... the problem of word boundaryambiguity.As a result of these efforts, the performance of state -of- the-art supervised POS tagging shows over97% of accuracy (Toutanova et al., 2003; Gim´enezand ... tagging isnormally performed in the early step of NLP tasks,the errors in POS tagging are critical in that theyaffect subsequent steps and often lower the overallperformance of NLP tasks.Previous ... 567–572.1034Proceedings of the 50th Annual Meeting of the Association for Computational Linguistics, pages 1025–1034,Jeju, Republic of Korea, 8-14 July 2012.c2012 Association for Computational...