Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.|Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.|Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.|Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.|Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.|Department of Chemistry, National Cheng Kung University, Tainan City 70101, Taiwan.|Department of Computer Science, National Tsing Hua University, Hsinchu 30013, Taiwan.