Jung-Hwi Kihm, Jungwon University, Department of Renewable Energy and Resources, Goesan-Gun, Korea, Republic of (South), Jai-Yong Park, Chungnam National University, Department of Geological Sciences, Daejeon, South Korea, Sungho Lee, Seoul National University, School of Earth and Environmental Sciences, Seoul, South Korea and Jun-Mo Kim, GeoLab, Seoul, South Korea