(9) sa-mwu-sil ('office) -> sam-sil (10) key-im ('game') -> keym Sentiment analysis or opinion mining techniques that utilize retrieval tasks to obtain the training sets or corpus data have to extract subjective chunks or morphemes from the real-world data.
as the number of the users using social networking services increases rapidly, sentiment analysis or opinion mining capable of automatically extracting the sentiment orientation from online posts has been gaining attention from NLP researchers (Hu and Liu, 2004;Kim and Hovy, 2004;Wiebe, 2000;Pak and Paroubek, 2010).