Patents by Inventor Hee-choon Lee

Hee-choon 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: 20220216429
    Abstract: The present invention relates to a multi-component host material and an organic electroluminescent device comprising the same. By comprising a specific combination of the multi-component host compounds, the organic electroluminescent device according to the present invention can provide high luminous efficiency and excellent lifespan characteristics.
    Type: Application
    Filed: March 8, 2022
    Publication date: July 7, 2022
    Inventors: Hee-Choon AHN, Young-Kwang KIM, Su-Hyun LEE, Ji-Song JUN, Seon-Woo LEE, Chi-Sik KIM, Kyoung-Jin PARK, Nam-Kyun KIM, Kyung-Hoon CHOI, Jae-Hoon SHIM, Young-Jun CHO, Kyung-Joo LEE
  • Publication number: 20220216430
    Abstract: The present invention relates to a multi-component host material and an organic electroluminescent device comprising the same. By comprising a specific combination of the multi-component host compounds, the organic electroluminescent device according to the present invention can provide high luminous efficiency and excellent lifespan characteristics.
    Type: Application
    Filed: March 8, 2022
    Publication date: July 7, 2022
    Inventors: Hee-Choon AHN, Young-Kwang KIM, Su-Hyun LEE, Ji-Song JUN, Seon-Woo LEE, Chi-Sik KIM, Kyoung-Jin PARK, Nam-Kyun KIM, Kyung-Hoon CHOI, Jae-Hoon SHIM, Young-Jun CHO, Kyung-Joo LEE
  • Patent number: 9988741
    Abstract: Provided is a sapphire single crystal heat treatment method comprising the steps of: charging a sapphire single crystal into a chamber; raising the temperature in the chamber to a target temperature by heating the chamber; holding the temperature in the chamber at a constant temperature; and cooling the inside of the chamber to room temperature, wherein the temperature raising step comprises: a first temperature raising step of raising the temperature to a first set temperature at a temperature raising rate of 4° C./min to 5° C./min; and a second temperature raising step of raising the temperature to a second set temperature at a temperature raising rate of 1° C./min or less after the first temperature raising step has been completed. The temperature raising process is executed in a multi-stage, to reduce the temperature raising time and prevent a sapphire single crystal from being affected by heat.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: June 5, 2018
    Assignee: SAPPHIRE TECHNOLOGY CO., LTD.
    Inventors: Hee Choon Lee, Yi Sik Choi, Sung Hwan Moon, Gye Won Jang, Bok Kee Na
  • Patent number: 9532035
    Abstract: An imaging system on an aerial vehicle, includes: a group of rotating camera including at least a first and a second rotating cameras on the aerial vehicle; and a control part which controls a first virtual rotation track of the first rotating camera and a second virtual rotation track of the second rotating camera and allows shots to be taken at multiple photograph-shooting points on the first virtual rotation track and the second virtual rotation track; wherein the control part controls a set of multiple photograph-shooting points on the first virtual rotation track and those on the second virtual rotation track to be substantially in a grid shape. Accordingly, a 3D image could be acquired by using the group of rotating cameras on the aerial vehicle during a relatively short endurance flight and more information on images created in such a method could be estimated.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: December 27, 2016
    Assignee: National Institute of Meteorological Research
    Inventors: Kyu Young Choi, Yong Hee Lee, Kwang Deuk Ahn, Hee Choon Lee
  • Publication number: 20160173859
    Abstract: An imaging system on an aerial vehicle, includes: a group of rotating camera including at least a first and a second rotating cameras on the aerial vehicle; and a control part which controls a first virtual rotation track of the first rotating camera and a second virtual rotation track of the second rotating camera and allows shots to be taken at multiple photograph-shooting points on the first virtual rotation track and the second virtual rotation track; wherein the control part controls a set of multiple photograph-shooting points on the first virtual rotation track and those on the second virtual rotation track to be substantially in a grid shape. Accordingly, a 3D image could be acquired by using the group of rotating cameras on the aerial vehicle during a relatively short endurance flight and more information on images created in such a method could be estimated.
    Type: Application
    Filed: January 6, 2016
    Publication date: June 16, 2016
    Inventors: Kyu Young Choi, Yong Hee Lee, Kwang Deuk Ahn, Hee Choon Lee
  • Patent number: 9367919
    Abstract: A method for estimating a position of a target by using an image acquired from a camera is provided. The method includes the steps of: (a) setting multiple virtual estimated reference points by dividing a view-path; (b) comparing altitude values of the respective estimated reference points with those of respective points on terrain; (c) searching neighboring virtual estimated reference points among the multiple virtual estimated reference points to satisfy a requirement under which a difference between an altitude zk of one point among the neighboring estimated reference points and that of the terrain corresponding thereto and a difference between an altitude zk+1 of the other point among the neighboring estimated reference points and that of the terrain corresponding thereto have different signs; and (d) determining that the actual position of the target exists between the searched estimated reference points Pk.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: June 14, 2016
    Assignee: National Institute of Meteorological Research
    Inventors: Kyu Young Choi, Jong Chul Ha, Kwang Deuk Ahn, Hee Choon Lee
  • Publication number: 20160117828
    Abstract: A method for estimating a position of a target by using an image acquired from a camera is provided. The method includes the steps of: (a) setting multiple virtual estimated reference points by dividing a view-path; (b) comparing altitude values of the respective estimated reference points with those of respective points on terrain; (c) searching neighboring virtual estimated reference points among the multiple virtual estimated reference points to satisfy a requirement under which a difference between an altitude zk of one point among the neighboring estimated reference points and that of the terrain corresponding thereto and a difference between an altitude zk+1 of the other point among the neighboring estimated reference points and that of the terrain corresponding thereto have different signs; and (d) determining that the actual position of the target exists between the searched estimated reference points Pk.
    Type: Application
    Filed: January 6, 2016
    Publication date: April 28, 2016
    Inventors: Kyu Young Choi, Jong Chul Ha, Kwang Deuk Ahn, Hee Choon Lee
  • Publication number: 20150267321
    Abstract: Provided is a sapphire single crystal heat treatment method comprising the steps of: charging a sapphire single crystal into a chamber; raising the temperature in the chamber to a target temperature by heating the chamber; holding the temperature in the chamber at a constant temperature; and cooling the inside of the chamber to room temperature, wherein the temperature raising step comprises: a first temperature raising step of raising the temperature to a first set temperature at a temperature raising rate of 4° C./min to 5° C./min; and a second temperature raising step of raising the temperature to a second set temperature at a temperature raising rate of 1° C./min or less after the first temperature raising step has been completed. The temperature raising process is executed in a multi-stage, to reduce the temperature raising time and prevent a sapphire single crystal from being affected by heat.
    Type: Application
    Filed: September 10, 2013
    Publication date: September 24, 2015
    Inventors: Hee Choon Lee, Yi Sik Choi, Sung Hwan Moon, Gye Won Jang, Bok Kee Na
  • Patent number: 5578951
    Abstract: A power-on reset circuit includes a discharger for applying a negative voltage to the gate of a transistor and quickly discharging a first intermediate signal during a power-off state to thereby generate a stable power-on reset signal even in fast switching of a power supply voltage, and a delay and buffer for maintaining the power-on reset signal at a first constant voltage for a predetermined time.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: November 26, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hee-choon Lee, Je-whan Yoo