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 还是老结论:像熵这么复杂的东西,不用来定量解决一些问题一般人看不出实际意义 |
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还是老结论:像熵这么复杂的东西,不用来定量解决一些问题一般人看不出实际意义 -- 越南人 - (0 Byte) 2005-1-20 周四, 上午8:57 (212 reads) |
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作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org
NEGENTROPY
A non-recommendable near synonym for information. The term has created considerable confusion suggesting that information processes negate the second law of thermodynamics by producing order from chaos. The history of the confusion stems from the mere formal analogy between Boltzmann's thermodynamic expression for entropy S = k log W and the Shannon-Wiener expression for information H = -log_2 pa. The only motivation for the negative sign in the latter is that it yields positive information quantities (the logarithm of a probability is always negative). The probability p of an event a and the thermodynamic value W including Boltzmann's constant k measure entirely different phenomena. A meaningful interpretation of negentropy is that it measures the complexity of a physical structure in which quantities of energy are invested, e.g., buildings, technical devices, organisms but also atomic reactor fuel, the infrastructure of a society. In this sense organisms may be said to become more complex by feeding not on energy but on negentropy (Schroedinger). (Krippendorff)
热熵 信息熵(负熵) 牛头不对马嘴的事，信息熵(负熵)名不付实。熵变成哲理，更是
莫明其缪。
作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org |
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