在基于移动边缘计算(mobile edge computing,MEC)的第5代移动通信网络(5th generation mobile communication network,5G)中,针对无线虚拟现实(virtual reality,VR)用户在小小区间频繁切换而降低业务体验质量(quality of experience,QoE...在基于移动边缘计算(mobile edge computing,MEC)的第5代移动通信网络(5th generation mobile communication network,5G)中,针对无线虚拟现实(virtual reality,VR)用户在小小区间频繁切换而降低业务体验质量(quality of experience,QoE)的问题。考虑建立多视角3维(3-dimensional,3D)视频的主动缓存、计算和通信(caching,computing and communication,3C)资源分配数学模型,并采用深度强化学习(deep reinforcement learning,DRL)算法进行求解。将多视角3D视频的主动资源分配系统建模为联合视角选择和小基站3C资源分配的马尔科夫决策过程(Markov decision process,MDP),提出了一种基于深度确定性策略梯度(deep deterministic policy gradient,DDPG)算法来寻找有效解。仿真结果表明,与另外2种算法相比,所提算法可以为无线VR用户在小小区间移动时提供更好的业务体验。展开更多
M23C6 chromium-rich carbides are common grain-boundary precipitations in Cr-containing steel.The presence of grain-boundary carbides often leads to intergranular brittleness and decreases mechanical properties.This st...M23C6 chromium-rich carbides are common grain-boundary precipitations in Cr-containing steel.The presence of grain-boundary carbides often leads to intergranular brittleness and decreases mechanical properties.This study proposes a deformation and aging technique to obtain a high-volume-fraction dispersion distribution of the hard nano-M23C6 phase by changing the nucleation sites from grain boundaries to deformation coherent twin boundaries produced during cold deformation.The M23C6 precipitation-strengthened austenitic stainless steel has a strength of up to 1.4 GPa but maintains favorable plasticity(>11%).This study provides a novel approach for the control of intergranular brittleness in metallic materials.展开更多
文摘在基于移动边缘计算(mobile edge computing,MEC)的第5代移动通信网络(5th generation mobile communication network,5G)中,针对无线虚拟现实(virtual reality,VR)用户在小小区间频繁切换而降低业务体验质量(quality of experience,QoE)的问题。考虑建立多视角3维(3-dimensional,3D)视频的主动缓存、计算和通信(caching,computing and communication,3C)资源分配数学模型,并采用深度强化学习(deep reinforcement learning,DRL)算法进行求解。将多视角3D视频的主动资源分配系统建模为联合视角选择和小基站3C资源分配的马尔科夫决策过程(Markov decision process,MDP),提出了一种基于深度确定性策略梯度(deep deterministic policy gradient,DDPG)算法来寻找有效解。仿真结果表明,与另外2种算法相比,所提算法可以为无线VR用户在小小区间移动时提供更好的业务体验。
基金supported by the National Natural Science Foundation of China(No.52250130).
文摘M23C6 chromium-rich carbides are common grain-boundary precipitations in Cr-containing steel.The presence of grain-boundary carbides often leads to intergranular brittleness and decreases mechanical properties.This study proposes a deformation and aging technique to obtain a high-volume-fraction dispersion distribution of the hard nano-M23C6 phase by changing the nucleation sites from grain boundaries to deformation coherent twin boundaries produced during cold deformation.The M23C6 precipitation-strengthened austenitic stainless steel has a strength of up to 1.4 GPa but maintains favorable plasticity(>11%).This study provides a novel approach for the control of intergranular brittleness in metallic materials.
