<?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>S0035-001X2011000300004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimador estocástico para un sistema tipo caja negra]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medel Juárez]]></surname>
<given-names><![CDATA[J. de J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parrazales]]></surname>
<given-names><![CDATA[R.U.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orozco]]></surname>
<given-names><![CDATA[R.P.]]></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 D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>3</numero>
<fpage>204</fpage>
<lpage>210</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Este artículo considera a un sistema tipo caja negra con dinámica interna desconocida. Para describirla se requiere de un estimador basado en la variable instrumental, de la matriz de transición y del identificador que es resultado de un modelo simplificado. El modelo propuesto de manera recursiva esta en espacio de estados y tiene explícitamente la ganancia interna, como el único elemento desconocido por describir. El estimador se aproxima y en el mejor de los casos, converge a una vecindad de la referencia, lo que permite ser una herramienta del identificador al usar a la matriz de transiciones de una manera analítica resolviendo el problema de convergencia del filtro. La convergencia puede observarse por el funcional recursivo del error de identificación. Como ejemplo, se desarrollo la simulación del modelo en diferencias finitas de un motor de CD requiriendo conocer que dinámica interna de operación tiene. El estimador con la variable instrumental logre) describir al parámetro para diferentes condiciones de operación y se dio seguimiento a la señal. El funcional de error para diferentes ganancias dentro de la región de estabilidad discreta, es convergente. Y la función de distribución del identificador se aproxima a la corriente directa del modelo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This paper considers a black box system with unknown internal dynamics. The estimator based on instrumental variable requires, the transition matrix used in the identifier which results in a simplified model. The recursive space state model allows an explicit internal gain which is unknown and undescribed. The recursive estimator allows knowing the internal dynamics of the black box system in an analytic manner and in the best cases, converges to a reference neighborhood, becoming a necessary identification tool solving the convergence filter problem. The convergence estimator and the identifier are seen from the recursive functional identification error. An example was developed to simulate the DC motor in a finite differences model that requires knowing the operation of internal dynamics. The instrumental variable estimator describes the different operating condition parameters and monitors the direct current signal in finite differences. The functional error to different gains in the stability discrete region converges, and approximates the distribution of the direct current model.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Procesos estocásticos]]></kwd>
<kwd lng="es"><![CDATA[estimación]]></kwd>
<kwd lng="es"><![CDATA[filtrado]]></kwd>
<kwd lng="es"><![CDATA[identificación]]></kwd>
<kwd lng="en"><![CDATA[Stochastic processes]]></kwd>
<kwd lng="en"><![CDATA[estimation]]></kwd>
<kwd lng="en"><![CDATA[filtering]]></kwd>
<kwd lng="en"><![CDATA[identification]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>Estimador estoc&aacute;stico para un sistema tipo caja negra</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>J. de J. Medel Ju&aacute;rez&ordf;, R.U. Parrazales<sup>b</sup>, R.P. Orozco<sup>c</sup></b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i>&ordf; Centro de Investigaci&oacute;n en Computaci&oacute;n del Instituto Polit&eacute;cnico Nacional, Av. Juan de Dios B&aacute;tiz s/n casi esq. Miguel Oth&oacute;n de Mendiz&aacute;bal, Unidad Profesional Adolfo L&oacute;pez Mateos, M&eacute;xico D.F. 07738, M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Centro de Investigaci&oacute;n en Computaci&oacute;n del Instituto Polit&eacute;cnico Nacional, Av. Juan de Dios B&aacute;tiz s/n casi esq. Miguel Othon de Mendizabal, Unidad Profesional Adolfo L&oacute;pez Mateos, M&eacute;xico, D.F. 07738, M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Centro de Investigaci&oacute;n en Ciencia Aplicada y Tecnolog&iacute;a Avanzada del Instituto Polit&eacute;cnico Nacional, </i><i>Legaria No. 694, M&eacute;xico D.F. 11500, M&eacute;xico.</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 3 de noviembre de 2010    <br>     Aceptado el 29 de abril de 2011</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">Este art&iacute;culo considera a un sistema tipo caja negra con din&aacute;mica interna desconocida. Para describirla se requiere de un estimador basado en la variable instrumental, de la matriz de transici&oacute;n y del identificador que es resultado de un modelo simplificado. El modelo propuesto de manera recursiva esta en espacio de estados y tiene expl&iacute;citamente la ganancia interna, como el &uacute;nico elemento desconocido por describir. El estimador se aproxima y en el mejor de los casos, converge a una vecindad de la referencia, lo que permite ser una herramienta del identificador al usar a la matriz de transiciones de una manera anal&iacute;tica resolviendo el problema de convergencia del filtro. La convergencia puede observarse por el funcional recursivo del error de identificaci&oacute;n. Como ejemplo, se desarrollo la simulaci&oacute;n del modelo en diferencias finitas de un motor de CD requiriendo conocer que din&aacute;mica interna de operaci&oacute;n tiene. El estimador con la variable instrumental logre) describir al par&aacute;metro para diferentes condiciones de operaci&oacute;n y se dio seguimiento a la se&ntilde;al. El funcional de error para diferentes ganancias dentro de la regi&oacute;n de estabilidad discreta, es convergente. Y la funci&oacute;n de distribuci&oacute;n del identificador se aproxima a la corriente directa del modelo.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Procesos estoc&aacute;sticos; estimaci&oacute;n; filtrado; identificaci&oacute;n.</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 paper considers a black box system with unknown internal dynamics. The estimator based on instrumental variable requires, the transition matrix used in the identifier which results in a simplified model. The recursive space state model allows an explicit internal gain which is unknown and undescribed. The recursive estimator allows knowing the internal dynamics of the black box system in an analytic manner and in the best cases, converges to a reference neighborhood, becoming a necessary identification tool solving the convergence filter problem. The convergence estimator and the identifier are seen from the recursive functional identification error. An example was developed to simulate the DC motor in a finite differences model that requires knowing the operation of internal dynamics. The instrumental variable estimator describes the different operating condition parameters and monitors the direct current signal in finite differences. The functional error to different gains in the stability discrete region converges, and approximates the distribution of the direct current model.</font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Stochastic processes; estimation; filtering; identification.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">PACS: 02.30.Yy; 07.50.&#150;x; 02.70.Br</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/v57n3/v57n3a4.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. J. 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