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Proposal of Cloud Computing is tightly coupled withlow cost. Reduction of cost is considered as an importantadvantage of Cloud. However, there are no availabletools proper for cost calculation and analysis in Cloudenvironment. This paper presents our efforts towardsfilling in the gap. We format suits of metrics and formulasfor the calculation of Cloud Total(More)
Hadoop distributed file system (HDFS) becomes a representative cloud storage platform, benefiting from its reliable, scalable and low-cost storage capability. HDFS has been utilized in BlueSky, one of the most prevalent e-Learning resource sharing systems in China, to store and share courseware majorly in the form of PowerPoint (PPT) files and video clips.(More)
Hadoop is widely adopted to support data intensive distributed applications. Many of them are mission critical and require inherent high availability of Hadoop. Unfortunately, Hadoop has no high availability support yet, and it is not trivial to enhance Hadoop. Based on thorough investigation of Hadoop, this paper proposes a metadata replication based(More)
The recently published genome of Brassica napus offers for the first time the opportunity to gain insights into the genomic organization and the evolution of miRNAs in oilseed rape. In this study, 12 small RNA libraries from two B. napus cultivars (Tapidor and Ningyou7) and their four double-haploid lines were sequenced, employing the newly sequenced B.(More)
Whole-genome re-sequencing of weedy rice from southern China reveals that weedy rice can originate from hybridization of domesticated indica and japonica rice. Weedy rice (Oryza sativa f. spontanea Rosh.), which harbors phenotypes of both wild and domesticated rice, has become one of the most notorious weeds in rice fields worldwide. While its formation is(More)
Cloud platforms offer resource utilization as on demand service, which lays the foundation for applications to scale during runtime. However, just-in-time scalability is not achieved by simply deploying applications to cloud platforms. Existing approaches require developers to rewrite their applications to leverage the on-demand resource utilization, thus(More)
The configuration of a service-based system has a significant impact on the nonfunctional requirements of the system as a whole. However, finding the best configuration is very challenging and sometimes impossible for administrators because so many factors have to be considered. More importantly, a service based system has to be frequently reconfigured to(More)
Current smartphones are integrated with rich sensors, which provides a good opportunity for the smartphone sensor data mining. By mining these data, we are able to analyze the user's behaviors. This paper describes HARLib, a human activity recognition library on the Android operating system. We use accelerometer built-in smartphone to recognize the user's(More)
A generalized declarative constraint framework is proposed in this paper to address challenges of applying constraints to model-driven SOA deployment and configuration. By representing deployment metamodel and domain knowledge as patterns, constraints can be easily described, automatically validated and analyzed. This framework reduces the(More)