Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.|Department of Computer Science and Information Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China.