• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 추계 학술논문 발표대회
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• pp.113-116
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• 2008

In these days, properties of concrete has been demanded to be high performance because concrete structure was bigger and higher. So studies on high strength concrete and lightweight concrete has been frequently done. But lightweight concrete has been used to limited non-structural elements in th country. Lightweight aggregate mixed with lightweight concrete was only coarse aggregate in case of the structural lightweight concrete. In the country studies on the lightweight concrete was poor and unvaried. Also it is difficult to be practical use of lightweight concrete was that it has been expensive. It was study on the using fine lightweight aggregate with lightweight concrete to crushed by-products and wastes to get to make foamed glass with recycled glass. So it was tested by fine aggregate standard and mixed with.

• 대한지리학회지
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• 제38권5호
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• pp.741-753
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• 2003

본 연구는 고급화$.$대형화 경향을 보이면서 인근지역에 집적하고 있는 서울시 주상복합건물을 대상으로 '새로운 유형의 주택'에 의해 형성되고 있는 새로운 '주거지역'이라는 관점에서 이들의 주거특성을 살펴보고자 하였다. 주상복합건물 집적지역의 주거특성이 분화된 주거지역적 성격을 나타내고 있는지, 그리고 이들 지역은 도시공간구조적 계층성과 관련하여 볼 때 지역별로 차별적 성격을 보이는지를 분석하여 주거지역 이해에 있어 주택 및 지역성과의 관련성을 파악하고자 하였다. 연구 결과 주상복합건물 거주민들은 소득, 학력, 직업 등 사회ㆍ경제적 특성에 있어 주변 주거지역과 차별적 성향을 나타내고 있으며. 이러한 내부적 동질성이 주상복합 주거지역 간에는 입지에 따라 차별성이 존재함을 알 수 있었다. 이것은 주택의 선택에 있어 사회, 계층적 요소는 중요한 설명요인이지만, 주거지 선택에 있어 주변 지역의 성격은 중요한 요소임을 짐작하게 하는 부분이다. 결국 특정 유형의 주택이지만 어느 지역에 입지하느냐에 따라 주거 입지의 선택과정은 달라질 수 있고, 그 결과 주거지의 성격이 달라진다는 결론을 내릴 수 있다.

• ETRI Journal
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• 제30권4호
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• pp.546-554
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• 2008

Phase-locked loops (PLLs) are among the most important mixed-signal building blocks of modern communication and control circuits, where they are used for frequency and phase synchronization, modulation, and demodulation as well as frequency synthesis. The growing popularity of PLLs has increased the need to test these devices during prototyping and production. The problem of distinguishing and classifying the responses of analog integrated circuits containing catastrophic faults has aroused recent interest. This is because most analog and mixed signal circuits are tested by their functionality, which is both time consuming and expensive. The problem is made more difficult when parametric variations are taken into account. Hence, statistical methods and techniques can be employed to automate fault classification. As a possible solution, we use the back propagation neural network (BPNN) to classify the faults in the designed charge-pump PLL. In order to classify the faults, the BPNN was trained with various training algorithms and their performance for the test structure was analyzed. The proposed method of fault classification gave fault coverage of 99.58%.

• 한국경제지리학회지
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• 제16권1호
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• pp.71-85
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• 2013

본 연구는 개별 상업용 건물들을 중심으로 주변지역에 위치한 상업용 건물들과 주거지 개발패턴이 해당 건물가격에 미치는 영향을 고찰함으로써 물리적 도시공간구조가 부동산시장, 특히 상업용 부동산시장에 미치는 영향을 분석하고자 한다. 이를 위해 GIS 소프트웨어를 이용하여 용도간 근접성을 체크하였다. 연구 결과, 용도혼합이 오프스 건물가격에 긍정적인 영향을 미치는 것으로 나타나, 뉴 어버니즘에서 강조하는 복합용도개발을 통해 지속가능한 커뮤니티를 만들 수 있다는 가능성을 확인하였다. GIS기술을 이용하여 기존 연구들이 경제사회변수와 같은 대리변수를 사용했던 한계를 극복하고, 공간구조를 보다 정밀하게 측정할 수 있었다. 또한 토지이용에 따른 2차원분석이 아니라, 각 건물의 높이를 계산하여 3차원 분석을 함으로써 공간의 이용과 함께 밀도까지 고려한 방법론을 사용한 의의가 있다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
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• pp.192-193
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• 2013

In recent years, risks associated with mixed used development in urban regeneration projects which have actively been implemented have been on the rise due to uncertainties and complexities of those projects. Thus, risk management is needed to effectively manage those risks that may occur during the process of a project. Many studies have contributed to deal with risk management of those projects. These studies, however, have focused main on identification stage and deriving the main risk factors and have limitations on presenting the relationship among those risk factors. Since many risks are interdependent and have multiple effects, the purpose of this study is to present a way(ISM method) to provide a hierarchical structural framework of risks in Urban Regeneration. The structural of risks can helps decision makers to trace the actual source of these risks.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.21-22
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• 2013

Nowadays, the fiber which mixed with concrete matrix always has low adhesion with cement paste. It's difficult to use fiber to reinforce the structure. For more adding fiber in concrete would cause some problems as the low flowability and surface polishing. Further study is needed in fiber using. In this research, further study in fiber reinforced concrete has been invested. Various fibers with different properties have been used to prevent cracking. Fiber reinforced concrete's fundamental properties as slump, air content, compressive strength and tensile strength have been tested. Optimum type of the fiber and optimum addition ratio of fiber has been invested to increase the utility of the fiber which used in concrete.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.147-148
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• 2023

Recently, as blast furnace slag concrete has become widely used, managing the strength of concrete has become important. mSn is a method of correcting the difference in strength between standard cured specimens and concrete exposed to changes in temperature. In this study, the predicted strength based on the maturity of the central and outer parts of the blast furnace slag concrete structure is compared with the actual strength measured through coring. As a result, the actual strength difference between the center and the outer part of the concrete mixed with blast furnace slag was larger than the predicted strength difference.

• 한국강구조학회 논문집
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• 제27권3호
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• pp.299-310
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• 2015

일반적인 CFT구조는 구조적 거동이 우수함에도 불구하고 폐단면으로 인한 제작 및 가공의 번거러움, 충전성 등의 문제를 가지고 있다. 이 연구는 CFT구조의 충전성을 개선한(보의 상플랜지에는 관통다이아프램, 하플랜지에는 외측다이아프램을 적용) 기둥-단순보의 접합부에서 외측 다이아프램의 치수에 따른 구조적 거동을 살펴보았다. 변수해석을 실시하여 EP-T 타입 접합부내력 영향을 주는 이유를 찾았다. 결과적으로 원형CFT기둥-보접합부에 대한 실험 및 해석을 통하여 원형 CFT구조의 구조적 거동을 조사했다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 추계 학술논문 발표대회 논문집
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• pp.75-79
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• 2006

Recently, more highly effective construction materials are needed for the reasonable and economical structure system is required as the construction structures become more multi storied, large-sized and diversified. That is to say, the highly qualified concrete is positively promoted as a part of plan to establish the effective space according to the dead load of structures and diminish of segment profile and to build up the economic structures. However, the high strength concrete has the problems such high brittleness and low ductility. Specially, for the high strength concrete, it has different strength from normal concrete as the internal temperature goes up steadily due to high heat of hydration by the quantities of highly level of cement, so the concrete which is mixed with various miscible materials is used. As the development and study for high strength concrete (more than $100N/mm^2$) is under way actively and the strength of high strength concrete increases, the strength different from the existing high strength concrete of ten than $100N/mm^2$, but the study for this is not adequate and indefinite. In addition, the study and report to apply the strength expression and analysis results of internal structure. Therefore, this study is an experiment about using the miscible materials affects what happens to the longitudinal physical property.

• 한국지진공학회논문집
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• 제23권1호
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• pp.43-54
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• 2019

Existing reinforced concrete frame buildings designed for only gravity loads have been seismically vulnerable due to their inadequate column detailing. The seismic vulnerabilities can be mitigated by the application of a column retrofit technique, which combines high-strength near surface mounted bars with a fiber reinforced polymer wrapping system. This study presents the full-scale shaker testing of a non-ductile frame structure retrofitted using the combined retrofit system. The full-scale dynamic testing was performed to measure realistic dynamic responses and to investigate the effectiveness of the retrofit system through the comparison of the measured responses between as-built and retrofitted test frames. Experimental results demonstrated that the retrofit system reduced the dynamic responses without any significant damage on the columns because it improved flexural, shear and lap-splice resisting capacities. In addition, the retrofit system contributed to changing a damage mechanism from a soft-story mechanism (column-sidesway mechanism) to a mixed-damage mechanism, which was commonly found in reinforced concrete buildings with strong-column weak-beam system.