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随着各主要城市数字电视平移完成,广电运营商将进入全面的视频和数据业务运营阶段,随着各种数据的积累,运营商的各种经营活动将逐步向精细化迈进,未来对各种信息数据的分析和挖掘将帮助运营商创造更多的价值,本文对重庆有线服务营销分析系统的建设进行了分析和探讨,对各种应用和技术进行介绍。 相似文献
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本文根据实践经验总结和分析了在有线数字电视前端系统中常见的各种故障和原因,介绍了各种故障分析定位的手段,并讨论了在进行故障应急处理和排除时应遵守的基本原则和各种办法,最后结合一些实际案例介绍故障的分析和排除。 相似文献
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在高清系统设计中除了要考虑各种信号的兼容性.还要考虑信号的传输距离和采用的传输线缆。在现今视频系统发展从模拟视频向数字视频过渡,从标清向高清过渡的时期中.各种视频源设备和各种视频显示设备采用了不同的编码技术和接口方式,因此在高清视频系统设计中必须详细了解各种视频信号的传输距离、编解码方式,否则视频信号将无法兼容和显示。 相似文献
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彩管行业中,使用的各种压力容器非常多,压力生产设备也不少。因此,压力容器的使用和维护,在我们的设备维护中占有相当重要的地位。我们的设备中,有各种压力储罐;有各种式样的热交换器;有压力反应釜;蒸发器、干燥设备;有各种高压、低压锅炉以及这些设备上使用的各种压力配 相似文献
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本文首先提出了软交换网中信令网关的应用场合,并对信令网关所用到的各种协议进行了详细的分析和比较,归纳出信令网关各种协议适用的组网模式,最后提供了信令网关在各种应用场景、各种设置方案情况下的协议选择建议. 相似文献
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针对Openstack的高可用性问题,目前大部分的研究都集中在控制节点的高可用上,对于虚拟机的高可用研究较少.已有的虚拟机高可用方案存在无法适应多种故障场景、无法针对单个虚拟机粒度进行故障处理等问题.本文提出了一种基于Openstack的虚拟机高可用方案,方案使用控制组件和代理服务组件,配合不同故障的检测逻辑,实现多种... 相似文献
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系统可用性是用来衡量装备效能的主要指标之一。在装备系统的使用过程中,系统可用性随着时间的变化而变化,其中备件供应策略对于系统可用性有着重要的影响。研究了系统的瞬时可用度随时间的变化情况,利用马尔科夫理论推导了瞬时可用度模型,并用仿真手段对数学进行了验证,可以为系统的可用性评估及研究备件的优化配置提供一种新思路。 相似文献
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《Reliability, IEEE Transactions on》2005,54(4):564-571
This paper explores the impact of imperfect repair on the availability of repairable equipment. Kijima's first virtual age model is used to describe the imperfect repair process. Due to the complexity of the underlying assumptions of this model, we are unable to derive a closed-form equation for availability. Therefore, simulation modeling & analysis are used to evaluate equipment availability. Based on initial availability plots, a generic availability function is proposed. A 2/sup 3/ factorial experiment is performed to evaluate the accuracy of this model. The maximum absolute error between the simulation output, and the corresponding values of the availability function is 3.82%. This indicates that our proposed function provides a reasonable approximation of equipment availability, which simplifies meaningful analysis for the unit. Therefore, a method is defined for determining optimum equipment replacement intervals based on average cost. Next, meta-models are developed to convert equipment reliability & maintainability parameters into the coefficients of the availability model. We expand on our initial experiment using a circumscribed central composite experimental design. We evaluate the accuracy of the meta-models for the 15 experiments & 50 random experiments within the design space. For the 50 new experiments, we compare the replacement policy obtained from analysis of the meta-model to the policy obtained directly from the simulation output. The average increase in cost resulting from the sub-optimal replacement policy is only 0.10%. Therefore, we conclude that the meta-models are robust, and provide good estimates of the parameters of our proposed availability function. By doing this, we eliminate the need to perform simulation to obtain the parameters of the availability model. 相似文献
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随着网络应用的不断普及,用户对网络的可靠性提出越来越高的要求。采用虚拟路由器冗余协议(VRRP)的优势在于不需要在终端进行动态路由和路由发现协议的配置,即可以获得一个高可靠性的缺省路由通道。介绍了VRRP的基本原理,结合在专网上进行的验证性试验,提出在该专网上应用VRRP进行IP业务可靠传输的方案。该方案提高了网络的稳定性和可靠性,节省了用户投资。 相似文献
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In optical Wavelength Division Multiplexing (WDM) networks, different protection schemes have been proposed in the literature,
namely, dedicated protection and shared protection. Shared protection techniques significantly reduce the required spare capacity
by providing the same level of availability as dedicated protection. However, current mission critical applications (which
heavily depend on the availability of communication resources) require connection availability in the order of 99.999% or
higher, which corresponds to a downtime of almost 5 min a year on the average. Therefore, in order to satisfy a connection
serviceavailability requirement defined by the users Service Level Agreement in a cost-effective and resource-efficient way,
network operators need a systematic mechanism to evaluate the network availability under multiple failure scenario to ensure
that current network configuration can meet the required availability degree; otherwise, a network upgrade is required. Unfortunately,
under multiple failure scenario, traditional availability analysis techniques based on reliability block diagrams are not
suitable for survivable networks with shared spare capacity. Therefore, a new concept is proposed to facilitate the calculations
of network availability. In this paper, we propose an analytical model for evaluating the availability of a WDM network with
shared-link connections under multiple link failures. The analytical model is also verified using Monte Carlo simulation.
The proposed model significantly contributes to the related areas by providing network operators with a quantitative tool
to evaluate the system availability and, thus, the expected survivability degree of WDM optical networks with shared connections
under multiple link failures. 相似文献
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This paper presents human error analysis of a (two units working and one on standby) system with arbitrarily distributed repair times. The supplementary vairables method is used to develop the system availability expressions. A general formula for the system steady-state availability is developed when the failed system repair times are gamma distributed. Time-dependent availability, system reliability with repair, mean time to failure and variance of time to failure formulae are developed for some particular cases. Selective plots are shown to demonstrate the impact of critical human error on system availability and reliability. 相似文献