Achievements in science and Technology (XXVIII)

213、 The number of netizens in China ranks first in the world
2008 year 6 End of month , The number of netizens in China ranks first in the world .CNNIC Release 《 The first 22 The second statistical report on the development of Internet in China 》, By 2008 year 6 End of month , The number of Internet users in China has reached 2.53 Billion , For the first time, it surpassed the United States by a large margin to become the first in the world . however , For all that , The Internet penetration rate in China is only 19.1%, lower than 21.1% The global average of .

214、《EDVAC The first draft of the report 》
1945 year 6 month 30 Japan ,《EDVAC The first draft of the report 》 publish .《EDVAC The first draft of the report 》（“First Draft of a Report on the EDVAC”, Referred to as the first draft ） By Feng · Neumann wrote , First public description of computer logic design using stored program concepts , Later, as we all know “ feng · Neumann architecture ”.

215、Walkman
1979 year 7 month 1 Japan , Sony launched Walkman.Walkman A reporter from Sony used a small recorder Pressman And to , The feature is portability 、 Sound quality is good. , Research and development led by Akio Inoue and Akio Morita .Walkman Target teenagers , Emphasize youth and fashion , chinese “ Walkman ” One word refers specifically to Walkman.

216、 The first e-book was born
1971 year 7 month 4 Japan , The first e-book was born . Michael · Hart will 《 Declaration of independence 》 Enter the computer , The first e-book was born . It should be noted that , At this time, the computer has no monitor and keyboard , It is very difficult to input e-books . And then , Hart will 《 Bible 》 And Shakespeare into the computer , And in the same year 12 The Gutenberg project was launched in August .

217、 Virtualization requirements
1974 year 7 month , Classic papers in the field of virtualization have been published . Popek and Goldberg published papers “Formal Requirements for VirtualizableThird Generation Architectures”, Put forward “Popek and Goldberg Virtualization requirements ”, It provides a basis for judging whether a computer architecture can be effectively virtualized .

218、 Mathematical theory of communication
1948 year 7 month , Shannon published 《 Mathematical theory of communication 》. This year's 7 The month and 10 month , Shannon is in 《 Bell System Technical Journal 》 It is published in two parts 《 Mathematical theory of communication 》. This paper systematically discusses the definition of information , How to quantify information , How to better encode information . meanwhile , Shannon put forward the concept of information entropy .

219、C#
2000 year 7 month 7 Japan ,C# Release . Microsoft launched .NET Framework At the same time released C#.C# By Anders · The team led by heilsberg developed , Is based on .NET Framework、 Object oriented general high-level programming language .C# The initial name was Cool, Later, it was renamed due to trademark occupation .

220、QWERTY
QWERTY Is now widely used computer keyboard layout . This keyboard layout was first seen by Remington Rand in 1874 year 7 The first typewriter launched in January , The main purpose of this design is to reduce the loss and failure of typewriters . Even if there are many inconveniences ,QWERTY Finally, the layout is passed on to the computer keyboard because of usage habits .
 

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