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여과집진기의 탈진 성능 향상을 위한 충격 기류 분사 시스템 최적화 설계에 관한 연구
홍성길(Hong, Sung-Gil),정유진(Jung, Yu-Jin),박기우(Park, Ki-Woo),정문헌(Jung, Moon-Hun),임기혁(Lim, Ki-Hyuk),서혜민(Suh, Hye-Min),손병현(Shon Byung-Hyun) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.8
본 연구에서는 전산유체역학(CFD)을 이용하여 산업체에 널리 적용되고 있는 충격기류형 탈진시스템의 탈진 특성을 규명하고, 그 성능을 향상시키기 위해 탈진부 유니트(unit) 형상을 개조한 경우의 탈진 성능을 비교하였다. 탈 진부 각 형상별로 탈진 공기량과 기류 분포, 유입속도 분포 등을 검토한 결과, 블로우 튜브에 노즐을 설치한 경우 (Case 3)와 벤츄리에 이중 유입관을 설치한 경우(Case4, 5)가 현재 현장에서 널리 적용되고 있는 구조(Case 1)에 비 해 탈진 공기량의 증폭 효과 및 기류 폭의 확장 현상이 우수한 것으로 예측되었다. 선정된 Case-5를 상용 백필터의 사양(직경 150 mm)에 적용하기 위해 벤츄리 제원을 결정한 결과, 내측 유입관의 직경 50 mm, 외측 유입관의 직경 90 mm의 제원을 적용하면 탈진 공기량을 최대로 유지할 수 있을 것으로 판단된다. The dedusting characteristics of pulse air jet type dedusting system which is widely applied in the industries were identified by utilizing the computational fluid dynamics (CFD) and the dedusting performance in modified shape of dedusting unit was compared in this study. The review on the dedusting air volume, air stream distribution and inflow velocity distribution on each shape of dedusting part showed that the case of installing the nozzle on the blow tube (Case-3) and the case of installing the double intaking tube to the venturi (Case-4 and Case-5) were more excellent than the structure (Case-1) which is widely applied in the field in its amplification effect on the air volume and extension of stream width. The specification of venturi was decided to apply the selected Case-5 for the option of the commercial back filter. It is considered that the dedusting air volume will be maintained in maximum in the case of 50 mm and 90 mm for the diameter of internal and external intaking pipe respectively.
용탕단조에 의한 Al2O3-SiO2 단섬유 및 SiC whisker 강화 알루미늄 합금기 복합재료의 제조
홍성길,윤중렬,최정철 ( Sung Kil Hong,Jung Yul Yun,Jung Chul Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.1
N/A SiC whisker and Al₂O₃-SiO₂short fiber reinforced AC8A, AC8B and AC8B(J) matrix composites were fabricated by squeeze casting method. Preform deformation, change of reinforcement volume-fraction and formation of macro-segregation in two composites were investigated by using micro Vickers hardness test, analysis of macro and micro structures with OM, SEM and EDAX. Al₂O₃,-SiO₂short fiber preform manufactured with 5% SiO₂binder in this study was considerably deformed and cracked, nevertheless, the short fibers were distributed homogeneously in the composites. In SiC whisker reinforced composites, on the other hand, preform deforming and cracking were not occurred, however, macro segregation zone formed along the infiltration routes by interface reaction during infiltration of molten metal into the preform was observed at center-low area in the composites. The decrease of hardness in the macro segregation zone resulted from the depletion of Si and Mg atoms.
허혈/재관류 환경하에서 청폐사간탕의 염증 관련 반응 억제 효과
홍성길,강봉주,조동욱 한국한의학연구원 2000 한국한의학연구원논문집 Vol.6 No.1
Chungpesagan-Tang (CST), a Korean traditional prescription composed of oriental medical herbs, has been used successfully to improve human health and regimen. This study was designed to examine the inhibitory effects of CST against in vitro ischemia/reperfusion-induced inflammatory response. We have characterized the production of prostaglandin E₂and arachidonic acid during ischemia/reperfusion in the human neuroblastoma SK-N-MC and human monocytic macrophage U937 cells and the inhibitory effect of CST on these inflammation-related substance formation has been found out in this study. This result suggested that CST used in this experiment reinforced formation has been found out in this study. This result suggested that CST used in this experiment reinforced antiinflammatory potentials and protected cells against ischemia/reperfusion-induced inflammatory response.
홍성길,황금연,강창석,약도건사 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.8
This articles is concerned with the mean-field micromechanics model that has been developed by several investigators as a powerful modification of Eshelby's theory for the study of the macromechanical behavior of composite materials. The energy approach that has been proposed is generalized and its applications to specific problem are presented and discussed. First, a general framework of the model is reformulated with emphasis on clarification of the key approximation involved. The model is then applied to the prediction of overall elastic properties of Al-SiC composites. For the system with randomly oriented spheroidal particles in particular, the overall Young's, bulk and shear moduli, computed as functions of the particle aspect ratio. The remainder of this article is devoted to the analysis of elastic-plastic responses of composite materials.