Exact(3)
z j k and v j k are position and updating velocity of subvector j in iteration k, respectively.
For DPSO PTS-AIC, updating velocity variables in (8) requires 5 multiplications, 4 additions, and updating location variables requires computing the sigmoid function and generating a random binary variable, per dimension.
Let D denote problem dimension, updating velocity and position of particle i is realized by the following equation: begin{aligned} v_{ij}(t+1) = wv_{ij}(t) + c_{1} r_{1} (p_{ij}-x_{ij}(t)) + c_{2} r_{1} (p_{gj}-x_{ij}(t))~, end{aligned} (5).
Similar(57)
Generate new solutions by adjusting frequency, and updating velocities and locations/solutions. if (rand > r i ).
Although the priority-based representation simplifies the optimization procedure, updating velocities may be too complex because the routine velocity formula cannot update the permutation.
In addition, a novel approach is adopted to estimate pressure gradient when updating velocities and positions of fluid particles, leading to a relatively smoother pressure time history that is crucial for success in simulating problems about wave structure interaction.
update velocity vkt+1.
where is the updated velocity for each dimension.
Step 9: update velocity using median acceleration factor (in (12)) and generate particles for the next iteration (in (15)) and set k = k + 1.
In PSO, the trajectory of each particle is guided by the updated velocity based on gbest and pbest values, therefore a proper balance between them is needed.
Kirchhoff migration of the walkaway VSP, based on the updated velocity model, yielded better fault resolution at the reservoir level than did the surface seismic section.
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