人工智能及大数据已经成为包括医学教育在内的各研究领域的热点问题。为了阐明人工智能在医学教育中的发展趋势,利用CiteSpace软件分析2013-2022年Web of Science核心合集文献270篇。从发文量、国家和地区、研究机构、作者、发表杂志、...人工智能及大数据已经成为包括医学教育在内的各研究领域的热点问题。为了阐明人工智能在医学教育中的发展趋势,利用CiteSpace软件分析2013-2022年Web of Science核心合集文献270篇。从发文量、国家和地区、研究机构、作者、发表杂志、引文情况、关键词及发展趋势等方面进行综合分析得出研究结论:从2018年开始相关论文呈明显增长趋势,Mayo Clinic(梅奥诊所)成为全球发文量最多的研究机构;Friedman等形成了较为完整的研究团体;JAMA成为最高被引杂志;近年医学教育的人工智能应用研究热点问题主要集中在医学影像及虚拟手术等方面。展开更多
A rapidly deployable dense seismic monitoring system which is capable of transmitting acquired data in real time and analyzing data automatically is crucial in seismic hazard mitigation after a major earthquake.Howeve...A rapidly deployable dense seismic monitoring system which is capable of transmitting acquired data in real time and analyzing data automatically is crucial in seismic hazard mitigation after a major earthquake.However,it is rather difficult for current seismic nodal stations to transmit data in real time for an extended period of time,and it usually takes a great amount of time to process the acquired data manually.To monitor earthquakes in real time flexibly,we develop a mobile integrated seismic monitoring system consisting of newly developed nodal units with 4G telemetry and a real-time AI-assisted automatic data processing workflow.The integrated system is convenient for deployment and has been successfully applied in monitoring the aftershocks of the Yangbi M_(S) 6.4 earthquake occurred on May 21,2021 in Yangbi County,Dali,Yunnan in southwest China.The acquired seismic data are transmitted almost in real time through the 4G cellular network,and then processed automat-ically for event detection,positioning,magnitude calculation and source mechanism inversion.From tens of seconds to a couple of minutes at most,the final seismic attributes can be presented remotely to the end users through the integrated system.From May 27 to June 17,the real-time system has detected and located 7905 aftershocks in the Yangbi area before the internal batteries exhausted,far more than the catalog provided by China Earthquake Networks Center using the regional permanent stations.The initial application of this inte-grated real-time monitoring system is promising,and we anticipate the advent of a new era for Real-time Intelligent Array Seismology(RIAS),for better monitoring and understanding the subsurface dynamic pro-cesses caused by Earth's internal forces as well as anthropogenic activities.展开更多
电磁法在评估压裂液范围及裂缝形态时发挥着重要作用,在压裂监测中应用前景广泛。然而,对于川南地区的大深度页岩气水力压裂监测应用较少。为此,本文基于电磁监测理论,通过简化压裂模型进行数值模拟实验,在建立电磁监测技术的数据处理...电磁法在评估压裂液范围及裂缝形态时发挥着重要作用,在压裂监测中应用前景广泛。然而,对于川南地区的大深度页岩气水力压裂监测应用较少。为此,本文基于电磁监测理论,通过简化压裂模型进行数值模拟实验,在建立电磁监测技术的数据处理流程基础上,结合现场试验,从压裂液波及范围、用液强度、加砂强度、重复改造面积等多方面分析了压裂监测效果,进一步分析了电磁法进行水力压裂裂缝监测的有效性。其中,压裂监测段共计13段,获得各段波及面积4700~24042 m 2,波及宽度36~182 m,平均波及长度207 m。应用实例表明,电磁监测技术能实时了解压裂波及范围与展布形态,对压裂效果评价与施工参数的优化具有一定程度的指导意义。展开更多
文摘人工智能及大数据已经成为包括医学教育在内的各研究领域的热点问题。为了阐明人工智能在医学教育中的发展趋势,利用CiteSpace软件分析2013-2022年Web of Science核心合集文献270篇。从发文量、国家和地区、研究机构、作者、发表杂志、引文情况、关键词及发展趋势等方面进行综合分析得出研究结论:从2018年开始相关论文呈明显增长趋势,Mayo Clinic(梅奥诊所)成为全球发文量最多的研究机构;Friedman等形成了较为完整的研究团体;JAMA成为最高被引杂志;近年医学教育的人工智能应用研究热点问题主要集中在医学影像及虚拟手术等方面。
基金supported by the National Natural Science Foundation of China (under grants 41874048,41790464,41790462).
文摘A rapidly deployable dense seismic monitoring system which is capable of transmitting acquired data in real time and analyzing data automatically is crucial in seismic hazard mitigation after a major earthquake.However,it is rather difficult for current seismic nodal stations to transmit data in real time for an extended period of time,and it usually takes a great amount of time to process the acquired data manually.To monitor earthquakes in real time flexibly,we develop a mobile integrated seismic monitoring system consisting of newly developed nodal units with 4G telemetry and a real-time AI-assisted automatic data processing workflow.The integrated system is convenient for deployment and has been successfully applied in monitoring the aftershocks of the Yangbi M_(S) 6.4 earthquake occurred on May 21,2021 in Yangbi County,Dali,Yunnan in southwest China.The acquired seismic data are transmitted almost in real time through the 4G cellular network,and then processed automat-ically for event detection,positioning,magnitude calculation and source mechanism inversion.From tens of seconds to a couple of minutes at most,the final seismic attributes can be presented remotely to the end users through the integrated system.From May 27 to June 17,the real-time system has detected and located 7905 aftershocks in the Yangbi area before the internal batteries exhausted,far more than the catalog provided by China Earthquake Networks Center using the regional permanent stations.The initial application of this inte-grated real-time monitoring system is promising,and we anticipate the advent of a new era for Real-time Intelligent Array Seismology(RIAS),for better monitoring and understanding the subsurface dynamic pro-cesses caused by Earth's internal forces as well as anthropogenic activities.
文摘针对现有的深度获取方式存在数据缺失、分辨率低等问题,提出一种基于软聚类的深度图增强方法,称为软聚类求解器.该方法利用软聚类的强边缘保持特性提高深度图增强的精度.将软聚类仿射矩阵和加权最小二乘模型有机结合,构建了软聚类求解器中的置信加权最小二乘模型,提出了基于迭代的求解方法.为评估所提出的方法,在多项深度图增强任务上进行试验,包括深度图补洞、深度图超分辨率和深度图纠正,评价指标包含了峰值信噪比(PSNR)、结构相似度(SSIM)、均方根差(RMSE)和运行效率.结果表明:文中方法在深度图补洞任务中的平均PSNR达到了42.28,平均SSIM达到了98.83%;在深度图超分辨率、深度图纠正任务中的平均RMSE达到了8.96、 2.36.文中方法处理1张分辨率为2 048×1 024像素的图像仅需5.03 s.
文摘电磁法在评估压裂液范围及裂缝形态时发挥着重要作用,在压裂监测中应用前景广泛。然而,对于川南地区的大深度页岩气水力压裂监测应用较少。为此,本文基于电磁监测理论,通过简化压裂模型进行数值模拟实验,在建立电磁监测技术的数据处理流程基础上,结合现场试验,从压裂液波及范围、用液强度、加砂强度、重复改造面积等多方面分析了压裂监测效果,进一步分析了电磁法进行水力压裂裂缝监测的有效性。其中,压裂监测段共计13段,获得各段波及面积4700~24042 m 2,波及宽度36~182 m,平均波及长度207 m。应用实例表明,电磁监测技术能实时了解压裂波及范围与展布形态,对压裂效果评价与施工参数的优化具有一定程度的指导意义。
