DDR architecture pattern composes of display layer, definition layer and realization layer. DDR体系结构模式由显示层、定义层(DL)与实现层组成。
Finally the thesis establishes a practical simulation environment of manufacturability, implements dynamic simulation of SMT. He implements the system in three layers : first, in the semantic definition layer, it establishes the data structure construct and semantic model; 最后建立了一个比较实用的贴装仿真系统,实现了贴装工艺流程的可视化动态仿真。在语义定义层(DL)完成企业数据结构的搭建和语义建模工作;
Definition layer is the core of DDR architecture pattern, it envelops changeable system inner elements, which normally express with meta-object, and the set of all meta-objects composes the data dictionary of definition layer. 定义层(DL)是DDR体系结构模式的核心,它封装了可更改的系统内部成分&通常以元对象的方式表示,所有元对象的集合形成定义层(DL)的数据字典。
The system is composed of the multimedia data access layer, the multimedia data definition layer, the multimedia data re-presentation layer and the application layer. 数据模型由媒体存取层、多媒体对象层和多媒体表现层和多媒体应用层构成。
In view of the definition layer, the configuration layer and the process element layer of the SCOR of Sichuan salt industry supply chain in the emergency situation, the emergency response proposals and measures were proposed respectively. 针对应急情况下的四川盐业供应链SCOR模型的定义层(DL)、配置层、流程元素层分别提出应急建议及措施。