Yoshiyuki KOJIMA,
Senior Engineer, Tunnel Engineering Group,
Structure Technology Development Div.,
Technological Development Dept.
Yutaka SATO,
Engineer, Tunnel Engineering Group,
Structure Technology Development Div.,
Technological Development Dept.
Kazuhide YASHIRO,
Engineer, Tunnel Engineering Group,
Structure Technology Development Div.,
Technological Development Dept.
Toyohiro ANDO,
Vice-Manager, Railway Facilities Div.,
Facilities Dept, East Japan Railway Company