1. Department of Applied Computer Science, Catholic University of Eichstäatt-Ingolstadt, Germany. E-mail: {robin.bergenthum,sebastian.mauser}@ku-eichstaett.de
2. Department of Applied Computer Science, University of Augsburg, Germany. E-mail: robert.lorenz@informatik.uni-augsburg.de
3. Faculty of Electrical Engineering and Information Technology, Slovak University of Technology Bratislava, Slovak Republic. E-mail: gabriel.juhas@stuba.sk Abstract