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奇圈C_(5)的ℓ-uniform Ramsey数

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闽南师范大学学报（自然科学版） 2024年第3期37卷 124-132页

作者：陈健龙闽南师范大学数学与统计学院福建漳州363000

研究ℓ-uniform Ramsey数R_(k)^(ℓ)(G),得到了R_(2)^(2)(C_(5))=R_(2)(C_(5))=9的结果.即确定了奇圈C_(5)的ℓ-uniform Ramsey数的精确值.

关键词：完全多部图 uniform边着色 ℓ-uniform Ramsey数奇圈

从课程教学到文化教育:北京大学信息素质教育工作的回顾与展望

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大学图书馆学报 2024年第3期42卷 5-15页

作者：陈建龙刘雅琼王盛唐勇北京大学图书馆北京100871

文章分初创时期、共创时期、网创时期、融创时期等四个阶段回顾北京大学百余年来信息素质教育工作的发展历程,总结工作成效、实践经验和基本认识,认为信息素质教育是教育的核心任务之一,是基于信息素质课程教学的文化育人活动,是改善人... 详细信息

文章分初创时期、共创时期、网创时期、融创时期等四个阶段回顾北京大学百余年来信息素质教育工作的发展历程,总结工作成效、实践经验和基本认识,认为信息素质教育是教育的核心任务之一,是基于信息素质课程教学的文化育人活动,是改善人与信息、人与文化等关系的重要途径,并提出高校信息素质教育的时代命题与未来展望。

关键词：信息素质教育文化教育北京大学

The(b,c)-inverse in semigroups and rings with involution

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Frontiers of Mathematics in China 2020年第6期15卷 1089-1104页

作者： Xiaofeng chen jianlong chen School of Mathematics Southeast UniversityNanjing 210096China

We first prove that if a is both left(6,c)-invertible and left(c,b)-invertible,then a is both(6,c)-invertible and(c,6)-invertible in a*-monoid,which generalizes the recent result about the inverse along an element by *** and ***[Linear Multilinear Algebra,***/10.1080/03081087.2019.1679073],under the conditions(a6)*=ab and(ac)*=*** addition,we consider that ba is(c,fe)-invertible,and at the same time ca is(6,c)-invertible under the same conditions,which extend the related results about Moore-Penrose inverses studied by ***,***,***,and ***[Mediterr ***.,2017,14:208]to(6,c)-*** applications,we obtain that under condition(a2)^(*)=a^(2),a is an EP element if and only if a is one-sided core invertible,if and only if a is group invertible.

关键词： (6,c)-inverse inverse along an element core inverse EP element

基于能量函数基元提取的建筑物LOD2模型自动生成方法

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测绘通报 2024年第5期 103-107,114页

作者：王林陈健龙刘照亮刘文轩合肥市测绘设计研究院有限公司安徽合肥230061 合肥市地理信息与智慧城市工程技术研究中心安徽合肥230061 合肥巢湖空间测绘科技有限公司安徽合肥230061 武汉大势智慧科技有限公司湖北武汉430223 自然资源部实景三维建设与城市精细化治理工程技术创新中心湖北武汉430223

近年来,随着实景三维中国和数字中国的快速发展,建筑物三维模型重建已成为智慧城市建设的重要环节。本文提出了一种全自动建筑物LOD2模型生成框架,旨在解决城市级实景三维场景中建筑物LOD2模型生成的难题。为了自动提取大场景建筑物对象... 详细信息

近年来,随着实景三维中国和数字中国的快速发展,建筑物三维模型重建已成为智慧城市建设的重要环节。本文提出了一种全自动建筑物LOD2模型生成框架,旨在解决城市级实景三维场景中建筑物LOD2模型生成的难题。为了自动提取大场景建筑物对象,首先利用场景正射影像,通过图像分割获取建筑物的边界信息;然后使用改进的增强型平面区域分割方法提取高质量的分割平面,并利用混合线性模型对分割结果进行优化,能够更好地处理城市建筑物的局部破损和重建错误等问题。试验结果表明,本文算法生成的建筑物LOD2模型质量和效率更高,能够应对城市建筑模型的复杂情况,得到更稳健的重建结果。

关键词：细节层次模型建筑物重建区域分割自动生成基元提取

Approximations and cotorsion pairs related to a tilting pair

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Frontiers of Mathematics in China 2013年第6期8卷 1367-1376页

作者： Yihua LIAO jianlong chen Department of Mathematics Southeast University Nanjing 210096 China College of Mathematics and Information Science Guangxi University Nanning 530004 China

The notion of a tilting pair Miyashita in 2001. It is a useful tool in cotorsion pairs related to a fixed tilting （covariantly） finite subcategory and a tilting pair were given in this paper. over artin algebras was introduced by the tilting theory. Approximations and pair were discussed. A eontravariantly eotorsion pair associated with a fixed

关键词： Selforthogonal module contravariantly (covariantly) finite subcategory cotorsion pair tilting pair

On Some n-C2 and Strongly C2 Extensions

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Algebra Colloquium 2020年第3期27卷 545-562页

作者： Farid Kourki jianlong chen Wenxi Li Centre Regional des Metiers de「Education et de la Formation(CRMEF)-Tanger Annexe de Larache B.P.4063LaracheMorocco Department of Mathematics Southeast UniversityNanjing 210096China School of Mathematics and Physics Anhui University of Technology Ma^nshanAnhui 243002China

Let R be a ring and n be a positive *** R is called a left n-C2-ring(strongly left C2-ring)if every n-generated(finitely generated)proper right ideal of R has nonzero left *** discuss some n-C2 and strongly C2 extensi... 详细信息

关键词： n-self-associated module self-associated module n-C2-ring strongly C2-ring

New characterizations for core inverses in rings with involution

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Frontiers of Mathematics in China 2017年第1期12卷 231-246页

作者： Sanzhang XU jianlong chen Xiaoxiang ZHANG Department of Mathematics Southeast UniversityNanjing 210096China

The core inverse for a complex matrix was introduced by *** and ***,*** and *** generalized the core inverse of a complex matrix to the case of an element in a *** also proved that the core inverse of an element in a ring can be characterized by five equations and every core invertible element is group *** is natural to ask when a group invertible element is core *** this paper,we will answer this *** R be a ring with involution,we will use three equations to characterize the core inverse of an *** is,let a,b∈*** a∈R with a=b if and only if(ab)^(*)=ab,ba^(2)=a,and ab^(2)=***,we investigate the additive property of two core invertible ***,the formulae of the sum of two core invertible elements are presented.

关键词： Core inverse dual core inverse group inverse {1,3}-inverse inverse{1,4}-inverse

Some ＊-Clean Group Ringst

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Algebra Colloquium 2015年第1期22卷 169-180页

作者： Yanyan Gao jianlong chen Yuanlin Li Department of Mathematics Southeast University Nanjing 210096 China Department of Mathematics and Physics Nanjing Institute of Technology Nanjing 211167 China Department of Mathematics Brock University St. Catharines L2S 3A1 Canada

A ring with involution ＊ is called ＊-clean if each of its elements is the sum of a unit and a projection. It is obvious that ＊-clean rings are clean. Vas asked whether there exists a clean ring with involution that is not ＊-clean. In this paper, we investigate when a group ring RG is ＊-clean, where ＊ is the classical involution on RG. We obtain necessary and sufficient conditions for RG to be ＊-clean, where R is a commutative local ring and G is one of the groups C3,C4, S3 and Q8. As a consequence, we provide many examples of group rings which are clean but not ＊-clean.

关键词： group ring clean ring,*-clean ring

Weighted binary relations involving core-EP inverse

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Frontiers of Mathematics in China 2020年第4期15卷 685-699页

作者： Yuefeng GAO jianlong chen Pedro PATRICIO College of Science University of Shanghai for Science and TechnologyShanghai 200093China School of Mathematics Southeast UniversityNanjing 210096China CMAT-Centro de Matematica Universidade do MinhoBraga 4710-057Portugal

We study a new binary relation defined on the set of rectangular complex matrices involving the weighted core-EP inverse and give its *** relation becomes a ***,one-sided preorders associated to the weighted core-EP i... 详细信息

关键词： Weighted core-EP inverse core-EP inverse pseudo core inverse pre-order