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