challenging topic, and for being always able to help when I needed. Thanks to Steve Dick for his ... more challenging topic, and for being always able to help when I needed. Thanks to Steve Dick for his help in the configuration and adjustments of the clusters I used in most of the simulations. Thanks to the Institute of Simulation and Training IST at UCF for supplying a very important CPU time used in some simulations and in many testing runs. Thanks to my family for their permanent support, in the good and in the bad times. Thanks to my brother, Dr. Patricio Vidal for his advising in the topic of software engineering and development. I want to express especial thanks to all nurses, doctors, technicians and professionals of Winter Park Memorial, Florida Hospital at Sebring and Tampa General Hospital for their dedication in their effort of saving my life. Thanks particularly to doctors Anil Kumar (CFCG) and Siva Kumar (TGH) for their help during my health crisis and their continuous concern. I want to thank particularly Dr. Kathy H Lee (Florida Hospital at Sebring) for taking the key decision that saved my life. To all of you, thank you very much. vi
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