Pre- and post-earthquake regional loss assessment using deep learning     

Taeyong Kim  Junho Song  Oh-Sung Kwon 《地震工程与结构动力学》2020,49(7):657-678

As urban systems become more highly sophisticated and interdependent, their vulnerability to earthquake events exhibits a significant level of uncertainties. Thus, community-level seismic risk assessments are indispensable to facilitate decision making for effective hazard mitigation and disaster responses. To this end, new frameworks for pre- and post-earthquake regional loss assessments are proposed using deep learning methods. First, to improve the accuracy of the response prediction of individual structures during the pre-earthquake loss assessment, a widely used nonlinear static procedure is replaced by the recently developed probabilistic deep neural network model. The variabilities of the nonlinear responses of a structural system given the seismic intensity can be quantified during the loss assessment process. Second, to facilitate near-real-time post-earthquake loss assessments, an adaptive algorithm, which identifies the optimal number and locations of sensors in a given urban area, is proposed. Using a deep neural network that estimates area-wide structural damage given the spatial distribution of the seismic intensity levels as a surrogate model, the algorithm adaptively places additional sensors at property lots at which errors from surrogate estimations of the structural damage are the greatest. Note that the surrogate model is constructed before earthquake events using simulated datasets. To test and demonstrate the proposed frameworks, the paper introduces thorough numerical investigations of two hypothetical urban communities. The proposed frameworks using the deep learning methods are expected to make critical advances in pre- and post-earthquake regional loss assessments.  相似文献   

基于RS232接口的温度传感器自动检定系统设计     

任燕  王锡芳  郭瑞宝 《气象科技》2014,42(3):409-412

针对目前省级气象计量实验室配备的测试设备大多具有RS232可编程接口,为了提高温度传感器的检定效率,研究了SR253型温控器、精密测温仪和常用的3种扫描采集器等设备的串口通信协议,在VB6.0开发平台下结合SQL Server 2000数据库编程实现了温度传感器的自动检定。试验结果表明:系统不仅性能可靠、操作方便,通用性较高,明显提高了检定效率,而且避免了手动检定时的人为影响因素,保证了检定数据可靠性。  相似文献   

基于GPS/MIMU组合导航定位系统的研究与应用     

龚真春  郭群长  李平  宋执环 《海洋测绘》2006,26(3):45-47,51

研究了利用微型惯性测量单元M IMU和GPS-OEM板,设计了一种低成本、轻小型的GPS/M IMU组合导航定位系统。为了验证该系统的性能,利用M IMU和GPS观测数据对该组合系统进行了实验。实验结果和应用表明,组合导航系统在精度和可靠性方面较单一的导航系统都有明显的改善。  相似文献   

用于测量海水温度和压力光纤传感器     

王晶  王项南 《海洋技术学报》2006,25(2):21-22,72

文章从理论上分析了布里渊散射光的频移和强度与海水温度和应力的关系,针对分布式布里渊散射光纤传感器测量海水温度和压力的测量原理进行了论述,对该测量系统的构成以及测量的实现进行了探讨。  相似文献   

MUSIC算法在矢量水听器阵中的应用研究     

王绪虎  田坦 《海洋技术学报》2006,25(3):82-85

文中推导了阵元为矢量水听器时的MU S IC算法。对直线阵情况进行了计算机仿真,结果表明,矢量阵MU-S IC算法与声压阵相比具有更高的方位分辨力。  相似文献   

应用于自适应系统的1.2m望远镜面形误差精细检测     

张琛 《天文研究与技术》1999,(1)

为检测云南天文台１．２ｍ望远镜光学成像质量,在多种光学检测方法中,我们结合实际情况,详细地讨论了两种方案的可能性。并用美国ＺＥＭＡＸ光学设计软件设计了所需的光学辅助元件。第一种方案,将全口径分割成直径为３００ｍｍ的子孔径后,利用哈特曼传感器对每个子孔径的最后成像波面进行探测,得到波前畸变量。最后将所得到的子孔径波面合成得到全口径波面,进而分析系统成像质量。第二种方案采用补偿干涉法,利用设计的补偿器补偿主镜的法线象差,得到干涉条纹,再由干涉条纹分析得到主镜面形差。这两种方法都实现微机实时采样与处理,能以较快速度计算出最后结果。最后,我们讨论了检测过程中误差来源及精度分析。在实验条件满足的情况下,整个系统的测试精度优于λ／１０。  相似文献   

介绍一种测量溶解氧的微型光纤传感器   总被引：2，自引：0，他引：2  

褚柳宁 《海洋技术学报》1999,18(2):49-55

本文介绍了一种根据动态荧光猝灭原理而设计的微型光纤溶解氧传感器（氧微光极）,讨论了氧微光极的结构设计、工作原理、技术特点及试验应用情况。该系统具有良好的测量特性,是适合于水环境应用的理想工具  相似文献   

LGY-Ⅲ型智能测沙颗分仪   总被引：10，自引：0，他引：10  

蔡守允  魏延文  雷学锋 《海洋工程》1999,17(4)

介绍了应用于多项国家重点科技攻关项目——泥沙河工模型试验的ＬＧＹ－Ⅲ型智能测沙颗分仪的工作原理和应用方法。  相似文献   

Responses to Users: The Continuing Evolution of Commercial Digital Photogrammetry   总被引：1，自引：0，他引：1  

A. S. Walker 《The Photogrammetric Record》1999,16(93):469-483

Although well established, digital photogrammetry continues to change. More sources offer imagery which can be treated photogrammetrically. Users need improved scanner performance as they attempt to offset costs by feeding clusters of workstations or establishing bureau services; increased speed, variable pixel size, use of roll film and "on the fly" dodging are desirable scanner characteristics. On the workstation side, the demand for the Windows NT platform has been irresistible. New applications and the quest for higher productivity have resulted in demands including output of orientation data to analytical plotters, processing of data from airborne GPS and inertial measurement unit (IMU), triangulated irregular network (TIN) DTMs, automated radiometric balancing in mosaicking, smoother operation within feature collection and batch processes. Moreover, the market place itself changes, with suppliers, their customers and the end users all competing for position.  相似文献   

海洋水色CCD成像仪光谱非线性校正   总被引：1，自引：0，他引：1  

郑玉权  崔敦杰 《遥感学报》1999,3(2):107-111

个理想的光学遥感器,在响应波段内光谱响应度是完全平直的,遥感器的输出与入射的辐射成完全的线性关系;而实际的遥感器并非如此,它的光谱响应度在响应波段内并不是平直的,这就使遥感器的输出不仅与入射的辐射有关,还与遥感器的光谱响应度有关,实际测量时,由于目标光谱形状的差异会导致输入与输出之间的非线性关系。利用仪器定标时采用的光源光谱形状与实际测量时目标光谱形状对仪器的输出数据进行校正会有效地减小由于遥感器的光谱响应非均匀性引入的测量误差。文中利用测得的海洋水色ＣＣＤ成像仪的各波段光谱响应度,计算了已归一化为具有相同的带内平均光谱辐亮度的不同温度黑体输出,由输出结果可以看到,不同的光谱形状对海洋水色ＣＣＤ成像仪的输出影响较大,为了减小由此引入的测量误差,文中对实验室定标用积分球光源和海洋水色ＣＣＤ成像仪在轨工作时的典型输入辐亮度的光谱特性进行了等效黑体拟合,并以此为依据计算了海洋水色ＣＣＤ成像仪在轨工作时的光谱非线性修正因子。  相似文献