Ph.D. Tezi Görüntüleme

Student: Nurgül OKUR BEKAR
Supervisor: Prof. Dr. İhsan ÜNVER
Department: Matematik
Institution: Graduate School of Natural and Applied Sciences
University: Karadeniz Technical University Turkey
Title of the Thesis: Investigation of the Renewal Reward Processes by Asymptotic Methods
Level: Ph.D.
Acceptance Date: 3/2/2012
Number of Pages: 93
Registration Number: Di885
Summary:

       In this thesis, semi-Markov, a model called as “The renewal reward processes”, is considered and the stochastic process expressed by this model is constructed mathematically. Then, the boundary functionals, the ergodicity, the ergodic distribution function and the ergodic moments of this process thoroughly investigated in a few sections.

Mentioned in sections, the first four initial moments of the boundary functionals, the ergodic distribution function and the ergodic moments of the process is expressed by means of a renewal function, the exact and asymptotic results for these are obtained.

       Besides, the exact and asymptotic results are obtained for the first initial moments of the boundary functional of the renewal reward processes with gamma and Weibull interference of chance. Using these results, the first four central moments and asymmetry-symmetry coefficients of the boundary functionals of the mentioned processes are given asymptotically. Furthermore, the ergodicity of these processes is proved, the exact and asymptotic results are obtained for the ergodic distribution function and the ergodic moments, and the weak convergence theorem is obtained for the ergodic distribution function of these processes. In addition, by means of the obtained asymptotic results, the simulation results are given for the moments of the representing interference time boundary functional of the renewal reward and the ergodic distribution function of the renewal reward processes with gamma and Weibull interference of chance.

      

Key Words: Renewal reward process, Boundary functional, Moments, Asymmetry- symmetry coefficients, Ergodicity, Asymptotic expansion, Simulation, Weak convergence.