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客票收入相关因素的分析及理论最大值的求解 被引量:4
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作者 陈曦 《城市轨道交通研究》 2001年第3期30-33,42,共5页
分析了轨道交通运输企业客票收入实际情况,探讨建立数学模型来讨论客票收入R、票价P与客流量Q之间的关系;并以此为基础,求解一定条件下客票收入理论最大值的方法。
关键词 客票收入 城市轨道交通运输企业 理论最大值 数学模型 票价 客流量 旅客运输 相关因素
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Statistical Analysis for the Birnbaum-Saunders Fatigue Life Distribution under Multiply Type-ⅡCensoring 被引量:5
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作者 WANG Rong-hua FEI He-liang 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2006年第1期15-27,共13页
In present paper, we derive the quasi-least squares estimation(QLSE) and approximate maximum likelihood estimation(AMLE) for the Birnbaum-Saunders fatigue life distribution under multiply Type-Ⅱcensoring. Furthermore... In present paper, we derive the quasi-least squares estimation(QLSE) and approximate maximum likelihood estimation(AMLE) for the Birnbaum-Saunders fatigue life distribution under multiply Type-Ⅱcensoring. Furthermore, we get the variance and covariance of the approximate maximum likelihood estimation. 展开更多
关键词 Birnbaum-Saunders fatigue life distribution multiply Type-Ⅱ censoring quasi-least squares estimation approximate maximum likelihood estimation
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Optimal multilevel thresholding based on molecular kinetic theory optimization algorithm and line intercept histogram 被引量:3
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作者 范朝冬 任柯 +1 位作者 张英杰 易灵芝 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第4期880-890,共11页
Among all segmentation techniques, Otsu thresholding method is widely used. Line intercept histogram based Otsu thresholding method(LIH Otsu method) can be more resistant to Gaussian noise, highly efficient in computi... Among all segmentation techniques, Otsu thresholding method is widely used. Line intercept histogram based Otsu thresholding method(LIH Otsu method) can be more resistant to Gaussian noise, highly efficient in computing time, and can be easily extended to multilevel thresholding. But when images contain salt-and-pepper noise, LIH Otsu method performs poorly. An improved LIH Otsu method(ILIH Otsu method) is presented, which can be more resistant to Gaussian noise and salt-and-pepper noise. Moreover, it can be easily extended to multilevel thresholding. In order to improve the efficiency, the optimization algorithm based on the kinetic-molecular theory(KMTOA) is used to determine the optimal thresholds. The experimental results show that ILIH Otsu method has stronger anti-noise ability than two-dimensional Otsu thresholding method(2-D Otsu method), LIH Otsu method, K-means clustering algorithm and fuzzy clustering algorithm. 展开更多
关键词 image segmentation multilevel thresholding Otsu thresholding method kinetic-molecular theory (KMTOA) line intercept histogram
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