September 14, 2019 Introduction to Computer Science Learning Summary:
1. learning content class: ① computer information processing ② ③ few examples of computer information processing Turing
①: a computer can have a general text, numerical, audio, image and video Five Forms. Information of these forms can be transformed in accordance with a certain rule or convention procedures. Representation of the text: coding method used to represent the text in each of the different symbols are assigned to a unique bit pattern. Value represents: the binary notation with the computer, only 01 values are represented. The audio uncountable, we find audio features, such as frequency, sonic, sonic Secondly digitize, convert digital signals into discrete. Take bitmap image analysis, an image is seen as a set of points, each point is called a pixel, the pixel position information, grayscale information, and color information is stored.
②: From equation See algebraic; maze randomly generated from looking at the map geometry; Logical from the polygraph. I understand the importance of computer learning mathematics through mathematical analysis, mathematical formulas, the specific instance of an abstract mathematical model, and then be solved by a mathematical formula.
③: computer mathematical model, its basic idea is to use a machine to simulate the process of people performing mathematical operations with pen and paper, I think this is very abstract, consists of a infinitely long tape, a head, a control components. Such a machine will be able to simulate human any calculation can be carried out, tell the truth I do not really understand, but it did not understand all these, is pushing me to seriously explore the mysteries of computer power! Turing machine controller regular mode: when the current state, current symbol, the new symbol, the head moves, the next state, i.e. when the Turing machine in which the state is "current state", the character read by a head as the "current symbol", read write head current character will be "new symbol" modify, and then operates according to the head, "head moving" direction, into the "next state." Turing machine with the controller according to the rules of calculation, until he came to "standstill" on the end.
2. After-school experience: the founder of information theory, Shannon, master, when observed electrical switches just inside the computer code may correspond to 0.1 true and false, they are skillfully combined, his theory still in use, I realized that we should keep creativity. I learned more about other contributions Shannon: seeking truth from facts is the most basic principle, to comply with the history and reality!