Lars Gräning

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To reduce the number of expensive fitness function evaluations in evolutionary optimization, several individual-based and generation-based evolution control methods have been suggested. This paper compares four individual-based evolution control frameworks on three widely used test functions. Feedforward neural networks are employed for fitness estimation.(More)
To reduce the number of expensive fitness function evaluations in evolutionary optimization, individual-based and generation-based strategies for metamodel management (evolution control) have been proposed. In this work, four individual-based frameworks for meta-model management are investigated. A feedforward neural network is employed to construct an(More)
Several heuristic methods have been suggested for improving the generalization capability in neural network learning, most of which are concerned with a single-objective (SO) learning tasks. In this work, we discuss generalization improvement in multi-objective learning (MO). As a case study, we investigate the generation of neural network classifiers based(More)
Although the integration of engineering data within the framework of product data management systems has been successful in the recent years, the holistic analysis (from a systems engineering perspective) of multi-disciplinary data or data based on different representations and tools is still not realized in practice. At the same time, the application of(More)
Wide exploration of high-dimensional, multimodal design spaces is required for uncovering alternative solutions in the conceptual phase of design optimization tasks. We present a general framework for balancing exploration and exploitation during the course of the optimization that induces sequential exploitation of different optima in the search space by(More)
During CAD development and any kind of design optimisation over years a huge amount of geometries accumulate in a design department. To organize and structure these designs with respect to reusability, a hierarchical set of components on different scalings is extracted by the designers. This hierarchy allows to compose designs from several parts and to(More)
We propose methods that allow the investigation of local modifications of aerodynamic design data represented by discrete unstructured surface meshes. A displacement measure is suggested to evaluate local differences between the shapes. The displacement measure provides information on the amount and direction of surface modifications. Using the displacement(More)