1. Ran Dong, School of Computer Science, Tokyo University of Technology, Hachioji City, Tokyo, Japan. Email: randong@stf.teu.ac.jp.
2. Dongsheng Cai, Faculty of Engineering, Information and Systems, University of Tsukuba, Tsukuba City, Ibaraki, Japan. Email: cai@cs.tsukuba.ac.jp.
3. Shingo Hayano, Faculty of Letters, Tsuru University, Tsuru City, Yamanashi, Japan. Email: hayano@tsuru.ac.jp.
4. Shinobu Nakagawa, Design Department, Osaka University of Arts, Osaka City, Osaka, Japan. Email: shinobu@osaka-geidai.ac.jp.
5. Soichiro Ikuno, School of Computer Science, Tokyo University of Technology, Hachioji City, Tokyo, Japan. Email: ikuno@stf.teu.ac.jp.