排序方式: 共有21条查询结果,搜索用时 15 毫秒
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2010年以来,重庆电信强化服务意识、提升管理效率和运营能力,进一步构建三级管理体制,采取有力措施打造营维融合体系,以适应全业务经营发展的需要。重庆通信服务公司采取有效措施,积极支撑重庆电信运营体系建设。 相似文献
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以前评价长丝或短纤纱外观不匀现象时是靠肉眼检查或通过针织物检查来进行的,日本东丽工程公司研制的FPD~500型形态不均匀度测试仪能够连续准确地对此进行测定,现简要介绍如下: 一、特点 1、以光学的形式,能够连续、准确地测试出长丝或短纤纱表现外径的纵向变化。 相似文献
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特征选择算法研究综述 总被引:8,自引:0,他引:8
特征选择是当前信息领域,尤其是模式识别领域的研究热点.本文从不同角度对特征选择算法进行分类,概述特征选择技术发展的各个分支及发展态势,指出理论研究和实际应用中所存在的一些困难和亟待解决的问题.然后从算法实用性角度出发,结合机器学习的观点,探讨应用支持向量机技术进行特征选择的研究发展思路. 相似文献
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基于结合参数整定和特征选择策略的模糊支持向量机的故障诊断 总被引:4,自引:0,他引:4
This study describes a classification methodology based on support vector machines (SVMs), which offer superior classification performance for fault diagnosis in chemical process engineering. The method incorporates an efficient parameter tuning procedure (based on minimization of radius/margin bound for SVM's leave-one-out errors) into a multi-class classification strategy using a fuzzy decision factor, which is named fuzzy support vector machine (FSVM). The datasets generated from the Tennessee Eastman process (TEP) simulator were used to evaluate the classification performance. To decrease the negative influence of the auto-correlated and irrelevant variables, a key variable identification procedure using recursive feature elimination, based on the SVM is implemented, with time lags incorporated, before every classifier is trained, and the number of relatively important variables to every classifier is basically determined by 10-fold cross-validation. Performance comparisons are implemented among several kinds of multi-class decision machines, by which the effectiveness of the proposed approach is proved. 相似文献
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