Selection model of risk control option based on dominance degree

The one-sidedness in selecting risk control option (RCO) with reference to single index was analyzed, and a multi-index selection model of RCOs based on dominance degree was proposed by considering the ranking and difference degrees of samples on indexes. The model combined the subjective factors of experts and data objectivity by fully employing information contained in data, and highlighted the function of certain index in the ranking of RCOs by adjusting weight vectors. RCOs in formal safety assessment reports on oil tankers and general cargo ships submitted to International Maritime Organization were taken as examples, and the model was applied in RCO optimization. Analysis result shows that the options 2, 5, 6 in example 1 have higher dominance degrees under all weight vectors, and the same is true of options 1, 2, 3, 6, 13 in example 2, and these RCOs are ideal options. The dominance degrees of options in example 2 decrease gradually with the increasing of gross cost of averting a facility (GCAF), and GCAF can be taken as a preferred selection index of RCOs. So the model has higher adaptability.