Affiliation: | 1. Centre National de la Recherche Scientifique , Laboratoire d'Analyse et d'Architecture des Systèmes , 7 Avenue du Colonel Roche, Toulouse Cedex, F-31077 , France Phone: +33-61.33.62.00 Fax: +33-61.33.62.00 E-mail: julien@Jaas.fr or babary@laas.fr;2. Department of Computer Science and Applied Mathematics , University of Kuopio , P.O.Box 1627, Kuopio, FIN-70211, Finland Phone: +358-71.16.25.71 Fax: +358-71.16.25.71 E-mail: nihtila@cs.uku.fi |