<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2005000500001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Identificación del sistema de Rössler: enfoque algebraico y algoritmos genéticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar Ibáñez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez H.]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez C.]]></surname>
<given-names><![CDATA[M.S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores A.]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garrido M.]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez G.]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación en Computación ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados Departamento de Control Automático]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>51</volume>
<numero>5</numero>
<fpage>437</fpage>
<lpage>441</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2005000500001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2005000500001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2005000500001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo se presenta un método para determinar los parámetros del atractor de Rössler de forma muy aproximada, por medio de la observación de una variable disponible. Se demuestra que el sistema es algebraicamente observable e identificable con respecto a la salida elegida. Este hecho permite construir una parametrización diferencial de la salida y de sus respectivas derivadas. A partir de esta parametrización, se establece un esquema de identificación basado en el método de mínimos cuadrados y la solución es encontrada por un algoritmo genético.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This article presents a method to determine the parameters of Rössler's attractor in a very approximated way, by means of observations of an available variable. It is shown that the system is observable and identifiable algebraically with respect to the chosen output. This fact allows to construct a differential parametrization of the output and its derivatives. Using this parametrization an identification scheme based on least mean squares is established and the solution is found with a genetic algorithm.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sistemas caóticos]]></kwd>
<kwd lng="es"><![CDATA[problema inverso]]></kwd>
<kwd lng="es"><![CDATA[estimación de parámetros y estados]]></kwd>
<kwd lng="en"><![CDATA[Chaotic systems]]></kwd>
<kwd lng="en"><![CDATA[inverts problem]]></kwd>
<kwd lng="en"><![CDATA[parameters and states estimation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Carta</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Identificaci&oacute;n del sistema de R&ouml;ssler: enfoque algebraico y algoritmos gen&eacute;ticos</b></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>C. Aguilar Ib&aacute;&ntilde;ez<sup>a</sup>, J. S&aacute;nchez H.<sup>a</sup>, M.S. Su&aacute;rez C.<sup>a</sup>, F. Flores A.<sup>a</sup>, R. Garrido M.<sup>b</sup> y R. Mart&iacute;nez G.<sup>b</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>a</sup></i> <i>CIC&#45;IPN, Av. Juan de Dios B&aacute;tiz s/n Esq. Manuel Oth&oacute;n de M. Unidad Profesional Adolfo L&oacute;pez Mateos, Col. Nueva Industrial Vallejo, M&eacute;xico, D.F., 07700, M&eacute;xico e&#45;mail:</i> <a href="mailto:caguilar@cic.ipn.mx">caguilar@cic.ipn.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup></i> <i>CINVESTAV&#45;IPN, Departamento de Control Autom&aacute;tico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 25 de mayo de 2004.    <br> 	Aceptado el 7 de julio de 2005.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En este art&iacute;culo se presenta un m&eacute;todo para determinar los par&aacute;metros del atractor de R&ouml;ssler de forma muy aproximada, por medio de la observaci&oacute;n de una variable disponible. Se demuestra que el sistema es algebraicamente observable e identificable con respecto a la salida elegida. Este hecho permite construir una parametrizaci&oacute;n diferencial de la salida y de sus respectivas derivadas. A partir de esta parametrizaci&oacute;n, se establece un esquema de identificaci&oacute;n basado en el m&eacute;todo de m&iacute;nimos cuadrados y la soluci&oacute;n es encontrada por un algoritmo gen&eacute;tico.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Sistemas ca&oacute;ticos; problema inverso; estimaci&oacute;n de par&aacute;metros y estados.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">This article presents a method to determine the parameters of R&ouml;ssler's attractor in a very approximated way, by means of observations of an available variable. It is shown that the system is observable and identifiable algebraically with respect to the chosen output. This fact allows to construct a differential parametrization of the output and its derivatives. Using this parametrization an identification scheme based on least mean squares is established and the solution is found with a genetic algorithm.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Chaotic systems; inverts problem; parameters and states estimation.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 05.45.Gg; 05.45.Pq; 05.45.Xt</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v51n5/v51n5a1.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. K.T. Alligood, T.D. Sauer y J.A. Yorke, <i>Chaos: An Introduction to Dynamical Systems</i> (Springer&#45;Verlag, New York, 1997).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8312681&pid=S0035-001X200500050000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. D. Hand y M. Berthold, <i>Intelligent Data Analysis: An introduction,</i> 2nd edition (Springer&#45;Verlag, 2002).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8312683&pid=S0035-001X200500050000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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