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ABSTRACT Since core scholarly journals have been digitalized, demands on the perpetual access and long-term preservation of subscribed digital information resour ces by libraries are increasing. Various institutions and organizations have performed the prese rvation activities of digital scholarly resources for the purpose of responding those demands . This paper illustrates the National Digital Archive(NDA) system proposed and developed by KISTI and discusses on the NDA strategies which aim to improve the usability of archiv ed journal articles. In addition, NDA strategies of KISTI have been compared with those of intern ational researches and the economic validity of NDA has been verified by analyzing NPV , BCR and IRR. Legal system for improving the application of the archived data should be st udied next and high value-added data services have been suggested as our future studies in the final section.키워드: 항구 접근, 장기 보존, 국가 디지털 아카이브 , 학술논문정보, 보존 전략perpetual access, long-term preservation, national digital arch ive(NDA), journal articles, preservation strategy
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