( ,1978 )( ,1978 )( ,1978 )( ,1978 )
44
4
433
3
2 3
2
12
111
0
1
5
(S40 )
10
20
30
40
50
60
70
80
90
6
7
15
25
cm/s
Vg/Vw 1/3.316cm/s > 12.9cm/s
54cm/s > 42.3cm/s
30mm
D
°
[ No.2][ No.1]
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