Fig 1.
The picture of the PSA technology in the hospital.
Table 1.
Risk assessment matrix [28].
Fig 2.
Relationships between crisp, fuzzy, and intuitive fuzzy values.
Fig 3.
TIFN membership and non-membership function.
Table 2.
Linguistic values and the parameters of membership and non-membership functions of TIFNs for two input variables: Severity and probability.
Table 3.
Linguistic values and the parameters of membership and non-membership functions of TIFNs for the output variable and risk level.
Fig 4.
The membership curve plots of TIFNs for two input variables: Severity and probability and the output variable: Risk level.
Fig 5.
The non-membership curve plots of TIFNs for two input variables: Severity and probability and the output variable: Risk level.
Fig 6.
The 3D surface plot of the output variable: Risk level, versus the two input variables: Probability and severity.
Fig 7.
Flowchart of hospital concentration system and node made based on HAZOP method.
Table 4.
The information about the deviations in the PSA system (Based on the causes).
Fig 8.
Relative abundance distribution of risk level of deviations detected in conventional (C) and fuzzy approach (IF).
Table 5.
Frequency distribution of risks in conventional and intuitive fuzzy HAZOP approaches in three nodes.
Table 6.
Four critical deviations in the conventional (C) and fuzzy (IF) approaches in the PSA system.
Fig 9.
Relative frequency of risk level of deviations detected in convectional and fuzzy approach.