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Phone/Fax : +54 0297 4854888Abstron: I n evolutionary algorithms based on genetics, the crossover operation creates individuals by exchange of genes. Seleclion mechanisms propitiate reproduction of better individuals imposing P direction on the search process: copier of better individuals replace worst ones. Consequently, part of the genetic material contained in these worst individuals vanisher forever. This loss of divemi@ can lead to B premature convergence. To prevent an early convergence to a local optimum under the same selection mechanism then, either a larger population sue or adequate genetic operators m e needed. Multirecombination daws multiple crossover operations on two or more parents each time a new individual is created.I n this work we show the influence on genetic diversity, quality of ICEUIS and required computational effort, when applying different crossover methods to a set of hard instances, selected as a test case, ofthe weighted tardiness scheduling problem in Single machine environments under multire-combined approaches. A description of the multirecombination variant used, experiments and preliminary results me reported. 0-7803-85 15-2/04/$20.00 0 2 0 0 4 IEEE

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In the Laboratorio de Tecnologías Emergentes (LabTEm) of the UNPA we are working in "Administration of Intelligent Buildings, by Multi-agents Systems". One of the concerns that affect the people at the moment is the security and protection of their ownership such as the possibility of being recognized by the environment. The objective of this work is to approach the problem that emerge starting from the identification of people that they have access to an office or building, using a Multi-agent system. With this system we pretend to guarantee the protection of all their properties, tangible and intangible, likewise the control and verification of entry and departure through the generation of reports and the maintenance of historical data of all the transactions carried out by the users, providing autonomy to the people by an identification code that they have.Keyword: Intelligent Buildings, Control and Verification, Multi-agents Systems ResumenEn el marco del Laboratorio de Tecnologías Emergentes (LabTEm), de la UNPA se esta trabajando en la "Administración de Edificios Inteligentes, mediante Sistemas Multiagentes". Una de las preocupaciones que afectan actualmente al hombre, es la seguridad y la protección de sus pertenencias, como así también la posibilidad de ser reconocido por el ambiente. El objetivo de este trabajo es abordar la problemática que surge a partir de la identificación de las personas que tienen acceso a una oficina o edificio, utilizando un sistema Multi-agente. Con este sistema se pretende garantizar la protección de todos sus bienes, tangibles e intangibles, como así también el control y verificación de ingresos y egresos a través de la generación de reportes y el mantenimiento de datos históricos de todas las transacciones llevadas a cabo por los usuarios, brindando autonomía a los individuos mediante el código de identificación que poseen.