Research Article

Assessment of Equipment Operation State with Improved Random Forest

Table 6

Definition of all the symbols used in the paper.

: front bearing temperature: indicator function
: rear bearing temperature: 5 number of nearest neighbor samples
: cooling water inlet temperature: the number of attributes
: winding temperature: the number of optimal attributes
: winding temperature: Matthew correlation coefficient
: winding temperature: average of
: winding temperature: the number of data sets
: winding temperature: the number of decision trees
: winding temperature: new samples
: classification accuracy: , probability that the sample contains the attribute
: average of : probability of being in degree
: the th decision tree: the number of data sets not extracted
: state degree: the number of incorrect classification from data sets not extracted
: state degree at time : time
: error rate of classification: , weight for the th decision tree
: false positive: data value of generator at time
: false positive: , the number of samples classified correctly for the th tree
: harmonic average of minority class accuracy and recall: the number of pretested sample
: average of : some sample
: Gini index: samples are randomly selected from nearest neighbor samples
: geometric average correct rate: random number between (0,1)
: average of : true positive
: comprehensive assessment result: true positive
: , assessment result of th decision tree: the corresponding category