RIP(RoutingInformationProtocol,路由信息协议)是一种内部网关协议(IGP)[1],用于在较小的网络中传递路由信息,在这些网络中,距离测量使用跳数(即经过的路由器数)。RIP(Routing Information Protocol)路由协议是一种基于距离向量算法的...RIP(RoutingInformationProtocol,路由信息协议)是一种内部网关协议(IGP)[1],用于在较小的网络中传递路由信息,在这些网络中,距离测量使用跳数(即经过的路由器数)。RIP(Routing Information Protocol)路由协议是一种基于距离向量算法的路由协议,在网络中选择最优路径[2]。RIP协议通过发送和接收路由信息来确定最佳路径,它使用距离向量算法,同时每个路由器都维护一个路由表,表中存储从此路由器到其他路由器的距离。该文阐述了RIP协议的防环机制,主要包括水平分割、毒性逆转和触发更新机制。这些机制可使协议更加准确地找到最佳路径,并降低网络环路的产生风险,从而提高协议的性能、可靠性和稳定性。通过分析和比较这些机制,可以更好地了解和利用RIP协议,使其在网络中发挥更加重要的作用。展开更多
The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induc...The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induced currents in the Haller experiment and the ideal arc-shaped coast similar to Sanya Dadonghai, Hainan Province,China. The results showed that the FUNWAVE model has considerable ability to simulate the rip currents, and it was used to further simulate rip currents off arc-shaped coastlines to investigate their characteristics. The rip currents were found to be stronger as the curvature of arc-shaped coastline increased. Coastal beach slope exerts a significant influence on rip currents; in particular, an overly steep or overly mild slope is not conducive to creating rip currents. Furthermore, the rip currents were found to become weaker as the size of arc-shaped coast decreased. When the height and period of waves increase, the strength of rip currents also increases, and, in some cases, wave heights of 0.4 m may produce dangerous rip currents.展开更多
文摘RIP(RoutingInformationProtocol,路由信息协议)是一种内部网关协议(IGP)[1],用于在较小的网络中传递路由信息,在这些网络中,距离测量使用跳数(即经过的路由器数)。RIP(Routing Information Protocol)路由协议是一种基于距离向量算法的路由协议,在网络中选择最优路径[2]。RIP协议通过发送和接收路由信息来确定最佳路径,它使用距离向量算法,同时每个路由器都维护一个路由表,表中存储从此路由器到其他路由器的距离。该文阐述了RIP协议的防环机制,主要包括水平分割、毒性逆转和触发更新机制。这些机制可使协议更加准确地找到最佳路径,并降低网络环路的产生风险,从而提高协议的性能、可靠性和稳定性。通过分析和比较这些机制,可以更好地了解和利用RIP协议,使其在网络中发挥更加重要的作用。
基金The National Natural Science Foundation under contract Nos 41206163,41076048 and 41376012the Operation Expenses for Universities'Basic Scientific Research of Central Authorities under contract Nos 2011B05714 and 2014B06514
文摘The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induced currents in the Haller experiment and the ideal arc-shaped coast similar to Sanya Dadonghai, Hainan Province,China. The results showed that the FUNWAVE model has considerable ability to simulate the rip currents, and it was used to further simulate rip currents off arc-shaped coastlines to investigate their characteristics. The rip currents were found to be stronger as the curvature of arc-shaped coastline increased. Coastal beach slope exerts a significant influence on rip currents; in particular, an overly steep or overly mild slope is not conducive to creating rip currents. Furthermore, the rip currents were found to become weaker as the size of arc-shaped coast decreased. When the height and period of waves increase, the strength of rip currents also increases, and, in some cases, wave heights of 0.4 m may produce dangerous rip currents.
