A self-adaptive PSO for joint lot sizing and job shop scheduling with compressible process times

This paper seeks the optimal value of the following decision variables:
- Sequence of processes on different item types over every machine.
- Sequence of processes of a given item type over the corresponding machines according to predefined precedence relations.
- Batch size of different item types over planning periods.
- Working speed/mode of each machine for processing on different item types.