Faunhofer Project Center for Production Management and Informatics PMI

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  • Publication
    An inverse economic lot-sizing approach to eliciting supplier cost parameters
    ( 2014)
    Egri, Péter
    ;
    Kis, Tamás
    ;
    Kovács, András
    ;
    Váncza, József
    Recent literature on supply chain coordination offers a wide range of game theoretic and optimization approaches that ensure efficient planning in the supply chain, but assume that the involved parties have complete information about each other. However, in reality, complete information is rarely available, and those models alone do not present any incentive for the parties to reveal their private information, e.g., the cost parameters that they use when solving their planning problems. This paper proposes an inverse lot-sizing model for eliciting the cost parameters of a supplier from historic demand vs. optimal delivery lot-size pairs, gathered during repeated earlier encounters. It is assumed that the supplier solves a single-item, multi-period, uncapacitated lot-sizing problem with backlogs to optimality to calculate its lot-sizes, and the buyer is aware of this fact. The inverse lot-sizing problem is reformulated to an inverse shortest path problem, which is, in tu rn, solved as a linear program. This model is used to compute the ratios of the supplier's cost parameters, i.e., the setup, the holding, and the backlog cost parameters consistent with all the historic samples. The elicited cost parameters can be used as input for various game theoretic or bilevel optimization models for supply chain coordination. Computational experiments on randomly generated problem instances indicate that the approach is very efficient in predicting future supplier actions from the historic records.
  • Publication
    Designing cooperation mechanisms for supply chains
    ( 2012)
    Váncza, József
    ;
    Egri, Péter
    The paper defines generic requirements towards cooperative planning in the nucleus of any supply network that is constituted by a pair of autonomous manufacturer and supplier who possess asymmetric information on demand forecast and costs, respectively. Then a novel way is suggested for investigating this problem by means of the apparatus of mechanism design. The analysis results in some provable generic properties as for efficiency and truthfulness, and shows the impossibility of fair cost and profit sharing. Further on, design principles towards a payment scheme are devised that provide incentive for the partners to cooperate in order to minimize costs. This payment can be considered the price for a flexible supply service. As examples, the generic framework is instantiated with two particular cooperative supply mechanisms.
  • Publication
    Open source ERP: Reasonable tools for manufacturing SMEs?
    ( 2011)
    Sauer, Marcus
    ;
    Egri, Péter
    Information technology is unavoidable in every part of life and business management is also not an exception. One of the most widespread solutions is the use of enterprise resource planning (ERP) systems that has proved to support the integration and automation of the processes, the improvement of the performance, and the reduction of costs. Yet, several - mostly small and medium - enterprise cannot afford the time, the uncertainty and the resources that are required by the implementation of an ERP system.
  • Publication
    Open Source ERP
    ( 2011)
    Schatz, Anja
    ;
    Egri, Péter
    ;
    Sauer, Marcus