Shaojia Ge, Nanjing University of Science and Technology, China; Erkki Tomppo, Aalto University, Finland; Yrjö Rauste, VTT Technical Research Centre of Finland, Finland; Weimin Su, Hong Gu, Nanjing University of Science and Technology, China; Jaan Praks, Aalto University, Finland; Oleg Antropov, VTT Technical Research Centre of Finland, Finland