Eliminating Implausible Korean Morphological Interpretations by Using History of Previous Analysis and Lexical Association

A Korean word can be ambiguously analyzed into a lot of interpretations because Korean is a highly innective and agglutinative language. Although conventional Korean morphological analyzers try to eliminate implausible interpretations by using various intra-word connectivity information, there are still some implausible interpretations which can not be eliminated. In this paper, we present a method of eliminating implausible morphological interpretations by using two kinds of inter-word information. The rst information is extracted from the history of previous analysis. We prefer the interpretations including lexical morphemes which can be consistently analyzed from both the current word and its morphologically similar previous words in the history. And the lexical association between two morphemes is used for the second information. Here, we prefer the interpretations which can respect a lexical association between a morpheme and its adjacent morphemes. These lexical associations are automatically collected from a very large raw corpus. The experimental result shows that our system can reduce the word ambiguous rate from 3.50 to 2.73.