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여름에 발생한 혈구탐식림프조직구증을 동반한 중증쯔쯔가무시병 1예
안재성 ( Jae-sung Ahn ),노진희 ( Jin-hee Noh ),김형래 ( Hyung-rae Kim ),정지원 ( Jiwon Jung ),조재철 ( Jae-cheol Jo ),임지훈 ( Ji-hun Lim ),전재범 ( Jae-bum Jun ) 대한내과학회 2017 대한내과학회지 Vol.92 No.3
In Korea, scrub typhus usually occurs in October and November. Hemophagocytic lymphohistiocytosis (HLH) is a distinct clinical entity characterized by a high fever, pancytopenia, hepatosplenomegaly, histiocyte proliferation, and hemophagocytosis. We encountered a summertime case of severe scrub typhus presenting as HLH. A 49-year-old female complained of abdominal pain and fever 3 days in duration. On hospital day 3 she was transferred to the intensive care unit because of clinical deterioration accompanied by severe sepsis. As an eschar was evident on the right shoulder, we commenced doxycycline. Her condition improved dramatically and she was discharged on day 14. Although the indirect immunofluorescence antibody test (IFA) for Orientia tsutsugamushi was negative on admission, a repeat IFA test was positive; the antibody titer was 1:5,120 on hospital day 10. Scrub typhus should be considered during differential diagnosis in a patient with severe sepsis in any season except the fall. (Korean J Med 2017;92:321-325)
스퍼터링법에 의한 ZnO 투명전도막의 제작과 전기적 특성
정운조,조재철,정용근,유용택 ( Woon Jo Jeong,Jae Cheol Cho,Yong Kun Jeong,Yong Tek Yoo ) 한국센서학회 1997 센서학회지 Vol.6 No.1
ZnO thin film had been deposited the glass by sputtering method, and investigated by optical and electrical properties. When the rf power was 180W and sputtering pressure was 1 x 10^(-3) Torr at room temperature, thin film deposited had strongly oriented c-axis and the lowest resistivity(1 x 10^(-4)Ω·cm), and then carrier concentration and Hall mobility were 6.27x10^(20) cm^(-3) and 22.04㎠/V·s, respectively. Transmittance of ZnO thin film in visible range was above 90%, and this thin film cut off the ultraviolet range below 330nm and the infrared and range above 850nm. And after annealing in hydrogen ate, the resistivity of ZnO thin film was somewhat decreased, while obtained as stable state.
치과 임플란트 스크루 풀림토크 개선용 DLC 박막 코팅에 관한 연구
정운조(Woon-Jo Jeong),조재철(Jae-Cheol Cho) 대한전기학회 2018 전기학회논문지 Vol.67 No.10
In this paper, we studied coatings of the DLC thin film for improving loosening torque of dental implant screw. We used a filtered arc ion plating process which can realize the most dense DLC layer by coating the DLC thin film on the surface of the dental abutment screw. It showed both hardness comparable to diamond and low friction coefficient similar to graphite, and to improve the loosening phenomenon by increasing the screw tightening force Cr/CrN, Ti/TiN or Ti/TiN/Cr/CrN buffer layers were deposited for 5 to 10 minutes to improve the adhesion of the DLC thin film to the surface of the Ti (Gr.5), and then the DLC thin film was coated for about 15 minutes. As a result, the Cr/CrN buffer layer exhibited the highest hardness of 29.7 GPa, the adhesion of 18.62N on average, and a very low coefficient of friction of less than 0.2 as a whole. And we measured loosening torque after one million times with masticatory movement simulator. As a result, the values of the coated screw loosening torque were clearly higher than those of the uncoated screw. From this, it was found that the DLC coating was effective methods improving the loosening torque. In addition, it was confirmed that the cytotoxicity test and cell adhesion test showed high biocompatibility.
광통신용 글라스렌즈 성형 금형의 이형성 코팅에 관한 연구
정운조(Woon-Jo Jeong),조재철(Jae-Cheol Cho) 대한전기학회 2017 전기학회논문지 Vol.66 No.6
The Diamond-Like-Carbon (DLC) coating is a new carbon-based amorphous material. Carbon ions in the plasma are electrically accelerated and collide with the substrate to form a thin film. This film has similar properties to diamonds such as high surface hardness, low coefficient of friction, corrosion resistance and durability that do not react with acids and bases. Also, since there is no thermal deformation, it can be printed at room temperature. and coated on almost all materials such as paper, polymer, ceramics and various metals even aspheric lens it is possible to mirror surface coating with excellent surface roughness. In this paper, we have analyzed the DLC film formed by Filtered Arc Ion Plating (Filtered AIP) process.
Li₂O의 삼출이 없는 LiNbO₃ 광도파로의 제조방법
김상혁(Kim Sang Hyuck),김상국(Kim Sang Kuk),조재철(Jo Jae Cheol),최상삼(Choi Sang Sam) 한국광학회 1991 한국광학회지 Vol.2 No.3
리튬나이오베이트 결정에 Ti를 열확산시켜 광도파로를 만드는 방법에서 문제가 되는 out-diffusion(삼출) 문제를 해결하는 방안으로 확산과정 이전에 SiO₂ 박막을 시료 위에 입히고 Ti을 열확산시켜 광도파로를 제조하는 방법을 제안하였으며, 기존의 방법에 의해서 만들어진 광도파로와 본 연구의 방법에 의해서 만든 광도파로의 근시야상(mear field pattern)을 비교하였다. We report a new method of fabricating a Ti:LiNbO₃ waveguide with no out-diffusion by coating the waveguide with SiO₂ thin film. It was coated before diffusion process, and the Li₂O out-diffusion was prevented in the diffusion process. We compare the near field patterns of the guided modes between the typical waveguide and the waveguide fabricated by new method proposed here.