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一种提高N线模型探头标定精度的解算方法 被引量:5
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作者 朱立人 李文骏 +1 位作者 丁辉 王广志 《中国生物医学工程学报》 CAS CSCD 北大核心 2012年第3期337-343,共7页
在超声引导的介入治疗中,为了利用三维定位系统实现对超声成像平面的跟踪,超声探头与定位系统的传感器之间几何关系的标定是影响整体引导精度的重要环节。广泛应用的N线模型和传统最小二乘解算方法在超声探头标定中存在注册点共面性丢... 在超声引导的介入治疗中,为了利用三维定位系统实现对超声成像平面的跟踪,超声探头与定位系统的传感器之间几何关系的标定是影响整体引导精度的重要环节。广泛应用的N线模型和传统最小二乘解算方法在超声探头标定中存在注册点共面性丢失的问题,进而影响标定精度。针对这一问题,提出一种先拟合虚拟成像平面,再进行共面约束下标定的解算方案,以提高利用N线模型进行标定的精度。实际的标定实验结果表明,新的解算方法能够有效地解决共面性丢失带来的精度影响,与传统解算方法相比,标定误差从5.88 mm降低到4.11 mm。 展开更多
关键词 超声引导介入治疗 超声探头标定 N线模型 最小二乘配准
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Least Squares Fitting Based Fault Classification in Distribution Systems 被引量:1
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作者 Omar A. Saraereh Qais Alsafasfeh +2 位作者 Anas Al Tarabsheh Aouda Arfoa Issa Etier 《Journal of Energy and Power Engineering》 2014年第3期560-567,共8页
Power systems are the largest and most complex human made systems, consisting of thousands of electrical sources, loads, transmission and distribution lines, power transformers, circuit breakers, etc. where faults alw... Power systems are the largest and most complex human made systems, consisting of thousands of electrical sources, loads, transmission and distribution lines, power transformers, circuit breakers, etc. where faults always occurred. Faults can cause personnel and equipment safety problems, and can result in significant disruption to power supply and thus financial losses. In this paper we will present comprehensive mathematical suite to detect and classify fault dependent models of various types of power systems. This work will extract fault unique signatures by using polarization ellipse during the healthy condition and the polarization will be circular shape with radius equal the rated voltage of the system, but during the fault condition the polarization will be ellipse shape and the fault signature will be defined according the ellipse parameters major axis, minor axis, ellipticity and orientation angle, by using least squares criterion will define the ellipse parameters this system will identify and classify. This paper will be a milestone for extended paper based on the proposed mathematical modelling and applying it to identify, classify and localize with simulation model. 展开更多
关键词 Distribution systems major axis minor axis ELLIPTICITY FAULT ELLIPSE least squares criterion.
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