فهرست مطالب mohammad vaezinejad

This research focuses on studying computer games industry in Iran. Attempts have been made to analyze the problems of this industry to pathologically study and identify hurdles in the way of its growth. Hence, after reviewing the related literature in the field of system theories, game industry and its condition in Iran are briefly introduced. In the next step, the viewpoints of experts of this field were collected through qualitative methods such as interview and Delphi technique and through factor analysis eleven problems of this industry in internal and external environments were identified.

In designing the landing gear of an airplane, one of the most important factors to consider, is the effect of landing airplane on body, and the role of shock absorber as an energy absorber resulting from landing. In this thesis, the landing gear of airplane has been analyzed using two approaches namely theoretical and simulation software. First, dynamic equations of landing airplane were investigated in six degrees of freedom and then, these equations were converted into space state and consequently solved using MATLAB software. In second approach, the airplane was modeled in ADAMS and different states of landing such as landing with two wheels, landing with three wheels, passing over a bump and taxi were compared and analyzed. Finally, using the above approaches velocity and displacement of airplane mass center were investigated, discussed and compared.