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나로우주센터 상공의 대기 안정도지수 및 뇌운관련 대류활동 특성 연구
김홍일,최은호,서성규,Kim, Hong-Il,Choi, Eun-Ho,Seo, Seong-Gyu 한국환경과학회 2019 한국환경과학회지 Vol.28 No.12
Successful launch requires state-of-the-art launch vehicle technology and constant test operations, However, the meteorological threat to the launch vehicle flight trajectory is also an important factor for launch success. Atmospheric stability above the Naro Space Center at the this time is very important, especially because the initial flight operation can determine the success of the launch. Moreover, during the flight of launch vehicle with rapid pressure and thrust into the atmosphere, convection activity in the atmosphere may create environmental conditions that cause severe weather threats such as thunderstorms. Hence, studies of atmospheric instability characteristics over the Naro Space Center are a necessary part of successful launch missions. Therefore, the main aims of this study were to (1) verify the atmospheric stability index and convection activity characteristics over the Naro Space Center using radiosonde data observed from 2007 to 2018 by the Naro Space Center, (2) analyze changes in the atmospheric stability index according to monthly and seasonal changes, and (3) assess how the calculated atmospheric stability index is related to actual thunderstorm occurrence using statistical analysis. Additionally, we aimed to investigate the atmospheric characteristics above the Naro Space Center through the distribution chart of the atmospheric stability index during summer, when convection activity is highest. Finally, we assessed the relationship between lightning occurrence and unstable atmospheric conditions, through predictability analysis performed using the lightning observation data of the Korea Meteorological Administration.
전기화학캐패시터용 MWNT 및 MWNT/DAAQ 나노 복합체의 제조 및 전기화학적 거동
김홍일,박수길,Kim, Hong-Il,Park, Soo-Gil 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
화학적 중합방법을 이용하여 HWNT/DAAQ를 합성하여 전기화학적 캐패시터용 전극 소재로서 전기화학적 특성을 연구하였다. XRD pattern 결과에서 MWNT/DAAQ의 표면에 DAAQ가 oligomer 상태로 존재하는 것을 확인 하였으며, SEM image를 통해 표면을 관찰하였고, TCA를 통해 열적안정성을 확인하였다. 활성탄과 MWNT/DAAQ에 기초한 전극의 용량은 1M의 $H_2SO_4$ 전해질 상에서 97F/g의 비방전용량을 확인되었으며, 또한 HWNT/DAAQ 복합 전극은 우수한 전기화학적 거동을 보이는 것을 관찰하였다. MWNT/DAAQ(1,5-diaminoanthraquinone) composites were prepared by chemical polymerization of DAAQ onto MWNT and their capacitance was evaluated by means of cyclic voltammetry in 1M $H_2SO_4$ electrolyte. The performances of such cells have been compared with pure MWNT and DAAQ based electrodes. The SEM image shows that DAAQ was coated onto MWNT during polymerization and thermal stability from th TG analysis. The highest specific capacitance values of 97F/g were observed with AC-MWNT/DAAQ composite electrode. And MWNT/DAAQ based composite electrode also showed relatively good electrochemical behaviors better than MWNT electrode in sulfuric acid electrolyte.
외접근 비교정술 후 발생한 단순 포진 바이러스 감염 치험례
김홍일,황소민,안성민,임광열,정용휘,송제니퍼김,정재용,Kim, Hong Il,Hwang, So Min,Ahn, Sung-Min,Lim, Kwang Ryeol,Jung, Yong Hui,Song, Jennifer K.,Jeong, Jae Yong 대한두개안면성형외과학회 2012 Archives of Craniofacial Surgery Vol.13 No.1
Purpose: Eczema herpeticum, caused by herpes simplex virus, is an infectious disease involving skin and internal organs. Varieties of physiologic, psychosocial, or environmental stress reactivate reservoir virus which exists in the trigeminal nerve ganglia. Authors report rare cases of nasal eczema herpeticum following corrective rhinoplasty. Methods: First case, 22-year-old female underwent corrective rhioplasty through an external approach in a local clinic. She developed progressive and painful erythema, nodules and vesicles on nose on the 9th day postoperatively. This unfamiliar lesion lead to a misdiagnosis as a bacterial infection, and had accelerated its progress to the trigeminal innervation of the nasal unit. Second case, a 23-year-old female underwent corrective rhinoplasty by external lateral osteotomy. Ten days after the surgery, disruption occurred on the external osteotomy site, and the ulceration gradually worsened. The surgeon misdiagnosed it as secondary bacterial infection and only an antibacterial agent was applied. Results: Both cases were healed effectively without any complication with proper wound dressing and antiviral therapy, and show no sequelae during an 8-month follow-up period. Conclusion: Eczema herpeticum is rare in the field of plastic surgery, but it should be kept in mind that secondary bacterial infections may lead to serious complications such as full-thickness skin loss. Thus, acknowledgement of the patient's past history regarding perioral or intraoral lesion may provide the surgeon with the possible expectancy of eczema herpeticum. Thus, if anyone develops eczema herpeticum, following facial plastic surgery, early diagnosis and immediate proper antiviral therapy will allow fast recovery without serious complications.
Experimentally induced fat embolism syndrome: shift from obstruction to toxic effects
김홍일,In Seok Kyung,이형석,Kim Hyo Young,김윤수 대한미용성형외과학회 2021 Archives of Aesthetic Plastic Surgery Vol.27 No.2
Background Two hypothetical mechanisms have been proposed for fat embolism syndrome: mechanical obstruction and biochemical reactions. However, it has not been proven whether these mechanisms are correlated. This study aimed to demonstrate the relationship between these two hypothetical mechanisms by observing biochemical and histological changes in animals. Methods After a preliminary study, 700 mg/kg of triolein was injected via the ear vein into 25 rabbits and hemodynamic changes in triglycerides, lipases, free fatty acids, and albumin over time were observed. Necropsies were immediately conducted on all experimental animals, and the lungs were examined histologically. Results Eight rabbits died within 1 hour after the injection due to mechanical obstruction. Six rabbits died 7–60 hours after the injection due to diffuse hemorrhage of the lung induced by the toxic biochemical reactions of free fatty acids. Histological examinations of the lungs of the surviving rabbits showed petechiae on the surfaces and evidence of recovery from hemorrhage. Blood levels of free fatty acids increased immediately after the injection of triolein. Conclusions This study revealed that fat emboli primarily injure the lung via mechanical obstruction. The fat is hydrolyzed into fatty acids and causes secondary damage via biochemical reactions. The present study sheds light on the pathophysiology of fat embolism syndrome, with possible implications for its management and prevention.
J. E. Kim(김주언),Y. H. Kim(김용현),B. S. Kim(김병수),H. I. Kim(김홍일),S. H. Park(박수호),S. J. Lee(이석준),David Paredes,N. Kim(김남훈) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Additive manufacturing (AM) enables the fabrication of complex designs which are typically unobtainable from conventional manufacturing methods. Thanks to the advantage of design flexibility, AM has recently gained attentions from diverse industries with its developments. In energy generation fields, large-size wind turbine blades require complex features to improve efficiency which can highly benefit from utilization of AM technology. In this research, a design for additive manufacturing (DFAM) of fabricating wind turbine blade is investigated, which is conventionally produced by assembling panels with shear webs. Through DFAM process considering design requirements, a generative design is adopted in the inner portion of the wind turbine blade, which replace shear webs, and the assembling process between panels and webs is removed. Finite element analysis is conducted to examine the natural frequency and mechanical performance of the resulting blade. By designing suitable structure, the natural frequency of the wind turbine blade is optimized efficiently to the using environment, and the desirable mechanical performance is obtained with lower weight.