1. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive
1, Block EA, 07-08, Singapore 117576
2. School of Mechanical and Aerospace
Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
3. Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan