1. 1 Faculty of Materials Engineering and Mechanics University Valahia of Targoviste Targoviste , Romania
2. 2 SC CERTIO SRL Bucharest , Romania
3. 3 Corneliu Faculty of Electrical Engineering, Electronics and InformationTechnology University Valahia of Targoviste Targoviste , Romania
4. 4 eMotion Research Center University Valahia of Targoviște , Târgoviște , Romania
5. 5 Faculty of Electrical Engineering, Electronics and Information Technology , University Valahia of Targoviste Targoviste , Romania
6. 6 eMotion Research Center University Valahia of Targoviște Târgoviște , Romania