目的量化关于心脏手术体外循环目标导向灌注(GDP)相关学术论文的基本信息,探索关于GDP研究领域的研究热点、趋势及最具有影响力的论文,为研究人员及临床工作者提供参考。方法利用科学网(Web of Science)检索GDP相关文献,使用R语言数据包...目的量化关于心脏手术体外循环目标导向灌注(GDP)相关学术论文的基本信息,探索关于GDP研究领域的研究热点、趋势及最具有影响力的论文,为研究人员及临床工作者提供参考。方法利用科学网(Web of Science)检索GDP相关文献,使用R语言数据包Bibliometrix对文献的发表年代、期刊来源及期刊所属国家、高频关键词的分布情况进行统计分析,并进行聚类分析,得到该GDP研究领域关注热点。结果筛选出GDP相关文献116篇,获得该领域研究热度趋势、来源期刊分布、各国研究热度等数据资料。高频关键词共计15个,通过对高频关键词进行聚类分析,得到3个主要研究热点方向。关于GDP研究领域的热点有氧供指数、氧耗监测、组织灌注监测等。结论GDP研究热点主要为GDP研究内容和技术、对象、临床结局。基于文献计量学的研究方法,本研究提供较为全面的关于GDP研究领域发展的分析总结,未来该领域的氧供与氧耗监测与调控仍可能是热门研究方向。展开更多
The source location based on the hybrid time difference of arrival(TDOA)/frequency difference of arrival(FDOA) is a basic problem in wireless sensor networks, and the layout of sensors in the hybrid TDOA/FDOA position...The source location based on the hybrid time difference of arrival(TDOA)/frequency difference of arrival(FDOA) is a basic problem in wireless sensor networks, and the layout of sensors in the hybrid TDOA/FDOA positioning will greatly affect the accuracy of positioning. Using unmanned aerial vehicle(UAV) as base stations, by optimizing the trajectory of the UAV swarm, an optimal positioning configuration is formed to improve the accuracy of the target position and velocity estimation. In this paper, a hybrid TDOA/FDOA positioning model is first established, and the positioning accuracy of the hybrid TDOA/FDOA under different positioning configurations and different measurement errors is simulated by the geometric dilution of precision(GDOP) factor. Second, the Cramer-Rao lower bound(CRLB) matrix of hybrid TDOA/FDOA location under different moving states of the target is derived theoretically, the objective function of the track optimization is obtained, and the track of the UAV swarm is optimized in real time. The simulation results show that the track optimization effectively improves the accuracy of the target position and velocity estimation.展开更多
文摘目的量化关于心脏手术体外循环目标导向灌注(GDP)相关学术论文的基本信息,探索关于GDP研究领域的研究热点、趋势及最具有影响力的论文,为研究人员及临床工作者提供参考。方法利用科学网(Web of Science)检索GDP相关文献,使用R语言数据包Bibliometrix对文献的发表年代、期刊来源及期刊所属国家、高频关键词的分布情况进行统计分析,并进行聚类分析,得到该GDP研究领域关注热点。结果筛选出GDP相关文献116篇,获得该领域研究热度趋势、来源期刊分布、各国研究热度等数据资料。高频关键词共计15个,通过对高频关键词进行聚类分析,得到3个主要研究热点方向。关于GDP研究领域的热点有氧供指数、氧耗监测、组织灌注监测等。结论GDP研究热点主要为GDP研究内容和技术、对象、临床结局。基于文献计量学的研究方法,本研究提供较为全面的关于GDP研究领域发展的分析总结,未来该领域的氧供与氧耗监测与调控仍可能是热门研究方向。
基金supported by the National Natural Science Foundation of China (61502522)Equipment Pre-Research Field Fund(JZX7Y20190253036101)+1 种基金Equipment Pre-Research Ministry of Education Joint Fund (6141A02033703)Hubei Provincial Natural Scie nce Foundation (2019CFC897)。
文摘The source location based on the hybrid time difference of arrival(TDOA)/frequency difference of arrival(FDOA) is a basic problem in wireless sensor networks, and the layout of sensors in the hybrid TDOA/FDOA positioning will greatly affect the accuracy of positioning. Using unmanned aerial vehicle(UAV) as base stations, by optimizing the trajectory of the UAV swarm, an optimal positioning configuration is formed to improve the accuracy of the target position and velocity estimation. In this paper, a hybrid TDOA/FDOA positioning model is first established, and the positioning accuracy of the hybrid TDOA/FDOA under different positioning configurations and different measurement errors is simulated by the geometric dilution of precision(GDOP) factor. Second, the Cramer-Rao lower bound(CRLB) matrix of hybrid TDOA/FDOA location under different moving states of the target is derived theoretically, the objective function of the track optimization is obtained, and the track of the UAV swarm is optimized in real time. The simulation results show that the track optimization effectively improves the accuracy of the target position and velocity estimation.
