Our empirical results from historical data of 19 countries in 25 years (1975-2000) show that the return differential of equity market has good prediction power for currency crises.

对19个国家25年（1975—2000）月度数据的拟合效果表明在经汇率调整后的对美国股市收益率差有着较好的拟合结果。

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Aiming at the defects of BP artificial neural network, combined with Differential Evolution Algorithm, the paper proposes a tourist quantity prediction model based on DE-BP neural network.

针对BP人工神经网络所存在的缺陷，结合差异演化算法，提出了基于DE - BP神经网络的旅游客源预测模型。

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