In diesem Beitrag zeigen wir, wie die Planungsqualität in einem Unternehmen durch die Integration der Ablaufplanung in die Losgrößenplanung erheblich gesteigert wurde. Gegenstand der Untersuchung war eine Fräsmaschine mit reihenfolgeabhängigen Rüstkosten und Rüstzeiten, wobei für einige...

This paper deals with lot sizing and scheduling for a single-stage production System where setup costs and times are sequence dependent. A large bücket mixed integer programming (MIP) model is formulated which considers only efficient sequences. A tailor-made enumeration method of the...

We present a model for the vehicle and crew scheduling problem in urban public transport Systems by combining models for vehicle and crew scheduling that cover a great variety of real world aspects, especially constraints for crews resulting from wage agreements and internal regulations. The...

Lotsizing and scheduling comprises activities which have to be done repeatedly within MRP-systems. First, we show via a simple example the deficiencies arising within the MRP-context by neglecting the interrelationships of multi-stage systems. Second, we propose a new model for multi-item,...

The well-known Capacitated Lot-Sizing Problem (CLSP) is based on the assumption that for each lot in a period setup costs are incurred. The setup costs of a CLSP solution can be reduced by linking the production quantities of an item which is scheduled in two adjacent periods. Therefore we...