Boris X. Vintimilla Burgos 
Institute of Organization and Control of Industrial Systems
Polytechnic University of Catalonia
Av. Diagonal 647, 11va. planta, Office 11-32
08028 - Barcelona - SPAIN
Tel: +34 93 401 6658
Fax: +34 93 401 6605
Email: vintimi@ioc.upc.es