随着5G时代的到来,万物互联逐渐成为现实,然而,物联网中的很多终端因计算资源不足导致功能受限。移动边缘计算是一种新型网络计算模式,其终端设备可以将资源敏感型应用卸载到附近计算资源充足的边缘节点,从而降低运行成本/时延,提高服...随着5G时代的到来,万物互联逐渐成为现实,然而,物联网中的很多终端因计算资源不足导致功能受限。移动边缘计算是一种新型网络计算模式,其终端设备可以将资源敏感型应用卸载到附近计算资源充足的边缘节点,从而降低运行成本/时延,提高服务质量(QoS,quality of service)。针对移动边缘计算资源部署问题进行研究,考虑网络服务提供商(ISP,Internet service provider)支付部署资源的费用,同时向终端设备出租资源以获得收入的场景。由于物联网终端设备的资源需求是快速随机变化的,而边缘计算资源的部署是一个长期缓慢变化的过程,因此,合理的资源部署策略至关重要。提出了一个基于5G网络模型的分层网络结构,其中,计算资源可以部署在基站端、汇聚端以及云端等不同的网络层级。基于该分层网络架构,最优资源部署问题被构建为一个以ISP的利润最大化为优化目标的混合整数规划问题,并基于MATLAB中的CVX工具箱对该问题进行求解。仿真结果表明,所提出的移动边缘计算资源分层部署方案在ISP收入和部署成本方面的性能均优于平坦型资源部署方案。展开更多
[Objective] This study aimed to establish the multi-dimensional evaluation index system of agricultural water resources in Liaoning Province. [Method] Delphi method in conjunction with AHP method was adopted to establ...[Objective] This study aimed to establish the multi-dimensional evaluation index system of agricultural water resources in Liaoning Province. [Method] Delphi method in conjunction with AHP method was adopted to establish the multi-dimensional evaluation index system of agricultural water resources in Liaoning Province, and all the indexes in each hierarchy were ranked overall according to their weights. [Result] There were three hierarchies in this index system, totally including 21 indexes, among which water resource exploitation and utilization rate, sewage treatment rate and utilization of available water resources were the three crucial factors influencing the sustainable development. [Conclusion] This evaluation index system can reflect the true sustainable situation of the agricultural water resources in Liaoning Province.展开更多
A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy...A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy of Dynamic Joint Routing and Resource Allocation(DJRRA) and its algorithm description are also presented for the proposed layered network model. DJRRA op-timizes the bandwidth usage of interface links between different layers and the logic links inside all layers. The simulation results show that DJRRA can reduce the blocking probability and increase network throughput effectively,which is in contrast to the classical separate sequential routing and resource allocation solutions.展开更多
文摘随着5G时代的到来,万物互联逐渐成为现实,然而,物联网中的很多终端因计算资源不足导致功能受限。移动边缘计算是一种新型网络计算模式,其终端设备可以将资源敏感型应用卸载到附近计算资源充足的边缘节点,从而降低运行成本/时延,提高服务质量(QoS,quality of service)。针对移动边缘计算资源部署问题进行研究,考虑网络服务提供商(ISP,Internet service provider)支付部署资源的费用,同时向终端设备出租资源以获得收入的场景。由于物联网终端设备的资源需求是快速随机变化的,而边缘计算资源的部署是一个长期缓慢变化的过程,因此,合理的资源部署策略至关重要。提出了一个基于5G网络模型的分层网络结构,其中,计算资源可以部署在基站端、汇聚端以及云端等不同的网络层级。基于该分层网络架构,最优资源部署问题被构建为一个以ISP的利润最大化为优化目标的混合整数规划问题,并基于MATLAB中的CVX工具箱对该问题进行求解。仿真结果表明,所提出的移动边缘计算资源分层部署方案在ISP收入和部署成本方面的性能均优于平坦型资源部署方案。
文摘[Objective] This study aimed to establish the multi-dimensional evaluation index system of agricultural water resources in Liaoning Province. [Method] Delphi method in conjunction with AHP method was adopted to establish the multi-dimensional evaluation index system of agricultural water resources in Liaoning Province, and all the indexes in each hierarchy were ranked overall according to their weights. [Result] There were three hierarchies in this index system, totally including 21 indexes, among which water resource exploitation and utilization rate, sewage treatment rate and utilization of available water resources were the three crucial factors influencing the sustainable development. [Conclusion] This evaluation index system can reflect the true sustainable situation of the agricultural water resources in Liaoning Province.
基金the Science & Technology Foundation of Huawei Ltd. (No.YJCB2005040SW)the Creative Foundation of Xidian University (No.05030).
文摘A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy of Dynamic Joint Routing and Resource Allocation(DJRRA) and its algorithm description are also presented for the proposed layered network model. DJRRA op-timizes the bandwidth usage of interface links between different layers and the logic links inside all layers. The simulation results show that DJRRA can reduce the blocking probability and increase network throughput effectively,which is in contrast to the classical separate sequential routing and resource allocation solutions.
