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“너무+형용사”공기 관계 그래프문법 구축을 통한 주관적 텍스트의 의견 분류
남지순 ( Jee Sun Nam ) 대한언어학회 2013 언어학 Vol.21 No.2
The Linguistic Association of Korea Journal, 21(2), 217-241. This study aims at classifying opinion polarity of subjective texts (such as positive vs. negative opinions) on the basis of a set of finite-state grammers (named Local-Grammer Graphs: LGGs) on ‘nemwu Adjectives’ collocations. Most opinion classification system function by recognizing opinion key words. However, some linguistic devices such as negation markers. Conditional or concession clause markers or some adverbs should be counted since they can play a role of Polarity Shifting Devices (PSD). The adverb menwu, being highly frequent in online opinion texts, can be used as a typical PSD, and thus the accurate analysis of this adverb will be crucial for implementing a reliable opinion classification system. In this study, a dichotomy of nenwu(i.e. an intensifying adverb vs. an opinion introducer)proposed by Nam(2012a) is used as the basic assumption for the construction of LGGs of ‘newmu Adjectives’. A set of finite-state local grammer graphs is constructed and applied in online movie review texts by means of the UNITEX system. The result shows the accuracy of 92.7% of recall and 97% of precision in the automatic classification of opinion polarity.
오피니언 극성을 전환하는 한국어 부정표현 자동 인식을 위한 연구
남지순 ( Jee Sun Nam ) 한국외국어대학교 언어연구소 2012 언어와 언어학 Vol.0 No.57
This paper aims to recognize Korean negation markers that can reverse the opinion polarity expressed by opinion keywords, which has emerged as a prominent obstacle for the opinion classification systems essentially based upon the polarity of keywords. In this study, Negation markers have been classified as negation adverb, negation auxiliary, and negation support term. The last type that is the most problematic form in recognition has been selected on the basis of the most frequent opinion keywords observed in predicative position. These negation markers are formalized by means of the finite-state local grammar graph formalism LGG and applied in the analysis of online opinion documents. The result obtained from the application of the LGGs in online movie review texts reveals that the LGG-based approach adopted in this study is efficient in recognizing Korean negation markers.
질의응답시스템을 위한 속성질의문의 의문사 및 속성명사에 대한 연구
남지순 ( Jee Sun Nam ) 대한언어학회 2010 언어학 Vol.18 No.4
This study aims to describe the interrogative types and the semantic features of the nouns of property in online queries in order to develop efficient Question-Answering systems. The online queries about the property usually appear as an interrogative sentence type, but sometimes the Wh-words can be omitted. Moreover, some non-interrogative forms such as imperative sentences or declarative sentences can be used as a query sentence. Therefore the system relied on only some characteristic keywords like interrogative pronouns cannot treat efficiently the focus of online queries: semantic property of noun phrases or syntactic structures should be considered as well. Nevertheless, the type of interrogative sentences for online queries is the most crucial element to extract the focus of the query. In this study, we classified the online queries about the property into 2 classes like <Measure-Property Query> and <Entity-Property Query> according to the question type, the distribution of noun phrases and the answer types. We suggested 7 semantic classes for the nouns of property, and the LGG methodology to represent formally our description about online queries.