About the Authors

Makoto Higuchi

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Validation, Writing – original draft

Affiliations Functional Control Systems Course, Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama, Japan, Ogino Memorial Laboratory, Nihon Kohden Corporation, Tokyo, Japan

Nobuo Watanabe

Roles Project administration, Resources, Supervision, Writing – original draft

nobuo@sic.shibaura-it.ac.jp

Affiliation Functional Control Systems Course, Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama, Japan

Competing Interests

MH is an employee of Nihon Kohden Corporation and receives a salary from Nihon Kohden Corporation. MH is also a doctoral student at Shibaura Institute of Technology. The results of this research are patent-pending, with MH as the inventor and Nihon Kohden as the applicant. This does not alter to PLOS ONE policies on sharing data and materials.