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임신성 당뇨 선별검사에서 양성이었으나 확진되지 않은 산모에서 태어난 후기 미숙아들의 예후
이정민 ( Jeong Min Lee ),서보선 ( Bo Seon Seo ),김은선 ( Eun Sun Kim ) 대한주산의학회 2015 Perinatology Vol.26 No.3
Purpose: The aim of the study is to determine whether late preterm infants from normal oral GTT (glucose tolerance test) but positive GCT (glucose challenge test) mothers are associated with adverse postnatal outcome. Methods: A retrospective study was performed from singleton infants who were born at 34+0-36+6 weeks between January 2008 and December 2012 and prenatally checked at CHA Gangnam Medical Center. Infants were categorized into three groups according to the results of 50 g oral GCT and 100 g oral GTT; NG group (normal glucose tolerance group, n=603) vs. GIG group (gestational impaired glucose tolerance group; infants of normal oral GTT but positive GCT mothers, n=77) vs. GDM group (gestational diabetes group, n=52). Neonatal outcomes were compared among the three groups. Results: GIG group showed significantly increased incidence of jaundice compared to NG group (9.6% vs. 19.5%, P=0.031). The number of old mothers (≥35 years at delivery) was significantly higher in GIG group compared to NG group (27.5% vs. 33.8%, P=0.006). After stratification by maternal age, GIG group showed significantly increased respiratory diseases compared to NG group (44% vs. 65.4%, P=0.04). Hypocalcemia and feeding problem increased across the groups (NG vs. GIG vs. GDM; 13.3% vs. 26.9% vs. 32.0%, P= 0.024; 6.0% vs. 11.5% vs. 20.0%, P=0.05, respectively). Conclusion: Late preterm infants of normal oral GTT but positive GCT mothers, especially in older mother, have increased risk of postnatal morbidities such as respiratory distress, jaundice, hypocalcemia or feeding intolerance. Thus, careful follow up may be needed in this group since antepartum period.
비정상 충류화염편 모델을 이용한 비예혼합 난류화염 해석
김성구(Seong Ku Kim),강성모(Sung Mo Kang),서보선(Bo Sun Seo),김용모(Yong Mo KIm) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.3
The present study is focused on modeling the transient behavior of the local flame structure which is especially important for slow reaction processes, such as NOx formation in the radiating flame field. The unsteady flamelet model recently developed has been applied to analyze a steady, turbulent jet flame. Numerical results are compared with experimental data and numerical results of the conventional steady flamelet model. The numerical result reveals that the unsteady flamelet model correctly predicts the nonequilibrium effect upsteam and the subsequent decay of the superequilibrium radical concentrations further downstream.