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Cross-correlation analysis of crude oil and new energy markets: A new perspective based on carbon emission market 被引量:1
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作者 FENG You-shuai ling mei-jun 《Ecological Economy》 2019年第1期2-18,共17页
Taking the return series of the EU carbon allowance price, WTI crude oil price, the European renewable energy index and Shenzhen carbon emission price, Daqing crude oil price, the China securities new energy index as ... Taking the return series of the EU carbon allowance price, WTI crude oil price, the European renewable energy index and Shenzhen carbon emission price, Daqing crude oil price, the China securities new energy index as sample data, the multifractal detrend cross-correlation analysis method(MF-DCCA)is used to research the dynamic cross-correlation relationships among the carbon emission market, crude oil market and the new energy market in Europe and China and the source of the multifractality. The empirical analysis shows that the cross-correlations among the carbon emission market, crude oil market and new energy market in Europe and China have all significant multifractal characteristics. Moreover, the multifractal strength of cross-correlation between the carbon emission market and crude oil market is less than that between the carbon emission market and new energy market in Europe. The Chinese market is the opposite. In addition, the multifractal strength of cross-correlation between the crude oil market and new energy market in Europe is more than that between the crude oil market and new energy market in China. It is also found that the long-range correlation of the sequences themselves and the fat-tailed distribution in fluctuations are the common causes of the multifractality, and the fat-tailed in fluctuations distribution contributes more to the multifractals of the series. 展开更多
关键词 carbon emission market crude oil market new energy market CROSS-CORRELATION multifractal statistical analysis
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基于LDA模型的高校教育云平台设计与研究
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作者 凌美君 辛婧 《计算机技术与发展》 2021年第12期135-140,共6页
随着互联网技术的飞速发展,参与在线学习的群体日益增多,在线学习、互动和交流的活动越来越频繁,在线教育作为一种新型的教育模式逐步形成。一方面,它给学生带来了极大的方便,并且提供了一种新的学习方式;另一方面,也对学习资源的快速... 随着互联网技术的飞速发展,参与在线学习的群体日益增多,在线学习、互动和交流的活动越来越频繁,在线教育作为一种新型的教育模式逐步形成。一方面,它给学生带来了极大的方便,并且提供了一种新的学习方式;另一方面,也对学习资源的快速增长带来的“信息过载”现象提出了解决方案。文中在云计算环境中采用基于分层的体系化设计思路,深入开展了高校教育云的需求分析和架构设计。结合Dubbo微服务框架和分布式数据库技术,以服务化、组件化为系统核心,基于LDA用户兴趣模型分析用户对教育主题的偏好程度,确定主题与在线教育课程的相似度系数,从而实现对用户的教育课程精准推送。系统上线运行结果表明,使用基于LDA模型的课程推荐较传统的推荐方法更为精准,主题集中度也更高,更加适合在线的教育课程推荐。 展开更多
关键词 LDA模型 Dubbo微服务 课程推荐 教育云平台 体系设计
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