The Scala model also has security issues because reference to the caller is passed with every message.

Scala 模型还存在一些安全性问题，因为每条消息都传递对调用方的引用。

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Finally, proposed some questions to be solved urgently in the SOA's research, such as a recognized SOA reference model, an uniform SOA standard and the SOA security mechanism.

最后，提出在SOA研究中还急需解决的问题，如公认的SOA参考模型、统一的SOA架构体系标准及SOA的安全机制。

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The fuzzy evaluation model of environment security was also built, which was expected to provide a reference to scale security evaluation of high-rise buildings.

同时，提出了高层建筑的环境安全单方面的灰色关联评价及整体的模糊综合评价模型及运行步骤。

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