• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.269-272
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• 2006

Chloride ion diffusion is the most important thing of occuring deterioration in RC structure. So it is important to decide the precise chloride ion diffusion coefficient in order to predict the durability life in RC structure. The purpose of this study is to analyze the established data, which are restricted by chloride diffusion coefficient, and to calculate chloride ion diffusion coefficient using RCPT test. To examine the prediction of the concrete structure durability by an FEM analysis and the chloride diffusion coefficient as a variable. Each surface finishing materials were effective on the increment of chloride penetration resistance, but showed a little different effect depending on the type of surface finishing material.

• 한국지열·수열에너지학회논문집
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• 제15권4호
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• pp.24-31
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• 2019

In this paper, we simulated a new apartment building by using radon emission test values from various building materials used as interior finishing materials. The simulations evaluated the radon concentration in the room according to the radon emissions and the ventilations for each type of finishing material (gypsum board, stone, tile and concrete). Overall concrete finish simulation case showed the highest concentration than the case using other materials due to the effect of wall area at the center of each room and the mean radon concentration at 1.5 m above the floor was slightly lower than the mean value at each center. In the case of the porch, pantry and bathroom, the radon concentration was high even when the same materials were used as in the other rooms.

• 한국염색가공학회지
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• 제27권3호
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• pp.210-218
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• 2015

In this study, natural substance and mineral materials was used for architectural interior wallpaper. Because natural substance and minerals are environment-friendly material with moisture adsorption and desorption properties. Natural substance and mineral materials was evaluated in moisture adsorption and desorption properties. Also, in the diatomite, the pores were observed on SEM photographs. Thus, it is supposed that moisture adsorption and desorption properties were influenced by the microstructure of the pore. The wallpaper according to the ratio of the mixture was analyzed for physical properties and moisture adsorption & desorption properties. As a result, we developed a wallpaper having excellent hygrothermal performance.

• 한국기계가공학회지
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• 제12권2호
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• pp.100-106
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• 2013

Stainless steel has some excellent properties as the material for the mechanical component. Purpose of this study is carried out to obtain mirror surface on the surperfinishing of stainless steel with high efficiency. To achieve this, we have conducted a series of polishing experiment for stainless steel using abrasive film from the perspective of oscillation speed, the rotational speed of workpiece, contact roller hardness, contact pressure and feed rate. Abrasive film used this study is a micro-finishing film and a lapping film. Furthermore, the polishing characteristics and efficiency of stainless steel is discussed through measuring optimal polishing time and surface roughness. From the obtained results, it was confirmed that efficient superfinishing conditions and polishing characteristic of Stainless steel can be determined.

• 한국구조물진단유지관리공학회 논문집
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• 제22권1호
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• pp.183-189
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• 2018

본 연구에서는 용사기법에 의해 콘크리트 표면에 금속피막을 형성하는 새로운 마감 의장기법의 가능성을 검토하기 위하여, 콘크리트의 함수율 변화에 따른 금속피막의 부착성능에 대하여 실험적인 연구를 수행하였다. 그 결과, 선재의 색은 용사 후에도 변하지 않는 것을 알 있었고, 콘크리트 부착강도 기준인 2.5 MPa를 확보하기 위한 하지 콘크리트의 함수율을 10% 이하로 관리하면 금속피막의 부착강도눈 확보되는 것으로 판단된다. 또한, 콘크리트와 금속피막의 부착강도를 증진시키기 위해서는 표면강화제에 의한 콘크리트 표면강화와 함께 금속피막을 봉공처리제로 봉공하는 것이 매우 유효한 것을 알 수 있었다.

• 복식문화연구
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• 제16권3호
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• pp.461-474
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• 2008

The purpose of this study was to present a making method of jeans pattern with high fitness after deriving the appropriate shrinkage rate by material and washing process. Research Method of jeans pattern was presented after applying the optimized shrinkage rate. According to the result of the exterior evaluation of test jeans, all 6 jeans were rated high with scores close to 3.5. Following the evaluation of satisfaction of usage by physical movement, the highest ranking was in the order of walking with normal steps, back bending $90^{\circ}$, chair sitting, climbing stairs, and squatting. The shrinkage rate by physical area showed the highest score in the order of pants length, waist circumference, thigh circumference, knee circumference, hem circumference, hips circumference. In addition, the shrinkage rate was higher in warp direction than weft direction after washing finishing. As for the result of addition and reduction of pattern measurements by parts of jeans, waist circumference was $2.5{\sim}5.2cm$, hips circumference was $-1.8{\sim}2.8cm$, thigh circumference was $-1.3{\sim}2.0cm$ and knee circumference was $-1.0{\sim}1.7cm$. Also, hem circumference was $-1.0{\sim}1.8cm$ and pants length was $2.9{\sim}6.2cm$. That is, this results showed a wide range of addition and reduction according to material and washing finishing.

• 콘크리트학회논문집
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• 제13권3호
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• pp.277-284
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• 2001

경화콘크리트는 골재와 시멘트 수화물에 의한 매트릭스 구조로 되어진 다공체이기 때문에 내부에 다양한 크기와 형태의 공극을 갖으며, 공기투과성을 갖게 된다. 이러한 투기성능은 탄산가스의 침투.확산에 따른 중성화속도와 산소와 물의 침투에 따른 철근의 부식속도를 결정하게 되어 철근콘크리트 구조물의 내구성과 밀접한 관련이 있는 것으로 보고되고 있다. 한편, 중성화속도 및 투기성능은 표면 마감재 및 콘크리트의 함수율에 의해 크게 영향을 받게 된다. 이에 본 연구는 물-시멘트비 및 마감재의 종류, 양생조건이 콘크리트의 중성화속도 및 투기성에 미치는 영향을 검토하고, 양생조건에 따른 함수상태가 투기성에 미치는 영향을 검토하였다. 본 실험결과 중성화속도 및 투기성은 물-시멘트비, 마감재의 유무 및 종류, 양생조건에 의해 크게 영향을 받으며, 콘크리트의 투기계수는 중성화속도계수와 밀접한 관련이 있는 것으로 나타나, 향후 중성화속도를 평가함에 있어서 투기계수를 요인으로 추정 가능할 것으로 사료된다.

• Journal of the Korean Wood Science and Technology
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• 제35권6호
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• pp.100-107
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• 2007

현대인들은 실내에서 보내는 시간이 하루 중 90% 달하는 것을 간주할 때 실내의 공기는 현대에게 중요한 요소임을 알 수 있다. 1960년대 이후로 산업이 급격히 발전하면서 건축 재료는 천연재료에서 화학물질을 기본으로 하는 재료로 변하게 되고 에너지 절약의 대책으로 건물의 기밀도를 높임으로써 건축자재에서 발생하는 유해물질이 현대인에게 악영향을 미치기 시작했고 이런 요소들이 근원이 되어 새집증후군을 유발하게 되었다. 생활수준이 높아지면서 사람들은 건강에 대한 관심도 높아지게 되고 보다 유익한 친환경 건축자재를 요구하게 되었다. 본 연구에서는 황토, 물, 수지, 경화제, 무기물 충전제를 이용한 친환경 황토 마감재를 개발하였고 한국형 목조 주택 내장벽에 사용할 수 있는 최적의 비율을 연구하였다. 그리고 이런 황토 마감재가 실내벽에 사용 시 요구물성인 내잔갈림성, 내세척성, 내충격성, 부착강도를 측정하였고 황토마감재의 특성인 원적외선 실험과 포름알데히드, TVOC 방산 농도를 통하여 친환경성에 대한 평가를 하였다.

• 한국염색가공학회지
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• 제31권4호
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• pp.341-353
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• 2019

Quercetin is one of flavonoids widely distributed in the plants and well known to have antioxidants, antiinflammatory, antimicrobial properties. In this study, alginate sponge containing quercetin-encapsulated nanocapsules was prepared by miniemulsion polymerization, dyring/crosslinking method and their bioactive characteristics were investigated. Alginate sponge containing quercetin-encapsulated nanocapsules were evaluated using a field emission scanning electron microscope(FE-SEM), a high performance liquid chromatography, cell viability, DPPH radical scavenging activity and antibacterial activity. The study indicates that alginate sponge containing quercetin-encapsulated nanocapsules had significant antioxidant, antiinflammatory and antibacterial activities. This study suggested that alginate sponge containing quercetin-encapsulated nanocapsules can be a potential candidate for medical materials.

• 한국염색가공학회지
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• 제31권4호
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• pp.354-362
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• 2019

In order to apply thermoplastic composites using PETG resin to various industrial fields such as bicycle frames and industrial parts, it is necessary to verify the impact resistance, durability and mechanical properties of the manufactured composite materials. To improve the mechanical properties, durability and impact resistance of PETG resin, an amorphous resin, in this study, compound and injection molding process were carried out using various additives such as TiO2, carbon black, polyolefin elastomer, and PETG amorphous resin. The thermal and mechanical properties of the thermoplastic composites, and the Charpy impact strength. The analysis was performed to evaluate the characteristics according to the types of additives. DSC and DMA analyzes were performed for thermal properties, and tensile strength, flexural strength, and tensile strength change rate were measured using a universal testing machine to evaluate mechanical properties. Charpy impact strength test was conducted to analyze the impact characteristics, and the fracture section was analyzed after the impact strength test. In the case of POE material-added thermoplastic composites, thermal and mechanical properties tend to decrease, but workability and impact resistance tend to be superior to those of PETG materials.