For the OPR1000, a standard power plant in Korea, an analytical model of the containment building considering voids and deterioration was built with multilayer shell elements. Voids were placed in the vulnerable parts of the analysis model, and the deterioration effects of concrete and rebar were reflected in the material model. To check the impact of voids and deterioration on the seismic performance of the containment building, iterative push-over analysis was performed on four cases of the analytical model with and without voids and deterioration. It was found that the effect of voids with a volume ratio of 0.6% on the seismic performance of the containment building was insignificant. The effect of strength reduction and cross-sectional area loss of reinforcement due to deterioration and the impact of strength increase of concrete due to long-term hardening offset each other, resulting in a slight increase in the lateral resistance of the containment building. To determine the limit state that adequately represents the seismic performance of the containment building considering voids and deterioration, the Ogaki shear strength equation, ASCE 43-05 low shear wall allowable lateral displacement ratio, and JEAC 4601 shear strain limit were compared and examined with the analytically derived failure point (ultimate point) in this study.

The extracts of AS contain in alloxanthin, halocynthiaxanthin, astaxanthin and 13 kinds of carotenoids. The aim of the study was to assess the anti-oxidant activity and cell viability of AS. The anti-oxidant activity was determined by using DPPH radical inhibition activity and superoxide dismutase (SOD)-like activity. The results of cell viability assay showed that the extracts from AS were cytotoxic at concentrations above 5.0 ㎎/㎖. This study was designed to examine inflammation induced by LPS, protection effect by UVB and the toxicity of Ascidian shell extract(ASE) as a functional cosmetic ingredient. Evaluation of embryo toxicity resulted in embryo coagulation and mortality when treated at 5.0, 10.0, 20.0 ㎎/㎖. At the lowest concentration of 1.0 ㎎/㎖, hatchability resulted in 100.0 % rate. The results of arrhythmia measurement in larvae showed similarity to the evaluation of embryo toxicity. This result demonstrated that toxicity is present at concentrations greater than 5.0 ㎎/㎖. The protective effect of ASE on LPS and UVB-induced in the zebrafish was investigated. Intracellular reactive oxygen species(ROS) generated by the exposure of zebrafish to LPS, UVB-radiation were significantly decreased after treatment with ASE at 0.1 ㎎/㎖. As a result, ASE similarly reduced UVB-induced ROS generation and cell death in live zebrafsih. Therefore, it is suggested that ASE has anti-Inflammatory effects and can possibly be used as a functional substance for skin protection in the future.

This paper is a study on the experiment and elasto-plastic discrete limit analysis of reinforced concrete circular cylindrical shell by the rigid-bodies spring model. In the rigid bodies-spring model, each collapsed part or piece of structures at the limiting state of loading is assumed to behave like rigid bodies. The present author propose new discrete elements for elasto-plastic analysis of cylindrical shell structures, that is, a rectangular-shaped cylindrical element and a rhombus-shaped cylindrical element for the improvement and expansion of this rigid-bodies spring model. In this study, it is proposed how this rigid element-bodies spring model can be applied to the elasto-plastic discrete limit analysis of cylindrical shell structures. Some numerical results of elasto-plastic discrete limit analysis and experimental results such as the curve of load-displacement and the yielding and fracturing pattern of circular cylindrical shell under horizontal load are shown.

본 연구에서는 노심지지배럴을 축솜형의 원통형 쉘로 이상화하여, 그의 모드 특성을 고찰하였다. 쉘의 모드 해석은 사용코드인 ANSYS를 이용하였으며, 일반적으로 사용하고 있는 요소인 SHELL61과 SHELL63을 이용하여 해석을 수행하였고 이들의 특성을 비교하였다. 또한 두께에 따른 모드 특성을 검토하여 쉘 요소의 사용 한계를 규정하였다. 한편 구멍이 있는 쉘과 없는 쉘의 모드 특성을 조사하여 구멍 및 그의 위치가 모드 특성에 미치는 영향을 파악하였다. 이들 모든 결과를 실험 및 이론에 의한 결과와 비교하였다.

p- 收敬有限要素法은 補間~f!{의 ìxf!{ p를 증가시키는 동안 해석하려 는 領域의 分劃올 固定시키는 有限要素해 석 의 새 로 운 접 근 방볍이다 이 논분에서 는 混合寫像함수에 기 초 한 새로 운 p-~~ p皆層要素 뜰 이용한 젤 모 델 의 컴퓨터 i훌行에 초점 올 두었다. Pinch Test 문 제와 원 통 형 헬지붕문제 를 통해 제안 된 웰 모 델 의 剛體運動， round-off 오차， 그 리 고 收飯性둥 이 검토되 었다