A topology and application‐aware relay path allocation scheme in multipath transport system based on application‐level relay

The ever‐increasing transmission requirements of quality of service (QoS)‐sensitive applications, especially real‐time multimedia applications, can hardly be met by the single path routing protocols. Multipath transmission mechanism is a feasible approach to provide QoS for various applications. On the basis of the general framework of multipath transport system based on application‐level relay, we present a relay path allocation scheme, whose goal is to select suitable relay paths, while balancing the overlay traffic among the different domains and relayers. With the application‐layer traffic optimization service under the standardization within the Internet Engineering Task Force (IETF), the controller has the topology‐aware ability to allocate relay paths with excellent routing performance. To further develop the universality of our method, the controller perceives transmission performance of relay overlay network through relayers' performance detection processes and, thus, has the application‐aware ability to allocate relay paths with excellent transmission performance for different applications by consulting application‐specific transmission metrics. Simulation results demonstrate that the proposed relay path allocation algorithm performs well in allocating superior relay paths and can balance the distribution of overlay traffic across domains in different network situations.     

QCJ7081型奥拓轿车二维不可压缩流场数值分析

采用边界压力单向条件的流函数－旋度方程,对QCJ7081新型奥拓轿车贴近地面平行移动的二维不可压缩流场进行了数值分析,随时间变化的发展方程采用Runge-Kutta-Gill法求数值解,在空间上离散的Poisson差分方程采用超松驰迭代法求解。计算结果符合流体力学规律并与实验结果有较好的一致性。     

基于SDN的应用层流量优化研究

SDN符合未来网络硬件标准化、设备软件化的特征,颠覆了现有的网络架构,其应用、控制、转发相分离的架构设计为网络创新带来了新的活力。本文分析现有应用层流量优化技术ALTO及其与SDN架构融合的优势和可行性,提出基于SDN的ALT0协议优化需求。