By John R. Pierce
Covers encoding and binary digits, entropy, language and that means, effective encoding and the noisy channel, and explores ways that info idea pertains to physics, cybernetics, psychology, and artwork. "Uncommonly good...the such a lot pleasing dialogue to be found." - medical American. 1980 version.
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Extra info for An Introduction to Information Theory: Symbols, Signals and Noise
Thus, a 9-cm Petri dish contains 600 000 processors, working in parallel. 05 mm/sec) that yields one switch per 2 sec. Thus, despite the large number of processors, the maximum number of operations is 300 000 per second, still hundreds of times slower than a modern PC. Thus, the conclusion is that for this type of processor to be viable reactions with extremely fast excitation dynamics must be found or designed. This leads nicely onto a discussion of the future of reaction-diffusion-based processors in the next subsection.
In their experiments they had a thin layer of silica gel with immobilised lightsensitive BZ catalyst and this was bathed with fresh catalyst-free reagents (open reactor). The gel was exposed to a uniform light intensity transmitted from a video projector through a 460-nm band-pass filter. The light intensity was adjusted to a reference level so as to keep the illuminated area below the excitability threshold (subexcitable) . During the experiment, the projected illumination field consisted of an array of square cells with the intensity in each adjusted at equal time intervals to random values above or below the reference level (Gaussian distribution about a mean centred on the reference value).
However, if silicon technology is reaching a plateau then the time is right to explore new computing methods. Really, the time has always been right because of the limitations of the current approach — thus the huge interest in natural computing methods, neural networks, etc. Agladze et al.  provided an estimation of the current state of silicon vs. chemical computation. 1 mm. Thus, a 9-cm Petri dish contains 600 000 processors, working in parallel. 05 mm/sec) that yields one switch per 2 sec.
An Introduction to Information Theory: Symbols, Signals and Noise by John R. Pierce