Overland vehicle routing problem(VRP) model is extended,in which minimum total navigation cost of all scheduled ships is taken as objective function,some practical factors such as time restriction are considered,a feeder line container ships scheduling model is constructed for hub-spoke maritime transportation system including hub port, feeder ports,multi-routes and multi-ship types.
In this paper, mechanism of collecting coaxial information in laser welding is introduced, the setups of light path for collecting coaxial emission light is analyzed.