为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发...为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发或正在转发的网络负载按照一定的比例分配到主路由和旁路由上,从而实现延长整个网络生存期的目的。仿真实验结果表明,P_AODV协议在延长网络寿命方面明显优于AODV协议。展开更多
A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inne...A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inner mechanism of operation modes.For the MHD generator with a uniform constant magnetic field,a specific critical electric field E_(cr) is required to decelerate a supersonic entrance flow into a subsonic exit flow.Otherwise,the generator works in a steady mode with a larger electric field than E_(cr) in which a steady supersonic flow is provided at the exit,or the generator works in a choked mode with a smaller electric field than E_(cr) in which the supersonic entrance flow is choked in the channel.The detailed flow field characteristics in different operation modes are discussed,demonstrating the relationship of operation modes with electromagnetic fields.展开更多
文摘为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发或正在转发的网络负载按照一定的比例分配到主路由和旁路由上,从而实现延长整个网络生存期的目的。仿真实验结果表明,P_AODV协议在延长网络寿命方面明显优于AODV协议。
基金supported in part by the National Natural Science Foundation of China under Grant 51006027,Grant 50925625,and Grant 51437002the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology under Grant HIT.NSRIF.2009091the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant 20102302120047
文摘A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inner mechanism of operation modes.For the MHD generator with a uniform constant magnetic field,a specific critical electric field E_(cr) is required to decelerate a supersonic entrance flow into a subsonic exit flow.Otherwise,the generator works in a steady mode with a larger electric field than E_(cr) in which a steady supersonic flow is provided at the exit,or the generator works in a choked mode with a smaller electric field than E_(cr) in which the supersonic entrance flow is choked in the channel.The detailed flow field characteristics in different operation modes are discussed,demonstrating the relationship of operation modes with electromagnetic fields.
