Junghee Cho¹, Young-Kyu Kim¹, Jae-Hun Kim², Jun-Chul Mun³, Jae-Hyung Lee², Choi Jangsuk² and Jong-Youn Yun⁴, (1)National Radio Research Agency, Naju-si, South Korea, (2)Korean Space Weather Center, Jeju-Si, Korea, Republic of (South), (3)National Radio Research Agency, Jeju-si, South Korea, (4)National Radio Research Agency, Jeju, South Korea