What are the advantages and disadvantages of modern information transmission methods? Don't tell a story, just write it out.

The five advantages of surfing the internet are: first, broaden your horizons, keep abreast of current events and news, and obtain all kinds of latest knowledge and information; Second, you can chat with netizens without scruple, pour out your worries, reduce the burden of schoolwork and relieve stress; Third, you can express your views and opinions on various issues on various BBS, and feel a sense of accomplishment; Fourth, you can improve the level of one of your hobbies; Fifth, making your own homepage has become a fashion. It's really great to upload your favorite pictures, open a discussion forum, post some posts and communicate with you. Specifically, information technology mainly includes the following aspects: 1. Sensing and identification technology is used to expand the function of human sensory organs to obtain information. It includes information identification, information extraction, information detection and other technologies. This kind of technology is collectively called "sensing technology". It can expand the perceptual function of almost all human sensory organs. Remote sensing technology combines sensing technology, measurement technology and communication technology, which further strengthens people's ability to perceive information. Information recognition includes character recognition, voice recognition and graphic recognition. A method called "pattern recognition" is usually adopted. 2. The main function of information transmission technology is to realize the fast, reliable and safe transmission of information. All kinds of communication technologies fall into this category. Broadcasting technology is also a technology to transmit information. Since storage and recording can be regarded as an activity of transferring information from the present to the future or from the past to the present, it can also be regarded as an information transfer technology. 3. Information processing and regeneration technology Information processing includes encoding, compression and encryption of information. On the basis of information processing, some new and deeper decision information can be formed, which is called "information regeneration". The processing and regeneration of information depends on the extraordinary functions of modern electronic computers. 4. Information application technology is the last link in the information process. It includes control technology and display technology. As can be seen from the above, sensing technology, communication technology, computer technology and control technology are the four basic technologies of information technology, among which modern computer technology and communication technology are the two pillars of information technology. The information technology extracted from Jiangsu Science and Technology Consulting Network refers to the technology of information collection, identification, extraction, conversion, storage, transmission, processing, retrieval, detection, analysis and utilization. All departments involved in these processes and technologies can be called information departments. Information technology can extend or expand people's information function. Information technology may be mechanical or laser; It may be electronic or biological. Information technology mainly includes sensing technology, communication technology, computer technology and microform technology. The task of sensing technology is to extend the information collection function of human sensory organs; The task of communication technology is to expand the function of human nervous system to transmit information; Computer technology is to extend the function of human thinking organs to process information and make decisions; Microform technology is to expand the function of human memory organs to store information. Of course, this division is only relative and general, and there is no clear boundary. For example, there are also information processing and collection in the sensing system, while there are both information transmission and information collection problems in the computer system. At present, a large number of sensitive elements have been developed in sensing technology. Besides the common camera can collect visible light wave information and the microphone can collect sound wave information, there are already sensitive components in infrared and ultraviolet bands that can help people extract important information invisible to human eyes. There are also ultrasonic and infrasound sensors that can help people get information that those people can't hear. Not only that, people have also made various olfactory, gustatory, light-sensitive, heat-sensitive, magnetic, humidity-sensitive and some comprehensive sensitive elements. In this way, we can also extract useful information that can't be collected by various human sensory organs, thus prolonging and expanding the function of human collecting information. The development speed of communication technology is amazing. From the traditional telephone, telegraph, radio and television to today's mobile phone, fax and satellite communication, these new modern communication means accessible to everyone have greatly improved the efficiency of data and information transmission, so that the work that used to have to be done by professional telecommunications departments can be done directly and conveniently by the staff of administrative and business departments. Communication technology has become the supporting technology of office automation. Computer technology and modern communication technology together constitute the core content of information technology. Computer technology has also made rapid development, with smaller and smaller size and stronger functions. From mainframe, medium-sized computer and minicomputer to microcomputer, notebook computer and portable computer. From PC, 286,386 to 486,586, the application of computers has also made great progress. For example, the application of electronic publishing house system has changed the traditional printing and publishing industry; The application of computer word processing system has changed the writer's original writing style, which is called "pen-changing" revolution; The practicality of CD-ROM has greatly expanded the information storage capacity of human beings, and a new generation of electronic publications such as e-books came into being. With the development of multimedia technology, music creation and animation production have become the fields that ordinary people can set foot in. Microfilm technology has developed rapidly abroad, and the United States is the most developed country. For example, the world-famous American UMI Company is a publishing company that collects, stores and provides literature retrieval, and its service scope includes nearly/kloc-0.5 million kinds of books, periodicals, doctoral dissertations, archives and originals. Its products not only include printed matter and microfilm, but also provide machine-readable information. During World War II, the company used the so-called microfilm technology to save many precious documents of the British Museum. So far, the company has grown from/kloc-0 to 65438+ million in the 5th century.