<?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>1405-5546</journal-id>
<journal-title><![CDATA[Computación y Sistemas]]></journal-title>
<abbrev-journal-title><![CDATA[Comp. y Sist.]]></abbrev-journal-title>
<issn>1405-5546</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Centro de Investigación en Computación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-55462012000400008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Selección aleatoria de árboles generadores en gráficas]]></article-title>
<article-title xml:lang="en"><![CDATA[Random Selection of Spanning Trees on Grap]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Pérez]]></surname>
<given-names><![CDATA[Sergio Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Luna]]></surname>
<given-names><![CDATA[Guillermo Benito]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sagols-Troncoso]]></surname>
<given-names><![CDATA[Feliú Davino]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados Departamento de Computación]]></institution>
<addr-line><![CDATA[ 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 Matemáticas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>16</volume>
<numero>4</numero>
<fpage>457</fpage>
<lpage>469</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-55462012000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-55462012000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-55462012000400008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Existen diversos procedimientos para seleccionar aleatoriamente árboles generadores en gráficas conexas no dirigidas, con tiempos esperados de ejecución entre los órdenes y en los peores casos, donde es el número de vértices en la gráfica. En este trabajo realizamos la localización efectiva y eficiente de árboles generadores mediante paseos aleatorios sobre dichas gráficas, con la finalidad de obtener un equilibrio entre el diámetro del árbol, la valencia de los vértices internos y el número de hojas de los árboles obtenidos. Para esto, proponemos el uso de diversas matrices de transición en cadenas de Markov, considerando diferentes distribuciones de probabilidad para las vecindades de vértices involucradas en el paseo aleatorio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Random selection of spanning trees on graphs has been treated extensively in technical literature. Popular randomized algorithms have time complexity varying from to , where is the order of a graph, namely, the number of vertices. In this work, we introduce effective and efficient procedures to select spanning trees using random walks with the purpose to balance the diameter of the selected tree, the valencies of its inner vertices, and the number of leaves at its yield. We describe several ways to form transition matrices of Markov chains in terms of probability distributions on the neighborhood of any visited vertex along the random walk.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Selección aleatoria de árboles generadores]]></kwd>
<kwd lng="es"><![CDATA[paseos aleatorios sobre gráficas]]></kwd>
<kwd lng="es"><![CDATA[matrices de transición en cadenas de Markov]]></kwd>
<kwd lng="es"><![CDATA[distribuciones de probabilidad en vecindades de vértices]]></kwd>
<kwd lng="en"><![CDATA[Random spanning trees]]></kwd>
<kwd lng="en"><![CDATA[random walks on graphs]]></kwd>
<kwd lng="en"><![CDATA[transition matrices in Markov chains]]></kwd>
<kwd lng="en"><![CDATA[probability distributions on neighborhoods of vertices]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Selecci&oacute;n aleatoria de &aacute;rboles generadores en gr&aacute;ficas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Random Selection of Spanning Trees on Graphs</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Sergio Luis P&eacute;rez&#45;P&eacute;rez<sup>1</sup>, Guillermo Benito Morales&#45;Luna<sup>1</sup> y Feli&uacute; Davino Sagols&#45;Troncoso<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Departamento de Computaci&oacute;n, Centro de Investigaci&oacute;n y de Estudios Avanzados, IPN, Distrito Federal, M&eacute;xico. Corre:</i> <a href="mailto:sperez@computacion.cs.cinvestav.mx">sperez@computacion.cs.cinvestav.mx</a>, <a href="mailto:gmorales@cs.cinvestav.mx">gmorales@cs.cinvestav.mx</a></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Departamento de Matem&aacute;ticas, Centro de Investigaci&oacute;n y de Estudios Avanzados, IPN, Distrito Federal, M&eacute;xico. Correo:</i> <a href="mailto:fsagols@math.cinvestav.edu.mx">fsagols@math.cinvestav.edu.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Article received on 06/04/2011.    <br> 	Accepted on 25/02/2012.</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">Existen diversos procedimientos para seleccionar aleatoriamente &aacute;rboles generadores en gr&aacute;ficas conexas no dirigidas, con tiempos esperados de ejecuci&oacute;n entre los &oacute;rdenes y en los peores casos, donde es el n&uacute;mero de v&eacute;rtices en la gr&aacute;fica. En este trabajo realizamos la localizaci&oacute;n efectiva y eficiente de &aacute;rboles generadores mediante paseos aleatorios sobre dichas gr&aacute;ficas, con la finalidad de obtener un equilibrio entre el di&aacute;metro del &aacute;rbol, la valencia de los v&eacute;rtices internos y el n&uacute;mero de hojas de los &aacute;rboles obtenidos. Para esto, proponemos el uso de diversas matrices de transici&oacute;n en cadenas de Markov, considerando diferentes distribuciones de probabilidad para las vecindades de v&eacute;rtices involucradas en el paseo aleatorio.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Selecci&oacute;n aleatoria de &aacute;rboles generadores, paseos aleatorios sobre gr&aacute;ficas, matrices de transici&oacute;n en cadenas de Markov, distribuciones de probabilidad en vecindades de v&eacute;rtices.</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>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Random selection of spanning trees on graphs has been treated extensively in technical literature. Popular randomized algorithms have time complexity varying from to , where is the order of a graph, namely, the number of vertices. In this work, we introduce effective and efficient procedures to select spanning trees using random walks with the purpose to balance the diameter of the selected tree, the valencies of its inner vertices, and the number of leaves at its yield. We describe several ways to form transition matrices of Markov chains in terms of probability distributions on the neighborhood of any visited vertex along the random walk.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Random spanning trees, random walks on graphs, transition matrices in Markov chains, probability distributions on neighborhoods of vertices.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/cys/v16n4/v16n4a8.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"><b>1. Aldous, D.J. (1990).</b> The random walk construc&#45;tion of uniform spanning trees and uniform labelled trees. <i>SIAM Journal on Discrete Mathematics</i>, 3(4), 450&#150;465.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058539&pid=S1405-5546201200040000800001&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"><b>2. Broder, A. (1989).</b> Generating random spanning trees. <i>30th Annual Symposium on Foundations of Computer Science</i>, Research Triangle Park, North Carolina, USA, 442&#150;447.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058541&pid=S1405-5546201200040000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2"><b>3.</b> Graph coloring and its generalizations (s.f.). Retrieved from <a href="http://mat.gsia.cmu.edu/COLOR03/" target="_blank">http://mat.gsia.cmu.edu/COLOR03/</a></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058543&pid=S1405-5546201200040000800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2"><b>4. Kelner, J.A. &amp; Madry, A. (2009).</b> Faster generation of random spanning trees. <i>50th Annual IEEE Symposium on Foundations of Computer Science</i>, Atlanta, Georgia, USA, 13&#150;21.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058544&pid=S1405-5546201200040000800004&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"><b>5. Sagols, F. &amp; Morales&#45;Luna, G. (2010, 8 de septiembre).</b> Two identification protocols based on Cayley graphs of Coxeter groups. <i>Cryptology ePrint Archive.</i> Retrieved from <a href="http://eprint.iacr.org/2010/470" target="_blank">http://eprint.iacr.org/2010/470</a>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058546&pid=S1405-5546201200040000800005&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"><b>6. Wilson, D.B. (1996).</b> Generating random spanning trees more quickly than the cover time. <i>Proceedings of the twenty&#45;eighth annual ACM symposium on Theory of computing</i>, Philadelphia, Pennsylvania, USA, 296&#150;303.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2058548&pid=S1405-5546201200040000800006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
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