In this paper,a dedicated synchrotron radiation （SR） mode for the BEPCⅡ with an emittance of 85 nm has been designed,including the linear lattice,chromaticity correction and dynamic aperture optimization.The emitta...In this paper,a dedicated synchrotron radiation （SR） mode for the BEPCⅡ with an emittance of 85 nm has been designed,including the linear lattice,chromaticity correction and dynamic aperture optimization.The emittance of the new mode is about 60% of the previous mode used for routine operation of the BEPCⅡ .The effect of wigglers on the linear lattice was compensated and the total dynamic aperture including the wigglers’ nonlinear effect was estimated.The preliminary commissioning at the end of 2008 and the formal operation with the new mode confirmed its merits.展开更多
With the rapid development of vehicular access network,three different communication modes have emerged as the fundamental technologies in cellular V2X,i.e.,cellular mode,reuse mode,and dedicated mode,through differen...With the rapid development of vehicular access network,three different communication modes have emerged as the fundamental technologies in cellular V2X,i.e.,cellular mode,reuse mode,and dedicated mode,through different spectrum sharing strategies.However,how to conduct the multi-mode access management for cellular V2X is challenging considering the heterogeneity of network resource and the diverse vehicular services demands.In this paper,we investigate a software defined multi-mode access management framework in cellular V2X,which is capable of providing flexibility and programmability for dynamic spectrum sharing in vehicular access.We first conduct the performance analysis of multi-mode communications in cellular V2X.Then,we design an analytic hierarchy process(AHP)based evolutionary game to optimize the multi-mode access management solution,in which four performance indicators are jointly considered,including transmission rate,interference,transmission delay,and energy consumption.Extensive experimental simulations have validated the superiority of the proposed algorithm,and illustrated the impact of different vehicle access schemes,signal-to-interference-plus-noise ratio(SINR)threshold and other parameters on the performance of cellular V2X.展开更多
基金Supported by National Natural Science Foundation of China (10525525, 10775154)
文摘In this paper,a dedicated synchrotron radiation （SR） mode for the BEPCⅡ with an emittance of 85 nm has been designed,including the linear lattice,chromaticity correction and dynamic aperture optimization.The emittance of the new mode is about 60% of the previous mode used for routine operation of the BEPCⅡ .The effect of wigglers on the linear lattice was compensated and the total dynamic aperture including the wigglers’ nonlinear effect was estimated.The preliminary commissioning at the end of 2008 and the formal operation with the new mode confirmed its merits.
基金supported by the National Natural Science Foundation of China under Grant 61871211。
文摘With the rapid development of vehicular access network,three different communication modes have emerged as the fundamental technologies in cellular V2X,i.e.,cellular mode,reuse mode,and dedicated mode,through different spectrum sharing strategies.However,how to conduct the multi-mode access management for cellular V2X is challenging considering the heterogeneity of network resource and the diverse vehicular services demands.In this paper,we investigate a software defined multi-mode access management framework in cellular V2X,which is capable of providing flexibility and programmability for dynamic spectrum sharing in vehicular access.We first conduct the performance analysis of multi-mode communications in cellular V2X.Then,we design an analytic hierarchy process(AHP)based evolutionary game to optimize the multi-mode access management solution,in which four performance indicators are jointly considered,including transmission rate,interference,transmission delay,and energy consumption.Extensive experimental simulations have validated the superiority of the proposed algorithm,and illustrated the impact of different vehicle access schemes,signal-to-interference-plus-noise ratio(SINR)threshold and other parameters on the performance of cellular V2X.
