Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.adass.org/adass/proceedings/adass97/nishiharae.html
Дата изменения: Fri May 15 22:17:28 1998 Дата индексирования: Tue Oct 2 03:29:16 2012 Кодировка: Поисковые слова: с р р р р р р п п р р р р р р с |
Next: Querying by Example Astronomical Archives
Up: Archives and Information Services
Previous: Hubble Space Telescope Telemetry Access using the Vision 2000 Control Center System (CCS)
Table of Contents -- Index -- PS reprint -- PDF reprint
Eiji Nishihara and Michitoshi Yoshida
Okayama Astrophysical Observatory, National Astronomical
Observatory of Japan, Kamogata, Okayama 719-02, Japan
Shin-ichi Ichikawa, Kentaro Aoki and Masaru Watanabe
Astronomical Data Analysis Center, National Astronomical
Observatory of Japan, Mitaka, Tokyo 181, Japan
Toshihiro Horaguchi
National Science Museum, Shinjuku, Tokyo 169, Japan
Shigeomi Yoshida
Kiso Observatory, University of Tokyo, Mitake, Nagano 397-01,
Japan
Masaru Hamabe
Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181,
Japan
Basically, the original MOKA was not a client-server system. Therefore, the sites where users can operate MOKA were considerably restricted. In order to solve this problem, we developed the second version of MOKA (MOKA2 ; Yoshida 1997) which is based on the World Wide Web (WWW). MOKA2 has been in operation since September 1996. Through the operation of MOKA2, several points to be improved were clarified. These were with respect to displaying preview images, managing database systems, and integrating environmental data. Then we started to develop the third version of MOKA (MOKA3), which will be in operation late in 1997. In this paper, we present a technical overview of MOKA3.
These data files are stored in the server machines at Mitaka, Okayama, and Kiso respectively. Newly produced data from night-by-night observations are processed into these three kinds of data at their source observatory. These new processed data are sent to Mitaka, then other observatories copy them from Mitaka. In MOKA3, this data transfer is achieved by distributed database mechanism in ORACLE for database files and by ftp-mirroring for header and preview image files. This mechanism efficiently copies only new data and keeps the database at each site consistent.
In the above procedure, many functions are processed locally on the client computer without accessing the server computer. For example, GUI components are dynamically switched over in compliance with the user's selection of searching strategies (e.g., by name or by coordinate). This local processing by the Java applet reduces load the server computer and the network. Moreover, as a part of the applet, the viewer of preview FITS images is also implemented in Java. Therefore, users can flexibly display the preprocessed images with their favorite display levels, and plot them at any position. In the earlier MOKA2, such a viewer was prepared as an external viewer of the WWW browser. Hence, available platforms are restricted. In addition, users must first install the viewer on their client machine.
The original CCD frames are stored in the observatory where they were produced. Registered users can utilize these data. MOKA3 has a window to request for these original data. From this window, the request for selected frames is automatically generated and sent to the MOKA3 administrator at the source observatory as an e-mail. Registration for MOKA3 data request is also available from this window.
The study on the data archival system is one of the projects promoted by the Japan Association for Information Processing in Astronomy (JAIPA). This work was supported in part under the Scientific Research fund of Ministry of Education, Science, Sports and Culture (06554001, 07304024 and 08228223), and JAIPA Nishimura foundation. The authors thank S. Nishimura for his continuous encouragement.
Horaguchi, T., et al. 1994, Publ. Natl. Astron. Obs. Japan, 4, 1
Ichikawa, S., et al. 1995, in Astronomical Data Analysis Software and Systems IV, ASP Conf. Ser., Vol. 77, eds. R. A. Shaw, H. E. Payne & J. J. E. Hayes (San Francisco, ASP), 173
Kosugi, G., et al. 1995, PASP, 107, 474
Takata, T., et al. 1995, Publ. Natl. Astron. Obs. Japan, 4, 9
Yoshida, M. 1997, in Astronomical Data Analysis Software and Systems VI, ASP Conf. Ser., Vol. 125, eds. Gareth Hunt and H. E. Payne (San Francisco, ASP), 302
Next: Querying by Example Astronomical Archives
Up: Archives and Information Services
Previous: Hubble Space Telescope Telemetry Access using the Vision 2000 Control Center System (CCS)
Table of Contents -- Index -- PS reprint -- PDF reprint