Lastly, along with campus fact and equipment, using technology of VLAN, NAT, router access-list and network traffic flow monitoring system, we carry out basic security defense of campus network.

This paper explores how to promote vessel traffic efficiency on condition that the security of vessel traffic is insured and puts forward fluid model for vessel traffic flow.

In this paper, we established a security calculation model for the decentralized system under high traffic flow and analyzed the change of system security with the change of traffic flow.