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16th European Conference on Artificial Intelligence, ECAI 2004

作者： Barrachina, Sergio Vilar, Juan Miguel Dpt. of Computer Engineering and Science Universitat Jaume I Castellón Spain Dpt. of Programming Languages and Computer Systems Universitat Jaume I Castellón Spain

ISBN: (纸本)9781586034528

We describe a method to automatically discover translation collocations from a bilingual corpus and how these improve a machine translation system. The process of inference of collocations is iterative: An alignment is used to derive an initial set of collocations, these are used in turn to improve the alignment and this new alignment is used to generate new collocations. This process is repeated until no more collocations are found. The final alignment and the set of collocations are used to train a translation model. We use a model that is based on finite state transducers and word clusters and has been modified to work with collocations in addition to single words. We present experiments in which we show that automatic collocations improve translation quality without prior linguistic information.

关键词： Alignment

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Hybrid control of a four tanks system 7th

Hybrid control of a four tanks system

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7th International Symposium on Advanced Control of Chemical Processes, ADCHEM 2003

作者： de Prada, C. Cristea, S. Megias, D. Serrano, J. Dpt. Systems Engineering and Automatic Control University of Valladolid Faculty ofSciences c/ Real de Burgos s/n Valladolid47011 Spain Dpt. Systems Engineering and Automatic Control ETSE Universitat Autónoma de Barcelona Bellaterra Barcelona08193 Spain

Many processes, even being of a continuous nature, involve in its operation signals or rules different from the classical continuous variables represented by real variables and modelled by DAE. In practice they include on/off valves or other binary actuators, are subjected to logical operational rules, or are mixed with sequential operations. As a result, classical control does not fit very well with the overall operation of the plant. In this paper we consider the problem of hybrid control from a predictive control perspective, showing in a practical non trivial example with changing process structure, how the problem can be stated and solved. Copyright © IFAC 2003

关键词： Real variables

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Hybrid Control of a Four Tanks System

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IFAC Proceedings Volumes 2004年第1期37卷 749-754页

作者： C. de Prada S. Cristea D. Megías J. Serrano Dpt. Systems Engineering and Automatic Control University of Valladolid Faculty of Sciences c/ Real de Burgos s/n 47011 Valladolid Spain Dpt. Systems Engineering and Automatic Control ETSE Universitat Autónoma de Barcelona 08193 Bellaterra Barcelona Spain Tel. (+34) 935 813 027 Fax (+34) 935 813 033

关键词： Hybrid control predictive control four tank system

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Real-time dynamic data-driven simulation of continuum systems

Real-time dynamic data-driven simulation of continuum system...

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2004 ASME Design engineering Technical Conferences and computers and Information in engineering Conference

作者： Michopoulos, J.G. Farhat, C. Houstis, E.N. Special Projects Group Compl. Multiphysics Systems Lab U.S. Naval Research Laboratory Washington DC 20375 United States Dept. of Aerospace Eng. Sciences Center of Aerospace Structures Univ. of Colorado at Boulder Boulder CO 80309-0429 United States Computer Sciences Department Purdue University W. Lafayette IN 47906 United States University of Thessaly Dpt. of Computer Engineering Volos Greece

Recent proliferation of sensor networks in various application areas has promoted real-time behavioral monitoring of various physical systems. The opportunity to use sensor generated data dynamically for improving speed, accuracy, and general performance of predictive behavior modeling simulation is of paramount importance. The present paper identifies enabling modeling methods and computational strategies that are critical for achieving real-time or near real-time simulation response of very large and complex systems. It also discusses our choices of these technologies in the context of sample multidisciplinary computational mechanics applications and describes two examples to demonstrate the feasibility of integrating real-time data with real-time simulation.

关键词： Continuum mechanics

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Incremental and iterative monolingual clustering algorithms 8

Incremental and iterative monolingual clustering algorithms

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Barrachina, Sergio Vilar, Juan Miguel Dpt. of Computer Engineering and Science Universidad Jaume i Spain Dpt. of Programming Languages and Computer Systems Universidad Jaume i Spain

To reduce speech recognition error rate we can use better statistical language models. These models can be improved by grouping words into word equivalence classes. Clustering algorithms can be used to automatically do this word grouping. We present an incremental clustering algorithm and two iterative clustering algorithms. Also, we compare them with previous algorithms. The experimental results show that the two iterative algorithms perform as well as previous ones. It should be pointed out that one of them, that uses the leaving one out technique, has the ability to automatically determine the optimum number of classes. These iterative algorithms are used by the incremental one. On the other hand, the proposed incremental algorithm achieves the best results of the compared algorithms, its behavior is the most regular with the variation of the number of classes and can automatically determine the optimum number of classes.

关键词： Clustering algorithms

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A deformable model-based visual system for mobile robot topologic navigation

A deformable model-based visual system for mobile robot topo...

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Proceedings 2003 IEEE/RSJ International Conference on Intelligent Robots and systems (IROS 2003) (Cat. No.03CH37453)

作者： M. Mata J.M. Armingol A. de la Escalera F.J. Rodriguez Computer Architecture and Automation Dpt. Universidad Europea de Madrid Madrid Spain Systems Engineering and Automation Dpt. Universidad Carlos III de Madrid Madrid Spain

Deformable models have been intensively studied in image analysis through the last decade, and are used for detection and recognition of flexible or rigid templates under diverse viewing conditions. Genetic algorithm (GA) based deformable models are used for generic visual landmark detection and interpretation. The developed system allows topologic localization and navigation using natural and artificial landmarks, exploiting deformable models' ability for handling landmark perspective variations. The resulting perception module has been integrated successfully in a complex navigation system. Various experimental results in real environments are presented on this paper, showing the effectiveness and capacity of the landmark detection and reading system.

关键词： Deformable models Visual system Mobile robots Navigation Robotics and automation Image recognition Object detection Object recognition Uncertainty Image motion analysis

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A novel W-band radar for airport traffic monitoring: implementation, first operational results, perspectives

A novel W-band radar for airport traffic monitoring: impleme...

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International Kharkov Symposium on Physics and engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： F. Mauro G. Galati M. Naldi Oerlikon Contraves Rome Italy Dpt. of Computer Science SYstems and Production Engineering (DISP) Roma Italy Department of Computer Science Systems and Production Engineering (DISP) Tor Vergate University Rome Italy

High resolution requirements for airport surface traffic monitoring with lightweight, small, all-weather sensors call for the use of a network of millimetre-wave radars to perform the surveillance function in the surface movement control and guidance system. In this paper a W-band radar employed as the basic sensor is described. Some results of recent and present field trials are reported.

关键词： Radar Airports Monitoring Communication system traffic control Air traffic control Sensor systems Surveillance Lighting control Control systems Sensor phenomena and characterization

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Iterative Feedback Tuning of a PID in a Pilot Plant

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IFAC Proceedings Volumes 2000年第4期33卷 545-551页

作者： Rogelio Mazaeda Céar de Prada ISPJAE Cuba at present with the Dpt. Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos s/n 47011 Valladolid Spain. tlf. +34 983 423162 Fax +34 983 423161 Dpt. Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos s/n 47011 Valladolid Spain. tlf. +34 983 423164 Fax +34 983 423161.

Iterative Feedback Tuning (IFT) is a tuning method that adjust on-line the parameters in the controller so that a performance criterion is minimised. The IFT method uses only experimental data obtained from the closed loop system without assuming knowledge of the plant or perturbations models. In this paper the application of IFT to the tuning of a PID controller of a pilot plant is reported. The impact on the achieved system performance due to time weighting of the control error is particularly addressed.

关键词： Iterative Feedback Tuning PID control Process control

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Supervision and Advanced Control in a Beet Sugar Factory

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IFAC Proceedings Volumes 2000年第10期33卷 341-346页

作者： C. Prada C. Alonso F. Morilla M. Bollain Dpt. Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid 47011 Valladolid Spain. TL. + 34 983 423164 Fax + 34 983 423161 Dpt. Computing Science Faculty of Sciences University of Valladolid 47011 Valladolid Spain. TL. + 34 983 425005 Fax + 34 983 423161 e-mail Dpt. Computing Science and Automatic Control Faculty of Sciences Open University UNED c/ Senda del Rey s/n 08040 Madrid Spain. TL. + 34 91 3987156 Fax + 34 91 3986697 e-mail Azucarera Ebro Agricolas (AEA) c/ Ruiz de Alarcón 5 Madrid Spain TL. +34 91 5214650 Fax +34 91 5216407

An integrated advanced control and supervision system in operation in a sugar factory is presented. The system works on top of a commercial distributed computer control system, and combines artificial intelligence tec... 详细信息

关键词： Hierarchical control supervisory control expert systems fault detection fault diagnosis predictive control optimization

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Stability guarantee in predictive control delta domain

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IFAC Proceedings Volumes 1999年第2期32卷 4624-4629页

作者： C. Prada S. Cristea A.G. Kuznetsov Dpt. of Systems Engineering and Automatica Faculty of Sciences University of Valladolid 47011 Valladolid Phone: + 34 983 423164 Fax: +34 983 423161 Spain Edinburgh Petroleum Services Ltd. Research Park Riccarton Edinburgh EH14 4AP U.K.

In this paper the problem of assuring nominal stability in constrained predictive control is addressed for the case when, due to disturbances, inadequate constraints, etc., the reference cannot be reached within the prediction horizon. The proposed algorithm is formulated in the delta domain, but the idea can be extended to other kind of models. It combines the cancellation of modes at the end of the prediction horizon with a minimization of the distance to the controller reference. In this way, it assures stability even with open loop unstable processes while, at the same time, avoids the feasibility problems.

关键词： Predictive control Stability Constraints Control algorithms Delta domain

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