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3 MW급 풍력 발전 타워 플랜지 형상비가구조적 안정성에 미치는 영향
김현오,이연호,허현도,김윤제 한국유체기계학회 2018 한국유체기계학회 논문집 Vol.21 No.2
As the interest of the development of new renewable energy has picked up, demand for energy production of wind power generation is increasing. In order to increase the power generation of the wind turbine, the size of the wind tower is required to be enlarged as the size of the blades gets larger. However, the enlargement of the wind turbine sometimes causes breakdown due to the increase of its own weight and wind load. Therefore, it is necessary to develop techniques to design and manufacture components that can achieve structural stability of wind turbines. In this study, numerical analysis of stress applied to wind tower and tower flange was performed to secure the optimal design data base. The optimal design study of the shape and parametric investigation of the tower with varying wind speeds was carried out by using the fluid-structure interaction (FSI) analysis. Numerical analysis of the von Mises stress of the tower and flange was calculated using the commercial code ANSYS 17.1. The results were described graphically and the tower flange case with the highest structural stability was deducted.
김현오,염숙경,한승범,권효진,강진한,Kim, Hyun O,Yum, Sook Kyung,Han, Seung Beom,Kwon, Hyo Jin,Kang, Jin Han The Korean Society of Pediatric Infectious Disease 2012 Pediatric Infection and Vaccine Vol.19 No.3
Streptococcus anginosus는 Streptococcus milleri group에 속하는 viridians streptococci의 한 종으로, 사람의 구강, 상부 호흡기, 위장관 및 여성 생식기에 정상 세균총으로 존재하며, 숙주의 면역 상태에 따라 질환을 일으킬 수 있다. 저자들은 치과 치료 후 발열, 황달, 우상복부 불편감을 주소로 내원한 건강하였던 15세 남아에서 S. anginosus에 의한 균혈증이 동반된 급성 무결석 쓸개염을 진단하였고, 환아는 항균제 치료 후 호전되었다. 소아 청소년 시기에 흔하지 않은 급성 무결석 쓸개염이 기저 질환 없는 청소년에서 viridians streptococci에 의해 발생한 드문 경우이다. Streptococcus anginosus is a member of Streptococcus milleri group, and is found in the oral mucosa, respiratory tract, and gastrointestinal tract as normal flora. It can develop into a disease in patients with deteriorating clinical condition or with clinical risk factors. A previously healthy 15-year-old boy was admitted due to fever, abdominal discomfort and vomiting which lasted for 7 days. He had a history of dental procedure 1 day before the development of fever. He was diagnosed with acute acalculous cholecystitis based on the clinical, laboratory, and imaging finding, and S. anginosus was isolated from the blood culture. The patient was successfully treated with antibiotic therapy.
김현오,오현진,이재욱,장필상,정낙균,조빈,김학기 대한소아청소년과학회 2013 Clinical and Experimental Pediatrics (CEP) Vol.56 No.1
Purpose: Lymphocyte subset recovery is an important factor that determines the success of hematopoietic stem cell transplantation (HSCT). Temporal differences in the recovery of lymphocyte subsets and the factors influencing this recovery are important variables that affect a patient’s posttransplant immune reconstitution, and therefore require investigation. Methods: The time taken to achieve lymphocyte subset recovery and the factors influencing this recovery were investigated in 59 children who had undergone HSCT at the Department of Pediatrics,The Catholic University of Korea Seoul St. Mary’s Hospital, and who had an uneventful follow-up period of at least 1 year. Analyses were carried out at 3 and 12 months post-transplant. An additional study was performed 1 month post-transplant to evaluate natural killer (NK) cell recovery. The impact of preand post-transplant variables, including diagnosis of Epstein-Barr virus (EBV) DNAemia posttransplant,on lymphocyte recovery was evaluated. Results: The lymphocyte subsets recovered in the following order: NK cells, cytotoxic T cells, B cells,and helper T cells. At 1 month post-transplant, acute graft-versus-host disease was found to contribute significantly to the delay of CD16+/56+ cell recovery. Younger patients showed delayed recovery of both CD3+/CD8+ and CD19+ cells. EBV DNAemia had a deleterious impact on the recovery of both CD3+ and CD3+/CD4+ lymphocytes at 1 year post-transplant. Conclusion: In our pediatric allogeneic HSCT cohort, helper T cells were the last subset to recover. Younger age and EBV DNAemia had a negative impact on the post-transplant recovery of T cells and B cells.