균 열전 파 현상은 항상 형상이 변화하는 대표적인 문 제줌의 하나이다. 본 연 구는 준-정적 균열전파 현상올 해석하기 위 하여 듬로네이 특성을 이용한 국지 요소재편 알고리즘을 제시하였다. 이 알고리즘은 요소 재편성 과 세 분 화를 모 두 수행할 수 있도록 준비되었다. 적용예로 M 적분볍올 사용하여 주로 혼합 모우드로 균열이 전파되는 스폴링 현상을 해석하였다.

유 한요소 생성기볍 중 삼 각요소 셀 생성하는 들로네이-보로노 이 기법은 반복되는 국지적 요소재 편 을 통하여 요소망을 완성하는 기법 으보 적응유 한요소 볍의 적 용에 이점이 되 고 있다. 이 방볍의 요체 는 재편대상이 되 는 요소 군 의 형성과 이 륜 대 서; ‘ J: -. ~ 요소생산 의 과 정이다. 이 를 간 편하게 해 결 하는 방볍으로 요소의 인접성을 나 타내 는 행렬 을 새 푼이 노 입하 -ι 이에 따르는 단순 알 고 리 즘올 제시하여 일 반 PC 급 이용자들도 관 요소 생성 기법 을 이용 한 적 응-유한요 소해석의 실질 적 인 적 용가능 성 을 제 고 하였다.

The selection of fnancial assets within households has gained increasing prominence in the context of China’s economic development. This paper systematically reviews existing literature, both domestic and international, focusing on family heterogeneity and the infuence of external factors. It critically assesses the advancements made in understanding the determinants of family fnancial asset choices while also acknowledging the limitations in current research. Building upon this comprehensive review, the paper identifes three promising avenues for future exploration. Firstly, there is a need for research delving into the impact of the digital economic environment on family fnancial asset choices. Secondly, understanding how macroeconomic systems shape these decisions is crucial for a holistic perspective. Lastly, examining the heterogeneity among family members and its influence on financial asset choices offers a nuanced understanding of this intricate decision-making process. The insights presented in this paper are invaluable for both academic research and practical applications related to family fnancial asset selection.

After the major radioactivation structures (RPV, Core, SG, etc.) due to neutron irradiation from the nuclear fuel in the reactor are permanently shut down, numerous nuclides that emit alpha-rays, beta-rays, gamma-rays, etc. exist within the radioactive structures. In this study, nuclides were selected to evaluate the source term for worker exposure management (external exposure) at the time of decommissioning. The selection of nuclides was derived by sequentially considering the four steps. In the first stage, the classification of isotopes of major nuclides generated from the radiation of fission products, neutron-radiated products, coolant-induced corrosion products, and other impurities was considered as a step to select evaluation nuclides in major primary system structures. As a second step, in order to select the major radionuclides to be considered at the time of decommissioning, it is necessary to select the nuclides considering their half-life. Considering this, nuclides that were less than 5 years after permanent suspension were excluded. As a third step, since the purpose of reducing worker exposure during decommissioning is significant, nuclides that emit gamma rays when decaying were selected. As a final step, it is a material made by radiation from the fuel rod of the reactor and is often a fission product found in the event of a Severe accident at a nuclear power plant, and is excluded from the nuclide for evaluation at the time of decommissioning is excluded. The final selected Co-60 is a nuclide that emits high-energy gamma rays and was classified as a major nuclide that affects the reduction of radiation exposure to decommissioning workers. In the future, based on the nuclide selection results derived from this study, we plan to study the evaluation of worker radiation exposure from crud to decommissioning workers by deriving evaluation results of crud and radioactive source terms within the reactor core.

In Natural Analogue Study, Concrete is one of the important engineering barrier components in the Multi-thin wall concept of radioactive waste disposal and plays the most important role in disposal sites. The concrete barrier at the disposal site loses its role as a barrier due to various deterioration phenomena such as settlement, earthquake, and ground movement, causing the disposed waste to leak into the natural ecosystem. Some of the key factor is deterioration triggered by sulfate attack. Concrete deterioration induced by sulfate is commonly manifested in an extensive scale when a concrete structure makes contact with soil or water, aggravating its performance. In this study, an accelerated concrete deterioration evaluation experiment was performed using a total of three experimental methods to evaluate the reaction between concrete and water. The first experiment was a deterioration evaluation using Demi. Water, the second was a deterioration evaluation using KURT groundwater after extraction, and the last experiment was a concrete deterioration evaluation using KURT groundwater and sodium sulfate. For all of these experiments, accelerated concrete deterioration experiments were conducted after immersion for a total of 365 days, and specimens were taken out at 30-day intervals and characterization analysis such as SEM and EDS was performed. Experimental analyzes have shown that various chemical species are generated or destroyed over time. In the future, we plan to continue to conduct a total of three concrete deterioration evaluation experiments above, and additionally evaluate the chemical reaction between bentonite and concrete.

This study investigates the behavior of bentonite, used as a buffer material in deep geological disposal systems, in the context of pore morphology under the influence of field-collected groundwater conditions. The bentonite was processed into block form using cold isostatic press (CIP) and subsequently analyzed for its pore morphology in situ using synchrotron X-ray computed tomography (CT) within the field-collected groundwater environment. Bentonite buffers play a critical role in deep geological disposal systems by preventing contact between disposal containers and groundwater. Bentonite typically exhibits swelling upon contact with water, forming few layers of water molecules between its structural layers. However, the presence of ions such as K+ and Cl- can lead to a sharp reduction in swelling pressure. Loss of swelling pressure could negatively impact the integrity of future deep geological disposal systems, making its assessment crucial. This study involves processing various types of bentonite, including natural Na-type bentonite, into block forms and subjecting them to exposure in both deionized water and field-collected groundwater conditions. Internal pore morphology changes were measured using Xray CT technology.