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Thus, a new concept similarity measure is also proposed for retrieving formal concepts in the knowledge construction. The presented concept similarity employs appearance frequencies in the obtained knowledge construction. Our approach can be applied to retrieve relevant information because the obtained structure uses FCA in concept form that is definable by a conjunction of properties. This measure is mathematically proven to be a formal similarity metric. The performance of the proposed similarity measure is demonstrated in document plagiarism detection. Moreover, this paper provides an algorithm to build the information structure for document plagiarism detection. Thai text test collections are used for performance evaluation of the implemented web application.<\/jats:p>","DOI":"10.1155\/2021\/6662984","type":"journal-article","created":{"date-parts":[[2021,3,24]],"date-time":"2021-03-24T18:20:06Z","timestamp":1616610006000},"page":"1-10","source":"Crossref","is-referenced-by-count":16,"title":["Document Plagiarism Detection Using a New Concept Similarity in Formal Concept Analysis"],"prefix":"10.1155","volume":"2021","author":[{"given":"Jirapond","family":"Muangprathub","sequence":"first","affiliation":[{"name":"Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Surat Thani 84000, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Siriwan","family":"Kajornkasirat","sequence":"additional","affiliation":[{"name":"Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Surat Thani 84000, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1030-2438","authenticated-orcid":true,"given":"Apirat","family":"Wanichsombat","sequence":"additional","affiliation":[{"name":"Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Surat Thani 84000, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1016\/j.knosys.2017.08.008"},{"issue":"10","key":"2","first-page":"1753","article-title":"A survey on natural language text copy detection","volume":"14","author":"J. 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