Patent ID: 11938784
Assignee: CENTRAL SOUTH UNIVERSITY
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 4:
5. The health protection method for passengers on a train in a polluted indoor environment according to claim 4, wherein the step of analyzing and calculating the self-relevance of the indoor pollutant data information of the train in the step c is, specifically, to analyze the self-relevance in the following steps:
(1) calculate, by using the following equation, mutual information between every two of all air pollutants inside the train:, M
   ⁢
   
    I
    ⁡
    (
    
     
      a
      i
     
     ;
     
      b
      j
     
    
    )
   
  
  =
  
   
    
     ∑
     
      A
      ∈
      
       a
       i
      
     
    
    
     
      ∑
      
       B
       ∈
       
        b
        i
       
      
     
     
      
       P
       ⁡
       (
       
        A
        ,
        B
       
       )
      
      ⁢
      log
      ⁢
      
       
        P
        ⁡
        (
        
         A
         ,
         B
        
        )
       
       
        
         P
         ⁡
         (
         A
         )
        
        ⁢
        
         P
         ⁡
         (
         B
         )
        
       
      
     
    
   
   =
   
    
     H
     ⁡
     (
     
      a
      i
     
     )
    
    -
    
     H
     ⁡
     (
     
      
       a
       i
      
      |
      
       b
       i
      
     
     )
    
   
  
 

wherein, MI(ai; bi) is a result of mutual information between a pollutant a and a pollutant b; a sequence of the pollutant a is recorded as {ai|i=1, 2, . . . , X}, and a sequence of the pollutant b is recorded as {bi|i=1, 2, . . . , X}; P(A, B) is a joint probability distribution function of random variables ai and bi, P(A) is a marginal probability distribution function of ai, P(B) is a marginal probability distribution function of bi, H(ai) is a marginal entropy, and H(ai|bi) is a conditional entropy;
(2) construct, according to the mutual information between every two of all air pollutants calculated in the step (1), mutual information sets of the pollutants; and
(3) select, for each pollutant, a plurality of groups of pollutants with maximum mutual information of the pollutant, wherein the selected plurality of groups of pollutants have a strongest relevance.