The second one, based on the SEIR model, considers the birth rate and death rate of Internet worms.

第二个模型基于SEIR模型，考虑了网络蠕虫出生率和死亡率的影响。

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We establish a linear birth and death process model of a population in polluted environment.

建立了生物种群在污染环境中的一个线性生灭过程模型。

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By using the matrix analytic method, this model is formulated as a level-dependent Quasi-Birth-and-Death (QBD) process which makes the model much more algorithmically tractable.

通过矩阵分析方法，把模型转化为一个与水平相依的拟生灭过程，从而更有利于算法实现。

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Besides the transparency issue in the SA process (which can lead some to the manipulation conclusion) which the BLS could easily remedy simply by publishing the changed data on a monthly basis, the Establishment Survey suffers from a significant upward bias, known as the Birth-Death model.

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