Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content deliver...Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content delivery over the seamless global coverage area. However, the on-board supportable resources of a single satellite are extremely limited and lack of interaction with others. In this paper, we design a network model with two-layered cache deployment, i.e., satellite layer and ground base station layer, and two types of sharing links, i.e., terrestrial-satellite sharing(TSS) links and inter-satellite sharing(ISS) links, to enhance the capability of cooperative delivery over STINs. Thus, we use rateless codes for the content divided-packet transmission, and derive the total energy efficiency(EE) in the whole transmission procedure, which is defined as the ratio of traffic offloading and energy consumption. We formulate two optimization problems about maximizing EE in different sharing scenarios(only TSS and TSS-ISS),and propose two optimized algorithms to obtain the optimal content placement matrixes, respectively.Simulation results demonstrate that, enabling sharing links with optimized cache placement have more than 2 times improvement of EE performance than other traditional placement schemes. Particularly, TSS-ISS schemes have the higher EE performance than only TSS schemes under the conditions of enough number of satellites and smaller inter-satellite distances.展开更多
目的探讨质量持续改进在降低药物使用错误率中的应用效果。方法成立护理部药品管理质控小组,运用网络信息化报告系统平台进行全程质量监控,通过戴明循环法(Plan-Do-Check-Act,PDCA)总结问题、制定改进措施。对比质量持续改进前(2022年1...目的探讨质量持续改进在降低药物使用错误率中的应用效果。方法成立护理部药品管理质控小组,运用网络信息化报告系统平台进行全程质量监控,通过戴明循环法(Plan-Do-Check-Act,PDCA)总结问题、制定改进措施。对比质量持续改进前(2022年1—6月)、后(2022年7—12月)药物使用错误情况变化。结果改进后的给药差错发生率为0.03‰,低于改进前的0.08‰(P<0.05);改进后的个人数字助理(personal digital assistant,PDA)执行率、考核合格率高于改进前,差异有统计学意义(P<0.05)。结论成立专项质量持续改进小组,动态分析原因,提出并落实改进措施,有效降低给药差错发生率。展开更多
基金supported by National Natural Sciences Foundation of China(No.62271165,62027802,61831008)the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515030297,2021A1515011572)Shenzhen Science and Technology Program ZDSYS20210623091808025,Stable Support Plan Program GXWD20231129102638002.
文摘Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content delivery over the seamless global coverage area. However, the on-board supportable resources of a single satellite are extremely limited and lack of interaction with others. In this paper, we design a network model with two-layered cache deployment, i.e., satellite layer and ground base station layer, and two types of sharing links, i.e., terrestrial-satellite sharing(TSS) links and inter-satellite sharing(ISS) links, to enhance the capability of cooperative delivery over STINs. Thus, we use rateless codes for the content divided-packet transmission, and derive the total energy efficiency(EE) in the whole transmission procedure, which is defined as the ratio of traffic offloading and energy consumption. We formulate two optimization problems about maximizing EE in different sharing scenarios(only TSS and TSS-ISS),and propose two optimized algorithms to obtain the optimal content placement matrixes, respectively.Simulation results demonstrate that, enabling sharing links with optimized cache placement have more than 2 times improvement of EE performance than other traditional placement schemes. Particularly, TSS-ISS schemes have the higher EE performance than only TSS schemes under the conditions of enough number of satellites and smaller inter-satellite distances.
文摘目的探讨质量持续改进在降低药物使用错误率中的应用效果。方法成立护理部药品管理质控小组,运用网络信息化报告系统平台进行全程质量监控,通过戴明循环法(Plan-Do-Check-Act,PDCA)总结问题、制定改进措施。对比质量持续改进前(2022年1—6月)、后(2022年7—12月)药物使用错误情况变化。结果改进后的给药差错发生率为0.03‰,低于改进前的0.08‰(P<0.05);改进后的个人数字助理(personal digital assistant,PDA)执行率、考核合格率高于改进前,差异有统计学意义(P<0.05)。结论成立专项质量持续改进小组,动态分析原因,提出并落实改进措施,有效降低给药差错发生率。
