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Acknowledgements First of all, I would like to express my warmest thanks to my Local Supervisor professor Dr. Evangelos Kokkinos for his support and guidance in my whole effort. He has provided me with invaluable advice and motivation throughout my MPhil at Brunel University and without his assistance this thesis would not have been possible. Furthermore, I would like to thank my Supervisor professor Dr R. Nilavalan(Nila) for his understanding and patient throughout this thesis