<正>从地铁综合自动化系统的功能、层次结构、软件设置、系统间接口等方面展开研究。在充分分析地铁综合自动化系统优势的基础上，研究了综合自动化开发平台的控制层次、系统间的接口设计，重点探讨了系统可靠性的设计与分析，并对系统设计中的安全性问题进行了探讨。所设计的系统可达到适应城市轨道交通弱电系统功能的需求。

Plant diversity is the foundation of ecological function of greenland system in expressways and the prerequisites of greenland landscape diversity, which also indicates the level of greening engineering. Applying the theory of plant diversity to the landscape projects on the Ninghuai expressway, this paper evaluates the diversity state of the arbor layer and shrub layer with the approach of α-diversity. It is found that the categories of plants are abundant; the arbor layer of the five interflowing areas evaluated is inferior to the shrub layer in plant species and there exists variations in species index; the variation index Simpson and Shannon-wiener in shrub layer is greater than in arbor layer. The diversity index in shrub layer is relatively high, which indicates high diversity and consistency. The plant diversity in Ninghuai expressway is superior to that of natural communities in the same latitude. The afforestation is close to deciduous broadleaved forests in nature with fewer species than in evergreen broadleaved forests.