40 3. HOW SOCIAL CONTEXT HELPS
            
       
f .c
i
; c
j
/ D
.1/
b
D
JS
.p
ik
jjp
jk
/ C 1
;

 b        b D 0  c
i
 c
j
    
b D 1
Propagating Credibility Values
                 
            
           
          T D fo.c
1
/; o.c
2
/; :::; o.c
n
/g 
o.c
i
/       c
i
   W 2 R
nn
 W
ij
D f .c
i
; c
j
/
   viewpoint    c
i
 c
j
     
           
        
Q.T/ D
n
X
i;j D1
jW
ij
j
0
B
@
o.c
i
/
p
N
D
ii
e
ij
o.c
j
/
q
N
D
jj
1
C
A
2
C .1 /kT T
0
k
2
;


N
D     
N
D
ii
D
P
k
jW
ik
j  e
ij
D 1  W
ij
0  e
ij
D 0
            
            
             
        G
C
    
   
T
D 
T
Q.T/: 
        T       
  T.t/ D HT.t 1/ C .1 T
0
/  H D
N
D
1=2
W
N
D
1=2
  
               
      
3.3 NETWORK-BASED DETECTION
           
              
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