Department of Applied Mathematics Dalian University of Technology;
Dalian 116024;
China;
School of Information Science and Technology;
Dalian Maritime University;
Dalian 116026;
China;
Department of Computing and Mathematics FFCLRP;
University of Sao Paulo;
Ribeirao Preto;
Brazil;
Optimization; self; organizing; map; (SOM); SOM-based; optimization; (SOMO); algorithm; particle; swarm; optimization; (PSO); genetic; algorithms; (GAs);