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分布式环境下大规模维表关联技术优化 被引量:2
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作者 赵恒泰 赵宇海 +3 位作者 袁野 季航旭 乔百友 王国仁 《计算机科学与探索》 CSCD 北大核心 2022年第2期337-347,共11页
分布式环境下大规模维表关联技术是当前在线大数据分析的关键技术之一,其广泛应用于实时推荐、实时分析等领域。维表关联是指将流数据和离线存储的维表数据进行关联,并根据这种关联进行数据处理。首先,对已有的维表连接技术方案进行了研... 分布式环境下大规模维表关联技术是当前在线大数据分析的关键技术之一,其广泛应用于实时推荐、实时分析等领域。维表关联是指将流数据和离线存储的维表数据进行关联,并根据这种关联进行数据处理。首先,对已有的维表连接技术方案进行了研究,调研了相关的优化技术和主流分布式引擎的设计路线,主要通过优化维表数据查询提高性能,但传统的优化方式受到维表规模和数据流速的限制。其次,针对已有优化技术在分布式环境下对集群整体考虑使用的不足,提出了适用于对离线的批数据和实时的流数据进行混合计算的计算模型,然后提出了一种单点读取维表数据,切分后进行分发和计算的维表关联数据方式,并优化了维表关联计算逻辑,使之能适应更高的维表规模,且不再局限于对数据的连接。最后,在流计算引擎Apache Flink上实现了提出的维表关联技术和传统维表关联技术,通过实验在阿里巴巴“双十一”产生的数据上对吞吐量和延迟进行了对比,证明了对面向分布式流计算的维表关联技术的优化的有效性。 展开更多
关键词 分布式计算 维表关联 缓存技术 Apache Flink
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Degradation Process of Coated Tinplate by Phase Space Reconstruction Theory 被引量:4
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作者 石江波 夏大海 +2 位作者 王吉会 周超 刘彦宏 《Transactions of Tianjin University》 EI CAS 2013年第2期92-97,共6页
The degradation process of organosol coated tinplate in beverage was investigated by electrochemical noise (EN) technique combined with morphology characterization.EN data were analyzed using phase space reconstructio... The degradation process of organosol coated tinplate in beverage was investigated by electrochemical noise (EN) technique combined with morphology characterization.EN data were analyzed using phase space reconstruction theory.With the correlation dimensions obtained from the phase space reconstruction,the chaotic behavior of EN was quantitatively evaluated.The results show that both electrochemical potential noise (EPN) and electrochemical current noise (ECN) have chaotic properties.The correlation dimensions of EPN increase with corrosion extent,while those of ECN seem nearly unchanged.The increased correlation dimensions of EPN during the degradation process are associated with the increased susceptibility to local corrosion. 展开更多
关键词 phase space reconstruction CHAOS electrochemical potential noise electrochemical current noise correlation dimension organic coating
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Characterizing Quantum Correlations in Arbitrary-Dimensional Bipartite Systems Using Hurwitz's Theory
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作者 LI Hui 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第3期273-280,共8页
Quantum correlations play vital roles in the quantum features in quantum information processing tasks. Among the measures of quantum correlations, quantum discord (QD) and entanglement of formation (EOF) axe two s... Quantum correlations play vital roles in the quantum features in quantum information processing tasks. Among the measures of quantum correlations, quantum discord (QD) and entanglement of formation (EOF) axe two significant ones. Recent research has shown that there exists a relation between QD and EOF, which makes QD more significant in quantum information theory. However, until now, there exists no general method of chaxaeterizing quantum discord in high-dimensional quantum systems. In this paper, we have proposed a general method for calculating quantum discord in axbitraxy-dimensionM bipaxtite quantum systems in terms of Hurwitz's theory. Applications including the Werner state, the spin-1 XXZ model thermal equilibrium state, the Horodecki state, and the separable-bound-free entanglement state are investigated. We present the method of obtaining the EOF of axbitraxy-dimensional bipaxtite quantum states via purification, and the relations.hip between QD and EOF. 展开更多
关键词 quantum correlation quantum discord entanglement of formation
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