c_1and c_2 accelerate looking for the best local and group position, respectively. In earlier papers, these two values were considered equal to a constant value (usually 2). But further studies suggest that these two parameters also to be adjusted [26]. Experiments show that you can get the best results, in spite of adjusting c_1 on 2.5 at the beginning of the search and then its gradual reduction toward 0.5. In contrast, it is better that value of c_1 also be increased on a reversed route from 0.5 to 2.5. The PSO operation is shown in Fig. 2 in 3d space.