抄録
本論文では,語彙概念構造(LCS)に基づく言い換え生成モデルを提案する.LCSは語彙意味論の体系の一つであり,動詞の様々な統語・意味的な特性に対応する意味述語を組み合わせて動詞の意味を記述する枠組みである.提案するモデルは,LCSが表す意味構造の変形操作および語彙意味論的制約に基づいて言い換えを生成する.本論文では,例題として日本語の機能動詞構文の言い換えを取り上げ,言い換えの生成実験を通じてモデルおよび現存のLCS辞書の性能を検証する.
Lexical Conceptual Structure (LCS), a theory of lexical semantics, represents verbs as semantic structures using a small number of semantic predicates each of which denotes a particular property of verbs. The verb classification given by LCS has been used to explain regularities underlying lexical and syntactic paraphrases, such as verb alternation, compound word decomposition, and lexical derivation. This paper describes our LCS-based approach to paraphrase generation, and reports on our empirical experiments taking paraphrasing of Japanese light-verb constructions as an example class of paraphrases. Experimental results confirm that syntactic and semantic properties of verbs represented by LCS are beneficial to semantically constrain syntactic transformation in paraphrase generation.
