37 results about "Fuzzy vector" patented technology

The invention discloses a fuzzy data mining based automatic classification method of Chinese web pages. A classification word description library construction part, a new web page preprocessing part, a fuzzy classification matcher part and a classification result fuzzy judgment part are provided in the method. By applying a method of fuzzy comprehensive judgment, the fuzzy classification operation is carried out on a training set characteristic word vector fuzzy matrix generated when a classification word description library is constructed and a web page characteristic word fuzzy vector generated by the new web page preprocessing part, and finally the fuzzy classification of the Chinese web pages is obtained through classification result fuzzy judgment. The method can effectively improve the classification efficiency and solve the classification fuzziness problem and has favorable expandability, simple and convenient operation and easy popularization.

The invention discloses a fuzzy control-based oil well paraffin removal method and system. The method includes the following steps that: input variables are determined, wherein the input variables comprise a paraffin precipitation deviation value and a time deviation value; and the input variables are fuzzified with a language variable, so that fuzzy input variables are obtained; the fuzzy input variables are inputted into a fuzzy controller, a fuzzy vector is determined according to a fuzzy control rule; the fuzzy vector is defuzzicated, so that a fuzzy output quantity can be obtained; and the second-stage-fire time and three-stage fire time of oil well paraffin removal are determined according to the fuzzy output quantity and on the basis of a second-stage-fire time adjustment rule anda three-stage fire time adjustment rule. With the method and system of the invention adopted, high-efficiency well washing can be realized, yield can be increased, and oil extraction energy consumption can be reduced.

The invention relates to a coincidence rate determining method and system of a really drilled well and a designed well belonging to the petroleum and natural gas drilling technical filed. The method comprises following steps: determining comparison items and element values thereof of the really drilled well and the designed well according to drilling engineering design and real drilling data; setting weight values according to the significances of the comparison items; calculating and evaluating item element subordinating degrees through a subordinating degree function and constructing fuzzy vectors; calculating the close degrees of the fuzzy vectors of corresponding comparison items; and calculating the total close degree of the comparison items according to the weight values of the comparison items in an item weight module. According to the method and the system of the invention, the coincidence rate of the really drilled well and the designed well is described according to the close degrees of the fuzzy vectors; the evaluation quantification is realized; the artificial subject judgment is reduced; the evaluation is more scientific; and the method and the system have very important significance in drilling post-evaluation.

The invention belongs to the evaluation technical field, and particularly relates to an improved water environment safety evaluation analysis method. The improved water environment safety evaluation analysis method includes the steps of based on the relation of interaction between influence factors, based on the combination of the improved network analysis method and fuzzy mathematics, mainly on the basis of building system network analysis, carrying out pairwise comparison on the influence factors under different criterions, obtaining weight vectors comprising the interaction, combining fuzzy vectors obtained through the fuzzy evaluation method to carry out calculation and analysis, and finally obtaining the safety evaluation results. The improved water environment safety evaluation analysis method is accurate in evaluation result, improves the pre-alarm accuracy, achieves the aim of building a water quality safety evaluation model, increases the time correction value and ensures that the weight vectors can accurately and always reflect the relative importance degrees between the influence factors at different moments.

The invention relates to a method for evaluating the coincidence rate of an actual drilling borehole trajectory and a design track, and belongs to the technical field of petroleum and gas drilling. The method comprises the steps that the actual drilling borehole trajectory and the design track are unified to a coordinate system by measuring the well mouth coordinate and altitude of the actual drilling borehole trajectory; then the well depth, well deviation and orientation of the actual drilling borehole trajectory are measured, the vertical depth, east-west coordinate and north-south coordinate of an actual drilling well are figured out and standardized to be fuzzy vectors, the close degrees between the fuzzy vectors of the vertical depth, east-west coordinate and north-south coordinate of the actual drilling well and the fuzzy vectors of the vertical depth, east-west coordinate and north-south coordinate of the corresponding design borehole track is calculated, finally, the average value of the close degrees is figured out, and the average close degree is used for evaluating the coincidence rate of the actual drilling borehole trajectory and the design borehole track. By means of the method, quantitative judgment is achieved, human active factors are overcome, and the coincidence rate of the actual drilling borehole trajectory and the design track is objectively reflected.

The invention discloses an assessment method of pile sinking of ocean platform taking consideration of risk level classification. The method includes the following steps: classifying risk levels of pile sinking; establishing a system of assessment indexes and classifying the risk levels for all the assessment indexes, confirming the comparison matrix and using the average and range method to construct the judgment matrix to determine the weights of all the assessment indexes, determining the membership grade of each risk level for each assessment index, establishing a fuzzy mathematical model to solve the fuzzy vector of the pile sinking risk level for the ocean platform and based on the principle of the largest membership grade making the assessment about pile sinking risk level of the ocean platform. The invention provides an assessment method based on AHP and fuzzy mathematical theory, applies the method of risk levels classification to give an assessment to the pile sinking of ocean platforms. The assessment results are more close to the actuality. The method is suitable for the assessment of pile sinking risks of ocean platforms.

The invention provides a fuzzy vector morphological filtering method based on hypercomplex description. The method includes the steps of carrying out hypercomplex description on each pixel of a color image to obtain three components representing pixel features, carrying out opening operation and closed operation on each pixel in the image in sequence and then obtaining a filtered image. According to the fuzzy vector morphological filtering method based on the hypercomplex description, hypercomplex numbers are utilized to describe the color image, a fuzzy lexicography sequence is led in, and consequently the fuzzy vector morphological filtering method has good recovering effects on the color images which are polluted by impulse noise.

The invention relates to a power grid operation safety risk evaluation method. The method comprises the following steps: an evaluation index set and a comment set are determined; a fuzzy relation matrix for secondary indexes in the evaluation index set is built; weights of primary indexes and secondary indexes are determined respectively, and weight vectors of the primary indexes and the secondary indexes are obtained respectively; the product of the weight vectors of the secondary indexes and the secondary index fuzzy relation matrix is calculated, and a comprehensive evaluation fuzzy vector of the primary indexes is obtained; and the product of the comprehensive evaluation fuzzy vector of the primary indexes and the weight vectors of the primary indexes is calculated, a power grid operation risk comprehensive evaluation vector is obtained, and the grade of a comment corresponding to the maximum value in the power grid operation risk comprehensive evaluation vector is regarded as a final evaluation result. The safety risk evaluation accuracy and the objectivity can be improved, and safe and stable operation of the power grid are ensured.