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주택 정책의 지역별 시장 파급효과 분석을 위한 시뮬레이션 모델 개발
윤인석,박문서,이현수 한국건설관리학회 2019 한국건설관리학회 논문집 Vol.20 No.2
Recently, housing prices have surged, and the government has implemented various regulations, such as finance and taxes. Because of the policy, the nationwide housing price have stabilized, but polarization has occurred. Some argue that regulation can adversely affect the actual demand. Therefore, not only the correlation between market variables but also ripple effect of policy has to be analyzed in policy planning and analysis from a microscopic point of view. In this study, a simulation model was developed by integrating system dynamics for analyzing market structure and agent-based model for modeling decision process of market participants. This research applied the financial regulation and the tax regulation to the model and evaluated the policy effectiveness. This study reveals which feedback dominates according to the policies, which have same purpose. It is because market participants make different decision for each policy. Furthermore, there were other ripple effects not only in the policy target submarket but also in other submarket.
Influence of curing condition and carbonation on electrical resistivity of concrete
윤인석,홍성원,강현구 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.6
The electrical resistivity of air-dried, saturated, and carbonated concretes with different mixture proportions was monitored to evaluate and quantify the influence of the age of the specimen, carbonation, and curing condition. After 28 days of curing, four prepared specimens were stored in a vacuum chamber with 5% CO2 for 330 days to make carbonated specimens. Four of the specimens were placed in water, and four specimens were cured in air until the end of the experiments. It was observed that the electrical resistivity of the carbonated specimens increased as carbonation progressed due to the decrease of porosity and the increase of hydrated products. Therefore, in order to estimate the durability of concrete, its carbonation depth was used as the measurement of electrical resistivity. Moreover, an increase of electrical resistivity for air-dried and saturated concretes was observed as a function of age of the specimen. From the relationship between chloride diffusivity provided by Yoon et al. (2007) and the measurements of electrical resistivity, it is expected that the results well be of significant use in calibrating chloride diffusivity based on regular measurements of electrical resistivity during concrete construction.
윤인석,남진원 한국구조물진단유지관리공학회 2014 한국구조물진단유지관리공학회 논문집 Vol.18 No.6
The electrical resistivity of concrete can be related to two processes involved in corrosion of reinforcement: initiation (chloridepenetration) and propagation (corrosion rate). The resisistivity of concrete structure exposed to chloride indicates the risk of earlycorrosion damage, because a low resistivity is related to rapid chloride penetration and to high corrosion rate. Concrete resistivityis a geometry-independent material property that describes the electrical resistance, which is the ratio between applied voltage andresulting current in a unit cell. In previous study, it was realized that the resistivity of concrete depended on the moisture contentin the concrete, microstructural properties, and environmental attack such as carbonation. The current is carried by ions dissolvedin the pore liquid. While some data exist on the relationship between moisture content on electrical resistivity of concrete, verylittle research has been conducted to evaluate the effect of chloride on the conduction of electricity through concrete. The purpose of this study is to examine and quantify the effect of chloride content on surface electrical resistivity measurementof concrete. It was obvious that chloride content had influenced the resistivity of concrete and the relationship showed a linearfunction. That is, concrete with chloride ions had a comparatively lower resistivity. Decreasing rate of resistivity of concrete wasclear at early time, however, after 50 days resistivity was constant irrespective of chloride concentration. Conclusively, this papersuggested the quantitive solution to depict the electrical resistivity of concrete with chloride content. 콘크리트의 전기저항은 철근부식 개시 이전인 잠복기와 철근부식되는 진전기 두과정과 유관된다. 염소이온에 노출된 콘크리트 구조물의전기저항은 초기 부식율의 위험도를 표현할 수 있는데, 낮은 전기저항은 빠른 염소이온 침투와 높은 부식속도를 의미하기 때문이다. 콘크리트의 전기저항은 인가된 전압과 전류간의 비율인 전기저항으로 표현된다. 이전의 연구에 의하면 콘크리트의 전기저항은 콘크리트내 수분량, 미세구조 및 탄산화 등에 크게 의존하였다. 습윤량과 전기저항의 관계를 다룬 연구가 적지만 존재하는 반면, 염소이온이 전기저항에 미치는연구를 행한 연구는 매우 드물다. 본 연구의 목적은 염소이온이 콘크리트의 전기저항에 미치는 영향을 고찰하는 것이다. 실험결과에 의하면 염소이온량은 전기저항을 떨어뜨리는 것으로 나타났으며 이는 선형의 관계가 성립되었다. 초기 양생 50일 이전까지 전기저항의 감소추세는 뚜렷하였으며, 이후로는 염소이온량과 상관없이 일정하였다. 결과적으로 본 연구는 염소이온량을 함유한 콘크리트의 전기저항을 표현하는데 결정적인 방법을 제안하였다.