There exists large Leave latency (often on the order of several seconds)in current Internet group management mechanism. This will cause layered multicast congestion control in slow response to network congestion. We g...
详细信息
There exists large Leave latency (often on the order of several seconds)in current Internet group management mechanism. This will cause layered multicast congestion control in slow response to network congestion. We give a new concept of layer transfer,which can implement rapid congestion response in layered multicast. Layer transfer will move congested layer data from one group to another ,and the receivers will determine whether to re-subscribe the moved layer or not according to their current situations. Layer transfer has a key feature that it replaces slow Leave process by fast Join process ,so it doesn't require any change to IGMP protocol ,routers ,or other multicast routing protocol. The simulation results show the new method can improve layered multicast sessions' fairness towards TCP sessions.
以往的包装器主要针对仅含有一个数据块的Web页面，而对含有多个信息块的Web页面，简称MIB(Multiple Information Block), Web页面无法处理。该文提出了一个新的抽取规则，结合了基于文档结构的抽取规则和基于特征Pattern匹配的抽取规...
详细信息
以往的包装器主要针对仅含有一个数据块的Web页面，而对含有多个信息块的Web页面，简称MIB(Multiple Information Block), Web页面无法处理。该文提出了一个新的抽取规则，结合了基于文档结构的抽取规则和基于特征Pattern匹配的抽取规则的优点，能够有效地抽取MIB Web页面中的信息。
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