1. University of Macedonia,Department of Applied Informatics,Thessaloniki,Greece
2. University of Western Macedonia,Department of Business Administration,Grevena,Greece
3. University of Western Macedonia,Department of Informatics and Telecommunications Engineering,Kozani,Greece
4. School of Physics, Aristotle University of Thessaloniki,Thessaloniki,Greece
5. Graduate School of Engineering, Nagoya Institute of Technology,Nagoya,Japan