| 释义 |
▪ I. Shannon1|ˈʃænən|
An artificial salmon fly used on the river Shannon in Ireland. In full Shannon fly.
1867F. Francis Angling xii. 357 The large heavy-water Shannon flies are very showy affairs. 1872Ibid. xiii. (ed. 3) 393 The Shannon... Tag, gold tinsel and lemon-yellow floss.
▪ II. Shannon2 Information Theory.|ˈʃænən|
The name of Claude Elwood Shannon (b. 1916), U.S. mathematician, used attrib. and in the possessive to designate various concepts arising from his work, esp. Shannon's (second or capacity) theorem, a theorem regarding the ability of a noisy channel to carry information with no more than an arbitrarily small frequency of errors (see quot. 1970).
1956L. Brillouin Sci. & Information Theory i. 7 This is exactly Shannon's formula..for a problem with just two signals. 1956IRE Trans. Information Theory II. 102/1 In the discrete case this quantity [of information] is evaluated correctly according to the well-known Shannon formula. 1963N. Abramson Information Theory & Coding vi. 173 Shannon's second theorem can..be characterized as a little more than an existence proof. 1970H. A. Rodgers Dict. Data Processing Terms 98/1 Shannon's capacity theorem, in information theory, a theorem stating that it is possible to encode a source of messages having an information rate H bits/sec so that its information can be transmitted through a noisy channel with an arbitrarily small frequency of errors, provided that H {slle}C bits/sec, where C is called the limiting capacity of the channel. 1972L. L. Gatlin Information Theory & Living System iv. 98 A fundamental condition under which the Shannon theorem is valid is that the rate of emission from the source..must not exceed the channel capacity. |