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logical parent
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     On Logical Characteristic of Induction
     论归纳的逻辑特征
     Reflection On Logical Argumentation
     二十世纪五六十年代逻辑论争的反思
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     Compared with that of the parent strain K.
     与出发菌株K.
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     The parent-child relationship of J.
     J.
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Microsoft′s OLAP (On Line Analytical Processing) system can deal effectively with ragged dimensions. But many existing OLAP systems can not; if they must be reconstructed to remove this defect, the cost is high. We propose a simple and economical remedy to enable existing OLAP systems to deal effectively with ragged dimensions. This paper focuses on ragged dimensions in multi dimensional data model (MDDM) for OLAP. Logical parents of some members of a ragged dimension are located two or more levels above...

Microsoft′s OLAP (On Line Analytical Processing) system can deal effectively with ragged dimensions. But many existing OLAP systems can not; if they must be reconstructed to remove this defect, the cost is high. We propose a simple and economical remedy to enable existing OLAP systems to deal effectively with ragged dimensions. This paper focuses on ragged dimensions in multi dimensional data model (MDDM) for OLAP. Logical parents of some members of a ragged dimension are located two or more levels above these members. In other words, there exist empty holes in dimension hierarchy and, as a result, aggregation of measure data computed directly from lower levels may be incorrect. Section 3 explains in some detail how to extend the traditional MDDM by representing a ragged dimension as a special kind of conventional dimension. On the basis of this special kind of conventional dimension, section 4 explains how to add a query processing level to existing OLAP system. This query processing level is a simple and economical remedy which can enable an existing OLAP system to deal effectively with ragged dimensions.

维是面向 OLAP应用的多维数据模型的必要组成部分。维模式是等级的集合 ,不同的等级使用户可以对不同粒度的度量数据进行观察。文中的研究对象是一类特殊结构的维 ,其中某些子成员的父成员不在其直接的上一个等级之中 ,相当于维层次结构中出现漏洞 ,当度量聚集到带有漏洞的等级时 ,很可能导致错误的计算结果 ,从而引发错误的决策。通过在传统的多维数据模型之上增加一个查询处理层 ,以保证多维操作语义的正确性及对查询优化的支持。现有的 OLAP系统使用这种方式可以很容易地实现对漏洞维的支持

Objective:To investigate association of the new polymorphism G352A in the dopaminetransporter gene(DAT1)exon 15 with attention deficit hyperactivity disorder(ADHD)in Han Chinesechildren.Methods:The new mutant polymorphism G352A in the dopamine transporter gene(DAT1)ex-on 15 was found by the fluorescently-labeled dye-terminators assay.The study samples were comprised of337 ADHD children,207 unrelated controls and 201 integrated ADHD trios(included proband and bio-logical parents).Associations of polymorphisms...

Objective:To investigate association of the new polymorphism G352A in the dopaminetransporter gene(DAT1)exon 15 with attention deficit hyperactivity disorder(ADHD)in Han Chinesechildren.Methods:The new mutant polymorphism G352A in the dopamine transporter gene(DAT1)ex-on 15 was found by the fluorescently-labeled dye-terminators assay.The study samples were comprised of337 ADHD children,207 unrelated controls and 201 integrated ADHD trios(included proband and bio-logical parents).Associations of polymorphisms with ADHD and its subtypes were examined by:(i)comparing cases and controls;and(ii)using family-based association study in transmission-disequilibri-um test(TDT).Results:The allele frequencies at the DAT1 G352A locus in the control samples were79.5% for 352G and 20.5% for 352A respectively.Association studies revealed no association betweenG352A in exon 15 of DAT1 and ADHD.But after a stratification by gender,there was possible associationbetween G352A and ADHD girls:the 352G allele had a tendency to be preferentially transmitted toADHD girls.Conclusion:There is no association between G352A,the new polymorphism,in exon 15 ofDAT1 and ADHD.The 352G allele has a tendency to be preferentially transmitted to ADHD girls,but thefindings require replication before drawing a definitive conclusion.

目的:探讨中国汉族人群中注意缺陷多动障碍(attention deficit hyperactivity disorder,ADHD)与多巴胺转运体蛋白基因(DAT1)第15外显子 G352A 多态性的关系。方法:应用彩色荧光标记序列分析方法寻找突变位点,检测337个 ADHD 患儿,201个 ADHD 核心家系和207个对照 DAT1的新基因位点 G352A 的多态性,并进行传递不平衡检验(transmission disequilibrium test,TDT)和病例对照的关联分析。结果:所测对照人群中 DAT1的 G352A 的等位基因频率,352G 是79.5%,352A 是20.5%。家系和病例对照研究表明,DAT1第15外显子 G352A 基因和ADHD 之间不存在关联。但是按照性别分组后,TDT 结果表明,G352A 基因和 ADHD 女孩可能存在关联,即352G等位基因在 ADHD 女孩中有优先传递的趋势。结论:DAT1第15外显子上的新基因位点 G352A 和 ADHD 之间不存在关联。352G 等位基因在 ADHD 女孩中有优先传递的趋势,但尚需要扩大样本进一步验证才能得出确切结论。

 
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