Thomas Brenner

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OBJECTIVE The purpose of this study was to compare permeability measurements in high-grade and low-grade glial neoplasms using a T2(*)-weighted method. Our hypothesis was that permeability measurements using a T2(*)-weighted technique would show permeability in high-grade neoplasms to be higher than that in low-grade neoplasms. MATERIALS AND METHODS(More)
Network theory is rapidly changing our understanding of complex systems, but the relevance of topological features for the dynamic behavior of metabolic networks, food webs, production systems, information networks, or cascade failures of power grids remains to be explored. Based on a simple model of supply networks, we offer an interpretation of(More)
The paper explores the implications of melioration learning—an empirically significant variant of reinforcement learning—for game theory. We show that in games with invariable pay-offs melioration learning converges to Nash equilibria in a way similar to the replicator dynamics. Since melioration learning is known to deviate from optimizing behavior when an(More)
Local industrial clusters have attracted much attention in recent economic and geographic literature. The focus has been on identifying the conditions for the emergence of such clusters. Here the long-term implications of local industrial clusters are studied. To this end, we examine German regions where those that contain long-existing industrial clusters(More)
We have designed and tested a compact flip-chip assembly that combines the photonic and electrical functionality of a Silicon Photonic modulator and a SiGe BiCMOS MZM-driver. This forms a basis for low-cost advanced optical transceivers.
When advising policy we face the fundamental problem that economic processes are connected with uncertainty and thus policy can err. In this paper we show how the use of simulation models can reduce policy errors. We suggest that policy is best based on socalled abductive simulation models, which help to better understand how policy measures can influence(More)
This paper discusses several features of knowledge that are often considered crucial for characterizing the economic significance of knowledge: whether it is overtly accessible or tacit, whether it can be or is encoded or not, and whether it has public or private good character. It is argued that all these features depend similarly on the state of the(More)