Through the hierarchical research of workflow process model, it is put forward three levels of workflow process models: meta model level, model level and control model level.
对工作流过程模型进行分层研究，提出了三层架构的工作流过程模型：元模型层、模型层和控制模型层。
This paper describes three grid access control models based on different current model.
文中将讨论三种基于不同方式的网格访问控制模型。
Using computer models, they tested the three main public health policies used to control epidemics, and found different but high levels of effectiveness in all.
应用计算机模型，他们对流行病控制所用的三种主要公共卫生策略进行了测试，发现三者效果有所不同、但都十分有效。
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