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基于NSCT和IA–AP聚类的直流电缆局放信号图特征提取 被引量:5
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作者 许永鹏 杨丰源 +3 位作者 段大鹏 钱勇 盛戈皞 江秀臣 《高电压技术》 EI CAS CSCD 北大核心 2017年第2期438-445,共8页
对直流交联聚乙烯(XLPE)电缆局放信号进行特征提取是故障诊断前的关键步骤。当特征提取在小波域进行时,存在提取的特征参数有限、识别准确率低的问题。因而提出了一种基于非下采样下轮廓波变换(NSCT)和免疫算法(IA)优化仿射传播(AP)聚... 对直流交联聚乙烯(XLPE)电缆局放信号进行特征提取是故障诊断前的关键步骤。当特征提取在小波域进行时,存在提取的特征参数有限、识别准确率低的问题。因而提出了一种基于非下采样下轮廓波变换(NSCT)和免疫算法(IA)优化仿射传播(AP)聚类的直流XLPE电缆局放信号图特征提取方法。首先采用NSCT提取信号子带系数,并通过IA-AP聚类将全部系数进行分类,计算对应的信号熵和马氏距离等特征参数,最后通过不同的分解层数、聚类个数、训练样本对缺陷类型进行对比分析。实验结果表明:该方法能够应用于直流XLPE电缆局放信号的特征提取研究,相同分类器下,其识别率比小波变换法提高14%以上。该结论为直流XLPE电缆局放信号特征提取提供了新思路,有利于后续绝缘缺陷识别研究。 展开更多
关键词 直流电缆 局放信号图 特征提取 NSCT ia-ap
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Proteogenomic review of the changes in primate apoC-I during evolution
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作者 Donald L. PUPPIONE Julian P. WHITELEGGE 《Frontiers in Biology》 CAS CSCD 2013年第5期533-548,共16页
Apolipoprotein C-I has evolved more rapidly than any of the other soluble apolipoproteins. During the course of primate evolution, the gene for this apolipoprotein was duplicated. Prompted by our observation that the ... Apolipoprotein C-I has evolved more rapidly than any of the other soluble apolipoproteins. During the course of primate evolution, the gene for this apolipoprotein was duplicated. Prompted by our observation that the two resulting genes encode two distinct forms of apoC-I in great apes, we have reviewed both the genomic and proteomic data to examine what changes have occurred during the course of primate evolution. We have found data showing that one of the duplicated genes, known to be a pseudogene in humans, was also a pseudogene in Denisovans and Neandertals. Using genomic and proteomic data for primates, we will provide in this review evidence that the duplication took place after the divergence of New World monkeys from the human lineage and that the formation of the pseudogene took place after the divergence of the bonobos and chimpanzees from the human lineage. 展开更多
关键词 mass spectrometry apoC-IA apoC-IB APES Old World monkeys New World monkeys
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