Patents by Inventor Yo-Han Choi
Yo-Han 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).
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Publication number: 20240127710Abstract: Disclosed are a system and method for automatically evaluating an essay. The system includes a structure analysis module configured to divide learning data and learner essay text in a predetermined structure analysis unit, generate structure tagging information for each structure analysis unit, and structure the learning data and the learner essay text by attaching the structure tagging information to the learning data and the learner essay text, a learning module configured to generate an essay evaluation model through learning by using essay text that is included in the structured learning data and the structure tagging information as an input value and using an evaluation score that is included in the structured learning data as a label, and an evaluation module configured to generate essay evaluation results using the essay evaluation model.Type: ApplicationFiled: April 18, 2023Publication date: April 18, 2024Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Minsoo CHO, Oh Woog KWON, Yoon-Hyung ROH, Ki Young LEE, Yo Han LEE, Sung Kwon CHOI, Jinxia HUANG
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Publication number: 20230061904Abstract: Provided is a gene amplification apparatus. The gene amplification apparatus includes a supply roller, a roll-type film chip which has a plurality of polymerase chain reaction (PCR) chambers, with which PCR samples are filled, and is wound around the supply roller, a heating roller configured to rotate after being pressed against the film chip and then induce a PCR, a plurality of heating blocks which are disposed on a circumferential surface of the heating roller at preset intervals and brought into contact with the film chip, and a discarding roller configured to discard the film chip which passes the heating roller and on which the PCR is performed.Type: ApplicationFiled: February 4, 2022Publication date: March 2, 2023Inventors: Kwang Hyo CHUNG, Hyo Jeong AN, Han Young YU, Yo Han CHOI
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Patent number: 11434191Abstract: Disclosed is a method for preparing methyl methacrylate (MMA), the method including: (1) separating isobutene containing saturated hydrocarbon (n-butane and iso-butane), via a catalytic distillation process from a stream of C4 hydrocarbons containing butadiene, n-butene, and isobutene; (2) producing methacrolein via a first oxidation reaction of the separated isobutene; (3) producing methacrylic acid via a second oxidation reaction of the produced methacrolein; and (4) esterifying the produced methacrylic acid with methanol. By having a high heat capacity, the amount of nitrogen added is minimized to reduce the size of the reactor and the amount of gas production at a rear end, which has a high economic feasibility due to the effect of reducing investment and investment cost.Type: GrantFiled: October 21, 2020Date of Patent: September 6, 2022Assignee: Hanwha Total Petrochemical Co., Ltd.Inventors: Hyun Chul Choi, Ho Sik Chang, Jin Suk Lee, Yo Han Choi
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Patent number: 11025269Abstract: According to an exemplary embodiment, a capacitively coupled continuous-time delta-sigma modulator includes an instrumentation amplifier amplifying an input voltage to an output voltage of a predetermined magnitude, a delta-sigma modulator outputting a bit signal quantized depending on a sampling frequency based on the output voltage and to convert the bit signal into a digital-to-analog conversion voltage, and a ripple reduction loop unit generating a demodulation voltage, in which a ripple is removed from the output voltage, depending on an RRL operating frequency to feed the demodulation voltage back to the instrumentation amplifier. The RRL operating frequency is equal to the sampling frequency.Type: GrantFiled: May 11, 2020Date of Patent: June 1, 2021Assignee: Korea University Research and Business FoundationInventors: Chulwoo Kim, Chae Kang Lim, Yo Han Choi
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Patent number: 10921249Abstract: According to the present invention, an optical differential interrogation method for surface plasmon resonance imaging including: letting first incident light of a first wavelength and second incident light of a second wavelength to be incident on a sample while varying an incident angle; detecting intensity of first reflection light of the first incident light and intensity of second reflection light of the second incident light; and identifying the sample by using a difference between the intensity of the first reflection light and the intensity of the second reflection light, can be provided, and thus it is possible to obtain much better angular resolution while using a detector or a camera, which has a relative low receiving sensitivity and a sensor chip where samples having various characteristics are two-dimensionally arrayed and integrated can be effectively measured.Type: GrantFiled: July 9, 2019Date of Patent: February 16, 2021Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Jong Deog Kim, Yo Han Choi
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Publication number: 20200366311Abstract: According to an exemplary embodiment, a capacitively coupled continuous-time delta-sigma modulator includes an instrumentation amplifier amplifying an input voltage to an output voltage of a predetermined magnitude, a delta-sigma modulator outputting a bit signal quantized depending on a sampling frequency based on the output voltage and to convert the bit signal into a digital-to-analog conversion voltage, and a ripple reduction loop unit generating a demodulation voltage, in which a ripple is removed from the output voltage, depending on an RRL operating frequency to feed the demodulation voltage back to the instrumentation amplifier. The RRL operating frequency is equal to the sampling frequency.Type: ApplicationFiled: May 11, 2020Publication date: November 19, 2020Applicant: Korea University Research and Business FoundationInventors: Chulwoo KIM, Chae Kang LIM, Yo Han CHOI
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Patent number: 10718759Abstract: Disclosed herein are a transparent immunoassay apparatus and method. The transparent immunoassay apparatus includes a sample pad configured to allow a liquid specimen to be dropped thereonto, a first porous pipe configured to move the dropped specimen in a lateral flow manner, an immunobinding reaction unit configured to generate a detectable signal from binding of a previously applied reactant and the specimen between transparent upper and lower plates of the immunobinding reaction unit, a second porous pipe configured to move the specimen, having passed through the immunobinding reaction unit, in a lateral flow manner, and an absorption pad configured to absorb the specimen transferred from the second porous pipe.Type: GrantFiled: June 5, 2017Date of Patent: July 21, 2020Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Yo-Han Choi, Ki-Bong Song
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Publication number: 20200011790Abstract: According to the present invention, an optical differential interrogation method for surface plasmon resonance imaging including: letting first incident light of a first wavelength and second incident light of a second wavelength to be incident on a sample while varying an incident angle; detecting intensity of first reflection light of the first incident light and intensity of second reflection light of the second incident light; and identifying the sample by using a difference between the intensity of the first reflection light and the intensity of the second reflection light, can be provided, and thus it is possible to obtain much better angular resolution while using a detector or a camera, which has a relative low receiving sensitivity and a sensor chip where samples having various characteristics are two-dimensionally arrayed and integrated can be effectively measured.Type: ApplicationFiled: July 9, 2019Publication date: January 9, 2020Inventors: Jong Deog KIM, Yo Han CHOI
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Patent number: 10164443Abstract: Disclosed is a method of controlling frequency of a power system by which a frequency of a power system is regulated using high-speed charging and discharging characteristics of a plurality of energy storage systems (ESSs) and a battery state of charge (SOC), the method including: an operation of comparing, by a control unit, first time information and second time information and performing an exit control mode when the first time information (Before_Exit_time) is equal to or less than the second time information (After_Exit_time); an operation of determining, the control unit, an output amount for each ESS for discharging batteries using a battery discharging amount determining function (Exit_control_output( ) function) when a first parameter value (D_time) preset in the exit control mode is a positive value greater than zero and the second time information (After_Exit_time) is equal to or less than a second parameter value (Clear_time); and an operation of discharging, by the control unit, batteries until tType: GrantFiled: November 8, 2016Date of Patent: December 25, 2018Assignee: KOREA ELECTRIC POWER CORPORATIONInventors: Geon Pyo Lim, Soo Yeol Kim, Chan Wook Park, Yo Han Choi, Seung Han Kim, Doo Yong Park, Yong Beum Yoon
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Patent number: 10138513Abstract: Provided is a gene amplifying and detecting device. The gene amplifying and detecting device includes: a gene amplifying chip including a chamber formed therein; a reaction solution filled in the chamber and including a fluorescent material; a light source located at one side of the gene amplifying chip; a light detector located at the other side of the gene amplifying chip; and a graphene heater formed on an inner surface or outer surface of the gene amplifying chip so as to heat the reaction solution.Type: GrantFiled: November 26, 2014Date of Patent: November 27, 2018Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kwang Hyo Chung, Jin Tae Kim, Yo Han Choi, Choon Gi Choi, Hong Kyw Choi, Young Jun Yu, Doo Hyeb Youn, Jin Sik Choi
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Patent number: 10048260Abstract: A Positional Scanning-Synthetic Peptide Combinatorial Library (PS-SPC) searching apparatus and method using Surface Plasmon Resonance (SPR) are provided. The method includes spotting and fixing each of a plurality of peptide pools to a top of one thin metal film, inputting specific materials to the top of the thin metal film, applying a TM-mode light to a bottom of the thin metal film and exciting SPR for the thin metal film, and detecting a TM mode reflected light reflected from the thin metal film and displaying the detected light as a two-dimensional image.Type: GrantFiled: November 6, 2013Date of Patent: August 14, 2018Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Yo Han Choi, Moon Youn Jung, Seon Hee Park
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Publication number: 20180131199Abstract: Disclosed is a method of controlling frequency of a power system by which a frequency of a power system is regulated using high-speed charging and discharging characteristics of a plurality of energy storage systems (ESSs) and a battery state of charge (SOC), the method including: an operation of comparing, by a control unit, first time information and second time information and performing an exit control mode when the first time information (Before_Exit_time) is equal to or less than the second time information (After_Exit_time); an operation of determining, the control unit, an output amount for each ESS for discharging batteries using a battery discharging amount determining function (Exit_control_output( ) function) when a first parameter value (D_time) preset in the exit control mode is a positive value greater than zero and the second time information (After_Exit_time) is equal to or less than a second parameter value (Clear_time); and an operation of discharging, by the control unit, batteries until tType: ApplicationFiled: November 8, 2016Publication date: May 10, 2018Inventors: Geon Pyo LIM, Soo Yeol KIM, Chan Wook PARK, Yo Han CHOI, Seung Han KIM, Doo Yong PARK, Yong Beum YOON
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Publication number: 20180100852Abstract: Disclosed herein are a transparent immunoassay apparatus and method. The transparent immunoassay apparatus includes a sample pad configured to allow a liquid specimen to be dropped thereonto, a first porous pipe configured to move the dropped specimen in a lateral flow manner, an immunobinding reaction unit configured to generate a detectable signal from binding of a previously applied reactant and the specimen between transparent upper and lower plates of the immunobinding reaction unit, a second porous pipe configured to move the specimen, having passed through the immunobinding reaction unit, in a lateral flow manner, and an absorption pad configured to absorb the specimen transferred from the second porous pipe.Type: ApplicationFiled: June 5, 2017Publication date: April 12, 2018Inventors: Yo-Han CHOI, Ki-Bong SONG
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Patent number: 9931307Abstract: Provided is a transdermal delivery system consisting of a backing layer, a drug-containing matrix layer, and a release layer, wherein the drug-containing matrix layer includes (a) donepezil or a pharmaceutically acceptable salt thereof as an active ingredient, (b) a mixture of high molecular weight polyisobutylene having a weight-average molecular weight ranging from 400,000 to 3,000,000 and low molecular weight polyisobutylene having a weight-average molecular weight ranging from 25,000 to 300,000 as an adhesive, and (c) a permeation enhancer in not more than 3% by weight based on the total weight of the drug-containing matrix layer.Type: GrantFiled: January 12, 2015Date of Patent: April 3, 2018Assignee: DAEWOONG PHARMACEUTICAL CO., LTD.Inventors: Yo-Han Choi, Hee-Chul Chang
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Publication number: 20160060681Abstract: Provided is a gene amplifying and detecting device. The gene amplifying and detecting device includes: a gene amplifying chip including a chamber formed therein; a reaction solution filled in the chamber and including a fluorescent material; a light source located at one side of the gene amplifying chip; a light detector located at the other side of the gene amplifying chip; and a graphene heater formed on an inner surface or outer surface of the gene amplifying chip so as to heat the reaction solution.Type: ApplicationFiled: November 26, 2014Publication date: March 3, 2016Applicant: Electronics and Telecommunications Research InstituteInventors: Kwang Hyo CHUNG, Jin Tae KIM, Yo Han CHOI, Choon Gi CHOI, Hong Kyw CHOI, Young Jun YU, Doo Hyeb YOUN, Jin Sik CHOI
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Publication number: 20160051486Abstract: Provided is a transdermal delivery system consisting of a backing layer, a drug-containing matrix layer, and a release layer, wherein the drug-containing matrix layer includes (a) donepezil or a pharmaceutically acceptable salt thereof as an active ingredient, (b) a mixture of high molecular weight polyisobutylene having a weight-average molecular weight ranging from 400,000 to 3,000,000 and low molecular weight polyisobutylene having a weight-average molecular weight ranging from 25,000 to 300,000 as an adhesive, and (c) a permeation enhancer in not more than 3% by weight based on the total weight of the drug-containing matrix layer.Type: ApplicationFiled: January 12, 2015Publication date: February 25, 2016Applicant: DAEWOONG PHARMACEUTICAL CO., LTD.Inventors: Yo-Han CHOI, Hee-Chul CHANG
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Patent number: 8834811Abstract: Provided are a device for storing a reagent capable of being adhered to a biochip and supplying the stored reagent to the biochip, and a method of discharging a reagent thereof. The device for storing a reagent includes an elastic film pressurizing part configured to pressurize an elastic film by magnetic force, and a reagent discharging part configured to store the reagent and discharge the reagent through an outlet by using the deformation in the elastic film due to the pressurization. According to the present invention, a magnetic force controlling device can be small-sized and the reagent can be automatically, high-precisely, and reproducibly supplied through the magnetic force control.Type: GrantFiled: June 20, 2012Date of Patent: September 16, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Kwang Hyo Chung, Yo Han Choi, Jong Heon Yang, Chan Woo Park, Chil Seong Ah, Wan Joong Kim, Gun Yong Sung
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Patent number: 8728312Abstract: Disclosed are a method and an apparatus for filtering plasma using magnetic force. The apparatus for filtering plasma using magnetic force includes: an inlet into which blood is injected; a filter unit filtering plasma in the blood passing through the inlet by capillary force; a magnetic force receiving part made of magnetizable materials and assisting plasma filtering by applying pressure to the filter unit by movement due to magnetic force generated from the outside; an outlet discharging plasma filtered from blood; and a filter outer body surrounding the inlet, the filter unit, the magnetic receiving part, and the outlet.Type: GrantFiled: October 31, 2011Date of Patent: May 20, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Kwang Hyo Chung, Yo Han Choi, Chang-Geun Ahn, Gun Yong Sung
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Publication number: 20140066331Abstract: A Positional Scanning-Synthetic Peptide Combinatorial Library (PS-SPC) searching apparatus and method using Surface Plasmon Resonance (SPR) are provided. The method includes spotting and fixing each of a plurality of peptide pools to a top of one thin metal film, inputting specific materials to the top of the thin metal film, applying a TM-mode light to a bottom of the thin metal film and exciting SPR for the thin metal film, and detecting a TM mode reflected light reflected from the thin metal film and displaying the detected light as a two-dimensional image.Type: ApplicationFiled: November 6, 2013Publication date: March 6, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Yo Han CHOI, Moon Youn JUNG, Seon Hee PARK
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Patent number: 8585013Abstract: There is provided a magnetic microvalve using a metal ball and a method of manufacturing the same. A magnetic microvalve using a metal ball according to an aspect of the invention may include: an upper substrate having a microchannel serving as a passage through which a fluid moves, a fluid inlet through which the fluid flows into the microchannel, and a fluid outlet through which the fluid, having passed through the microchannel, flows out of the microchannel; a lower substrate having a trench locally provided therein; a PDMS/metal ball combination having a metal ball and PDMS surrounding the metal ball so that the metal ball is located in a central portion thereof, the PDMS/metal ball combination being inserted into the trench provided in the lower substrate; and a magnet located above the microchannel, provided in the upper substrate, and generating magnetic force.Type: GrantFiled: August 31, 2010Date of Patent: November 19, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Kwang Hyo Chung, Yo Han Choi, Dae Sik Lee, Young Jun Kim, Moon Youn Jung, Seon Hee Park