Patents by Inventor Myoung Choul Choi

Myoung Choul 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: 11398375
    Abstract: A mass spectrometry system includes a sample holder provided in a vacuum changer and on which a sample is disposed, an irradiator configured to perform sputtering or ionization on the sample, an analyzer configured to analyze an ionized sample generated from the sample by the irradiator, and a controller configured to control the irradiator or the analyzer and perform a first process and a second process. The first process is to determine position information of materials in the sample by irradiating a laser or ion beam to a portion of the sample, and the second process is to irradiate a laser or ion beam of a first output value to another portion of the sample in a section in which the materials in the sample change and irradiate a laser or ion beam of a second output value in other sections.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: July 26, 2022
    Assignee: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Ji Young Baek, Myoung Choul Choi, Chang Min Choi, Sang Ju Lee, Boo Ki Min
  • Publication number: 20220157554
    Abstract: A mixed gas cluster ion beam generator may include a nozzle chamber to contain a first mixed gas which is a mixed gas that is a mix of a first gas and a second gas, a cluster nozzle to spray gas received from the nozzle chamber in a cluster form, an ionizer to ionize a gas cluster sprayed by the cluster nozzle, and an ion accelerator to emit an ion beam to the outside by accelerating the gas cluster ionized by the ionizer by generating a potential difference to the ionized gas cluster.
    Type: Application
    Filed: November 15, 2021
    Publication date: May 19, 2022
    Inventors: Sang Ju LEE, Myoung Choul CHOI, Chang Min CHOI, Aram HONG, Ji Young BAEK
  • Publication number: 20210090873
    Abstract: A mass spectrometry system includes a sample holder provided in a vacuum changer and on which a sample is disposed, an irradiator configured to perform sputtering or ionization on the sample, an analyzer configured to analyze an ionized sample generated from the sample by the irradiator, and a controller configured to control the irradiator or the analyzer and perform a first process and a second process. The first process is to determine position information of materials in the sample by irradiating a laser or ion beam to a portion of the sample, and the second process is to irradiate a laser or ion beam of a first output value to another portion of the sample in a section in which the materials in the sample change and irradiate a laser or ion beam of a second output value in other sections.
    Type: Application
    Filed: July 24, 2020
    Publication date: March 25, 2021
    Applicant: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Ji Young Baek, Myoung Choul Choi, Chang Min Choi, Sang Ju Lee, Boo Ki Min
  • Patent number: 10699868
    Abstract: Disclosed is a device for generating an organic molecular cluster ion beam, the device including a receiver configured to accommodate an organic material, a cluster generator configured to generate a cluster by supersonic expanding the organic material accommodated in the receiver at a high speed, a photo-ionizer configured to temporarily accommodate the cluster that is generated through the cluster generator, an ultraviolet (UV) light source configured to irradiate an UV pulse to the photo-ionizer to ionize the cluster, and entrance electrodes disposed at both sides of the photo-ionizer and configured to provide a potential difference to the photo-ionizer to generate a cluster ion beam.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: June 30, 2020
    Assignee: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Chang Min Choi, Myoung Choul Choi, Sang Ju Lee, Ji Young Baek, Jeong Jin Kim
  • Publication number: 20200152410
    Abstract: An ion beam generating device includes a liquid metal ion source configured to melt metal and emit an ion beam, and an extractor disposed under the liquid metal ion source and configured to extract the ion beam emitted from the liquid metal ion source. The liquid metal ion source includes a storage configured to accommodate the metal, an emitter configured to receive the metal from the storage and emit the ion beam, and a heater configured to heat the emitter or the storage. The heater is configured to directly heat the metal accommodated in the storage to melt the metal into a liquid state, and an amount of the ion beam to be extracted is controlled by a voltage difference that changes based on a distance between the emitter and the extractor.
    Type: Application
    Filed: October 25, 2019
    Publication date: May 14, 2020
    Inventors: Myoung Choul Choi, Boo Ki Min, Sang Ju Lee, Chang Min Choi, Ji Young Baek, Jae yeong Eo, Il Hee Kim
  • Publication number: 20190355542
    Abstract: Disclosed is a device for generating an organic molecular cluster ion beam, the device including a receiver configured to accommodate an organic material, a cluster generator configured to generate a cluster by supersonic expanding the organic material accommodated in the receiver at a high speed, a photo-ionizer configured to temporarily accommodate the cluster that is generated through the cluster generator, an ultraviolet (UV) light source configured to irradiate an UV pulse to the photo-ionizer to ionize the cluster, and entrance electrodes disposed at both sides of the photo-ionizer and configured to provide a potential difference to the photo-ionizer to generate a cluster ion beam.
    Type: Application
    Filed: November 9, 2018
    Publication date: November 21, 2019
    Applicant: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Chang Min CHOI, Myoung Choul CHOI, Sang Ju LEE, Ji Young BAEK, Jeong Jin KIM
  • Patent number: 10209220
    Abstract: Provided are an apparatus for measuring an ionic mobility of a harmful material and a reference data obtaining method thereof. The method includes obtaining a measurement signal by detecting a charge of an ion between electrodes, obtaining a noise signal by insulating the electrodes from the ion, aligning the noise signal with the measurement signal, removing a part of the measurement signal aligned with the noise signal, and calculating reference data from a remaining part of the measurement signal.
    Type: Grant
    Filed: November 26, 2015
    Date of Patent: February 19, 2019
    Assignee: Korea Basic Science Institute
    Inventors: Myoung Choul Choi, Jeong-Hoon Kang, Jung-Hwan Kim
  • Publication number: 20180275098
    Abstract: Provided are an apparatus for measuring an ionic mobility of a harmful material and a reference data obtaining method thereof. The method includes obtaining a measurement signal by detecting a charge of an ion between electrodes, obtaining a noise signal by insulating the electrodes from the ion, aligning the noise signal with the measurement signal, removing a part of the measurement signal aligned with the noise signal, and calculating reference data from a remaining part of the measurement signal.
    Type: Application
    Filed: November 26, 2015
    Publication date: September 27, 2018
    Inventors: Myoung Choul CHOI, Jeong-Hoon KANG, Jung-Hwan KIM
  • Patent number: 9129784
    Abstract: A Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) includes: an ionization source generating ions; a deceleration lens, on which the ions generated by the ionization source and spatially dispersed are incident, selectively decelerating the incident ions so as to decrease the distance between the ions; and an ion cyclotron resonance cell on which the ions passing through the deceleration lens are incident. By preventing dispersing of ions due to mass difference and converging the ions using the deceleration lens, the mass range that can be measured at one time can be extended. Also, measurement sensitivity can be improved since the ions are effectively introduced to the ICR cell.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: September 8, 2015
    Assignee: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Myoung Choul Choi, A Leum Park, Hyun Sik Kim, Seung Yong Kim, Jong Shin Yoo
  • Patent number: 9129788
    Abstract: A lens for electron capture dissociation may include: a first electrode and a second electrode spaced apart from each other and arranged along a first direction; and a third electrode and a fourth electrode spaced apart from each other and arranged along a second direction perpendicular to the first direction. The first electrode and the second electrode may be disposed in a space in which a magnetic field is formed in the first direction and trap electrons. The third electrode and the fourth electrode may be in the form of a flat plate and may apply an electric field to the trapped electrons in the second direction.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: September 8, 2015
    Assignee: Korea Basic Science Institute
    Inventors: Myoung Choul Choi, Sang Hwan Choi, Se Gyu Lee, Jeong Min Lee
  • Publication number: 20140284470
    Abstract: A lens for electron capture dissociation may include: a first electrode and a second electrode spaced apart from each other and arranged along a first direction; and a third electrode and a fourth electrode spaced apart from each other and arranged along a second direction perpendicular to the first direction. The first electrode and the second electrode may be disposed in a space in which a magnetic field is formed in the first direction and trap electrons. The third electrode and the fourth electrode may be in the form of a flat plate and may apply an electric field to the trapped electrons in the second direction.
    Type: Application
    Filed: October 10, 2012
    Publication date: September 25, 2014
    Inventors: Myoung Choul Choi, Sang Hwan Choi, Se Gyu Lee, Jeong Min Lee
  • Patent number: 8723112
    Abstract: Provided are a controller and a control method for improving signal performance of an ion cyclotron resonance mass spectrometer. The controller and control method apply electric signals for causing ions injected into an ion trap of the ion cyclotron resonance mass spectrometer to be injected to the center of the trap as close as possible to trap electrodes, and adjust biased ion motion by appropriately adjusting signals of trap electrodes for causing the injected ions to make ion motion, thereby improving the fidelity of ion signals. The control method for improving signal performance of an ion cyclotron resonance mass spectrometer includes an ion position adjustment process and an ion signal detection process.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: May 13, 2014
    Assignee: Korea Basic Science Institute
    Inventors: Seung Yong Kim, Hyun Sik Kim, Myoung Choul Choi, Jong Shin Yoo
  • Publication number: 20130228681
    Abstract: A Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) includes: an ionization source generating ions; a deceleration lens, on which the ions generated by the ionization source and spatially dispersed are incident, selectively decelerating the incident ions so as to decrease the distance between the ions; and an ion cyclotron resonance cell on which the ions passing through the deceleration lens are incident. By preventing dispersing of ions due to mass difference and converging the ions using the deceleration lens, the mass range that can be measured at one time can be extended. Also, measurement sensitivity can be improved since the ions are effectively introduced to the ICR cell.
    Type: Application
    Filed: November 21, 2011
    Publication date: September 5, 2013
    Applicant: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Myoung Choul Choi, A Leum Park, Hyun Sik Kim, Seung Yong Kim, Jong Shin Yoo
  • Patent number: 8513596
    Abstract: An apparatus for electrospray ionization may include: a platform including an inlet port, a first channel connected to the inlet port, a second channel connected to the first channel, and an outlet port connected to the second channel; a nebulizer provided in the first channel and configured to spray inert gas to a sample sprayed into the first channel through the inlet port; and a focusing lens provided in the second channel and configured to focus ions produced from the sprayed sample toward the outlet port.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: August 20, 2013
    Assignee: Korea Basic Science Institute
    Inventors: Duk Jin Kang, Myoung Choul Choi, Jong Shin Yoo, Hyun Sik Kim
  • Patent number: 8440966
    Abstract: A Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) is provided. A preamplifier is installed as nearest to an ion cyclotron resonance (ICR) trap as possible at a detector part in the mass spectrometer, and thermal noise generated at the preamplifier is minimized by means of a cryo-cooling system to increase a signal-to-noise ratio of ion detection signals such that an ultra-low amount of specimen can be detected, which was impossible in the related art.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: May 14, 2013
    Assignee: Korea Basic Science Institute
    Inventors: Myoung Choul Choi, Yeon Suk Choi, Jeong Min Lee, Seung Yong Kim, Dong Lak Kim, Hyun Sik Kim, Jong Shin Yoo, Stefan Karl-Heinz Stahl
  • Publication number: 20130112864
    Abstract: Provided are a controller and a control method for improving signal performance of an ion cyclotron resonance mass spectrometer. The controller and control method apply electric signals for causing ions injected into an ion trap of the ion cyclotron resonance mass spectrometer to be injected to the center of the trap as close as possible to trap electrodes, and adjust biased ion motion by appropriately adjusting signals of trap electrodes for causing the injected ions to make ion motion, thereby improving the fidelity of ion signals. The control method for improving signal performance of an ion cyclotron resonance mass spectrometer includes an ion position adjustment process and an ion signal detection process.
    Type: Application
    Filed: October 31, 2011
    Publication date: May 9, 2013
    Applicant: Korea Basic Science Institute
    Inventors: Seung Yong Kim, Hyun Sik Kim, Myoung Choul Choi, Jong Shin Yoo
  • Publication number: 20120049082
    Abstract: An apparatus for electrospray ionization may include: a platform including an inlet port, a first channel connected to the inlet port, a second channel connected to the first channel, and an outlet port connected to the second channel; a nebulizer provided in the first channel and configured to spray inert gas to a sample sprayed into the first channel through the inlet port; and a focusing lens provided in the second channel and configured to focus ions produced from the sprayed sample toward the outlet port.
    Type: Application
    Filed: December 23, 2010
    Publication date: March 1, 2012
    Applicant: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Duk Jin Kang, Myoung Choul Choi, Jong Shin Yoo, Hyun Sik Kim
  • Publication number: 20110114834
    Abstract: A high throughput apparatus for multiple sample analysis is disclosed. The high throughput apparatus for multiple sample analysis may include: a laser light source; a lens array configured to focus laser irradiated by the laser light source into a plurality of focused laser beams; and a focusing unit disposed between the lens array and a sample, the focusing unit configured to focus ions produced from the sample by the plurality of focused laser beams into a plurality of ion beams. A high throughput method for multiple sample analysis may include: producing a plurality of focused laser beams by focusing laser; ionizing a sample by irradiating the plurality of focused laser beams to the sample; and producing a plurality of ion beams by focusing ions, wherein the ions are produced from the sample by the plurality of focused laser beams.
    Type: Application
    Filed: November 17, 2010
    Publication date: May 19, 2011
    Applicant: KOREA BASIC SCIENCE INSTITUTE
    Inventors: Myoung Choul Choi, Hyun Sik Kim, Jong Shin Yoo, Geon Hee Kim, Ki Soo Chang
  • Patent number: 7939799
    Abstract: A tandem Fourier transform ion cyclotron resonance mass spectrometer is provided. In the mass spectrometer, the ions selected by a FT-ICR mass analyzer, which can perform an ion selection process and a mass measurement process with a time interval between the processes, are transmitted through an ion guide to a collision cell, which is located a predetermined distance from the FT-ICR mass analyzer, to split into fragment ions. The fragment ions are transmitted to the FT-ICR mass analyzer that measures the mass of the fragment ions. The fragment ions are generated in the collision cell 60 established separately from the FT-ICR mass analyzer 40 according to the mass spectrometer. Accordingly, It can solve various problems (e.g., the radius reduction of cyclotron motion of colliding ions, or the removal of periphery gas after generating the fragment ions) occurred in a tandem mass spectrometer using a conventional tandem-in-time mass analysis method.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: May 10, 2011
    Assignee: Korea Basic Science Institute
    Inventors: Hyun Sik Kim, Myoung Choul Choi, Jong Shin Yoo
  • Patent number: 7755039
    Abstract: A differential pumping system in which a vacuum chamber is manufactured to have a plurality of vacuum pumps and conductance limit plates between the vacuum pumps. The differential pumping system in which an ion is implanted from an ionization source, passes through the vacuum chamber and is detected by a detection unit includes a plurality of vacuum pumps in the vacuum chamber and one or more conductance limit plates between the vacuum pumps, and the conductance limit plates form an angle less than 90° with the transmission direction of the ion. According to such a constitution, higher degree of vacuum and the ion transmission efficiency are maintained without increasing the length of the vacuum chamber. Furthermore, it is possible to minimize the attenuation of an ion detection signal due to a collision with a neighboring neutral molecule, improving the sensitivity of an ion detection device.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: July 13, 2010
    Assignee: Korea Basic Science Institute
    Inventors: Myoung Choul Choi, Jong Shin Yoo, Hyun Sik Kim