Acyclic flow shop的用法和样例：
- An ant colony optimization based algorithm for permutation flow shop scheduling was proposed.
- A two-objective model was constructed for flow shop rescheduling problem with arrivals of new jobs.
- An ant-colony heuristic algorithm was proposed for the No-Wait Flow Shop problem(NWFS) with makespan criterion.
- In the establishment of hybrid flow shop (HFS), how many parallel machines being set at every stage will be reasonable is a problem to be studied.