Cellular Phone Systems describing each of the four generations
- 최초 등록일
- 2011.05.12
- 최종 저작일
- 2010.12
- 5페이지/
MS 워드
- 가격 1,000원
소개글
핸드폰 통신망 변천사를 레포트로 작성한 영문 레포트입니다.
목차
I. Introduction
II. History
본문내용
I. Introduction
As of 2010, 21st century’s a must have item is cell-phone. All age people are having at least one cell phone in the United States. A word “Cell phone” meaning is a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network (JewellElizabeth, AbateFrank, McKeanErin, 2005). Since cell-phone began to sell to public, less than half a million cell phones in use in the United State in 1985, but now about 280 million cell phones in use. Also, 1.2 billion handsets are sold worldwide every year while over 150 million phones are being replaced every year. 4.3 million people are having a cell phone conversation at any given second in the world; 89 percent of U.S. citizens used cell phones in 2009, it became as 37 billion dollar to wireless revenue. These huge numbers were established from many different functions of cell phone, such as SMS(short message service), Internet access, games, camera, Bluetooth, e-mail, RFID and many other things.
참고 자료
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