1. Graduate School of Science and Engineering, Kagoshima University , 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065 , Japan
2. National Astronomical Research Institute of Thailand (Public Organization) , 260 Moo 4, T. Donkaew, A. Maerim, Chiang Mai 50180 , Thailand
3. Korea Astronomy & Space Science Institute , 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055 , Republic of Korea
4. Teikyo University of Science , 2-2-1 Senju-Sakuragi, Adachi-ku, Tokyo 120-0045 , Japan
5. Gifu University , 1-1 Yanagido, Gifu, Gifu 501-1193 , Japan
6. Joint Institute for VLBI ERIC (JIVE) , Oude Hoogeveensedijk 4, 7991 PD, Dwingeloo , the Netherlands
7. Mizusawa VLBI Observatory, National Astronomical Observatory of Japan , 2-12 Hoshi-ga-oka, Mizusawa-ku, Oshu, Iwate 023-0861 , Japan
8. Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI) , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan