are taken for norm-bounded uncertainties. The exogenous disturbance is also assumed to be bounded. After the statement of a sufficient condition for the existence of linear sliding surface based on linear matrix inequality technique, a robust reaching motion control method for delta operator systems is presented. Afterwards, an adaptive sliding mode controller for delta operator systems is designed. A bridge between the robust adaptive sliding mode control and the delta operator system framework is made. Numerical example is given to illustrate the effectiveness of the developed techniques. Copyright © 2009 John Wiley & Sons, Ltd.

关键词： Linear matrix inequalities

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Automatic Bioindicator Images Evaluation

Automatic Bioindicator Images Evaluation

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International Conference on Intelligence engineering Systems

作者： P. Slavikova M. Mudrova A. Prochazka Department of Computing and Control Engineering Institute of Chemical Technology

ISBN: (纸本)9781424476527

Presented paper deals with processing of electron-microscope images of Picea Abies stomas. A stoma character strongly depends on the level of air pollution in the area where the tree grows - as the stoma epidermis covers with epiticular waxes to protect itself against the negative environmental influences. According to the level of incrustation it is possible to distinguish five classes of stoma structure. An automatic algorithm recognizing a degree of stoma damage, based on the microscopic image processing can be useful during the process of environmental assessment. This work is devoted to a solution of the problem of stoma evaluation by means of texture classification. There are two principles discussed in the paper: The first principle is based on gradient methods while the second one uses a wavelet transform. Possibilities of application of mentioned attitudes were investigated and the classification criteria distinguishing the stoma character were suggested, as well. The resulting algorithm was verified on a library of four hundred real images and achieved results were compared with an expert's sensual classification. Selected methods of image preprocessing as noise reduction, brightness correction and resampling were used as well.

关键词： Air pollution Epidermis Protection Image recognition Microscopy Image processing Gradient methods Wavelet transforms Libraries Noise reduction

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Improving the learning experience for the first year engineering students using technology enabled Activity Led Learning

Improving the learning experience for the first year enginee...

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engineering Education 2010: Inspiring the Next Generation of Engineers, EE 2010

作者： Ramachandran, Jayaraman Haas, Olivier C.L. Department of Computing and Digital Environment Coventry University Coventry United Kingdom Control Theory and Applications Centre Department of Mathematics Statistics and Engineering Science Coventry University Coventry United Kingdom

Activity Led Learning (ALL) strategies were adopted to improve the students engagement, pass rate and most importantly learning experience for a first year Electrical and Electronic engineering module which caters for a large mixed student cohort. To implement ALL, a new method of delivery, enabled using three key learning technologies, was adopted. The number of formal lectures was reduced and replaced with interactive tutorials as well as additional computer based laboratory sessions. Tutorial sessions were implemented using Interwrite® Personal Response System (PRS), a commercial Audience Response System (ARS). The Multisim® simulation software was introduced in the laboratory sessions to help students visualise the behaviour of electrical and electronic components and apply circuit laws. The adopted assessment strategy combined problem based laboratory together with on-line assessment, created using RESPONDUS®, and an in-class test. Students satisfaction survey, coursework submission rate, focus group as well as informal feedback were used to evaluate the relative benefits of the introduced technology enabled ALL strategies. Laboratory sessions improved students engagement resulting in increased coursework submission rate. ARS promoted group work and interaction, resulting in greater students learning experience. The variety and division of the assessment into small components promoted regular work and was well received by the students. Overall, the adopted strategy had a positive impact on students learning experience, increased students participation in terms of coursework submission which resulted in improved students achievement. The pass rate of the module increased from 70% to 87% and the student satisfaction improved from adequate to satisfactory. © 2009 Jayaraman Ramachandran and Olivier C.L. Haas.

关键词： Students

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Wavelet use for reduction of watershed transform over-segmentation in biomedical images processing

Wavelet use for reduction of watershed transform over-segmen...

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： Aleš Procházka Oldrich Vysata Eva Jerhotova Department of Computing and Control Engineering Department of Computing and Control Engineering Prague 6 Czech Republic Neurocenter Caregroup Rychnov nad Kněžnou Czech Republic

Problems of multi-dimensional signal enhancement, segmentation, feature extraction and components classification is essential in many engineering and biomedical applications. The paper is devoted to the use of watershed transform and wavelet transform for MR image components detection and discussion of over-segmentation problems. The goal of the paper is in (i) analysis of image de-noising, (ii) discussion of image enhancement, and (iii) multi-resolutional approach application for reduction of over-segmentation problems. Proposed algorithms include the use of wavelet transform and gradient methods in the preprocessing stage and application of the watershed transform for enhanced images. Resulting algorithms are verified for simulated images and applied for a selected MR biomedical images containing different structures.

关键词： Image segmentation Biomedical imaging Image edge detection Robustness Discrete wavelet transforms Time frequency analysis

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