This study attempts to explore the efficiency of information transfer in China stock market by analysis of the trading and non trading time effect and the weekday effect.

通过对交易时间与非交易时间效应及周日效应的分析，对中国股票市场信息传递效率的问题展开实证研究。

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For improving the efficiency of power system stability analysis, it is necessary to study two time scale dynamic models of power systems and relevant model reduction.

为提高稳定计算的效率，对复杂的电力系统模型进行化简，以实现系统化降阶非常必要。

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