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快速构建目录树的算法研究 总被引:1,自引:0,他引:1
通常使用DFA和ITA算法构造目录树,分别对这两种算法进行了时间复杂性分析,16组实验结果表明DFA算法快于ITA算法. 相似文献
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韩卫 《南京邮电大学学报(自然科学版)》2009,9(20)
通常使用DFA和ITA算法构造目录树,本文分别对这两种算法进行了时间复杂性分析,16组实验结果表明DFA算法快于ITA算法。 相似文献
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MEI HanWei FENG FangJun LU BaoRong WEN WeiWei Andrew H. PATERSON CAI XingXing CHEN Liang Frank A. FELTUS XU XiaoYan WU JingHong YU XinQiao CHEN HongWei LI Ying LUO LiJun 《科学通报(英文版)》2007,52(10):1327-1337
The pedigrees of three sequenced rice cultivars were analyzed to show that a majority of the genetic composition of 'Nipponbare' originates from japonica cultivars while the minority originates from indica cultivars. In contrast, '93-11' is derived mainly from indica cultivars with a smaller contribution from japonica cultivars. All ancestors of 'Guang lu ai 4' appeared to be indica lines. A set of molecular markers (46 InDels and 53 SSRs) polymorphic between 'Nipponbare' and '93-11' were examined in 46 typical indica and 47 typical japonica cultivars selected from 443 accessions according to Cheng's index. All cultivars were divided into indica and japonica groups without overlapping when clustered by Cheng's index, InDels and SSRs. Much higher InDel and SSR diversity between groups than within groups implies that the marker polymorphisms between 'Nipponbare' and '93-11' represent a large proportion of inter-subspecific diversity. About 85% of indica cultivars and more than 90% of japonica cultivars were confirmed to have the same PCR banding patterns as '93-11' and 'Nipponbare', respectively. Some polymorphic loci between 'Nipponbare' and '93-11' cannot be validated in other indica and japonica cultivars, either as subspecies-specific but not predominant alleles, or alleles not specific between the two groups. It was concluded that molecular markers developed from sequence polymorphism between 'Nipponbare' and '93-11' often represent inter-subspecific diversity, although some exceptions were sensitive to either particular marker loci or particular cultivars. 相似文献
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基于经典的弹性地球自转动力学理论,通过引入章动参考系相对惯性空间的运动,建立了弹性地球极移和章动的联合动力学方程。由此对 CIP 轴进行了理论定义,并给出了其极移、岁差章动的动力学方程。在顾及到 5 阶引潮力矩的情况下,给出了 CIP 轴的岁差章动的解析表达式。理论研究表明,奇数阶岁差章动力矩使得黄经章动和交角章动出现了异向项(即黄经章动出现了 cos 项,交角章动出现了 sin 项),同时也证明了岁差表达式与地球模型无关。得出的理论可为动力大地测量学和天文地球动力学的研究提供理论参考和依据。 相似文献
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