Semantische Suche

We present a novel approach to assist the modeler in the task of modularization. Our approach addresses the problem from a graphical perspective. The proposed tool support displays a layered structure, where each layer has certain level of abstraction, and allows the modeler to organize metamodels inside the layers. The tool provides the modeler with full control over the modularization process and full knowledge about the relations between the metamodels, thus facilitating the modularization task greatly.

To keep consistency, VITRUVIUS provides a mechanism to define consistency preserving actions for different models. Furthermore, versioning is an important task at developing software. There are various concepts and implementations for the versioning of models, e.g., EMFStore, but none of these are able to guarantee the cross-model consistency provided by VITRUVIUS. Thus, conflicting changes in different models may not be identified as conflicting while merging different branches. In this thesis, an approach is presented that defines a versioning system and preserves the consistency of models of the same system. The approach is based on a graph analysis of the dependency graph of the occurred changes. Besides a requirement relation the dependency graph includes a trigger relation. Afterwards, the two dependency graphs are scanned for a subgraph isomorphism. All changes outside of the isomorphism are potentially conflicting changes. At the manual change resolution, the trigger and the require relation is used to guarantee that a change is applicable and after its application all models are consistent with each other. The approach is illustrated and validated with an application, which combines component-based architectures and class diagrams.

be analyzed by looking into the data which was used for the working process or created during the working process. The main contribution of this work is to extend CoVER in such a way that it supports LIKE predicates with order preserving encryption.

(MDSD) geprägt. Weiterhin ist das Metamodell ein zentrales Entwicklungselement in allen aktuellen MDSD-Projekten. Das Erweitern von Metamodellen wird somit zwangsläufig ein zentrales Thema bei der Weiterentwicklung. Hierbei wird immer mehr darauf geachtet, die Erweiterungen so zu implementieren, dass man sie separieren kann. Da dieser Trend immer stärker zunimmt, keine wissenschaftliche Arbeit gibt, welche die derzeit existierenden Erweiterungsmethoden in EMOF untersucht und bewertet, wird das Thema in dieser Bachelorthesis aufgegriffen. Ziel der Bachelorthesis ist es, eine aktuelle Übersicht über die existierenden Erweiterungsmöglichkeiten zu erstellen, sowie diese zu untersuchen und zu bewerten.

objects for a scenario in the energy market domain. For this purpose we use a scientific workflow management system, namely the Apache Taverna. We will then insure the correctness of the data flow of the process model. The theoretical starting point for this thesis is a verification approach of the supervisors of this thesis. It formalizes BPMN process models by mapping them to Petri Nets and unfolding the execution semantics regarding data. We develop an algorithm for transforming Taverna workflows to BPMN 2.0. We then ensure the correctness of the data-flow of the process model. For this purpose we analyse which compliance rules are relevant for the data objects and how to specify them using anti-patterns.

In our work, we propose measures to analyse the impact of aggregation on clustering and evaluate them experimentally. In particular, we aggregate with standard summary statistics and assess the impact using clustering structure measures, internal validity indices, external validity indices and instance-based forecasting. We adapt these evaluation measures and other data mining techniques to our use case. Furthermore, we propose a decision framework which allows to choose an aggregation level and other experimental settings, considering the trade-off between clustering quality and computational cost.

Our extensive experiments comprise the cross-product of 6 physical attributes, 7 clustering algorithms, 7 aggregation techniques, 9 aggregation levels and 13 time series dissimilarities. We use real-world data from different machines and sensors of a production site at the KIT Campus North, extracting time series of fixed and variable length. Overall, we find that clustering results become less similar the more the data is aggregated. However, the exact effect and value of evaluation measures depends on the type of aggregate, clusteringalgorithm, dataset and dissimilarity measure.

The work’s first part focuses on the binary anomaly detection classification problem and aims to predict an engine’s deficiency status. Here, we manage to recognize more than 90% of the faulty engines. In the second part, we extend our analysis to the multi-class classification problem with high-unbalanced classes. Here, our objective is to forecast the exact type of failure. To some extent, this situation shows similarities with the microarray analysis – we observe high-dimensional data with few instances available. This thesis develops a relevance-driven feature engineering meta-algorithm framework. We study the integration of feature relevance evaluation in the construction process of new features. We also use ensemble feature selection algorithms and define our own criteria to determine the relevance of feature subsets. These criteria are integrated in the feature engineering process in order to accelerate it by ignoring parts of the search space without significantly degrading the data quality.

Wir versuchen die Vorteile beider Ansätze zu verschmelzen, indem im Voraus optimierte Parameterkonfigurationen auf der Zielhardware, sowie unter Umständen mit einer anderen Anwendung, verwendet werden. Wir evaluieren sowohl die Hardware- als auch die Anwendungsportabilität der Konfigurationen anhand von fünf Beispielanwendungen.

Diese Arbeit beschäftigt sich damit unterschiedlich sprachige Korpora vergleichbar zu machen. Darüber hinaus werden erste Ansätze zum Vergleich zeitlicher Entwicklungen zwischen verschiedenen Sprachkorpora gegeben.