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Karla Taboada Eloy Gonzales Kaoru Shimada Shingo Mabu Kotaro Hirasawa Jinglu Hu 《IEEJ Transactions on Electrical and Electronic Engineering》2008,3(2):199-211
Most of the existing association rule mining algorithms are able to extract knowledge from databases with attributes of binary values. However, in real‐world applications, databases are usually composed of continuous values such as height, length or weight. If the attributes are continuous, the algorithms are commonly integrated with a discretization method that transforms them into discrete attributes. Discretization is a process of transforming a continuous attribute value into a finite number of intervals and assigning each interval into a discrete numerical value. However, the user most often must specify the number of intervals, or provide some heuristic rules to be used while discretization, and then it is difficult to get the highest attribute interdependency and at the same time get the lowest number of intervals. In this paper we present an association rule mining algorithm that is suited for continuous valued attributes commonly found in scientific and statistical databases. We propose a method using a new graph‐based evolutionary algorithm named ‘genetic network programming (GNP)’ that can deal with continuous values directly, that is, without using any discretization method as a preprocessing step. GNP represents its individuals using graph structures and evolves them in order to find a solution; this feature contributes to creating very compact programs and implicitly memorizing past action sequences. In the proposed method using GNP, the significance of the extracted association rules is measured by the use of χ2 test, and only important association rules are stored in a pool all together through generations. Results of experiments conducted on a real‐life database suggest that the proposed method provides an effective technique for handling continuous attributes. Copyright © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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Yuchen Yang Shingo Mabu Kaoru Shimada Kotaro Hirasawa 《IEEJ Transactions on Electrical and Electronic Engineering》2011,6(4):353-360
Intertransaction class association rule (interCAR) has the ability to find the relationships among attributes from different transactions, which has shown its effectiveness for stock market prediction. A crisp interCAR mining method based on Genetic Network Programming (GNP) has been studied in our previous work. But, the crisp method loses much useful information in the discretization and it has many unstable factors influencing the prediction results, so more information is desired in order to make the prediction safer and more efficient. In this paper, a fuzzy interCAR mining method is proposed to keep as much information as possible in the data transformation. Besides, the proposed method has ability that the trading actions bring large profits. The proposed method is applied to Tokyo Stock Exchange, where we compared it with the crisp method as well as some other methods. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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基于数据挖掘的电站运行优化应用研究 总被引:1,自引:2,他引:1
火电机组运行优化目标值的合理确定是关系到机组经济性诊断正确性与准确性的重要因素,该文充分利用火电厂运行数据的关联特性,提出了基于模糊关联规则挖掘的电站运行优化目标值确定方法,利用改进的模糊关联规则挖掘算法从电站运行历史数据中挖掘定量关联规则,以指导优化运行,解决了传统优化目标值确定中对机组实际状态考虑不足而失去指导意义的问题。以某300MW机组历史运行数据为基础,对各典型负荷工况下的历史数据进行挖掘,得到各运行工况下的最优值以指导实际运行。运行试验结果表明,基于模糊关联规则挖掘的运行优化目标值确定方法可以提高机组运行效率,降低污染物排放,优化目标值来源于机组实际运行数据,能够反映机组在特定负荷和相关条件下的最优运行状态,可以指导机组的优化运行。 相似文献
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在传统的Apriori关联规则挖掘算法分析基础上,针对目前多最小支持度和增量式关联规则挖掘的局限性,提出基于多最小支持度的增量式关联规则挖掘算法。该算法适用于事务出现频率一致及不一致的情况,利用多最小支持度能挖掘出更有意义的结果;同时,该算法还能实现事务数据不断增加时的数据挖掘,提高了挖掘的效率。应用电力客户信用数据库进行实验的结果表明,改进算法能有效挖掘出稀有项,分析出潜在的信用风险客户,对电力客户信用评价具有辅助决策作用。 相似文献
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提出了基于主成分分析的相似关联规则的数据挖掘方法,并利用最小二乘支持向量回归方法对传感器进行故障检测。通过主成分分析寻找具有相似关联规则的参数,利用参数间的相似关联关系,建立最小二乘支持向量回归模型,通过该模型生成残差对传感器进行状态监测和故障定位,并对故障数据进行重构,代替故障数据。通过某300 MW机组数据实例分析,表明该方法能准确快速地寻找具有较高相似关联规则的参数,并能给出可信的重构数据,具有一定的实用性。 相似文献
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Rong Zhang Kaoru Shimada Shingo Mabu Kotaro Hirasawa 《IEEJ Transactions on Electrical and Electronic Engineering》2014,9(4):398-406
Attribute selection is a technique to prune less relevant information and discover high‐quality knowledge. It is especially useful for the classification of a large database, because the preprocessing of data increases the possibility that predictor attributes given to the mining algorithm become more relevant to the class attribute. In this paper, a method to acquire the optimal attribute subset for the genetic network programming (GNP) based class association rule mining has been proposed, and this attribute selection process using genetic algorithm (GA) leads to a higher accuracy for classification. Class association rule mining through GNP is conducted with a small subset of data rather than the original large number of attributes; thus simple but important rules are obtained for classification while the local optimal problem is avoided. Simulation results with educational data show that the classification accuracy is largely improved from 52.73 to 74.54%, when classification is made using the optimal attribute subset. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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为降低电力信息网络入侵检测的检测误差和检测耗时,提出一种基于改进最小闭包球向量机(minimum enclosing ball vector machine,MEBVM)的入侵检测方法。该方法将入侵检测抽象成多分类问题,通过改进MEBVM对历史数据样本的训练学习来得到入侵检测模型。改进MEBVM利用最小闭包球降低检测耗时,并在训练过程中利用粒子群优化算法动态搜索MEBVM的最优训练参数以降低入侵检测模型误差。最后基于电力信息网络现场数据的实验证明,该方法与传统方法相比具有更高的检测精度和更少的检测耗时。 相似文献
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挖掘关联规则是数据挖掘中的一个重要课题。针对挖掘关联规则典型算法中的某种不足,介绍了一个不需要产生候选集的挖掘关联规则的算法FP-tree。经过深入研究,对它进行了分析和评价。 相似文献
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根据大型火电机组的协调控制系统被控对象的特性,提出了一种基于遗传规划的控制器设计方法。该方法不同于传统的多变量控制器设计方法,将多变量控制问题转化为多个单变量控制问题来考虑,而是通过遗传规划算法直接搜索适合于协调控制被控对象的最优控制律,从而使得闭环对象具有良好的控制品质,满足现场高质量的要求。并且采用遗传规划算法还可以得到适用于同样对象的PID控制器,也具有很好的控制品质,通过对两种控制器的控制效果进行比较,进一步说明遗传规划算法在控制器设计上的可行性。 相似文献
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开发了基于决策支持系统的配网优化规划软件包, 具有系统规划、方案分析、方案决策、方案绘图和数据库管理系统等功能。静态规划建立了混合整数规划模型, 利用基于线性规划换基运算的支路交换法有效地求解该模型。动态规划, 采用临界可行匹配算法和伪动态匹配法在全临界匹配空间找到最优化动态决策。采用支路自动分解、最优乘子的快速分解法潮流计算, 收敛性好、速度快、占内存少。算例说明该软件包适用于大规模配电网规划, 使用方便灵活 相似文献
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本文将关联规则挖掘与模糊推理方法应用到XLPE电缆的局部放电模式识别中,采用竞争聚类方法划分区间以离散化特征,通过关联规则法挖掘特征间的相互关系来提取分类规则,进而将这些规则模糊化用于模式识别。该方法能有效挖掘出各特征参数与缺陷类型的潜在规则,对局部放电的模式识别和电缆绝缘故障诊断具有极大的参考价值。本文针对几种典型的XLPE电缆局放数据,提取相关的统计特征参数,采用该模式识别系统进行分类,并与多层感知神经网络、决策树C4.5等方法识别的结果进行对比分析。实验结果表明该算法提出的规则具有识别率高、识别速度快、解释性好和区间可动态划分等特点,提供了一种局部放电模式识别新的可行方案。 相似文献