Institut für Programmstrukturen und Datenorganisation


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Fr, 03.03.2017 Herr Zengchao Geng (Masterthesis) ID: 100276
Co-Evolution of Metamodels and Database-stored Instances
Betreuer: Jörg Henß
Model-Driven Engineering (MDE) changes the focus of the software development from coding to modeling. As the large models cannot be loaded into memory, they should be persisted into database. Changing requirements and detection of bugs often lead to new metamodel versions. When the metamodel evolves, database-stored instances that previously conformed to the metamodel might no longer conform to the new structures and constraints designed by the changed metamodel. Manually migrating the existing instances in database is tedious and error-prone. The concept of operations mapping and translation strategies are proposed in this thesis. Operations mapping means the mapping between the operations of metamodel evolution and the operations of database refactoring. Through the investigation of the operations mapping, the translation strategies are generated to translate the history file of Edapt into ChangeLog file of Liquibase and to make sure the automatically co-evolution of metamodel and database-stored instances.

Fr, 10.03.2017 Herr Andreas Schatz (Proposal) ID: 100277
Studying the Placement of Outliers Hidden in Subspaces to Prevent Catastrophic Failures or Sabotage
Betreuer: Georg Steinbuß
In this proposal talk we will discuss the problem of generating realistic hidden outliers. High dimmensional data poses problems in detecting outliers, because of the curse of dimensionality. One way to circumvent this is to restrict attention to lower dimensional projections. In some of these subpsaces the outlier can be detected, while in others it will appear like an ordinary data point and is thus hidden. We will also discuss how expert constraints on these outliers can be taken into account.