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송경철(Song Kyung-Chul),방중석(Bang Jung-Seok),박수희(Park Su-Hee),정경수(Chung Kyung-Soo),최성모(Choi Sung-Mo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Although an unprotected CFT column with a high axial-load ratio can be used to secure fire resistance for two hours or less in low-rise buildings, it does not satisfy the three-hour-long fire resistance required in high-rise buildings. Accordingly, so that the unprotected CFT column could be used for high-rise buildings, additional measures for the improvement of its fire resistance should be suggested. In this regard, the use of a CFDST (Concrete-filled Double Skin Tubular) column as a measure for improving the fire resistance of the unprotected CFT column was suggested in this paper. A fire resistance test was conducted on an unprotected CFT column and a CFDST column in real scale, under a load. Through such test, the effect of the CFDST column on fire resistance was evaluated and then compared with that of a variant shape of the cross-section of a steel column.
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
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.
송경철(Kyung Chul Song),김광준(Gwang Jun Kim),황유진(Yu Jin Whang),최수란(Su Ran Choi),이순표(Soon Pyeu Lee),황병철(Byung Chul Whang),이의돈(Eyi Don Lee) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.6
Objective : Fragile X syndrome is the most common form of familial mental retardation, attributable to (CGG)n expansion in the FMR1 gene. This study was undertaken to ascertain the distribution of FMR1 CGG repeat in the general Korean women and to identify ethnic difference in FMR1 CGG repeat number. Material and method : Between January 1999 and December 1999, we evaluated 1,000 low risk women who visited Gachon Medical School Hospital. DNA samples were extracted from the venous bloods by routine methods, and G-C specific Polymerase Chain Reaction (PCR)s were performed to evaluate FMR1 CGG repeat number. Results : Mean FMR1 CGG repeat number was 26.9 (6-50), single PCR bands were detected in 776 cases (77.7%). There were two more bands in 22.3% of the cases. Most of the cases are located between 21 and 35 repeats, especially 21-25 repeats. The pattern of distribution of CGG repeat is dispersed. In 13 cases, we could not obtain the PCR results. Conclusion : Low risk of transmission rate of the FRX in Korea can be expected.
일정 축력을 받는 콘크리트충전 원형 강관기둥의 내화성능 평가
박수희,송경철,류재용,정경수,최성모,Park, Su Hee,Song, Kyung Chul,Ryoo, Jae Yong,Chung, Kyung Soo,Choi, Sung Mo 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.5
In this research, the fire resistance of Concrete-Filled Circular Steel Tube Columns (CFT) was evaluated by numerical analysis. As the materials of CFT columns, the steel of SPSR 400 grade and the concrete of 27.5MPa, 37.8MPa strengths were used. Significant parameters,such as concrete strength, axial load, and cross-sectional dimensions were determined. To verify the accuracy of the numerical analysis,the analysis results were compared with the former experiment results. The effect of the fire resistance time, axial load ratio, cross-sectional dimensions and concrete strength was evaluated by comparison with the fire resistance of the square CFT columns. This research showed that the structural behavior and fire resistance from the findings of numerical parametric studies showed a similarity to that of the experimental results. Therefore, this numerical analysis is reasonable in estimating the fire resistance of the circular CFT column. 본 연구에서는 콘크리트충전 원형강관(원형 CFT)기둥의 내화성능을 평가하기 위하여 수치해석을 수행하였다. 강관은 SPSR 400 강재를 사용하였으며 강관 내에는 27.5MPa와 37.8MPa 강도의 콘크리트를 사용하였다. 콘크리트 강도, 작용 축력, 단면 직경을 변수로 설정하였다. 수치해석의 정확성을 검증하기 위하여, 기존의 각국 내화성능설계식들에 의한 계산 결과값과 비교 평가 하였다. 또한, 기존의 실대 원형 CFT기둥의 내화성능 평가 실험 결과와 함께 비교 분석하여 수치해석의 타당성을 검증하였다. 원형 CFT기둥의 내화실험 및 수치해석적 연구를 통해 도출된 내화저항시간과 축력비, 단면직경, 콘크리트 강도의 영향을 각형 CFT기둥의 내화성능과 비교 분석하여 각 영향인자들의 영향을 평가하였다. 본 연구의 수치해석적 연구는 실험결과와 비슷한 거동 및 내화성능을 보였다. 따라서 본 연구에서의 수치해석에 의한 CFT기둥의 내화 성능 예측은 타당하다고 판단된다.
현동림(Dong-Lim HYUN),송경철(Kyung-Chul SONG),김은길(Eun-Gil KIM),김종훈(Jong-Hoon KIM) 한국수산해양교육학회 2011 水産海洋敎育硏究 Vol.23 No.4
This thesis is the study about application development for management obesity and personal health matters systematically based on Android smart phone system. Growing obesity problem for students organized by the lack of a device or program to manage at home has been favored as a serious problem. Currently developed smart phones has come into wide use by portable features and many applications. And to support populations of these features smart phones will be available for obesity management in your home without any equipment using. Accordingly, this paper is the study about application development for management obesity for growing students at home based on the latest smart phone platform Android.
건설사업관리 분야에서 BIM적용을 통한 도서의 적합성 검토 사례
박영진 ( Park Young-jin ),송경철 ( Song Kyung-chul ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
The purpose of this case study is to reduce the flaw and reconstruction occur at the level of construction by determining the propriety of estimate and error on a drawing and specification at working design level through case studies of BIM application at the level of design review. As a preliminary to apply BIM technology, it is needed to review the drawing, and then it is required to define BIM range by selecting the section in which construction error occurs frequently except for the type of part that is constructed repeatedly. At the execution level, the drawing is reviewed vertically, horizontally and spatially by proceeding structure and finish modeling on the defined BIM range, and also the propriety of estimate and error on the drawing and specification are examined. We aim to raise the completion rate, improve quality of construction, reduce the cost for construction and shorten period of construction by preparing for the error on the drawing and specification in advance through this review procedures.
콘크리트충전 강관기둥의 내화성능에 대한 국내 구성재료 (강재, 콘크리트)의 고온특성 영향
박수희(Park Su-Hee),송경철(Song Kyung-Chul),정경수(Chung Kyung-Soo),김흥열(Kim Heung-Youl),원용안(Won Yong-Whn),최성모(Choi Sung-Mo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The behaviour of CFT columns exposed to fire is dependent on the thermal and mechanical properties of CFT materials. In this research, the Korean test's thermal properties model of the CFT materials/steel and concrete) is compared with the four model(Eurocode model, AIJ model, T.T. Lie model, J. Yin model) of the outside the country to estimate the thermal properties of the Korea test's model. Using the thermal properties, the numerical analysis was performed to estimate the fire resistance of the CFT structures. We evaluated the actual effect by the thermal and mechanical characteristics of the materials. Through this research, the temperature calculated from test model was overestimated than other models. It is because the thermal diffusivity of domestic concrete test model is the highest. Also, test model was suddenly collapse without sufficient axial deformation. It is because the thermal diffusivity of test model is higher than the other models. And it is because stress-strain curves decreased suddenly after yielding