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Hierarchical data replication strategy to improve performance in cloud computing

Frontiers of Computer Science 2021年第2期15卷 63-79页

作者： Najme MANSOURI Mohammad Masoud JAVIDI Behnam Mohammad Hasani ZADE Department of Computer Science Shahid Bahonar University of KermanKerman76169-14111Iran Mahani Mathematical Research Center Shahid Bahonar University of KermanKerman76169-14111Iran

Cloud computing environment is getting more interesting as a new trend of data *** replication has been widely applied to improve data access in distributed systems such as Grid and ***,due to the finite storage capacity of each site,copies that are useful for future jobs can be wastefully deleted and replaced with less valuable ***,it is considerable to have appropriate replication strategy that can dynamically store the replicas while satisfying quality of service(QoS)requirements and storage capacity *** this paper,we present a dynamic replication algorithm,named hierarchical data replication strategy(HDRS).HDRS consists of the replica creation that can adaptively increase replicas based on exponential growth or decay rate,the replica placement according to the access load and labeling technique,and finally the replica replacement based on the value of file in the *** evaluate different dynamic data replication methods using CloudSim *** demonstrate that HDRS can reduce response time and bandwidth usage compared with other *** means that the HDRS can determine a popular file and replicates it to the best *** method avoids useless replications and decreases access latency by balancing the load of sites.

关键词： cloud computing data replication multi-tier architecture simulation load balance

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Research on precise orbit determination time synchronization and extended application of LEO constellation based on GNSS

Research on precise orbit determination time synchronization...

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第十三届中国卫星导航年会

作者： Fang Yao Jing Guo Chao Yang

The four major satellite navigation suppliers announced by the International Committee on Global Navigation Satellite Systems（ICG） include GPS of the United States, GLONASS of Russia, BDS of China and Galileo of Europe. The development of the four satellite navigation systems not only changes the trajectory of human activities on the earth’s surface, but also provides a cheap and efficient way for the accurate positioning and timing of other aircraft. Due to its low orbit and fast speed, LEO satellite naturally has the characteristics of strong landing power, fast revisit cycle, high ground resolution and fast observation geometry change, which makes it attracted much attention in the fields of mobile communication, remote sensing detection and navigation enhancement, and so on. In addition to the relatively weak irradiation environment, low launch cost and economic advantages, LEO constellation has become a direction that could not be ignored in various fields in recent years. Based on GNSS technology, this paper studied the theoretical method and achievable accuracy of precise orbit determination and time synchronization of LEO constellation. On this basis, the degraded backup effect and application suggestions of LEO constellation under multi-layer architecture including GNSS system were studied.

关键词： LEO constellation GNSS technology multi-tier architecture Orbit determination and time synchronization Expand application

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