Institute of Information Science, Academia Sinica, Taipei, Taiwan. alo1@illumina.com.|Institute of Information Science, Academia Sinica, Taipei, Taiwan. alo1@illumina.com.|Institute of Information Science, Academia Sinica, Taipei, Taiwan. alo1@illumina.com.|Institute of Information Science, Academia Sinica, Taipei, Taiwan. alo1@illumina.com.|Institute of Information Science, Academia Sinica, Taipei, Taiwan. alo1@illumina.com.