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Classification- and Regression-Assisted Differential Evolution for Computationally Expensive Problems 下载免费PDF全文
Differential Evolution (DE) has been well accepted as an effective evolutionary optimization technique. However, it usually involves a large number of fitness evaluations to obtain a satisfactory solution. This disadvantage severely restricts its application to computationally expensive problems, for which a single fitness evaluation can be highly timeconsuming. In the past decade, a lot of investigations have been conducted to incorporate a surrogate model into an evolutionary algorithm (EA) to alleviate its computational burden in this scenario. However, only limited work was devoted to DE. More importantly, although various types of surrogate models, such as regression, ranking, and classification models, have been investigated separately, none of them consistently outperforms others. In this paper, we propose to construct a surrogate model by combining both regression and classification techniques. It is shown that due to the specific selection strategy of DE, a synergy can be established between these two types of models, and leads to a surrogate model that is more appropriate for DE. A novel surrogate model-assisted DE, named Classification-and Regression-Assisted DE (CRADE) is proposed on this basis. Experimental studies are carried out on a set of 16 benchmark functions, and CRADE has shown significant superiority over DE-assisted with only regression or classification models. Further comparison to three state-of-the-art DE variants, i.e., DE with global and local neighborhoods (DEGL), JADE, and composite DE (CoDE), also demonstrates the superiority of CRADE. 相似文献
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1引言有载分接开关是变压器的重要组成部分 ,其可靠性直接影响主变的可靠性。随着经济的迅速发展 ,电力负荷变化悬殊 ,电网电压波动范围加大 ,有载分接开关的操作日趋频繁 ,其事故率也在增加。近两年我局有两台主变发生分接开关故障 ,笔者结合一些工作体会 ,浅析两起分接开关故障 ,供大家参考。2故障实例分析、处理与建议(1)有载分接开关进水受潮1997年 ,我局35kV荆溪变年检中 ,发现1号主变(型号为SLZ7-6500/35,其分接开关的型号为SYJZ6-35/200-7)高压对地的绝缘仅为24MΩ ,介损、电容量、吸收比… 相似文献
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混凝土工程施工过程中,经常发生蜂窝、麻面等质量通病。如何最大限度的消除质量通病,保证工程结构安全,是工程技术人员最为关注的问题。本文结合工作实际,对混凝土工程的质量通病的产生和防治进行探讨。 相似文献
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聚苯颗粒保温砂浆因为保温节能效果好,寿命长,被广泛应用于建筑外墙节能保温。分析了当前聚苯颗粒保温砂浆在外墙保温应用方面存在的问题,根据工作实际提出建议与对策。 相似文献
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目的 为解决目前自动扶梯存在传统人工消毒耗时耗力、每时每刻杀菌消毒难以及消毒不全面等问题,进行自动扶梯消毒产品创新设计。方法 首先,通过用户评价法,得出可靠性、功能性、可操作性、高效性、布局合理性、友好度、信任度、环保性及美观性是自动扶梯消毒产品的主要需求要素。其次,提出PUGH矩阵选择法,为产品设计方案的选择提供有效的评判工具,通过选择与权衡,从3种设计方案中得到最优设计方案。最后,所设计和完善产品方案的核心模块,并将产品创意进行三维可视化,利用光固化3D打印技术打样产品原型。结果 采用ATP荧光检测仪对该产品的消毒效果进行充分的实验及研究,通过用户评价法验证该研究的实用性和可行性。结论 运用该产品为自动扶梯消毒效果的改进提供了合理的装置,可以更加准确地满足自动扶梯的消毒需求。 相似文献
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随着我国加入WTO和社会经济的不断发展,水资源的重要性显得日益突出,因此,如何保护水质,提高水资源利用率,是21世纪必须着重研究和探讨的课题。该文针对浦城县水体污染现状,提出水质保护设想,为支持地方经济社会的可持续发展创造有利条件。 相似文献