Discrete Particle Swarm Optimization with Scout Particles for Library Materials Acquisition

Algorithm 2

Initialization procedure of DPSO.

Step  1. Compute the sum of the lower bound on the number of materials in

   language l (∑^𝑟_𝑙=1𝐿𝐿_𝑙); the sum of the lower bound on the number of

   materials in category k (∑^𝑞_𝑘=1𝐶𝐿_𝑘).

Step  2. If (∑^𝑟_𝑙=1𝐿𝐿_𝑙) < (∑^𝑞_𝑘=1𝐶𝐿_𝑘)

    then randomly select a material i that is in language l,

     randomly select a department j, and set (𝑃^𝑡_𝑠)_𝑖𝑗=1,

     until all the lower bounds on the number of materials in all languages are reached.

Step  3. If (∑^𝑟_𝑙=1𝐿𝐿_𝑙) ≥ (∑^𝑞_𝑘=1𝐶𝐿_𝑘)

    then randomly select a material i that belongs to category k,

     randomly select a department j, and set (𝑃^𝑡_𝑠)_𝑖𝑗=1,

     until all the lower bounds on the number of materials belong to all categories are reached.