Affiliation: | 1. Dept. Automotive Engng., Seoul Nat’l. Univ. Sci. Technol., Nowon-gu, Seoul, 139-743, Korea 2. Dept. Mech. System Design Engng., Seoul Nat’l. Univ. Sci. Technol., Nowon-gu, Seoul, 139-743, Korea 3. Dept. Mech. and Automotive Engng., Seoul Nat’l. Univ. Sci. Technol., Nowon-gu, Seoul, 139-743, Korea
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