业务工作流程的动态本质可以在一个两层的模型中进行分析，如图1中的分层结构所示。
The dynamic nature of business workflows can be analyzed in a two-layer model, as shown in the layered hierarchy in Figure 1.
本文首先分析了信息服务系统中各种计费模式，然后对计费的工作流程、计费系统的结构以及计费与外界的接口分别作了详细探讨。
This paper first gives all charging modes for information service system, then describes charging workflow, charging system architecture and charging system interface with other systems.
分析了SDRAM芯片(MT 48lc16 M 16a2tg - 75it)的结构和工作原理，确定了内存sdram控制器的内部结构和工作流程，完成了内存sdram控制器的控制通路和数据通路设计。
Structure and work principle of SDRAM chip (MT48LC16M16A2TG-75IT) is analyzed. Internal architecture and workflow of SDRAM controller is confirmed. Furthermore, its control and data path is designed.
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