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中文摘要：
设计航天控制系统是一个复杂的过程，涉及需求设计、编码、测试等一系列的流程，若能在需求设计阶段发现错误，那么能减少不少的工作量。针对这一问题，提出了一种分析控制软件需求的方法和一个名为SP—ARDL的建模语言，并制作了一套SPARDL工具。SPARDL可以描述周期性的控制系统，首先将需求文档转换为SPARDL模型，且提供了图形化的表示方法；然后运用原型生成技术去仿真系统的行为，进一步分析需求的准确性。最后以一个案例表明了用SPARDL分析一个简单的航天控制系统需求的有效性。
英文摘要：
It is a complex process to design a periodic control system which involves design, coding, test and so on. If errors can be found in the period of requirement design, it will reduce a lot of work. In order to solve this problem, this paper proposed an analysis method for control system specification and also provided a modeling language called SPARDL and the SPARDL tool. First SPARDL tool converted a requirement to SPARDL model and provided a graphical interface to show the entire control system. Then it used a prototype generation technique to simulate the system behaviors. It could analyze the accu- racy of the requirement. Finally, a case study shows the effectiveness of using SPARDL to analyze the requirement of a simple aerospace control system.
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Proving total correctness and generating preconditions for loop programs via symbolic-numeric comput
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