<?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>S1405-55462008000400007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On Multicriteria Mixed Integer Linear Programming Based Tools for Location Problems-An Updated Critical Overview Illustrated with a Bicriteria DSS]]></article-title>
<article-title xml:lang="es"><![CDATA[Herramientas Multicriterio Lineales Enteras Mixtas para Problemas de Localización - Una Revisión Crítica Actualizada Ilustrada con un SAD Bicriterio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Captivo]]></surname>
<given-names><![CDATA[Maria Eugénia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Namorado Clímaco]]></surname>
<given-names><![CDATA[João]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Ciências Centro de Investigação Operacional]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>PORTUGAL</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade de Coimbra Faculdade de Economia ]]></institution>
<addr-line><![CDATA[Coimbra ]]></addr-line>
<country>PORTUGAL</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>12</volume>
<numero>2</numero>
<fpage>216</fpage>
<lpage>231</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-55462008000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-55462008000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-55462008000400007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Location problems are, in general, multidimensional in nature, particularly if sustainable development planning is required. So, multicriteria approaches seem adequate in many situations. Nevertheless, only a very small percentage of the publications in this area concern multicriteria models or tools. Generally, the different criteria are formulated as constraints imposing some minimum or maximum value, or are addressed by a surrogate criterion (like distance) on a single objective structure. In this paper we outline the more relevant multicriteria mixed-integer location models and approaches taking into account several issues. The adequacy of the available models to reality is discussed. We also put in evidence the importance of interactive approaches, namely, discussing a decision support tool in which we are co-authors.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los problemas de localización son, en general, multidimensionales, sobre todo cuando se pretende desarrollar una planificación sostenible. De esta forma, los enfoques multicriterio son adecuados en muchas situaciones prácticas. Sin embargo, solo un pequeño porcentaje de publicaciones de esta área se focalizan en modelos o técnicas multicriterio. En general, los diferentes criterios son introducidos en el modelo como restricciones que imponen algún valor máximo o mínimo, o que son enfocadas por un criterio sustituto (por ejemplo una distancia) en una estructura de apenas una función objetivo. En este trabajo, hacemos una revisión de los modelos mixtos de localización multicriterio más importantes, así como de las técnicas que consideran algunas cuestiones importantes. También se evalúa la adecuación de los modelos existentes a la realidad. Destacamos la importancia de los planteamientos interactivos, en particular discutimos una herramienta de soporte a la decisión de la cual también somos autores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Multicriteria Location]]></kwd>
<kwd lng="en"><![CDATA[Mixed Integer Linear Programming]]></kwd>
<kwd lng="en"><![CDATA[Interactive Approaches]]></kwd>
<kwd lng="en"><![CDATA[Decision Support Systems]]></kwd>
<kwd lng="es"><![CDATA[Localización Multicriterio]]></kwd>
<kwd lng="es"><![CDATA[Programación Lineal Entera Mixta]]></kwd>
<kwd lng="es"><![CDATA[Aproximaciones Interactivas]]></kwd>
<kwd lng="es"><![CDATA[Sistemas de Apoyo para la Toma de Decisiones]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>On Multicriteria Mixed Integer Linear Programming Based Tools for Location Problems&#150;An Updated Critical Overview Illustrated with a Bicriteria DSS</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b><i>Herramientas Multicriterio Lineales Enteras Mixtas para Problemas de Localizaci&oacute;n &#150; Una Revisi&oacute;n Cr&iacute;tica Actualizada Ilustrada con un SAD Bicriterio</i></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Maria Eug&eacute;nia Captivo<sup>1</sup> and Jo&atilde;o Namorado Cl&iacute;maco<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>1</sup> <i>Universidade de Lisboa, Faculdade de Ci&ecirc;ncias and Centro de Investiga&ccedil;&atilde;o Operacional, Campo Grande, Bloco C6, Piso 4, 1749&#150;016 Lisboa, PORTUGAL e&#150;mail: <a href="mailto:mecaptivo@fc.ul.pt">mecaptivo@fc.ul.pt</a></i></font></p>     <p align="justify"><font face="verdana" size="2"><sup>2</sup> <i>Faculdade de Economia and INESC &#150; Coimbra, Universidade de Coimbra, Av. Dias da Silva, 3004&#150;512 Coimbra, PORTUGAL e&#150;mail: <a href="mailto:jclimaco@fe.uc.pt">jclimaco@fe.uc.pt</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Article received on April 05, 2008    ]]></body>
<body><![CDATA[<br> Accepted on August 12, 2008</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">Location problems are, in general, multidimensional in nature, particularly if sustainable development planning is required. So, multicriteria approaches seem adequate in many situations. Nevertheless, only a very small percentage of the publications in this area concern multicriteria models or tools. Generally, the different criteria are formulated as constraints imposing some minimum or maximum value, or are addressed by a surrogate criterion (like distance) on a single objective structure.</font></p>     <p align="justify"><font face="verdana" size="2">In this paper we outline the more relevant multicriteria mixed&#150;integer location models and approaches taking into account several issues. The adequacy of the available models to reality is discussed. We also put in evidence the importance of interactive approaches, namely, discussing a decision support tool in which we are co&#150;authors.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:  </b>Multicriteria Location, Mixed Integer Linear Programming, Interactive Approaches, Decision Support Systems</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">Los problemas de localizaci&oacute;n son, en general, multidimensionales, sobre todo cuando se pretende desarrollar una planificaci&oacute;n sostenible. De esta forma, los enfoques multicriterio son adecuados en muchas situaciones pr&aacute;cticas. Sin embargo, solo un peque&ntilde;o porcentaje de publicaciones de esta &aacute;rea se focalizan en modelos o t&eacute;cnicas multicriterio.</font></p>     <p align="justify"><font face="verdana" size="2">En general, los diferentes criterios son introducidos en el modelo como restricciones que imponen alg&uacute;n valor m&aacute;ximo o m&iacute;nimo, o que son enfocadas por un criterio sustituto (por ejemplo una distancia) en una estructura de apenas una funci&oacute;n objetivo.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En este trabajo, hacemos una revisi&oacute;n de los modelos mixtos de localizaci&oacute;n multicriterio m&aacute;s importantes, as&iacute; como de las t&eacute;cnicas que consideran algunas cuestiones importantes. Tambi&eacute;n se eval&uacute;a la adecuaci&oacute;n de los modelos existentes a la realidad.   Destacamos la importancia de los planteamientos interactivos,   en particular discutimos una herramienta de soporte a la decisi&oacute;n de la cual tambi&eacute;n somos autores.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras Clave:     </b>Localizaci&oacute;n    Multicriterio,    Programaci&oacute;n    Lineal    Entera    Mixta,    Aproximaciones Interactivas, Sistemas de Apoyo para la Toma de Decisiones</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/v12n2/v12n2a7.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>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">Maria Eug&eacute;nia Captivo was partially supported by the project POCTI/ISFL&#150;1/152 and Jo&atilde;o Namorado Cl&iacute;maco was partially supported by the project POSI/ISFL&#150;13/308.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. <b>Bouyssou, D.,</b> "Modelling inaccurate determination, uncertainty, imprecision using multiple criteria". 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