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하마오카 원자력 발전소 지진 기록 분석을 통한 지진응답의 공간적 변화 평가
지혜연,하정곤,김민규,함대기 한국지진공학회 2022 한국지진공학회논문집 Vol.26 No.5
In assessing the seismic safety of nuclear power plants, it is essential to analyze the structures using the observed ground motion. In particular, spatial variation in which the characteristics of the ground motion record differ may occur if the location is different within the site and even if the same earthquake is experienced. This study analyzed the spatial variation characteristics of the ground motion observed at the structure and site using the earthquake records measured at the Hamaoka nuclear power plant. Even if they were located on the same floor within the same unit, there was a difference in response depending on the location. In addition, amplification was observed in Unit 5 compared to other units, which was due to the rock layer having a slower shear wave velocity than the surrounding bedrock. Significant differences were also found in the records of the structure’s foundation and the free-field surface. Based on these results, the necessity of considering spatial variation in the observed records was suggested.
L형 보강철물을 사용한 강관 두부보강 시스템의 구조거동에 관한 실험적 연구
이승용,함대연 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-
Steel pipe pile, which is used for the base of structures, need the reinforcing head method to prove enough dynamic performance. Currently there are various reinforcing head methods are used, but most of them have problems of structural complications and heavy charges. Thus, this study is to develop a reinforcing head method for steel pipe piles using screw type bending reinforcement, which can fix piles using nuts, and experimentally prove structural performances. In order to do so, the steel pipe pile reinforcing head method test specimen using screw bending iron was fabricated, and implemented vertical tensile test, vertical compression test, and horizontal loading test. As a result, the test showed that it secured 1.28-3.62 times safety factors for vertical bearing stress, punching shear stress, horizontal bearing stress, and horizontal punching shear stress, that are demanded from the design criteria for highway bridge. From the study, it was confirmed that the structural safety and usability of steel pipe pile reinforcing head method using screw bending iron, which was developed in this study.
Joyce P. Rodriguez,이재민,박준연,강기성,함대현,이상천,이상현 한국응용생명화학회 2017 Applied Biological Chemistry (Appl Biol Chem) Vol.60 No.5
This study was conducted to optimize the extraction conditions of flavonoids from Cirsium japonicum var. maackii (ICF-1). The effects of sample material ratio, solvent concentration, extraction time, solid-to-solvent ratio, and number of extractions on flavonoid extraction efficiency were analyzed. Three flavonoids were specifically investigated: cirsimarin (1), hispidulin (2), and cirsimaritin (3). In single-factor experiments, each variable had a significant effect on the determination of content of compounds 1–3. The optimal conditions for extraction were found to be: mass, 15 g; ratio of spring and fall leaves, 4:1; extraction solvent, 70% ethanol; extraction time, 4 h; solid-to-solvent ratio, 1:20; and number of extractions, 1. The results of the study were used to maximize the potential of ICF-1 samples and optimize the efficiency of the extraction process.
이재민,Joyce P. Rodriguez,이강희,박준연,강기성,함대현,허창기,이상천,이상현 한국응용생명화학회 2017 Applied Biological Chemistry (Appl Biol Chem) Vol.60 No.5
The therapeutic activities of flavonoids from natural plant sources were investigated. The ethanol extracts from the aerial parts of Cirsium japonicum var. maackii (CJM) were tested for aldose reductase inhibition (ARI). Additionally, stepwise polarity fractions and flavonoids from CJM were evaluated for ARI. The ethyl acetate (EtOAc) fraction from CJM showed significant inhibitory effects. The compounds in the EtOAc fraction were identified as the flavonoids-cirsimaritin (1), hispidulin (2), and cirsimarin (3). Based on an ARI assay, the EtOAc fraction and hispidulin (2) exhibited good AR inhibitory activity (IC50 values of 0.21 lg/mL and 0.77 lM, respectively). An HPLC quantitative analysis of different parts of CJM showed that the aerial part collected in the spring season (CJL1) contains the highest total flavonoid content. These results serve as a basis for maximizing the flavonoid yield and for the efficient usage of various parts of CJM. Our results also suggest that CJM could be a useful ARI material for the treatment of various diabetic complications.