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We hypothesized that it is not open access status but rather exposure in the PubMed platform that affects citation frequency in medical journals. In November 2008, medical journals from Korea began to be added to PubMed Central (PMC). Therefore, it would be interesting to know whether or not their impact factor based on Web of Science has increased since the journals were listed in PMC/PubMed. To answer this question, a citation analysis of seven journals that have been indexed in PMC since 2008 or 2009 was done. Only non-Medline journals were selected and the impact factors of five Medline journals were compared. The impact factor was calculated via Web of Science. Journal Citation Reports (JCR) data were used if the data of the target journals were provided in JCR. Trends for the impact factors of different years were analyzed using dBSTAT ver. 5.0. There has been an increasing rates of the impact factor for the seven non-Medline journals, 1.92 in 2011 over 2010; 3.27 in 2010 over 2009; 1.12 in 2012 over 2011. As for the five Medline journals, the increasing rate in 2010 over 2009 was 1.18; however, those of 2011 over 2010 and 2012 over 2011 were 1.01 and 1.04 respectively. The Science Citation Index Expanded impact factor of medical journals published in Korea can be increased if those journals are published in English and listed in PMC. This is an effect of the platform in which the journals are listed and not just an effect of free access.
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The Republic of Korea is the fourth ranking country for the number of PubMed Central (PMC) journals. As of September 2013, 75 journals from Korea are included in PMC. Starting in 2013, several research funding agencies for scholarly journal publications in Korea began to establish open access, full-text databases in the fields of medicine, science, and social sciences and humanities. In those databases, Journal Article Tag Suite (JATS) 1.0 is used so that articles written in the Korean language can be easily manipulated as full-text extensible markup language (XML). Editors or publishers must produce full-text XML files based on JATS 1.0. Thus this paper surveys the current state of the application of JATS 1.0 to Korean scholarly journals, including both those in English and those in Korean, focusing on the current technology, training programs, and the policy of the Korean government on open access, full-text XML. This experience in Korea can be a model for constructing mother-tongue, open access, full-text journal databases based on JATS 1.0 in other countries. The usefulness of JATS in scholarly journal publications not only of all fields, but also in all languages, is stressed.
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