Swarm Intelligence Algorithms

178 Glowworm Swarm Optimization: A Tutorial

that the luciferin level of a glowworm as sensed by its neighbor does

not reduce due to distance

1

.

2. Positive taxis: Each glowworm is attracted by, and moves toward,

a single neighbor whose glow is brighter than that of itself; when

surrounded by multiple such neighbors, it uses a probabilistic mech-

anism (described in Section 14.1.3) to select one of them.

3. Adaptive neighborhood: Each glowworm uses an adaptive neigh-

borhood to identify neighbors; it is defined by a local-decision

domain that has a variable range r

i

d

bounded by a hard-limited sen-

sor range r

s

(0 < r

i

d

≤ r

s

). A suitable heuristic is used