Department of Library and Information Science, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, Republic of Korea.|Department of Library and Information Science, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, Republic of Korea.|Department of Library and Information Science, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, Republic of Korea. min.song@yonsei.ac.kr.|Department of Creative IT Engineering, POSTECH, 77 Cheongam-ro Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea.