Dome A,Antarctica,has been thought to be one of the best astronomical sites on the Earth for decades.Since it was first visited by astronomers in 2008,dozens of facilities for astronomical observation and site testing...Dome A,Antarctica,has been thought to be one of the best astronomical sites on the Earth for decades.Since it was first visited by astronomers in 2008,dozens of facilities for astronomical observation and site testing were deployed.Due to its special geographical location,the data and message exchange between Dome A and the domestic control center could only depend on Iridium.Because the link bandwidth of Iridium is extremely limited,the network traffic cost is quite expensive and the network is rather unstable,the commonly used data transfer tools,such as rsync and scp,are not suitable in this case.In this paper,we design and implement a data transfer tool called NBFTP(narrow bandwidth file transfer protocol)for the astronomical observation of Dome A.NBFTP uses a uniform interface to arrange all types of data and matches specific transmission schemes for different data types according to rules.Break-point resuming and extensibility functions are also implemented.Our experimental results show that NBFTP consumes 60%less network traffic than rsync when detecting the data pending to be transferred.When transferring small files of 1 KB,the network traffic consumption of NBFTP is 40%less than rsync.However,as the file size increases,the network traffic consumption of NBFTP tends to approach rsync,but it is still smaller than rsync.展开更多
In view of the demand for intelligent and information-based management of sampling points for agricultural environmental monitoring,taking the cloud platform as the information carrier,combined with the advantages of ...In view of the demand for intelligent and information-based management of sampling points for agricultural environmental monitoring,taking the cloud platform as the information carrier,combined with the advantages of GIS development interface technology on the Web side and intelligent handheld system development technology,the overall structure of the sample deployment control collection and sampling management system was designed,and a program flow method for the accurate perception of sampling points and the secondary evaluation of spare sampling points caused by geographic factors was proposed.It is expected to realize the intelligent and information-based sampling work from deployment to collection,and effectively increase the work efficiency.In addition,it is expected to provide a good data interface program for the input and output of related information at the Internet of Things(IoT)level for subsequent related data research.展开更多
基金supported by the Joint Research Fund in Astronomy(U1931130)under the cooperative agreement between the National Natural Science Foundation of China(NSFC)and the Chinese Academy of Sciences(CAS)support from NFSC(Grant Nos.11873010and 117330037)the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes,and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administrated by the CAS。
文摘Dome A,Antarctica,has been thought to be one of the best astronomical sites on the Earth for decades.Since it was first visited by astronomers in 2008,dozens of facilities for astronomical observation and site testing were deployed.Due to its special geographical location,the data and message exchange between Dome A and the domestic control center could only depend on Iridium.Because the link bandwidth of Iridium is extremely limited,the network traffic cost is quite expensive and the network is rather unstable,the commonly used data transfer tools,such as rsync and scp,are not suitable in this case.In this paper,we design and implement a data transfer tool called NBFTP(narrow bandwidth file transfer protocol)for the astronomical observation of Dome A.NBFTP uses a uniform interface to arrange all types of data and matches specific transmission schemes for different data types according to rules.Break-point resuming and extensibility functions are also implemented.Our experimental results show that NBFTP consumes 60%less network traffic than rsync when detecting the data pending to be transferred.When transferring small files of 1 KB,the network traffic consumption of NBFTP is 40%less than rsync.However,as the file size increases,the network traffic consumption of NBFTP tends to approach rsync,but it is still smaller than rsync.
文摘In view of the demand for intelligent and information-based management of sampling points for agricultural environmental monitoring,taking the cloud platform as the information carrier,combined with the advantages of GIS development interface technology on the Web side and intelligent handheld system development technology,the overall structure of the sample deployment control collection and sampling management system was designed,and a program flow method for the accurate perception of sampling points and the secondary evaluation of spare sampling points caused by geographic factors was proposed.It is expected to realize the intelligent and information-based sampling work from deployment to collection,and effectively increase the work efficiency.In addition,it is expected to provide a good data interface program for the input and output of related information at the Internet of Things(IoT)level for subsequent related data research.
