2019-2020-1 semester 20,192,420 "Introduction to cyberspace professional security" in the first week learning summary
Harvest of learning
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In the process of self-study in Chapter 2, I understand the concept of digital is an umbrella in a digital basis and learned figures derived categories, such as natural numbers and integers and so on, their definitions have a very deep We understand and identify the relationship between them with each other. In positional notation, first of all I feel is very important to base this basic concept, as it defines the value of the digital and digital position count used in the system, and I can master the position notation use, they would find a few examples of exercises to strengthen the impression. Next, I also convert between hex with a very new understanding, which is different from high school to learn, so I think our band in real life has an indelible position. In binary addition or subtraction , we appreciate the books for some of the problem-solving methods, but also with the "carry" and "borrow" these two words to make our algorithm can better understand binary. At the end of this chapter, but also made me realize that the computer and the binary relationship, clearly tells us its benefits, indicating binary learn for learning our computer course is a considerable help.
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In the process of self-study in Chapter 3, first let me understand the most basic concepts or data and information , each chapter is introduced by various levels to promote these basic knowledge, so that I can digest and absorb. First exposure to computers in the compression of the concept, said before compressing it merely a physical aspects of the role. I understand that the data compression compression ratio definitions and data compression technology lossy and lossless concepts. Representing the data, to understand the data points analog and digital two types, which are information represented in different forms. The book once again stressed the binary large role in binary notation, let me understand , "Every time an increase in the number of bits available, the number can be represented by the state will more than double" the truth. Then I also studied digital data representation , a new learning pattern with a conventional symbolic representation values were compared to the I lead decimal complement and twos complement understanding, let me aware bit insufficient number of problems: numeric overflow . I am also a real representation of France binary and decimal floating-point representationWas learning, and he took out the manuscript of the book to calculate the conversion process, such a conversion experience thinking, deepened the memory of the formula. In the text notation, I learned ASCII character sets and Unicode character sets, to understand the relationship between the target of their history, as well as creator as well as their advantages and disadvantages and each other. Next, I learned three text compression types: keyword coding , run length coding , Huffman coding , understand their definitions and how they are encoded process have also been learning. Audio data representation in learning a variety of popular audio formats, as well as in our ordinary life used MP3 role and principles have a new understanding. In the color representation, the first level understand there are values to represent color, RGB color depth concept and made me understand a lot of new knowledge color. Although life has been heard pixels and a resolution of two words, in today's reading the book before the true definition of them got to know, I usually use the most in chat live GIF in it also introduced me to the definition and scope of application . For vector graphics and raster graphics comparison is also made me understand their respective areas corresponding to, and Flash definitions also made me understand a lot. Finally, I learned a video codec defined, as well as its use of compression as well as the current several popular codecs such as Sorenson, MPEG and so on.
Learning and problem solving process
- A. For conversion between hex it is not very skilled at doing binary decimal conversion in addition to often do not know how to start, for example, change the binary octal and so on.
- II. Binary notation there is blurring.
- III. Subtraction in the number of fixed-length binary complement not quite understand the book for ideas.
- Resolution process: I will repeatedly try to figure out the definition of those amounts, and a deep understanding of, and then re-read examples, see if you can identify the problem-solving ideas, I will explain this Internet search deeper relevant, repeated viewing, to find ideas. But also to humbly ask other students to constantly improve their understanding of vague knowledge of the existence of the book.