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     In this paper, a method of constructing a new function, Called trend function, Which can describe the global trend of the objective function, is introduced.
     本文提出了一种构造反映全局信息的趋势函数,指导搜索全局最优的新方法。 通过离散傅里叶变换和反变换能构造出反映系统整体信息的趋势函数,它可以为搜索全局最优提供指导信息。
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Global information is helpul in global optimization. In this paper, a method of constructing a new function, Called trend function, Which can describe the global trend of the objective function, is introduced. The trhed function is constructed through an extended discrete fourier transformation and inverse discrete fourier transformation. With the help of the trend function, this method can oversome the attraction of local extreumus. Illustrations show the procedure of the solution approaching the global optimal...

Global information is helpul in global optimization. In this paper, a method of constructing a new function, Called trend function, Which can describe the global trend of the objective function, is introduced. The trhed function is constructed through an extended discrete fourier transformation and inverse discrete fourier transformation. With the help of the trend function, this method can oversome the attraction of local extreumus. Illustrations show the procedure of the solution approaching the global optimal point. This method can improve the efficiency of global optimization, reduce the computation and shorten the time of global optimization.

全局信息能有效地指导搜索全局最优解。本文提出了一种构造反映全局信息的趋势函数,指导搜索全局最优的新方法。通过离散傅里叶变换和反变换能构造出反映系统整体信息的趋势函数,它可以为搜索全局最优提供指导信息。对于没有解析表达式的目标函数,也可以通过离散傅里叶变换和反变换来重构目标函数。该方法可以有效地避免陷入局部最小点。实例分析显示了解点逐渐向全局极小逼近的过程。叠代过程中只需计算少量离散点的函数值,计算效率较高,对目标函数计算困难时的寻优问题很有帮助。

township health institutions were surveyed by using questionnaire in Shandong province. The results of economic efficiency analysis showed that the average costs of both township hospitals and family planning stations with MIPS are both lower than those without MIPS and the difference are 8.24 yuan and 11.59 yuan separately. Meantime the average cost of township hospitals with MIPS is 8.10 yuan lower than that of township family planning station with MIPS. Based on the results, we can include that township-hospital-based...

township health institutions were surveyed by using questionnaire in Shandong province. The results of economic efficiency analysis showed that the average costs of both township hospitals and family planning stations with MIPS are both lower than those without MIPS and the difference are 8.24 yuan and 11.59 yuan separately. Meantime the average cost of township hospitals with MIPS is 8.10 yuan lower than that of township family planning station with MIPS. Based on the results, we can include that township-hospital-based MIPS is most economically efficient, and township hospital is a practical provider. The authors suggest that organizational reform and/or mergence trial in selected places is necessary and meaningful.

本文对山东省 10个乡卫生院和 8个乡计划生育服务站母婴保健保偿制项目的运作情况进行了调查分析 ,并比较了两类机构的经济效益。结果表明 :实行母婴保健保偿制的乡卫生院和乡计生站的平均成本均比未实行保偿制的同类机构低 ,前者低 8.2 4元 ,后者低 11.5 9元 ,同时实行保偿制的乡卫生院的平均成本比实行保偿制的乡计生站的平均成本低 8.10元。根据研究结果认为以乡卫生院为基础的母婴保健保偿制是最优的提供者 ,建议进行母婴保健保偿制机构改革和 /或两类服务机构合并试点

Traditional model of distribution networks mostly research the response of input excitation, by describing elements and connections of elements for distribution networks. When the states of vertexes in distribution networks have changed, the connections of elements transformation. Owning to the mutual couplings and branches of distribution networks, it is hard to achieve the global optimization for load balancing, reconfiguration and restoration after fault by nomograph. A new model based on hierarchical model...

Traditional model of distribution networks mostly research the response of input excitation, by describing elements and connections of elements for distribution networks. When the states of vertexes in distribution networks have changed, the connections of elements transformation. Owning to the mutual couplings and branches of distribution networks, it is hard to achieve the global optimization for load balancing, reconfiguration and restoration after fault by nomograph. A new model based on hierarchical model is presented. This model can be employed to identify the zone and branches efficiently and offer a cogent topological analysis method for the global optimization. The test result shows the effectiveness of the proposed method.

传统的电网模型主要描述网络元件和网络元件联结 ,其网络模型最终要解决的问题是在某一输入下的输出响应情况。而配电网的网络拓扑描述不仅要表示出各顶点之间的联结关系 ,而且要描述出当开关状态改变时 ,其运行网络结构的变化及对应参数的变化。同时配电网中存在T接点、分支 ,使配电网的负荷分配、网络重构、恢复供电等功能采用图算法难以实现全局最优。基于分层的拓扑模型不仅可以有效地辨识处理区域与分支 ,而且采用分层拓扑模型可以方便地对配电网各顶点进行状态估计 ,从而为配电网图算法的解实现全局最优提供了强有力的拓扑分析方法

 
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