Taisuke Fujita is Associate Professor at Nagasaki University, Japan.

Hidehiro Yamamoto is Professor in the Institute of Humanities and Social Sciences at the University of Tsukuba, Japan.

Youngho Cho is Professor in Political Science at Sogang University in Seoul, South Korea.

Sang-Jin Han is Professor Emeritus at Seoul National University, South Korea.

Yida Zhai is Associate Professor of Political Science at the University of Tsukuba, Japan.