The result show that the developed BP model is advanced, can satisfy the requirement of engineering in practice and is a new effective method for prediction.
研究结果表明，改进的BP网络性能良好，所建立的模型预测精度高，能满足工程要求，是一种有效可行的预测新方法。
To use this calculation method can simplify the calculation course, at the same time, it could meet the accurate requirement of engineering design.
使用这种计算方法可以简化计算过程，同时能满足工程设计的精度要求。
This paper analyzes the problems which exists in traditional requirement engineering, and brings up a new way of thinking of system requirement engineering based on object oriented method.
分析了传统系统需求存在的问题，提出了基于面向对象方法的系统需求工程的分析和设计的思路。
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