• Proceedings of the Korea Database Society Conference
• /
• 2008.05a
• /
• pp.349-357
• /
• 2008

E-Catalogs are often duplicated in multiple database systems due to various reasons. This causes the problem of assuring ACID properties of global transactions in multi-database management systems. We suggest a log-based synchronization mechanism for a special situation that catalogs can be changed only in one system and the changes spread to other systems. We have defined several conditions that have to be satisfied to assure the synchronization of the information. We show that the information can be kept identical in a delayed manner if synchronization module fulfills the defined conditions. Finally we show that the suggested mechanism is useful by showing a real world application that uses this synchronization mechanism in e-commerce environment.

• Journal of The Korean Astronomical Society
• /
• v.50 no.4
• /
• pp.131-138
• /
• 2017

We present a new catalog of AGB stars based on infrared two-color diagrams (2CDs) and known properties of the pulsations and spectra. We exclude some misclassified objects from previous catalogs. We identify color areas in two IR 2CDs where most O-rich and C-rich objects listed in previous catalogs of AGB stars are found. By collecting new objects in these color selection areas in the two IR 2CDs, we find candidate objects for AGB stars. By using the color selection method, we identify 3996 new objects in the O-rich areas, 1487 new objects in the C-rich areas, and 295 new objects in the overlap areas of the two 2CDs simultaneously. We have found that 470 O-rich and 9 C-rich objects are Mira variables with positive spectral identification and they are newly identified AGB stars. We present a new catalog of 3828 O-rich AGB stars and 1168 C-rich AGB stars excluding misclassified objects and adding newly identified objects.

• Journal of The Korean Astronomical Society
• /
• v.52 no.5
• /
• pp.145-158
• /
• 2019

We conducted a survey of open clusters within 1 kpc from the Sun using the astrometric and photometric data of the Gaia Data Release 2. We found 655 cluster candidates by visual inspection of the stellar distributions in proper motion space and spatial distributions in l - b space. All of the 655 cluster candidates have a well defined main-sequence except for two candidates if we consider that the main sequence of very young clusters is somewhat broad due to differential extinction. Cross-matching of our 653 open clusters with known open clusters in various catalogs resulted in 207 new open clusters. We present the physical properties of the newly discovered open clusters. The majority of the newly discovered open clusters are of young to intermediate age and have less than ~50 member stars.

• Journal of Korean Library and Information Science Society
• /
• v.42 no.4
• /
• pp.89-109
• /
• 2011

This study intends to provide the essential data for developing kid's catalog in Korean public libraries. Focus was on the experience and perception of librarians who have provided a service for the children. To the end, this study investigated the children's information behavior and search behavior of OPAC from the viewpoint of librarians, and figured out what barriers are confronted when children are looking for reading materials. On the basis of data, discussed in details are practical considerations for kid's catalogs to improve the information access of children. The data were collected through a survey and depth interview with 29 librarians in public libraries, and referred to the existing OPAC for the discussion.

• Journal of KIISE:Computing Practices and Letters
• /
• v.14 no.9
• /
• pp.876-883
• /
• 2008

A clearly defined e-catalog (or product) information is a key foundation for an e-commerce system. A classification (or categorization) is a core information to build clear e-catalogs, can play an important role in quality of e-commerce systems using e-catalogs. However, as the wide use of online business transactions, the volume of e-catalog information that needs to be managed in a system has become drastically large, and the classification task of such data has become highly complex. In this paper, we present an e-catalog classifier system, and report on our effort to improve an e-catalog management process and to standardize e-catalogs for enterprises by use of automated approach for e-catalog classifier systems. Also we introduce some of the issues that we have experienced in the projects, so that our work may help those who do a similar project in the future.

• Journal of Korea Multimedia Society
• /
• v.8 no.4
• /
• pp.439-449
• /
• 2005

Distributed main memory database management systems (DMM-DBMSs) store the database in main memories of the participating sites. They provide high performance through fast access to the local databases and high speed communication among the sites. Recently, a lot of research results on DMM- DBMSs has been reported. However, to the best of our knowledge, there is no known research result on the performance of the catalog management schemes for DMM-DBMSs. In this work, we evaluated the performance of the partitioned catalog management schemes through experimental analysis. First, we classified the partitioned catalog management schemes into three categories : Partitioned Catalogs Without Caching (PCWC), Partitioned Catalogs With Incremental Caching (PCWIC), and Partitioned Catalogs With Full Caching (PCWFC). Experiments were conducted by varying the number of sites, the number of terminals per site, buffer size, write query ratio, and local query ratio. Experiments show that PCWFC outperforms the other two schemes in all cases. It also means that the performance of PCWIC gradually increases as time goes by. It should be noted that PCWFC does not guarantee high performance for disk-based distributed DBMSs in cases when the workload of individual site is high, catalog write ratio is high, or remote data objects are accessed very frequently. Main reason that PCWFC outperforms for DMM-DBMSs is that query compilation and remote catalog access can be done in a very high speed, even when the catalogs of the remote data objects are frequently updated.

• Journal of Korean Library and Information Science Society
• /
• v.24
• /
• pp.163-187
• /
• 1996

The library catalog is considered an important tool to provide library users with conveniences making a search for necessary information. Accordingly, the purpose of this study is to investigate "behaviors and attitudes" of library users in a university library using online and card catalogs together, to compare their distinctions between online and card catalogs and then to bring about reforms for the development of future cataloging, thereby improving the utilization of online catalog and its service expansion. For this, this paper carried out a survey research which was randomly questionaired 280 library users of four universities in Seoul from March 28th to April 16th 1996. Major findings are as follow : 1. Library users tended to use more online catalog(50.0%) than card catalog (21.9%). 2. The main reasons the library users us online catalog were time saving(24.0%), convenience of use(21.3%), multiple searching possibility (16.2%), and the preferences of card catalog were location of library materials(34.6%), time saving(17.5%), Bibliographic information(14.9%). 3. The major access points which library users utilized mostly in their online catalog are title(30.3%), author(29.2%) and subject heading (17.6%), and for card catalog, title(40.5%), author(34.6%) and call no.(11.1%). 4. The methods library users learned to use online catalog are terminal screen(44.7%), online manual(26.1%), and for card catalog, library orientation(42.6%), librarian's help(18.5%). 5. It was shown that library users were not mostly satisfied about their searching results: the users satisfied with online catalog in the order of partly(46.2%), as expected(42.3%), more than expected(10.4%), and with the card catalog in the order of partly(54.6%), as expected(27.3%), more than expected(10.4%). It was found that although library users preferred online catalog more than card catalog, 54.8% of the total catalog users were not satisfied about the search results they have had. 6. The items which library users want to add to online catalog are catalogs of materials other libraries have(41.6%), catalogs of the materials the library has(29.3%), titles of serial articles(17.7%). And the additional services library users want are checking function of loan materials and reservation of materials(15.5%), subject headings(14.5%), more terminals(13.4%), catalog use explanations(12.9%), multiple access points(11.0%), searching function of contents, abstracts, and indexes(9.6%). Considering the fact that library users tend to use more favorably online catalog than card catalog and the trend that library change from card catalog to online catalog, it is strongly recommended to su n.0, pply students with formal and informal training programs for online catalog use.talog use.

• Journal of the Korean Society for Library and Information Science
• /
• v.33 no.4
• /
• pp.17-27
• /
• 1999

The purpose of this these is aiming at making an investigation on the existing local publications which were including woodblock catalogs in the early Choson Dynasty and analysing the bibliographical matters. The overall findings of this study can be summarized as follows : First of all, publications contained in the woodblock catalogs are composed of 1292 titles. With the exclusion of 278 titles duplicated in Yongnamch' aekp'an-gi(221 titles) and Tong-gyongjapki(57 titles), there are one thousand fourteen titles in the woodblock catalogs in Kosach' waryo(989 titles) and Yongnamch' aekp'an-gi (25 titles). Secondly, publications which are included in woodblock catalog and being handed down to the present are composed of 160 titles. Excepting 43 titles which are duplicated in the woodblock catalogs containing Yongnamch' aekp'an-gi(33 titles) and Tong-gyongjapki(10 titles), there exist 117 titles. Thirdly, looking at the publications handed down to the present on the basis of location, 10 titles were published in five areas in Kangwon-do, 45 titles in 17 regions in Kyonsang-do, 33 titles in 10 areas in Cholla-do, 4 titles in 4 different areas in Chungchong-do two different areas in Pyongan-do, 1 titles in one area in Hamgyong-do, the other titles in three regions in Hwanghae-do.

• Journal of the Korean Society for Library and Information Science
• /
• v.48 no.3
• /
• pp.431-458
• /
• 2014

This research looked into both meaning and value of library catalog through the information behavior of user and suggested a plan to improve the quality and search functions, which are reflected the users' information needs and search behavior. U-CAT, a experimentally developed with reinforcing the contents and search functions of current library catalogs, was tested with the degree of satisfaction by the sample user group. The test results showed that the user's satisfaction on U-CAT was very high. The result verified that a little change with current library catalogs (to upgrade its quality) could result in a higher satisfaction of user group.

• Journal of Korean Library and Information Science Society
• /
• v.41 no.1
• /
• pp.5-28
• /
• 2010

The purpose of this study is to investigate the major features of Next Generation Library Catalogs. 'Next Generation Melvyl Pilot' of University of California Library System and 'SearchWorks' of Stanford University Library are examined. While the former is developed, based on OCLC WorldCat Local, the latter is based on the Blacklight, an Open Source Catalog Software. Both commonly provide the features, including enriched contents, facet navigation, keyword searching, relevancy ranking of search results, and user contribution, etc., but some functions vary in scopes and contents. Also, it seems that both are in process of development rather than complete implementations.