目的探讨急性心肌梗死患者院前延迟的影响因素,并明确应对策略,旨在缩短院前延迟时间。方法经Pubmed、Embase等十大数据库检索相关文献,用NOS量表评价纳入文献19篇,均为流行病调查研究,以Rev Man 5.3软件进行统计分析。结果通过Meta分...目的探讨急性心肌梗死患者院前延迟的影响因素,并明确应对策略,旨在缩短院前延迟时间。方法经Pubmed、Embase等十大数据库检索相关文献,用NOS量表评价纳入文献19篇,均为流行病调查研究,以Rev Man 5.3软件进行统计分析。结果通过Meta分析将影响因素归纳为3大类。①社会因素:年龄[OR=1.090,95%CI(1.060～1.130),P<0.001]、性别[OR=1.180,95%CI(1.050～1.330),P=0.006]、文化水平[OR=1.410,95%CI(1.190～1.670),P<0.001]、居住地区[OR=1.350,95%CI(0.990～1.840),P=0.060];②临床因素:糖尿病史[OR=1.380,95%CI(1.220～1.560),P<0.001]、心绞痛史[OR=1.370,95%CI=1.050～1.770,P=0.020]、心肌梗死史[OR=1.080,95%CI(0.640～1.830),P=0.760]、PCI史[OR=0.760,95%CI(0.670～0.860),P<0.001];③其他因素:夜间发病[OR=1.630,95%CI(1.340～1.970),P<0.001]、就诊方式[OR=0.640,95%CI(0.570～0.710),P<0.001]、未将症状归因于心脏[OR=3.100,95%CI(1.620～5.940),P<0.001]。结论高龄、女性、糖尿病史、心绞痛史、夜间发病、未将症状归因于心脏是其危险因素,高学历、PCI史、EMS就诊是其保护因素,居住地区、心肌梗死史与急性心肌梗死患者院前延迟无关。采取切实有效地干预措施,能够缩短院前延迟时间,降低患者院外死亡率。展开更多
针对分区调度算法在实时多处理器系统中处理器利用率不高的现象,提出一种基于利用率和负载均衡的分区调度算法BUWBPA(Based on Utilization and Workload Balance Partition Algorithm)。该算法在满足任务实时性要求的基础上,以寻求高...针对分区调度算法在实时多处理器系统中处理器利用率不高的现象,提出一种基于利用率和负载均衡的分区调度算法BUWBPA(Based on Utilization and Workload Balance Partition Algorithm)。该算法在满足任务实时性要求的基础上,以寻求高利用率和负载均衡为目标进行任务分配,将任务分配分成两个阶段:第一个阶段以高利用率为原则,选择任务集内利用率最高的任务先分配;第二个阶段以负载均衡为原则,根据处理器数选择利用率总和等于1或接近于1的任务进行分配,并且在此阶段对于未达到充分利用的处理器,选取可能调度的零星任务,对任务进行再次重新分配,以达到负载均衡和系统最大利用率。实验证明,该算法在实现最大利用率的前提下能很好地达到负载均衡。展开更多
This paper presents an online evaluation approach of time delays for networked control systems (NCS), which characterizes the time delays without any synchronized clock in the network and any assumptions of time delay...This paper presents an online evaluation approach of time delays for networked control systems (NCS), which characterizes the time delays without any synchronized clock in the network and any assumptions of time delays. With this approach, an optimal control scheme based on the approach is designed to achieve the desired performance despite the uncertain delays in the system. The experimental results based on CANbus illustrate the effectiveness of the proposed control design and satisfactory performance of the closed-loop system.展开更多
This paper presented an evaluation approach of time delays for networked control systems (NCS). An improved scheme based on optimal LQG control was designed to achieve desired performance despite the uncertain delays ...This paper presented an evaluation approach of time delays for networked control systems (NCS). An improved scheme based on optimal LQG control was designed to achieve desired performance despite the uncertain delays in the system. The experimental results illustrate the effectiveness of the proposed control design and satisfactory performance of the closed loop system.展开更多
文摘目的探讨急性心肌梗死患者院前延迟的影响因素,并明确应对策略,旨在缩短院前延迟时间。方法经Pubmed、Embase等十大数据库检索相关文献,用NOS量表评价纳入文献19篇,均为流行病调查研究,以Rev Man 5.3软件进行统计分析。结果通过Meta分析将影响因素归纳为3大类。①社会因素:年龄[OR=1.090,95%CI(1.060～1.130),P<0.001]、性别[OR=1.180,95%CI(1.050～1.330),P=0.006]、文化水平[OR=1.410,95%CI(1.190～1.670),P<0.001]、居住地区[OR=1.350,95%CI(0.990～1.840),P=0.060];②临床因素:糖尿病史[OR=1.380,95%CI(1.220～1.560),P<0.001]、心绞痛史[OR=1.370,95%CI=1.050～1.770,P=0.020]、心肌梗死史[OR=1.080,95%CI(0.640～1.830),P=0.760]、PCI史[OR=0.760,95%CI(0.670～0.860),P<0.001];③其他因素:夜间发病[OR=1.630,95%CI(1.340～1.970),P<0.001]、就诊方式[OR=0.640,95%CI(0.570～0.710),P<0.001]、未将症状归因于心脏[OR=3.100,95%CI(1.620～5.940),P<0.001]。结论高龄、女性、糖尿病史、心绞痛史、夜间发病、未将症状归因于心脏是其危险因素,高学历、PCI史、EMS就诊是其保护因素,居住地区、心肌梗死史与急性心肌梗死患者院前延迟无关。采取切实有效地干预措施,能够缩短院前延迟时间,降低患者院外死亡率。
文摘针对分区调度算法在实时多处理器系统中处理器利用率不高的现象,提出一种基于利用率和负载均衡的分区调度算法BUWBPA(Based on Utilization and Workload Balance Partition Algorithm)。该算法在满足任务实时性要求的基础上,以寻求高利用率和负载均衡为目标进行任务分配,将任务分配分成两个阶段:第一个阶段以高利用率为原则,选择任务集内利用率最高的任务先分配;第二个阶段以负载均衡为原则,根据处理器数选择利用率总和等于1或接近于1的任务进行分配,并且在此阶段对于未达到充分利用的处理器,选取可能调度的零星任务,对任务进行再次重新分配,以达到负载均衡和系统最大利用率。实验证明,该算法在实现最大利用率的前提下能很好地达到负载均衡。
文摘This paper presents an online evaluation approach of time delays for networked control systems (NCS), which characterizes the time delays without any synchronized clock in the network and any assumptions of time delays. With this approach, an optimal control scheme based on the approach is designed to achieve the desired performance despite the uncertain delays in the system. The experimental results based on CANbus illustrate the effectiveness of the proposed control design and satisfactory performance of the closed-loop system.
文摘This paper presented an evaluation approach of time delays for networked control systems (NCS). An improved scheme based on optimal LQG control was designed to achieve desired performance despite the uncertain delays in the system. The experimental results illustrate the effectiveness of the proposed control design and satisfactory performance of the closed loop system.
