Search

Your search keyword '"Kim, Jeehyun"' showing total 755 results
Start Over Author "Kim, Jeehyun"
755 results on '"Kim, Jeehyun"'

212. Non-Destructive Identification of Weld-Boundary and Porosity Formation During Laser Transmission Welding by Using Optical Coherence Tomography

Author

Kim, Kanghae, primary, Kim, Pilun, additional, Lee, Jaeyul, additional, Kim, Suwon, additional, Park, Sungjo, additional, Choi, Soo Ho, additional, Hwang, Junho, additional, Lee, Jong Hoon, additional, Lee, Ho, additional, Wijesinghe, Ruchire Eranga, additional, Jeon, Mansik, additional, and Kim, Jeehyun, additional

Published
2018
Full Text
View/download PDF

225. Application of wearable optical coherence tomography (OCT) and loop-mediated isothermal amplification (LAMP) techniques for in situ real-time field inspection of apple Marssonina blotch disease

Author

Wijesinghe, Ruchire Eranga, additional, Lee, Seung-Yeol, additional, Ravichandran, Naresh Kumar, additional, Shirazi, Muhammad Faizan, additional, Han, Sangyeop, additional, Jeong, Hyosang, additional, Kim, Pilun, additional, Jung, Hee-Young, additional, Jeon, Mansik, additional, and Kim, Jeehyun, additional

Published
2017
Full Text
View/download PDF

227. Optical coherence tomography-integrated, wearable (backpack-type), compact diagnostic imaging modality for in situ leaf quality assessment: publisher’s note

Author

Wijesinghe, Ruchire Eranga, primary, Lee, Seung-Yeol, additional, Ravichandran, Naresh Kumar, additional, Han, Sangyeop, additional, Jeong, Hyosang, additional, Han, Youngmin, additional, Jung, Hee-Young, additional, Kim, Pilun, additional, Jeon, Mansik, additional, and Kim, Jeehyun, additional

Published
2017
Full Text
View/download PDF

236. Imaging nanoparticle flow using magneto-motive optical Doppler tomography.

Author

Kim, Jeehyun, Kim, Jeehyun, Oh, Junghwan, Milner, Thomas E, Nelson, J Stuart, Kim, Jeehyun, Kim, Jeehyun, Oh, Junghwan, Milner, Thomas E, and Nelson, J Stuart

Abstract

We introduce a novel approach for imaging solutions of superparamagnetic iron oxide (SPIO) nanoparticles using magneto-motive optical Doppler tomography (MM-ODT). MM-ODT combines an externally applied temporally oscillating high-strength magnetic field with ODT to detect nanoparticles flowing through a microfluidic channel. A solenoid with a cone-shaped ferrite core extensively increased the magnetic field strength (B(max) = 1 T, [Formula: see text]) at the tip of the core and also focused the magnetic field in microfluidic channels containing nanoparticle solutions. Nanoparticle contrast was demonstrated in a microfluidic channel filled with an SPIO solution by imaging the Doppler frequency shift which was observed independently of the nanoparticle flow rate and direction. Results suggest that MM-ODT may be applied to image Doppler shift of SPIO nanoparticles in microfluidic flows with high contrast.

Published
2007

237. Hemoglobin contrast in magnetomotive optical Doppler tomography.

Author

Kim, Jeehyun, Kim, Jeehyun, Oh, Junghwan, Milner, Thomas E, Nelson, J Stuart, Kim, Jeehyun, Kim, Jeehyun, Oh, Junghwan, Milner, Thomas E, and Nelson, J Stuart

Abstract

We introduce a novel contrast mechanism for imaging blood flow by use of magnetomotive optical Doppler tomography (MM-ODT), which combines an externally applied temporally oscillating high-strength magnetic field with ODT to detect erythrocytes moving according to the field gradient. Hemoglobin contrast was demonstrated in a capillary tube filled with moving blood by imaging the Doppler frequency shift, which was observed independently of blood flow rate and direction. Results suggest that MM-ODT may be a promising technique with which to image blood flow.

Published
2006

238. Wavelength-Filter Based Spectral Calibrated Wave number - Linearization in 1.3 mm Spectral Domain Optical Coherence

Author

Wijeisnghe, Ruchire Eranga Henry, Cho, Nam Hyun, Park, Kibeom, Shin, Yongseung, and Kim, Jeehyun

Subjects
Astrophysics::Instrumentation and Methods for Astrophysics, Article
Abstract

In this study, we demonstrate the enhanced spectral calibration method for 1.3 μm spectral-domain optical coherence tomography (SD-OCT). The calibration method using wavelength-filter simplifies the SD-OCT system, and also the axial resolution and the entire speed of the OCT system can be dramatically improved as well. An externally connected wavelength-filter is utilized to obtain the information of the wavenumber and the pixel position. During the calibration process the wavelength-filter is placed after a broadband source by connecting through an optical circulator. The filtered spectrum with a narrow line width of 0.5 nm is detected by using a line-scan camera. The method does not require a filter or a software recalibration algorithm for imaging as it simply resamples the OCT signal from the detector array without employing rescaling or interpolation methods. One of the main drawbacks of SD-OCT is the broadened point spread functions (PSFs) with increasing imaging depth can be compensated by increasing the wavenumber-linearization order. The sensitivity of our system was measured at 99.8 dB at an imaging depth of 2.1 mm compared with the uncompensated case.

Published
2013

Catalog

Books, media, physical & digital resources
See catalog results