1. Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
2. Department of Mechatronic Engineering, National Taiwan Normal University, 162, Sec. 1, Ho-Ping E. Road, Taipei 106, Taiwan
3. Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan