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With the completion of this thesis, a large chapter of my life is coming to a close. Firstly, I would like to thank my supervisor Professor Christophoros Nikou for his seamless cooperation, his continuous support, his guidance, and most importantly, his caring nature for me not only as his student, but also as an individual. I would also like to deeply thank Dr. Basilis Gatos for the opportunity he gave me to work at his lab. His understanding of my abilities and flaws, significantly affected me to improve my general mindset. Moreover, I would like to thank Dr. Vasilis Katsouros for his excellent cooperation from the beginning of this journey. His crucial interventions made me realize that early prioritization gets actual results. I can not forget the flawless communication I had with Professor Konstantinos Βlekas, regrading my academic obligations, as well as his sincere interest for my improvement as a researcher, sharing important ideas and thoughts that I respect and wish to follow. Furthermore, I would like to thank Professor Aristeidis Lykas for his priceless academic advice that helped me realize my goal. Also, I would like to thank Assistant Professor Michalis Vrigkas and Professor Lysicmachos Kontis for their cooperation as well as the necessary distractions their company offered me during extracurricular activities. I could also not forget to thank Dr. Giorgos Sfikas for our exceptional cooperation during all these years, which I wish it will continue. Finally, I would like to thank my family who above all, were there for me and gave me the courage to carry on, no matter what the circumstances. Especially, I would like to thank my brother George whom I deeply love …