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JP03

Determination of access log of SDBS

○Takeshi Saito（Polymer Standards Section, Organic Analytical Chemistry Division, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST)），Keiichi Tsukamoto（Tsukuba Advanced Computing Center, AIST），Seiji Murayama（Tsukuba Advanced Computing Center, AIST），Isao Kojima（Data-Intensive Computing Team, Grid Technology Research Center, AIST），Shinichi Kinugasa （Polymer Standards Section, Organic Analytical Chemistry Division, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST)）

Integrated Spectral Database System for Organic Compounds (SDBS) is a spectral database that contains six kinds of spectra of Mass, 1H NMR, 13C NMR, IR, Raman and ESR under a compound dictionary. Since April 1997, we open the system to public through the Internet freely; URL is "http://www.aist.go.jp/RIODB/SDBS/". Since introducing SDBS to the Internet, the number of accesses has been rising rapidly; total number of access at the end of July, 2004 was almost 85 million. The enormous accesses and the remarks from all over the world prove the importance and necessity of SDBS. We started to analyze an access log of SDBS for obtaining ideas of improving SDBS and to learn users and usage of SDBS. 1H NMR is the most popular spectrum to be accessed among our six kinds of spectra. Users access compounds having between six and ten carbon atoms, the access to compounds having more than 40 carbon atoms are also popular compare to the number of compounds compiled in SDBS.