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박영민(Y.M. Park),최인호(I.H. Choi),장병희(B.H. Chang) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.4
The present paper describes the results of performance analysis for UH-60A rotor blade in hover. For the numerical simulations, commercial CFD software, FLUENT was used with Spalart-Allmaras turbulence model. The flow solver was based on node based scheme and second order spatial accuracy options was used for simulations. For the enhancement of wake capturing capability, high resolution grid was used around tip vortex region. Granting that somewhat over-prediction of thrust was observed near blade tip region, performance was well correlated with experimental data within 3% accuracy in the operating region. Finally it was shown that the present flow solver can be used as a preliminary performance analysis tool for hovering helicopter rotor blades.
濾胞性囊腫과 上顎洞炎을 야기한 上顎洞內 萌出된 智齒一例
Nam I W(南日祐),Choi I H(崔仁鎬),Baek S J(白承鎭) 대한구강악안면외과학회 1982 대한구강악안면외과학회지 Vol.8 No.1
The authors have treated a 24 years old patient with a maxillary wisdom tooth erupted in the maxillary smus by which a follicular cyst and maxillary sinusitis occurred. 1. Enucleation of cyst wall and radical operation of the maxillary sinusitis were performed by application of Caldwell-Luc s operation. 2. The follicular cyst was supposed to be caused from the dental follicle of the maxillary left third molar erupted in the maxillary sinus. 3. We didn t maKe any decision that the cause of the maxillary sinusitis could have an interaction between the third molar and the maxillary sinusitis, for which perhaps common cold could influence an inflammation in the antrum. 4. In microscopic findings in the cyst wall enucleated, a lots of inflammatory cell infiltrations and destruction of epithelial lining in the cyst wall were observed.