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。
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。
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。
The method of element birth and death was applied to simulate the model of loading welding heat source.
文中简要介绍了焊接过程数值模拟热源的各种加载模式：高斯分布函数、双椭球分布函数、生死单元方法。
Abstract: in this paper, a 2-dimension, nonlinear birth-death prey-predator model is established.
摘要：本文建立了一类二维非线性生灭捕食——被捕食模型。
Abstract: in this paper, a 2-dimension, nonlinear birth-death prey-predator model is established.
摘要：本文建立了一类二维非线性生灭捕食——被捕食模型。
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