Internetda axborot izlash

Advantages and disadvantages of the Internet
Plan
1. General information.
2. Search in catalogs.
3. Search indicators.
4. Methods for searching web documents.
5. Query language.
6. Find email addresses.
The most popular search engines on the Internet, how they work, advantages and disadvantages, mastering methods of searching for information on the Internet.
The WWW provides users with a number of document collections. Therefore, users always have the problem of finding the documents they are interested in among documents on the network. Search engines are used to solve this problem.
Search engines consist of a special website. The user provides the browser with information about the content of the main web page. The system provided a list of links to relevant pages. The operation of tracking systems is based on several models.
Search directories and search indexes
1. Search in catalogs.
Searchable catalogs are built on the principle of systematic catalogs of a large library. By linking to the search directories, a short list of the main topic categories can be found on the main page. For example: “Economics and Entrepreneurship”, “Economics and Entrepreneurship”, “Business and Economics”.
Each entry in the category list is a hypercharacter.
The browser will open the following catalog page, where this section is discussed in more detail. For example: “Business Law” is defined, that is, “Business Law”, consumer protection, “Advertising and Marketing”, “Electronic Commerce” and others.
As you continue to enter a topic, you may be taken to a list of specific web pages.
The search engine is used for primary, reference searches in catalogs on a given topic. They provide the classic, most meaningful resource search.
The number of search directories in the world is relatively small. This is because using them requires a lot of work (search directories are created manually). One of the largest search directories in the world is the Yahoo directory.
Search indicators
Search indicators provide a unique (non-repetitive) search for specific information. The basic principle of the search index is to search for Web documents using keywords (subject terms and phrases). The user describes the document to be searched using keywords and then assigns a search task. The search engine generates a list of web pages relevant to the search engine based on the data stored in the database.
Brief information about the found documents is published along with hyperlinks. Based on them, the user can select the necessary resources. The resulting (final) list is subject to filtering and sorting. Web page filtering involves removing duplicate characters. When sorting lists, a special order is established in the final list, that is, the most “useful” (from the point of view of the search engine) characters are at the beginning of the list, and the less useful ones are at the end. list.
There are now more than 10 thousand search indicators in the world. The most popular foreign search engine is Alta Vista. In Russia, Aport, Rambler and Yandex have the same search indicators.
Some Popular Internet Search Tools
Name
URL
Description
Search engines in Russian
Bring
http://www.aport.ru
Effective for performing simple search operations. It has advanced search tools.
Rambler
http://www.rambler.ru
Websites are ranked by the number of times users access them. Serves as a convenient Web portal.
Yandex
http://www.yandex.ru
Has the most advanced query language. He knows the rules of Russian grammar. Convenient to use when setting complex search tasks.
Search engines in English
Alta Visa
http://www.alta.visa/
There are many descriptions of documents in all languages. Convenient and one of the best for contextual search. Effective for searching scientific literature.
Lukos
http://www.lucos.ru/
There are convenient contextual and custom search tools.
Northern lights
http://www.northern/light.com
Effective for scientific research. It has one of the best reach rates on the web.
Yahoo!
http://www.yahoo.com
The world's largest search directory. Searches for email addresses.
Given that different search engines may use different information technologies to meet user requirements, it is necessary to be able to understand the advantages and disadvantages of each of these systems in order to effectively search for information.
4.4. Methods for searching web documents
References:
1. Gulomov S.S. and others. Information systems and technologies. Tashkent, 2000
2. Kenjaboev O. Modern information technologies. T. 1999
3. Shafrin Yu. Basic computer and information technologies. M., 1999.
4. Noraliev N.Kh. and head =. Computer science. 2004 in Tashkent.
5. Automated information technologies and savings
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