Sufficient conditions are obtained for the global existence of a positive periodic solution of periodic neutral delay predator-prey system by using the method of coincidence degree theory.

利用重合度理论建立了一类周期中立型时滞捕食者-食饵系统正周期解的全局存在性的充分条件。

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The reasonability and validity of the method was testified by the coincidence of the simulation and the theory analysis under the motion mode of trapezoidal velocity and S-velocity profile.

在T形和S -曲线速度轮廓运动模式下，模型的仿真结果与理论分析一致，验证了该方法的合理性和有效性。

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Based on it, a graphic method simplifying the OR-Coincidence (OC) expansions of a logic function under fixed polarity by using K-map is presented.

在此基础上提出了基于K图的逻辑函数oc展开式在固定极性下化简的新方法。

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