5Th Ifac Conference on System Structure and Control 1998 (Ssc 98), Date: JUL 08-10, 1998, Location: NANTES, FRANCE, Sponsors: Int Federat Automat Control, Tech Comm Linear Syst, Atlantech, Chambres Commerce & Ind Nantes & St Nazaire, Conseil Gen Loire Atlantique, DGA, Ecole Cent Nantes, Mairie Nantes, MENRT, IFAC Tech Comm Nonlinear Syst, Inst Rech Cybernet Nantes, Lab Automat Grenoble