1. OFFIS Institute for Information Technology and Carl von Ossietzky University of Oldenburg,Energy Informatics,Oldenburg,Germany
2. Institute for the Protection of Maritime Infrastructures, German Aerospace Center (DLR),Bremerhaven,Germany
3. OFFIS Institute for Information Technology,Energy Informatics,Oldenburg,Germany
4. Carl von Ossietzky University of Oldenburg,Informatics Department,Oldenburg,Germany