Patents by Inventor Yeon-Suk Choi
Yeon-Suk 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: 20250132078Abstract: A superconducting coil device including a removable winding frame includes an upper flange, a lower flange provided at a position apart from the upper flange, a plurality of connecting rods for connecting the upper flange to the lower flange, an upper fixing plate detachably connected to a top surface of the upper flange, a lower fixing plate detachably connected to a bottom surface of the lower flange, and a winding frame detachably connected between the upper fixing plate and the lower fixing plate, provided to support a wound coil, and detachable from the coil, the upper flange, and the lower flange while the coil is wound.Type: ApplicationFiled: September 27, 2024Publication date: April 24, 2025Inventors: Seunghyun SONG, Yeon Suk CHOI, Yojong CHOI
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Patent number: 11965693Abstract: Disclosed are a helium gas liquefier and a method for liquefying a helium gas. The disclosed helium gas liquefier includes: a first cooling part including a first cooling column; a first cold head installed on the first cooling column, and a first cylinder in which the first cooling column and the first cold head are built; a second cooling part including a second cooling column, a second cold head installed on the second cooling column, and a second cylinder in which the second cooling column and the second cold head are built; and a liquid helium storage disposed under the second cooling part.Type: GrantFiled: December 18, 2020Date of Patent: April 23, 2024Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Myung Su Kim
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Publication number: 20210199377Abstract: Disclosed are a helium gas liquefier and a method for liquefying a helium gas. The disclosed helium gas liquefier includes: a first cooling part including a first cooling column; a first cold head installed on the first cooling column, and a first cylinder in which the first cooling column and the first cold head are built; a second cooling part including a second cooling column, a second cold head installed on the second cooling column, and a second cylinder in which the second cooling column and the second cold head are built; and a liquid helium storage disposed under the second cooling part.Type: ApplicationFiled: December 18, 2020Publication date: July 1, 2021Inventors: Yeon Suk Choi, Myung Su Kim
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Patent number: 10983080Abstract: Disclosed is an apparatus for quantitively supplying a high-viscosity fluid sample, the apparatus including a cylinder body in which a high-viscosity fluid is to be stored, a cylinder head detachably attached to the cylinder body, a piston configured to slide in a longitudinal direction of the cylinder body, and a cutter disposed below the cylinder head and configured to cut a high-viscosity fluid discharged from the cylinder head.Type: GrantFiled: October 16, 2018Date of Patent: April 20, 2021Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Soo Yeol Jeong
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Patent number: 10866023Abstract: Disclosed is an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same. More specifically, gas to be recycled is collected in an adiabatic manner, cooled to a temperature lower than the dew point thereof, and stored in the liquid state through a phase change, thereby saving energy required for re-cooling the gas. Particularly, the present invention relates to an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same, in which recycling gas is compressed through a natural inducement method using a difference in temperature and pressure while being collected and liquefied, thereby reducing noise, vibration, and size of the collector.Type: GrantFiled: January 3, 2019Date of Patent: December 15, 2020Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Seung Young Park, Yeon Suk Choi
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Publication number: 20190137175Abstract: Disclosed is an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same. More specifically, gas to be recycled is collected in an adiabatic manner, cooled to a temperature lower than the dew point thereof, and stored in the liquid state through a phase change, thereby saving energy required for re-cooling the gas. Particularly, the present invention relates to an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same, in which recycling gas is compressed through a natural inducement method using a difference in temperature and pressure while being collected and liquefied, thereby reducing noise, vibration, and size of the collector.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Applicant: Korea Basic Science InstituteInventors: Seung Young Park, Yeon Suk Choi, Min Su Seo, Myung Su Kim
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Publication number: 20190120778Abstract: Disclosed is an apparatus for quantitively supplying a high-viscosity fluid sample, the apparatus including a cylinder body in which a high-viscosity fluid is to be stored, a cylinder head detachably attached to the cylinder body, a piston configured to slide in a longitudinal direction of the cylinder body, and a cutter disposed below the cylinder head and configured to cut a high-viscosity fluid discharged from the cylinder head.Type: ApplicationFiled: October 16, 2018Publication date: April 25, 2019Inventors: Yeon Suk CHOI, Soo Yeol JEONG
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Patent number: 9707624Abstract: Provided is a method of synthesizing silver nanoparticles including: a) a nucleation step of reacting a composition containing a silver precursor, a heterogeneous metal precursor, and an amine-based compound at 30 to 120° C. to form a nucleus; and b) a growth step of reacting the composition containing the nucleus formed therein at 155 to 350° C. to grow the nucleus. According to the present invention, significantly uniform and fine silver nanoparticles may be synthesized with high reproducibility on a large scale.Type: GrantFiled: December 8, 2014Date of Patent: July 18, 2017Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Gaehang Lee, Yeon Suk Choi
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Patent number: 9672303Abstract: The present invention provides a system and method of predicting the initial cooling of a superconducting magnet, which can predict the change in initial cooling temperature of a superconducting magnet when the superconducting magnet is cooled using an ultra-low refrigerator. In the system and method, the change in cooling temperature of a superconducting magnet can be accurately predicted by classifying influence factors related to the cooling of a superconducting magnet into a plurality of control volumes and inducing a governing equation with respect to each of the control volumes. Based on this system and method, the reliability of basic data required to design an apparatus for measuring a high magnetic field for forming an ultralow-temperature environment can be greatly improved.Type: GrantFiled: April 24, 2013Date of Patent: June 6, 2017Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Dong Lak Kim
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Patent number: 9567349Abstract: Provided is a preparing method of an Ag nano-particle for mass-producing Ag nano-particles, the method including: performing a first reaction of a reaction solution containing an Ag precursor and oleylamine at a set first temperature T1; performing a second reaction of the reaction solution at a second temperature T2 set so as to be higher than the first temperature; and obtaining a reactant from the reaction solution, wherein at least one of the first and second reactions is performed in a state in which the reaction solution is not stirred.Type: GrantFiled: February 10, 2014Date of Patent: February 14, 2017Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Gaehang Lee, Yeon Suk Choi, Doo Ri Bae
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Patent number: 9533354Abstract: A method for preparing hydrophobic gold nanoparticles includes adding 1,2-dichlorobenzene as a solvent to gold precursor and using oleylamine and oleic acid with volume ratio of 7.5:2.5 to 5:5 as surfactants. The size of the prepared gold nanoparticles can be controlled over a broad range and may be utilized in various fields such as bio-imaging, photonic crystallization, sensors, organic catalysts, surface enhanced raman spectrum, electronic devices, etc. Further, a method for colorimetric detection of a strong acid uses hydrophilic nanoparticles that are phase transited from the prepared hydrophobic gold nanoparticles. Up to 5 ppm of low content hydrochloric acid can be detected utilizing phase transited hydrophilic nanoparticles in the colorimetric detection method, and the gold nanoparticles that were used in the detection of strong acid can be reused without loss of activity through neutralization with bases.Type: GrantFiled: November 22, 2013Date of Patent: January 3, 2017Assignee: Korea Basic Science InstituteInventors: Gae Hang Lee, Doo Ri Bae, Yeon Suk Choi
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Patent number: 9476615Abstract: Disclosed herein is an autonomous induction heat exchange method using a pressure difference caused by heat exchange in a single pipeline. In addition, the present invention relates to a gas compressor and a heat pump using the method. The present invention does not require a separate drive device. Therefore, occurrence of vibration or noise can be fundamentally prevented. Consumption of power for compressing gas or heat exchange can be minimized. Furthermore, gas circulates in an autonomous induction manner using a pressure difference. Thus, the length, size and structural shape of a gas compressor or a heat pump can be modified in a variety of ways. Thereby, the present invention can be easily used in different kinds of apparatus and systems and can be easily applied to small heat exchange modules using micro-channels as well as large heat exchange systems.Type: GrantFiled: May 30, 2013Date of Patent: October 25, 2016Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Seung Young Park, Yeon Suk Choi
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Publication number: 20160273830Abstract: Disclosed is an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same. More specifically, gas to be recycled is collected in an adiabatic manner, cooled to a temperature lower than the dew point thereof, and stored in the liquid state through a phase change, thereby saving energy required for re-cooling the gas. Particularly, the present invention relates to an adiabatic collector for recycling gas, a liquefier for recycling gas, and a recovery apparatus for recycling gas using the same, in which recycling gas is compressed through a natural inducement method using a difference in temperature and pressure while being collected and liquefied, thereby reducing noise, vibration, and size of the collector.Type: ApplicationFiled: November 12, 2013Publication date: September 22, 2016Inventors: Seung Young Park, Yeon Suk Choi, Min Su Seo, Myung Su Kim
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Patent number: 9448292Abstract: Provided is a cryoprobe using a closed gas loop for a nuclear magnetic resonance apparatus, including: superconducting magnets providing a magnetic field; a rotor rotatably disposed between the superconducting magnets in the state of a sample being put therein, the rotor being rotated by a driving gas; a coil configured to generate a nuclear magnetic resonance spectrum according to a resonance phenomenon of the sample by applying a radio frequency to the rotor; and a gas loop configured to cool the driving gas in a cryogenic condition while circulating it in a closed-loop condition and to supply the driving gas to the rotor, wherein the gas loop supplies the driving gas to the rotor while cooling it in a cryogenic condition, thereby rotating the rotor.Type: GrantFiled: December 16, 2013Date of Patent: September 20, 2016Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Seung Young Park, Sang Gap Lee
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Publication number: 20160121401Abstract: Provided is a method of synthesizing silver nanoparticles including: a) a nucleation step of reacting a composition containing a silver precursor, a heterogeneous metal precursor, and an amine-based compound at 30 to 120° C. to form a nucleus; and b) a growth step of reacting the composition containing the nucleus formed therein at 155 to 350° C. to grow the nucleus. According to the present invention, significantly uniform and fine silver nanoparticles may be synthesized with high reproducibility on a large scale.Type: ApplicationFiled: December 8, 2014Publication date: May 5, 2016Inventors: Gaehang LEE, Yeon Suk CHOI
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Patent number: 9324538Abstract: A coaxial drive apparatus for multidirectional control, including: a housing; a stage pivotally installed in the housing, with the object laid on the stage; a rotary shaft connected to the stage and rotated to cause the stage to pivot; a rotation transmitting unit transmitting a rotating force of the rotary shaft to the stage; a sliding pipe coaxially fitted over the rotary shaft so as to be moved along a lengthwise direction of the rotary shaft or to be rotated on a central axis of the rotary shaft; a moving unit moving the object laid on the stage in the lengthwise direction of the rotary shaft according to a movement of the sliding pipe, and moving the object in a transverse direction of the rotary shaft according to a rotation of the sliding pipe; and a controller providing a driving force to the rotary shaft and to the sliding pipe.Type: GrantFiled: December 16, 2013Date of Patent: April 26, 2016Assignee: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Myung Su Kim, Min-Gab Bog, Jong-Su Jeon, Jong-Gu Kim
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Publication number: 20150143940Abstract: A coaxial drive apparatus for multidirectional control, including: a housing; a stage pivotally installed in the housing, with the object laid on the stage; a rotary shaft connected to the stage and rotated to cause the stage to pivot; a rotation transmitting unit transmitting a rotating force of the rotary shaft to the stage; a sliding pipe coaxially fitted over the rotary shaft so as to be moved along a lengthwise direction of the rotary shaft or to be rotated on a central axis of the rotary shaft; a moving unit moving the object laid on the stage in the lengthwise direction of the rotary shaft according to a movement of the sliding pipe, and moving the object in a transverse direction of the rotary shaft according to a rotation of the sliding pipe; and a controller providing a driving force to the rotary shaft and to the sliding pipe.Type: ApplicationFiled: December 16, 2013Publication date: May 28, 2015Applicant: Korea Basic Science InstituteInventors: Yeon Suk Choi, Myung Su Kim, Min-Gab Bog, Jong-Su Jeon, Jong-Gu Kim
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Publication number: 20150132595Abstract: Provided is a preparing method of an Ag nano-particle for mass-producing Ag nano-particles, the method including: performing a first reaction of a reaction solution containing an Ag precursor and oleylamine at a set first temperature T1; performing a second reaction of the reaction solution at a second temperature T2 set so as to be higher than the first temperature; and obtaining a reactant from the reaction solution, wherein at least one of the first and second reactions is performed in a state in which the reaction solution is not stirred.Type: ApplicationFiled: February 10, 2014Publication date: May 14, 2015Applicant: Korea Basic Science InstituteInventors: Gaehang LEE, Yeon Suk CHOI, Doo Ri BAE
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Publication number: 20150111751Abstract: Provided is a cryoprobe using a closed gas loop for a nuclear magnetic resonance apparatus, including: superconducting magnets providing a magnetic field; a rotor rotatably disposed between the superconducting magnets in the state of a sample being put therein, the rotor being rotated by a driving gas; a coil configured to generate a nuclear magnetic resonance spectrum according to a resonance phenomenon of the sample by applying a radio frequency to the rotor; and a gas loop configured to cool the driving gas in a cryogenic condition while circulating it in a closed-loop condition and to supply the driving gas to the rotor, wherein the gas loop supplies the driving gas to the rotor while cooling it in a cryogenic condition, thereby rotating the rotor.Type: ApplicationFiled: December 16, 2013Publication date: April 23, 2015Applicant: KOREA BASIC SCIENCE INSTITUTEInventors: Yeon Suk Choi, Seung Young Park, Sang Gap Lee
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Publication number: 20140377876Abstract: A method for preparing hydrophobic gold nanoparticles includes adding 1,2-dichlorobenzene as a solvent to gold precursor and using oleylamine and oleic acid with volume ratio of 7.5:2.5 to 5:5 as surfactants. The size of the prepared gold nanoparticles can be controlled over a broad range and may be utilized in various fields such as bio-imaging, photonic crystallization, sensors, organic catalysts, surface enhanced raman spectrum, electronic devices, etc. Further, a method for colorimetric detection of a strong acid uses hydrophilic nanoparticles that are phase transited from the prepared hydrophobic gold nanoparticles. Up to 5 ppm of low content hydrochloric acid can be detected utilizing phase transited hydrophilic nanoparticles in the colorimetric detection method, and the gold nanoparticles that were used in the detection of strong acid can be reused without loss of activity through neutralization with bases.Type: ApplicationFiled: November 22, 2013Publication date: December 25, 2014Applicant: Korea Basic Science InstituteInventors: Gae Hang LEE, Doo Ri BAE, Yeon Suk CHOI