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基于分组总体异步更新过程的策略随机演化
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作者 李夏飞 刘心声 《高校应用数学学报(A辑)》 CSCD 北大核心 2012年第1期1-11,共11页
在分组总体模型中,利用转移概率公式分别推导了弱选择下基于Moran过程、成对比较过程和局部更新过程的一般策略进化条件;然后基于成对比较过程,利用组内方差和组间离差的近似公式,得到了合作策略进化的条件,并进一步将突变、惩罚和报复... 在分组总体模型中,利用转移概率公式分别推导了弱选择下基于Moran过程、成对比较过程和局部更新过程的一般策略进化条件;然后基于成对比较过程,利用组内方差和组间离差的近似公式,得到了合作策略进化的条件,并进一步将突变、惩罚和报复机制引入分组总体模型中,讨论合作策略进化的条件. 展开更多
关键词 Moran过程 成对比较过程 局部更新过程 分组总体
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Research on Risk Control of Medical Insurance Fund
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作者 YAN Lifang 《International English Education Research》 2017年第1期42-44,共3页
Social health insurance is an important part of the social security system. It is the "stabilizer" of social and economic development and the "buffer" of reform. It is of great significance and function to the con... Social health insurance is an important part of the social security system. It is the "stabilizer" of social and economic development and the "buffer" of reform. It is of great significance and function to the construction of economic development, social progrcss and harmonious society. However, due to many factors, the operation of the social health insurance fund is facing greater risk. Although the balance is rich, but the general talk about the "balance", inevitably fall into the "too optimistic, ignore the risk" of the errors, the current basic medical insurance system, compared with working employees, retirement elderly people do not pay, personal accounts into more, The overall proportion of individual funds to pay lower policy concessions. Although there is a large amount of surplus in the annual health insurance fund, a large part of the balance is due to the relatively young age structure of the insured population and the low consumption of health insurance funds. With the increasing level of the aging of the insured population, the ratio of on-the-job and the backward is gradually reduced, the effect of these preferential policies will continue to enlarge, making the total fund expenditure increased significantly. Therefore, it is an important task to reform the basic medical insurance system in China to strengthen the research on risk control in the medical insurance fund of urban workers, to prevent and control the risks faced by the fund and to ensure the safety of the fund. 展开更多
关键词 Medical insurance fund risk control
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