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提出一种基于模糊理论的关联规则挖掘方法来处理数量属性,模糊理论能够实现数据的平滑过渡,使得挖掘出的关联规则具有高度的可理解性,给出了模糊关联规则的形式定义和挖掘算法. 相似文献
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赵连朋 《计算机工程与应用》2006,42(7):197-199,229
侦察决策是侦察者通过对案件进行分析后作出的侦察选择或者决定。在案件侦察过程中,采用数据挖掘技术开采海量的侦察数据,从中发现有价值的信息,是刻画案情和决策侦察行为的重要环节。因此,论文提出了一个基于数据挖掘技术的侦察决策辅助支持系统,探讨了该系统的核心功能。在数据挖掘方面,主要采用数据聚类和关联规则技术,并且通过使用案件侦破后修正规则库的手段,使该系统对规则具有一定的自我学习的智能功能。解决了海量的侦察数据与有价值的数据之间的矛盾,挖掘出可能的有价值的犯罪过程和犯罪信息,使侦察决策的形成更具有科学性和现实性。 相似文献
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关联规则是数据挖掘研究中的一个重要的主题。一些算法都是假设数据中根本的关联基于时间是稳定的。然而,在现实世界领域,数据具有自己的特征,因此关联随着时间发生巨大的改变。现有的数据挖掘算法没有考虑关联的改变,这导致了严重的性能下降,特别是挖掘出的关联规则被用来分类和预测。尽管关联改变的挖掘是一个重要的问题,因为需要基于过去的历史数据来预测未来,现有的数据挖掘算法不符合这样的工作。文中引入模糊数据挖掘算法来发现基于时间的关联规则的改变。基于挖掘出的模糊规则,能预测关联规则在未来如何改变。实验表明了算法的有效性。 相似文献
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针对目前各领域数据的复杂性、概念边界的模糊性、需求的不确定性,该文提出了一种基于云模型的模糊数据挖掘分析方法,采用了云模型在定性语言值和定量数值之间的不确定转换模型,为定性与定量相结合的数据处理分析提供了有力的手段。其中包括:对数据进行概念和特征的模糊识别;建立隶属云模型,刻画数字特征;通过统计、计算、分析得到实际需求的分类信息。实验结果表明了该分析方法能在大量的复杂数据空间中挖掘出有价值的信息,符合实际应用。 相似文献
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This paper presents a new approach for power quality time series data mining using S-transform based fuzzy expert system (FES). Initially the power signal time series disturbance data are pre-processed through an advanced signal processing tool such as S-transform and various statistical features are extracted, which are used as inputs to the fuzzy expert system for power quality event detection. The proposed expert system uses a data mining approach for assigning a certainty factor for each classification rule, thereby providing robustness to the rule in the presence of noise. Further to provide a very high degree of accuracy in pattern classification, both the Gaussian and trapezoidal membership functions of the concerned fuzzy sets are optimized using a fuzzy logic based adaptive particle swarm optimization (PSO) technique. The proposed hybrid PSO-fuzzy expert system (PSOFES) provides accurate classification rates even under noisy conditions compared to the existing techniques, which show the efficacy and robustness of the proposed algorithm for power quality time series data mining. 相似文献
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基于TD-FP-growth的模糊关联规则挖掘算法 总被引:1,自引:0,他引:1
提出一种基于TD_FP-growth的模糊关联规则挖掘算法.首先,使用3种t-模算子以及由其产生的蕴涵算子计算模糊频繁项的支持度和规则的蕴涵度,产生的关联规则能表示模糊项间的确定性和渐近性逻辑语义;然后,以事务的惟一标识为键值,散列存储每个事务相对FP-tree中每个结点所表示模糊项的隶属度,使TD-FP-growth适用于模糊频繁项的挖掘,并分析了算法的时间和空间复杂度;最后,实验结果表明该算法比基于apriori的模糊频繁项挖掘算法在时间方面更加有效.Abstract: An algorithm based on TD-FP-growth is proposed for mining fuzzy association rule, which uses three kinds of t-norm operator to calculate the support degree of fuzzy frequent items, and adopts corresponding implication operator to measure implication degree of fuzzy association rule.The association rule mined by the algorithm can express the logic semantic of graduality and certainty between fuzzy items.Each transaction's membership degree versus fuzzy item denoted by FP-tree's node is stored by hash technology, and each transaction's identifier is regarded as key value, which adapts TD-FP-growth to mine fuzzy frequent items.The time and space complexity of the algorithm are analyzed.The experimental results show that the algorithm is more effective than the fuzzy frequent item mining algorithm based on apriori in term of time. 相似文献
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针对传统数据挖掘中的“尖锐边界”问题,采用将模糊理论和关联规则挖掘技术相结合的思想,在改进传统Apriori算法的基础上,结合多层关联规则挖掘的方法,提出了一种模糊多层关联规则挖掘算法。对模糊多层关联规则挖掘的基本概念进行了定义,详细描述了模糊多层关联规则挖掘算法。最后用Visual FoxPro6.0语言实现了该算法程序,通过交易数据库挖掘实验表明算法是有效的。 相似文献
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随着大型数据库的不断涌现,如何从浩如烟海的数据中发现隐藏的有用知识,成为一个迫切需要研究的课题.因此,知识发现和数据挖掘应运而生.该文提出了数据挖掘的基本概念,数据挖掘是数据库技术、人工智能、机器学习、统计分析、模糊逻辑、模式识别和人工神经网络等多个学科相结合的产物,然后分析了数据挖掘一般算法的结构,并且对数据挖掘技术进行了详细分类,主要包括决策树技术、神经网络技术、粗集以及模糊集等十多项挖掘技术.最后讨论了数据挖掘在人工智能、电子商务应用和移动通信计算等方面的研究方向. 相似文献
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In real-world applications, transactions usually consist of quantitative values. Many fuzzy data mining approaches have thus been proposed for finding fuzzy association rules with the predefined minimum support from the give quantitative transactions. However, the common problems of those approaches are that an appropriate minimum support is hard to set, and the derived rules usually expose common-sense knowledge which may not be interesting in business point of view. In this paper, an algorithm for mining fuzzy coherent rules is proposed for overcoming those problems with the properties of propositional logic. It first transforms quantitative transactions into fuzzy sets. Then, those generated fuzzy sets are collected to generate candidate fuzzy coherent rules. Finally, contingency tables are calculated and used for checking those candidate fuzzy coherent rules satisfy the four criteria or not. If yes, it is a fuzzy coherent rule. Experiments on the foodmart dataset are also made to show the effectiveness of the proposed algorithm. 相似文献
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1 引言关联规则是指包含了一组对象间特定关联关系的规则。由于关联规则的挖掘有着广阔的应用背景,因此,人们对关联规则的挖掘算法作了大量的研究。从离散的布尔型变量、枚举型变量分析到连续的数值型变量分析;从平面的单事务项内部关系的分析到立体N维的多事务项之间关系的分析;从集中式的整体的静 相似文献
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Fuzzy sets and fuzzy logic research aims to bridge the gap between the crisp world of maths and the real world. Fuzzy set theory was applied to many different areas, from control to databases. Sometimes the number of events in an event-driven system may become very high and unmanageable. Therefore, it is very useful to organize the events into fuzzy event sets also introducing the benefits of fuzzy set theory. All the events that have occurred in a system can be stored in event histories which contain precious hidden information. We propose a method for automated construction of fuzzy event sets out of event histories via data mining techniques. The useful information hidden in the event history is extracted into a matrix called sequential proximity matrix. This matrix shows the proximities of events and it is used for fuzzy rule execution via similarity based event detection and construction of fuzzy event sets. Our application platform is active databases. We describe how fuzzy event sets can be exploited for similarity based event detection and fuzzy rule execution in active database systems 相似文献
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基于数据挖掘的煤矿安全信息管理模型的研究 总被引:1,自引:0,他引:1
基于对数据挖掘技术、粗糙集理论、模糊逻辑与神经网络算法的分析,文章提出了一种基于数据挖掘的煤矿安全信息管理模型的设计方案。该模型应用Web服务器注册技术和XML数据合成技术形成终端数据库,采用数据挖掘技术中的粗糙集理论和模糊逻辑与神经网络算法形成终端数据仓库,并对终端数据仓库进行统一分析、管理和维护,有效地提高了煤矿安全信息管理的效率。 相似文献