为降低DBSCAN算法的运行时间,结合MCMC(Markov chain Monte Carlo,马尔可夫链蒙特卡洛)采样方法对DBSCAN进行改进,提出一种聚类算法,称为DBSCAN++。其基本思想是优先扩展拓展能力较强的核心对象。通过实验将DBSCAN++与DBSCAN和OPTICS进...为降低DBSCAN算法的运行时间,结合MCMC(Markov chain Monte Carlo,马尔可夫链蒙特卡洛)采样方法对DBSCAN进行改进,提出一种聚类算法,称为DBSCAN++。其基本思想是优先扩展拓展能力较强的核心对象。通过实验将DBSCAN++与DBSCAN和OPTICS进行对比,实验结果表明,从算法运行时间看,DBSCAN++比DBSCAN平均降低了60.7%,比OPTICS平均降低了70.2%;从聚类准确性角度看,DBSCAN++与DBSCAN和OPTICS相当。在没有影响聚类准确性的情况下,DBSCAN++具有更低的运行时间,是一种有效的聚类算法。展开更多
国内外学者对英汉存在句的研究历时已久,成果颇丰,但对扩展成分的研究不甚详细。概述简单存在句和复杂存在句的含义和结构特征,结合具体的语句,从兼语式“有”字句、英语存在句及其对比探究英汉存在句X段的殊同。分析得出,英语存在句与...国内外学者对英汉存在句的研究历时已久,成果颇丰,但对扩展成分的研究不甚详细。概述简单存在句和复杂存在句的含义和结构特征,结合具体的语句,从兼语式“有”字句、英语存在句及其对比探究英汉存在句X段的殊同。分析得出,英语存在句与汉语兼语式“有”字句虽同也殊。“同”体现在构件、扩展部分位置、后段的特点、there be 与“有”的对等性等方面;“殊”包括前三段的位置、句型、扩展部分的句法功能、扩展部分的语法单位和处所/时间短语的句法功能等。指出了解并注意there-存在句和兼语式“有”字句之间的差异以及there-存在句与核心句之间的转换与回归,有利于克服负迁移。展开更多
Taking the Konopelchenko-Dubrovsky system as a simple example, some familles of rational formal hyperbolic function solutions, rational formal triangular periodic solutions, and rational solutions are constructed by u...Taking the Konopelchenko-Dubrovsky system as a simple example, some familles of rational formal hyperbolic function solutions, rational formal triangular periodic solutions, and rational solutions are constructed by using the extended Riccati equation rational expansion method presented by us. The method can also be applied to solve more nonlinear partial differential equation or equations.展开更多
Green design horizon, explore the hand-painted rendering performance techniques,from conception to take as, composition distribution, global and local processing, local expansion method, the performance of rendering a...Green design horizon, explore the hand-painted rendering performance techniques,from conception to take as, composition distribution, global and local processing, local expansion method, the performance of rendering and other aspects of analysis and propose countermeasures. Accumulation of professional material for designers and nutrients at the same time, raise awareness of the environment, space and natural understanding, To improve the aesthetic horizon, hand-painted rendering green design and students ability to innovate education is of great significance.展开更多
This paper gives a unified approach to Hsu's two classes of extended GSN pairs in the setting of Hsu-Riordan partial monoid which is a generalization of Shapiro's Riordan group, and moreover Hsu-Wang transfer ...This paper gives a unified approach to Hsu's two classes of extended GSN pairs in the setting of Hsu-Riordan partial monoid which is a generalization of Shapiro's Riordan group, and moreover Hsu-Wang transfer theorem, Drown-Sprugnoli transfer formula and generalized Brown transfer lemma which display some transfer methods of different kinds of Hsu-Riordau arrays and identities respectively.展开更多
文摘为降低DBSCAN算法的运行时间,结合MCMC(Markov chain Monte Carlo,马尔可夫链蒙特卡洛)采样方法对DBSCAN进行改进,提出一种聚类算法,称为DBSCAN++。其基本思想是优先扩展拓展能力较强的核心对象。通过实验将DBSCAN++与DBSCAN和OPTICS进行对比,实验结果表明,从算法运行时间看,DBSCAN++比DBSCAN平均降低了60.7%,比OPTICS平均降低了70.2%;从聚类准确性角度看,DBSCAN++与DBSCAN和OPTICS相当。在没有影响聚类准确性的情况下,DBSCAN++具有更低的运行时间,是一种有效的聚类算法。
文摘国内外学者对英汉存在句的研究历时已久,成果颇丰,但对扩展成分的研究不甚详细。概述简单存在句和复杂存在句的含义和结构特征,结合具体的语句,从兼语式“有”字句、英语存在句及其对比探究英汉存在句X段的殊同。分析得出,英语存在句与汉语兼语式“有”字句虽同也殊。“同”体现在构件、扩展部分位置、后段的特点、there be 与“有”的对等性等方面;“殊”包括前三段的位置、句型、扩展部分的句法功能、扩展部分的语法单位和处所/时间短语的句法功能等。指出了解并注意there-存在句和兼语式“有”字句之间的差异以及there-存在句与核心句之间的转换与回归,有利于克服负迁移。
基金The project partially supported by the State Key Basic Research Program of China under Grant No. 2004CB318000
文摘Taking the Konopelchenko-Dubrovsky system as a simple example, some familles of rational formal hyperbolic function solutions, rational formal triangular periodic solutions, and rational solutions are constructed by using the extended Riccati equation rational expansion method presented by us. The method can also be applied to solve more nonlinear partial differential equation or equations.
文摘Green design horizon, explore the hand-painted rendering performance techniques,from conception to take as, composition distribution, global and local processing, local expansion method, the performance of rendering and other aspects of analysis and propose countermeasures. Accumulation of professional material for designers and nutrients at the same time, raise awareness of the environment, space and natural understanding, To improve the aesthetic horizon, hand-painted rendering green design and students ability to innovate education is of great significance.
文摘This paper gives a unified approach to Hsu's two classes of extended GSN pairs in the setting of Hsu-Riordan partial monoid which is a generalization of Shapiro's Riordan group, and moreover Hsu-Wang transfer theorem, Drown-Sprugnoli transfer formula and generalized Brown transfer lemma which display some transfer methods of different kinds of Hsu-Riordau arrays and identities respectively.
