Patents by Inventor Hyunchul Joo

Hyunchul Joo 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 for reducing channel change time of internet protocol television (IPTV) and IPTV service provision server for implementing the same
    Patent number: 8468573
    Abstract: The present invention provides a method for reducing channel change time of an IPTV and an IPTV service provision server for implementing the same, which comprise: determining the type of each of individual channels to be provided to a user and the number of additional intraframes required to be inserted into video data to be provided via the channels; inserting the additional intraframes corresponding to the determined number into the video data; encoding the video data; and transmitting the encoded video data to a first router or a second router according to the determined channel type, before receiving a channel request signal from the user.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: June 18, 2013
    Assignee: Postech Academy-Industry Foundation
    Inventors: Hwangjun Song, Dai-boong Lee, Hyunchul Joo
  • Mobile IPTV system and method of providing mobile IPTV service
    Patent number: 8223665
    Abstract: A mobile IPTV system and a method of providing a mobile IPTV service are provided. The mobile IPTV system includes an IPTV head end, a base station, and a mobile terminal. The IPTV head end encodes data for an IPTV stream into a base layer and an enhancement layer and outputs the encoded data. The base station receives the IPTV stream from the IPV head end and partially truncates the enhancement layer of the IPTV stream according to a combination of a modulation technique and a cording rate which are determined in advance and outputs a transmission IPTV stream. The mobile terminal receives the transmission IPTV stream from the base station. Since an IPTV service is provided in view of a user distribution characteristic of a network, user can be efficiently provided with satisfactory QoS.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: July 17, 2012
    Assignee: Postech Academy-Industry Foundation
    Inventors: Hyunchul Joo, Dai-Boong Lee, Wan Kim, Hwangjun Song, Hyung Rai Oh
  • METHOD FOR REDUCING CHANNEL CHANGE TIME OF INTERNET PROTOCOL TELEVISION (IPTV) AND IPTV SERVICE PROVISION SERVER FOR IMPLEMENTING THE SAME
    Publication number: 20110173670
    Abstract: The present invention provides a method for reducing channel change time of an IPTV and an IPTV service provision server for implementing the same, which comprise: determining the type of each of individual channels to be provided to a user and the number of additional intraframes required to be inserted into video data to be provided via the channels; inserting the additional intraframes corresponding to the determined number into the video data; encoding the video data; and transmitting the encoded video data to a first router or a second router according to the determined channel type, before receiving a channel request signal from the user.
    Type: Application
    Filed: March 24, 2011
    Publication date: July 14, 2011
    Applicant: POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Hwangjun Song, Dai-boong Lee, Hyunchul Joo
  • Method for reducing channel change time of internet protocol television (IPTV) and IPTV service provision server for implementing the same
    Patent number: 7954132
    Abstract: The present invention provides a method for reducing channel change time of an IPTV and an IPTV service provision server for implementing the same, which comprise: determining the type of each of individual channels to be provided to a user and the number of additional intraframes required to be inserted into video data to be provided via the channels; inserting the additional intraframes corresponding to the determined number into the video data; encoding the video data; and transmitting the encoded video data to a first router or a second router according to the determined channel type, before receiving a channel request signal from the user.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: May 31, 2011
    Assignee: Postech Academy-Industry Foundation
    Inventors: Hwangjun Song, Dai-boong Lee, Hyunchul Joo
  • MOBILE IPTV SYSTEM AND METHOD OF PROVIDING MOBILE IPTV SERVICE
    Publication number: 20110026470
    Abstract: A mobile IPTV system and a method of providing a mobile IPTV service are provided. The mobile IPTV system includes an IPTV head end, a base station, and a mobile terminal. The IPTV head end encodes data for an IPTV stream into a base layer and an enhancement layer and outputs the encoded data. The base station receives the IPTV stream from the IPV head end and partially truncates the enhancement layer of the IPTV stream according to a combination of a modulation technique and a cording rate which are determined in advance and outputs a transmission IPTV stream. The mobile terminal receives the transmission IPTV stream from the base station. Since an IPTV service is provided in view of a user distribution characteristic of a network, user can be efficiently provided with satisfactory QoS.
    Type: Application
    Filed: August 26, 2009
    Publication date: February 3, 2011
    Applicant: Postech Academy - Industry Foundation
    Inventors: Hyunchul Joo, Dai-Boong Lee, Wan Kim, Hwangjun Song, Hyung Rai Oh
  • METHOD FOR REDUCING CHANNEL CHANGE TIME OF INTERNET PROTOCOL TELEVISION (IPTV) AND IPTV SERVICE PROVISION SERVER FOR IMPLEMENTING THE SAME
    Publication number: 20080310518
    Abstract: The present invention provides a method for reducing channel change time of an IPTV and an IPTV service provision server for implementing the same, which comprise: determining the type of each of individual channels to be provided to a user and the number of additional intraframes required to be inserted into video data to be provided via the channels; inserting the additional intraframes corresponding to the determined number into the video data; encoding the video data; and transmitting the encoded video data to a first router or a second router according to the determined channel type, before receiving a channel request signal from the user.
    Type: Application
    Filed: July 30, 2007
    Publication date: December 18, 2008
    Inventors: Hwangjun Song, Dai-boong Lee, Hyunchul Joo