利用不定方程理论及中国剩余定理，我们设计了一类陷门背包公开钥密码系统，它们具有更好的安全性。

Using the theorem of linear Diophantine equations and the Chinese remainder theorem, we have constructed a class of trap-door knapsack public-key cryptosystems, which have a better security.

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对于毕竟破产概率，结合维他里型积分方程系统，得到了破产的严重性以及破产前和后的剩余额的联合分布。

Coupled Volterra type integral equation systems for ultimate ruin probability, severity of ruin and joint distribution of surplus before and after ruin are also obtained.

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讨论用QR分解拟合回归方程时，参数估计和剩余的迭代加细算法。

Algorithms for iteratively refining the parameter estimates and residuals from the fitting of a regression model using QR decomposition are described.

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