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拓扑监视是网络态势感知系统的重要组成部分,拓扑监视的准确性与实时性是战场态势分析的前提,是指挥作战管理的必要手段。文章阐述了拓扑监视技术及其在网络态势感知系统中的重要性,并提出一种针对OPNET仿真网络的拓扑监视方法,通过采集仿真网络的拓扑信息,在仿真控制台上实时监视网络拓扑变化,供研究人员分析决策。 相似文献
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传感器网络中基于模拟退火算法的拓扑控制方案 总被引:5,自引:0,他引:5
为了研究符合网络生命期目标要求的传感器网络拓扑控制方案,针对传统方案所获拓扑的连通冗余度过高或结构健壮性较低等弊端,从理论上对拓扑需求进行了建模分析,最终转化模型为度约束最小生成树问题,并设计了一种模拟退火算法对该问题进行处理,进而提出了一种基于模拟退火算法的拓扑控制方案。通过实验对方案进行了性能分析和验证,结果表明该方案所获拓扑具有网络整体功耗低、结构健壮性高和节点间通信干扰可控的折衷特点,并能够有效地延长传感器网络生命期。 相似文献
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杭州电力调度SCADA系统实现对实时运行的电力系统进行数据采集、监视、控制和安全分析功能,是杭州电力调度最重要的系统。杭州配网SCADA系统基本目标是在市中心区域建立完善的配电自动化系统,实现配电SCADA、馈线自动化等功能,显著提高供电可靠性,并在调控一体化、智能配电网方面进行积极的探索和实践。本文主要分析配网SCADA系统的变电站10kV及以上实时数据通过调度SCADA系统通过网络方式转发获取方式,这些实事数据包括变电站设备信息、拓扑信息、实时信息及故障分析信息。并选择最佳方案。 相似文献
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利用低轨卫星对特定目标区域进行观测和监视在军民领域都具有很重大的意义,在系统设计中,需要重点考虎如何对所获取的信息进行实时传输并高效处理.介绍了一种准实时目标区域监视星座应用模式,进行了理论分析,并以仿真说明了该模式下监视信息的传输具有较高的时效性,优于传统的星座应用模式.最后分析了该应用模式下涉及到的多星接入问题. 相似文献
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提出一种无线体域网(WBAN, wireless body area network)的网络拓扑结构设计方案。该方案针对IEEE 802.15.6标准的2跳扩展星型拓扑结构,建立基于混合整数非线性规划的能耗成本优化模型,通过调整中继节点的位置和数量,以及数据到汇聚节点的路由,获得优化的网络拓扑结构。实验结果分析表明,与Elias提出的EAWD(energy aware WBAN design) 模型相比,所提出的方案能使网络能耗减少40.5%,网络时延平均降低52.4%,网络寿命提高了一倍。 相似文献
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基于分层自治域空间信息网络模型与拓扑控制算法 总被引:1,自引:0,他引:1
针对空间信息网络结构复杂、拓扑动态变化以及空间尺度大等特点,提出一种面向空间信息网的分层自治域模型。该模型根据节点属性、链路能力、任务特点、分布区域等不同,将整个网络划分为不同的自治域和子自治域,各域内可采用相对独立的控制策略,从而将子网间各动态因素解耦合。然后,基于该分层自治域模型,提出了一种最小化时延的拓扑控制算法。与现有的集中式和分布式拓扑控制方法不同,该算法采用混合式方法,将控制信息约束在相邻子自治域范围内,既保证了网络的连通性,又减少了控制信息的开销。理论分析表明,若网络的物理拓扑是k连通的,则该算法得到的拓扑控制结果一定是k连通的。仿真结果验证了理论分析和所提出算法的有效性。 相似文献
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下一代网络业务提供是一个分布式系统,在支持通信类增值业务时要求一定的QoS保证。实时CORBA采用面向对象的方法,提高了分布式应用软件的可重用性和可扩展性,大大简化了分布式应用系统的开发和维护,便于异构环境下的系统集成;而且为分布实时应用提供端到端的可预测性。结合实时CORBA规范及其产品中的实现技术,讨论了实时CORBA的资源控制策略及其实现的协议框架,并用试验分析验证它的实时性能。实时CORBA改善了通用CORBA的实时性能,能够为下一代网络业务提供一定的实时保证。 相似文献
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Object-oriented distributed real-time applications require enforcement of end-to-end timing constraints on service requests from clients to servers. Thus, timing aspects should be integrated and handled by CORBA which is a standard to support distributed object-oriented applications. In spite of the release of real-time CORBA (RT-CORBA) specification, a few vendors have ported their ORBs (Object Request Brokers) to real-time operating systems. In this paper we analyze existing RT-CORBA implementations, and we propose a framework that integrates the main components (scheduling, real-time communication, end-to-end quality of service providing, etc.) necessary for implementation of RT-CORBA to support static and dynamic real-time applications. 相似文献
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Applying a 3-D-GUI to a distributed network management system 总被引:6,自引:0,他引:6
Watanabe N. Igarashi Y. Hanaki M. 《Selected Areas in Communications, IEEE Journal on》2000,18(5):715-722
Three-dimensional (3-D) GUIs help network operators to understand complicated network configurations. With the goal of applying 3-D-GUI technology to CORBA-based network management systems, this paper proposes a method of integrating VRML/Java/CORBA, in which Java applets mediate management information between a VRML scene and a CORBA server. A prototype system configuration that incorporates this method and its operation sequence, which displays the fault notifications on VRML scenes, is described. An evaluation of the prototype system demonstrates the effectiveness of this method 相似文献
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首先简要介绍基于资源预留的集成服务模型(IntServ/RSVP)、以及CORBA A/V Stream规范中的QoS相关概念。在此基础上给出一个集成QoS模型,论述CORBA A/V Stream QoS与IntServ/RSVP之间的映射模型及绑定策略。 相似文献
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Techniques for enhancing real-time CORBA quality of service 总被引:5,自引:0,他引:5
Pyarali I. Schmidt D.C. Cytron R.K. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2003,91(7):1070-1085
End-to-end predictability of remote operations is essential for many fixed-priority distributed real-time and embedded (DRE) applications, such as command and control systems, manufacturing process control systems, large-scale distributed interactive simulations, and testbeam data acquisition systems. To enhance predictability, the Real-time CORBA specification defines standard middleware features that allow applications to allocate, schedule, and control key CPU, memory, and networking resources necessary to ensure end-to-end quality of service support. This paper provides two contributions to the study of Real-time CORBA middleware for DRE applications. First, we identify potential problems with ensuring predictable behavior in conventional middleware by examining the end-to-end critical code path of a remote invocation and identifying sources of unbounded priority inversions. Experimental results then illustrate how the problems we identify can yield unpredictable behavior in conventional middleware platforms. Second, we present design techniques for ensuring real-time quality of service in middleware. We show how middleware can be redesigned to use nonmultiplexed resources to eliminate sources of unbounded priority inversion. The empirical results in this paper are conducted using TAO, which is widely used and open-source DRE middleware compliant with the Real-time CORBA specification. 相似文献
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Communication software and distributed services for next-generation applications must be reliable, efficient, flexible, and reusable. These requirements motivate the use of the Common Object Request Broker Architecture (CORBA). However, building highly available applications with CORBA is hard. Neither the CORBA standard nor conventional implementations of CORBA directly address complex problems related to distributed computing, such as real-time or high-speed quality of service, partial failures, group communication, and causal ordering of events. This article describes a CORBA-based framework that uses the virtual synchrony model to support reliable data- and process-oriented distributed systems that communicate through synchronous methods and asynchronous messaging 相似文献
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A. I. Lyakhov P. O. Nekrasov D. M. Ostrovsky A. A. Safonov E. M. Khorov 《Journal of Communications Technology and Electronics》2012,57(12):1322-1330
A number of routing protocols for wireless ad-hoc (self-organizing) networks selects routes according to the topology information obtained by the station. Hence, the method of these protocols used to disseminate topology information strongly affects the network performance. An unsuccessful choice of the method can lead to a large amount of traffic and the information obsolescence. These factors diminish the network performance and make it impossible to meet quality of service requirements in transmitting realtime multimedia data, which is a topical problem. The routing protocol combining the proactive and reactive methods of the topology information dissemination has been proposed. It is demonstrated that this protocol is efficient in a wide range of scenarios applied to the exchange of real-time multimedia data. 相似文献