Produktionsplanungs- und -steuerungssysteme (PPS-Systeme) haben in den letzten Jahren in der wissenschaftlichen Literatur und der betrieblichen Praxis starke Beachtung gefunden. Während diese Systeme die Problematik der (Groß-) Serienfertigung (einigermaßen) bewältigen, sind sie für die...

Three types of multi-item capacitated dynamic lotsizing and scheduling models are well established until now: The capacitated lotsizing problem, the discrete lotsizing and scheduling problem as well as the continuous setup lotsizing problem. An analysis of the underlying fundamental assumptions...

Nicht in erster Linie der Stoff macht das Wesen eines Faches aus, sondern das in ihm gepflegte Denken. ... Die Pflege des betriebswirtschaftlichen Denkens ist nach meiner Meinung neben der Forschungsarbeit die wesentliche Aufgabe der akademischen Betriebswirtschaftslehre. Nach unserer Meinung...

A batch sequencing model with sequence-dependent setup-times and -costs is used to compare modelling and solving with two different general solvers. "Conceptual models" are implemented in the constraint propagation / logic programming language CHARME and solved with the PROLOG inference engine....

Lotsizing and scheduling comprises activities which have to be done repeatedly within MRP-systems. We consider the proportional (multi-item, capacitated, dynamic) lotsizing and scheduling problem which is more general than the discrete lotsizing and scheduling problem as well as the continuous...

This paper presents a mixed-integer program for the dynamic lot sizing and scheduling problem in a multi-level, single-machine environment. It turns out that in contrast to single-level problems the integration of initial inventory is a crucial aspect if generality should not be lost. It is...

Cellular automata were used to model and to simulate phenomena in the area of physics, biology and medicine. In this paper it is now shown how the idea of cellular automata can be applied to optimization problems as well. As an example a cellular automaton is used as a basis for solving...

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...

A new model is presented for capacitated lot-sizing with sequence dependent setup costs. The model is solved heuristically with a backward oriented method; the sequence and lot-size decisions are based on a priority rule which consists of a convex combination of setup and holding costs. A...