In this paper,a hybrid cache placement scheme for multihop wireless service networks is proposed.In this scheme,hot nodes in data transferring path are mined up by means of rout-ing navigation graph,and whole network ...In this paper,a hybrid cache placement scheme for multihop wireless service networks is proposed.In this scheme,hot nodes in data transferring path are mined up by means of rout-ing navigation graph,and whole network is covered with network clustering scheme.A hot node has been chosen for cache place-ment in each cluster,and the nodes within a cluster access cache data with no more than two hops.The cache placement scheme reduces data access latency and workload of the server node.It also reduces the average length of data transferring,which means that fewer nodes are involved.The network system energy con-sumption decreased as involved relay nodes reduced.The per-formance analysis shows that the scheme achieves significant system performance improvement in network environment,with a large number of nodes.展开更多
为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用...为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用500 k V、1 100 k V线路典型参数,针对并联电抗器布置对最大传输功率与最大传输效率的影响进行数值模拟分析。研究结果表明并联电抗器位置在发送端与中点串补电容之间或者接收端与中点串补电容之间变化时,最大传输功率与最大传输效率均随其位置变化而发生变化。同时,并联电抗器补偿度也会影响功率传输,随着并联电抗器补偿度的增加最大传输功率及最大传输效率均会降低。展开更多
基金Supported by the National Basic Research Program of China(973 Program)(2004CB318201)National High Technology Research and Development Program of China(863 Program)(2008AA01A402)Program for Changjiang Scholars and Innovative Research Team in University of China(IRT0725)
文摘In this paper,a hybrid cache placement scheme for multihop wireless service networks is proposed.In this scheme,hot nodes in data transferring path are mined up by means of rout-ing navigation graph,and whole network is covered with network clustering scheme.A hot node has been chosen for cache place-ment in each cluster,and the nodes within a cluster access cache data with no more than two hops.The cache placement scheme reduces data access latency and workload of the server node.It also reduces the average length of data transferring,which means that fewer nodes are involved.The network system energy con-sumption decreased as involved relay nodes reduced.The per-formance analysis shows that the scheme achieves significant system performance improvement in network environment,with a large number of nodes.
文摘为了研究长距离交流输电线路上并联电抗器布置对功率传输的影响,基于长距离超、特高压输电线路分布参数等效电路及二端口模型,分析了传输线路的最大传输功率及最大传输效率,推导了串补条件下两种并联电抗器布置方案的级联传输矩阵。采用500 k V、1 100 k V线路典型参数,针对并联电抗器布置对最大传输功率与最大传输效率的影响进行数值模拟分析。研究结果表明并联电抗器位置在发送端与中点串补电容之间或者接收端与中点串补电容之间变化时,最大传输功率与最大传输效率均随其位置变化而发生变化。同时,并联电抗器补偿度也会影响功率传输,随着并联电抗器补偿度的增加最大传输功率及最大传输效率均会降低。
