1. Grad. Student, Dept. of Chem. Engrg., Hanyang Univ., Seoul, 133-791, South Korea.
2. Res., Dept. of Chem. Engrg., Hanyang Univ., Seoul, 133-791, South Korea.
3. Prof., Dept. of Civ. Engrg., Hanyang Univ., Seoul, 133-791, South Korea.
4. Prof., Dept. of Chem. Engrg., Hanyang Univ., Seoul, 133-791, South Korea. E-mail: ykyeo@email.hanyang.ac.kr