Reliability Evaluation and Sensitivity Analysis for Multi-state System Based on Time Degradation Measures

The performance and state of multi-state system depend on its structure and different state combinations of the components. In order to evaluate the reliability of multi-state system effectively,a reliability evaluation and sensitivity analysis method based on the time degradation measures was proposed. The equivalence sets of the multi-state system under different output performances were established. The state combinations were classified according to the performance level. The degradation probability models under different states were established,and the new reliability measures,such as dynamic probability of multi-state system,holding time in each state,dynamic expectation function and integrated expectation function of the performance,were proposed and used to implement the dynamic reliability evaluation and sensitivity analysis. A certain diesel engine fuel feeding system was taken as an application example to illustrate the proposed method. The results show that not only the holding time in the desired state of the components and the system can be predicted,but also the best state component in a certain time period can be obtained.

基于Mini-CEX和DOPS的评分量表在创伤骨科规范化教学中的应用

为探讨基于Mini-CEX和DOPS的改良评分量表在创伤骨科规范化教学中的应用价值,选取2016年2月-2018年2月在中山大学孙逸仙纪念医院创伤骨科临床实习及规范化培训的学员共80名,由获得中山大学住院医师规培师资证书的老师进行为期4-24周的临床规范化教学,实习及规培期间先后利用基于Mini-CEX和DOPS的改良评分量表进行测评,每1-3周测评一次,分析比较培训前后Mini-CEX和DOPS评分及其合格率、优秀率。结果显示,Mini-CEX和DOPS在培训末次测评的及格率依次为96.9%和68.8%,优秀率依次为68.8%和21.9%,均高于初次测评。基础临床能力水平均高于临床操作技能水平,且经过临床培训后基础能力较操作技能水平提高更快(P<0.05)。因此,我们认为基于Mini-CEX和DOPS的改良评分量表在创伤骨科规范化教学中操作简单,节省时间,能够在较短时间内提高创伤骨科实习及规培医生的基本临床能力和外科操作技能,促进学员们熟练掌握临床知识。