Evaluating a Bio-Inspired Approach for the Design of a Grid Information System - Advancing Artificial Intelligence Through Biological Process Applications - page 300

Figure 3. Mean number of replicas per resource for different values of the pheromone threshold Tf

Figure 4. Overall system entropy for different values of the pheromone threshold Tf

at the equilibrium becomes larger. In conclusion,
the setting of Tf is a simple and efficient method
to tune the number of copy agents, and therefore
the rate of generation of new replicas.
Figure 3 shows the mean number of descriptor
replicas per resource and confirms that descriptor

dissemination is more intense if the pheromone
threshold is increased, because a larger number
of copy agents operate on the network. However,
a more intense dissemination is not always as-
sociated to a better reorganization, i.e. to a more
effective spatial separation of descriptors belong-
ing to different classes.