[1] Fujitsu R&D Ctr, 3F,Space 8,Pacific Century Pl, Beijing 100027, Peoples R China
[2] Fujitsu Ltd, Nakahara Ku, 1 Kamikodanaka 4 Chome, Kawasaki, Kanagawa 2118588, Japan
[3] Fujitsu Labs Ltd, Nakahara Ku, 1 Kamikodanaka 4 Chome, Kawasaki, Kanagawa 2118588, Japan