Affiliation: | 1. Department of Mechanical Engineering, Chosun University, 375, Seosuk-dong, Dong-gu, 501-759, Kwangju, Korea 2. School of Mechanical Engineering, Chonbuk National University, Chonju, Korea 3. Graduate school, Departmentn of Mechanical Design, Chonbuk national University, Chonju, Korea
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