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邻域平衡密度聚类算法 被引量:22
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作者 武佳薇 李雄飞 +1 位作者 孙涛 李巍 《计算机研究与发展》 EI CSCD 北大核心 2010年第6期1044-1052,共9页
聚类是数据挖掘领域的一项重要分析手段.在分析核心对象与其邻域对象的分布特征后,引入对象的投影点,对象的邻域平衡、平衡核心对象、边界稀疏对象等概念.提出一种新的基于密度的聚类算法bDBSCAN(balance-DBSCAN).算法将核心对象邻域中... 聚类是数据挖掘领域的一项重要分析手段.在分析核心对象与其邻域对象的分布特征后,引入对象的投影点,对象的邻域平衡、平衡核心对象、边界稀疏对象等概念.提出一种新的基于密度的聚类算法bDBSCAN(balance-DBSCAN).算法将核心对象邻域中的对象投影,进行向量单位化,考察核心对象的邻域平衡性,将与平衡核心对象平衡密度可达的对象聚成一个簇.理论分析和实验结果表明,算法可以处理任意形状的簇,有效地排除边界稀疏对象这类噪声,并且可以解决高维数据聚类边界区分不明显、噪声对象多等问题,提高了聚类精度.算法的时间复杂度与DBSCAN近似. 展开更多
关键词 投影点 邻域平衡 平衡核心对象 边界稀疏对象 基于密度的聚类算法
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A Research on Particle-Based Parallel Methods for Fluid Animation
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作者 Fengquan Zhang Junli Qin 《Journal of Mathematics and System Science》 2015年第6期225-231,共7页
In this paper, we present an acceleration strategy for Smoothed Particle Hydrodynamics (SPH) on multi-GPU platform. For single-GPU, we first use a neighborhood search algorithm of compacting cell index combined with... In this paper, we present an acceleration strategy for Smoothed Particle Hydrodynamics (SPH) on multi-GPU platform. For single-GPU, we first use a neighborhood search algorithm of compacting cell index combined with spatial domain characteristics For multi-GPU, we focus on the changing patterns of SPH's computational time. Simple dynamic load balancing algorithm works well because the computational time of each time step changes slowly compared to previous time step. By further optimizing dynamic load balancing algorithm and the communication strategy among GPUs, a nearly linear speedup is achieved in different scenarios with a scale of millions particles. The quality and efficiency of our methods are demonstrated using multiple scenes with different particle numbers. 展开更多
关键词 CFD Particle-based FLUID GPU
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Fuzzifying Topological Linear Spaces Based on Continuous-Valued logic 被引量:9
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作者 张广济 邹开其 张成 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2006年第1期77-88,共12页
In this paper, we introduce the concept of fuzzifying topological linear space and discuss the structures and properties of the balanced neighborhood system of zero element. We also give the algebraic properties and t... In this paper, we introduce the concept of fuzzifying topological linear space and discuss the structures and properties of the balanced neighborhood system of zero element. We also give the algebraic properties and the topological properties of fuzzifying convex set in the fuzzifying topological linear space. 展开更多
关键词 continuous-valued logic fuzzifying topological linear spaces balanced set zero element neighborhood system convex set.
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