A Two-Level Morphological Analysis Of Korean

ABSTH,AGT The two-level morThology model has received a grcal deal oJ attention and ha,s been implcmcnlcd for languages like li'ianish, English, JalmnCSe , Ru,ssian, l,'rcnch, and so on. However, this model has been claimed to be inapproprialc ]or Korean morphological analysis, because the complez" conjugation (inflection) and agglutination in word formation, and the syllabic-based representation oa t. worda may lead to a huge a'am-ber of two-level morphological rules, ht this paper, we show that the twoJcvcl model can be succcs,sJully applied to Korean and its rule size i~ limiled to only 52. Art czlensiou of two-level morphology is described for Korean language. 1992) is a well-known comi)u~,at, ional model of morphology , which ha~ adaptability a~ well ~u~ siml)lic-ity. In t)ractice, this mo(M ha.s been successfully al)-.level model ha~ been considered to l)c inapl~rol)riate two-level morphological analysis of Korean is believed to be diliicuit and infcasible because the complex conjugation (inItection) ainl agglutination in word formation , and the syllable based representation of words may lead to a huge mmlber of two-level morphologicM rules. In this paper, we show that the two-level model can be successfully applied to Korean and its rule size is limited to only 52. This paper presents a successful two-lcvel system [*or Korean morphological analysis. The system wa.s ba~ed on a shareware PC-KIMMO (Antworth, 1990); however, wc extended the I/O component of I'(J-KIMMO to handle Korean alphabet HANUUL; we c(m.~,ructed a Korean dictionary and a Korean morphological grammar (i.e., morphotactics and spelling rules) tot the I'G-K1MMO; wc also used a shareware KGI';N (Miles, 1!191) to translate the linguistic spelling rules into the executable automal, a (i.e., tinite state transducers (FSTs)). This paper focuses on the dictionary and the morphologicM grammar for Korcalt. TWO-LEVEL REPRESENTATION OF KOREAN WORDS The two lewd model is conceLned with directly mapping bctwcen two rcprescntations of a word: (1) tile sur]hcefo,'m (SF) ~ it appears in the text, and (2) the lexical ]orm (LF) which is represented ms a sequence of ba.~ic morphs and diacritics (c.g., '+' to mark morpheme me boundary and '~' for word boundary). As a re suit, an input word in the two-level modcl is analyzed by mapping the word itself (SF) to a sequence of le~ ical forms in dictionary without intermediate stages. In this section, we present a two-level representation of i(ore~m words. 'lb understand the two-level description for Korean ntorphology, one should be properly familiar …