Bush type fractal functions were defined by means of the expression of Cantor series of real numbers. The upper and lower bound estimates for the K-dimension of such functions were given. In a typical case, the fracta...Bush type fractal functions were defined by means of the expression of Cantor series of real numbers. The upper and lower bound estimates for the K-dimension of such functions were given. In a typical case, the fractal dimensional relations in which the K-dimension equals the box dimension and packing dimension were presented; moreover, the exact Holder exponent were obtained for such Bush type functions.展开更多
基于Fat-tree拓扑的数据中心网络中存在一系列保证通信可靠性的富连接。这些富连接导致网络低负载情况下有大量设备处于空闲状态,而传统网络无法在保证网络可靠性的同时对设备进行调度。为解决该问题,设计ESPP:基于软件定义网络SDN(Soft...基于Fat-tree拓扑的数据中心网络中存在一系列保证通信可靠性的富连接。这些富连接导致网络低负载情况下有大量设备处于空闲状态,而传统网络无法在保证网络可靠性的同时对设备进行调度。为解决该问题,设计ESPP:基于软件定义网络SDN(Software Defined Network)的节能路径规划系统。客户端通过控制器收集网络信息,计算节能路径,调节数据流向,调度物理设备。在Mininet搭建的模拟网络环境中进行测试的结果表明,该系统能够实时计算节能路径,下发节能策略,有效降低能量消耗,实现数据中心网络的绿色节能。展开更多
Virtualization is a common technology for resource sharing in data center. To make efficient use of data center resources, the key challenge is to map customer demands （modeled as virtual data center, VDC） to the ph...Virtualization is a common technology for resource sharing in data center. To make efficient use of data center resources, the key challenge is to map customer demands （modeled as virtual data center, VDC） to the physical data center effectively. In this paper, we focus on this problem. Distinct with previous works, our study of VDC embedding problem is under the assumption that switch resource is the bottleneck of data center networks （DCNs）. To this end, we not only propose relative cost to evaluate embedding strategy, decouple embedding problem into VM placement with marginal resource assignment and virtual link mapping with decided source-destination based on the property of fat-tree, but also design the traffic aware embedding algorithm （TAE） and first fit virtual link mapping （FFLM） to map virtual data center requests to a physical data center. Simulation results show that TAE＋FFLM could increase acceptance rate and reduce network cost （about 49% in the case） at the same time. The traffie aware embedding algorithm reduces the load of core-link traffic and brings the optimization opportunity for data center network energy conservation.展开更多
基金The National Natural Science Foundation of China (No.10171080)
文摘Bush type fractal functions were defined by means of the expression of Cantor series of real numbers. The upper and lower bound estimates for the K-dimension of such functions were given. In a typical case, the fractal dimensional relations in which the K-dimension equals the box dimension and packing dimension were presented; moreover, the exact Holder exponent were obtained for such Bush type functions.
文摘基于Fat-tree拓扑的数据中心网络中存在一系列保证通信可靠性的富连接。这些富连接导致网络低负载情况下有大量设备处于空闲状态,而传统网络无法在保证网络可靠性的同时对设备进行调度。为解决该问题,设计ESPP:基于软件定义网络SDN(Software Defined Network)的节能路径规划系统。客户端通过控制器收集网络信息,计算节能路径,调节数据流向,调度物理设备。在Mininet搭建的模拟网络环境中进行测试的结果表明,该系统能够实时计算节能路径,下发节能策略,有效降低能量消耗,实现数据中心网络的绿色节能。
基金This research was partially supported by the National Grand Fundamental Research 973 Program of China under Grant （No. 2013CB329103）, Natural Science Foundation of China grant （No. 61271171）, the Fundamental Research Funds for the Central Universities （ZYGX2013J002, ZYGX2012J004, ZYGX2010J002, ZYGX2010J009）, Guangdong Science and Technology Project （2012B090500003, 2012B091000163, 2012556031）.
文摘Virtualization is a common technology for resource sharing in data center. To make efficient use of data center resources, the key challenge is to map customer demands （modeled as virtual data center, VDC） to the physical data center effectively. In this paper, we focus on this problem. Distinct with previous works, our study of VDC embedding problem is under the assumption that switch resource is the bottleneck of data center networks （DCNs）. To this end, we not only propose relative cost to evaluate embedding strategy, decouple embedding problem into VM placement with marginal resource assignment and virtual link mapping with decided source-destination based on the property of fat-tree, but also design the traffic aware embedding algorithm （TAE） and first fit virtual link mapping （FFLM） to map virtual data center requests to a physical data center. Simulation results show that TAE＋FFLM could increase acceptance rate and reduce network cost （about 49% in the case） at the same time. The traffie aware embedding algorithm reduces the load of core-link traffic and brings the optimization opportunity for data center network energy conservation.
