Affiliation: | 1. Faculty of Electrical Engineering and Computer Science , University of Maribor , Smetanova ulica 17, 2000, Maribor , Slovenia janez.brest@uni-mb.si;3. Computer Systems Department , Jo?ef Stefan Institute , Jamova cesta 39, 1000, Ljubljana , Slovenia;4. Faculty of Electrical Engineering and Computer Science , University of Maribor , Smetanova ulica 17, 2000, Maribor , Slovenia |