Department of Metallurgy;
Graduate School of Engineering;
Tohoku University;
Sendai 980-8579;
Japan;
Toho Titanium Co.;
Ltd.;
Kanagawa 253-8510;
Japan;
Fanuc Co.;
Ltd.;
Oshino-mura;
Yamanashi 401-0511;
Japan;
Before retirement:Graduate School of Environmental Studies;
Tohoku University;
Sendai 980-8579;
Japan;