[Tseng, Fan-Hsun; Chou, Li-Der] Natl Cent Univ, Dept Comp Sci & Informat Engn, Taoyuan 320, Taiwan.
[Chao, Han-Chieh; Jheng, Yong-Ming] Natl Dong Hwa Univ, Dept Elect Engn, Hualien 974, Taiwan.
[Chao, Han-Chieh] Natl Ilan Univ, Dept Comp Sci & Informat Engn, Ilan 260, Taiwan.
[Chao, Han-Chieh] Natl Ilan Univ, Dept Elect Engn, Ilan 260, Taiwan.
[Chao, Han-Chieh] Wuhan Polytech Univ, Coll Math & Comp Sci, Wuhan, Peoples R China.