2. Briefly describe the characteristics of network information resources. A: The characteristics of network information resources are huge quantity and rapid growth. Frequent updates, impermanence and scattered distribution; Good and bad.
3. How to correctly understand the corresponding relationship between network information and printed publications in publishing types? According to the types of publications, there is a similar correspondence between network information resources and printed publications. For example, printed periodicals have online periodicals, printed books have online books, printed reports have online reports and so on. This correspondence is limited to our understanding of the information types of network documents and cannot be applied to specific documents. For example, the early printed literature generally had no online form, and most of the current printed academic literature is unlikely to find the corresponding online electronic version.
4. What are the original network information and the secondary network information? According to whether the content is original or not, network information resources are divided into primary resources and secondary resources. Primary resources refer to original information published for the first time, and secondary resources refer to reprinting existing information.
5. What are visible and invisible network information? Network information resources can be divided into tangible resources and intangible resources according to whether they belong to the scope of search engines.
6. Briefly describe two conditions of network visual information. Visible resources are resources that can be searched by search engines. This resource must meet two conditions: first, it must contain HTML hyperlinks, and second, it has no password.
7. Briefly describe the relationship between website and webpage. Web pages are text files written in HTML or DHTML, XML and other languages. A website is a website with an independent domain name and several related pages. According to the analogy of Microsoft, if WWW is regarded as a large library on the Internet, then every website is a book and every webpage is a page of this book.
8. Why is academic information on the Internet not easy to obtain? There are three main reasons: first, it is usually necessary to search the home page information through intermediary databases such as search engines. Using these tools requires some special skills, especially when you want to find online information efficiently. Second, under normal circumstances, the results obtained by using only one or two search engines are often a drop in the ocean. Third, the ratio of online academic information to non-academic information is 1: 10. Moreover, a lot of academic information on the Internet exists in the form of invisible resources. So it is difficult to find information online. 9. What are the three types of search engines according to their working methods? According to different working methods, search engines can be divided into theme engines, directory engines and multiple engines.
10. Briefly describe the three components of the topic engine. Topic engine consists of three main parts: robot, index and search software.
1 1. Please name a typical foreign and domestic theme engine. The representative of foreign theme engine is Google, and the representative of domestic theme engine is Baidu.
12. Why is the topic engine not classified as the directory guide engine? The classification approach provided by the topic search engine is either the result of automatic classification or the classification data borrowed from other directory engines (for example, Google uses Netscape's open directory project classification), so the classification retrieval effect is not as good as that of the directory guide search engine with careful manual classification.
13. Briefly describe the main differences between topic engine and directory guide engine. (1) The depth of information processing, the directory-oriented engine is the website, and the theme-oriented engine is the webpage; (2) Information processing mode: the directory guide engine is manual and the theme engine is fully automatic; (3) The quality and quantity of information, the quality of directory-oriented engines is relatively high, and the number of theme-oriented engines is relatively large.
14. Why is the topic search effect of the directory guide engine not as good as that of the topic engine? The topic retrieval of directory guide engine is only carried out in the artificial description language of the website, and the search scope is limited. The results are usually classified class names and website names, and the number of results is far less than that of topic engines.
15. List a typical representative of directory navigation engines at home and abroad. The foreign representative of the directory engine is Yahoo! The representative in China is Sina. com。
16. What is a multiple search engine? Briefly describe its working principle. Multi-engine is a search engine that plays the role of retrieval intermediary. The multi-engine itself has no database for storing web information. When a user queries a keyword, it converts the query request into a command format acceptable to several other search engines, accesses these search engines in parallel or selectively and queries the keyword, processes the results returned by these search engines, and then returns them to the user.
17. Give a typical example of multi-engine at home and abroad. Dogpile is the representative of many foreign search engines, and Wan Wei is the representative in China.
18. Briefly describe the main differences between Chinese and foreign search engines. Chinese engine can search information in foreign languages such as English, and foreign engine can also use Chinese; So the difference between the two engines is not the language used, but the focus of collecting and processing information. The main information collected and processed by Chinese engines is Chinese web pages, and the effect of searching Chinese materials is usually better than that of foreign languages engines. On the contrary, if you need to find English materials, it is better to use overseas English engines directly.
19. What role can Baidu engine's webpage snapshot play? When Baidu server collects web pages through the program, it will keep a backup of the web pages in the buffer. A "webpage snapshot" is a link to a webpage backup. When clicking on the title of the search results has no results, you can use "webpage snapshot" to help get some "disappeared" webpage information.