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基于边界表示的拔模算法及其应用 被引量:1
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作者 严冬明 张慧 +1 位作者 雍俊海 孙家广 《工程图学学报》 CSCD 2004年第4期31-35,共5页
拔模操作是三维几何造型系统中给实体创建倾斜面特征的有效方法。笔者以商业造型软件 TiGems 为平台,提出了一个基于边界表示的拔模算法。针对现有拔模算法的不足,改进了拔模操作中边的计算方法,提高了算法的效率;增加了判断并消除形体... 拔模操作是三维几何造型系统中给实体创建倾斜面特征的有效方法。笔者以商业造型软件 TiGems 为平台,提出了一个基于边界表示的拔模算法。针对现有拔模算法的不足,改进了拔模操作中边的计算方法,提高了算法的效率;增加了判断并消除形体自交的功能,提高了算法的鲁棒性。笔者将本文的算法应用到草图的倾斜拉伸操作中,取得了不错的效果。 展开更多
关键词 计算机应用 拔模 面环操作 实体造型
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Wedge Operations and Doubling Operations of Real Toric Manifolds
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作者 Hanchul PARK 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2017年第6期1321-1334,共14页
This paper deals with two things. First, the cohomology of canonical extensions of real topological toric manifolds is computed when coefficient ring G is a commutative ring in which 2 is unit in G. Second, the author... This paper deals with two things. First, the cohomology of canonical extensions of real topological toric manifolds is computed when coefficient ring G is a commutative ring in which 2 is unit in G. Second, the author focuses on a specific canonical extensions called doublings and presents their various properties. They include existence of infinitely many real topological toric manifolds admitting complex structures, and a way to construct infinitely many real toric manifolds which have an odd torsion in their cohomology groups.Moreover, some questions about real topological toric manifolds related to Halperin's toral rank conjecture are presented. 展开更多
关键词 Real toric manifold Small cover Real topological toric manifold Coho-mology ring Doubling Simplicial wedge Rational homology sphere
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