针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立...针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立了人体通信模型,仿真结果与等效电路分析方法计算的信道增益差距小于1 d B。仿真分析表明:该分析方法能够准确地描述可穿戴设备中人体通信信道的特性,完善了可穿戴设备中人体通信技术的分析方法。展开更多
To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valle...To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valley were analyzed by using the equivalent-linear model. Statistical analysis was also made to the seismic coefficient, and an empirical formula for calculating the maximum acceleration was provided. The results indicate that under the condition of the same dam height and the same base acceleration excitations, with the increase of the river valley width, the position of the maximum acceleration on the axis of the top of the dam moves from the center to the riversides symmetrically. For the narrow valleys, the maximum acceleration occurs in the middle of the axis at the top of the dam; for wide valleys the maximum acceleration appears near the riversides. The result negates the application of 2D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic coefficient along the axis should be given, except for that along the dam height. Seismic stability analysis of rockfill dams using pseudo-static method can be modified according to the formula.展开更多
文摘针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立了人体通信模型,仿真结果与等效电路分析方法计算的信道增益差距小于1 d B。仿真分析表明:该分析方法能够准确地描述可穿戴设备中人体通信信道的特性,完善了可穿戴设备中人体通信技术的分析方法。
基金Project(90815024) supported by the National Natural Science Foundation of China
文摘To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valley were analyzed by using the equivalent-linear model. Statistical analysis was also made to the seismic coefficient, and an empirical formula for calculating the maximum acceleration was provided. The results indicate that under the condition of the same dam height and the same base acceleration excitations, with the increase of the river valley width, the position of the maximum acceleration on the axis of the top of the dam moves from the center to the riversides symmetrically. For the narrow valleys, the maximum acceleration occurs in the middle of the axis at the top of the dam; for wide valleys the maximum acceleration appears near the riversides. The result negates the application of 2D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic coefficient along the axis should be given, except for that along the dam height. Seismic stability analysis of rockfill dams using pseudo-static method can be modified according to the formula.
