This study deals with widespread issues on constituent parsing for Korean including the quantitative and qualitative error analyses on parsing results. The previous treebank grammars have been accepted as being interpretable in the various annotation schemes, whereas the recent parsers turn out to be much harder for humans to interpret. This paper, therefore, intends to find the concrete typology of parsing errors, to describe how these parsers deal with sentences and to show their statistical distribution, using state-of-the-art statistical and neural parsers. For doing this work, we train and evaluate the phrase structure Sejong treebank using statistical and neural parsing systems and obtain results up to a 89.18% F $_1$ score, which outperforms previous constituent parsing results for Korean. We also define best practices for correct comparison to future work by proposing the standard corpus division for the Sejong treebank.

This study discusses a role of functional morphemes in Korean categorial grammars, providing the reviews of various types of Korean categorial grammars that have never been conducted so far, notwithstanding many previous studies on them. Previous work has presented different morphological segmentation because of Korean’s agglutinative characteristics, implying that Korean words may contain a different segmentation sequence of morphemes. We focus on functional morphemes in Korean categorial grammars, which have been explored in different ways by previous work. We present detailed analyses for postpositions and verbal endings in categorial grammars, insisting that the functional morphemes in Korean should be treated as part of a word, with the result that their categories do not require to be assigned individually in a syntactic level, and also that it would be more efficient to assign the syntactic categories on the fully inflected lexical word derived by the lexical rule of the morphological processes in the lexicon.

This paper is intended to investigate the linguistic behaviors of the Korean as-parenthetical constructions with the aim of devoting to distinguishing universal properties of as-parentheticals. This paper shows three prominent behaviors in Korean as-parenthetical constructions. First, the Korean as-clause displays that the syntactic gap in as-clauses must be realized as CP, through the variations on case marker. Secondly, the Korean as-parentheticals tend to have two types of as-clauses; CP or VP as-clause types. In addition, they are sensitive to the syntactic restrictions which can be noticed in as-parenthetical constructions: the sisterhood restriction and the Island boundary. Thirdly, the Korean as-parenthetical constructions reveal that they would require some pragmatic information which is combined with semantic meaning, in the process of getting the interpretation of as-clauses.