Patents by Inventor Cheol-jin Lee
Cheol-jin 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).
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Publication number: 20240136604Abstract: The present invention provides a battery safety test device includes: a mechanical switch element having one end connected to either a battery positive or negative electrode and the other end connected to an electronic switching element; the electronic switching element having one end connected to the mechanical switch element and the other end connected to the other of the battery positive or negative electrode; a voltage sensor for measuring a voltage of the battery after the mechanical switch element and the electronic switching element are turned on; and a current sensor for measuring a current of the battery after the mechanical switch element and the electronic switching element are turned on.Type: ApplicationFiled: December 29, 2023Publication date: April 25, 2024Applicant: LG ENERGY SOLUTION, LTD.Inventors: Won Hyeok LEE, Hyung Jin HWANG, Seong Ha CHA, Ui Yong JEONG, In Cheol SHIN
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Publication number: 20220399177Abstract: A method of manufacturing a CNT paste emitter in accordance with an exemplary embodiment of the present disclosure includes a process of mixing first CNT powder, graphite nanoparticles, SiC nanoparticles, Ni nanoparticles, a dispersant and distilled water and then performing a dispersion process by means of ultrasonication, a process of acquiring second CNT powder by filtering a solution dispersed during the dispersion process, a process of mixing the second CNT powder with a graphite binder and then preparing a CNT paste by means of ball milling, and a process of forming an interface layer on a metal or graphite substrate and then bonding the CNT paste.Type: ApplicationFiled: June 29, 2022Publication date: December 15, 2022Applicant: Korea University Research and Business FoundationInventors: Cheol Jin LEE, Han Bin GO, Sang Heon LEE
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Patent number: 10912180Abstract: The present disclosure relates to an X-ray source apparatus and a control method of the X-ray source apparatus in which a cathode electrode and a gate electrode are arranged in an array form to enable matrix control, and, thus, it is possible to irradiate X-rays at an optimum dose for each position on the subject. Therefore, it is possible to suppress the irradiation of more X-rays than are needed to the subject. Also, it is possible to obtain a high-resolution and high-quality X-ray image. As such, two-dimensional matrix control makes it easy to control the dose of X-rays and makes it possible to uniformly irradiate X-rays to the subject. Therefore, it is possible to manufacture a high-resolution surface X-ray source with less dependence on the size of the focus of electron beams.Type: GrantFiled: April 1, 2019Date of Patent: February 2, 2021Assignee: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin Lee, Sang Heon Lee, Jun Soo Han, Han Bin Go
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Patent number: 10566167Abstract: The present disclosure provides a method of manufacturing a carbon nanotube electron emitter, including: forming a carbon nanotube film; performing densification by dipping the carbon nanotube film in a solvent; cutting an area of the carbon nanotube film into a pointed shape or a line shape; and fixing the cutting area of the carbon nanotube film arranged between at least two metal members to face upwards with lateral pressure.Type: GrantFiled: September 21, 2018Date of Patent: February 18, 2020Assignee: Korea University Research and Business FoundationInventors: Cheol Jin Lee, Sang Heon Lee, Jun-Soo Han
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Patent number: 10529525Abstract: The present disclosure provides a method of manufacturing a carbon nanotube electron emitter, including: forming a carbon nanotube film; performing densification by dipping the carbon nanotube film in a solvent; cutting an area of the carbon nanotube film into a pointed shape or a line shape; and fixing the cutting area of the carbon nanotube film arranged between at least two metal members to face upwards with lateral pressure.Type: GrantFiled: June 26, 2019Date of Patent: January 7, 2020Assignee: Korea University Research and Business FoundationInventors: Cheol Jin Lee, Sang Heon Lee, Jun-Soo Han
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Publication number: 20190318895Abstract: The present disclosure provides a method of manufacturing a carbon nanotube electron emitter, including: forming a carbon nanotube film; performing densification by dipping the carbon nanotube film in a solvent; cutting an area of the carbon nanotube film into a pointed shape or a line shape; and fixing the cutting area of the carbon nanotube film arranged between at least two metal members to face upwards with lateral pressure.Type: ApplicationFiled: June 26, 2019Publication date: October 17, 2019Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin LEE, Sang Heon LEE, Jun-Soo HAN
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Publication number: 20190306963Abstract: The present disclosure relates to an X-ray source apparatus and a control method of the X-ray source apparatus in which a cathode electrode and a gate electrode are arranged in an array form to enable matrix control, and, thus, it is possible to irradiate X-rays at an optimum dose for each position on the subject. Therefore, it is possible to suppress the irradiation of more X-rays than are needed to the subject. Also, it is possible to obtain a high-resolution and high-quality X-ray image. As such, two-dimensional matrix control makes it easy to control the dose of X-rays and makes it possible to uniformly irradiate X-rays to the subject. Therefore, it is possible to manufacture a high-resolution surface X-ray source with less dependence on the size of the focus of electron beams.Type: ApplicationFiled: April 1, 2019Publication date: October 3, 2019Inventors: Cheol Jin LEE, Sang Heon LEE, Jun Soo HAN, Han Bin GO
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Publication number: 20190088437Abstract: The present disclosure provides a method of manufacturing a carbon nanotube electron emitter, including: forming a carbon nanotube film; performing densification by dipping the carbon nanotube film in a solvent; cutting an area of the carbon nanotube film into a pointed shape or a line shape; and fixing the cutting area of the carbon nanotube film arranged between at least two metal members to face upwards with lateral pressure.Type: ApplicationFiled: September 21, 2018Publication date: March 21, 2019Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin LEE, Sang Heon LEE, Jun-Soo HAN
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Patent number: 10049847Abstract: The present disclosure relates to a manufacturing method for an electron emitting device using a graphite adhesive material. A method of preparing paste for forming a cathode of an electron emitting device includes: mixing and dispersing a nanomaterial for electron emission and a graphite filler in a solvent; drying a mixed solution in which the nanomaterial and the graphite filler are mixed; and preparing paste by mixing a graphite binder with the dried mixture.Type: GrantFiled: September 11, 2017Date of Patent: August 14, 2018Assignee: Korea University Research and Business FoundationInventors: Cheol Jin Lee, Dong Hoon Shin, Ki Nam Yun, Yu Ning Sun
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Publication number: 20180012721Abstract: The present disclosure relates to a manufacturing method for an electron emitting device using a graphite adhesive material. A method of preparing paste for forming a cathode of an electron emitting device includes: mixing and dispersing a nanomaterial for electron emission and a graphite filler in a solvent; drying a mixed solution in which the nanomaterial and the graphite filler are mixed; and preparing paste by mixing a graphite binder with the dried mixture.Type: ApplicationFiled: September 11, 2017Publication date: January 11, 2018Applicant: Korea University Research and Business FoundationInventors: Cheol Jin Lee, Dong Hoon Shin, Ki Nam Yun, Yu Ning Sun
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Patent number: 9269522Abstract: An electric field emitting source is equipped with an electron emitting film which comprises a nano-sized electron emitting substance and has a first surface and a second surface constituting the surface opposite thereto, and a cathode which secures one end of the electron emitting film and comprises a first block and a second block respectively corresponding to the first surface and the second surface of the electron emitting film.Type: GrantFiled: January 10, 2014Date of Patent: February 23, 2016Assignee: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin Lee, Dong Hoon Shin, Ji Hong Shin
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Patent number: 9099274Abstract: Described is a lateral field emission device emitting electrons in parallel with respect to a substrate. Electron emission materials having a predetermined thickness are arranged in a direction with respect to the substrate on a supporting portion. An anode is disposed on a side portion of the substrate, the anode corresponding to the electron emission materials.Type: GrantFiled: January 10, 2012Date of Patent: August 4, 2015Assignee: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin Lee, Dong Hoon Shin
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Publication number: 20140191650Abstract: An electric field emitting source is equipped with an electron emitting film which comprises a nano-sized electron emitting substance and has a first surface and a second surface constituting the surface opposite thereto, and a cathode which secures one end of the electron emitting film and comprises a first block and a second block respectively corresponding to the first surface and the second surface of the electron emitting film.Type: ApplicationFiled: January 10, 2014Publication date: July 10, 2014Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin Lee, Dong Hoon Shin, Ji Hong Shin
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Publication number: 20130295815Abstract: Provided are an electron emission source, a display apparatus using the same, an electronic device, and a method of manufacturing the display apparatus. The electron emission source includes a substrate, a cathode separately manufactured from the substrate, and a needle-shaped electron emission material layer, e.g., carbon nanotube (CNT) layer, fixed to the cathode by an adhesive layer. The CNT layer is formed by a suspension filtering method, and electron emission density is increased by a subsequent taping process on the electron emission material layer.Type: ApplicationFiled: July 11, 2013Publication date: November 7, 2013Applicant: KOREA UNIVERSITY INDUSTRIAL & ACADEMIC COLLABORATION FOUNDATIONInventors: Cheol Jin LEE, Seung Il Jung
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Publication number: 20130285009Abstract: Described is a lateral field emission device emitting electrons in parallel with respect to a substrate. Electron emission materials having a predetermined thickness are arranged in a direction with respect to the substrate on a supporting portion. An anode is disposed on a side portion of the substrate, the anode corresponding to the electron emission materials.Type: ApplicationFiled: January 10, 2012Publication date: October 31, 2013Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Cheol Jin Lee, Dong Hoon Shin
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Patent number: 8513870Abstract: Provided are an electron emission source, a display apparatus using the same, an electronic device, and a method of manufacturing the display apparatus. The electron emission source includes a substrate, a cathode separately manufactured from the substrate, and a needle-shaped electron emission material layer, e.g., carbon nanotube (CNT) layer, fixed to the cathode by an adhesive layer. The CNT layer is formed by a suspension filtering method, and electron emission density is increased by a subsequent taping process on the electron emission material layer.Type: GrantFiled: May 29, 2008Date of Patent: August 20, 2013Assignee: Korea University Industrial & Academic Cooperation FoundationInventors: Cheol Jin Lee, Seung Il Jung
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Patent number: 8193692Abstract: Surface field electron emitters using a carbon nanotube yarn and a method of fabricating the same are disclosed. To fabricate the carbon nanotube yarn for use in fabrication of simple and efficient carbon nanotube field electron emitters, the method performs densification of the carbon nanotube yarn during rotation of a plying unit and heat treatment of the carbon nanotube yarn that has passed through the plying unit without using organic or inorganic binders or polymer pastes. The method fabricates the carbon nanotube yarn with excellent homogeneity and reproducibility through a simple process. The carbon nanotube yarn-based surface field electron emitters can be applied to various light emitting devices.Type: GrantFiled: February 19, 2009Date of Patent: June 5, 2012Assignee: Korea University Industrial & Academic Collaboration FoundationInventors: Cheol-Jin Lee, Seung-Il Jung, Guohai Chen
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Patent number: 8137740Abstract: A method of transferring an electronic material and a method of manufacturing an electronic device using the method of transferring the electronic material. The method of transferring the electronic material includes dipping a template, on which an electronic material layer is formed, into a liquid medium, separating the electronic material layer from the template, and floating the electronic material layer on a surface of the liquid medium; raising up the electronic material layer floated on the surface of the liquid medium by using a target substrate and transferring the electronic material layer on the target substrate; and fixing the electronic material layer to the target substrate.Type: GrantFiled: February 4, 2010Date of Patent: March 20, 2012Assignee: Korean University Research and Business FoundationInventors: Cheol Jin Lee, Sun Kug Kim
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Patent number: 7957260Abstract: Disclosed herein are a WiMAX system analyzer having an RAS emulation function and a method of acquiring UL synchronization and testing a PSS. The WiMAX system analyzer includes a clock counter, a D/A conversion unit, an A/D conversion unit, an RF processing unit, switching means, a signal generation unit, a signal analysis unit, and control means. The clock counter creates a frame number. The D/A conversion unit converts a DL sub-frame into an analog signal. The A/D conversion unit converts a UL sub-frame signal into digital data. The RF processing unit RF-modulates the DL sub-frame, outputs the modulated DL sub-frame, and demodulating a modulated UL sub-frame. The switching means connects the RF processing unit to the D/A conversion unit or the A/D conversion unit. The signal generation unit assigns a CID, and creating a DL sub-frame. The signal analysis unit decodes the UL sub-frame, and conducts various analyses.Type: GrantFiled: November 8, 2007Date of Patent: June 7, 2011Assignee: Innowireless Co., Ltd.Inventors: Jinsoup Joung, Kyeong Min Ha, Seung Hwan Ji, Jun Wan Park, Cheol Jin Lee
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Patent number: 7881218Abstract: Disclosed herein is a method of analyzing portable Internet signals in a measuring instrument. The method includes the steps of (a) acquiring synchronization using a preamble included in a currently received frame, (b) acquiring the access parameters of a DL_MAP included in the frame, and checking the validity of the DL_MAP, (c) if, as a result of the check at step (b), the DL_MAP is determined to be valid, acquiring downlink parameters and burst configuration information by interpreting the DL_MAP, and (e) performing a variety of diagnoses, including evaluation of signal quality for each burst, using the parameters and the burst configuration information.Type: GrantFiled: December 19, 2006Date of Patent: February 1, 2011Assignee: Innowireless Co., Ltd.Inventors: Jin Soup Joung, Kyung Min Ha, Cheol Jin Lee