Firstly, the construction of ELV system is was analyzed and content of workflow modeling is was introduced.

首先对弱电信息系统的组成进行了分析，并介绍了工作流的建模内容；

I have certain electrical building professional knowledge, be familiar with building automation, building elv.

我有一定的建筑电气专业知识，熟悉楼宇自动化、建筑弱电。

Good knowledge and practical skills in AC/AV/Elec. /ELV/Plumbing/Kitchen equipment/painting/decorating/carpenter.

在强电/空调/弱电/机管/厨房设备/油漆/装饰/木工方面拥有良好的理论及实践技巧。

Finally, taking ELV engine as example, an application research about the optimized remanufacturing reverse logistics network model is carried out.

最后，以汽车发动机为例，对所建再制造逆向物流网络稳健优化模型进行了实际案例应用研究。

Besides, several key problems about how to operate green take-back system of ELV are pointed out, such as take-back network, take-back model, performance evaluation, etc.

并指出了报废汽车绿色回收系统研究需要解决的几个关键技术，如回收网络、回收模式和绩效评价等。