1. Department of Electrical-Electronics Engineering, Graduate School of Natural and Applied Sciences, Gazi University, Ankara 06560, Turkey
2. Department of Computer Engineering, TED University, Ankara 06420, Turkey
3. Department of Information Engineering, University of Padova, 35131 Padova, Italy
4. Department of Computer Engineering, College of Computer and Information Sciences, King Saud University, P.O. Box 51178, Riyadh 11543, Saudi Arabia