用龙格一库塔法进行了混合对流换热的数值求解，结合食品冷冻分析了数值计算结果，探讨了食品冷冻中冷风的合理流向。

This paper describes using the Runge-Kutta method to carry on numerical calculation about mixed convection heat transfer, and analyses the result combining with the process of food freezing.

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推广了单噪声驱动系统的二阶随机龙格库塔数值模拟算法，使之适用于关联白噪声和色噪声共同驱动的系统这一更为复杂的情况。

The second order stochastic Runge Kutta algorithm for systems driven by a single additive noise is generalized, which makes it more suitable for complex situation.

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利用快速傅里叶变换法加龙格-库塔法对期权的最佳执行价格进行了分析和计算，最后通过数值算例说明了这一方法的有效性和准确性。

This paper analyses and computes the optimal exercise price of the American put option, by using the "FFT-RK" method. At last, numerical examples show that this method is efficient and accurate.

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