Sakai, Ko
Sakata, Yui
Kurematsu, Ken
Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI 19H01111A, 20H04487)
Research Institute of Electrical Communication, Tohoku University (H31/A12)
Article History
Received: 30 August 2020
Accepted: 12 March 2021
First Online: 13 April 2021
Competing interests
: The authors declare no competing interests.