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126 条记录 (耗时 0.026 秒)

    Method for Discovering Undeclared and Fuzzy Rules in Databases
    81.
    发明申请
    Method for Discovering Undeclared and Fuzzy Rules in Databases 失效
    发现数据库中未声明和模糊规则的方法

    公开(公告)号：US20080027907A1

    公开(公告)日：2008-01-31

    申请号：US11842828

    申请日：2007-08-21

    申请人： Paul Brown ,  Peter Haas

    发明人： Paul Brown ,  Peter Haas

    IPC分类号： G06F7/00

    CPC分类号： G06N5/048 ,  G06F17/30539

    摘要： A scheme is used to automatically discover algebraic constraints between pairs of columns in relational data. The constraints may be “fuzzy” in that they hold for most, but not all, of the records, and the columns may be in the same table or different tables. The scheme first identifies candidate sets of column value pairs that are likely to satisfy an algebraic constraint. For each candidate, the scheme constructs algebraic constraints by applying statistical histogramming, segmentation, or clustering techniques to samples of column values. In query-optimization mode, the scheme automatically partitions the data into normal and exception records. During subsequent query processing, queries can be modified to incorporate the constraints; the optimizer uses the constraints to identify new, more efficient access paths. The results are then combined with the results of executing the original query against the (small) set of exception records.

    摘要翻译： 一种方案用于自动发现关系数据中的列对之间的代数约束。 约束可能是“模糊的”，因为它们对大多数但不是全部的记录持有，并且列可以在同一个表或不同的表中。 该方案首先识别可能满足代数约束的列值对的候选集合。 对于每个候选者，该方案通过将统计直方图，分段或聚类技术应用于列值样本来构建代数约束。 在查询优化模式下，该方案自动将数据分割为正常和异常记录。 在随后的查询处理期间，可以修改查询以并入约束; 优化器使用约束来识别新的更有效的访问路径。 然后将结果与针对（小）异常记录集执行原始查询的结果相结合。

    Method for estimating the cost of query processing
    83.
    发明申请
    Method for estimating the cost of query processing 失效
    估算查询处理成本的方法

    公开(公告)号：US20070043696A1

    公开(公告)日：2007-02-22

    申请号：US11206978

    申请日：2005-08-19

    申请人： Peter Haas ,  Vanja Josifovski ,  Guy Lohman ,  Chun Zhang

    发明人： Peter Haas ,  Vanja Josifovski ,  Guy Lohman ,  Chun Zhang

    IPC分类号： G06F17/30

    CPC分类号： G06F17/30935 ,  Y10S707/99932 ,  Y10S707/99934 ,  Y10S707/99935 ,  Y10S707/99945 ,  Y10S707/99948

    摘要： Provided is a method for modeling the cost of XML as well as relational operators. As with traditional relational cost estimation, a set of system catalog statistics that summarizes the XML data is exploited; however, the novel use of a set of simple path statistics is also proposed. A new statistical learning technique called transform regression is utilized instead of detailed analytical models to predict the overall cost of an operator. Additionally, a query optimizer in a database is enabled to be self-tuning, automatically adapting to changes over time in the query workload and in the system environment.

    摘要翻译： 提供了一种用于建模XML成本以及关系运算符的方法。 与传统的关系成本估算一样，利用了一套总结XML数据的系统目录统计数据; 然而，还提出了一组简单路径统计学的新颖使用。 使用称为变换回归的新的统计学习技术，而不是详细的分析模型来预测运营商的整体成本。 另外，数据库中的查询优化器可以自我调整，自动适应查询工作负载和系统环境中随时间的变化。

    Reinforced polyurethane-urea elastomers and their use
    84.
    发明申请
    Reinforced polyurethane-urea elastomers and their use 失效
    增强聚氨酯 - 尿素弹性体及其用途

    公开(公告)号：US20060142462A1

    公开(公告)日：2006-06-29

    申请号：US11311056

    申请日：2005-12-19

    申请人： Peter Haas ,  Hans-Detlef Arntz

    发明人： Peter Haas ,  Hans-Detlef Arntz

    IPC分类号： C08K3/34

    CPC分类号： C08G18/4837 ,  C08G18/10 ,  C08G2120/00 ,  C08G18/6685

    摘要： The invention relates to reinforced polyurethane-urea elastomers with a specific urea content and a specific urethane content, to sheet polyurethane moldings with high surface energy and good lacquer adhesion produced therefrom, and to their use.

    摘要翻译： 本发明涉及具有特定尿素含量和特定氨基甲酸酯含量的增强聚氨酯 - 尿素弹性体，具有高表面能和由其产生的良好的漆粘合性的片状聚氨酯模制品及其用途。

    Process for the preparation of polyurethane elastomers with a high heat distortion temperature
    88.
    发明授权
    Process for the preparation of polyurethane elastomers with a high heat distortion temperature 有权
    具有高热变形温度的聚氨酯弹性体的制备方法

    公开(公告)号：US06566482B2

    公开(公告)日：2003-05-20

    申请号：US10014050

    申请日：2001-12-11

    申请人： Peter Haas ,  Hans-Detlef Arntz

    发明人： Peter Haas ,  Hans-Detlef Arntz

    IPC分类号： C08G1810

    CPC分类号： C08G18/797 ,  C08G18/10 ,  C08G18/4841 ,  C08G18/6674

    摘要： Polyurethane elastomers are produced by reacting a polyether and/or polyester polyol having a starter functionality of at least 2 with an NCO-terminated prepolymer produced with a polyether and/or polyester polyol having a starter functionality of at least 4. These polyurethane elastomers exhibit improved processing characteristics combined with a high heat distortion temperature.

    摘要翻译： 聚氨酯弹性体通过使具有至少2起始官能度的聚醚和/或聚酯多元醇与起始官能度为至少为4的聚醚和/或聚酯多元醇制备的NCO封端的预聚物反应制备。这些聚氨酯弹性体显示出改进的 加工特性结合高热变形温度。

    Flexible polyurethane foams and a process for the production thereof
    90.
    发明授权
    Flexible polyurethane foams and a process for the production thereof 失效
    柔性聚氨酯泡沫及其生产方法

    公开(公告)号：US5863961A

    公开(公告)日：1999-01-26

    申请号：US095201

    申请日：1998-06-10

    申请人： Gundolf Jacobs ,  Peter Haas

    发明人： Gundolf Jacobs ,  Peter Haas

    IPC分类号： C08J9/02 ,  C08G18/10 ,  C08G18/48 ,  C08G18/76 ,  C08G101/00 ,  C08G18/32

    CPC分类号： C08G18/4812 ,  C08G2101/0008 ,  C08G2101/005 ,  C08G2101/0083 ,  Y10S521/914

    摘要： Process for the production of flexible polyurethane foams by reactingA) polyisocyanates or polyisocyanate prepolymers, withB) a specific blend of isocyanate-reactive compounds,C) water,D) optionally, blowing agents,E) optionally, activators, stabilizers and other per se known additives.The specific blend of isocyanate-reactive compounds B) comprises:i) at least one polyether polyol of a functionality of more than 2.5 to 6.0,ii) at least one polyether polyol of a functionality of 1.8 to less than 2.5,iii) at least one polyether polyol of a functionality of 1.8 to 6.0 having an EO content in the polyether chain of at least 50 wt. %.The flexible foams produced according to the present invention are characterized by moderate compressive strength at an elevated bulk density.

    摘要翻译： 通过使A）多异氰酸酯或多异氰酸酯预聚物与B）异氰酸酯反应性化合物的特定混合物，C）水，D）任选的发泡剂，E）任选的活化剂，稳定剂和其它 已知添加剂。 异氰酸酯反应性化合物B）的具体混合物包括：i）至少一种官能度大于2.5至6.0的聚醚多元醇，ii）至少一种官能度为1.8至小于2.5的聚醚多元醇，iii）至少 一种官能度为1.8至6.0的聚醚多元醇，其聚醚链中的EO含量至少为50wt。 ％。 根据本发明生产的柔性泡沫的特征在于体积密度升高时的适度的抗压强度。