First Author:   Masaya Yasuoka The University of Kitakyushu yasuoka@kitakyu-u.ac.jp   4-2-1, Kitagata, Kokuraminami Kitakyushu, 802-8577, Japan   +81-93-964-4318(Phone) +81-93-964-4318(Fax) Second Author: Minoru Watanabe Kobe University mi_nabe0923@yahoo.co.jp