1. Université Mouloud Mammeri,Laboratoire des Technologies Avancées du Génie Electrique (LATAGE),Tizi-Ouzou,Algeria
2. Istanbul University-Cerrahpaça,Engineering Faculty,Istanbul,Turkey
3. Université Badji Mokhtar,Laboratoire des Semi-conducteurs,Annaba,Algeria,23000
4. Cardiff University,Advanced High Voltage Engineering Research Centre,United Kingdom