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数据仓库中的维数据或度量数据都是确定的,其多维分析也是基于确定数据展开的。在现实中,由于环境的复杂与不确定性,常常需要对模糊数据进行多维分析。文章利用隶属度函数实现确定数据的模糊化,形成基于模糊数据的数据立方体,用以展开多维分析。 相似文献
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孙志达 《化工自动化及仪表》2012,39(6):714-715,726
采用PLC设计了一种基于模糊控制的物料升温系统,克服了由于升温过快造成产品不舍格的缺点,提高了生产效率和产品质量。 相似文献
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Yiqian Cui Junyou Shi Zili Wang 《International Journal of Circuit Theory and Applications》2016,44(1):240-260
Fault diagnosis of analog circuits is more challenging compared with digital circuits as a result of the parametric deviation and the difficulty in signal discretization. There still lacks effective approaches to realize reliable fault detection and isolation for a comprehensive diagnosis. A new fault diagnosis technique called multi‐valued Fisher's fuzzy decision tree (MFFDT) is proposed in this paper to solve the problem. This technique uses the decision tree as the diagnosis model and incorporates the Fisher's linear discriminant principles. The fuzzification mechanism is devised to discretize the input monitoring data. The proposed MFFDT method is composed of two aspects: decision tree training and real fault diagnosis processes. The former uses the benchmark data to train a decision tree, while the latter sends the monitoring data into the decision tree to generate diagnosis results. The proposed method is validated using simulated data and the real‐time data for an active filter circuit and an audio amplifying circuit. The comparative analysis is also presented to evaluate diagnosis performances. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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提出与常规离散模糊化及相应控制算法截然不同的对称模糊化和含对称模糊数的控制规则在线自调整方法。设计了相应的规则-比例因子自调节模糊控制系统,并应用于切削参数变化的铣削力在线控制。试验结果表明,所提出的方法有效,具有信息补偿,鲁棒性和适应性较强等特点,为加工过程自适应模糊控制了新思路。 相似文献
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Vuqar Mirzakhanov 《人工智能实验与理论杂志》2019,31(1):117-136
A modification of the Wu–Mendel approach for linguistic summarisation (LS) of datasets is proposed in this paper. The proposed modification is a fuzzification-tuning technique that tunes the originally user defined specification of a fuzzy linguistic variable for each initial dataset attribute in the Wu–Mendel approach. The implication of the proposed technique in LS significantly decreases the complexity of linguistic summaries in terms of the number of rules and linguistic terms without the essential loss in accuracy, which is verified by carrying out the corresponding experimental analysis involving several real-world datasets. 相似文献
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基于知识的模糊多层感知器 总被引:1,自引:0,他引:1
通过与标准模糊多层感知器的对比文章描述了基于知识的模糊多层感知器的具体结构,讲述了如何利用先验知识对连接权进行初始化以及如何从已经过训练的网络中抽取推理规则,文章最后指出这种网络在训练效率和识别性能上优于标准模糊多层感知器。 相似文献
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在模糊决策树归纳过程中,数据的模糊化预处理通常使用三角形隶属函数,该隶属函数的中心点参数将决定数据模糊化的效果,进而影响模糊决策树的执行效率、精度和规模。Kohonen'sfeature-maps聚类算法能够用来选取连续属性值的中心点。实验研究表明,该算法选取的中心点使模糊子集之间的覆盖范围不再相同,因而能够更合理地表示模糊概念之间的重叠关系。通过与其它算法比较证明该算法使模糊决策树可以获得更高的分类精度。 相似文献
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针对购房者购房因素的模糊性,通过研究模糊理论与清晰条件的关系,给出了房产交易中的容忍度、隶属函数和门槛值等. 相似文献
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