구조용 강재의 용접부는 강재(Base metal, BM), 용접모재(Weld metal, WM), 열영향부(Heat affected zone, HAZ)로 구성된다. 용접부를 구성하는 이들 세 부분의 구조적 성질은 서로 다를 것이므로, 강재의 용접부의 구조 거동은 BM, WM, HAZ로 구성된 복합체의 거동으로 고려할 수 있다. 본 연구에서는 용접부를 구성하는 BM, WM, HAZ 각각의 탄성계수를 나노압입으로 도출하고, 이들의 복합거동(composite action)을 고려한 용접부의 등가탄성계수(equivalent elastic modulus)를 산정하였다.

Since the collapse of historical masonry structures in Europe in the late 1990’s, the interests in understanding the long-term effect of masonry under sustained compressive stresses have increased. That requires combining the significance of time-dependent effects of creep with the effect of damage due to overstress to realize the evolution of cracks and then failure in masonry. Meanwhile, composite analysis of masonry columns was proven effective for realizing ultimate strength capacity of masonry column. In this study, a simplified mechanical model with step-by-step in time analysis was proposed to incorporate the interaction of damage and creep to estimate the maximum stress occurred in masonry. It was examined that the interaction of creep and damage in masonry can accelerate the failure of masonry.

To inject CO2 in geological formations, deep wells that penetrate the formations need to be constructed. The seal integrity of deep wells for CO2 leakage are enhanced by annulus cements. By injecting CO2, brine in formations can be carbonated and the potential degradation of annulus cement in the carbonated brine has been brought up. In this paper, Type G oil well cement (OWC) pastes are hydrated for 28 days. Conditions of geosequestration in a sandstone formation at a depth of roughly 1 km, was simulated by bubbling CO2 into a heated vessel containing brine. The hydrated OWC cylindrical specimens were exposed to this environment. Slices of the cement specimen were taken periodically, during and after exposure to quantify degradation progression. The elastic modulus of the specimens was examined prior to and after exposure. After 28 days of exposure, the degraded depth of specimen was measured as 4.137 mm. The elastic modulus of the specimens was measured as 2.2 GPa and 3.2 GPa prior to and after exposure respectively. Considering a composite action in the partially degraded specimen, the elastic modulus of degraded part can be extracted. The results indicated that the difference of elastic modulus in the partially degraded annulus cements could occur a composite action of deep wells subject to axial load and shear cracks would be generated due to the composite action.

게임 개발에서 에이전트의 행동은 중요한 연구 분야이다. 기존의 에이전트의 설계에서의 문제점은 행동의 재사용, 환경과 상호작용이 가능한 에이전트 구조, 행동 중심의 설계에 대한 연구는 미흡하였다. 제안하는 복합행동 중심의 에이전트의 행동 설계방법은 시나리오 분석 및 상황 표현 단계에서 게임 참여자들간의 의사소통의 도구를 제공하고, 설계 및 구현 단계에서 추상적인 행동을 표현할 수 있고, 향후 게임의 확장 및 유사 에이전트의 설계시 시간 및 비용 절감 효과를 가져 온다. 특히, 본 논문은 게임 개발에서 게임시나리오에 대한 분석 및 이해를 가능하게 하는 행동 중심의 설계 기법을 제안하였다.

In this study, a 3D FE model is developed by which one can analyze the composite action in the composite beam subjected to the hogging moment. Analysis results show that the reinforcement ratio and crack behaviour of the slab are main factors which exert a strong influence on the composite action. The existing experimental results, that the design of partial interaction can be more efficient in designing of shear connection of the composite beams, are indirectly verified by the FE analysis.