About the Authors

Masaaki Inaba

Roles Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Validation, Visualization, Writing – original draft, Writing – review & editing

masaaki.inaba@gmail.com

Affiliation Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan

Eizo Akiyama

Roles Funding acquisition, Supervision, Writing – review & editing

Affiliation Institute of Systems and Information Engineering, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan

Competing Interests

The authors have declared that no competing interests exist.