[Chen, Jiageng] Cent China Normal Univ, Comp Sch, Wuhan 430079, Peoples R China.^[Miyaji, Atsuko;Su, Chunhua] Japan Adv Inst Sci & Technol, Sch Informat Sci, 1-1 Asahidai, Nomi, Ishikawa 9231292, Japan.^[Miyaji, Atsuko] Japan Sci & Technol Agcy JST CREST, Kawaguchi Ctr Bldg 4-1-8, Kawaguchi, Saitama 3320012, Japan.^[Miyaji, Atsuko] Osaka Univ, Grad Sch Engn, Osaka, Japan.^[Sen Teh, Je] Univ Sains Malaysia, Sch Comp Sci, Gelugor, Malaysia.