A Study on Syntax-Semantics Interface for Syntactic/Semantic Parsing

自然语言有多种方式来表达相同的语义内容。这些同义词给计算机对自然语言的理解带来了很大困难。为了解决这个问题，我们需要语义表示，使系统能够判断自然语言表达的同义词，而不是参考它们的语法结构。我们采用了Takagi等人提出的语义表示框架。(2006)，并开发了句法/语义解析器。句法分析器不仅通过使用输入句子的语法特征，而且通过参考上下文来生成语义表示。我们已经开发了利用该解析器的日语对话系统和日语教育系统。我们还开发了基于语义表示的自然语言理解技术。

Natural language has a number of ways to express the same semantic content. Such synonymous expressions pose a great difficulty to natural language understanding by computers. In order to solve the problem, we need semantic representation which enables the system to judge synonymity of natural language expressions without referring to their grammatical construction. We have adopted the framework for semantic representation proposed by Takagi et al. (2006), and developed a syntactic/semantic parser. The parser generates semantic representation not only by using grammatical features of input sentences but also by referring to the context. We have developed Japanese dialog system and Japanese education systems which take advantage of the parser. We have also developed techniques for natural language understanding based on the semantic representation.