基于HPSG文法的Web问答技术研究

基于Web的问答系统既具有问答系统的智能性,又具有互联网上信息的丰富性,将是未来问答系统的发展方向。HPSG是目前计算语言学领域最重要的语言理论之一,这一基于合一的语言形式不仅被成功地用于解释理论上的语言现象,而且也被用于实际的应用程序。首先讨论了各种不同类型问答系统的关键问题所在。然后详细叙述了HPSG理论中符号的类特征结构。最后给出了基于AVMs的合一运算,并提出了把特征结构和合一运算分别应用于Web问答系统的问句分析、问句匹配及答案抽取的方法。该方法的实现将有效提高问答系统的实用性。

Research on HPSG Based Web Question-Answering Technology

Web based Question-Answering System combines intelligence of classical Question-Answering System with the rich information of Internet, it will be the development direction of Question-Answering System.HPSG is currently one of the most important formalisms used in computational linguistics.This unification-based formalism is successfully used in theoretical linguistics to explain many natural-language phenomena, and it is also used in practical applications. Firstly, the paper discusses the key problems of different kinds of Question-Answering system, then describes the typed feature structures of sign in HPSG and the AVMs based unification.In this paper a method of using feature structures and unification with questions analysis, questions matching and answers extraction of QA is presented.The method will efficiently improve the practicability of QA system.