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Types of network information resources

Source: Shangpin China | Type: website encyclopedia | Time: 2015-06-19
It is difficult to classify network information resources according to a unified and clear standard. Then the classification criteria and results of the above resources are also applicable Website construction Information resources. Here, we will not repeat the above classification, but only introduce several special network information resources commonly used on the network. It should be pointed out that the classification of these information resources below is not the result of a standard division, so there is overlap or duplication between various types of information.
 
network information
 
1、 Divided according to the adopted network transmission protocol
 
1. WWW (World Wide Web) information resources

It is transmitted between the WWW client and the server using the hypertext protocol. WWW information resources are a collection of text, images, graphics, sounds, etc. based on hypertext and hypermedia technology. It is displayed on the Internet in the form of intuitive and friendly graphical user interface pages. It can easily and quickly browse and transmit text, image, voice, multimedia, hypertext information distributed throughout the network. Therefore, it has developed rapidly from the 0401's to the second century's, and has become the mainstream of network information resources

2. Telent information resources

Telent information resources refer to the network communication protocol that links the user's computer with the remote computer login to share some information resources of the remote computer, including various hardware resources in the remote computer, such as printers, plotters, etc. Software resources such as various large databases, graphics processing programs, etc. Telent is a powerful tool for sharing information resources and one of the best ways to link users' computers with remote computers. Information resources services provided by Telent mainly include various commercial databases open to the outside world, such as government departments and scientific research institutions, and online public retrieval catalog OPAC provided by large and medium-sized libraries

3. FTP information resources

FTP information resources are information resources that complete copy and transmission of files from one system to another through FTP file transfer protocol. FTP contains a wide range of information resources, including text, image, sound, multimedia, database, etc. Through the FTP file transfer protocol, you can upload and download documents with any FTP server on the Internet. FTP is one of the main ways to publish information, transfer files and software on the Internet.

4. Gopher information resources

Gopher is similar to www's distribution mode, the information resource system of client book U server. It is a menu based network service mode. Most Gpher servers have menus of information resource directories. Users only need to select the required corresponding items in the menu of resource directories, By establishing a connection with a remote Gopher server, you can complete the access and query of remote online information.

5. User service group information resources

User service group information is a very unique, free, open and rich information in the Internet, and is also the most popular way of message exchange. It includes newsgroups, mailing lists, special discussion groups, interest groups, debates, etc. Users can use their own hosts to apply to join the discussion groups related to or the same with the topic they want to discuss. Users can send their views and opinions on a subject to the discussion group in the form of e-mail, and can also check other people's views and opinions from time to time, and give replies, Repeat this process to form discussion and communication. This kind of extensive, convenient and direct information is the most popular, dynamic and popular information resource on the Internet.

2、 Divided by the spread scope of network information resources

1. CD-ROM LAN information resources

Since the 1980s, on the basis of modern scientific and technological achievements such as computer technology, laser technology and sophisticated electronic technology, a new type of electronic publication, optical disk, has been developed. With its remarkable characteristics of high information density, maximum capacity, fast reading speed, and many types of information stored, it is deeply welcomed by users.

2. Traditional online retrieval information resources

This traditional online retrieval is a centralized network system, which consists of online retrieval center, communication network and retrieval terminal. The online gun and cable center mainly includes the central computer, online database, database retrieval software, etc. It is the central part of the online retrieval network. The communication network is the bridge connecting the retrieval terminal and the retrieval center, and its role is to ensure the smooth transmission of information. The retrieval terminal is the equipment for users to conduct man-machine dialogue with the system. When the user converts certain information requirements into specific retrieval language and retrieval expression through the retrieval terminal and transmits them to the host of the system via the communication network, the host will match them with the data stored in the system database, and transmit the retrieval results to the terminal equipment according to the user requirements, and then the terminal equipment will display or print them. In the whole process of online retrieval, most of the work is completed on the host. Therefore, online retrieval requires high processing speed and functions of the host
 
The advantages and disadvantages of this online retrieval system are very obvious. The advantage is that the whole system is under the centralized management of the system administrator, which is safe and reliable. The disadvantage is that the host bears the burden. Once a failure occurs, the embedded network will be paralyzed; Difficulty in network expansion: because the adopted technical standards are not open, the relevant technologies lack development momentum and flexibility. Because of the advantages of these online retrieval systems in information processing and their uniqueness in information services, online network information resources have gradually become an important information resource that cannot be ignored on the Internet because of their standardized processing indexing, high accuracy rate, wide range of disciplines involved in databases, and strong professionalism.

3. Internet information resources

The Internet information resource referred to here is a narrow concept. Because of its simple operation, friendly retrieval interface, and rich and colorful source stealing, its information includes not only directory, index, full text, etc., but also program, sound, image, and multimedia information. Such resources are mostly provided by institutions, groups, associations, companies and even individuals. There is no traditional information crossing mechanism for providing online information. The quality of information is uneven, and this kind of information is updated on the network very early. Because of this loose management mode, the Internet has become the fastest growing information resource in recent years, and its development speed is far beyond people's imagination.
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