Chapter 4 gives the security model of the TDIS by the studies on security strategies of information system.

第四章通过信息系统开发的安全策略的研究并结合第三章得到了列车运行图信息系统安全模型。

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Tourism destination identity has been paid more and more attention, however, it is a new start study on TDIS in China.

旅游形象设计在新时期日益受到各方面的重视，有关旅游目的地形象设计的研究，对国内来说还是一个崭新的工作。

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Tourism destination identity system has been paid more and more attention. However, it is a new start study on TDIS in China.

区域旅游形象策划在新时期日益受到各方重视，有关旅游地形象策划的研究，在国内还是一项崭新的工作。

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