Patents by Inventor Chang-Kyu Lee

Chang-Kyu Lee 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: 20130322442
    Abstract: Provided are method and apparatus for transmitting session-related parameters required for controlling session maintenance to a multicast agent in a relayed multicast network. The session manager in the relayed multicast network generates control data containing at least one of a T_PPROBE field, an N_PPROBE field, a T_HB field, a N_HB field, a T_HSOLICIT field, an N_HSOLICIT field, a T_HANNOUNCE field, a N_HANNOUNCE field, a T_RELAY field, an N_RELAY field, and a T_LEAVE field, and transmits the generated control data to the multicast agent. Accordingly, relayed multicast service can be provided for each session by setting session-related parameters for each session in a relayed multicast network and transmitting them to a multicast agent.
    Type: Application
    Filed: May 16, 2013
    Publication date: December 5, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Hei KIM, Chang Kyu LEE, Shin Gak KANG
  • Patent number: 8585817
    Abstract: Provided is a biodegradable thermoplastic resin composition including a cellulose derivative and surface-treated natural fiber. More particularly, in preparation of the biodegradable thermoplastic resin composition including the cellulose derivative and the natural fiber, a surface of the natural fiber is treated with alkali and/or sized, thereby increasing a density of the natural fiber, and an interfacial adhesion between the cellulose derivative and the natural fiber to improve a mechanical strength of the biodegradable thermoplastic resin composition. Furthermore, as the cheap natural fiber is used as a reinforcer, the production cost can be reduced.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: November 19, 2013
    Assignee: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Young Kwan Lee, Mi Suk Cho, Chang Kyu Lee
  • Publication number: 20130016282
    Abstract: A method of providing timing information for synchronizing packet streams delivered from a first server and a second server, respectively, that are different from each other under hybrid delivery service environment is provided. The first server delivers a first media object and the second server delivers a second media object. The timing information for synchronizing a second packet including the second media object and a first packet including the first media object is generated in the second server. The timing information and the second packet including the second media object are provided from the second server to the client.
    Type: Application
    Filed: July 11, 2012
    Publication date: January 17, 2013
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Sung Hei KIM, Kwang Deok Seo, Tae Jun Jung, Chang Kyu Lee, Shin Gak Kang
  • Publication number: 20120246332
    Abstract: The present invention relates to use of a circular buffer used by a peer in a multimedia streaming service based on peer-to-peer (P2P), and an operating method thereof. A circular buffer of the present invention may include a buffering section to process a delayed data fragment transmission request from at least one peer present in a network according to a playback of a multimedia content, a storing section to store data to be provided to the at least one peer, a continuous storing section in which data fragments for the playback of the multimedia content are stored in serial order, and a discontinuous storing section in which a space for a received data fragment to be shared with the at least one peer is reserved and a space for a data fragment to be received is reserved.
    Type: Application
    Filed: March 22, 2012
    Publication date: September 27, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Chang Kyu LEE, Sung Hei KIM, Wook HYUN, Shin Gak KANG
  • Publication number: 20120143953
    Abstract: Disclosed is a method for receiving a multimedia content between peers on a peer-to-peer network, including: establishing a neighbor connection relationship which is a relationship to interactively transmit and receive the multimedia content, with the other peer on the peer-to-peer network; establishing a donator connection relationship to receive the multimedia content from the other peer, based on a donator approval request message transmitted to the other peer; receiving a multimedia content piece related message from the other peer based on the established donator connection relationship; and receiving a required multimedia content piece from the other peer according to a result of parsing the multimedia content piece related message.
    Type: Application
    Filed: December 5, 2011
    Publication date: June 7, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Sung Hei KIM, Wook HYUN, Chang Kyu LEE, Shin Gak KANG
  • Publication number: 20110073008
    Abstract: Provided is a biodegradable thermoplastic resin composition including a cellulose derivative and surface-treated natural fiber. More particularly, in preparation of the biodegradable thermoplastic resin composition including the cellulose derivative and the natural fiber, a surface of the natural fiber is treated with alkali and/or sized, thereby increasing a density of the natural fiber, and an interfacial adhesion between the cellulose derivative and the natural fiber to improve a mechanical strength of the biodegradable thermoplastic resin composition. Furthermore, as the cheap natural fiber is used as a reinforcer, the production cost can be reduced.
    Type: Application
    Filed: September 29, 2010
    Publication date: March 31, 2011
    Inventors: Young Kwan Lee, Mi Suk Cho, Chang Kyu Lee
  • Patent number: 7155267
    Abstract: An apparatus and method are provided for monitoring an antenna state of a mobile station. A resister may be provided between a battery voltage terminal and a power source voltage terminal of a power amplifier. A voltage level corresponding to a dropped amount of a voltage due to the resister may be generated and compared with a previously stored voltage level to determine whether current consumption of the power amplifier has been increased. If the increased amount of the current consumption of the power amplifier is large, the currently connected antenna may be determined to be in an abnormal state and a transmission path may be switched to another antenna. If two antennas provided in the mobile communication are in an electrically abnormal state, a baseband chip may inform a user of the abnormal state of the antenna. Accordingly, an output level degradation generated when the antenna is operated in an electrically abnormal state and shortening of the life span of a battery can be prevented.
    Type: Grant
    Filed: February 19, 2004
    Date of Patent: December 26, 2006
    Assignee: LG Electronics Inc.
    Inventor: Chang-Kyu Lee
  • Publication number: 20040166909
    Abstract: An apparatus and method are provided for monitoring an antenna state of a mobile station. A resister may be provided between a battery voltage terminal and a power source voltage terminal of a power amplifier. A voltage level corresponding to a dropped amount of a voltage due to the resister may be generated and compared with a previously stored voltage level to determine whether current consumption of the power amplifier has been increased. If the increased amount of the current consumption of the power amplifier is large, the currently connected antenna may be determined to be in an abnormal state and a transmission path may be switched to another antenna. If two antennas provided in the mobile communication are in an electrically abnormal state, a baseband chip may inform a user of the abnormal state of the antenna. Accordingly, an output level degradation generated when the antenna is operated in an electrically abnormal state and shortening of the life span of a battery can be prevented.
    Type: Application
    Filed: February 19, 2004
    Publication date: August 26, 2004
    Applicant: LG Electronics Inc.
    Inventor: Chang-Kyu Lee
  • Patent number: 6635802
    Abstract: Provided are methods and compositions for increasing the efficiency of nuclear transfer using apoptosis inhibitors, and for the production of transgenic and non-transgenic mammals from cultured cells or cell lines. Methods for cloning mammals, and for producing transgenic and chimeric mammalian tissues and mammals, and chimeric cell lines are also provided.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: October 21, 2003
    Assignee: The Texas A&M University System
    Inventors: Jorge A. Piedrahita, Chang-Kyu Lee, Regina Weaks, Fuller Bazer
  • Patent number: 5570430
    Abstract: A method for automatically evaluating image data taking over a sequence of image frames to determine a contour of a left ventricle (LV). The sequence of image frames are converted to digital data that identify a gray scale value for each pixel in each image frame. Using probability, an initial LV region is estimated based upon previously determined a priori parameters that are derived from processing manually drawn contours of the LV in other hearts, for the sequence of image frames being analyzed. The initial estimate of the LV region is refined using motion constraints, which are also derived from training data determined from the manually-drawn contours of other hearts. An LV region is estimated and its coordinates are extracted for use in applying global shape constraints that provide a more accurate LV boundary estimate for the region around an apex of the left ventricle.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: October 29, 1996
    Assignee: University of Washington
    Inventors: Florence H. Sheehan, Robert M. Haralick, Chang-Kyu Lee