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The full text of 1648 research articles from five peer-reviewed representative LIS journals in these two periods was analyzed by using LDA. A total of 30 topics in each period were labeled based on the frequency of terms and the contents of the articles. These topics were plotted on a two-dimensional map using<jats:italic>LDAvis<\/jats:italic>and categorized based on their location and characteristics in the plots. Although research areas in some forms were persistent with which discovered in previous studies, they were crucial to the transition of the knowledge structure in LIS and had the following three features: (1) The Internet became the premise of research in LIS in 2015\u20132017. (2) Theoretical approach or empirical work can be considered as a factor in the transition of the knowledge structure in some categories. (3) The topic diversity of the five core LIS journals decreased from the 2000\u20132002 to 2015\u20132017.<\/jats:p>","DOI":"10.1007\/s11192-020-03657-5","type":"journal-article","created":{"date-parts":[[2020,8,12]],"date-time":"2020-08-12T04:09:48Z","timestamp":1597205388000},"page":"665-687","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Knowledge structure transition in library and information science: topic modeling and visualization"],"prefix":"10.1007","volume":"125","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5239-5396","authenticated-orcid":false,"given":"Yosuke","family":"Miyata","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1398-8906","authenticated-orcid":false,"given":"Emi","family":"Ishita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fang","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michimasa","family":"Yamamoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Azusa","family":"Iwase","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8486-2438","authenticated-orcid":false,"given":"Keiko","family":"Kurata","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,8,12]]},"reference":[{"issue":"3","key":"3657_CR1","first-page":"251","volume":"12","author":"B Allen","year":"1990","unstructured":"Allen, B., & Reser, D. 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