In this article, we propose two control charts namely, the “Multivariate Group Runs’ (MV-GR-M)” and the “Multivariate Modified Group Runs’ (MV-MGR-M)” control charts, based on the multivariate normal processes, ...In this article, we propose two control charts namely, the “Multivariate Group Runs’ (MV-GR-M)” and the “Multivariate Modified Group Runs’ (MV-MGR-M)” control charts, based on the multivariate normal processes, for monitoring the process mean vector. Methods to obtain the design parameters and operations of these control charts are discussed. Performances of the proposed charts are compared with some existing control charts. It is verified that, the proposed charts give a significant reduction in the out-of-control “Average Time to Signal” (ATS) in the zero state, as well in the steady state compared to the Hotelling’s T2 and the synthetic T2 control charts.展开更多
为构建更接近真实的高分辨率三维海底地形,满足舰船安全高效航行及水下地形匹配导航需求,运用迭代函数系统(IFS,iterated function system)分形插值方法,对原始网格水深数据样本,根据其密度及震荡程度的差异,调节不同的垂直比例因子得...为构建更接近真实的高分辨率三维海底地形,满足舰船安全高效航行及水下地形匹配导航需求,运用迭代函数系统(IFS,iterated function system)分形插值方法,对原始网格水深数据样本,根据其密度及震荡程度的差异,调节不同的垂直比例因子得到细化的分形插值结果,以描述海底地形的起伏变化。仿真结果表明,对于平坦或缓坡海底地形,垂直比例因子在[0.05,0.2]区间构建结果能兼顾海底地貌的自相似与光滑要求;对于高频震荡海底地形,垂直比例因子在[0.3,0.5]区间构建结果牺牲一定光滑度条件下更能正确处理海底地形全貌与局部之间的关系,高度逼近海底地形自然地貌。样本数据均匀抽稀后,调节垂直比例因子,构建结果整体上可以与原始样本高度逼近,尤其在震荡剧烈的海底地形构建中具有优越性。展开更多
文摘In this article, we propose two control charts namely, the “Multivariate Group Runs’ (MV-GR-M)” and the “Multivariate Modified Group Runs’ (MV-MGR-M)” control charts, based on the multivariate normal processes, for monitoring the process mean vector. Methods to obtain the design parameters and operations of these control charts are discussed. Performances of the proposed charts are compared with some existing control charts. It is verified that, the proposed charts give a significant reduction in the out-of-control “Average Time to Signal” (ATS) in the zero state, as well in the steady state compared to the Hotelling’s T2 and the synthetic T2 control charts.
文摘为构建更接近真实的高分辨率三维海底地形,满足舰船安全高效航行及水下地形匹配导航需求,运用迭代函数系统(IFS,iterated function system)分形插值方法,对原始网格水深数据样本,根据其密度及震荡程度的差异,调节不同的垂直比例因子得到细化的分形插值结果,以描述海底地形的起伏变化。仿真结果表明,对于平坦或缓坡海底地形,垂直比例因子在[0.05,0.2]区间构建结果能兼顾海底地貌的自相似与光滑要求;对于高频震荡海底地形,垂直比例因子在[0.3,0.5]区间构建结果牺牲一定光滑度条件下更能正确处理海底地形全貌与局部之间的关系,高度逼近海底地形自然地貌。样本数据均匀抽稀后,调节垂直比例因子,构建结果整体上可以与原始样本高度逼近,尤其在震荡剧烈的海底地形构建中具有优越性。
