1. Department of Mechanical Engineering, Sogang University, Seoul 04107, South Korea
2. Dipartimento di Ingegneria, Università degli Studi di Palermo, Viale delle Scienze ed. 6, 90128 Palermo, Italy
3. Department of Civil and Environmental Engineering,Yonsei University, Seoul 03722, South Korea
4. Department of Mechanical Engineering, University of Alberta, Edmonton T6G 1H9, Canada