1. School of Computer Science and Electronic Engineering Bangor University Dean Street Bangor Gwynedd LL57 1UT UK
2. Faculty of Materials and Chemical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Topi Khyber Pakhtunkhwa 23640 Pakistan
3. School of Non‐destructive Testing National Research Tomsk Polytechnic University Lenin Avenue, 30 Tomsk 634050 Russia