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金沙江流域云南段地震灾害人口风险性分布多维度识别办法 被引量:1
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作者 严佩升 《灾害学》 CSCD 北大核心 2021年第4期96-100,共5页
研究金沙江流域云南段地震灾害人口风险性分布多维度识别办法,提升该地区地震发生时救援能力以及应灾、防灾、救灾能力。通过定量确定人口风险性分布多维度识别的风险性影响因子,其中人口易损系数着重探讨人口分布、人口老幼比例、人口... 研究金沙江流域云南段地震灾害人口风险性分布多维度识别办法,提升该地区地震发生时救援能力以及应灾、防灾、救灾能力。通过定量确定人口风险性分布多维度识别的风险性影响因子,其中人口易损系数着重探讨人口分布、人口老幼比例、人口迁移,获得地震灾区人口分布规律,确保该风险因子足够精准。赋权各风险因子构建风险性识别模型,使用空间叠加分析功能,获得地震人口风险分布结果。运用ArcMap软件,计算地震灾害中包含的人口因素,构建研究区域发生地震时的人口风险性分布图,在图中将人口高风险分布区划分出来,以便该地区有关部门使用该办法应对可能发生的地震灾害。 展开更多
关键词 金沙江 云南段 地震灾害 人口 风险性分布 多维度识别
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Real-time lane departure warning system based on principal component analysis of grayscale distribution and risk evaluation model 被引量:4
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作者 张伟伟 宋晓琳 张桂香 《Journal of Central South University》 SCIE EI CAS 2014年第4期1633-1642,共10页
A technology for unintended lane departure warning was proposed. As crucial information, lane boundaries were detected based on principal component analysis of grayscale distribution in search bars of given number and... A technology for unintended lane departure warning was proposed. As crucial information, lane boundaries were detected based on principal component analysis of grayscale distribution in search bars of given number and then each search bar was tracked using Kalman filter between frames. The lane detection performance was evaluated and demonstrated in ways of receiver operating characteristic, dice similarity coefficient and real-time performance. For lane departure detection, a lane departure risk evaluation model based on lasting time and frequency was effectively executed on the ARM-based platform. Experimental results indicate that the algorithm generates satisfactory lane detection results under different traffic and lighting conditions, and the proposed warning mechanism sends effective warning signals, avoiding most false warning. 展开更多
关键词 lane departure warning system lane detection lane tracking principal component analysis risk evaluation model ARM-based real-time system
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