I am Dr. József Polák, associate professor at the Department of Road and Railway Vehicles of Széchenyi István University in Győr and research engineer at the Vehicle Research Centre. My research interests are in the field of optimization analysis of electric road vehicle powertrains, in which I deal with gear losses and their mathematical modelling. My main areas of teaching are vehicle maintenance repair, overlay welding and bonding technologies, technological sizing of repair workshops and technical diagnostics.