Problems of the current IGMP mechanism were identified, such as unnecessary periodic probing of hosts and leave latency, which wastes bandwidth and cause more traffic and overhead. Alternative mechanism that preserve ...Problems of the current IGMP mechanism were identified, such as unnecessary periodic probing of hosts and leave latency, which wastes bandwidth and cause more traffic and overhead. Alternative mechanism that preserve the IP multicast model but employ join/leave messages to track local group membership for broadcast LANs (shared medium LANs) was proposed in this paper. We describe the implementation requirements of the new mechanism and compare it to existing one, demonstrating that join/leave approach is uniformly superior for the environment of broadcast LANs.展开更多
基于稳定网的数据流连接算法已有很多研究成果,但在实际应用中,还需要处理不同速率网络下的查询连接,这使得目前流行的基于稳定数据流且内存分配固定环境下的连接算法难以适用。介绍了一种在非对称数据率网络下的无阻塞排序归并连接算法...基于稳定网的数据流连接算法已有很多研究成果,但在实际应用中,还需要处理不同速率网络下的查询连接,这使得目前流行的基于稳定数据流且内存分配固定环境下的连接算法难以适用。介绍了一种在非对称数据率网络下的无阻塞排序归并连接算法SMA。SMA算法的连接运算分为两阶段:join during run creation和join during merge,第一阶段可用于网络无阻塞情况下通过内存刷新策略来生成头批连接结果,第二阶段用于数据源受阻时借助外存驻留数据继续生成查询连接结果,从而保证了连接结果产生的无阻塞性。试验证明,SMA对等值和空间连接效率很高。展开更多
Dr.Xiyun Yan obtained her B.S.degree in 1983,from the Henan Medical College,and then studied cell biology in Professor Shizhang Bei’s lab in the Institute of Biophysics,Chinese Academy of Sciences（CAS）until leaving...Dr.Xiyun Yan obtained her B.S.degree in 1983,from the Henan Medical College,and then studied cell biology in Professor Shizhang Bei’s lab in the Institute of Biophysics,Chinese Academy of Sciences（CAS）until leaving for Germany in 1989.After receiving her medical doctor＇s degree from Heidelberg University in Germany,she joined the Memorial Sloan-Kettering Institute in New York as a postdoctoral research fellow.In 1997,展开更多
文摘Problems of the current IGMP mechanism were identified, such as unnecessary periodic probing of hosts and leave latency, which wastes bandwidth and cause more traffic and overhead. Alternative mechanism that preserve the IP multicast model but employ join/leave messages to track local group membership for broadcast LANs (shared medium LANs) was proposed in this paper. We describe the implementation requirements of the new mechanism and compare it to existing one, demonstrating that join/leave approach is uniformly superior for the environment of broadcast LANs.
文摘基于稳定网的数据流连接算法已有很多研究成果,但在实际应用中,还需要处理不同速率网络下的查询连接,这使得目前流行的基于稳定数据流且内存分配固定环境下的连接算法难以适用。介绍了一种在非对称数据率网络下的无阻塞排序归并连接算法SMA。SMA算法的连接运算分为两阶段:join during run creation和join during merge,第一阶段可用于网络无阻塞情况下通过内存刷新策略来生成头批连接结果,第二阶段用于数据源受阻时借助外存驻留数据继续生成查询连接结果,从而保证了连接结果产生的无阻塞性。试验证明,SMA对等值和空间连接效率很高。
文摘Dr.Xiyun Yan obtained her B.S.degree in 1983,from the Henan Medical College,and then studied cell biology in Professor Shizhang Bei’s lab in the Institute of Biophysics,Chinese Academy of Sciences（CAS）until leaving for Germany in 1989.After receiving her medical doctor＇s degree from Heidelberg University in Germany,she joined the Memorial Sloan-Kettering Institute in New York as a postdoctoral research fellow.In 1997,
