About the Authors

Takashi Kanamaru


Affiliation Department of Innovative Mechanical Engineering, Kogakuin University, Tokyo, Japan

Hiroshi Fujii

Affiliation Department of Intelligent Systems, Kyoto Sangyo University, Kyoto, Japan

Kazuyuki Aihara

Affiliation Institute of Industrial Science, The University of Tokyo, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Theoretical ideas and framework of the experiments: HF KA TK. Conceived and designed the experiments: KA HF TK. Performed the experiments: TK KA HF. Analyzed the data: TK KA HF. Wrote the paper: TK HF KA.