1TEI of Piraeus, Department of Electronic Computer Systems Engineering, Petrou Ralli & Thivon 250, GR-12244 Aigaleo, Greece, E-mail: dniko@teipir.gr
2Brunel University, Department of Engineering and Design, Kingston Lane, Uxbridge, Middlesex UB8 3PH, London, UK, E-mail: dniko@teipir.gr
3University of Athens, Medical School, Department of Medical Physics, Mikras Asias 75, GR-11527 Athens, Greece, E-mail: dniko@teipir.gr
4Technological Educational Institute (TEI) of Ionian Islands, Department of Environmental Technology, Neo Ktirio, Panagoula 29100, Zakynthos, Greece, E-mail: dniko@teipir.gr
*Corresponding Author:
Dimitrios Nikolopoulos, TEI of Piraeus, Department of Electronic Computer Systems Engineering, Petrou Ralli & Thivon 250, GR-12244 Aigaleo, Greece, Fax: +0030-210-5381436 Email: ,