To improve the resource utilization ratio and shorten the recovery time of the shared path protection with differentiated reliability （SPP-DiR） algorithm, an algorithm called dynamic shared segment protection with d...To improve the resource utilization ratio and shorten the recovery time of the shared path protection with differentiated reliability （SPP-DiR） algorithm, an algorithm called dynamic shared segment protection with differentiated reliability （DSSP-DiR） is proposed for survivable GMPLS networks. In the proposed algorithm, a primary path is dynamically divided into several segments according to the differentiated reliability requirements of the customers. In the SPP-DiR algorithm, the whole primary path should be protected, while in the DSSP- DiR algorithm, only partial segments on the primary path need to be protected, which can reduce more backup bandwidths than that in the SPP-DiR algorithm. Simulation results show that the DSSP-DiR algorithm achieves higher resource utilization ratio, lower protection failure probability, and shorter recovery time than the SPP-DiR algorithm.展开更多
Presently, more and more attention is paid to cultural landscapes by peo-ple at travel ing, especial y for folk culture in ethnic minority regions where rich hu-man landscapes could be ful y made use of to improve lan...Presently, more and more attention is paid to cultural landscapes by peo-ple at travel ing, especial y for folk culture in ethnic minority regions where rich hu-man landscapes could be ful y made use of to improve landscape quality. In the research, cultural landscapes in Zhangjiajie National Forest Park were surveyed and evaluated to analyze characters of cultural utilization, as wel as problems existing in the Park. In addition, highlights were given to protection on cultural landscapes in a forest park construction, presentation of ethnic minority culture, and ful development of tourism products.展开更多
为了解决虚拟网络映射光路太长和频谱碎片化的问题,论文提出一种基于邻居链路碎片感知的虚拟网络映射算法(Virtual Optical Network Embedding based on Adjacency Link Fragmentation Awareness, ALFA-VONE).设计考虑虚拟节点资源需求...为了解决虚拟网络映射光路太长和频谱碎片化的问题,论文提出一种基于邻居链路碎片感知的虚拟网络映射算法(Virtual Optical Network Embedding based on Adjacency Link Fragmentation Awareness, ALFA-VONE).设计考虑虚拟节点资源需求和邻居节点映射状态的权值计算方法,提高虚拟节点映射的成功率;使用相邻虚拟节点-虚拟链路协同映射方法,缩短映射光路长度和减少所需频隙数目;设计光路可用资源评估方法,以提高虚拟链路映射成功率;考虑拟分配频谱块对光路以及邻居链路造成的频谱碎片影响,设计频谱碎片影响值评估法,以提高频谱资源利用率.仿真结果表明:当网络负载为130 Erlang时,所设计算法的平均映射光路跳数减少28.4%,带宽利用率提高4.56%.展开更多
基金supported by the National Natural Science Foundation of China (60673142)Applied Basic Research Project of Sichuan Province (2006J13-067)
文摘To improve the resource utilization ratio and shorten the recovery time of the shared path protection with differentiated reliability （SPP-DiR） algorithm, an algorithm called dynamic shared segment protection with differentiated reliability （DSSP-DiR） is proposed for survivable GMPLS networks. In the proposed algorithm, a primary path is dynamically divided into several segments according to the differentiated reliability requirements of the customers. In the SPP-DiR algorithm, the whole primary path should be protected, while in the DSSP- DiR algorithm, only partial segments on the primary path need to be protected, which can reduce more backup bandwidths than that in the SPP-DiR algorithm. Simulation results show that the DSSP-DiR algorithm achieves higher resource utilization ratio, lower protection failure probability, and shorter recovery time than the SPP-DiR algorithm.
基金Supported by Research Foundation of Education Bureau of Hunan Province(09AC073)~~
文摘Presently, more and more attention is paid to cultural landscapes by peo-ple at travel ing, especial y for folk culture in ethnic minority regions where rich hu-man landscapes could be ful y made use of to improve landscape quality. In the research, cultural landscapes in Zhangjiajie National Forest Park were surveyed and evaluated to analyze characters of cultural utilization, as wel as problems existing in the Park. In addition, highlights were given to protection on cultural landscapes in a forest park construction, presentation of ethnic minority culture, and ful development of tourism products.
文摘为了解决虚拟网络映射光路太长和频谱碎片化的问题,论文提出一种基于邻居链路碎片感知的虚拟网络映射算法(Virtual Optical Network Embedding based on Adjacency Link Fragmentation Awareness, ALFA-VONE).设计考虑虚拟节点资源需求和邻居节点映射状态的权值计算方法,提高虚拟节点映射的成功率;使用相邻虚拟节点-虚拟链路协同映射方法,缩短映射光路长度和减少所需频隙数目;设计光路可用资源评估方法,以提高虚拟链路映射成功率;考虑拟分配频谱块对光路以及邻居链路造成的频谱碎片影响,设计频谱碎片影响值评估法,以提高频谱资源利用率.仿真结果表明:当网络负载为130 Erlang时,所设计算法的平均映射光路跳数减少28.4%,带宽利用率提高4.56%.
