Keeping in mind that retrofitting funds for old power plants are limited, the paper discusses the design principles of coordinated control systems and the way of doing the design.

在老电厂改造经费较少的情况下，分析了具有电网中调控制方式的协调控制系统的设计原则和主要控制系统的设计方法。

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Collapse-proof systems is a new method for seismic design and retrofitting, and the main purpose is to prevent the girders form falling off their supports.

防落梁系统是一种新型的减、抗震设计和加固方法，由梁搁置长度、限位装置、连梁装置等三部分组成的，其主要功能是阻止梁从支承上脱落。

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Structural factors include: materials used in construction, number of floors, design, and retrofitting present.

结构性因素包括：建筑过程中采用的材料，楼房层数，设计方案以及翻新的现状等。

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But retrofitting an existing design with more steel can be "very expensive and very heavy, " potentially undermining fuel efficiency, he says.

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