目的：探讨添加益生菌的早期肠内营养对重型颅脑损伤患者临床结局的影响.方法：电子检索PubMed、Cochrane CentralRegister of Controlled Trials（CENTRAL）、中国知网（China National Knowledge Infrastructure,CNKI）、万方及中国...目的：探讨添加益生菌的早期肠内营养对重型颅脑损伤患者临床结局的影响.方法：电子检索PubMed、Cochrane CentralRegister of Controlled Trials（CENTRAL）、中国知网（China National Knowledge Infrastructure,CNKI）、万方及中国生物医学文献数据库（Chinese Biomedical Literature Database,CBM）中有关添加益生菌的早期肠内营养对重型颅脑损伤患者临床结局影响的随机对照研究（Randomizedcontrolledtrials,RCTs）,并手工检索合格研究及主题相关综述的参考文献.2位研究者独立筛查文献、提取资料、评价合格研究的偏倚风险后,采用STATA12.0软件行Meta分析.伦理与发布：本研究所有分析均基于已发表研究中所报告数据,因此不需要签署伦理许可和患者知情同意书.本系统评价全文完成后,将发表于同行评审的期刊杂志.展开更多
In recent years, we have seen an increasing interest in developing and designing Wireless Sensor Networks (WSNs). WSNs consist of large number of nodes, with wireless communications and computation abilities that can ...In recent years, we have seen an increasing interest in developing and designing Wireless Sensor Networks (WSNs). WSNs consist of large number of nodes, with wireless communications and computation abilities that can be used in variety of domains. It has been used in areas that have direct contact with monitoring and gathering data, to name few, health monitoring, military surveillance, geological monitoring (Earthquakes, Volcanoes, Tsunami), agriculture control and many more. However, the design and implementation of WSNs face many challenges, due to the power limitation of sensor nodes, deployment and localization, data routing and data aggregation, data security, limited bandwidth, storage capacity and network management. It is known that Operation Research (OR) has been widely used in different areas to solve optimization problems;such as improving network performance and maximizing lifetime of system. In this survey, we present the most recent OR based techniques applied to solve different WSNs problems: the node scheduling problem, energy management problems, nodes allocating issues and other WSNs related complex problems. Different Operational Research techniques are presented and discussed in details here, including graph theory based techniques, linear programing and mixed integer programming related approaches.展开更多
文摘目的：探讨添加益生菌的早期肠内营养对重型颅脑损伤患者临床结局的影响.方法：电子检索PubMed、Cochrane CentralRegister of Controlled Trials（CENTRAL）、中国知网（China National Knowledge Infrastructure,CNKI）、万方及中国生物医学文献数据库（Chinese Biomedical Literature Database,CBM）中有关添加益生菌的早期肠内营养对重型颅脑损伤患者临床结局影响的随机对照研究（Randomizedcontrolledtrials,RCTs）,并手工检索合格研究及主题相关综述的参考文献.2位研究者独立筛查文献、提取资料、评价合格研究的偏倚风险后,采用STATA12.0软件行Meta分析.伦理与发布：本研究所有分析均基于已发表研究中所报告数据,因此不需要签署伦理许可和患者知情同意书.本系统评价全文完成后,将发表于同行评审的期刊杂志.
文摘In recent years, we have seen an increasing interest in developing and designing Wireless Sensor Networks (WSNs). WSNs consist of large number of nodes, with wireless communications and computation abilities that can be used in variety of domains. It has been used in areas that have direct contact with monitoring and gathering data, to name few, health monitoring, military surveillance, geological monitoring (Earthquakes, Volcanoes, Tsunami), agriculture control and many more. However, the design and implementation of WSNs face many challenges, due to the power limitation of sensor nodes, deployment and localization, data routing and data aggregation, data security, limited bandwidth, storage capacity and network management. It is known that Operation Research (OR) has been widely used in different areas to solve optimization problems;such as improving network performance and maximizing lifetime of system. In this survey, we present the most recent OR based techniques applied to solve different WSNs problems: the node scheduling problem, energy management problems, nodes allocating issues and other WSNs related complex problems. Different Operational Research techniques are presented and discussed in details here, including graph theory based techniques, linear programing and mixed integer programming related approaches.
