Patents by Inventor Joseph Yan

Joseph Yan 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).

  • Publication number: 20050137959
    Abstract: A method for determining a market clearing price in an electricity market, subject to a plurality of constraints, comprising the steps of defining an objective function relating the MCP and constraints in terms of a nonlinear programming expression, applying Lagrangian relaxation to the nonlinear programming expression to form a Lagrangian dual function; adding penalty terms to the Lagrangian dual function to form an augmented Lagrangian dual function; resolving the augmented Lagrangian dual function using a surrogate optimization framework comprising repeating, until stopping criteria are satisfied, the steps of forming one or more supply sub-problems and an MCP sub-problem; optimizing the MCP sub-problem while keeping all other variables at their latest available values; optimizing at least one of the one or more supply sub-problems while keeping all other variables at their latest available values; updating multipliers used to relax constraints; determining the MCP in accordance with the resolved augmented
    Type: Application
    Filed: December 23, 2003
    Publication date: June 23, 2005
    Inventors: Joseph Yan, Peter Luh, Gary Stern, William Blankson, Ernan Ni, Ying Chen, Feng Zhao, Yaming Ma
  • Patent number: 6086558
    Abstract: The present invention provides improved balloon catheter apparatuses for use in therapies requiring delivery of uniform light to a treatment area. The improved apparatus comprises a balloon having a defined treatment window where the window is delineated using a reflective material. The apparatus may further comprise a fiber optic cable that terminates in a diffusion tip where the diffusion tip is longer than the treatment window. The present invention further provides improved therapeutic methods that use the improved balloon catheters of the present invention.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: July 11, 2000
    Assignee: QLT PhotoTherapeutics, Inc.
    Inventors: Robert David Bower, Michael David Leslie Stonefield, Joseph Yan
  • Patent number: 6013053
    Abstract: The present invention provides improved balloon catheter apparatuses for use in therapies requiring delivery of uniform light to a treatment area. The improved apparatus comprises a balloon having a defined treatment window where the window is delineated using a reflective material. The apparatus may further include a fiber optic cable that terminates in a diffusion tip where the diffusion tip is longer than the treatment window. The present invention further provides improved therapeutic methods that use the improved balloon catheters of the present invention.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: January 11, 2000
    Assignee: QLT Photo Therapeutics Inc.
    Inventors: Bob Bower, Mike Stonefield, Joseph Yan
  • Patent number: 5382885
    Abstract: A robot suitable for micro-surgical application is formed by a robot arm having a position adjustable free end on which are mounted with their respective stators in fixed relationship a master and a slave robot. The position and actuation of the moving element of the master (master floater) and the moving element of the slave (slave floater) are used to couple their moment such that the master floater motion and forces are scaled down and followed by the slave and the slave floater motion and forces are scaled up and followed by the master. The sensed environment forces on the slave floater and sensed hand (environment) forces on the master can be used to improve the coordination between the master and the slave.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: January 17, 1995
    Assignee: The University of British Columbia
    Inventors: Septimiu E. Salcudean, Joseph Yan