**Naoko Tsukamoto \*, Yoshihiro Sugaya and Shinichiro Omachi**

Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan; sugaya@iic.ecei.tohoku.ac.jp (Y.S.); machi@ecei.tohoku.ac.jp (S.O.)

**\*** Correspondence: natsuka@iic.ecei.tohoku.ac.jp

Received: 30 June 2020; Accepted: 18 August 2020; Published: 21 August 2020
