In this paper, a genetic algorithm is presented for an identical parallel-machine scheduling problem with family setup time that minimizes the total weighted flow time ( ). No set-up is necessary between jobs belonging to the same family. A set-up must be scheduled when switching from the processing of family i jobs to those of another family j, i  j, the duration of this set-up being the sequ...

The family Gramineaee, due to its great number of species and worldwide distribution, is one of the large and well- known family in the plant kingdom. All the species in this family are homotypes and are found wherever plant growth is possible. At present, more than 10,000 species in 620 genera belonging to 60 tribes of this family are known from all over the world. In Iran, besides many resear...