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基于异常检测的K-means改进算法研究 被引量:6
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作者 薛晨杰 林婷薇 《软件导刊》 2019年第4期74-78,共5页
K-means算法作为较为普遍的聚类算法,聚类效果受孤立点、噪声点和初始聚类中心影响较大。结合Isolation Forest算法计算数据中每个样本的异常度系数,根据离群值过滤比例计算得到异常度系数阈值,对高度异常值加以隔离,并对隔离后的数据... K-means算法作为较为普遍的聚类算法,聚类效果受孤立点、噪声点和初始聚类中心影响较大。结合Isolation Forest算法计算数据中每个样本的异常度系数,根据离群值过滤比例计算得到异常度系数阈值,对高度异常值加以隔离,并对隔离后的数据集使用平均插值法求得初始聚类中心。运用改进K-means算法对真实数据集进行聚类分析,与此同时,通过比较多个离群值过滤比例下的聚类结果,找到离群值过滤比例的最优取值。仿真结果表明,相比于原始算法,新算法显著提升了聚类准确性,聚类效果更佳。 展开更多
关键词 K-MEANS算法 聚类算法 异常检测 异常度系数 离群过滤比例
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The Saturation Model and Its Application on Partition Equilibria for Main Types of Heterogeneous Systems
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作者 Jozef Siska 《Journal of Chemistry and Chemical Engineering》 2011年第3期269-282,共14页
Within the model, a definition of novel saturation and dilution degree is presented. A novel expression of equilibrium constant is derived by including interactions between components to reversible processes running b... Within the model, a definition of novel saturation and dilution degree is presented. A novel expression of equilibrium constant is derived by including interactions between components to reversible processes running between the components particles under a dynamic equilibrium. For partition equilibria, three types of basic processes are proposed and corresponding partition isotherms were derived. The isotherms are applied to the components partition between two phases for main heterogenous systems types. For construction and prediction ternary phase diagrams, a new method, the Component Binding by Saturation Model (CBSM) method, is proposed. Applying the partition isotherms derived, new extraction, evaporation and adsorption isotherms are expressed. Directly, or after an approximation, from the new adsorption isotherms, well-known adsorption isotherms are obtained. 展开更多
关键词 Equilibrium PARTITION ISOTHERM phase diagram extraction EVAPORATION adsorption.
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