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青杨脊虎天牛风险评估 被引量:13
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作者 周茂建 杜文胜 +1 位作者 李跃 李永诚 《植物检疫》 2006年第3期165-167,共3页
青杨脊虎天牛是一种危害杨树、柳树等多种阔叶树的蛀干性害虫,在我国东北局部地区造成了严重的危害。通过适生性分析和风险评估认为该虫属于中度危险的林业有害生物,对我国北方地区的杨树生态林、速生丰产林构成较大的威胁,建议对该虫... 青杨脊虎天牛是一种危害杨树、柳树等多种阔叶树的蛀干性害虫,在我国东北局部地区造成了严重的危害。通过适生性分析和风险评估认为该虫属于中度危险的林业有害生物,对我国北方地区的杨树生态林、速生丰产林构成较大的威胁,建议对该虫加强检疫管理。 展开更多
关键词 青杨脊虎天牛 风检评估
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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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