binary waveform, rather than continuous waveform.
- Digital signals communicate information as 0 bit and 1 bit.
Modem is a device to translate digital signals into analog form.
Web 1.0 let us obtain access to information
Web 2.0 let us share that info with others
Web 3.0 all digital info, all contacts patterned into single meaningful experience
Semantic Web (semantic~ meaning)
What is Wireless?
Electromagnetic waves rather than some form of wire or cable
Enable individuals to conduct mobile computing
Wireless – No Wire
Mobile – Changes its location over time
Advantages:
Small enough
Sufficient computing power
Communicative wirelessly
access the Amazon.com, even though the company is located in Seattle, Washington. Customers can buy what they want anytime and Amazon.com can manage every order and inventories at their warehouse which are dispersed across major cities in real time.
Moreover, network computing allows people to be interactive, gather information, and give suggestions to each other. People can distribute and share
1. 이동통신의 개요
1-1 이동통신이란
무선통신이란 공간을 전송매체로 하는 통신으로 송신측에서 정보신호를 전자파에 실어서 공간에 방사하고 수신측에서는 공간을 거쳐 전송되어온 전자파를 수신하여 원래의 신호를 검출하는 방식의 통신이다. 또한 전파를 매체로 해서 통신하기 때문에 사
Networks, CBS Corporation, and Sony BMG, to place branded content on the site.
By June 2008, 38% of videos viewed in Internet came from YouTube, the closest competitor came to represent only 4%. Although Google did not reveal the figures, it was estimated that the site generated U.S. $ 200 million that year. In that month, an announcement on the YouTube home page daily cost $ 175,000, and the cu