Dedicated to

I want to dedicate this hard work to all my family and the people that supported me when I began this career. To my mother Cecilia who because of her advises and her perseverance, I am who I am. She is my light my friend and my motivation to continue and be better always. To my grandfather Guillermo who is my angel, he always gave me advises about the adversities of life. To my brother Juan Carlos that helped in every thing that I needed in the good times and always in the bad times. And finally to my father Juan Carlos, whose support gave me the education and his advises were focused to get the goals that I wanted. Thanks To my mother She showed me every single detail of life, to love, to take care of myself, she always said “You have to point always to the top, and have goals every year of your life, you never have to give up, because if you give up you're practically death”, she has always been with me unconditionally. This thesis is for you, is the end of a goal, A goal that you help me finish. To my Grandfather He taught me all the things that I know, the good things were his priorities, he loved live and for that reason he was one of the most important inspirations, since when I was a child to these days. To my angel up there in the universe. To my brother Because he have always been giving me advises whenever I needed, Thank you for all your support in my career and in my life. To my father You pushed me until I finished my career, and I am very thankful because of that I am getting my degree. Thank you for been with me all this years. To Pablo You always thought that I could do better every day since we are together. You were an essential part of this thesis, you supported me when I thought there were no solutions, helping me finding something new, I am thankful with you because there where days and nights that you stayed with me studying and making me learn more things. To my teachers and friends For giving me all the good moments that I will never forget and all your energy for this thesis. To my Aunt Mony and my Uncle Cris That always where there giving me advises and helping me in everything I do, in the good moments and also in the bad moments of life