1. Center for Regional Revitalization in Research and Education, Akita University, 1-1 Tegatagakuen-machi, Akita 010-8502, Japan
2. Faculty of Engineering
and Resource Science, Akita University, 1-1 Tegatagakuen-machi, Akita 010-8502, Japan
3. Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen-machi, Akita 010-8502, Japan
4. Graduate School
of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita 010-8502, Japan