期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
遗传算法在单层球壳质量、刚度模糊优化中的应用 被引量:1
1
作者 叶继红 江季松 《振动与冲击》 EI CSCD 北大核心 2010年第6期35-41,共7页
在单层球壳的优化设计过程中,必然会遇到大量的不确定性信息和因素,对这些不确定性因素应该使用模糊理论加以分析和处理。同时往往要考虑多个目标如质量最小和整体刚度最大等,而各个目标之间存在矛盾,要使各个目标都达到最优很困难。采... 在单层球壳的优化设计过程中,必然会遇到大量的不确定性信息和因素,对这些不确定性因素应该使用模糊理论加以分析和处理。同时往往要考虑多个目标如质量最小和整体刚度最大等,而各个目标之间存在矛盾,要使各个目标都达到最优很困难。采用模糊数学的原理建立单层球壳多目标模糊优化模型,通过模糊判决法,将多目标的模糊优化问题转化为单目标的非模糊优化问题,最后利用小生境遗传算法(ANGA算法)对非模糊化的优化模型进行求解。对70 m跨单层球壳进行质量、刚度模糊优化,结果令人满意,验证了该方法的合理性和可行性,说明基于ANGA算法的模糊优化方法可以有效解决优化变量繁多的大中型网格结构多目标模糊优化问题。 展开更多
关键词 单层球壳 多目标模糊优化 模糊判决法 ANGA算
下载PDF
Application Comparison of Association Rules and C4.5 Rules in Land Evaluation 被引量:3
2
作者 李亭 杨敬锋 陈志民 《Agricultural Science & Technology》 CAS 2010年第4期144-147,共4页
Association rules and C4.5 rules can overcome the shortage of the traditional land evaluation methods and improve the intelligibility and efficiency of the land evaluation knowledge.In order to compare these two kinds... Association rules and C4.5 rules can overcome the shortage of the traditional land evaluation methods and improve the intelligibility and efficiency of the land evaluation knowledge.In order to compare these two kinds of classification rules in the application,two fuzzy classifiers were established by combining with fuzzy decision algorithm especially based on Second General Soil Survey of Guangdong Province.The results of experiments demonstrated that the fuzzy classifier based on association rules obtain a higher accuracy rate,but with more complex calculation process and more computational overhead;the fuzzy classifier based on C4.5 rules obtain a slightly lower accuracy,but with fast computation and simpler calculation. 展开更多
关键词 Land evaluation Association rules C4.5 Algorithm Fuzzy decision
下载PDF
Land Evaluation Method Based on Decision Tree Produced by C4.5 and Fuzzy Decision 被引量:2
3
作者 杨敬锋 李亭 陈志民 《Agricultural Science & Technology》 CAS 2010年第3期1-3,27,共4页
[Objective]The aim was to overcome the shortage of being difficult to build land evaluation model when the impact factors had continuous value in the traditional land evaluation process,as well as to improve the intel... [Objective]The aim was to overcome the shortage of being difficult to build land evaluation model when the impact factors had continuous value in the traditional land evaluation process,as well as to improve the intelligibility of the land evaluation knowledge.[Method] The land evaluation method combining classification rule extracted by C4.5 algorithm with fuzzy decision was proposed in this study.[Result] The result of Second General Soil Survey of Guangdong Province had demonstrated that the method was convenient to extract classification rules,and by using only 100 rules,quantity correct rate 86.67% and area correct rate 84.80% of land evaluation could be obtained.[Conclusions] The use of C4.5 algorithm to obtain the rules,combined with fuzzy decision algorithm to build classifiers had got satisfactory results,which provided a practical algorithm for the land evaluation. 展开更多
关键词 Land Evaluation C4.5 Algorithm Fuzzy decision
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部