1. Normal Superior School, Sidi Mohammed Ben Abdellah University,LIPI,Fes-Morocco
2. University of Santiago,Department of Electrical Engineering,Chile
3. ENSA-Khouribga, Soultan Moulay Slimane University,LASTI,Morocco
4. Universidad de Valladolid,Departamen to de Ingenieria de Sistemas y Automatica,Valladolid,Spain,47005