针对传统的非足部基于人员轨迹盲推的室内定位(Pedestrian Dead Reckoning,PDR)方法仅适合单个行为条件下的定位,无法适应真实定位场景的问题,提出了一种基于深度行为分类的人员轨迹盲推方法。该方法首先利用基于循环神经网络(Recurrent...针对传统的非足部基于人员轨迹盲推的室内定位(Pedestrian Dead Reckoning,PDR)方法仅适合单个行为条件下的定位,无法适应真实定位场景的问题,提出了一种基于深度行为分类的人员轨迹盲推方法。该方法首先利用基于循环神经网络(Recurrent Neural Network,RNN)的深度学习进行人员行为分类,并且根据分类结果(手持条件下、口袋中、自由晃动)设计不同的模型进行迈步检测、步长估计和航向估计,从而对人员的位置进行估计。实测实验验证了所提方法的有效性,其行为识别的准确率达到98%,并且相比于两种传统的单一行为定位方法,定位精度分别提高了1.7 m和2.3 m。展开更多
针对高效率视频编码(High Efficiency Video Coding,HEVC)在编码过程中的帧层比特分配未考虑视频内容特性与缓冲区的状态而导致帧层比特分配不合理及编码性能低等问题,本文提出一种基于R-λ模型的帧层码率控制优化算法。首先,通过计算...针对高效率视频编码(High Efficiency Video Coding,HEVC)在编码过程中的帧层比特分配未考虑视频内容特性与缓冲区的状态而导致帧层比特分配不合理及编码性能低等问题,本文提出一种基于R-λ模型的帧层码率控制优化算法。首先,通过计算得到一种度量帧层图像复杂度的综合因子,并作为新帧层比特分配权重;其次,根据目标缓冲级与缓冲区剩余比特计算出缓冲区反馈比特;最后,根据计算获得的新帧层比特分配权重和缓冲区反馈比特对帧层进行比特分配。本文算法在HM16.0上进行了实现和性能测试,结果表明,与HEVC原始的码率控制算法相比,优化算法的码率控制误差平均下降了2.008%,峰值信噪比平均提高了0.21dB。展开更多
The rapid industrial development calls for alloys that possess higher comprehensive properties. In this study, the effect of microalloying La addition on the precipitation behavior during artificial aging as well as t...The rapid industrial development calls for alloys that possess higher comprehensive properties. In this study, the effect of microalloying La addition on the precipitation behavior during artificial aging as well as the mechanical properties and electrical conductivity of Al-Mg-Si alloys were investigated by thermal analysis, microstructural characterizations and properties tests.The results demonstrated that micro-alloying La addition does not change the whole precipitation sequence during the artificial aging of Al-Mg-Si alloys as well as the atomic structure of the precipitates. However, the higher La-vacancy binding energy as well as the strong La-Si and La-Mg interactions can decrease the solubility of Si and Mg in the Al matrix and the β″ precipitation activation energy from 89.9 to 76.7 kJ/mol, leading to the improvement of the strength and electrical conductivity of Al-Mg-Si alloys simultaneously. The microstructural features affecting the strength and electrical conductivity were theoretically discussed in terms of the La addition.展开更多
文摘针对高效率视频编码(High Efficiency Video Coding,HEVC)在编码过程中的帧层比特分配未考虑视频内容特性与缓冲区的状态而导致帧层比特分配不合理及编码性能低等问题,本文提出一种基于R-λ模型的帧层码率控制优化算法。首先,通过计算得到一种度量帧层图像复杂度的综合因子,并作为新帧层比特分配权重;其次,根据目标缓冲级与缓冲区剩余比特计算出缓冲区反馈比特;最后,根据计算获得的新帧层比特分配权重和缓冲区反馈比特对帧层进行比特分配。本文算法在HM16.0上进行了实现和性能测试,结果表明,与HEVC原始的码率控制算法相比,优化算法的码率控制误差平均下降了2.008%,峰值信噪比平均提高了0.21dB。
基金This work was supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China(Grant No.5500-201924129A-0-0-00)。
文摘The rapid industrial development calls for alloys that possess higher comprehensive properties. In this study, the effect of microalloying La addition on the precipitation behavior during artificial aging as well as the mechanical properties and electrical conductivity of Al-Mg-Si alloys were investigated by thermal analysis, microstructural characterizations and properties tests.The results demonstrated that micro-alloying La addition does not change the whole precipitation sequence during the artificial aging of Al-Mg-Si alloys as well as the atomic structure of the precipitates. However, the higher La-vacancy binding energy as well as the strong La-Si and La-Mg interactions can decrease the solubility of Si and Mg in the Al matrix and the β″ precipitation activation energy from 89.9 to 76.7 kJ/mol, leading to the improvement of the strength and electrical conductivity of Al-Mg-Si alloys simultaneously. The microstructural features affecting the strength and electrical conductivity were theoretically discussed in terms of the La addition.
