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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
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.