Car washing line is an important facility in the subway vehicle base that is responsible for cleaning the exterior surface of trains on a regular basis. This paper introduces three common design schemes of car washing...Car washing line is an important facility in the subway vehicle base that is responsible for cleaning the exterior surface of trains on a regular basis. This paper introduces three common design schemes of car washing lines in domestic subway vehicle bases, calculates and compares their working efficiency, and analyzes the characteristics and applicability of the three design schemes, so as to provide reference for the subsequent design of car washing lines in subway vehicle bases.展开更多
Unmanned aerial vehicle base stations(UAV-BSs)can provide a fast network deployment scheme for heterogeneous networks.However,unmanned aerial vehicle(UAV)has limited capability and cannot assist the base station(BS)we...Unmanned aerial vehicle base stations(UAV-BSs)can provide a fast network deployment scheme for heterogeneous networks.However,unmanned aerial vehicle(UAV)has limited capability and cannot assist the base station(BS)well.The ability of a UAV to assist the BSs is limited,and the cluster deployment relies on the leading UAV.The dispersive deployment of multiple UAVs(multi-UAVs)need a macro base station(MBS)to determine their positions to prevent collisions or interference.Therefore,a distributed cooperative deployment scheme is proposed for UAVs to solve this problem.The scheme can increase the ability of UAVs to assist users and reduce the pressure on BSs to deploy UAVs.Firstly,the randomly distributed users are pre-clustered.Then the placement problem was modeled as a circle expansion problem and a pre-clustering radius expansion algorithm was proposed.Under the constraint of users'data rates,it provides services for more users.Finally,the proposed algorithm was compared with the density-aware placement algorithm.The simulation results show that the proposed algorithm can provide services for more users and improve the coverage rate of users while ensuring the data rates.展开更多
文摘Car washing line is an important facility in the subway vehicle base that is responsible for cleaning the exterior surface of trains on a regular basis. This paper introduces three common design schemes of car washing lines in domestic subway vehicle bases, calculates and compares their working efficiency, and analyzes the characteristics and applicability of the three design schemes, so as to provide reference for the subsequent design of car washing lines in subway vehicle bases.
基金supported by the National Natural Science Foundation of China(61771070,61671088)。
文摘Unmanned aerial vehicle base stations(UAV-BSs)can provide a fast network deployment scheme for heterogeneous networks.However,unmanned aerial vehicle(UAV)has limited capability and cannot assist the base station(BS)well.The ability of a UAV to assist the BSs is limited,and the cluster deployment relies on the leading UAV.The dispersive deployment of multiple UAVs(multi-UAVs)need a macro base station(MBS)to determine their positions to prevent collisions or interference.Therefore,a distributed cooperative deployment scheme is proposed for UAVs to solve this problem.The scheme can increase the ability of UAVs to assist users and reduce the pressure on BSs to deploy UAVs.Firstly,the randomly distributed users are pre-clustered.Then the placement problem was modeled as a circle expansion problem and a pre-clustering radius expansion algorithm was proposed.Under the constraint of users'data rates,it provides services for more users.Finally,the proposed algorithm was compared with the density-aware placement algorithm.The simulation results show that the proposed algorithm can provide services for more users and improve the coverage rate of users while ensuring the data rates.
