Patents by Inventor Michael A. Chang

Michael A. Chang 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).

  • Data-partitioned secondary index (DPSI) partition level join
    Patent number: 9940359
    Abstract: Provided are techniques for a Data-Partitioned Secondary Index (DPSI) partition level join. While using a Data-Partitioned Secondary Index (DPSI) to perform a join of an outer table and an inner table, a different task from multiple tasks is assigned to each partition of the inner table. With each task, a join is performed of the outer table and the assigned partition of the inner table using the DPSI to generate results. The results from each different task are merged.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: April 10, 2018
    Assignee: International Business Machines Corporation
    Inventors: Brian L. Baggett, Michael A. Chang, Shuanglin Guo, Ou Jin, Terence P. Purcell
  • DATA-PARTITIONED SECONDARY INDEX (DPSI) PARTITION LEVEL JOIN
    Publication number: 20150339350
    Abstract: Provided are techniques for a Data-Partitioned Secondary Index (DPSI) partition level join. While using a Data-Partitioned Secondary Index (DPSI) to perform a join of an outer table and an inner table, a different task from multiple tasks is assigned to each partition of the inner table. With each task, a join is performed of the outer table and the assigned partition of the inner table using the DPSI to generate results. The results from each different task are merged.
    Type: Application
    Filed: May 23, 2014
    Publication date: November 26, 2015
    Applicant: International Business Machines Corporation
    Inventors: Brian L. Baggett, Michael A. Chang, Shuanglin Guo, Ou Jin, Terence P. Purcell
  • System for measuring distances in the anterior chamber of the eye
    Patent number: 6631990
    Abstract: A measurement system is provided for measuring distances in the anterior chamber of an eye in conjunction with a slit lamp ophthalmologic microscope table. The measurement system includes a linearly movable interface assembly operative to pick up motions of the microscope assembly in a direction along an optical axis of the eye. A linear measurement assembly is coupled to the interface assembly and operative to determine a distance traveled by the interface. The measurement system may further be provided with a three-axis motion assembly and an optical microscope assembly mounted on the motion assembly. An image recording device is optically aligned with the optical microscope assembly to record images from the optical microscope assembly.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: October 14, 2003
    Assignee: Acmed, Inc.
    Inventors: Manfred A. Schippert, Michael A. Chang, Oscar K. Hollander, Sheldon H. Moll, Gerald T. Cameron, Sr.
  • System for measuring distances in the anterior chamber of the eye
    Publication number: 20020085173
    Abstract: A measurement system is provided for measuring distances in the anterior chamber of an eye in conjunction with a slit lamp ophthalmologic microscope table. The measurement system includes a linearly movable interface assembly operative to pick up motions of the microscope assembly in a direction along an optical axis of the eye. A linear measurement assembly is coupled to the interface assembly and operative to determine a distance traveled by the interface. The measurement system may further be provided with a three-axis motion assembly and an optical microscope assembly mounted on the motion assembly. An image recording device is optically aligned with the optical microscope assembly to record images from the optical microscope assembly.
    Type: Application
    Filed: December 19, 2001
    Publication date: July 4, 2002
    Inventors: Manfred A. Schippert, Michael A. Chang, Oscar K. Hollander, Sheldon H. Moll, Gerald T. Cameron