Patents by Inventor Kevin H. Kim

Kevin H. Kim 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).

  • Patent number: 10404296
    Abstract: An approach to digital compensation uses a particular structure for a digital pre-distorter (DPD) which acts as a relatively accurate pre-inverse of a non-linear circuit (e.g., a non-linear transmit chain involving digital-to-analog converter (DAC), lowpass filter, modulator, bandpass filter, and power amplifier) while making use of a relatively small number of parameters that characterize the non-linearity and/or parameters that provide accurate linearization without requiring continual updating.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: September 3, 2019
    Assignee: NanoSemi, Inc.
    Inventors: Helen H. Kim, Alexandre Megretski, Yan Li, Kevin Chuang, Zohaib Mahmood
  • Publication number: 20190260402
    Abstract: Disclosed are implementations, including a method for digital predistortion of multiband signals that includes receiving an input signal comprising multiple signal portions in different frequency bands, the input signal configured to be processed by a transmit chain, of a power amplification system, comprising at least a power amplifier that produces output with non-linear distortions, with the non-linear distortions of the transmit chain being represented using a set of basis functions derived according to a single-band model of the non-linear distortions. The method further includes performing digital predistortion on signal components derived from the multiple signal portions of the input signal using a reduced set of the basis functions that excludes at least some basis functions for at least some cross-terms resulting from a full expansion of the single-band model applied to the multiple signal portions, to produce a digital predistorted signal provided to the transmit chain.
    Type: Application
    Filed: June 11, 2018
    Publication date: August 22, 2019
    Inventors: Kevin Chuang, Alexandre Megretski, Yan Li, Helen H. Kim
  • Publication number: 20190260401
    Abstract: A linearization system computes a robust set of quantities characterizing a nonlinearity of a transmit chain including a power amplifier by combining a current set of quantities characterizing the nonlinearity of the transmit chain with a weighted combination of prior sets of quantities characterizing the nonlinearity of the transmit chain.
    Type: Application
    Filed: June 11, 2018
    Publication date: August 22, 2019
    Inventors: Alexandre Megretski, Zohaib Mahmood, Kevin Chuang, Yan Li, Helen H. Kim
  • Patent number: 10368720
    Abstract: A system for stereo reconstruction from a monoscopic endoscope includes an image pick-up element at a distal end thereof and a working channel defined by a body of the monoscopic endoscope. The system comprises a light patterning component configured to be disposed within the working channel such that a light emitting end of the light patterning component will be fixed with a defined relative distance from the distal end of the image pick-up element. The system also includes a data processor adapted to be in communication with the image pick-up element. The light patterning component forms a pattern of light that is projected onto a region of interest. The data processor receives an image signal of the region of interest that includes the pattern, and determines a distance from the endoscope to the region of interest based on the image signal and based on the defined relative distance.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: August 6, 2019
    Assignee: The Johns Hopkins University
    Inventors: Kevin C. Olds, Tae Soo Kim, Russell H. Taylor, Austin Reiter
  • Publication number: 20190238204
    Abstract: An approach to predistortion of a first set of signals for an antenna array allows beam-steering without corrupting spectrum away from the main beam and where other users may be located. In some implementations, the predistorter uses fewer than one predistorter per signal (i.e., per power amplifier or per antenna), and/or has the computational complexity of such fewer predistorters, to generate predistortions of the first set of signals for amplification and transmission via the antenna array.
    Type: Application
    Filed: October 6, 2017
    Publication date: August 1, 2019
    Inventors: Helen H. Kim, Alexandre Megretski, Yan Li, Kevin Chuang, Zohaib Mahmood, Yanyu Huang
  • Patent number: 8252893
    Abstract: The present invention is directed to the examination of the pattern of immunodominant CD8 T cell epitopes in the E6 and E7 protein of Human Papillomavirus (HPV) and its further characterization in terms of its amino acid sequence and HLA restriction. These epitopes are identified based on their ability to induce strong CD8 T cell response and therefore, are important as sources of antigens for dendritic cell immunotherapy to treat cervical cancer. The present invention contemplates identifying a number of similar epitopes restricted by a wide variety of HLA types so that they can be used in concert to develop a preventative vaccine, which can be used for general population.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: August 28, 2012
    Assignee: Board of Trustees of the University of Arkansas
    Inventors: Kevin H. Kim, Mayumi Nakagawa, Anna-Barbara Moscicki