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Heterotic orbifolds provide promising constructions of MSSM–like models in string theory. We investigate the connection of such orbifold models with smooth Calabi-Yau compactifications by examining resolutions of the T 6 / 6–II orbifold (which are far from unique) with Abelian gauge fluxes. These gauge backgrounds are topologically characterized by weight… (More)
Massive Multiuser Virtual Environments (MMVEs) have grown to a huge industry in recent years. They allow for simultaneous activity of thousands of players in a virtual world. Distributed event-based systems are a promising approach to reach both performing and scalable architectures. The potential of these architectures can only be fully exploited if event… (More)
In order to enable proper system and integration testing, it is often necessary to have huge test data inventories, reflecting the heterogeneous live system. Although the maintenance of large data stores can be guided by advice obtained from data quality evaluations, this technique can be only partly applied to test data inventories. Assessing test data… (More)
The <i>Massive Multiuser Event InfraStructure</i> (M<sup>2</sup>etis) project is aimed at a generic middleware that supports the optimization of event dissemination based on a multidimen- sional semantic classification of event types. In this paper, we introduce the M<sup>2</sup>etis system architecture with its core concepts.