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A number of recently proposed variants of the particle swarm optimization algorithm (PSOA) are applied to an extended Dixon-Szegö bound constrained test set in global optimization. Of the variants considered, it is shown that constriction as proposed by Clerc, and dynamic inertia and maximum velocity reduction as proposed by Fourie and Groenwold, represent… (More)

We consider 'invariance' in the context of optimization algorithms. 'Scale invariance' implies algorithm performance that is independent of uniform scaling of all the design variables. 'Frame invariance' in turn implies algorithm performance that is independent of frame translation and rotation. The notion of scale and frame invariance is not new to the… (More)

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