About the Authors

Koichi Ogawara

ogawara@sys.wakayama-u.ac.jp

Affiliation Faculty of Systems Engineering, Wakayama University, Wakayama-shi, Wakayama, Japan

Masahiro Fukutomi

Affiliation Graduate School of Information Science and Electrical Engineering, Kyushu University, Nishi-ku, Fukuoka, Japan

Seiichi Uchida

Affiliation Faculty of Information Science and Electrical Engineering, Kyushu University, Nishi-ku, Fukuoka, Japan

Yaokai Feng

Affiliation Faculty of Information Science and Electrical Engineering, Kyushu University, Nishi-ku, Fukuoka, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KO MF SU YF. Performed the experiments: KO MF. Analyzed the data: KO MF SU YF. Contributed reagents/materials/analysis tools: KO MF SU YF. Wrote the paper: KO MF SU YF.