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압축성 기저 유동에 대한 GEKO 모델 계수의 불확실성 정량화 연구
정영기(Y.K. Jung),장경식(K. Chang),배재현(J.H. Bae) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.1
The present work, supersonic flow over an axisymmetric base is simulated using Generalized k-ω (GEKO) model which is proposed by Menter. GEKO two-equation model based on the k-ω formulation provides free model coefficients which can be adjusted by user depending on the specified flow type. Uncertainty Quantification analysis (UQ) is adopted to quantify the uncertainty of the model coefficients and to calibrate the coefficients for the flow. Latin Hypercube Sampling (LHS) method is used for sampling input parameters which are independent as a uniform distribution. Surrogate model is constructed by using ordinary least-squares (OLS). In order to characterize the posterior via Markov Chain Monte Carlo sampling, Affine Invariant Ensemble Algorithm (AIES) is selected. Through Forward problem, the most effective coefficient among the coefficients of GEKO model is figured out (Sensitivity analysis). Calibrated model coefficients are obtained through Bayesian inference. The results obtained using the calibrated coefficients by UQ to the base flow shows better agreement with available experimental measurements than the results obtained using default model coefficients.
최춘한(C H Choi),박영명(J K Lee),이정규(Y M Park),정영기(Y K Jung),최재철(J C Choi),서동룡(D R Shu),김원(W. Kim) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.4
Ectopic or heterotopic pancreas is a developmental anomaly, Since the first gross description of heterotopic pancreas in the gastrointestinal tract by Schultz in 1727 and the first histologic descrip- tion of this phenomenon by Klob in 1859, intermittent resports have appeared in the literature adequately reviewing the clinical, radiologic, endoscopic and surgical aspects of this lesion. Reported here is a case of heterotopic pancreas of the stomach by gastrofiberscopic examination. A 65-year-old woman visited in April, 1989 to this hospital for evaluation and treatment of postprandial substernal pain and epigastric discomfortness for 10 days. Gastrofiberscopy revealed a 6 >< 7 cm sized protruding mass along the posterior wall on mid-body of stomach. It's center appeared an umbilical shaped dimple with a relatively normal mucosa. Biopsy showed a nest of pancreatic acini. Symptoms relieved after soft diet and now we follow up the patient at O.P.D.
임경수(K . S . Lim),김진우(J . W . Kim),최영미(Y . M . Choi),정인석(I . S . Jung),정영기(Y . K . Jung),서동룡(D . R . Seo),박두복(D . B . Park) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.4
Multiple cnacers frequently develop in the colon and rectum. It is often difficult to detect all these multiple lesions preoperatively: a correct diagnosis is frequently obtained only upon examination of the resected specimen. Triple synchronous primary golon cancer is an exceedingly rare disease. Despite of its rarity, multiple colon cancers should be investigated in the patients in whom clinical or laboratory evidence of colon cancer is suspected. We experienced one case of triple synchronous primary colon cancer recently and report here with the review of the literature.