Patents by Inventor Ho-Jun Chang

Ho-Jun Chang 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).

  • Publication number: 20210137445
    Abstract: An apparatus for estimating a skin barrier function or transepidermal water loss of an object may include a spectrum acquisition assembly configured to obtain a Raman spectrum of the object, and a processor configured to extract one or more Type-1 Raman band spectra related to lipids from the obtained Rama spectrum; extract one or more Type-2 Raman band spectra related to lipids and proteins from the obtained Raman spectrum; extract respective features of each of the extracted one or more Type-1 Raman band spectra and the extracted one or more Type-2 Raman band spectra; and estimate the skin barrier function or the transepidermal rater loss of the object based on the extracted features.
    Type: Application
    Filed: April 16, 2020
    Publication date: May 13, 2021
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun S PARK, Woochang LEE, Ho Jun CHANG, Eui Seok SHIN
  • Patent number: 10983001
    Abstract: A Raman probe includes: a light source configured to emit light onto an object; a light collector configured to collect Raman-scattered light from the object by reflecting the Raman-scattered light, the light collector including a light incident port, a light emitting port, and a reflective surface including a light incident port portion and a light emitting port portion, a slope of the light incident port portion with respect to an optical axis of the light collector being smaller than a slope of the light emitting port portion with respect to the optical axis; a condenser lens configured to collect the Raman-scattered light collected by the light collector; and a photodetector configured to detect the Raman-scattered light collected by the condenser lens.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: April 20, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Ho Jun Chang
  • Publication number: 20210041365
    Abstract: Provided is an apparatus for measuring particulate matter including an image obtaining device configured to charge particulate matter particles included in air that is introduced to the image obtaining device, and to obtain an image of the charged particulate matter particles based on lens-free imaging, a spectrum obtaining device configured to obtain a Raman spectrum of the charged particulate matter particles, and a processor configured to determine a size of the particulate matter particles and a concentration of the particulate matter particles based on the obtained image, and to determine components of the particulate matter particles based on the obtained Raman spectrum.
    Type: Application
    Filed: March 16, 2020
    Publication date: February 11, 2021
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: WOO CHANG LEE, YUN S PARK, HO JUN CHANG, SUNG HYUN NAM
  • Publication number: 20210025802
    Abstract: Provided is an apparatus for measuring particulate matter, the apparatus including an air inflow device configured to receive air including particulate matter particles, two or more light sources configured to respectively emit light of different wavelengths to the air received, a pattern measuring device configured to measure scattering patterns for each wavelength of light based on detecting light that is forward-scattered by the particulate matter particles and light that is back-scattered by the particulate matter particles, and a processor configured to obtain a size of the particulate matter particles and a concentration of the particulate matter particles based on the scattering patterns for each wavelength of light.
    Type: Application
    Filed: March 16, 2020
    Publication date: January 28, 2021
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ho Jun Chang, Yun S Park, Woo Chang Lee
  • Publication number: 20200397353
    Abstract: An apparatus for measuring a Raman spectrum may include a processor configured to adjust a Raman probe parameter, set a Raman probe with the Raman probe parameter, obtain a first Raman spectrum of the sample at a first time point and a second Raman spectrum of the sample at a second time point, obtain a difference spectrum between the first Raman spectrum and the second Raman spectrum, determine a degree of similarity between the difference spectrum and an analyte Raman spectrum, determine an optimal Raman probe parameter based on the degree of similarity, and obtain a Raman spectrum of the sample for measuring bio-information by setting the Raman probe with the optimal Raman probe parameter.
    Type: Application
    Filed: March 12, 2020
    Publication date: December 24, 2020
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun S PARK, Woo Chang LEE, Ho Jun CHANG
  • Patent number: 10684226
    Abstract: A Raman probe provided includes a light source part configured to emit light on a sample, and further configured to adjust at least one of an incident angle of the light, a position of an emission point of the light, and a focal point of the light source part, a light collector configured to collect Raman scattered light from the sample, and further configured to adjust a field of view of Raman measurement and a focal point of the light collector, and a photodetector configured to receive the collected Raman scattered light, wherein the light source part comprises a reflection mirror configured to rotate to adjust the position of the emission point of the light.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: June 16, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ho Jun Chang, Woo Chang Lee
  • Patent number: 10680593
    Abstract: A delay locked loop circuit includes a duty detector configured to detect a duty cycle of a clock signal, and to determine whether to perform a coarse duty cycle correction based on the detected duty, and a delay locked loop core. The delay locked loop core is configured to selectively perform the coarse duty cycle correction for the clock signal according to the determination of the duty detector, perform a coarse lock for the clock signal during a first time period different from a second time period in which the coarse duty cycle correction is performed, and perform a fine duty cycle correction and a fine lock for the clock signal.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: June 9, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Kyeom Kim, Won-Joo Yun, SukYong Kang, Ho-Jun Chang
  • Patent number: 10663405
    Abstract: Provided are a Raman probe and a bio-component analyzing apparatus using the same. The Raman probe according to an embodiment of the present disclosure may include: a probe head having a concave part configured to receive skin of an object being inserted into the concave part when the probe head comes into contact with the skin of the object; a light source part configured to emit light onto the skin inserted into the concave part; and a light collector formed above the concave part and configured to collect Raman scattered light from the skin inserted into the concave part. The light source part may be disposed on a side of at least one of the light collector and the concave part.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: May 26, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Woochang Lee, Ho Jun Chang
  • Patent number: 10627290
    Abstract: A spectral image correcting apparatus includes: an image acquirer configured to acquire a spectral image; and a processor configured to detect a peak wavelength corresponding to a characteristic wavelength based on a differential value of a spectrum of the spectral image, and correct a curvature of the spectral image based on the detected peak wavelength.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: April 21, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun S Park, Ho Jun Chang
  • Publication number: 20200046269
    Abstract: A apparatus for estimating concentration may include: a spectrum obtainer configured to obtain Raman spectra of an object; and a processor configured to extract, from the Raman spectra, at least one analyte spectrum related to an analyte and at least one non-analyte spectrum related to a biological component other than the analyte, and estimate concentration of the analyte based on a first area under a curve of the at least one analyte spectrum and a second area under a curve of the at least one non-analyte spectrum.
    Type: Application
    Filed: July 31, 2019
    Publication date: February 13, 2020
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun S. PARK, Sung Hyun NAM, Woo Chang LEE, Ho Jun CHANG
  • Publication number: 20200041338
    Abstract: A Raman probe includes: a light source configured to emit light onto an object; a light collector configured to collect Raman-scattered light from the object by reflecting the Raman-scattered light, the light collector including a light incident port, a light emitting port, and a reflective surface including a light incident port portion and a light emitting port portion, a slope of the light incident port portion with respect to an optical axis of the light collector being smaller than a slope of the light emitting port portion with respect to the optical axis; a condenser lens configured to collect the Raman-scattered light collected by the light collector; and a photodetector configured to detect the Raman-scattered light collected by the condenser lens.
    Type: Application
    Filed: July 30, 2019
    Publication date: February 6, 2020
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Ho Jun CHANG
  • Publication number: 20190391015
    Abstract: A spectral image correcting apparatus includes: an image acquirer configured to acquire a spectral image; and a processor configured to detect a peak wavelength corresponding to a characteristic wavelength based on a differential value of a spectrum of the spectral image, and correct a curvature of the spectral image based on the detected peak wavelength.
    Type: Application
    Filed: October 26, 2018
    Publication date: December 26, 2019
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yun S PARK, Ho Jun CHANG
  • Publication number: 20190277764
    Abstract: A Raman probe provided includes a light source part configured to emit light on a sample, and further configured to adjust at least one of an incident angle of the light, a position of an emission point of the light, and a focal point of the light source part, a light collector configured to collect Raman scattered light from the sample, and further configured to adjust a field of view of Raman measurement and a focal point of the light collector, and a photodetector configured to receive the collected Raman scattered light, wherein the light source part comprises a reflection mirror configured to rotate to adjust the position of the emission point of the light.
    Type: Application
    Filed: March 8, 2019
    Publication date: September 12, 2019
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ho Jun Chang, Woo Chang Lee
  • Publication number: 20190257761
    Abstract: Provided are a Raman probe and a bio-component analyzing apparatus using the same. The Raman probe according to an embodiment of the present disclosure may include: a probe head having a concave part configured to receive skin of an object being inserted into the concave part when the probe head comes into contact with the skin of the object; a light source part configured to emit light onto the skin inserted into the concave part; and a light collector formed above the concave part and configured to collect Raman scattered light from the skin inserted into the concave part. The light source part may be disposed on a side of at least one of the light collector and the concave part.
    Type: Application
    Filed: February 21, 2019
    Publication date: August 22, 2019
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Woochang LEE, Ho Jun CHANG
  • Publication number: 20190181848
    Abstract: A delay locked loop circuit includes a duty detector configured to detect a duty cycle of a clock signal, and to determine whether to perform a coarse duty cycle correction based on the detected duty, and a delay locked loop core. The delay locked loop core is configured to selectively perform the coarse duty cycle correction for the clock signal according to the determination of the duty detector, perform a coarse lock for the clock signal during a first time period different from a second time period in which the coarse duty cycle correction is performed, and perform a fine duty cycle correction and a fine lock for the clock signal.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 13, 2019
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Sang-Kyeom KIM, Won-Joo Yun, SukYong Kang, Ho-Jun Chang