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경남(慶南) 양산지역(梁山地域)에 분포(分布)하는 화산암류(火山岩類)의 지구화학적(地球化學的) 특성연구(特性硏究)
김문영,신홍자,이평구,장영남,Kim, M.Y.,Shin, H.J.,Lee, P.K.,Jang, Y.N. 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.2
The altered volcanic rocks, ranging from tuffaceous to andesitic rocks are widely distributed around the "caldera" area in the southeastern part of Kyeongsang province. The volcanic activity and tectonic movement are assumed to be followed by the hydrothermal activities in the area. From the mineral assemblage the type of alteration can be divided into two types; propylitic and argillic. The average concentration of gold in hydrothermally altered rocks is somewhat lower (about 20 ppb) than that of fresh rocks (45-25 ppb), but for Ag, vice versa. During the hydrothermal process, the concentration of the trace elements Ag, Hg, Co, As, Hf, Sc, Si, Al increased, and that of Na, Rb, K, Au, Mg, Ca etc. decreased. The high anomalous contents of silver for altered rocks range from 4-7 ppm and 1-3 ppm for relatively fresh rocks.
다운증후군의 산전진단을 위한 다양한 선별검사의 기여율 비교 - 산전 및 신생아때 진단된 96 례 분석 -
한정열(J . Y . Han),김문영(Y. M . Kim),조준형(J . H . Cho),안현경(H . K . Ahn),류현미(H . M . Ryu),김진미(J . M . Kim),김영미(Y . M . Kim),박소연(S . Y . Park),한혜경(H . K . Han),이영호(Y . H . Lee),양재혁(J . H . Yang) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.10
Objective : The purpose of this study was comparison of the contribution rate for prenatal diagnosis of Down syndrome using various screening methods (Age: greater than or equal to 35 years old, Serum markers: Triple test, Ultrasonography: abnormal sonographic findings, nuchal translucency, nuchal fold thickness).Methods : Total 96 cases of Down syndrome, prenatally or postnatally diagnosed between Jan. 1990 and Sept. 1999, made up the study population. We got the contribution rate of various prenatal screening methods of down syndrome, and obtained the efficiency of various screening program applied for last 10 years. Results : The frequencies of Down syndrome confirmed in prenatal and postnatal were 68 (71%) and 28 (29%) in respectively. The mean age of mother of Down syndrome fetus was 33.0±5.7 years old. The frequency rate of Down syndrome was 0.4, 1.3, 0.7, 0.7, 1.6, 0.7, 1.2, 2.2, 2.0 and 2.3 a 1,000 deliveries from 1990 to 1999 (Y= 0.28+0.18 year, P=0.01). The percentage of Down syndrome diagnosed prenatally was 0 (0/2), 43 (3/7), 50 (2/4), 25 (1/4), 56 (5/9), 100 (5/5), 71 (5/7), 78 (14/18), 78 (14/18) and 89 (17/19) from 1990 to 1999 (Y= 12.9+8.9 year, P=0.000). The contribution rate of prenatal diagnosis for Down syndrome was 30.2±5.6% by age, 18.2±3.4% by triple test and 51.7±6.3% by ultrasonography, and was significantly difference among each screen methods (P=0.008). Conclusions : This study shows that our prenatal screening program is highly effective to detect Down syndrome and especially ultrasonographic findings (abnormal sono findings, Nuchal translucency, Nuchal fold thickness) may be more important than that of age or Triple test to detect the Down syndrome prenatally.
염색체 이수성질환을 선별하기 위한 삼중 표지물질 검사의 성과에 관한 연구
최용관(Y. K. Choi),김문영(M. Y. Kim),한정열(J. Y. Han),류현미(H. M. Ryu),양재혁(J. H. Yang),김은성(E. S. Kim),이홍복(H. B. Lee),한인수(E .S. Kim),고명인(M. I. Ko),한호원(H. W. Han) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.9
Objective: To evaluate the effectiveness of a screening protocol using a combination of maternal age and three biochemical markers for the antenatal detection of fetal chromosomal aneuploidy Materials and methods: In our retrospective, 5,308 women who were screened for Down syndrome at second trimester of pregnancy and delivered between March 1994 and February 1996 at Samsung Cheil hospital were studied. Also, 1,378 women were simultaneously studied for screening for Edward syndrome between November 1995 and February 1996. According to maternal age and the concentration of measured maternal serum markers (α-fetoprotein, unconjugated E3, hCG), the risk ratio of Down syndrome and Edward syndrome were calculated by α-software V. 4.1. The screening positive women were performed amniocentesis for fetal karyotyping after genetic counseling. Results: The average age was 28 years old. The average of the geatational weeks was 16.3 weeks. The followings are equations of expected median for each maternal serum markers. AFP(ng/ml)=10(0.474+0.0652xGestational week) uE3(nmol/L)=10(-0.852+0.0932xGestational week) hCH(IU/ml)=217,523/[1+Exp(5.62+0.17xGestational week)] Among 5,308 cases, screen positive was in 248 cases(4.7%). But amniocentesis was performed in 126 cases(2.4%). Down syndrome was detected in 7 cases. The difference of the prevalance rate for Down syndrome between younger than 35 years old (1.2/1,000) and older than or equal to 35 years old(6.7/1,000) was statistically significant (P=0.035). However, in screen negative cases, Down syndrome was detected in 2cases. Overall, the detection rate, false positive for Down syndrome were 77.8%, 4.5% respectively and the ratio for OAPR was 1:35. In Edward syndrome, screen positive was in 4 cases(0.3%). Edward syndrome was confirmed in 2 cases by amniocentesis The detection rate, false positive for Edward syndrome were 100%, 0.1 % and the ratio for OAPR was 1:2. Conclusion: The prenatal screening test by the combination of maternal age and the concentration of maternal serum markers was effective to detect Down syndrom and Edward syndrome at second trimester of pregnancy.
쌍태임신시 태반유형 및 제대부착형태가 성장 불일치에 미치는 영향에 관한 연구
안현경(H . K . Ahn),양광문(K . M . Yang),홍성란(S . R . Hong),류현미(H . M . Rheu),김문영(M . Y . Kim),한정열(J . R . Han),최규홍(K . H . Choi),양재혁(J . H . Yang),김은성(E . S . Kim) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11
Object : The purpose of the study is to determine whether the type of placentation and abnormal cord insertion can affect discordant growth in twin gestation. Materials and methods : We investigated 422 sets of structually normal twin delivered at our twin clinic after 26 weeks of gestation from 1995-1997. All cases of placenta were examined for pathologic evaluation during the study periods. The type of placentation was divided into four groups: monochorionic monoamniotic placenta (n=4); monochorionic diamniotic placenta (n=62); dichorionic diamniotic fused placenta (n=163); dichorionic diamniotic separate placenta(n=193). Cord insertion was also divided into three groups: both side abnormal insertion (n=17); either side abnormal insertion (n=101); both side normal insertion (n=304). Intertwin weight discordancy was classified as mild form (15-25%) and severe form (>25%) by the degree of the discrepancy. Results : The results were as follows; 1. Of these 422 twin sets, 132 (31%) consisted of twin discordancy in weight by 15% or greater (mild form 19%, severe form 12%). 2. There are no significant difference in the frequencies of discordancy between MC twins and DC twins (31.8% vs 31.2%, p=0.97). 3. The prevalence of abnormal cord insertion was 16% and much more frequent in MC placenta than DC placenta (26.5% vs 14%, p=0.001). 4. Although mean gestational age at delivery and mean birth weight were significantly lower in either side abnormal cord insertion group than both side normal cord insertion group (35.7 vs 36.7weeks, p=0.004 : 2317 vs 2475gm, p=0.01), no difference in the frequency of discordancy was observed in these two groups (37.6% vs 29%, p=0.1). Conclusion : The type of placentation and/or abnormal cord insertion were not revealed to affect discordant growth in twin gestation.
임신 제일삼분기 약물 및 진단용 방사선 노출 임신부에서 기형 발생 위험에 관한 근거중심적 상담의 효과
한정열(J . Y . Han),박소연(S . Y . Park),김영미(Y . M . Kim),김진우(J . W . Kim),정상희(S . H . Jung),정영철(Y . C . Chung),최준식(J . S . Choi),안현경(H . K . Ahn),오민정(M . J . Oh),류현미(H . M . Ryu),김문영(M . Y . Kim),궁미경(M . K 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.1
Objective : To evaluate the effectiveness of evidence-based teratogenic risk counseling by relevant medical literature concerning pregnant women exposed to medication or diagnostic radiation during the first trimester. Methods : Between January 2001 and April 2001, 67 pregnant women exposed to medication or diagnostic radiation visited our clinic for teratogenic risk counseling. We counseld the teratogenic risk of their fetus by relevant medical literature.Also, We measured the score to terminate pregnancy and the perceptive risk on their fetus with major congenital anomaly using 10cm visual analogue scale. Results : None of them were exposed to any known teratogenic drugs or radiation in any teratogenic doses. Other physicians had already recommended, to about a third of patients, pregnancy termination. Their perceptive estimation on the risk of major congenital malformation in the general population was 4.6±1.1%. The perceptive risk on their fetus with major congenital anomaly decreased from 39.5±3.1% before consultation to 10.8±1.6% thereafter (P<0.05). Also, their score on the visual analogue scale to terminate pregnancy was 6.4±2.7 before consultation and 9.1±1.6 thereafter. Their tendency to terminate pregnancy significantly decreased after consultation (P<0.05). Conclusion : Evidence-based counseling for pregnant women exposed to medication or diagnostic radiation during the first trimester may prevent unnecessary pregnancy terminations as well as reduce anxiety.
구조 유체 연성해석법을 이용한 용융된 재활용 플라스틱용 메탈 필터의 구조와 유체 압력 해석
김도현(D. H. Kim),김문영(M. Y. Kim),정재일(J. I. Jeong) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
본 논문에서는 용융된 재활용 플라스틱의 불순물을 거르기 위해 사용되는 메탈 필터의 구조, 열 해석을 진행한다. 불순물을 거르기 위해 사용되는 메탈 필터는 표면에 150 μm 의 미세홀이 일정하게 배열되어 있으며 불순물은 미세홀에 의해 걸러지게 된다. 용융된 재활용 플라스틱 유체의 물성은 고온 고압 고점도의 특성을 갖게 되어 메탈 필터의 표면과 미세홀 주변에 높은 응력과 열 변형을 일으키고 구조의 안정성에 큰 영향을 미치게 된다. 따라서 구조 유체 연성 해석을 이용해 메탈 필터의 거동을 해석한다. 유체의 경계 조건이 메탈 필터에 미치는 영향을 해석했고, 유체의 경계 조건 수립을 위해 실제 사용되는 재활용 플라스틱 필터의 압력, 유속, 온도 등의 데이터를 활용하였다. 구조 유체 연성해석에 사용된 CAD 모델은 실물 모델을 기반으로 제작되었으며 해석에 사용하기 위해 단순화했다. 작성된 CAD 모델을 바탕으로 미세홀 주변의 응력 및 열변형 해석을 위해 격자 모델링을 진행하였고, 구조 유체 연성해석을 위한 유체의 격자 모델은 필터의 CAD 모델을 기반으로 필터를 관통하는 유동의 형상을 모델링하였다. 구조유체 연성해석을 이용해 유체의 경계 조건이 메탈 필터에 미치는 영향을 분석하였다. 필터의 중심부와 메탈 필터 경계의 지지점에서 가장 큰 쳐짐이 발생하였고, 미세홀의 입구와 출구에서 가장 큰 응력이 발생했으며 특히 출구부에서 입구부보다 20% 더 큰 응력이 발생하는 것을 확인하였다.