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提出了一种基于优先级的偏射路由机制,该机制通过分割偏射优先级低的突发包来保证高优先级突发包的QoS.仿真结果表明,高优先级突发包的丢失率比低优先级的要低,并且突发包的丢失率随数据信道数目的增加而降低.该机制不仅能够有效地降低突发包的丢失率,而且能够为高优先级突发包提供很好的QoS保障. 相似文献
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光突发交换网络基于优先级与突发包分割的光缓存方法 总被引:1,自引:1,他引:1
为了保证光突发交换(OBS)网络中不同优先级业务的服务质量(Qos)和有效地降低突发包的丢失率,提出了一种基于优先级与突发包分割的光缓存方法.该方法通过在输出数据信道上设置光纤延迟线组来缓存被分割的冲突突发包.当冲突发生时,基于突发包的优先级进行"竞争突发包头部分割或者原突发包尾部分割,,处理;无冲突部分进行交换或者直... 相似文献
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One of the key problems to hinder the realization of optical burst switching(OBS) technology in the core networks is the losses due to the contention among the bursts at the core nodes.Burst segmentation is an effective contention resolution technique used to reduce the number of packets lost due to the burst losses.In our work,a burst segmentation-deflection routing contention resolution mechanism in OBS networks is proposed.When the contention occurs,the bursts are segmented according to the lowest packet loss probability of networks firstly,and then the segmented burst is deflected on the optimum routing.An analytical model is proposed to evaluate the contention resolution mechanism.Simulation results show that high-priority bursts have significantly lower packet loss probability and transmission delay than the low-priority.And the performance of the burst lengths,in which the number of segments per burst distributes geometrically,is more effective than that of the deterministically distributed burst lengths. 相似文献
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OBS网络中基于优先级的先分割后缓存冲突解决方法 总被引:2,自引:2,他引:2
为了有效地降低突发包的丢失率和保证OBS网络中不同优先级业务的服务质量,提出了一种基于优先级的先分割后缓存冲突解决方法。该方法通过在多波长信道系统的输出数据信道上设置光纤延迟线组来缓存被分割的冲突突发包。当冲突发生时,首先基于突发包的优先级和处理完毕时间进行"竞争突发包头部分割或者原突发包尾部分割"处理;无冲突部分进行交换或者直接在事先预留的输出数据信道上处理,冲突部分的分割突发包进行光缓存。仿真结果表明,多波长信道系统中,高优先级突发包的丢失率低于低优先级突发包的丢失率。同时该方法在一定程度上可以有效地减少端到端的传输时延和整个网络的丢包率,从而提高整个OBS网络的性能。 相似文献
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In this paper, we developed a portable laser-induced breakdown spectroscopy(LIBS) using an optical fiber to deliver laser energy and used it to quantitatively analyze minor elements in steel.The R~2 factors of calibration curves of elements Mn, Ti, V, and Cr in pig iron were 0.9965,0.9983, 0.9963, and 0.991, respectively, and their root mean square errors of cross-validation were 0.0501, 0.0054, 0.0205, and 0.0245 wt%, respectively. Six test samples were used for the validation of the performance of the calibration curves established by the portable LIBS. The average relative errors of elements Mn, Ti, V, and Cr were 2.5%, 11.7%, 13.0%, and 5.6%,respectively. These results were comparable with most results reported in traditional LIBS in steel or other matrices. However, the portable LIBS is flexible, compact, and robust, providing a promising prospect in industrial application. 相似文献
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OBS网络中冲突解决方法研究 总被引:3,自引:1,他引:3
在OBS网络中,当两个或多个突发包要求在同一时刻,同一输出端口的同一波长上预留资源时.就会产生突发数据包的资源竞争。如何解决资源竞争问题是OBS技术能否最终走向实际应用的关键技术之一。文章首先介绍OBS的基本原理、网络结构、OBS网络的资源预约机制、边缘路由器的封装机制和资源调度机制,接着研究解决OBS网络中突发数据包之间争夺链路资源问题的竞争解决机制,随后详细的给出四种竞争解决方案:光缓存、波长转换、偏射路由和突发分段丢弃,并分析了它们的性能。在此基础上,文章最后提出了各种资源竞争解决方案相结合的联合解决机制的思想。 相似文献
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