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In vitro fertilization using sex-sorted boar sperm mediated by magnetic nanoparticles
Hakjae Chung,Sunyoung Baek,Soojin Sa,Youngshin Kim,Joonki Hong,Eunseok Cho,Jihwan Lee,Seungmin Ha,Jungho Son,Seunghwan Lee,Inchul Choi,Kyungwoon Kim 충남대학교 농업과학연구소 2020 Korean Journal of Agricultural Science Vol.47 No.4
Guillain-Barré syndrome supervening on meningitis in primary Epstein-Barr virus infection
Lee, Jeong-Yoon,Sunwoo, Jun-Sang,Kwon, Kyum-Yil,Lee, Kyung Bok,Ahn, Moo-Young,Roh, Hakjae The Korean Society of Clinical Neurophysiology 2019 Annals of Clinical Neurophysiology Vol.21 No.1
Primary Epstein-Barr virus (EBV) infection can manifest with a broad spectrum of neurological complications. There are only rare reports of Guillain-$Barr{\acute{e}}$ syndrome (GBS) supervening on meningitis in patients with primary EBV infection. Clear evidence of central nervous system infection makes it difficult for the clinicians to consider a diagnosis of GBS. We present a patient with GBS supervening on meningitis in primary EBV infection.
Simulation Study of Plasma Display Panel-Based Flat Panel X-Ray Detector
Hakjae Lee,Kisung Lee,Sangheum Eom,Hanho Park,Jungwon Kang IEEE 2013 IEEE transactions on nuclear science Vol.60 No.2
<P>Screen-film-based radiography is being rapidly replaced by digital radiography (DR). Thin-film-transistors (TFT) with amorphous silicon (a-Si) or amorphous selenium (a-Se) are usually used in DR X-ray imaging systems. Another flat panel display, plasma display panel (PDP), has a structure that is similar to that of the conventional gas type radiation detectors, and can be manufactured with lower costs than the TFT-based detector panels. The motivation of this study was to develop a cost-effective DR detector using the PDP. In order to apply the PDP technologies in gaseous detectors for X-ray imaging, we modified the pixel's structure and optimized the materials inside the PDP panel. To maximize the signal's intensity, we re-designed the panel's structure based on the gas microstrip detector (GMD), and estimated the performance of the proposed detector using the Monte Carlo simulation method. Signal intensity of gaseous detector is determined by the amount of ionization as well as by the avalanche effect. The ionization and avalanche processes were simulated using the Geant4 and Garfield, respectively. Four types of gas mixtures and various values of electric fields have been explored. The results show that a higher proportion of Xe helps to generate more ionization electrons. The results also suggest that the electric field, which is applied between anode and cathode strips, is a dominant factor for the avalanche effect to occur. In this study, the GMD structure was adopted for the plasma-display-panel-based X-ray detector. A quantitative verification of the effectiveness of the proposed structure was performed as well.</P>
Hakjae Lee 국제문화기술진흥원 2022 International Journal of Advanced Culture Technolo Vol.10 No.4
This paper is about KTV special documentary “Baekdu to Halla, It’s Peace Now” which looks back on the journey of President Moon Jae-in to the 3rd inter-Korean summit following former Presidents Kim Dae-jung and Roh Moo-hyun, following the 2018 inter-Korean summit held under the slogan of 'Peace and a New Future'. The documentary was produced in the form of a road documentary that looked back at the meaningful results of the summit meeting with the MC through related places and various people, narrated by singer Kang San-Ae. Based on this case, the difference between the development of road documentaries and general informational documentaries about the existing production process is identified, and the differences between the production format, production characteristics, and development method of road documentaries are described. I would like to present an example of how it can be desirable to set the format of the road documentary according to the production environment of broadcasting companies and planning factors.
Development of a DAQ system for a plasma display panel-based X-ray detector (PXD)
Lee, Hakjae,Jung, Young-Jun,Eom, Sangheum,Kang, Jungwon,Lee, Kisung Elsevier 2015 Nuclear Instruments & Methods in Physics Research. Vol.784 No.-
<P><B>Abstract</B></P> <P>Recently, a novel plasma display panel (PDP)-based X-ray detector (PXD) was developed. The goal of this study is to develop a data acquisition system for use with the PXD as an imaging detector. Since the prototype detector does not have any barrier ribs or a switching device in a detector pixel, a novel pixelation scheme—the line-scan method—is developed for this new detector. To implement line scanning, a multichannel high-voltage switching circuit and a multichannel charge-acquisition circuit are developed. These two circuits are controlled by an FPGA-based digital signal processing board, from which the information about the charge and position of each pixel can be sent to a PC. FPGA-based baseline compensation and switching noise rejection algorithms are used to improve the signal-to-noise ratio (SNR). The characteristic curve of the entire PXD system is acquired, and the correlation coefficients between the X-ray dose, and the signal intensity and the SNR were determined to be approximately 0.99 and 52.9, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed a data acquisition circuit for a novel X-ray imaging detector. </LI> <LI> Line scan, noise rejection, and data transmission methods have been implemented by the FPGA. </LI> <LI> The linearity and SNR of the proposed detector system have been measured quantitatively. </LI> </UL> </P>
Lee, Hakjae,Chun, Jaehee,Lee, Kisung,Kim, Kyeong Min The Institute of Electronics and Information Engin 2015 IEIE Transactions on Smart Processing & Computing Vol.4 No.5
The aim of this study is to develop a 3D registration algorithm for positron emission tomography/computed tomography (PET/CT) and magnetic resonance (MR) images acquired from independent PET/CT and MR imaging systems. Combined PET/CT images provide anatomic and functional information, and MR images have high resolution for soft tissue. With the registration technique, the strengths of each modality image can be combined to achieve higher performance in diagnosis and radiotherapy planning. The proposed method consists of two stages: normalized mutual information (NMI)-based global matching and independent component analysis (ICA)-based refinement. In global matching, the field of view of the CT and MR images are adjusted to the same size in the preprocessing step. Then, the target image is geometrically transformed, and the similarities between the two images are measured with NMI. The optimization step updates the transformation parameters to efficiently find the best matched parameter set. In the refinement stage, ICA planes from the windowed image slices are extracted and the similarity between the images is measured to determine the transformation parameters of the control points. B-spline. based freeform deformation is performed for the geometric transformation. The results show good agreement between PET/CT and MR images.