An Improved Discrete PSO for Tugboat Assignment Problem under a Hybrid Scheduling Rule in Container Terminal

Pseudocode 1

While ( < )

 Set the state of each tugboat = 0

 For = 1 to

  If ( = 0 and the state of each assigned tugboat = 0)

   Set the state of each assigned tugboat = 1

   Calculate the conflict ship set

   Calculate the start docking time according to (7)

   Calculate the completion docking time according to (6)

   Set the state of ship   

    = + 1

  End if

 Next

 _flag = _flag + 1

End

Calculate the turnaround time of ships according to (4).