22 NN ∑aN-M∑ ap,∑a1O N~MQσ ∑N 2 O x N 2 2 2 n2 Ln2( ) ( ) ( ) ( ) F Z Z Z Z t N N N N a N a a n n n n n n n n i i i n i i i i i i i i i i n n F n Z N t N Z N N N 1, 2 2 2 1 1 2 2 2 2 1 1 2 2 2 1 2 2 1 2 2 2 ~ 4. ~ , ~ ~ 3. ~ 0, ~ 2. ~ 0, ~ 1. ~ , ~ ,  =  =       = =          