1. Full Professor, Dept. of Architecture, Graduate School of Engineering, Kobe Univ., 1-1 Rokkodaicho, Nada, Kobe, Hyōgo Prefecture 657-0013, Japan.
2. Associate Professor, International Advanced Science and Technology Research Organization (IROAST), Kumamoto Univ., Kumamoto 860-8555, Japan; Adjunct Professor, Ecole Centrale de Lyon, CNRS, École Nationale d’Ingénieurs de Saint-Etienne (ENISE), ENTPE, Laboratoire de Tribologie et de Dynamique des Systèmes (LTDS), Univ. Lyon, UMR 5513, 58 Rue Jean Parot, 42023 Saint-Etienne Cedex 2, France (corresponding author). ORCID: .