As illustrated in the FT diagram, there are twenty-one BEs and five intermediate events (IE) described. Table 3 shows the operational faults related with severe head injury accident during ship mooring operation. Since there is lack of failure data in maritime industry, the fuzzy sets are employed to obtain failure rates. When one of BE evaluated as very unlikely by experts this evaluation means that the effect of BE is insignificant for occurrence of TE. The linguistic expression of marine experts can be converted into fuzzy numbers (Sahin, 2017). In this context, Fig. 3 shows fuzzy rating and membership functions and Table 4 depicts linguistic terms and trapezoidal fuzzy numbers of possibilities (Chen and Hwang, 2015). Chen and Hwang (2015) developed a numerical approximation method where standardized seven linguistic scales {Very Low (VL), Low (L), Mildly Low (ML), Medium (M), Mildly High (MH), High (H), Very High (HV)} were introduced. These numerical scales are capable of transforming linguistic expression of experts into fuzzy numbers to estimate possibility. Conversion scale for linguistic variables (i.e. Linguistic terms and trapezoidal fuzzy numbers of possibilities) shown in Table 5 (Baas and Kwakernaak, 1977; Chen, 2015).
As illustrated in the FT diagram, there are twenty-one BEs and five intermediate events (IE) described. Table 3 shows the operational faults related with severe head injury accident during ship mooring operation. Since there is lack of failure data in maritime industry, the fuzzy sets are employed to obtain failure rates. When one of BE evaluated as very unlikely by experts this evaluation means that the effect of BE is insignificant for occurrence of TE. The linguistic expression of marine experts can be converted into fuzzy numbers (Sahin, 2017). In this context, Fig. 3 shows fuzzy rating and membership functions and Table 4 depicts linguistic terms and trapezoidal fuzzy numbers of possibilities (Chen and Hwang, 2015). Chen and Hwang (2015) developed a numerical approximation method where standardized seven linguistic scales {Very Low (VL), Low (L), Mildly Low (ML), Medium (M), Mildly High (MH), High (H), Very High (HV)} were introduced. These numerical scales are capable of transforming linguistic expression of experts into fuzzy numbers to estimate possibility. Conversion scale for linguistic variables (i.e. Linguistic terms and trapezoidal fuzzy numbers of possibilities) shown in Table 5 (Baas and Kwakernaak, 1977; Chen, 2015).
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