Given that the overlapping of jobs is permitted, the paper studies the scheduling and control of failure prone production systems, i.e. so-called settings with demand uncertainty and job overlaps. Because a variable d...Given that the overlapping of jobs is permitted, the paper studies the scheduling and control of failure prone production systems, i.e. so-called settings with demand uncertainty and job overlaps. Because a variable demand resource is involved in the production and corrective maintenance control problems of the system, which switched randomly between zero and a maximum level, it is difficult to obtain the analytical solutions of the optimal single hedging point policy. An asymptotic optimal scheduling policy is presented and a double hedging point policy is offered to control simultaneously the production rate and the corrective maintenance rate of the system. The corresponding analytical solutions and approximate solutions are obtained. Considering the relationship of production, corrective maintenance and demand variable, an approximate optimal single hedging point control policy is proposed. Numerical results are presented.展开更多
目的系统评价中药治疗哮喘-慢阻肺(ACO)的疗效与安全性。方法全面检索PubMed、Cochrane Library、Web of Science、中国知网、万方、维普、中国医学文献数据库,纳入有关中医药治疗ACO的随机对照试验(RCT),运用Cochrane手册对纳入研究的...目的系统评价中药治疗哮喘-慢阻肺(ACO)的疗效与安全性。方法全面检索PubMed、Cochrane Library、Web of Science、中国知网、万方、维普、中国医学文献数据库,纳入有关中医药治疗ACO的随机对照试验(RCT),运用Cochrane手册对纳入研究的方法学质量进行评估,采用Review Manager 5.3进行Meta分析。结果共纳入32项RCT,包括2688例ACO患者,其中试验组1361例,对照组1327例。Meta分析结果显示,中医药可以显著改善ACO患者的中医证候疗效[RR=1.19,95%CI(1.13,1.25),P<0.00001]、CAT评分[MD=-3.62,95%CI(-4.37,-2.87),P<0.00001]、ACT评分[MD=3.42,95%CI(2.23,4.62),P<0.00001],、中医证候总积分[MD=-3.61,95%CI(-4.83,-2.39),P<0.00001]、FEV1[MD=0.59,95%CI(0.08,1.10),P=0.02]、FEV1%[MD=8.61,95%CI(5.20,12.1),P<0.00001]、FEV1/FVC[MD=6.52,95%CI(4.24,8.80),P<0.00001]、6 min步行实验[MD=41.18,95%CI(22.15,60.21),P<0.0001]、急性发作次数[MD=-2.46,95%CI(-3.62,-1.13),P<0.0001]。所有研究均未报道严重不良反应。结论中药治疗ACO,可以显著提高临床疗效,改善患者的肺功能且具有较好安全性,但是需要更高质量、多样本、多中心的随机对照试验进一步确认。展开更多
基金This work was supported by the Project 973 (No.2002CB312200) and the National Natural Science Foundation (No.60404018).
文摘Given that the overlapping of jobs is permitted, the paper studies the scheduling and control of failure prone production systems, i.e. so-called settings with demand uncertainty and job overlaps. Because a variable demand resource is involved in the production and corrective maintenance control problems of the system, which switched randomly between zero and a maximum level, it is difficult to obtain the analytical solutions of the optimal single hedging point policy. An asymptotic optimal scheduling policy is presented and a double hedging point policy is offered to control simultaneously the production rate and the corrective maintenance rate of the system. The corresponding analytical solutions and approximate solutions are obtained. Considering the relationship of production, corrective maintenance and demand variable, an approximate optimal single hedging point control policy is proposed. Numerical results are presented.
