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文章首先讨论了与光突发交换(OBS)相关的一些问题。接着讨论了OBS如何应用于下一代光互联网中,特别是偏置时间和延迟预留协议有助于避免使用光缓存,能在波分复用(WDM)层支持服务质量(QoS)服务。 相似文献
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针对线性令牌网络上不同优先权的消息延时不同,提出了一种自适应控制网络消息延时的算法。计算机模拟结果表明在网络负载为时变非对称的条件下,该算法可以自适应的调节各优先权的令牌循环时间,使线性令牌网络为各优先权提供公平的优先级服务。同时,还对控制算法中滑动时间窗口的选择进行了详细讨论。 相似文献
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本文首先论述了建设时间同步网的必要性,随后分析了本地交换网时间同步需求,介绍了S1240交换机外时间同步测试情况,讨论了交换机作为时间同步网网元层接入节点的技术要求,最后提出了加快时间同步网建设的建议。 相似文献
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本文对时间连续型非对称周期查询式完全服务排队系统进行了分析,并与时间离散型周期查询式完全服务排队系统(赵东风,1994)进行了对比研究。在两种系统取相同的系统参数值的条件下,给出两类排队服务系统的分析结果。 相似文献
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主要从两个方面来讨论如何提升客户对营业厅等侯时间的满意度,一是采取一些切实的措施,如简化业务流程、提高营业员的业务技能等,减少客户在营业厅的等候时间;二是控制客户期望、降低客户的心理预期,引导员提供贴身的服务等,提升客户在等侯过程中的感知从而提升客户的满意度,并就具体的措施作了较为详细的介绍。 相似文献
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数据业务时延是影响用户感知的主要因素.对影响数据业务时延的情况做了深入分析,并提出服务器、核心网、无线侧三个方面的优化策略.验证表明,采取上述优化策略后,数据业务时延指标提升效果明显,对数据业务优化有较好价值. 相似文献
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Aiming at the correlated and cascading failures caused by large-scale disasters,a post-disaster service restoration scheme was proposed.This scheme utilized global service bandwidth concession and the limited lifetime of local links to mitigate resource crunch in the post-disaster network.According to their bandwidth and holding time requirements,the impacted services for restoration was prioritized firstly,then jointly employed anycast and manycast routing strategies to improve the service connectivity and bandwidth resource utilization.Simulation results show that the proposed scheme can significantly reduce the service loss ratio,effectively prolong the holding time of the impacted services and decrease the data flow loss ratio in the post-disaster network. 相似文献
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Rerngvit Yanggratoke Jawwad Ahmed John Ardelius Christofer Flinta Andreas Johnsson Daniel Gillblad Rolf Stadler 《International Journal of Network Management》2018,28(2)
We predict performance metrics of cloud services using statistical learning, whereby the behaviour of a system is learned from observations. Specifically, we collect device and network statistics from a cloud testbed and apply regression methods to predict, in real‐time, client‐side service metrics for video streaming and key‐value store services. Results from intensive evaluation on our testbed indicate that our method accurately predicts service metrics in real time (mean absolute error below 16% for video frame rate and read latency, for instance). Further, our method is service agnostic in the sense that it takes as input operating systems and network statistics instead of service‐specific metrics. We show that feature set reduction significantly improves the prediction accuracy in our case, while simultaneously reducing model computation time. We find that the prediction accuracy decreases when, instead of a single service, both services run on the same testbed simultaneously or when the network quality on the path between the server cluster and the client deteriorates. Finally, we discuss the design and implementation of a real‐time analytics engine, which processes streams of device statistics and service metrics from testbed sensors and produces model predictions through online learning. 相似文献
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为了在靶场网络化测试模拟试验网中统一多台测试设备的本地时间,以便组织网络化多台设备组网综合数据融合模拟试验,需要设计时统专用标定设备。在分析了几种常用授时方式的基础上,提出了采用单脉冲硬件驱动定标机制来统一标定各测试设备的本地时间。此硬件设备以微控制器为控制核心,通过统一启动时间基准标定信号,来对各测试设备的主机本地时间进行统一标定。在试验中,数据融合系统能够在新的统一时间基准下工作,融合后的数据具有实时驱动其他测试设备的能力。试验结果表明此时间基准设备能够达到系统测试功能要求,可用作在靶场网络化综合测试模拟试验中对多台测试设备组网的时间的统一标定。 相似文献