.
- 䳺 . , 㳿 , .
1956 . , . . " The Role of Air Freight in Physical Distribution " (" ") , , , . , , , . , ( ) .
, . : ( ), ( ), . 㳿 , .
, . : ; . , ᒺ .
ᒺ - [60]. :
n k
= ΣPi+ ΣPj, (1.1)
|
|
i = 1 j = 1
Pi ᒺ ;
n ;
Pj ᒺ ;
k ;
i = (1, 2, , n); j = (1, 2, , k).
ᒺ , i :
i = f(Ri, Di 1, Di 2, Ki, Si), (1.2)
Ri ;
Di 1, Di 2 ;
K i ;
Si .
ᒺ , j :
i = f(ji, Mj, Dj 1, Dj 2, Ki, Si), (1.3)
Ri ;
j ᒺ ;
Dj 1, ji 2 ;
Ki ;
Si - .
, . . , - .