为了解决航天发射场复杂可维修多阶段任务系统(phased-mission system,PMS)的任务可靠性评估问题,依据考虑维修的多阶段任务系统(phased-mission system considering maintenance,PMSCM)理论和蒙特卡罗方法,基于系统特殊的任务成功定义...为了解决航天发射场复杂可维修多阶段任务系统(phased-mission system,PMS)的任务可靠性评估问题,依据考虑维修的多阶段任务系统(phased-mission system considering maintenance,PMSCM)理论和蒙特卡罗方法,基于系统特殊的任务成功定义规则,通过任务阶段的形式化描述与零部件的虚节点处理,建立可靠性评估仿真模型。将模型应用于航天发射场垂直总装厂房液压系统,成功分析了系统多阶段任务的可靠性均值、方差和置信区间。仿真结果表明:该模型能够找出系统的关键部件,为垂直总装厂房及航天发射场系统总体任务进行可靠性预计、分配和评估提供重要参考和决策支持。展开更多
Objectives: To assess the efficacy and safety of modified Xiaoyao San (XYS) for treating Perimenopausal syndrome (PMS). Methods: Literature searches were carried out on PubMed, Cochrane Library, CNKI Database, Chinese...Objectives: To assess the efficacy and safety of modified Xiaoyao San (XYS) for treating Perimenopausal syndrome (PMS). Methods: Literature searches were carried out on PubMed, Cochrane Library, CNKI Database, Chinese Biomedical Literature Database, Wan Fang Database, and VIP Database up to December 2018. Hand search for further references was conducted. Study selection, data extraction, quality assessment, and data analyses were performed as request of the Cochrane standards. Results: Nine publications in total were suitable for inclusion. There was evidence that modified XYS was tested to be more effective in improving overall symptoms compared with HRT (odds ratio 3.50, 95% CI 2.56 to 4.78). Whereas HRT was more sensitive and direct in decreasing FSH (WMD 6.69, 95% CI 5.60 to 9.52) and LH (WMD 7.00, 95% CI, 5.75 to 8.25) in comparison with XYS group. It was also strongly supported that XYS had less adverse effect than HRT (odds ratio 0.07, 95% CI 0.05 to 0.10). Conclusion: Modified XYS might be more effective and safer in treatment of perimenopausal syndrome. However, due to poor methodological quality in the majority of included studies, the potential benefit and safety about XYS need to be confirmed in rigorously designed, multi-centre, and large-scale trials.展开更多
随着电力系统的发展,工程生产管理系统(Power Production Management System,PMS)在电网中的应用日益广泛。PMS系统不仅便于电网的监控和管理,而且在提高电网稳定性和效率等方面具有重要作用。因此,介绍海上油田孤立电网中PMS的特点、...随着电力系统的发展,工程生产管理系统(Power Production Management System,PMS)在电网中的应用日益广泛。PMS系统不仅便于电网的监控和管理,而且在提高电网稳定性和效率等方面具有重要作用。因此,介绍海上油田孤立电网中PMS的特点、硬件构成以及基本控制功能,说明卸载策略和分析方法,提出能源经济优化是PMS后续的改进方向。展开更多
文摘为了解决航天发射场复杂可维修多阶段任务系统(phased-mission system,PMS)的任务可靠性评估问题,依据考虑维修的多阶段任务系统(phased-mission system considering maintenance,PMSCM)理论和蒙特卡罗方法,基于系统特殊的任务成功定义规则,通过任务阶段的形式化描述与零部件的虚节点处理,建立可靠性评估仿真模型。将模型应用于航天发射场垂直总装厂房液压系统,成功分析了系统多阶段任务的可靠性均值、方差和置信区间。仿真结果表明:该模型能够找出系统的关键部件,为垂直总装厂房及航天发射场系统总体任务进行可靠性预计、分配和评估提供重要参考和决策支持。
文摘Objectives: To assess the efficacy and safety of modified Xiaoyao San (XYS) for treating Perimenopausal syndrome (PMS). Methods: Literature searches were carried out on PubMed, Cochrane Library, CNKI Database, Chinese Biomedical Literature Database, Wan Fang Database, and VIP Database up to December 2018. Hand search for further references was conducted. Study selection, data extraction, quality assessment, and data analyses were performed as request of the Cochrane standards. Results: Nine publications in total were suitable for inclusion. There was evidence that modified XYS was tested to be more effective in improving overall symptoms compared with HRT (odds ratio 3.50, 95% CI 2.56 to 4.78). Whereas HRT was more sensitive and direct in decreasing FSH (WMD 6.69, 95% CI 5.60 to 9.52) and LH (WMD 7.00, 95% CI, 5.75 to 8.25) in comparison with XYS group. It was also strongly supported that XYS had less adverse effect than HRT (odds ratio 0.07, 95% CI 0.05 to 0.10). Conclusion: Modified XYS might be more effective and safer in treatment of perimenopausal syndrome. However, due to poor methodological quality in the majority of included studies, the potential benefit and safety about XYS need to be confirmed in rigorously designed, multi-centre, and large-scale trials.
文摘随着电力系统的发展,工程生产管理系统(Power Production Management System,PMS)在电网中的应用日益广泛。PMS系统不仅便于电网的监控和管理,而且在提高电网稳定性和效率等方面具有重要作用。因此,介绍海上油田孤立电网中PMS的特点、硬件构成以及基本控制功能,说明卸载策略和分析方法,提出能源经济优化是PMS后续的改进方向。
