为了满足航天设备与计算机之间实时高带宽的数据传输需求,设计了一种基于PCIe3.0总线接口的高速数据传输系统,实现了数据通过读数板卡采集,然后以短突发或连续模式与主机之间的数据传输。该设计采用SG-DMA(scatter-gather direct memory...为了满足航天设备与计算机之间实时高带宽的数据传输需求,设计了一种基于PCIe3.0总线接口的高速数据传输系统,实现了数据通过读数板卡采集,然后以短突发或连续模式与主机之间的数据传输。该设计采用SG-DMA(scatter-gather direct memory access)数据传输方式,相比于传统Block DMA,降低了CPU资源利用率的同时减少了DMA的中断时间,提高了系统的整体性能。通过Qt Creator平台开发的上位机程序,在上位机软件界面测得PCIe写带宽可达4698 MBps,读带宽可达4797 MBps,PCIe平均总线利用率高达58.86%,完全满足工程中对高带宽数据传输的需求。展开更多
Facilities connectivity is a priority area for implementing the Belt and Road Initiative(BRI). The "China-Europe Railway Express"(CER Express) mode of transport organization links China with Europe by fast-t...Facilities connectivity is a priority area for implementing the Belt and Road Initiative(BRI). The "China-Europe Railway Express"(CER Express) mode of transport organization links China with Europe by fast-track cargo rail. A major instance of facilities connectivity related to this project is an important practical and symbolic instance of BRI transport cooperation. The strategic significance of the CER Express and a number of operational issues are outlined, as are the implications of limited market potential for costs and competitiveness. A "hub-and-spoke" organizational model that can generate scale economies and reduce costs is proposed. To examine the establishment of an organizational model of this kind, the economic hinterlands of Alashankou, Erenhot, and Manzhouli are identified under high-, mediumand low-cost scenarios using an analytical methodology that determines distance and economic costs, and a number of transport hubs(that include Harbin, Zhengzhou, and Lanzhou) are identified. The results found that the cost of the routes from 314 Chinese cities to Moscow is the lowest via Manzhouli in the high-and medium-cost scenarios, but the routes change via Erenhot in the low-cost scenario. A number of policy recommendations should follow up.展开更多
基金A Category of Strategic Priority Research National Program of the Chinese Academy of Sciences,No.XDA20010101National Natural Science Foundation of China,No.41722103Ministry of Education of Humanities and Social Science Youth Fund Project,No.17YJC790064
文摘Facilities connectivity is a priority area for implementing the Belt and Road Initiative(BRI). The "China-Europe Railway Express"(CER Express) mode of transport organization links China with Europe by fast-track cargo rail. A major instance of facilities connectivity related to this project is an important practical and symbolic instance of BRI transport cooperation. The strategic significance of the CER Express and a number of operational issues are outlined, as are the implications of limited market potential for costs and competitiveness. A "hub-and-spoke" organizational model that can generate scale economies and reduce costs is proposed. To examine the establishment of an organizational model of this kind, the economic hinterlands of Alashankou, Erenhot, and Manzhouli are identified under high-, mediumand low-cost scenarios using an analytical methodology that determines distance and economic costs, and a number of transport hubs(that include Harbin, Zhengzhou, and Lanzhou) are identified. The results found that the cost of the routes from 314 Chinese cities to Moscow is the lowest via Manzhouli in the high-and medium-cost scenarios, but the routes change via Erenhot in the low-cost scenario. A number of policy recommendations should follow up.