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2차원 쐐기 형상의 자연 및 분사 공동의 비정상 유동 해석 연구
김진하(J.H. Kim),최요한(Y.H. Choi),김종암(C.A. Kim),정소원(S.W. Jeong),안병권(B.K. Ahn) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.2
In this paper, the natural and ventilated cavitating flows behind a two-dimensional wedge is numerically investigated. In order to simulate the cavitation, we use multi-phase RANS flow solver with a homogeneous mixture model and a preconditioning technique. Good agreements are obtained between the present numerical results and the experiment for cavitating flow patterns, cavity length, and cavity pressure. Both cavitating flows show the characteristic of unsteady periodic vortical flow above certain cavitation number. The change of drag coefficients of a wedge by cavitation is also analyzed. Drag coefficients along with cavitation numbers change more by ventilated cavitation than natural cavitation. Compared to drag coefficients with no cavitation, drag coefficients are decreased by natural and ventilated cavitation. Ventilated cavitation can significantly decrease drag coefficients by changing pressure behind a wedge.
이기록(K . R . Lee),이재성(J . S . Lee),김만조(M . J . Kim),김진하(J . H . Kim),이명선(M . S . Lee),송인철(I . C . Song) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11
N/A Objectives : This retrospective study was undertaken to evaluate for the clinical characterristics and to gain greater insight into the diagnosis and management of ectopic pregnancy. Material and Methods : This study was done 112 women with ectopic pregnancy who were admitted, operated, and confirmed by histopathological at the Department of Obstetrics and Gynecology, Pusan medical center from Jan. 1, 1995 to Dec. 31, 1999. Results : 1. The incidence of ectopic pregnancy was 2.9% (1 in 34.1pregnancy). 2. Age distribution of cases was showed the highest frequency between 25-29 years group. 3. According to past history of illness artificial abortion was 66%, laparoscopic tubal ligation was 14.3%, PID was 13.4%, previous c/s was 13.4%, appendectomy was 13.4%, previous ectopic pregnancy was 9.8%, pelvic Tuberculosis was 2.7%, tuboplasty was 2.7%, and IUD was 2.7%. 4. As to chief complaints of cases on admission, lower abdominal pain was 90.2%, vaginal spotting or bleeding was 45.5%. 5. Positive finding of culdocentesis was 80.3%, and that of urine hCG was 93.4%. 6. According ultrasonographic finding, adnexal mass was visible 50.7% among 73 cases. 7. On pelvic examination, pelvic tenderness was 90.2%, cervical motion tenderness was 77.2% among 92 cases. 8. Ectopic pregnancy was implanted on the fallopian tube 97.3%, cervix 1.8%, and ovary was 0.9% retrospectively. 9. Of total 112 cases, ipsilateral salpingectomy was 75.9%, ipsilateral salpingooophrectomy was 10.7%, total abdominal hysterectomy was 0.9%. Conclusions : Ectopic pregnancy is one of the leading causes of maternal mortality in the early pregnancy, subsequently may lead to infertility in reproductive age women. In order to minimize such problems, clinicians are particularly familiar with early diagnosis and appropriate diagnotic procedures on ectopic pregnancy.