About the Authors

Kotaro Yasui

k.yasui@riec.tohoku.ac.jp

Affiliation Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi, Japan

Kazuhiko Sakai

Affiliation Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi, Japan

Takeshi Kano

Affiliation Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi, Japan

Dai Owaki

Affiliation Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi, Japan

Akio Ishiguro

Affiliations Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi, Japan, Japan Science and Technology Agency, CREST, Kawaguchi, Saitama, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: KY TK AI. Formal analysis: KY. Funding acquisition: AI. Methodology: KY TK DO AI. Project administration: TK AI. Software: KY KS. Supervision: TK. Validation: KY KS. Visualization: KY. Writing – original draft: KY KS TK DO AI. Writing – review & editing: KY KS TK DO AI.