May 2011
Intermediate to advanced
343 pages
10h 8m
English
Content preview from Biological Computation
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274 ◾ Biological Computation
Randomly created
Immature
Mature & Naive
Death
Activated
Memory
No match during
tolerization period
Match anything during
tolerization period
Don’t exceed activation
threshold during lifetime
Exceed activation threshold
CostimulationNo costimulation
Match
011010110101100...110101
FIGURE 6.2 e life cycle of a detector. (Adapted from Hofmeyr, Steven A. and
Stephanie A. Forrest, Evolutionary Computation 8, no. 4, 443–473, 2000. With
permission.)
TABLE 6.1 LISYS Parameters
Parameter Value
String length 49 bits
Number of contiguous bits to match (r) 12 bits
Activation threshold (τ) 10 matches
Decay period of match counter (m) 1 day ...
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