Concentrating on the conceptual and structural stage, a hierarchical data structure of the logical assembly model was presented, and the key components of it were analyzed.
侧重于概念和结构设计阶段，提出了概念装配模型的层次化数据结构，并对其中的关键组成元素进行了分析。
Firstly, we propose and study the single-species discrete population model with stage structure and birth pulses.
在第二章，我们研究了密度依赖生育脉冲对单种群阶段结构离散模型的动力学行为的影响。
In this paper, the sis epidemic model with stage structure consisting immature and mature is considered. The threshold is founded which the epidemic will become endemic or die out.
讨论了具有阶段结构的SIS传染病模型，给出了传染病最终消除和成为地方病的阈值。
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