(7)  α = arg min  α   - 2 α  T   V  W  T   V  K   + α  T   V  W  T   V  K   α   + λ ( - 2 α  T   μ + α  T   Θ α  )    s . t .   α  m   ≥ 0 , 1 ≤ m ≤ M