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FRP 보강 RC기둥의 내진성능 향상에 관한 실험적 연구
최성모 한국복합신소재구조학회 2019 복합신소재구조학회논문집 Vol.10 No.1
In order to develop an effective seismic strengthening method for existing concrete structure, structural tests of aramid FRP reinforced RC columns and polyester reinforced RC columns with SRF method are performed. The test variables were strengthening methods of aramid sheet and strip and thickness of polyester belt. The test results were evaluated by comparing strength and energy dissipation capacities of non-reinforced and reinforced specimens. The test result comparison showed that reinforcement of RC columns with aramid sheet reinforcement and SRF method is effective. 기존 콘크리트 구조물에 대한 효과적인 내진보강 개발을 위하여 아라미드 FRP 보강 기둥 및 SRF 공법을 사용한 폴리에스테르 보강 RC기둥의 구조실험을 수행하였다. 실험 변수는 아라미드 시트의 두께와 스트립 보강 유무, 그리고 SRF공법폴리에스테르 벨트의 두께이다. 실험결과는 무보강 실험체와 보강 실험체의 강도와 에너지 소산능력을 비교하여 평가하였다. 실험 결과 아라미드 섬유 보강과 SRF공법 보강이 RC기둥의 내진성능 향상에 효과적임을 확인하였다.
ST 비상승 급성 관상동맥 증후군 환자에서 고 위험군 추정 및 조기 사망에 대한 예측인자로서 D-dimer의 유용성
최성모,나준호,이기호,이경룡,홍대영,백광제,박상민,박상오 대한응급의학회 2014 大韓應急醫學會誌 Vol.25 No.6
Purpose: The aim of the study is to evaluate the efficacy ofinitial plasma D-dimer levels measured in the emergencydepartment (ED) in prediction of early 28-day mortality andhigh-risk patients for early invasive treatment in patients withNon-ST elevation acute coronary syndrome (NST-ACS). Methods: This is a retrospective clinical study of NST-ACSpatients in the ED. All patients were managed according tothe 2010 ACLS guidelines. EKG, cardiac markers, and Ddimerwere analyzed. All data were collected via electronicmedical records. The two major endpoints were 28-daymortality and high-risk patients who were defined as caseswith one of the following: refractory ischemic chest discomfort,recurrent/persistent ST deviation, ventricular tachycardia,hemodynamic instability, and signs of heart failure. Weassessed the relationship between initial D-dimer levels,and high-risk patients, and 28-day mortality. Results: A total of 390 patients were analyzed. There were25 high-risk patients (6.41%) and 10 non-survival cases(2.56%). The median (inter-quartile ranges) D-dimer valuewas higher in high-risk patients than in non-high riskpatients (1.36 [0.57 to 2.30] vs. 0.31 [0.23 to 0.53] ug/dL;p<0.0001). Area under curve (AUC) in Receiver-operatorycharacteristic (ROC) curve for D-dimer in high-risk patientswas 0.834 (95% confidence interval: 0.750-0.920) with theoptimum cutoff value of 0.475ug/dL with a sensitivity of 84%and a specificity of 71%. The median value of D-dimer innon-survival cases was higher than in survival cases (1.17[0.84 to 18.46] vs. 0.33 [0.23 to 0.56] ug/dL; p<0.0001). AUC for D-dimer in predicting 28-day mortality was 0.837(95% CI: 0.710-0.964) with the optimum cutoff value of 0.98ug/dL with a sensitivity of 80.0% and a specificity of 86.3%. Conclusion: The D-dimer level in the initial state might behelpful in predicting high-risk patients for early invasive treatmentor 28-day mortality in patients with NST-ACS in the ED.
섬유보강플라스틱(FRP) 스트립으로 보강한 철골보의 휨거동에 관한 실험적연구
최성모,박재우,Choi, Sung Mo,Park, Jai Woo 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.2
본 연구에서는 콘크리트 섬유보강플라스틱(FRP)로 보강된 철골보의 정적 휨하중상태에서 휨거동에 관한 실험결과를 제시하였다. 아라미드섬유 스트립과 탄소섬유 스트립으로 보강된 4개의 실험체를 제작하였으며, 1개의 기준실험체를 제작하였다. 이중 두 실험체는 부분보강방식으로 보강되었다. H빔은 두 종류의 파괴모드를 가지고 있는데, (1) 부분보강 실험체에서는 FRP 스트립이 탈락(debonding)되는 파괴모드를 보이고 있으며, 전면보강 실험체에서는 FRP 스트립이 파단(rupture)되는 거동을 보이고 있다. 실험결과 16%의 휨내력 상승효과를 관찰하였다. This paper presents the experimental results of flexural behavior of steel beam strengthened with fiber reinforced polymer plastic (FRP) strips subjected to static bending loading. Four H beams were fabricated strengthened with aramid strips and carbon strips and one control specimen were also fabricated. Among them two specimens were strengthened with partial length. The H-beams had two types of failure mode, depending on the length of the FRP strips:(1) strip debonding in beams with partial length reinforcement and (2) strip rupture in beams with full length reinforcement. From the test, it was observed that maximum increase of 16% was also achieved in bending-load capacity.
최성모,김진호,여진철 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.9
The higher a building, the more concrete-filled square hollow tubular section columnbeam connections are applied. The RC core and exterior concrete-filled tubular (CFT) columnbeam pinned connection is one of the structural systems that support lateral load. If this structural system is used, due to the minimal CFT column thickness compared to that of the CFT column width, the eccentric distance of the column flange surface and connection degrades the strength by the local moment on the column flange surface. This study performed a finite element analysis on the CFT columnbeam pinned connection to determine the strength degradation of the CFT column. The column’s width and thickness were used as variables for the analysis. To guarantee the reliability of the finite element analysis, an actual-size specimen was fabricated and tested. The yield line theory was applied in the proposed strength formula for the CFT columnbeam pinned connection. Based on the study’s results, the strength improved with the increase in the column’s size, which suggested the limitations of the concrete-filled square tubular column type without internal reinforcement. If the limitation value is not satisfied, the reinforcement inside the column is mandatory. The form of the horizontal stiffener was proposed along with the strength increase of the concrete-filled square tubular column and simplification of its fabrication process. The formula for the strength of the CFT columnbeam pinned connection, which factors the strength decline, is therefore proposed both for columns with and without internal horizontal reinforcement.
사물탕(四物湯)과 사군자탕(四君子湯)의 전탕(煎湯)방법의 차이에 관한 GC 분석 실험
최성모,Choi, Sung-Mo 대한동의생리학회 2006 동의생리병리학회지 Vol.20 No.6
The GC pictures were taken to investigate the difference of the Samul-tang and Sakunja-tang, each prepared by the different boiling methods, which were the traditional method(using cover), using the condenser, and using no cover. For Samul-tang, there was not much difference in the GC pictures, but the one pick(rt about 7 min.) of the picture by the method using the condenser had the higher intensity than those in the pictures by other methods. For Sakunja-tang, the GC pictures of the method using the condenser had shown a lot of the peaks and the very high intensity, which were much better than those of the picture by the traditional method. However, the GC pictures of the method by using no cover had shown almost nothing.
최성모,이호춘 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
It is highly demanded to increase Ni content in LiNiXCoYMnZO<sub>2</sub> (NCM) cathode materials to maximize the energy density of Li-ion Batteries (LIBs). However, high Ni-content NCM suffers from poor thermal stability. In this study, we demonstrate that the metal (Ni, Co, Mn) dissolution behaviors of various Al<sub>2</sub>O<sub>3</sub>-coated NCM 622 powders are greatly related to their acid and total surface free energy (SFE). The amounts of Ni, Co and Mn ion dissolved from the NCM powders during 60°C storage are measured by the atomic absorption spectroscopy(AAS). Then, their SFE components are analyzed by the adsorption method with three probe liquids. Strong linear correlation is observed between the metal dissolution and the surface free energy (SFE).