Patents by Inventor Chengkai Li

Chengkai Li has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for composing XSL transformations with XML publishing views
    Patent number: 9152735
    Abstract: A method and apparatus are provided for composing XSL transformations with XML publishing views. XSL transformations are performed on XML documents defined as views of relational databases. A portion of a relational database can be exported to an XML document. An initial view query defines an XML view on the relational database and an XSLT stylesheet specifies at least one transformation. The initial view query is modified to account for an effect of the transformation and the modified view query is applied to the relational database to obtain the XML document. When the modified view query is evaluated on a relational database instance, the same XML document is obtained as would be obtained by evaluating the XSLT stylesheet on the original XML view.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: October 6, 2015
    Assignee: Alcatel Lucent
    Inventors: Philip L. Bohannon, Henry F. Korth, Chengkai Li, Suranarayan Perinkulam
  • METHOD AND SYSTEM FOR COMBINING RANKING AND CLUSTERING IN A DATABASE MANAGEMENT SYSTEM
    Publication number: 20080270374
    Abstract: A system for combining ranking and clustering in a query. Bit vectors are intersected on Boolean attributes resulting in a vector. Two summary grids are constructed by intersecting bit vectors on clustering and ranking attributes. The vector is intersected with each summary grid to obtain a filtered clustering and ranking grid. An algorithm is applied on the clustering grid to obtain clusters. Vectors associated with buckets in the clusters are intersected resulting in one vector for each cluster. The vector corresponding to each cluster is intersected with the ranking grid to obtain a modified grid. Buckets are pruned according to bounds of each bucket in the modified grid and a predetermined number to obtain candidate buckets containing the predetermined number of data. The data are retrieved and a ranking score is calculated. The top predetermined number of data are sorted according to ranking scores and a result is returned.
    Type: Application
    Filed: April 25, 2007
    Publication date: October 30, 2008
    Inventors: Chengkai Li, Lipyeow Lim, Haixun Wang, Min Wang
  • Method and apparatus for composing XSL transformations with XML publishing views
    Publication number: 20050021548
    Abstract: A method and apparatus are provided for composing XSL transformations with XML publishing views. XSL transformations are performed on XML documents defined as views of relational databases. A portion of a relational database can be exported to an XML document. An initial view query defines an XML view on the relational database and an XSLT stylesheet specifies at least one transformation. The initial view query is modified to account for an effect of the transformation and the modified view query is applied to the relational database to obtain the XML document. When the modified view query is evaluated on a relational database instance, the same XML document is obtained as would be obtained by evaluating the XSLT stylesheet on the original XML view.
    Type: Application
    Filed: July 24, 2003
    Publication date: January 27, 2005
    Inventors: Philip Bohannon, Henry Korth, Chengkai Li, Suryanarayan Perinkulam