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  • 1.
    Grubbström, Robert W.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Some aspects on modelling as a base for scientific recommendations2001In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 30, no 9-10, p. 1126-1138Article in journal (Refereed)
    Abstract [en]

    Argues that the Hempel-Oppenheimian logical scheme for explanations and predictions also applies to prescriptive statements (recommendations) derived from theoretical models in the normative sciences. Presents ideas concerning the allocation of effort in developing normative models for such purposes. Three characteristics of the model and the model-building process, together with a suggested qualitative relationship between these properties, are discussed, namely the "applicability" of the model, the "simplicity" of the principle derived from the model, and the "level of technique " applied, a discussion similar to that of Bronfenbrenner. It is proposed that the subjective value to the model-builder may be envisaged as a function of these three main characteristics and that the model-design process then may be interpreted as a constrained optimisation problem.

  • 2.
    Wikner, Joakim
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Analysis of smoothing techniques: Application to production-inventory systems2006In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 35, no 9, p. 1323-1347Article in journal (Refereed)
    Abstract [en]

    Purpose - To provide an overview of how a number of frequently used smoothing-based forecasting techniques can be modelled for use in dynamic analysis of production-inventory systems. Design/methodology/approach - The smoothing techniques are modelled using transfer functions and state space representation. Basic control theory is used for analysing the dynamic properties. Findings - A set of expressions are derived for the smoothing techniques and dynamic properties are identified. Practical implications - Dynamic properties are important in many applications. It is shown that the different smoothing techniques can have very different influences on the dynamic behaviour and therefore should be considered as a factor when smoothing parameters are decided on. Originality/value - Dynamic behaviour of production-inventory systems can be analysed using control theory based on, e.g. transfer functions or state space models. In this paper a set of models for five common smoothing techniques are analysed and their respective dynamic properties are highlighted. © Emerald Group Publishing Limited.

  • 3.
    Wikner, Joakim
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Dynamic analysis of a production-inventory model2005In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 34, no 6, p. 803-823Article in journal (Refereed)
    Abstract [en]

    Purpose - A production-inventory system based on a model proposed by Axsäter is examined with the purpose of understanding the dynamic properties of the model. Design/methodology/approach - The information flow concept is discussed and a dynamic analysis using a system simplification approach is carried out to achieve an understanding of the dynamic behaviour of the system. Finally, the information flow is examined and analysed from a hierarchical perspective. Findings - The model is extended to include an order decision rule and a production unit and it is shown that the extended model has the capability to represent the dynamics of a number of different system management principles. The three different model instances of base stock, kanban and material requirements planning character are analysed. Originality/value - Dynamic modelling of production-inventory and supply chain models are usually analysed at an aggregate level not involving any complex relations of materials or capacities. In this paper, this line of research is merged with an approach based on multiple information channels using matrix representation and it is shown how a system simplification approach can be used for this purpose. © Emerald Group Publishing Limited.

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