Patents by Inventor Keun Hwan Choi

Keun Hwan Choi 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: 11969397
    Abstract: The present invention relates to a composition for preventing or treating transplantation rejection or a transplantation rejection disease, comprising a novel compound and a calcineurin inhibitor. A co-administration of the present invention 1) reduces the activity of pathogenic Th1 cells or Th17 cells, 2) increases the activity of Treg cells, 3) has an inhibitory effect against side effects, such as tissue damage, occurring in the sole administration thereof, 4) inhibits various pathogenic pathways, 5) inhibits the cell death of inflammatory cells, and 6) increases the activity of mitochondria, in an in vivo or in vitro allogenic model, a transplantation rejection disease model, a skin transplantation model, and a liver-transplanted patient, and thus inhibits transplantation rejection along with mitigating side effects possibly occurring in the administration of a conventional immunosuppressant alone.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: April 30, 2024
    Assignee: THE CATHOLIC UNIVERSITY OF KOREA INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Mi-La Cho, Dong-Yun Shin, Jong-Young Choi, Chul-Woo Yang, Sung-Hwan Park, Seon-Yeong Lee, Min-Jung Park, Joo-Yeon Jhun, Se-Young Kim, Hyeon-Beom Seo, Jae-Yoon Ryu, Keun-Hyung Cho
  • Publication number: 20240121984
    Abstract: A display device including a pixel electrode, and a pixel circuit electrically connected to the pixel electrode. The pixel circuit includes a first transistor including sub-transistors electrically connected to each other through a first common node, a second transistor including sub-transistors electrically connected to each other through a second common node, a first electrode electrically connecting the first common node with the second common node, and a second electrode disposed to overlap the first electrode and electrically connected to a direct current power source.
    Type: Application
    Filed: August 25, 2023
    Publication date: April 11, 2024
    Applicant: Samsung Display Co., LTD.
    Inventors: Han Bit KIM, Keun Woo KIM, Doo Na KIM, Sang Sub KIM, Chan Yeob SEOL, Jae Hwan CHU, Sang Gun CHOI
  • Patent number: 9215567
    Abstract: Provided is a system and method for a local area broadcast service, and a wireless transmission apparatus applied to them. In the system, contents to be broadcasted in a predetermined local area are transmitted from a broadcast server to a wireless transmission apparatus through a wired network based on an Internet Protocol and the contents are then broadcasted from the wireless transmission apparatus to one or more user terminal devices. Therefore, according to the present invention, a server of a wired network can easily provide particular contents for each particular local area to one or more user terminal devices in the local area. Moreover, it is possible to reduce the load of the server, when the server provides multiple types of contents or provides contents to a plurality of user terminal devices.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: December 15, 2015
    Assignee: SK TELECOM CO., LTD.
    Inventors: Keun Hwan Choi, Moon Kee Kim, Cheol Ho Yim, Kyung Sik Han, Jae Yeon Noh, Jae Hwang Yu, Min Seok Kim, Sun Joon In
  • Patent number: 9002487
    Abstract: Disclosed are a system and a method for transceiving data in an audio frequency band. The system includes a data input unit to input data for acoustic communication into an audio signal, a transmitting unit to transmit the audio signal including the data in the audio frequency band, and a receiving unit that receives the audio signal including the data and performs synchronization of the audio signal through a matched filtering using a matched filter in order to extract the data according to predetermined extraction processing. The data to be transmitted are added to an audio signal and the audio signal is transmitted in the audio frequency band, so that the data for the acoustic communication are effectively transmitted to the recipient in the audio frequency band.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: April 7, 2015
    Assignees: SK Telecom Co., Ltd., Seoul National University R&DB Foundation
    Inventors: Keun Hwan Choi, Moon Kee Kim, Myung Soon Park, Min Seok Kim, Nam Soo Kim, Hwan Sik Yun, Ki Ho Cho
  • Patent number: 8929395
    Abstract: Disclosed is a multicast system and a multicast method using a shortened address and an apparatus applied to the same. The multicast system using the shortened address according to the present disclosure has a address configuration for supporting a multicast in an IEEE 802.15.4 MAC (Medium Access Control) layer. Accordingly, when a device processes a multicast through an address configuration of the MAC layer, the device receives the multicast through a simple scheduling such as receiving a beacon signal of a coordinator device only when there is a broadcast of a group including the device. As a result, the device can efficiently perform the multicast in a power managing process or a power processing process.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: January 6, 2015
    Assignee: SK Telecom Co., Ltd.
    Inventors: Cheol Ho Yim, Moon Kee Kim, Jae Yeon Noh, Jae Hwang Yu, Keun Hwan Choi, Kyung Sik Han, Min Seok Kim
  • Patent number: 8897474
    Abstract: Provided is a synchronization system and method for acoustic communication in audible frequency range, and an apparatus applied thereto. The synchronization system for acoustic communication in audible frequency range is configured to prevent deterioration of a synchronization performance and to reduce an amount of calculation by calculating a correlation based on a few samples as opposed to calculating a correlation for each sample when a receiver of the acoustic communication performs synchronization while the acoustic communication is performed in the audible frequency range through modification of an audio signal or adding of a predetermined signal to an audio signal.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: November 25, 2014
    Assignees: SK Telecom Co., Ltd., SNU R&DB Foundation
    Inventors: Dong Keon Kim, Moon Kee Kim, Keun Hwan Choi, Jae Hwang Yu, Min Seok Kim, Nam Soo Kim, Hwan Sik Yun, Ki Ho Cho
  • Patent number: 8855090
    Abstract: Disclosed is a network interworking system and method. That is, a header size is minimized through a fragment of an IPv4 packet based IP packet and a header compression and it is implemented such that the IPv4 is loaded in an IEEE 802.15.4 MAC/PHY packet having a small payload, so that it is possible to efficiently transmit an IPv4 packet by using an IEEE 802.15.4 based WPAN. Further, various applications can be executed using the IPv4 while using an IEEE 802.15.4 technology, which is a low power communication technology, in a mobile device.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: October 7, 2014
    Assignee: SK Telecom Co., Ltd.
    Inventors: Jae Yeon Noh, Moon Kee Kim, Cheol Ho Yim, Kyung Sik Han, Keun Hwan Choi, Jae Hwang Yu, Min Seok Kim
  • Patent number: 8798033
    Abstract: Disclosed is a system and a method for minimizing signal interference for a broadcasting and communication convergence section within a local area, and an apparatus applied to the same. The system has a construction of mounting a plurality of multi RF (Radio Frequency) channels within a local area wireless communication apparatus located in a local area and minimizing signal interference between mutually adjacent RF channels within the local area wireless communication apparatus in a standard for providing a broadcasting and communication convergence service. Accordingly, it is possible to remove the mutual channel effects affecting a communication signal without signal interference for adjacent channels due to a broadcasting signal and it is not necessary to enhance a filtering characteristic for the adjacent channels of a chipset, which corresponds to a broadcasting and communication convergence standard structure in a local area, so that there is an advantage of reducing network investment costs.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: August 5, 2014
    Assignee: SK Telecom Co., Ltd.
    Inventors: Moon Kee Kim, Cheol Ho Yim, Kyung Sik Han, Keun Hwan Choi, Jae Yeon Noh, Jae Hwang Yu, Min Seok Kim
  • Patent number: 8565042
    Abstract: Provided is a data reception error reduction system and method in acoustic communication in audible frequency range, and an apparatus applied thereto. The data reception error reduction system in the acoustic communication in audible frequency range may be configured to reduce a data reception error in a receiver by taking into consideration that a sound signal is noisy and is significantly affected by a change in the ambient environment when the acoustic communication is performed in the audio frequency band through modification of an audio signal or adding of a predetermined signal to an audio signal. Accordingly, the data reception error may be reduced in the receiver even in an environment where a sound signal is noisy and is significantly affected by a change in the ambient environment, and reliability of data transmission may increase.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: October 22, 2013
    Assignees: SK Telecom Co., Ltd, SNU R&DB Foundation
    Inventors: Dong Keon Kim, Moon Kee Kim, Keun Hwan Choi, Jae Hwang Yu, Min Seok Kim, Nam Soo Kim, Hwan Sik Yun, Ki Ho Cho
  • Publication number: 20120269038
    Abstract: Provided is a data reception error reduction system and method in acoustic communication in audible frequency range, and an apparatus applied thereto. The data reception error reduction system in the acoustic communication in audible frequency range may be configured to reduce a data reception error in a receiver by taking into consideration that a sound signal is noisy and is significantly affected by a change in the ambient environment when the acoustic communication is performed in the audio frequency band through modification of an audio signal or adding of a predetermined signal to an audio signal. Accordingly, the data reception error may be reduced in the receiver even in an environment where a sound signal is noisy and is significantly affected by a change in the ambient environment, and reliability of data transmission may increase.
    Type: Application
    Filed: June 21, 2012
    Publication date: October 25, 2012
    Applicants: SNU R & DB FOUNDATION, SK TELECOM CO., LTD.
    Inventors: Dong Keon KIM, Moon Kee KIM, Keun Hwan CHOI, Jae Hwang YU, Min Seok KIM, Nam Soo KIM, Hwan Sik YUN, Ki Ho CHO
  • Publication number: 20120269371
    Abstract: Provided is a synchronization system and method for acoustic communication in audible frequency range, and an apparatus applied thereto. The synchronization system for acoustic communication in audible frequency range is configured to prevent deterioration of a synchronization performance and to reduce an amount of calculation by calculating a correlation based on a few samples as opposed to calculating a correlation for each sample when a receiver of the acoustic communication performs synchronization while the acoustic communication is performed in the audible frequency range through modification of an audio signal or adding of a predetermined signal to an audio signal.
    Type: Application
    Filed: June 18, 2012
    Publication date: October 25, 2012
    Applicants: SNU R&DB FOUNDATION, SK TELECOM CO., LTD.
    Inventors: Dong Keon KIM, Moon Kee KIM, Keun Hwan CHOI, Jae Hwang YU, Min Seok KIM, Nam Soo KIM, Hwan Sik YUN, Ki Ho CHO
  • Publication number: 20120170579
    Abstract: Disclosed is a multicast system and a multicast method using a shortened address and an apparatus applied to the same. The multicast system using the shortened address according to the present disclosure has a address configuration for supporting a multicast in an IEEE 802.15.4 MAC (Medium Access Control) layer. Accordingly, when a device processes a multicast through an address configuration of the MAC layer, the device receives the multicast through a simple scheduling such as receiving a beacon signal of a coordinator device only when there is a broadcast of a group including the device. As a result, the device can efficiently perform the multicast in a power managing process or a power processing process.
    Type: Application
    Filed: October 27, 2009
    Publication date: July 5, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Cheol Ho Yim, Moon Kee Kim, Jae Yeon Noh, Jae Hwang Yu, Keun Hwan Choi, Kyung Sik Han, Min Seok Kim
  • Publication number: 20120163362
    Abstract: Disclosed is a network interworking system and method. That is, a header size is minimized through a fragment of an IPv4 packet based IP packet and a header compression and it is implemented such that the IPv4 is loaded in an IEEE 802.15.4 MAC/PHY packet having a small payload, so that it is possible to efficiently transmit an IPv4 packet by using an IEEE 802.15.4 based WPAN. Further, various applications can be executed using the IPv4 while using an IEEE 802.15.4 technology, which is a low power communication technology, in a mobile device.
    Type: Application
    Filed: October 27, 2009
    Publication date: June 28, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jae Yeon Noh, Moon Kee Kim, Cheol Ho Yim, Kyung Sik Han, Keun Hwan Choi, Jae Hwang Yu, Min Seok Kim
  • Publication number: 20120163363
    Abstract: Disclosed is a system and a method for minimizing signal interference for a broadcasting and communication convergence section within a local area, and an apparatus applied to the same. The system has a construction of mounting a plurality of multi RF (Radio Frequency) channels within a local area wireless communication apparatus located in a local area and minimizing signal interference between mutually adjacent RF channels within the local area wireless communication apparatus in a standard for providing a broadcasting and communication convergence service. Accordingly, it is possible to remove the mutual channel effects affecting a communication signal without signal interference for adjacent channels due to a broadcasting signal and it is not necessary to enhance a filtering characteristic for the adjacent channels of a chipset, which corresponds to a broadcasting and communication convergence standard structure in a local area, so that there is an advantage of reducing network investment costs.
    Type: Application
    Filed: March 7, 2012
    Publication date: June 28, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Moon Kee KIM, Cheol Ho YIM, Kyung Sik HAN, Keun Hwan CHOI, Jae Yeon NOH, Jae Hwang YU, Min Seok KIM
  • Publication number: 20120026999
    Abstract: Provided is a system and method for a local area broadcast service, and a wireless transmission apparatus applied to them. In the system, contents to be broadcasted in a predetermined local area are transmitted from a broadcast server to a wireless transmission apparatus through a wired network based on an Internet Protocol and the contents are then broadcasted from the wireless transmission apparatus to one or more user terminal devices. Therefore, according to the present invention, a server of a wired network can easily provide particular contents for each particular local area to one or more user terminal devices in the local area. Moreover, it is possible to reduce the load of the server, when the server provides multiple types of contents or provides contents to a plurality of user terminal devices.
    Type: Application
    Filed: October 29, 2009
    Publication date: February 2, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Keun Hwan Choi, Moon Kee Kim, Cheol Ho Yim, Kyung Sik Han, Jae Yeon Noh, Jae Hwang Yu, Min Seok Kim, Sun Joon In
  • Publication number: 20110134971
    Abstract: Disclosed are a system and a method for transceiving data in an audio frequency band. The system includes a data input unit to input data for acoustic communication into an audio signal, a transmitting unit to transmit the audio signal including the data in the audio frequency band, and a receiving unit that receives the audio signal including the data and performs synchronization of the audio signal through a matched filtering using a matched filter in order to extract the data according to predetermined extraction processing. The data to be transmitted are added to an audio signal and the audio signal is transmitted in the audio frequency band, so that the data for the acoustic communication are effectively transmitted to the recipient in the audio frequency band.
    Type: Application
    Filed: August 7, 2009
    Publication date: June 9, 2011
    Applicant: SK TELECOM CO., LTD.
    Inventors: Keun Hwan Choi, Moon Kee Kim, Myung Soon Park, Min Seok Kim, Nam Soo Kim, Hwan Sik Yun, Ki Ho Cho
  • Publication number: 20090270078
    Abstract: Disclosed are a method of configuring a keypad of a terminal, a terminal configured thereby, a system including such a terminal, and a reconfigurable keypad. A keypad server includes keypad configuration files according to various applications implemented in a terminal, and provides the keypad configuration file to the terminal. The terminal receives the keypad configuration file from the keypad server through a wired or wireless network, and includes a keypad area on which a keypad configuration according to the keypad configuration file is displayed. In this way, various types of keypads can be implemented.
    Type: Application
    Filed: May 30, 2007
    Publication date: October 29, 2009
    Inventors: Gi-Seon Nam, Moon-Kee Kim, Tae-Ho Yu, Youg-Ha Jeon, Ki-Mo Chung, Jung-Keun Yang, Jong-Tae Ihm, Jung-Yeoun Kim, Keun-Hwan Choi, Byoung-Ki Cho
  • Patent number: 6115498
    Abstract: A character generating apparatus for generating a character image representing a character and a method therefor, which are capable of preventing a flicker phenomenon, which occurs in the television receiver, using a simple algorithm. In the present invention, an edge of the character is detected based on font data of the character, and a shadow property is determined from an attribute data of the character. A character image is generated by forming a shadow, having the shadow property, adjacent to the detected edge.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: September 5, 2000
    Assignee: LG Electronics Inc.
    Inventors: Seyong Ro, Keun Hwan Choi