National Institute of Technology, Sendai College, Miyagi, Japan
National Institute of Technology, Sendai College, Miyagi, Japan
Senju Metal Industry Co., Ltd, Tokyo, Japan
Copyright © 2018 Shunsuke Kuzuhara, Ayaka Sano et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.