Reliability Evaluations of a Control System Connected with the Network  
Author Mitsuhiro Imaizumi


Co-Author(s) Mitsutaka Kimura


Abstract As the Internet technology has developed, not only the information system but also the control system which controls various devices have become connected with the Internet. The operational efficiency of a control system is improved by being connected with the Internet. However, it increases the risk of cyber attacks. Meanwhile, in terms of the control system, the real-time property which guarantees response within strict time constraints is required. This paper considers the optimal policy of a control system connected with the network. The control system consists of N units. If cyber attack cannot be detected, the system becomes failure. If the N-th operating unit cannot finish one processing until a time limit T, a processing of system interrupts. The mean time to system failure or interruption is derived. Further, the optimal policy which minimizes the cost effectiveness is discussed. Finally, numerical examples are given.


Keywords Security, Control system, Markov renewal process, Optimal policy
    Article #:  2136
Proceedings of the 21st ISSAT International Conference on Reliability and Quality in Design
August 6-8, 2015 - Philadelphia, Pennsylvia, U.S.A.