1, the concept of information
Information is sound and information transmitted through signals such as language, characters, graphics and images, which reflects the attributes, states and dynamics of everything.
Information is different from message, which is only the shell of information, and information is the core of the message; Information is different from signal, which is the carrier of information, and information is the content carried by signal; Information is different from data, which is a form of recording information.
2. Characteristics of information
Universality, dependence, value, timeliness, transitivity, sharing and authenticity.
3. Virtual reality technology
Virtual reality technology is a kind of simulation technology with computer technology as its core. It uses a computer to create a realistic virtual environment that integrates vision, hearing and touch. With the help of necessary equipment, users can interact and influence objects in the virtual environment in a natural way, thus creating an immersive feeling and experience equivalent to the real environment. The basic characteristics are: immersion, interaction and conception.
4. Artificial intelligence technology
Artificial intelligence (AI) refers to the use of computers to simulate human thinking, feeling and behavior. It is a new technical science to study and develop theories, methods, technologies and application systems that simulate, extend and expand human intelligence.
Applications include robotics, machine translation, machine proof, intelligent agents, pattern recognition, natural language understanding, machine games, expert systems, machine learning and many other fields.
5, the composition of the computer system
6, the working principle of the computer
Feng? Neumann, known as the father of computer, put forward the design idea of "stored program and program control", which was called Feng? The working principle and design idea of Neumann computer point out that:
① The computer system consists of five parts: arithmetic unit, memory, controller, input device and output device.
② Computers represent data and instructions in binary.
(3) Using stored programs and program control technology (the programs are pre-stored in main memory, and the computer can automatically take out the instructions one by one and execute them without human intervention).
Extended data:
Memorizing skills of key information technology knowledge in teacher recruitment examination in Heyuan city;
First, the first word memory method
The method of memorizing the first word refers to the method of extracting the first word of each sentence in the memory content, arranging and combining it in a certain order, and then memorizing it by using formulas.
Second, the table memory method
Tabular memory method refers to listing all knowledge points in a certain order in the form of tables and charts, which is a common memory strategy and is convenient for distinguishing and understanding memory materials.
Third, the keyword extraction method
Keyword extraction refers to a method of selecting representative words, languages and words from knowledge points for memory.
Fourth, the column memory method
Line-by-line memory method refers to the method of extracting concise key provisions when memorizing memory contents and realizing the memory of these contents through clear arrangement of provisions.
Fifth, comb the frame memory method
Carding frame method refers to the method of systematically combing the frame structure of knowledge points according to the logical relationship between knowledge points, so as to remember them in the order of logical development. This method needs to understand the knowledge points accurately and systematically.
Six, homophonic memory method
Homophonic memorization refers to extracting words from knowledge points and replacing them with words or words with similar pronunciation, which makes the memory formula smoother and easier to understand and remember.
Seven, associative memory method
Associative memory method refers to the integration and understanding of memory content and the association of integrated content. Associated objects can be common and easy to understand.