The Mathematic Method of Membership Conversion from Degree of Coordinates to Degree of Points
In any multi-indexes uncertainty decisions, if choosing membership function to describe the uncertainty of every space-index value about some status, it must meet membership degree conversion, which must solve the conversion from membership degree of coordinates to membership degree of points. But the present methods affect the credibility of result of decision because of the redundant data. So, by mining knowledge information about points’ classification hidden in membership degree of every coordinates, affirming the relation between points’ classification and membership degree of coordinates; eliminating the redundant data in coordinates’ membership for points’ classification by defining distinguishable weight; constructing the mathematic method of conversion from membership degree of coordinates to membership degree of points without the interference of redundant data, providing method basis for solving key computation in multi-indexes uncertainty decisions.
Method of Second Fuzzy Comprehensive Safety Evaluation and Its Application to Oil Depot Safety Evaluation
By analyzing the hierarchy of safety factors in oil depot,they are divided into personnel,equipment,management and environment.After a study of safety index,evaluation methods and fuzzy arithmetic methods for each hierarchy,a for oil depot is built and its evaluating flow is given.During the evaluation,the weight of the factors and each hierarchy is decided by improved analytic hierarchy process(AHP),and the fuzzy operational criterion adopts weighted average method.This model is exemplified in an oil depot,and corresponding safety weakness and countermeasures in this depot are put forward.The result shows that the second fuzzy comprehensive evaluation model can avoid the subjective factors and has a good operability.
Risk analysis and evaluation on investment in high-new-tech project
Based on the character of high-new-tech projects,and the analysis of project evaluation theory and practice of domestic and foreign venture capital,a synthesis judgment system of investment venture in high-tech projects was designed;the application of AHP in investment venture and evaluation was discussed.By using the tool of fuzzy mathematics and demonstration operation,the synthesis judgment was carried out,and the model can be instructive in investment decision of high-new-tech projects.