x i j

b i

Δ θ i j

S ( α i j , β i j )

α i j β i j > 0

α i j β i j < 0

α i j = 0

β i j = 0

0

0

θ 1 j = 0

0

0

θ 2 j = 0

0

1

θ 3 j = 0

+1

−1

0

±1

0

1

θ 4 j = 0

−1

+1

±1

0

1

0

θ 5 j = 0

−1

+1

±1

0

1

0

θ 6 j = 0

+1

−1

0

±1

1

1

θ 7 j = 0

1

1

θ 8 j = 0