First Author:   Shigeto Kitano Kobe University kitano@rieb.kobe-u.ac.jp   RIEB, Kobe University,, 2-1, Rokkodai, Nada, Kobe, 657-8501, Japan   +81-78-803-7009(Phone) +81-78-803-7009(Fax) http://www.rieb.kobe-u.ac.jp/users/kitano/index.html Second Author: Kenya Takaku Aichi Shukutoku University ktakaku@asu.aasa.ac.jp   Aichi Shukutoku University,, Aichi Shukutoku University,, 23, Sakuragaoka, Chikusa, Nagoya, 464-8671, Japan