1 引言随着社会信息量的增大,在各种应用领域里的数据库中存储了大量的数据,这使得人们对这些数据进行分析并转化为有用知识的需求变得越来越迫切。于是知识发现与数据挖掘(Knowledge Discovery and Data Mining,KDD)自然成为近年来人...1 引言随着社会信息量的增大,在各种应用领域里的数据库中存储了大量的数据,这使得人们对这些数据进行分析并转化为有用知识的需求变得越来越迫切。于是知识发现与数据挖掘(Knowledge Discovery and Data Mining,KDD)自然成为近年来人们从大型数据库中获取信息的一个重要的研究领域。一般地,数据挖掘就是指从数据库或数据仓库中发现隐藏的、预先未知的、有趣的信息的过程,该过程可以看作是知识发现过程中的一个核心的步骤。目前,能够用于解决机器学习问题的方法主要有三种类型,即:模糊规则的学习方法、神经网络学习方法和遗传进化的学习方法。纵观数据挖掘中的规则提取方法,决策树规则提取方法不能实现多变量搜索,因为它在建树时每一个节点只含有一个特征。展开更多
Considering multi-factor influence, a forecasting model was built. The structure of BP neural network was designed, and immune algorithm was applied to optimize its network structure and weight. After training the dat...Considering multi-factor influence, a forecasting model was built. The structure of BP neural network was designed, and immune algorithm was applied to optimize its network structure and weight. After training the data of power demand from the year 1980 to 2005 in China, a nonlinear network model was obtained on the relationship between power demand and the factors which had impacts on it, and thus the above proposed method was verified. Meanwhile, the results were compared to those of neural network optimized by genetic algorithm. The results show that this method is superior to neural network optimized by genetic algorithm and is one of the effective ways of time series forecast.展开更多
文摘1 引言随着社会信息量的增大,在各种应用领域里的数据库中存储了大量的数据,这使得人们对这些数据进行分析并转化为有用知识的需求变得越来越迫切。于是知识发现与数据挖掘(Knowledge Discovery and Data Mining,KDD)自然成为近年来人们从大型数据库中获取信息的一个重要的研究领域。一般地,数据挖掘就是指从数据库或数据仓库中发现隐藏的、预先未知的、有趣的信息的过程,该过程可以看作是知识发现过程中的一个核心的步骤。目前,能够用于解决机器学习问题的方法主要有三种类型,即:模糊规则的学习方法、神经网络学习方法和遗传进化的学习方法。纵观数据挖掘中的规则提取方法,决策树规则提取方法不能实现多变量搜索,因为它在建树时每一个节点只含有一个特征。
基金Project(70373017) supported by the National Natural Science Foundation of China
文摘Considering multi-factor influence, a forecasting model was built. The structure of BP neural network was designed, and immune algorithm was applied to optimize its network structure and weight. After training the data of power demand from the year 1980 to 2005 in China, a nonlinear network model was obtained on the relationship between power demand and the factors which had impacts on it, and thus the above proposed method was verified. Meanwhile, the results were compared to those of neural network optimized by genetic algorithm. The results show that this method is superior to neural network optimized by genetic algorithm and is one of the effective ways of time series forecast.
