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VLAN技术及其应用研究 总被引：4，自引：0，他引：4
马俊平 《武汉理工大学学报(交通科学与工程版)》2000,24(1):49-52
论证了ＶＬＡＮ技术特点和实现方式,以及基于ＡＴＭ骨干的ＶＬＡＮ实现方式,论述了基于交换机的端口,基于第三层协议的类型、基于多址广播方式和策略分组划分的四种ＶＬＡＮ的常用划分方式,以及通过外部路由器、具有路由功能的交换机和建立通信连接来实现ＶＬＡＮ的通信技术;简述了千兆以太网中ＶＬＡＮ的主式和服务质量的实现方式。 相似文献
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In the area of active traffic management, new technologies provide opportunities to improve the use of current infrastructure. Vehicles equipped with in-car communication systems are capable of exchanging messages with the infrastructure and other vehicles. This new capability offers many opportunities for traffic management. This paper presents a novel merging assistant strategy that exploits the communication capabilities of intelligent vehicles. The proposed control requires the cooperation of equipped vehicles on the main carriageway in order to create merging gaps for on-ramp vehicles released by a traffic light. The aim is to reduce disruptions to the traffic flow created by the merging vehicles. This paper focuses on the analytical formulation of the control algorithm, and the traffic flow theories used to define the strategy. The dynamics of the gap formation derived from theoretical considerations are validated using a microscopic simulation. The validation indicates that the control strategy mostly developed from macroscopic theory well approximates microscopic traffic behaviour. The results present encouraging capabilities of the system. The size and frequency of the gaps created on the main carriageway, and the space and time required for their creation are compatible with a real deployment of the system. Finally, we summarise the results of a previous study showing that the proposed merging strategy reduces the occurrence of congestion and the number of late-merging vehicles. This innovative control strategy shows the potential of using intelligent vehicles for facilitating the merging manoeuvre through use of emerging communications technologies. 相似文献
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隧道位移监测新方法的可行性探索 总被引：12，自引：1，他引：11
本文根据新奥法隧道施工中位移监测的特点,结合现代测量仪器的发展,探索了两种隧道位移监测的新方法：三维位移监测系统和隧道周边收敛的自由测站监测系统。其中,前者可以及时、快速、精确地在一个测站为多个监测断面提供可靠的三维变形量;后者可以大致在同一个测站上,以足够的精度为多个监测断面提供隧道周边收敛信息,其工效能比传统方法成倍提高。 相似文献
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ＩｎｔｒｏｄｕｃｔｉｏｎＡｓｙｎｃｈｒｏｎｏｕｓＴｒａｎｓｆｅｒＭｏｄｅｈａｓｂｅｅｎｇｉｖｅｎｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎａｓａｐｏｗｅｒｗａｙｏｆａｃｃｏｍ－ｐｌｉｓｈｉｎｇａｎｉｎｔｅｇｒａｔｅｄｓｅｒｖｉｃｅｎｅｔｗｏｒｋ［１］．ＩｎＡＴＭＮｅｔｗｏｒｋｓ,ｉｎｆｏｒｍａｔｉｏｎｉｓｄｉｖｉｄｅｄｉｎｔｏｓｈｏｒｔｆｉｘｅｄ－ｌｅｎｇｔｈｅｎｔｉｔｉｅｓ,ｃａｌｌｅｄｃｅｌｌｓ,ｗｈｉｃｈａｒｅｐｒｏｖｉｄｅｄｗｉｔｈｆｌｏｗｉｄｅｎｔｉｆｉｃａｔｉｏｎｌａｂｅｌｓ,ａｎｄ… 相似文献
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IntroductionIt is well known thatthe PNNIsystem is a de-veloping system in the private ATM networkfield[1～ 5] .According to Ref.[6],PNNI includestwo categories of protocols,one defines for dis-tributing topology information between switchesand clusters of switches- routing protocol,and theother defines the signalling- signalling protocol,which is message flows used to establish point topoint and point to multi- point connections acrossthe ATM network.Forrealizing the PNNIroutingwith m… 相似文献
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基于宽带网络物理设计要求，提出了高速公路联网通信系统ATM over SDH＋PON解决方案，然后对接入网与骨干网结构、容量、网管、保护和同步系统进行了设计。 相似文献