Affiliation: | aSchool of Mechanical and Automotive Engineering, Catholic University of Daegu, Hayang-Eup, Kyungsan, Kyungbuk, 712-702, South Korea;bCenter for EAPap Actuator, Department of Mechanical Engineering, Inha University, 253 Yonghyun-Dong, Nam-Ku, Incheon 402-751, South Korea |