Affiliation: | (1) Hakodate College, Faculty of Education, Hokkaido University of Education, 040 Hakodate, Japan;(2) Faculty of Engineering, Saitama University, 338 Urawa, Japan;(3) Institute of Fluid Science, Tohoku University, 980 Sendai, Japan;(4) School of Medicine, Tohoku University, 980 Sendai, Japan |