• Age replacement models: A summary with new perspectives and methods 

      Zhao, Xufeng; Al-Khalifa, Khalifa N.; Hamouda, AbdelMagid; Nakagawab, Toshio ( Elsevier Ltd , 2017 , Article Review)
      Age replacement models are fundamental to maintenance theory. This paper summarizes our new perspectives and hods in age replacement models: First, we optimize the expected cost rate for a required availability level and ...
    • Three maintenances for age replacement policies 

      Zhao, Xufeng; Al-Khalifa, Khalifa N.; Qian, Cunhua; Nakagawa, Toshio ( International Society of Science and Applied Technologies , 2017 , Conference Paper)
      Preventive replacement policy conducted at a routine time T* has been surveyed extensively in literatures. Another two random replacement times Y1 and Y2 are jointly considered in this paper. We formulate the models of ...