Subproject M1: Structured GNL models and efficient simulation
The DFG-funded Collaborative Research Center (SFB) 559 pursues the goal of supporting the planning, realization and operation of large-scale networks in logistics (GNLs). The support is to be achieved by way of model-based assessment and evaluation of GNLs. As a framework paradigm for modeling, process chains are to be used as a matter of priority. In this subproject, the process chain paradigm will be extended and specified in such a way that, in addition to the usual technical performance variables (such as throughput, inventory, on-time delivery), economic and ecological aspects can also be evaluated. Furthermore, this subproject aims at making such extended process chains accessible to an efficient simulative investigation. For this purpose, suitable decomposition and aggregation approaches and their usability for the development of efficient simulation methods will be investigated.
Subproject M2: Efficient analysis methods
In the field of computer science, highly efficient non-simulative analysis methods are known for certain paradigms. The use of such methods is especially suitable for the design-accompanying rough exploration of GNLs. The aim of this subproject is the transfer and necessary adaptation or extension of these analysis methods for GNLs. The methods include traditional techniques from queueing theory (e.g. product form solutions), numerical techniques for the analysis of stochastic processes, as well as recently developed forms of structured Markov chain analysis for hierarchical models.