Due to lacking of test-data and field-data in reliability research during the design stage of manufacturing cell sys- tem.The degree of manufacturing cell system reliability research is increased.In order to deal with...Due to lacking of test-data and field-data in reliability research during the design stage of manufacturing cell sys- tem.The degree of manufacturing cell system reliability research is increased.In order to deal with the deficient data and the un- certainty occurred from analysis and judgment,the paper discussed a method for studying reliability of manufacturing cell system through the analysis of fuzzy fault tree,which was based on triangular fuzzy number.At last,calculation case indicated that it would have great significance for ascertaining reliability index,maintenance and establishing keeping strategy towards manufac- turing cell system.展开更多
正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选...正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选择和天线模块的功率限制,提出了一种正三角形小区通信系统(triangular cellular communication system,TCCS)和相应的下行功率控制策略.基于多小区环境和单用户系统的假设,研究了TCCS的中断容量.仿真实验表明,TCCS在小区的不同部分都具有平坦的容量分布.实验数值分析进一步说明,即使各天线模块都有功率限制,TCCS仍然可以增大覆盖面积,并且TCCS的容量高于使用传统分布式功控策略系统.展开更多
为了解决利用时域有限差分(finite difference timedomain,FDTD)方法实现凸体的电磁散射特性数值计算中,普遍遇到的Yee元胞建模问题,该文提出了关于凸体的一种新的Yee元胞建模方法。其主要思路是利用凸面几何学的理论判断空间任意一点...为了解决利用时域有限差分(finite difference timedomain,FDTD)方法实现凸体的电磁散射特性数值计算中,普遍遇到的Yee元胞建模问题,该文提出了关于凸体的一种新的Yee元胞建模方法。其主要思路是利用凸面几何学的理论判断空间任意一点和凸体每一个体元之间的位置关系,进而可以判断此点与整个凸体的位置关系,由此建立了凸体的Yee元胞建模方法。此种方法称为凸体的凸面几何学Yee元胞建模(convex geometry Yee cells model building of convexobject,CGYCMBCO)方法。CGYCMBCO方法给出了4个凸体的Yee元胞建模的实验结果,实验结果表明CGYCMBCO方法适用于任意凸体,能给出任意凸体的Yee元胞。展开更多
基金Funded by Key Subject Corporate Item of Beijing Education Committee(XK100070534)
文摘Due to lacking of test-data and field-data in reliability research during the design stage of manufacturing cell sys- tem.The degree of manufacturing cell system reliability research is increased.In order to deal with the deficient data and the un- certainty occurred from analysis and judgment,the paper discussed a method for studying reliability of manufacturing cell system through the analysis of fuzzy fault tree,which was based on triangular fuzzy number.At last,calculation case indicated that it would have great significance for ascertaining reliability index,maintenance and establishing keeping strategy towards manufac- turing cell system.
文摘正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选择和天线模块的功率限制,提出了一种正三角形小区通信系统(triangular cellular communication system,TCCS)和相应的下行功率控制策略.基于多小区环境和单用户系统的假设,研究了TCCS的中断容量.仿真实验表明,TCCS在小区的不同部分都具有平坦的容量分布.实验数值分析进一步说明,即使各天线模块都有功率限制,TCCS仍然可以增大覆盖面积,并且TCCS的容量高于使用传统分布式功控策略系统.
文摘为了解决利用时域有限差分(finite difference timedomain,FDTD)方法实现凸体的电磁散射特性数值计算中,普遍遇到的Yee元胞建模问题,该文提出了关于凸体的一种新的Yee元胞建模方法。其主要思路是利用凸面几何学的理论判断空间任意一点和凸体每一个体元之间的位置关系,进而可以判断此点与整个凸体的位置关系,由此建立了凸体的Yee元胞建模方法。此种方法称为凸体的凸面几何学Yee元胞建模(convex geometry Yee cells model building of convexobject,CGYCMBCO)方法。CGYCMBCO方法给出了4个凸体的Yee元胞建模的实验结果,实验结果表明CGYCMBCO方法适用于任意凸体,能给出任意凸体的Yee元胞。
