1. Research Assistant, Dept. of Mechanical Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
2. Chair Professor, Dept. of Mechanical Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
3. Professor, Laboratoire de Mécanique et Technologie, ENS Cachan/CNRS/Université Paris 6, 61 Avenue du Président Wilson, 94235 Cachan Cedex, France.