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An extended notation of FTA for risk assessment of software-intensive medical devices
Yoshio Sakai, Seiko Shirasaka and Yasuharu Nishi
It is difficult to assess the risk of software-intensive medical devices. An extended notation of FTA recognizes the risk class before and after the risk control measure and the software in the system affects the top event of FTA.
You can see this content as 6-pages paper from IEEE Website.