With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration...With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration system is important.The deterioration process of the discussed system is described by a Gamma process.The predictive maintenance is considered to be imperfect and formulated.The expected interval of two continuous preventive maintenances is derived.Then,the maintenance optimization model of the continuously monitored deterioration system is presented.In the model,the minimization of the expected operational cost per unit time and the maximization of the system availability are the optimization objectives.The improved ideal point method with the normalized objective functions is employed to solve the proposed model.The validity and sensitivity of the proposed multiobjective maintenance optimization model are analyzed by a numerical example.展开更多
目的:探讨阻塞性睡眠呼吸暂停综合征(OSAS)患者病情严重程度与夜间心律失常的关系,以及经鼻持续气道内正压(nCPAP)通气治疗对心律失常的影响。方法:183例OSAS患者按睡眠呼吸暂停／低通气指数(AHI)分轻、中、重三组,观察夜间最低血氧饱和...目的:探讨阻塞性睡眠呼吸暂停综合征(OSAS)患者病情严重程度与夜间心律失常的关系,以及经鼻持续气道内正压(nCPAP)通气治疗对心律失常的影响。方法:183例OSAS患者按睡眠呼吸暂停／低通气指数(AHI)分轻、中、重三组,观察夜间最低血氧饱和度,窦停,Ⅱ、Ⅲ度房室传导阻滞,室早总数、心律失常总数及发生率,比较组间差异性,并对130例患者进行了nCPAP治疗前后上述各项参数的比较。结果:OSAS夜间心律失常随病情程度加重而明显加重。轻度、中度、重度患者组间两两比较上述各项参数有显著差异(P均<0．05);nCPAP治疗7 h 后心律失常均明显改善(P<0．05)。心律失常的发生总数与SaO2最低值呈负相关(r=-0．51,P<0．01)。结论:夜间心律失常随OSAS病情加重而明显加重,nCPAP治疗能明显减轻夜间心律失常。展开更多
基金supported by the Fundamental Research Funds for the Central Universities (N090303005)Key National Science and Technology Special Project (2010ZX04014-014)
文摘With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration system is important.The deterioration process of the discussed system is described by a Gamma process.The predictive maintenance is considered to be imperfect and formulated.The expected interval of two continuous preventive maintenances is derived.Then,the maintenance optimization model of the continuously monitored deterioration system is presented.In the model,the minimization of the expected operational cost per unit time and the maximization of the system availability are the optimization objectives.The improved ideal point method with the normalized objective functions is employed to solve the proposed model.The validity and sensitivity of the proposed multiobjective maintenance optimization model are analyzed by a numerical example.
文摘目的:探讨阻塞性睡眠呼吸暂停综合征(OSAS)患者病情严重程度与夜间心律失常的关系,以及经鼻持续气道内正压(nCPAP)通气治疗对心律失常的影响。方法:183例OSAS患者按睡眠呼吸暂停／低通气指数(AHI)分轻、中、重三组,观察夜间最低血氧饱和度,窦停,Ⅱ、Ⅲ度房室传导阻滞,室早总数、心律失常总数及发生率,比较组间差异性,并对130例患者进行了nCPAP治疗前后上述各项参数的比较。结果:OSAS夜间心律失常随病情程度加重而明显加重。轻度、中度、重度患者组间两两比较上述各项参数有显著差异(P均<0．05);nCPAP治疗7 h 后心律失常均明显改善(P<0．05)。心律失常的发生总数与SaO2最低值呈负相关(r=-0．51,P<0．01)。结论:夜间心律失常随OSAS病情加重而明显加重,nCPAP治疗能明显减轻夜间心律失常。
