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  • P-ISSN1013-0799
  • E-ISSN2586-2073

토픽 모델링 기반 정보학 분야 학술지의 학제성 측정 연구

Topic Modeling based Interdisciplinarity Measurement in the Informatics Related Journals

정보관리학회지, (P)1013-0799; (E)2586-2073
2016, v.33 no.1, pp.7-32
https://doi.org/10.3743/KOSIM.2016.33.1.007
진설아 (과학기술정책연구원)
송민 (연세대학교)

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초록

본 연구는 인용 정보와 주제범주 분류체계를 기반으로 한 기존 하향식 접근법과 달리 문헌에 출현한 단어정보를 기반으로 세부주제를 자동 추출하는 토픽 모델링을 사용하여 학제성을 측정하였다. JCR 2013의 Information & Library Science 주제범주에서 5년 영향력 지수 상위 20개 학술지의 최근 5년 동안의 논문 제목과 초록 텍스트를 분석대상으로 사용하였다. 학제성을 측정하기 위한 지수로 ‘분야적 다양성’을 나타내는 Shannon 엔트로피 지수와 Stirling 다양성 지수, ‘네트워크 응집성’을 나타내는 지수로는 토픽 네트워크의 평균 경로길이를 사용하였다. 계산된 다양성과 응집성 지수를 통해 학제성의 유형을 분류한 후 각 유형을 대표하는 학술지들의 토픽 네트워크를 비교하였다. 이를 통해 본 연구의 텍스트 기반 다양성 지수는 기존의 인용정보 기반 다양성 지수와 다른 양상을 보이고 있어 상호보완적으로 활용될 수 있으며, 다양성과 응집성을 모두 고려하여 분류된 각 학술지의 토픽 네트워크를 통해 개별 학술지가 다루는 세부주제의 특성과 연결 정도를 직관적으로 파악할 수 있었다. 이를 통해 토픽 모델링을 통한 텍스트 기반의 학제성 측정이 학술지의 학제성을 나타내는 데에 다양한 역할이 가능함을 확인하였다.

Abstract

This study has measured interdisciplinarity using a topic modeling, which automatically extracts sub-topics based on term information appeared in documents group unlike the traditional top-down approach employing the references and classification system as a basis. We used titles and abstracts of the articles published in top 20 journals for the past five years by the 5-year impact factor under the category of ‘Information & Library Science’ in JCR 2013. We applied ‘Discipline Diversity’ and ‘Network Coherence’ as factors in measuring interdisciplinarity; ‘Shannon Entropy Index’ and ‘Stirling Diversity Index’ were used as indices to gauge diversity of fields while topic network’s average path length was employed as an index representing network cohesion. After classifying the types of interdisciplinarity with the diversity and cohesion indices produced, we compared the topic networks of journals that represent each type. As a result, we found that the text-based diversity index showed different ranking when compared to the reference-based diversity index. This signifies that those two indices can be utilized complimentarily. It was also confirmed that the characteristics and interconnectedness of the sub-topics dealt with in each journal can be intuitively understood through the topic networks classified by considering both the diversity and cohesion. In conclusion, the topic modeling-based measurement of interdisciplinarity that this study proposed was confirmed to be applicable serving multiple roles in showing the interdisciplinarity of the journals.

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