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作者： Angulo, Fabiola Fossas, Enric Ocampo, Carlos Olivar, Gerard Department of Electrical Electronic and Computer Science Universidad Nacional de Colombia Cra. 27 No. 64-60 Manizales Colombia Institute of Industrial and Control Engineering Technical University of Catalonia Avda. Diagonal 647 08027 Barcelona Spain Technical University of Catalonia Rambla Sant Nebridi 10 08222 Terrasa Spain Department of Applied Mathematics 4 Technical University of Catalonia Avda. Vctor Balaguer s/n E-08800 Vilanova i la Geltru Spain

ISBN: (纸本)008045108X

in this paper a new design for controlling dynamical systems has been applied to buck converters driven with a PWM centered pulse and (Zero Average Dynamics) ZAD-strategy. Chaotic operation has been stabilized with the so-called Fixed Point induced Control (FPiC) technique. Also, the same converter with delay, whose 1-periodic orbit is always unstable, has been stabilized. Simulations are compared with the TDAS stabilization technique. Once a 1-periodic orbit has been stabilized, the dynamics shows the same characteristics and advantages of the ZAD design, such as robustness, fixed switching frequency (with zero average on the sliding surface) and a low output error. Copyright © 2005 iFAC.

关键词： Stabilization

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NONLiNEAR DYNAMiCS OF A CONTROLLED REVERSE FLOW REACTOR

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iFAC Proceedings Volumes 2005年第1期38卷 501-506页

作者： A. Brasiello L. Russo E. Mancusi M. di Bernardo S. Crescitelli Department of Chemical Engineering University of Naples “Federico II” Piazzale Tecchio 80 80125 Napoli Italy Department of Chemical and Food Engineering University of Salerno via Ponte don Melillo I-84084 Fisciano (SA) Italy Department of Engineering University of Benevento Piazza Roma 82100 Benevento Italy Dept. of Systems and Computer Science University of Naples “Federico II” Italy and Bristol Centre of Applied Nonlinear Mathematics University of Bristol U.K.

A hybrid system approach is adopted to study the dynamic behaviour of a controlled reverse flow reactor in which a feedback control law dictates the occurrence of flow inversions. Typical behaviour of hybrid systems (Zeno phenomena) are found coexisting with other regimes like limit cycles and quasi-periodic regimes. Construction of impact maps, continuation of limit cycles and detection of local bifurcations are employed to understand the influence of Zeno phenomena on bifurcation scenario and on routes to strange attractors.

关键词： Controlled system hybrid Relay control Non-linear analysis Regularization

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STABiLiZATiON OF CHAOS WiTH FPiC: APPLiCATiON TO ZAD-STRATEGY BUCK CONVERTERS

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iFAC Proceedings Volumes 2005年第1期38卷 1183-1188页

作者： Fabiola Angulo Enric Fossas Carlos Ocampo Gerard Olivar Department of Electrical Electronic and Computer Science Universidad Nacional de Colombia. Cra. 27 No. 64-60 Manizales Colombia Institute of Industrial and Control Engineering Technical University of Catalonia Avda. Diagonal 647 pl 11 08027 Barcelona Spain Department of Systems Engineering Automatics and Industrial Informatics (ESAII) Technical University of Catalonia Rambla Sant Nebridi 10 planta 1 Ed TR-11 08222 Terrasa Spain Department of Applied Mathematics 4 Technical University of Catalonia Avda. Vctor Balaguer s/n E-08800 Vilanova i la Geltru Spain

in this paper a new design for controlling dynamical systems has been applied to buck converters driven with a PWM centered pulse and (Zero Average Dynamics) ZAD-strategy. Chaotic operation has been stabilized with the so-called Fixed Point induced Control (FPiC) technique. Also, the same converter with delay whose 1-periodic orbit is always unstable, has been stabilized. Simulations are compared with the TDAS stabilization technique. Once a 1-periodic orbit has been stabilized, the dynamics shows the same characteristics and advantages of the ZAD design, such as robustness, fixed switching frequency (with zero average on the sliding surface) and a low output error.

关键词： Chaos Control Theory Converters Nonlinear Control Stabilization methods

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Management of metadata in linguistic fieldwork: Experience from the ACLA project 4

Management of metadata in linguistic fieldwork: Experience f...

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4th international Conference on Language Resources and Evaluation, LREC 2004

作者： Hughes, Baden Penton, David Bird, Steven Bow, Catherine Wigglesworth, Gillian McConvell, Patrick Simpson, Jane Department of Computer Science and Software Engineering University of Melbourne Australia Department of Linguistics and Applied Linguistics University of Melbourne Australia Australian Institute of Aboriginal and Torres Strait Islander Studies Australia Department of Linguistics University of Sydney Australia

ISBN: (纸本)2951740816

Many linguistic research projects collect large amounts of multimodal data in digital formats. Despite the plethora of data collection applications available, it is often difficult for researchers to identify and integrate applications which enable the management of collections of multimodal data in addition to facilitating the actual collection process itself. in research projects that involve substantial data analysis, data management becomes a critical issue. Whilst best practice recommendations in regard to data formats themselves are propagated through projects such as EMELD, HRELP and DOBES, there is little corresponding information available regarding best practice for field metadata management beyond the provision of standards by entities such as OLAC and iMDi. These general problems are further exacerbated in the context of multiple researchers in geographically-disparate or connectivity-challenged locations. We describe the design of a solution for a group of researchers collecting data on child language acquisition in Australian indigenous communities. We describe the context, identify pertinent issues, outline the mechanics of a solution, and finally report the implementation. in doing so, we provide an alternative model and an open source software application suite which aims to be sufficiently general that other research groups may consider adopting some or all of the infrastructure.

关键词： Linguistics

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Assertions in object oriented software maintenance: analysis and case study

Assertions in object oriented software maintenance: analysis...

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international Conference on software Maintenance (iCSM)

作者： M. Satpathy N.T. Siebel D. Rodriguez Applied Software Engineering Group Department of Computer Science University of Reading Reading UK COGNITIVE Systems Group Institute of Computer Science and Applied Mathematics Christian-Albrechts University Kiel Germany

Assertions had their origin in program verification. For the systems developed in industry, construction of assertions and their use in showing program correctness is a near-impossible task. However, they can be used to show that some key properties are satisfied during program execution. We first present a survey of the special roles that assertions can play in object oriented software construction. We then analyse such assertions by relating them to the case study of an automatic surveillance system. in particular, we address the following two issues: What types of assertions can be used most effectively in the context of object oriented software? How can you discover them and where should they be placed? During maintenance, both the design and the software are continuously changed. These changes can mean that the original assertions, if present, are no longer valid for the new software. Can we automatically derive assertions for the changed software?.

关键词： software maintenance computer aided software engineering

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Managing secure survivable critical infrastructures to avoid vulnerabilities

Managing secure survivable critical infrastructures to avoid...

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iEEE international Symposim on High Assurance Systems engineering

作者： F. Sheldon T. Potok A. Loebl A. Krings P. Oman Applied Software Engineering Research Oak Ridge National Laboratory Oak Ridge TN USA Department of Computer Science University of Idaho Moscow ID USA

information systems now form the backbone of nearly every government and private system - from targeting weapons to conducting financial transactions. increasingly these systems are networked together allowing for distributed operations, sharing of databases, and redundant capability. Ensuring these networks are secure, robust, and reliable is critical for the strategic and economic well being of the Nation. The blackout of August 14, 2003 affected 8 states and fifty million people and could cost up to $5 billion. The DOE/NERC interim reports indicate the outage progressed as a chain of relatively minor events consistent with previous cascading outages caused by a domino reaction. The increasing use of embedded distributed systems to manage and control our technologically complex society makes knowing the vulnerability of such systems essential to improving their intrinsic reliability/survivability. Our discussion employs the power transmission grid.

关键词： Management information systems Spine Government Weapons Distributed databases Transaction databases Robustness Power generation economics Costs US Department of Energy

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Ten years of genetic fuzzy systems: Current framework and new trends

Ten years of genetic fuzzy systems: Current framework and ne...

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作者： Cordón, O. Gomide, F. Herrera, F. Hoffmann, F. Magdalena, L. Department of Computer Science University of Granada 18071 Granada Spain Department of Computer Engineering FEEC State University of Campinas SP 13083-970 Brazil Royal Institute of Technology Center for Autonomous Systems S-10044 Stockholm Sweden Department of Applied Mathematics E.T.S.I. Telecomunicación Politechnic University of Madrid 28040 Madrid Spain

Fuzzy systems have demonstrated their ability to solve different kinds of problems in various application domains. Currently, there is an increasing interest to augment fuzzy systems with learning and adaptation capabilities. Two of the most successful approaches to hybridise fuzzy systems with learning and adaptation methods have been made in the realm of soft computing. Neural fuzzy systems and genetic fuzzy systems hybridise the approximate reasoning method of fuzzy systems with the learning capabilities of neural networks and evolutionary algorithms. The objective of this paper is to provide an account of genetic fuzzy systems, with special attention to genetic fuzzy rule-based systems. After a brief introduction to models and applications of genetic fuzzy systems, the field is overviewed, new trends are identified, a critical evaluation of genetic fuzzy systems for fuzzy knowledge extraction is elaborated, and open questions that remain to be addressed in the future are raised. The paper also includes some of the key references required to quickly access implementation details of genetic fuzzy systems. © 2003 Elsevier B.V. All rights reserved.

关键词： Fuzzy sets

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Modeling Demand for inventory Management of Slow-Moving items in Case of Reporting Errors

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iFAC Proceedings Volumes 2004年第4期37卷 27-32页

作者： Alexandre Dolgui Anatoly Pashkevich Maxim Pashkevich Scientific Methods for Industrial Management Dept. (MSGI) Industrial Engineering and Computer Sciences Center (G2I) Ecole de Mines de Saint Etienne 158 Cours Fauriel 42023 Saint Etienne France Robotic Laboratory Department of Automatic Control Belarusian State University of Informatics and Radioelectronics 6 P.Brovka St. Minsk 220027 Belarus Department of Mathematical Modeling and Data Analysis Faculty of Applied Mathematics and Computer Science Belarusian State University Skarina Av. 4 Minsk 220050 Belarus

The paper is devoted to the problem of modeling demand for inventory management of slow-moving items in the case of reporting errors. it is proposed a generalization of the beta-binomial demand model that takes into account possible reporting errors in the learning sample. For the new model, there are developed identification and forecasting algorithms that provide consistent estimators of the model parameters and mean square optimal forecasts. The efficiency of the proposed approach is illustrated by an application example for slow-moving car parts.

关键词： inventory control error correction statistical inference parameter estimation prediction methods

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MiraQA: initial experiments in question answering

MiraQA: Initial experiments in question answering

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2004 Cross Language Evaluation Forum Workshop, CLEF 2004, co-located with the 8th European Conference on Digital Libraries, ECDL 2004

作者： De Pablo, C. Martínez-Fernández, J.L. Martínez, P. Villena, J. García-Serrano, A.M. Goñi, J.M. González, J.C. Advanced Databases Group Computer Science Department Universidad Carlos III de Madrid Avda. Universidad 30 Leganés Madrid28911 Spain Artificial Intelligence Department Universidad Politécnica de Madrid Campus de Montegancedo s/n Boadilla del Monte28660 Spain Department of Telematic Engineering Universidad Carlos III de Madrid Avda. Universidad 30 Leganés Madrid28911 Spain DAEDALUS - Data Decisiond and Language S.A. Centro de Empresas la Arboleda Ctra. N-III km. 7 300 Madrid28031 Spain Department of Mathematics Applied to Information Techmologies E.T.S.I. Telecomunicación Universidad Politécnica de Madrid Avda. Ciudad Universitaria s/n Madrid28040 Spain

We present the miraQA system that constitutes MiRACLE first experience in Question Answering for monolingual Spanish and has been developed for QA@CLEF 2004. The architecture of the system is described and details of our approach to Statistical Answer Extraction based on Hidden Markov Models are presented. One run that uses last year question set for training purposes has been submitted. The results are presented together with ideas for improvement.

关键词： Hidden Markov models

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A tool for understanding multi-language program dependencies 11

A tool for understanding multi-language program dependencies

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11th iEEE international Workshop on Program Comprehension, iWPC 2003

作者： Linos, P.K. Chen, Zhi-Hong Berrier, S. O'Rourke, B. Butler University Center for Applied Software Engineering Research Department of Computer Science and Software Engineering IndianapolisIN46208 United States

ISBN: (纸本)0769518834

This paper describes a prototype tool that facilitates the process of understanding and managing multi-language program dependencies. More specifically, the software tool maintains a repository of host-to-foreign language dependencies between C/C++ and Java code. We describe some program comprehension features of the tool and we discuss a preliminary case study performed in order to verify its functionality and validate its usefulness. Based on the results of this study, we continue improving the tool. © 2003 iEEE.

关键词： C++ (programming language)

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