Sigeru Omatu, Osaka Institute of Technology, Osaka, JapanSigeru Omatu, Osaka Institute of Technology, Osaka Prefecture, University Faculty of EngineeringOmiya 5-16-1 535-8585, Osaka 27 Japan. Sara Rodríguez Universidad de Salamanca , Salamanca, SpainSara Rodríguez, Dept. of Computer Sci.& Automation Cont. University of SalamancaPlaza de la Merced S/N 37008 Salamanca, Spain. Gabriel Villarrubia, Universidad de Salamanca, Salamanca, SpainGabriel Villarrubia, Universidad de Salamanca, Departamento de Informática y Automática Calle Espejo s/n 37007. Salamanca. Spain. Pedro Faria GECAD - Instituto Superior de Engenharia do Porto, Porto, PortugalPedro Faria GECAD - Instituto Superior de Engenharia, R. Dr. António, Bernardino de Almeida, 4314200-072 Porto, Portugal Pawel Sitek, Kielce University of Technology, Faculty of Electrical Engineering and Computer Science, Kielce, PolandPawel Sitek, Kielce Univ Tech, Fac of Electrical Engg, Dept of Control & Management, Al.1000-PP 7 25-314 Kielce, Poland.