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.

对船舶交通在确保安全的前提下如何提高交通效率进行了探讨，得出了船舶交通流的流体模型，从一个侧面明确了船舶交通效率的量化问。

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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.

本文建立了大流量条件下分布式系统的安全性计算模型，分析了系统的安全性随空中流量的增长而变化的规律。

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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.

最后，结合校园网的实际，根据现有设备条件，运用VLAN技术、NAT技术、路由器访问列表以及流量监控实现了对校园网的基本安全防护。

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