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접합부와 보의 상대강성을 고려한 중층 철골 모멘트 골조의 내진해석
하성환,강철규,한홍수,한권규,최병정,Ha, Sung-Hwan,Kang, Cheol-Kyu,Han, Hong-Soo,Han, Kweon-Gyu,Choi, Byong-Jeong 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.5
본 연구는 기둥-보 접합부의 강성에 따른 철골 모멘트 골조의 동적특성의 차이를 파악하는데 목적이 있다. 6층의 철골 모멘트 골조를 설계하였으며, 접합부는 DWA (Double Web-Angle Connection), TSW (Top-and Seat-Angle Connection with Double Web-Angle), FEMA(SAC-Test Summary No.28, Specimen ID : UCSD-6) 접합부를 사용하였고, 완전강접합부의 동적거동특성과 상호 비교 검토하였다. 반강접 접합부의 회전강성은 Chen 과 Kishi 에 의해 제안된 3매개변수파워모델을 사용하여 구하였다. 접합부의 회전 강성을 보의 강성으로 나누어 상대강성으로 정의하여 사용하였다. 모든 골조에 대하여 비선형 정적해석(push over analysis), 반복하중 해석 및 시간이력해석을 수행하였다. 각 접합부의 강성에 따른 내진거동은 층간변위, 소성힌지 및 이력 에너지 분배의 항목별로 비교 분석하였다. This study was conducted to investigate the seismic behavior of steel member resisting frames considering the relative stiffness of the connection and beams. Six-story steel moment frames were designed to study the seismic behavior. The connections were classified into Double Web-Angle connections (DWAs), Top- and Seat-angles with double Web-angles (TWSs), FEMA-Test Summary No. 28, Specimen ID: UCSD-6 (SAC), and Fully Restrained (FR). The rotational stiffness of the semi-rigid connections was estimated using the Three-Parameter Power Model adopted by Chen and Kishi. The relative stiffness, which is the ratio of the rotational stiffness of the connections to the stiffness of the beams, was used. Push-over, repeated loading, and time history analysis were performed for all the frames. The seismic behavior of each frame was analyzed with the story drift, plastic hinge rotation, and hysteretic energy distribution.
최병철 ( Byoung Cheol Choi ),강철규 ( Cheol Gyu Kang ),김석영 ( Sug Young Kim ),이경훈 ( Gyoung Hoon Lee ),노영수 ( Young Su Noh ),송경철 ( Kyoung Cheol Song ),엄기남 ( Ki Nam Eom ),임승욱 ( Seung Ug Im ) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.7
Prenatal Ultrasonographic findings of meconium peritonitis show calcificalion, and abdominal echogenic masses such as pseudocyst. Also, we can find availability of 3 dimensional ultrasonography above these descriptions. We present a case of meconium peritonitis in uterus which was diagnosed by means of prenatal 2D & 3D ultrasonography with brief review of literatures.
양수검사시 천자침의 태반 관통 여부에 따른 임신 경과 비교
노영수(Young Su Noh),김광준(Gwang Jun Kim),이경훈(Gyoung Hun Lee),임성미(Seong Mi Lim),강철규(Cheol Gyu Kang),김석영(Suk Young Kim),박찬용(Chan Yong Park),최유덕(Yu Duk Choi),황병철(Byoung Cheol Whang) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.6
N/A Objective: To evaluate pregnancy outcomes after placental needle penetration during midtrimester diagnostic amniocentesis. Methods: We collected 726 singleton pregnancy cases from 1054 pregnancies of midtrime-ster diagnostic amniocentesis, and analysed pregnancy outcomes after the procedure based on medical records. To compare the outcomes, we divided 726 cases into two groups; placental penetration group by aspiration needle(170 cases) and non-penetration group(556 cases). Results: There were no statistically significant differences between two groups about maternal age and gestational age at the time of procedure, and the distribution of amniocentesis indication, In comparison of complications between two groups after procedure, a. There was no statistically significant difference in amniotic fluid leakage: in penetration group, 1 case (0.58%) and in non-penetration group, 5 cases(0.89%) were observed. b. There was no statistically significant difference in vaginal bleeding: in penetration group, 2 cases !1.18%) and in non-penetration group, 3 cases(0.54%) were observed. c. There was no statistically significant difference in developing abruptio placentae: in penetration group, o case developed and in non-penetration group, one case(0.18%) was observed. d. As for fetal loss, there was no statistically significant difference: in penetration group, 4 cases i'2.35%) and in non-penetration group, 10 cases(1.80%) were occurred. e. As for birth weight, there was no statistically significant difference: in penetration group, 3.26±0.8 kg and in non-penetration group, 3.21±0.9 kg were measured. Conclusion: Our study shows that placental penetration by aspiration needle during diagnostic mid-trimester amniocentesis does not increase the risk of post-procedure complication.
임신중기 원인불명의 융모성 성선자극호르몬 상승과 임신예후와의 연관성
송경철(Kyung Chul Song),이지성(Ji Sung Lee),임승욱(Seung Ug Lim),엄기남(Gi Nam Eom),강철규(Cheol Gyu Kang),최유덕(Yu Duk Choi),김석영(Sug Young Kim),황병철(Byoung Chul Hwang),김광준(Kwang Jun Kim),이의돈(Eui Don Lee),박찬용(Chan Yong 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.8
N/A Objective : The purpose of this study was to compare the neonatal and maternal infectious morbidity between single and multiple courses of antenatal betamethasone treatment in patients with preterm premature rupture of membranes. Methods : One hundred seventy patients who delivered neonates between 28 and 34 weeks' gestation after preterm premature rupture of membranes from January 1992 to July 2000 were reviewed retrospectively. Patients were divided into 3 groups on the basis of the following betamethasone exposures: (1) none (control subjects), (2) betamethasone 4 mg IM, IV simultaneously and then 4 mg IV q 8 hours for 24 hours (single course) and (3) weekly administration after initial single course (multiple courses). All included patients received prophylactic antibiotics for group B streptococci. The statistical analyses were done using χ2 test, Fisher's exact test and one way analysis of variance (ANOVA). Multiple logistic regression analysis was performed to determine the confounding effect of the multiple variables those were considered as risk factors for neonatal sepsis. Results : This study included 67 patients in the control group, 60 patients in the single course group, and 43 patients in the multiple courses group. The latency (p=.0001) was significantly longer in the patients exposed to multiple course than the patients in the control group and those in the single course group. No significant difference was demonstrated in the incidence of neonatal sepsis (p=.881) and postpartum endometritis (p=.619) among the three groups. Neonatal sepsis was significantly associated with clinical chorioamnionitis (p=.022). Conclusion : According to our data, multiple courses of antenatal betamethasone treatment in patients with preterm premature rupture of membranes was not associated with the increased incidence of neonatal sepsis and postpartum endometritis.