[1] Seoul Natl Univ Tech, Dept Chem Engn, Seoul, South Korea
[2] Korea Univ, Coll Med, Dept Biomed Engn, Seoul, South Korea
[3] Seoul Natl Univ, Coll Dent, Dept Oral & Maxillofacial Surg, Seoul 151, South Korea
[4] Seoul Natl Univ, Dept Elect & Informat, Seoul, South Korea