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한국인 결절홍반, 경화홍반 환자들의 IGRA 양성률 조사
김강수 ( Kang Su Kim ),김상석 ( Sang Seok Kim ),김철우 ( Chul Woo Kim ) 대한피부과학회 2020 대한피부과학회지 Vol.58 No.1
Background: Erythema nodosum (EN) and erythema induratum (EI) are similar inflammatory diseases of the lower extremities. Several factors (infections, drug hypersensitivity, inflammatory diseases, etc.) have been suggested as the cause of these diseases. Among them is Mycobacterium tuberculosis (MTB) infection. However, there is still a lack of evidence supporting this finding. Objective: This study aimed to confirm whether Korean patients with EN/EI will exhibit positive interferon-gamma release assay (IGRA) results and determine the association of these disease with tuberculosis. Methods: We retrospectively analyzed the clinical characteristics and IGRA test results of 62 patients (46 with EN and 16 with EI). Results: A total of 22 of 44 EN patients (50%) had positive IGRA test results, except for two with “undetermined” results, and 12 of 16 EI patients (75%) had positive test results. This result was higher than that of the control group (15.5%, 292/1887) and showed a statistically significant difference (each p=0.000). Moreover, the proportion of EI patients with positive test results was higher than that of patients with severe psoriasis (35.6%, 112/315; p=0.001). Among EN/EI patients with positive IGRA test results, those treated with antituberculosis therapy (HREZ) showed good response rate. The response rate was 85.7% (6/7) for patients with EN and 90% (9/10) for those with EI. Conclusion: High IGRA positivity was found in Korean EN/EI patients. This finding suggests a significant association between these diseases and tuberculosis. (Korean J Dermatol 2020;58(1):14∼19)
김강수(Kang Soo Kim),김영석(Young Suk Kim),정용무(Yong Moo Cheong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Delayed Hydride Cracking (DHC) tests are conducted by using CT specimens of Zr-2.5Nb at 250 ℃. The test data is inputed for the FEM model. Two models is made according to the application of the hydride expansion. Hydride stresses and average stresses of the plastic zone of two FEM models are calculated and two results are compared. That results say that hydride fracture is due to the hydride expansion and say that hydride fracture is related to the relation between the increment of the hydride expansion stress and the increment of the average stress of the plastic zone on the hydride. Also, that results say that the hydride expansion is most important factor of DHC. Now, Stage Ⅰ and Stage Ⅱ of the unique DHC phenomenon can be explained through an analysis of the increment of the hydride expansion and the plastic constraint force in the plastic zone.
소용량 건물용 연료전지시스템 블로워의 가혹조건 평가에 관한 연구
김강수(Kangsoo Kim),이덕권(Deokkwon Lee),이정운(Jungwoon Lee),김은정(Eunjung Kim),김인찬(Inchan Kim),김영규(Younggyu Kim),신헌용(Hunyong Shin) 한국가스학회 2012 한국가스학회지 Vol.16 No.6
연료전지는 우수한 도시가스 인프라로 안정적인 에너지공급이 가능하고, 연료 다변화가 가능한 신에너지 기술이다. 연료전지 상용화를 위해 시스템의 성능 및 신뢰성뿐만 아니라, 가격의 저감이 필수적이다. 소용량 건물용 연료전지시스템에서 가격비중이 매우 높은 보조기기의 가격저감 연구의 일환으로, 국내 제작된 블로워의 안전 성능을 평가하고 개선방향을 모색하고자 하였다. 본 연구에서는 실제 연료전지시스템의 작동환경과 가장 유사한 환경에서 블로워의 성능 및 가혹조건 평가를 수행하였다. 블로워를 70℃ 온도조건에서 장기 가동 시 유량성능, 기밀성능 및 열적거동의 상관관계를 파악하여, 블로워의 성능 저하에 영향을 미치는 모터열화, 다이어프램 재질 및 토출구 구조 등의 주요인자를 도출하였다. The fuel cell is one of the renewable energy sources. And it is a new source of energy that can be applied to various fuels and continuously supported by the excellent city-gas infrastructure. It is important to improve performances and reliabilities, and reduce the cost of fuel cell systems for commercialization. And, some safety performances of blower domestically produced are evaluated and some improvements are researched to save the cost of fuel cell systems. In this paper, the performance and worst stress condition of blowers are evaluated in operating environment similar to the fuel cell systems. Actually, the correlation of flow, leakage and thermal behavior are evaluated in the worst stress condition at 70℃ and, some major factors of blower degradation such as a motor deterioration, material and structures of the outlet are examined.
이종재료 Butt 용접에 대한 Overlay 용접의 잔류응력해석
김강수(Kang Soo Kim),이호진(Ho Jin Lee),이봉상(Bong Sang Lee),정인철(In Chul Jung),변진귀(Jin Gwi Byeon),박광수(Kwang Soo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In recent years, the dissimilar metal, Alloy 82/182 welds used to connect stainless steel piping and low alloy steel or carbon steel components in nuclear reactor piping system have experienced cracking due to primary water stress corrosion(PWSCC). It is well known that one reason of the cracking is the residual stress by the weld. But, it is difficult to estimate exactly weld residual stress due to many parameters of welding. In this paper, the analysis of 3 FEM models made by ABAQUS Code is performed to estimate exactly the weld residual stress on the dissimilar metal weld. 3 FEM models are Butt model, Repair model and Overlay model and are the plane?strain 2D model. The thermal analysis and the stress analysis are performed on each model and the residual stresses on each model were calculated and compared respectively. Also, the specimen of Butt model was made and the residual stresses were measured by X-Ray method and Hole Drilling Technique. These results were compared with the FEM result of Butt model.
Zr-2.5Nb 압력관 크랙선단에서 수소화물의 응력해석
김강수(Kang Soo Kim),김영석(Young Suk Kim),정용무(Yong Moo Cheong),안상복(Sang Bok Ahn),임경수(Kyoung Soo Im) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
Delayed Hydride Cracking (DHC) tests are conducted by using CT specimens of Zr-2.5Nb at 250℃. The test data is inputed for the FEM model. The stresses of the hydride and Zr-2.5Nb elements near the crack tip of the FEM model are examined. Also, the plastic zone size and average stresses near the crack tip are calculated for checking the effects of the plastic constraint. The material behavior of the elements near a crack tip, the hydride expansion stress, the hydride fracture strength and the size of the plastic zone according to each K are found. Also, Stage Ⅰ and Stage Ⅱ of the unique DHC phenomenon can be explained through an analysis of the plastic constraint force in the plastic zone.