Within a cross-dock, the assignment of trucks to dock-doors and the scheduling of trucks to be processed are two major operational decisions. Conventionally, assignment and scheduling decisions are made sequentially. However, solving the two problems sequentially can lead to sub-optimal solutions because the objectives of the two problems are in conflict with each other. To gain further insights, we create an integrated model which is capable of simultaneously scheduling and assigning trucks at cross-docks. We contrast the integrated model with a sequential model which first schedules trucks for processing and then assigns them to dock-doors. Experiments demonstrate that the integrated model can produce superior solutions, despite that it is computationally more expensive.
Progress in Material Handling Research: 2016
Rijal, Arpan; Bijvank, Marco; and de Koster, Rene, "Integrated Versus Sequential Scheduling and Assignment at a Unit Load Cross-dock" (2016). 14th IMHRC Proceedings (Karlsruhe, Germany – 2016). 23.