This work includes 8 different versions of Binary Particle Swarm optimization (BPSO) algorithm. Six of them utilize new transfer functions divided into two families: s-shaped and v-shaped.
The V4 (in BPSO8) transfer function which show the highest performance is called VPSO and highly recommended to use.
Main paper: S. Mirjalili and A. Lewis, "S-shaped versus V-shaped transfer functions for binary Particle Swarm Optimization," Swarm and Evolutionary Computation, vol. 9, pp. 1-14, 2013. Link: http://www.sciencedirect.com/science/article/pii/S2210650212000648
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