1. Scientist, Dept. of New Materials Research and Development, China Steel Corporation, No. 1 Chung Kung Rd., Kaohsiung 81233, Taiwan.
2. Engineer, Dept. of New Materials Research and Development, China Steel Corporation, No. 1 Chung Kung Rd., Kaohsiung 81233, Taiwan.
3. Assistant Professor, Dept. of Safety, Health and Environmental Engineering, Ming Chi Univ. of Technology, No. 84 Gungjuan Rd., Taishan, New Taipei City 24301, Taiwan (corresponding author).