Patents by Inventor Nak Jin Choi

Nak Jin 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: 11358122
    Abstract: A moisture absorbent for a vehicle lamp includes a first inorganic material, a second inorganic material, alkali metal phosphate, and a polymer wax are included. A composite moisture absorbent structure includes a first moisture absorbent pack including a powder type moisture absorbent and a second moisture absorbent pack including a capsule type moisture absorbent are embedded.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: June 14, 2022
    Assignee: DesiKhan Co., Ltd.
    Inventors: Sin Jong Hyung, Nak Cheon Choi, You Jin Lee, Jong Hyup Kim
  • Patent number: 11345643
    Abstract: Provided are an additive composition for a tile cement mortar and a tile cement mortar including the additive composition for a tile cement mortar. The provided additive composition for a tile cement mortar includes cellulose ether and urea, wherein the amount of the urea is from 5 parts by weight to 43 parts by weight based on 100 parts by weight of the cellulose ether.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: May 31, 2022
    Assignee: LOTTE FINE CHEMICAL CO., LTD.
    Inventors: Yun Na Kim, Nak Woon Choi, Bong Jin Kwon, Min Seok Kang, Hyun Ji Jeong
  • Patent number: 11054174
    Abstract: Disclosed is an apparatus for collecting a by-product in a semiconductor process, the apparatus including: a housing; a heater plate; a heater power supply unit; first and second upper horizontal brackets collecting a part of a by-product in a powder form; a by-product collecting tower allowing the exhaust gas to pass vertically and collecting a part of the by-product in a powder form; a lower horizontal bracket guiding the exhaust gas toward a window and collecting a part of the by-product in a powder form; the window blocking the powder form by-product from introducing toward a gas collecting and discharging port and guiding the exhaust gas thereto; and the gas collecting and discharging port. Accordingly, the apparatus can increase capacity of collecting by-products with a simple structure, thereby extending a replacement period of the apparatus and collect a large amount of by-products efficiently over a long period of time.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: July 6, 2021
    Assignee: MILAEBO CO., LTD.
    Inventors: Kyu Hyun Hwang, Nak Jin Choi, Tae Yeon Kim, Kyung Tae Kim, Che Hoo Cho
  • Publication number: 20200217559
    Abstract: Disclosed is an apparatus for collecting a by-product in a semiconductor process, the apparatus including: a housing; a heater plate; a heater power supply unit; first and second upper horizontal brackets collecting a part of a by-product in a powder form; a by-product collecting tower allowing the exhaust gas to pass vertically and collecting a part of the by-product in a powder form; a lower horizontal bracket guiding the exhaust gas toward a window and collecting a part of the by-product in a powder form; the window blocking the powder form by-product from introducing toward a gas collecting and discharging port and guiding the exhaust gas thereto; and the gas collecting and discharging port. Accordingly, the apparatus can increase capacity of collecting by-products with a simple structure, thereby extending a replacement period of the apparatus and collect a large amount of by-products efficiently over a long period of time.
    Type: Application
    Filed: January 9, 2019
    Publication date: July 9, 2020
    Applicant: MILAEBO CO., LTD.
    Inventors: Kyu Hyun Hwang, Nak Jin Choi, Tae Yeon Kim, Kyung Tae Kim, Che Hoo Cho
  • Patent number: 9494543
    Abstract: Disclosed is an electrochemical gas sensor using micro electro mechanical systems (MEMS). The MEMS electrochemical gas sensor includes: a substrate a lower central region of which is etched by a predetermined thickness; a first insulation film formed on the substrate; a heat emitting resistance body formed on the first insulation film; a second insulation film formed on the heat emitting resistance body; a reference electrode formed in an upper central region of the second insulation film; a solid electrolyte formed on the reference electrode; and a detection electrode formed on the solid electrolyte.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: November 15, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seung Eon Moon, Nak Jin Choi, Hyung Kun Lee, Jae Woo Lee, Woo Seok Yang, Jong Dae Kim
  • Patent number: 9439010
    Abstract: An audio tuning system including: an interface configured to provide a test signal to a reference device and to a target device; and a controller configured to acquire a result of audio processing in response to the test signal from the reference device and a result of audio processing in response to the test signal from the target device; compare the results; and adjust an audio processing characteristic value of the target device to match that of the reference device based on a result of the comparison. The audio tuning system may automatically tune the audio characteristic of the target device to match the reference device.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: September 6, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jung-min Choi, Young-suk Song, Nak-jin Choi, Hae-kwang Park, Joon-ho Son
  • Patent number: 9372165
    Abstract: Disclosed are a gas sensor, and a method of manufacturing and using the same. The method includes: forming a detection material on a heater; coating an encapsulant on the detection material; and heating the heater to remove the encapsulant from the detection material when the gas sensor is operated.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: June 21, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyung Kun Lee, Woo Seok Yang, Nak Jin Choi, Seung Eon Moon, Jong Dae Kim
  • Publication number: 20150047417
    Abstract: The present invention relates to a core-shell nanoparticle, a method of fabricating the same and a gas sensor using the same, more particularly to a core-shell nanoparticle which includes a core including a first metal oxide and a shell including a second metal oxide, the first metal oxide and the second metal oxide being oxides of the same metal having different oxidation states, a method of fabricating the same and a gas sensor using the same.
    Type: Application
    Filed: June 6, 2014
    Publication date: February 19, 2015
    Applicants: Electronics and Telecommunications Research Institute, Pusan National University Industry-University Cooperation Foundation
    Inventors: Hyung Ju PARK, Nak Jin CHOI, Moon Youn JUNG, Dae Sik LEE, Hyuntae KANG, Kang Hyun PARK
  • Publication number: 20150043738
    Abstract: An audio tuning system including: an interface configured to provide a test signal to a reference device and to a target device; and a controller configured to acquire a result of audio processing in response to the test signal from the reference device and a result of audio processing in response to the test signal from the target device; compare the results; and adjust an audio processing characteristic value of the target device to match that of the reference device based on a result of the comparison. The audio tuning system may automatically tune the audio characteristic of the target device to match the reference device.
    Type: Application
    Filed: October 15, 2013
    Publication date: February 12, 2015
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jung-min CHOI, Young-suk SONG, Nak-jin CHOI, Hae-kwang PARK, Joon-ho SON
  • Patent number: 8912613
    Abstract: Provided are a dual-side micro gas sensor and a method of fabricating the same. The sensor may include an elastic layer, a heat-generating resistor layer on the elastic layer, an interlayered insulating layer on the heat-generating resistor layer, an upper sensing layer on the interlayered insulating layer, and a lower sensing layer provided below the elastic layer to face the heat-generating resistor layer, thereby reducing heat loss of the heat-generating resistor layer.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: December 16, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyung-Kun Lee, Seungeon Moon, Nak Jin Choi, Jaewoo Lee
  • Publication number: 20140208838
    Abstract: Provided is a catalytic combustible gas sensor using a porous membrane embedded micro-heater and a micro electro mechanical system (MEMS) technology. The present disclosure provides a gas sensor that is structurally, mechanically, and electrically stable, and has a simple device fabrication process in a MEMS catalytic combustible gas sensor that is miniaturized and also consumes a significantly small amount of power by puncturing a plurality of holes in membranes, a heating resistor, and a sensing electrode, by etching and thereby thermally isolating a substrate by a predetermined thickness through the plurality of holes, and by including a sensing structure formed using a sensing material and a compensation structure formed using a compensation material.
    Type: Application
    Filed: May 17, 2013
    Publication date: July 31, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Seung Eon MOON, Jae Woo LEE, Hyung-Kun LEE, Nak Jin CHOI, Woo Seok YANG, Jong Dae KIM
  • Publication number: 20140175570
    Abstract: Provided are a dual-side micro gas sensor and a method of fabricating the same. The sensor may include an elastic layer, a heat-generating resistor layer on the elastic layer, an interlayered insulating layer on the heat-generating resistor layer, an upper sensing layer on the interlayered insulating layer, and a lower sensing layer provided below the elastic layer to face the heat-generating resistor layer, thereby reducing heat loss of the heat-generating resistor layer.
    Type: Application
    Filed: June 4, 2013
    Publication date: June 26, 2014
    Inventors: Hyung-Kun LEE, Seungeon MOON, Nak Jin CHOI, Jaewoo LEE
  • Publication number: 20140129215
    Abstract: An electronic device and a method for measuring quality of a voice signal are provided. The method includes generating a mask of an echo signal and a mask of a speech signal by comparing the echo signal and the speech signal included in an input sound with respective thresholds, calculating an estimation of the echo signal and an estimation of the speech signal, and measuring quality of the input speech signal by using each of the calculated estimation of the echo signal and the calculated estimation of the speech signal.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 8, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Nak-Jin CHOI, Byeong-Jun KIM, Ju-Hee CHANG, Brian C.J. MOORE
  • Patent number: 8683847
    Abstract: Disclosed are an MEMS type semiconductor gas sensor using a microheater having many holes and a method for manufacturing the same. The MEMS type semiconductor gas sensor includes: a substrate of which a central region is etched with a predetermined thickness; a second membrane formed at an upper portion of the central region of the substrate and having many holes; a heat emitting resistor formed on the second membrane and having many holes; a first membrane formed on the second membrane including the heat emitting resistor and having many holes; a sensing electrode formed on the first membrane and having many holes; and a sensing material formed on the sensing electrode.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: April 1, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Eon Moon, Jae Woo Lee, Nak Jin Choi, Hyung Kun Lee, Woo Seok Yang, Jong Dae Kim
  • Publication number: 20130091929
    Abstract: Disclosed are a gas sensor, and a method of manufacturing and using the same. The method includes: forming a detection material on a heater; coating an encapsulant on the detection material; and heating the heater to remove the encapsulant from the detection material when the gas sensor is operated.
    Type: Application
    Filed: August 24, 2012
    Publication date: April 18, 2013
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyung Kun Lee, Woo Seok Yang, Nak Jin Choi, Seung Eon Moon, Jong Dae Kim
  • Publication number: 20130075255
    Abstract: Disclosed is an electrochemical gas sensor using micro electro mechanical systems (MEMS). The MEMS electrochemical gas sensor includes: a substrate a lower central region of which is etched by a predetermined thickness; a first insulation film formed on the substrate; a heat emitting resistance body formed on the first insulation film; a second insulation film formed on the heat emitting resistance body; a reference electrode formed in an upper central region of the second insulation film; a solid electrolyte formed on the reference electrode; and a detection electrode formed on the solid electrolyte.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 28, 2013
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Seung Eon Moon, Nak Jin Choi, Hyung Kun Lee, Jae Woo Lee, Woo Seok Yang, Jong Dae Kim
  • Publication number: 20120198918
    Abstract: Disclosed are an MEMS type semiconductor gas sensor using a microheater having many holes and a method for manufacturing the same. The MEMS type semiconductor gas sensor includes: a substrate of which a central region is etched with a predetermined thickness; a second membrane formed at an upper portion of the central region of the substrate and having many holes; a heat emitting resistor formed on the second membrane and having many holes; a first membrane formed on the second membrane including the heat emitting resistor and having many holes; a sensing electrode formed on the first membrane and having many holes; and a sensing material formed on the sensing electrode.
    Type: Application
    Filed: January 9, 2012
    Publication date: August 9, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seung Eon MOON, Jae Woo LEE, Nak Jin CHOI, Hyung Kun LEE, Woo Seok YANG, Jong Dae KIM
  • Publication number: 20120149560
    Abstract: Provided is a method of manufacturing porous metal oxide, the method including: preparing a metal-organic framework (MOF) wherein an ion of a metal to be used as a catalyst is linked to an organic ligand; impregnating the MOF with a precursor solution of metal oxide to be manufactured; and thermally treating the metal oxide precursor solution-impregnated MOF to remove the organic ligand. The inventive method of manufacturing porous metal oxide involves the impregnation of a metal oxide precursor solution in a MOF wherein metal ions are uniformly linked to organic ligands and the thermal treatment (calcination) of the metal oxide precursor solution-impregnated MOF to remove the organic ligands.
    Type: Application
    Filed: October 28, 2011
    Publication date: June 14, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyung-Kun LEE, Nak Jin Choi, Seungeon Moon, Woo Seok Yang
  • Patent number: 8194883
    Abstract: A method and an apparatus for designing a sound compensation filter of a portable terminal are provided. The method includes synchronizing a signal input through a microphone of the system and a test signal, estimating a loss interval of the synchronized signal, compensating for a frame signal delayed by a signal loss in a time axis when the signal loss of the estimated loss interval is greater than a threshold and restoring the loss interval of the signal.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: June 5, 2012
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Nak-Jin Choi
  • Publication number: 20110141241
    Abstract: Provided is a convergence control module for a three-dimensional (3D) camera that can be operated with low power to reduce power consumption, which has been a problem in the 3D camera. A 3D camera module includes at least one camera module, a moving guide for supporting the camera module and providing a moving path, a control driver for moving the camera module along the moving guide, and a control unit for controlling the control driver.
    Type: Application
    Filed: May 17, 2010
    Publication date: June 16, 2011
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyung Kun LEE, Kwang Suk Yang, Nak Jin Choi, Sun Kyung Jung, Kang Ho Park, Jong Dae Kim