36 results about "Theory of evidence" patented technology

The invention discloses a Dempster-shafer (D-S) evidence theory method capable of achieving micro-blog inclusion traffic information fusion. The D-S evidence theory method includes determining an evidence theory identification framework and proposition space according to traffic congestion degrees; capturing micro-blog contents relevant to traffic information themes according to time windows and road sections to form a micro-blog data collection which is required to be fused; pre-processing the micro-blog data collection; calculating word meaning similarity degrees of description vocabularies of micro-blog data collection traffic states, introducing Chinese language corpus resources and improving calculation accuracy of the word meaning similarity degrees; calculating weighting evaluation of the micro-blog word meaning similarity degrees and constructing a basic probability assignment function of an evidence theory; and subjecting a plurality of micro-blog evidence sources to evidence synthesis according to a Dempster combination rule, determining confidence intervals of propositions in the identification space, and selecting a proposition of the maximum confidence function in the confidence intervals to be a fusion result. By means of the D-S evidence theory method capable of achieving micro-blog inclusion traffic information fusion, the fusion of micro-blog inclusion traffic information can be achieved, and an important data source is provided for the city traffic information collection.

The invention discloses a network security situation evaluation method and a network security situation evaluation system for improving the application range and accuracy of network security situation evaluation. The method comprises: classifying all security events in a preset time period according to attack type to form at least one event collection; accumulating the attack risk grades of the security events in each event collection respectively, and determining the accumulated values as the rise degree values of the event collections; substituting the risk degree values of the event collections as independent variables into empirical functions fi() corresponding to the event collections to obtain the values of the credibility of the fact that the event collections render a network in an unsecure state; and using the values of the credibility of the event collections as weights of evidences, combining the weights of evidences by using a synthesis rule of the theory of evidence, and obtaining the credibility of the fact that the network is in an unsecure state in the preset time period. Thus, the technical scheme realizes the quantitative evaluation of the security situation of the whole network and improves the application range and accuracy of the network security situation evaluation.

The invention belongs to the field of technical detection, and in particular relates to a method for predicting the failure of a cone crusher. It is characterized in that the method of fuzzy reasoning is used to increase the anti-interference ability of the fault prediction system, effectively reducing the probability of false alarm and the rate of missed detection; in the fuzzification process, the membership function chooses the combination of triangular membership function and trapezoidal membership function It avoids the unreasonable division of the domain of discourse caused by the simple use of the triangular membership function; the evidence theory is used to fuse the reasoning results so that the diagnosis results can make full use of the information of the crusher and the fault prediction results are more reliable; the classification of the membership degree is 1 or 0 It does not participate in the fusion of evidence theory, avoiding the evidence conflict of evidence theory, thus ensuring the feasibility of the algorithm; introducing the trend information of historical data as auxiliary diagnosis, further reducing the missed detection rate of fault prediction and improving the accuracy of fault prediction The overall level.