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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Developed a detailed operational process, the required production equipment were selected and provide a reference model, while raw materials were selected and develop the security measures.

对所需生产设备进行了选择，提供了参考型号；同时还进行了生产原料选择、安全防护措施制定、产品的性能指标确定、监测方法选定等工作。

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