1. Ph.D. Student, CEC, Napier Univ., 10 Colinton Rd., Edinburgh, U.K.
2. Lecturer, School of Engineering and the Built Environment, Napier Univ., 10 Colinton Rd., Edinburgh, U.K. (corresponding author). E-mail: p.tumula@napier.ac.uk
3. Professor, School of Computer Science, Napier Univ., 10 Colinton Rd., Edinburgh, U.K. E-mail: b.paechter@napier.ac.uk