Titlebook: DGOR/NSOR; Papers of the 16th A Helmut Schellhaas,Paul Beek,Mynt Zijlstra Conference proceedings 1988 Springer-Verlag Berlin Heidelberg 198

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Planning in Flexible Manufacturing SystemsFlexible Manufacturing Systems are defined as computer controlled production systems capable of processing a variety of part types. The main components of such a system are:

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Numerical Evaluation of Heuristics for the Multi-Item Single-Level Capacitated Lot-Size ProblemThe problem considered is the determination of lot sizes for multiple products to be produced on a single production facility with limited capacity. Demand is assumed to be deterministic and time-varying and must be met without backordering. The objective is to minimize the sum of setup and inventory holding costs.

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Flexibilization of Sequencing Priority RulesPriority rules can be defined as sequencing decision criteria according to which a job among those waiting for being processed by a machine is selected at the time a machine becomes free. Such scheduling procedures (e.g. “shortest-processing-time” or “minimum-slack-time” rules) are extensively discussed in the heuristic scheduling literature.

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Using an LP model for flow planningAt Hoogovens IJmuiden, the Dutch steel company, an LP model has been developed in order to support the flow planning in the order-driven part of the production process. The context is seen figure 1.

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Ein Vergleich zweier Lösungsansätze zur eindimensionalen VerschnittoptimierungZur Bestimmung einer kontinuierlichen Lösung eindimensionaler Verschnittprobleme werden in der Literatur das ‘spaltenerzeugende Verfahren’ von Gilmore und Gomory (1961) sowie das ‘Einzelschnittmodell’ von Dyckhoff (1981) vorgeschlagen. Der Vortrag zielt darauf ab, Gemeinsamkeiten und Unterschiede der beiden Lösungsansätze herauszuarbeiten.

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