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基于最小聚类划分的K-means聚类(1+ε)近似算法 被引量:5
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作者 王守强 朱大铭 史士英 《计算机研究与发展》 EI CSCD 北大核心 2008年第z1期26-30,共5页
k-means聚类算法是解决聚类问题的一个常用方法.近年来,国外许多学者对该问题的近似常数算法和(1+ε)近似算法进行了研究.利用Kumar等人随机取样技术对于基于最小聚类划分k-means提出一个(1+ε)随机近似算法.该算法利用随机取样技术从... k-means聚类算法是解决聚类问题的一个常用方法.近年来,国外许多学者对该问题的近似常数算法和(1+ε)近似算法进行了研究.利用Kumar等人随机取样技术对于基于最小聚类划分k-means提出一个(1+ε)随机近似算法.该算法利用随机取样技术从集合中求出部分取样点,再对随机取样点进行组合找出每个聚类的部分点,将该部分点的质心点作为相应子聚类簇的质心点.通过多次运行该算法可以以较高概率求出k-means聚类的1+ε近似值. 展开更多
关键词 K-MEANS 聚类 质心点 ε质心点
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Some Inequalities for L_p-mixed Affine Surface Area 被引量:1
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作者 朱先阳 《Chinese Quarterly Journal of Mathematics》 CSCD 2012年第4期572-581,共10页
In this paper, the concepts of the ith L;-mixed affine surface area and Lp-polar curvature images are introduced, some new inequalities connecting these new notions with Lρ-centroid bodies and ρ-Blaschke bodies are ... In this paper, the concepts of the ith L;-mixed affine surface area and Lp-polar curvature images are introduced, some new inequalities connecting these new notions with Lρ-centroid bodies and ρ-Blaschke bodies are showed. Moreover, a Blaschke-Santalo type inequality for Lρ-mixed affine surface area is established. Our results also imply the similar to the inequalities for Marcus-Lopes, Bergstrom and Ky Fan. 展开更多
关键词 Lρ-mixed atone surface area Lρ-polar curvature images ρ-Blaschke linearcombination -centroid body
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Busemann-Petty Type Problem for the General L_(p)-Centroid Bodies
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作者 Weidong Wang 《Analysis in Theory and Applications》 CSCD 2023年第1期69-82,共14页
Lutwak showed the Busemann-Petty type problem(also called the Shephard type problem)for the centroid bodies.Grinberg and Zhang gave an affirmation and a negative form of the Busemann-Petty type problem for the L_(p)-c... Lutwak showed the Busemann-Petty type problem(also called the Shephard type problem)for the centroid bodies.Grinberg and Zhang gave an affirmation and a negative form of the Busemann-Petty type problem for the L_(p)-centroid bodies.In this paper,we obtain an affirmation form and two negative forms of the BusemannPetty type problem for the general L_(p)-centroid bodies. 展开更多
关键词 Lp-centroid body general L_(p)-centroid body Busemann-Petty problem affirmation form negation form
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