《2016 Some structural properties for the just-in-time level schedule problem》.pdf

PRODUCTION PLANNING CONTROL, 2000, VOL. 11, NO. 4, 357± 362 Some structural properties for the ju st-in-time level schedule problem HENRY AIGBEDO 2 1 0 2 y r K eywords just-in-time, level schedule, sequencing, assembly inventory reduction continue s to be of utmost concern a u systems, mixed-models r to manufacturin g managers. The just-in-tim e concept, b e as applied in discrete manufacturin g systems, means to F 8 A bstract. Just-in-time ( JIT) is a pull concept applied mainly produce only what is necessary, in the quantities needed, 1 2 in repetitive manufacturing systems, and it is characterized by a at the right times. It focuses primarily on invent ory 5 : scenario where only the required units are produced in the 0 reduction and the consequent elimination of associated 0 t required quantities at the required times. It particularly aims a at eliminating wastes associated with inventories in the system. super¯ uous costs ( Monden 1998) . A number of com- ] y A level schedule is desirable for a JIT assembly system, as it panies have reported impressive results from its imple- r a r serves as an approximation for all forms of smoothing. The min- mentation. b i sum formulation of the assembly line level schedule problem is L Most discrete manufacturin g systems are multi-echelon g one of those that has been mainly used in the literature. Using n