Jong-Hak Woo(Department of Physics & Astronomy, Seoul National University, Seoul 08826, Republic of Korea)
Hojin Cho(Department of Physics & Astronomy, Seoul National University, Seoul 08826, Republic of Korea)
Sumin Seung(Department of Physics & Astronomy, Seoul National University, Seoul 08826, Republic of Korea, Department of Earth Science Education, Seoul National University, Seoul 08826, Republic of Korea)