A: Literature databases are generally divided into bibliographic databases and full-text databases. In the process of historical development, some bibliographic databases have also begun to include full-text documents. When the amount of full-text collection reaches a certain proportion, the database belongs to the category of full-text database. In addition, although some databases contain full-text documents from the beginning, they use full-image format. None of these databases can be called full-text databases in the full sense. Full-text database in a complete sense refers to the source database that stores the full text of documents and can provide full-text retrieval, and CJFD is such a database.
2. Q: How is the periodical collection scope of CJFD determined?
A: A good literature database must carefully select the contents according to the positioning of database construction, which is the basis for ensuring the quality of the database. According to the figures released by the Press and Publication Administration, there are more than 9,000 periodicals published in China, of which about 6,000 are academic, knowledgeable and of good editing and publishing quality. The orientation of CJFD is mainly for academic exchange and knowledge dissemination, focusing on the collection of core journals and important journals in various disciplines. Its collection is 6 100 species, which may be adjusted with the development of China's publishing industry in the future, but it is basically stable at this scale.
3. Q: Does the scope of the database affect the recall and precision of literature information retrieval?
Answer: The coverage of database measures the coverage of information collection, while the recall and precision measure the retrieval effect of information retrieval system. There is no correlation between them. For an information retrieval system, there is a mutual relationship between recall and precision. Information retrieval systems at home and abroad can achieve 60-70% recall and 40-50% precision. It should be pointed out that with the advent of the era of knowledge economy, the global knowledge output has increased substantially year by year. Therefore, information users not only care about the recall and precision of information retrieval, but also care that the retrieved literature information should belong to the high-level and high-quality literature in this field. Many users suggested that CJFD increase the function of restricting the retrieval of core journals, and we will seriously consider this suggestion.
4. Q: How does CJFD control the data quality of the database?
A: First of all, since 1996, we have spent nearly two years organizing experts to study and formulate the Data Specification for Retrieval and Evaluation of China Academic Journals (CD-ROM Edition), which was reviewed and approved by the Press and Publication Administration at an expert review meeting and issued as an official document to the editorial departments of various journals, thus improving the standardization and normalization of CJFD source data from the source. Secondly, we have a review team, which is responsible for reviewing the received journal articles (mainly social science articles) to ensure the quality of the database content. Thirdly, the processing personnel use advanced software to digitize the articles to ensure the minimum error in the digitization. Then the articles are indexed and classified by professionals, and standardized control is implemented. Finally, we have the final audit procedure and the monitoring procedure after the data is online. These measures effectively ensure the data quality of CJFD.
5. Q: How does CJFD solve the copyright problem?
A: Clear copyright is not only the premise of database construction, but also the touchstone to distinguish the authenticity of database products. CJFD is a successful example to solve the copyright problem of electronic publications, which has attracted wide attention from academic and publishing circles at home and abroad.
All the documents included in CNKI database, including CJFD, are authorized by the periodical editorial department, literature authors and other publishing units according to law. The legal documents, such as China Academic Journals (CD-ROM Edition) Access Agreement and China Journals Network Access Agreement, which we signed with the periodical publishing unit, have been repeatedly discussed at the National Journals Conference, repeatedly demonstrated by legal experts and strictly examined by relevant leaders of the National Copyright Administration. However, the publishing unit of the journal has obtained the author's consent by signing a contract with the author, making an offer and making an announcement. Nearly 20,000 copyright agreements were signed, and nearly 24 million yuan in royalties were paid, which established legal rules in line with the Copyright Law of People's Republic of China (PRC) and the universal copyright convention, and standardized the rights and interests of periodical publishers, article authors and database developers. These practices have played a positive role in promoting the development and prosperity of China's information resources.
6. Q: Can CJFD search by category?
A: Of course. Because CJFD's knowledge classification system refers to China Library Classification and is not limited to China Library Classification, and considering that most information users are not familiar with the classification number of China Library Classification, CJFD does not list the classification number of China Library Classification as a search point. There are two ways for classified retrieval of CJFD: one is to go down in the primary retrieval according to classified navigation, and finally get the retrieval results. Another method is to click the similar literature in [Cluster Search] under an item in the search results to detect the similar literature with the item.
7. Q: Can CJFD conduct full-issue navigation retrieval?
A: Yes. The retrieval methods include: taking the name of Chinese periodicals as the retrieval point and limiting the time range to a certain year; After getting the retrieval results, we can retrieve all the articles in a periodical in a certain period of a certain year, and hope it is the retrieval point.
8. Q: What benefits does CJFD have for the construction and development of libraries?
A: This is not a theoretical issue. Its benefits have been proved by users' practical application. First of all, it greatly enriches the information resources of the library, thus greatly strengthening the information service ability of the library. Secondly, it is an electronic resource. The introduction of these resources can greatly promote the automation and networking construction of libraries and greatly improve the efficiency of library information facilities. Thirdly, due to the large-scale integration of resources, CJFD has adopted a standardized and standardized database construction method, providing an efficient and convenient network service platform, which can effectively promote the sharing of resources in the library community (such as the construction of network library projects in Beijing universities). Finally, the introduction of CJFD can help the library to carry out information user education and improve the information literacy of librarians and their users.
9. Q: Will the publication of CJFD affect the circulation of printed periodicals and endanger their survival?
A: Judging from the actual situation in recent years, the publication of CJFD not only did not pose a threat to printed periodicals, but also played a role in expanding the influence on some periodicals. Of course, for the developer of periodical database, printing this kind of periodical is the basis for the survival and development of its database, and the two are in a relationship of coexistence and common prosperity. Therefore, we must take active measures to protect and promote the development and prosperity of this periodical printing, and we must never kill the goose to get the egg, which will harm the interests of this periodical printing. We have established an all-round cooperative relationship with the editorial departments of various periodicals, and will continue to strengthen and develop this relationship in the future.
10. Q: Is point CJFD worth it?
As the saying goes, you get what you pay. CJFD is a product with high knowledge and high technology. It is not a simple electronic version of more than 6 100 periodicals, but contains huge added value of knowledge and technology. On the surface, CJFD is a database, but in fact it contains dozens of sub-databases of different disciplines. Compared with similar foreign database products, its price is quite low; The domestic price of CJFD is also less than 1/5 of its overseas price. Judging from the use of CJFD, the average cost of searching once or obtaining an original text is less than that of110 of searching once or obtaining a foreign language document. Of course, in the future, we will certainly build CJFD according to the requirements of building high-quality products, and constantly improve its gold content to thank the support and love of our users.