1. L.E.B and L.E.A University of Batna 2,Algeria
2. L.E.A University of Batna2,Department of electronics,Algeria
3. Centre of welding and control C.S.C,Algiers,Algeria
4. University of Picardie Jules Verne LPMC,Amiens,France
5. ISTA, L.E.A, University of Batna2,Algeria