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Effect of Structural Type of Clay Minerals on Physical Properties of Mountainous Grassland Soils
Seyeong Choi,Man Park 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.6
Soil amendment, especially addition of clay minerals, has been widely conducted to improve the physical and chemical properties of cultivated soils. However, there are no systematic studies on the effects of the structural type of clay minerals added. This study was conducted to investigate the effects of structural type of clay minerals on physical properties of soils. Two experimental soils, layer-dominant and granule-dominant ones, were mixed with either a layer-type smectite or a granule-type zeolite at a level of 2.0 wt%. It was observed that water permeability of soils was decreased by smectite whereas not significantly changed by zeolite. This effect was much greater in layered clay-dominant soil than in granular clay-dominant soil. Our results clearly indicated that the relationship of structural type between a soil and an amendment plays a decisive role in the soil properties. Therefore, it is highly recommended that the structural types of both soil and amendment be taken into consideration for soil amendment by clay minerals.
Effect of Structural Type of Clay Minerals on Physical Properties of Mountainous Grassland Soils
Choi, Seyeong,Park, Man 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.6
Soil amendment, especially addition of clay minerals, has been widely conducted to improve the physical and chemical properties of cultivated soils. However, there are no systematic studies on the effects of the structural type of clay minerals added. This study was conducted to investigate the effects of structural type of clay minerals on physical properties of soils. Two experimental soils, layer-dominant and granule-dominant ones, were mixed with either a layer-type smectite or a granule-type zeolite at a level of 2.0 wt%. It was observed that water permeability of soils was decreased by smectite whereas not significantly changed by zeolite. This effect was much greater in layered clay-dominant soil than in granular clay-dominant soil. Our results clearly indicated that the relationship of structural type between a soil and an amendment plays a decisive role in the soil properties. Therefore, it is highly recommended that the structural types of both soil and amendment be taken into consideration for soil amendment by clay minerals.
최세영 ( Seyeong Choi ),김제선 ( Jesun Kim ) 사단법인 아시아문화학술원 2019 인문사회 21 Vol.10 No.4
이 연구의 목적은 고령사회로 진입한 우리나라에서 대학생이 그들의 부모나 조부모에 대한 부양의식 수준은 어느 정도이며, 조부모와의 친밀감이 이러한 부양의식에 어떠한 영향을 미치는지를 분석하는 것이었다. 연구방법으로는 서울 소재 4년제 대학교 중 4개 학교 재학생을 대상으로 위계적 회귀분석을 실시하였다. 분석결과, 대학생의 부양의식 정도는 약간 높은 수준으로 나타났고, 조부모와의 동거경험에 대해서는 부양의식 중 신체적 부양의식에서만 유의미한 차이가 있는 것으로 나타났다. 그리고 조부모와의 친밀감의 변수가 포함되는 경우 통계적 유의수준과 설명력이 높았으며, 종속변수인 부양의식에 미치는 영향력이 더욱 큰 결과를 보였다. 이 연구의 제언은 고령사회의 노인부양 부담을 위해 조부모와의 동거경험과 노인 친밀감을 높이는 방향으로서 대학 교육과 더불어, 현대사회의 새로운 가족의 기능을 위한 가족정책 강화, 그리고 노인부양의 사회적 부담을 청년세대와 노인세대가 같이 해결하고자 하는 서로 간의 노력 등을 제시하였다. The purpose of this study was to analyze empirically how the intimacy of grandparents perceived by university students affected the awareness of support in the aged society in South Korea. The subjects of this study were students attending four universities in Seoul and the analysis method utilized hierarchical regression analysis. The results of the study are as follows. first, It was 3.95 points (S.D. of 47) on the basis of 5 points, and was different according to personal characteristics. Second, when It is added as a variable, the research model has a statistically significant value and the explanatory power was very high. And, the influence on the dependent variable becomes bigger. The suggestions for supporting the elderly in the aged society are to increase intimacy with the elderly to provide education about social care in college as a direction, to change the new family function in modern society through active family policy, to improve the relationship between the young generation and the elderly generation for the burden of social support.
호스트 기반 분산형 이동성 관리 기술에서 안전하고 효과적인 바인딩 업데이트
이세영(Seyeong Lee),최형기(Hyoung-Kee Choi),김이진(EJin Kim) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.2
모바일 트래픽이 급격히 증가함에 따라 모바일 기기가 끊김 없이 통신하기 위한 이동성 관리 기술로써 DMM(Distributed Mobility Management)이 제안되었다. DMM은 코어 네트워크에서 엣지 네트워크로 이동성 관리를 분산하여 낮은 지연으로 안정적인 바인딩 업데이트를 가능하게 한다. 그러나 DMM 시스템에는 여전히 네트워크상의 지연 문제와 세션에 대한 보안상의 문제가 존재한다. 본 논문에서는 기존 DMM 시스템에 존재하는 문제점을 지적하고, 이를 해결하기 위해 MN (Mobile Node)이 직접 인증에 참여하여 올바른 상호 인증이 이루어지는 새로운 프로토콜을 제안한다. 또한, 성능 분석을 통해 보안상의 향상뿐만 아니라 성능상의 향상이 존재함을 확인하였다. As mobile traffic increases rapidly, DMM (Distributed Mobility Management) has been proposed as a mobility management technology for seamless communication of mobile devices as mobile traffic increases rapidly. the DMM distributes mobility management from the core network to the edge network, enabling stable binding updates with low latency. However, the DMM still have network delay and security problems for sessions. In this paper, we point out the problems existing in the DMM and propose a new protocol in which the MN (Mobile Node) directly participates in authentication and mutual authentication is correctly performed to solve this problem. We demonstrate not only security improvements but also performance improvements with performance analysis