First Author:   Cornel Oros University of Poitiers cornel.oros@univ-poitiers.fr   IRIAF, 11 rue Archimède Niort, 79000, FRANCE       http://iriaf.univ-poitiers.fr/ Second Author: Cornel Oros University of Poitiers cornel.oros@univ-poitiers.fr   11, rue Archimède, 11, rue Archimède Niort, 79000, France