• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.23-24
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• 2020

In this study, effect of surface modification of waste glass for fine aggregates on the mechanical properties and alkali silica reaction of mortar was analyzed. As a result, it was confirmed that the incorporation of waste glass fine aggregate decreases the mechanical properties of the mortar and increase the alkali silica reaction expansion. On the other hand, the surface modification of the waste glass fine aggregate is effective in improving this problem. However, unlike green and brown waste glass, it is judged that an additional experiment to determine the cause is necessary for white waste glass where alkali silica reactive expansion occurs extremely.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.56-57
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• 2021

Apartments, an intensive residential type, exist and are supplied in large quantities regardless of the size of the city. The value of an apartment is affected not only by the surrounding infrastructure, but also in terms of maintenance. Defects that occur in apartments come in various forms, and mainly poor finishing accounts for 60% of the defects. Among them, tile defects accounted for a large proportion and were found to be caused by several factors. This paper analyzed the influence of each factor considering the coefficient of thermal expansion affecting tile defects according to the domestic seasonal climate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.195-196
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• 2023

In this study, the mechanical properties, alkali-silica reaction(ASR) expansion and residual mechanical properties after ASR of waste glass fine aggregate(GS) mortar according to mineral mixture were evaluated. As a result, it was found that the mineral mixture reduces the ASR expansion. However, mechanical properties and residual mechanical properties have decreased.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.143-146
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• 1999

This study is intended to investigate the properties of expansion of concrete under various curing environment with expansive additives. In construction field, expansive additives, which are anaiable to prevent from the diverse cracks caused by drying shrinkage are not expected to accomplish the expantion we expected because of both the absence of the know ledge change, loss of weight and dynamic of elasticty under various unit contents of expansive additives and curing condtion.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.183-186
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• 1998

Axial magnetic field generated by special electrode construction in vacuum interrupters is used to extinguish electric plasma arcs. This investigation by FDM should prove to what extent the magnetic field might influence on the arc expansion. The calculated results show that the stronger magnetic field induced the lesser radius of arc plasma. This study will help to offer good data in design of vacuum interrupters.

• 전기의세계
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• 제29권4호
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• pp.256-259
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• 1980

A singular pertubation theory is applied to obtain an approximate solution for suboptimal control of nuclear reactors with spatially distributed parameters. The inverse of the neutron velocity is regarded as a small perturbing parameter, and the model, adopted for simplicity, is a cylindrically symmetrical reactor whose dynamics are described by the one group diffusion equation with one delayed neutron group. The Helmholtz mode expansion is used for the application of the optimal theory for lumped parameter systems to the spatially distributed parameter systems. An asymptotic expansion of the feedback gain matrix is obtained with construction of the boundary layer correction up to the first order.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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• pp.925-928
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• 2000

In this paper, physical properties of cement mortar for floor using expansion agent are discussed varied with mixing time and curing temperature, delivery time and content of added water for preventing fluidity loss. According to experimental results, slump loss shows high with elapse of time And as curing temperature goes up, it also show high when curing temperature goes up and time lag between mixing and casting increases. As curing temperature goes down, drying shrinkage shows to be decreased. But it shows decline tendency with increase of added water content.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제6권10호
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• pp.51-58
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• 2000

This paper is the hospital planning and design considerations for the hospital expansion, renovation and new construction by the development of medical science during the last ten years, considering the operation policies, architectural provisions and economic conditions of operating department, by the interviews and questionaires for sanitary and medical personnels in hospitals. This study suggest new operation method and its planning guidelines.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제25권3호
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• pp.132-148
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• 2021

The modified F-expansion method is used to construct analytical solutions of the foam drainage equation with time- and space-fractional derivatives. The conformable derivatives are considered as spacial and temporal ones. As a result, some analytical exact solutions including kink, bright-dark soliton, periodic and rational solutions are obtained.

• 한국건축시공학회지
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• 제22권3호
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• pp.305-316
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• 2022

국내 건설기업은 해외건설 경기 체감지수를 통한 해외건설 전망자료가 없어 해외진출 전략 수립에 어려움이 있다. 또한, 최근 10년간 해외건설수주의 변동 폭은 매우 크고, 대기업과 중소기업이 적극적으로 해외진출을 하고 있기 때문에, 이에 본 연구에서는 해외건설기업의 경기체감을 파악할 수 있는 해외건설경기 체감지수 평가모델을 개발하였다. 해외건설은 2021년에 코로나-19, 저유가 등 여러 어려움 속에서도 지역 다변화 등 건설업체의 진출전략 강화 노력과 정부의 수주지원 등으로 전년대비 87% 수준인 306억 달러를 달성하였다. 이러한 해외건설의 경기는 국제 환경변화에 변동 폭이 매우 크기 때문에 해외건설기업의 경기 체감지수를 조사 및 분석하여 제공할 필요가 있다. 특히 중소규모의 건설업체와 엔지니어링업체의 해외진출이 증가함에도 불구하고, 해외건설경기 체감지수에 대한 정보제공이 미흡하여, 해외건설 진출전략을 수립하는데 한계가 있다. 따라서 본 연구는 해외건설기업의 경기체감을 파악할 수 있는 해외건설경기 체감지수 모델을 개발하고, 해외건설 전망을 제공하여, 해외건설 전략 및 정책수립에 활용하고자 한다.