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偏序群S上S-偏序系的内射包 被引量:3
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作者 张霞 徐彦涛 《华南师范大学学报(自然科学版)》 CAS 北大核心 2014年第4期12-15,共4页
偏序幺半群S上的S-偏序系是S-系理论的推广.设S是一个偏序群,应用S-系理论及序理论的方法,讨论了S-偏序系范畴的内射元,得出每个S-偏序系AS都存在唯一的内射包,并具体构造了AS的内射包.在此基础上,进一步得出AS的内射包既是A的极小内射... 偏序幺半群S上的S-偏序系是S-系理论的推广.设S是一个偏序群,应用S-系理论及序理论的方法,讨论了S-偏序系范畴的内射元,得出每个S-偏序系AS都存在唯一的内射包,并具体构造了AS的内射包.在此基础上,进一步得出AS的内射包既是A的极小内射扩张,又是A的极大本质扩张. 展开更多
关键词 偏序群 S-偏序系 内射 内射包
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Global dynamics and optimal control of an influenza model with vaccination, media coverage and treatment
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作者 Lianwen Wang Zhijun Liu +1 位作者 Dashun Xu Xinan Zhang 《International Journal of Biomathematics》 2017年第5期159-183,共25页
In this work, in order to identify the most effective measure and combinations of several measures to control influenza spread, we propose an SVEIAR influenza model with imperfect vaccination, media coverage and antiv... In this work, in order to identify the most effective measure and combinations of several measures to control influenza spread, we propose an SVEIAR influenza model with imperfect vaccination, media coverage and antiviral treatment. The global dynamics of the model is explored. Sensitivity analysis of the basic reproduction number and the endemic equilibrium is conducted to evaluate the effectiveness of influenza control measures. Purthermore, an optimal control problem incorporating the three measures is formulated to design optimal control strategies for influenza. The cost-effectiveness analysis reveals that combining the three measures is the most cost-effective among the strategies considered. Numerical simulations show that media propaganda can play a dominant role in curbing influenza transmission. 展开更多
关键词 SVEIAR influenza model optimal control media coverage VACCINATION antiviral treatment.
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