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=Θ
Θα
∈
Θα Θ
Θα
Θ
Θ
Θ ∪= ΘΘ
1421
1-4244-0737-0/07/$20.00 c©2007 IEEE
=
=
δ
=∈=∈
−+−=ε
≥ =∈∀
+≥+ =∈∀
+≤≤∈
≤
+= =∈∀
=∈∈+∀≥+
∈∀≥
=∈∀≤−≤ + δ
φ=∩∩∩
=∪∪∪
1422 2007 Second IEEE Conference on Industrial Electronics and Applications
δαΘ+ Θ=Θ
+Θ
Θ Θα
Θ
=
∈∀=
∪= ΘΘ + δ
Θα
+Θα
δ
δ
=∈ΘΘ −=+ααδ
=−= +
=+ −−= δ
=+≥+
=∈∈+∀≥+
Δ
∈∈
−−=Δ
∈∀<∧≤
=
λ
θ
λθ −=
∈
∈∈
≤≤
=
2007 Second IEEE Conference on Industrial Electronics and Applications 1423
Φ Φ
Φ
δ
Φ =δ
φ≠
φ= Φ
Δ
>Δ
δ Φ δδ < Φ=Φ
δδ = Φ
+= > =δ
Φ
μ
π
μ π δ
1424 2007 Second IEEE Conference on Industrial Electronics and Applications
μ π δ
μ π δ
π=δ
π =δ
π =δ
2007 Second IEEE Conference on Industrial Electronics and Applications 1425