Communication Signal Design Lab.


송홍엽 교수의 잡글


2004.04.13 06:18

송홍엽 조회 수:17100 추천:180

In 1948. Claude Shannon, then a young engineer working at Bell Telephone Laboratories in Murray Hill, M.J., published a landmark paper titled “A Mathematical Theory of Communication.” In that paper, Shannon defined what the once fuzzy concept of “information” meant for communications engineers and proposed a precise way to quantify it : in his theory, the fundamental unit of information is the bit.
Shannon showed that every communications channel has a maximum rate for reliable data transmission, which he called the channel capacity, measured in bits per second. He demonstrated that by using certain coding schemes, you could transmit data up to the channel’s full capacity, virtually free of errors-an astonishing result that surprised engineers at the time.
   “I can’t think of anybody who could ever have guessed that such a theory existed,” says Robert Fano, an emeritus professor of computer science at the Massachusetts Institute of Technology, in Cambridge, and a pioneer in the information theory field. “It’s just an intellectual jump; it’s very profound.”
   The channel capacity became an essential benchmark for communications engineers, a measure of what a system can and cannot do, expressed in many cases by the famous formula, C=Wlog2(1+P/N). In the formula, C is the capacity in bits per second, W is the bandwidth in hertz, P is the transmitter power in watts, and N is the noise power, also in watts.
   From space probes to cellphones and CD players, Shannon’s ideas are invisibly embedded in the digital technologies that make our lives more interesting and comfortable.
   A thinker, juggling enthusiast, and exceptional chess player, Shannon was also famous for riding the halls of Bell Labs on a unicycle. He died on 24 February 2001, at age 84, after a long battle with Alzheimer’s disease. –E.G. 송홍엽: IEEE Spectrum 2004년 3월호에서 발췌한 글입니다...  -[04/12-22:48]- 박재석: Bell Lab은 New Jersey에 있다고합니다. Murray Hill, M.J -> N.J  -[10/13-22:07]-
번호 제목 글쓴이 날짜 조회 수
공지 논문에 영어작문 주의사항 몇 가지 송홍엽 2008.05.22 9008
공지 젊은 학부생 여러분에게... 송홍엽 2008.11.20 5978
공지 우리학과 대학원생 모두에게 (특히, 박사과정들에게) 하고싶은 말입니다. 송홍엽 2014.01.20 6889
68 [펀글] 전화기를 최초로 발명한 사람은 누구인가 송홍엽 2008.05.23 6557
67 수학사 바로잡기 (1) - 오일러의 36명 장교문제와 조선시대 최석정 (수정본 - 일부 오류 수정) [1] file 송홍엽 2008.06.03 6378
66 [퍼온글] 우리전공의 학부생이 공부하면 좋을 수학과목 ?? 송홍엽 2003.03.23 6210
65 김정한 교수의 '창의적 수학교육' [1] file 송홍엽 2008.06.20 6050
64 [퍼온글] 에르도쉬 넘버 [1] file 송홍엽 2004.10.23 5928
63 [퍼온글] 애플컴퓨터 로고의 유래(?) 송홍엽 2006.02.09 5898
62 게임의 확률과 기대값 송홍엽 2004.12.02 5804
61 [펀글] 영문이력서 작성법 송홍엽 2011.03.27 5388
60 [퍼온글] 명왕성 이야기 송홍엽 2006.04.26 5380
59 [퍼온글] 달력의 유래 송홍엽 2004.04.01 5189
58 오류정정부호에 대한 이야기 송홍엽 2004.04.13 5126
57 [펀글] 프로그램 설계시 좋은 코딩 습관 송홍엽 2009.12.27 5119
56 채널코딩 세째 이야기 송홍엽 2003.11.13 4992
55 지금 내 전공분야는 공부한던 시절엔 나에게 가장 힘든 분야였답니다... 송홍엽 2003.06.03 4874
54 수학자와 공학자 송홍엽 2006.05.09 4768
53 채널코딩에 관한 첫번째 이야기 송홍엽 2003.10.13 4762
52 uncorrelated but not independent 송홍엽 2004.05.13 4724
51 정보화와 정보이론 송홍엽 2004.08.06 4635
50 랜덤변수의 variance가 0이면? 송홍엽 2004.05.13 4631