1. International Hellenic University,Information and Electronic Engineering,Sindos,Greece
2. University of Ioannina,Information and Telecommunications,Arta,Greece
3. ELEDIA@AUTh, School of Physics, Aristotle University of Thessaloniki,Thessaloniki,Greece
4. ELEDIA@AUTh, Information and Electronic Engineering, International Hellenic University,Sindos,Greece