[1] Sookmyung Womens Univ, Dept Phys, Seoul 140742, South Korea
[2] Trinity Coll Dublin, Sch Phys, CRANN, Dublin, Ireland
[3] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea
[4] Sejong Univ, Seoul 143747, South Korea
[5] Sangji Univ, Dept Oriental Biomed Engn, Wonju 220702, South Korea
[6] Korean Inst Ind Technol, Div Prod Tech, Intzeon 406130, South Korea