1. Environmental Technology Research Center; Korea Institute of Science and Technology; 131 Cheongryang Seoul Korea
2. Department of Chemistry; Korea University; 145, Anam-ro Seongbuk-gu Seoul Korea
3. Forensic Science Division in Supreme Prosecution Service; Document Examination Section of National Digital Forensic Center; 157 Banpo-daero Seocho-gu Seoul Korea
4. Kyunghee Univirsity; Hoegi-dong Dongdaemun-gu Seoul Korea