1. Department of Mechanical Engineering; Sun Moon University; Chungnam 336-708 South Korea
2. School of Mechanical Engineering; Kyungpook National University; Daegu 702-701 South Korea
3. Mbrosia Co., Ltd.; Chungnam 336-708 South Korea
4. Department of Civil Engineering and Mechanics; Sichuan University; Chengdu 610065 China
5. Department of Mechanics and Engineering Science; Sichuan University; Chengdu 610065 China