• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1998년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Spring 1998
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• pp.136-143
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• 1998

Elastomeric bearing is used as one of the most useful way for isolation structures, because the horizontal stiffness is much lower than the vertical stiffness. The quality of Elastomeric bearing depends on the vulcanization procedure to manufacture, which produces the elasticity of the rubber from the compound of rubber and sulphur. The durability of Elastomeric bearing is affected by the deterioration due to ozone and ultra-violet attack. but the durability during the design life of bridges can be assured by the sufficient size of the bearing in spite of the deterioration in surface. In the design criteria of Elastomeric bearing, the stability of the bearings is evaluated by shear strain due to compression, lateral displacement, and rotation. The question how soft rubber can sustain heavy structure is now able to be solved by Ultimate capacity test of Laminated elastomeric Bearings, which results 1,200kg/$\textrm{cm}^2$ of the max. compressive stress and this shows what a sufficient safety factor Elastomeric bearing has!

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.221-224
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• 2004

Several factors of concrete durability decline factor are acted as complex deterioration and is happened not that happen by simplicity deterioration. Specially, in case of sea construction, as complex salt damage, carbonation and freezing & thawing, concrete surface and pore structure is deteriorated. Therefore, analyzing concrete carbonation and pore structure after freezing and thawing test by fresh water and sea water in this research, we wish to study about acceleration of decline of durability and complex deterioration by concrete surface deterioration in sea environment.

• 한국자동차공학회논문집
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• 제11권4호
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• pp.151-157
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• 2003

In this paper, a blackbox approach is carried out to model the nonlinear dynamic bushing model. One-axis durability test is performed to describe the mechanical behavior of typical vehicle elastomeric components. The results of the tests are used to develop an empirical bushing model with an artificial neural network. The back propagation algorithm is used to obtain the weighting factor of the neural network. Since the output for a dynamic system depends on the histories of inputs and outputs, Narendra algorithm of 'NARMAX' form is employed to consider these effects. A numerical example is carried out to verify the developed bushing model.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.60-61
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• 2019

Concrete carbonation is one of the factors that reduce the durability of concrete. In modern times, due to industrialization, the carbon dioxide concentration in the atmosphere is increasing, and the impact of carbonation is increasing. So, it is important to understand the carbonation resistance according to the concrete compounding to secure the concrete durability life. In this study, we want to predict the concrete carbonation velocity coefficient, which is an indicator of the carbonation resistance of concrete, through the deep learning algorithm, and to find the activation function suitable for the prediction of carbonation rate coefficient as a process to determine the learning accuracy through the deep learning algorithm. In the scope of this study, using the ReLU function showed better accuracy than using other activation functions.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.61-62
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• 2022

The unit quantity is an important factor influencing the durability, workability, and quality of concrete. Methods for measuring the unit quantity include a high frequency heating method, a unit volume mass method, a capacitance method, and a microwave method. However, these methods have disadvantages of poor measurement method, time required, and accuracy, and a relatively experimental method compensating for these disadvantages was used to measure the unit quantity using a high frequency main sensor (FDR) capable of simple and fast measurement. In addition, the unit quantity was evaluated by analyzing the measurement data through deep learning.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.70-71
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• 2021

The unit quantity that affects the workability, shrinkage cracking, and durability of concrete is an important factor. Methods for measuring the unit quantity include a high frequency heating method, a capacitance method, a unit volume mass method, and a simple method. However, these methods have the disadvantage of poor measurement method, time required, and precision. To solve this problem, a relatively simple and fast measurement method was adopted to compensate for the shortcomings through a Frequency Domain Reflection (FDR) sensor, and the unit quantity was used. In addition, the measurement data was analyzed by deep learning to evaluate the unit quantity of concrete.

• 콘크리트학회논문집
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• 제13권1호
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• pp.23-29
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• 2001

최근 도심지의 재건축 및 노후된 콘크리트 구조물의 재건축으로 인해 발생하는 막대한 양의 폐콘크리트를 단술 폐기하거나 매립하는 것은 환경의 오염을 초래할 뿐만 아니라, 천연자원의 고갈이 우려되는 현실에서 자원의 낭비이다. 따라서, 본 연구에서는 폐콘크리트를 콘크리트용 골재로 사용하기 위한 기초자료로서 재생골재를 사용한 콘크리트의 내구성을 검토하였다. 실험을 통하여 압축강도 실험에 의한 강도특성, 동결융해 실험에 의한 내구성지수 및 건조수축에 의한 콘크리트의 길이 변화를 고찰하였다. 연구결과, 콘크리트용 골재로서 재생골재를 일반 쇄석골재에 대하여 30%정도 대체하여 사용해도 콘크리트의 역학적 특성 및 내구성측면에서 양호한 재생골재콘크리트를 얻을 수 있음을 알 수 있었다. 또한, 재상골재콘크리트에 20%정도의 플라이 애쉬를 혼입하면 콘크리트의 품질을 향상시킬 수 있음을 알 수 있었다.

• 한국염색가공학회지
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• 제27권2호
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• pp.119-125
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• 2015

The effects of e-beam irradiation on water-repellency and washing durability of water-repellent finished chemically-recycled PET(CR-PET) fabrics were investigated. As results, more doses of e-beam irradiation damaged the fabric surface more severely. It was thought because the high densed energy was formed, where the more e-beam was converged. The contact angle measurement showed that as the dose of e-beam irradiation increased, water wettability of the CR-PET fabric increased slightly. It was thought to be due that the surface etching by e-beam irradiation let water droplet permeate into the fabric surface better. The concentration of the water-repellent finishing agent was more important factor than curing temperature as finishing parameter. It was considered because the water-repellent finishing agent used in this study got to cure sufficiently at low temperature. Consequently, e-beam irradiation improved the washing durability of water-repellent finishing on the CR-PET fabrics.

• 콘크리트학회논문집
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• 제26권5호
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• pp.607-614
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• 2014

본 논문에서는 품질확보를 위하여 혼합골재 입도분포를 적용한 부순모래 숏크리트에 플라이애시, 고로슬래그 미분말, 메타카올린, 실리카퓸을 종류 및 혼입률에 변동을 주어 혼입하여 숏크리트의 기초특성과 내구특성에 미치는 영향을 고찰하였다. 또한 각 혼화재료의 주요 혼입률을 선정하고 실제 숏팅을 실시 하여 숏팅 전 후의 기초특성과 내구특성을 분석하였다. 실내실험 결과 광물성 혼화재료 혼입률이 증가할수록 압축강도가 증가하는 경향을 보였다. 특히 메타카올린을 혼입한 경우 가장 우수한 강도 증진효과를 보였으며, 숏팅 후 압축강도 역시 코어링에 의한 강도감소 현상을 감안하여도 강도 발현이 우수한 혼화재료로 판단된다. 염소이온 침투저항성 시험과 황산저항성 시험 결과 광물성 혼화재료 혼입은 염소이온과 황산에 대한 저항성이 증진되는 경향을 보인다. 화상분석을 통한 공극구조 분석 결과 공기연행제를 사용하지 않아 소요의 간격계수와 비표면적을 얻는데 실패하였으며, 향후 공기연행제의 도입 후 실험이 진행될 필요성을 보이고 있다.

• 한국건축시공학회지
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• 제8권6호
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• pp.147-154
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• 2008

In today, there has been an increase in the construction of agricultural facilities due to the development in agricultural technology. Agricultural facilities are becoming bigger and higher to plant various agriculture. This study analyzes the construction and maintenance problems in agricultural facilities. The results of this survey on the status of agricultural facilities are presented. Firstly, the construction cost is most important factor in agricultural facilities. Secondly, Materials durability is important factor in selecting the facilities. Third, safety in facilities is also important factor. The results of this research are greenhouse is lack of the law of contract and the performance and need for the construction process supervision.