Communication Signal Design Lab.


송홍엽 교수의 잡글


2004.04.13 06:18

송홍엽 조회 수:13961 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 8898
공지 젊은 학부생 여러분에게... 송홍엽 2008.11.20 5946
공지 우리학과 대학원생 모두에게 (특히, 박사과정들에게) 하고싶은 말입니다. 송홍엽 2014.01.20 6747
89 학위논문 작성에 관한 조언 file 송홍엽 2014.01.25 1979
88 2013년 12월 31일 오후에 작성한 글: 새해는 시속 1400키로의 속도로 달려온다. file 송홍엽 2014.01.17 2273
87 [펀글] 한겨레 2011.12.23. 정봉주 유죄판결은 법적 착시현상 송홍엽 2011.12.25 2297
86 [펀글] 왜 우린 이런거 못만드냐고... 송홍엽 2010.05.09 2849
85 [펀글]프로운동선수의 대학학업 병행하기 송홍엽 2009.12.17 2876
84 [펀글] 교육의 의미 송홍엽 2008.02.19 2942
83 [펀글] 조선일보 1월2일 사설: 교육개혁 송홍엽 2008.01.03 2957
82 암호이야기 송홍엽 2008.05.21 2974
81 [펀글] 한반도 운하 건설을 반대하며 송홍엽 2008.02.20 3264
80 디지털 이야기... 송홍엽 2003.10.06 3310
79 [소고] 수학이란.... 송홍엽 2004.04.13 3375
78 [펀글-조선일보] 대중적인 책 내면 ‘이단아’ 취급 송홍엽 2006.09.18 3378
77 Re..랜덤변수의 variance가 0이면? 김태환 2005.07.30 3408
76 손바닥/손등 게임 송홍엽 2005.09.30 3419
75 유명한 퍼즐1 송홍엽 2004.04.01 3455
74 DMS와 정보량 송홍엽 2004.04.04 3487
73 [일반인을 위한 교양강좌] CDMA 통신기술 (2001.7) 송홍엽 2003.10.13 3534
72 수집합이란... 송홍엽 2004.04.13 3583
71 [퍼온글]독도대첩 송홍엽 2005.03.15 3587
70 Golomb-Puzzle 2003.12 file 송홍엽 2004.04.02 3603