TADESSE TAREKE.pdf - Addis Ababa University

Acknowledgments
There are a lot of people whose participations made the completion of this thesis
possible. First of all, I can never adequately express my appreciation to my advisor,
Dr. Yirsaw Ayalew, whose tireless support, encouragement, and tactful guidance
made all the difference. Without his leadership and teamwork, none of this would have
been attempted.
I am also very much indebted to my beloved family members for their love, patience,
and support during the last two solid years. I would also like to thank Ethiopian Airlines
Enterprise for granting me the scholarship award to attend this M.Sc. program.
A very special thank you for the following people who directly or indirectly contributed
to this research work is appropriate. From Ethiopian Airlines: Ato Mesfin Tassew, Ato
Kassahun H/Gabriel, Ato Berhanu Bizualem, Ato Moges Delelegn, Ato Daniel Abebe,
Ato Alemayehu Assefa, Ato Tariku Molla, Ato Getachew Teshome, Mr. Hakan Bali,
Ato Negassi Dirar, W/t Bethelehem Mengistu, Ato Berhanu G/Tekel, Ato Wondwossen
Hailu, Ato Benyam Ayalew, Ato Theowodros Alemgenet, Ato Theowodros Asnake,
W/ro Wubit Tesfaye, W/ro Almaz Tsegaye, W/ro Aster Fisseha, Ato Tensayberhan
Teketel, Ato Tesfaye Yimer, Ato Getinet Tadesse, Ato Getahun Negatu, Ato Enkubahri
Tsehai, and Ato Abdulhakim Meftuh. From my AAU colleagues: Ato Fikre Lema, Ato
Semahegn Abebe, and W/t Addisalem Negash. From Cybersoft: Ato Tekesteberhan
Habtu, Ato Mesfin Mulugeta, and Ato Assefa Dagne. From other places: Dr. Daniel
Asrat, W/ro Meliha Mohammed, and Ato Zelalem Sintayehu.
Very heartfelt, sincere and special thanks to all of you for helping me in any kind to
achieve this goal.
Above everything else, I praise God for His love, care, and incredible support in
attaining this achievement!