• 한국염색가공학회지
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• 제20권5호
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• pp.7-13
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• 2008

In order to introduce new functions onto textile fabrics, nylon and cotton were treated with green tea extracts. And then the anti-oxidant activity of fabrics treated with the extracts was evaluated by Blois method using DPPH ($\alpha$, $\alpha$-diphenyl- $\beta$-picrylhydrazyl). The anti-oxidant activity was exhibited on the textile fabrics treated as well as by the extracts itself. The cotton fabric treated with 10% o.w.f. of extract appeared to have almost 90% of anti-oxidant activity and 95% was obtained for nylon.

• 대한안전경영과학회지
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• 제12권1호
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• pp.1-9
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• 2010

Recently, in circumstantial situation it is recommended positively to utilize of EIFS(Exterior Insulating and Finishing System) as energy policy for economizing energy. But internal EPS insulators of EIFS are exterior panel of high fire risk, because of constituting of flammable materials to be fragile in fire. In this study, fire risk is assessed by experiment Con Calorimeter test and SBI(Single Burning Item) test. As the result of experiment, Con Calorimeter tests do not reach to capability standard of internal incombustible grade, and are assessed as low grade in SBI incombustible grade. Because EIPS is exterior material in buildings with high fire risk in spite of good efficiency, it is required rapidly to take measures to meet situation through various studies(for instance, adjusting law regulation, etc.) in the future.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.265-268
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• 2006

Many studies about carbonation experiments which result in deterioration of the Reinforced Concrete(from now on RC) structure have being done by now. But most of the studies are about RC itself without thinking of finishing materials. So in this study, we experimented to know restrain-effects which each finishing material has for carbonation. On the basis of experiments, we estimated velocity coefficient for carbonation. We want to show basis data about how much each surface-finish has a restrain-performance against carbonation.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.209-210
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• 2010

탄산화의 억제를 위해 사용되는 마감재에 대하여 $CO_2$ 투과계수 평가방법을 제시하고, 우레탄 및 아크릴의 $CO_2$ 투과계수를 비교 분석하고자 한다.

• International Journal of Precision Engineering and Manufacturing
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• 제5권2호
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• pp.32-38
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• 2004

The electrorheological(ER) fluid has been used to the ultraprecision polishing of single crystal silicon as new polishing slurry whose properties such as yield stress and particle structure changed with the application of an electric field. In this work, it is aimed to find the effective parameters in the ER fluid on material removal in the polishing system whose structure is similar to that of the simple hydrodynamic bearing. The generated pressure in the gap between a moving wall and a workpiece, as well as the electric field-induced stress of the mixture of ER fluid-abrasives, is evaluated experimentally, and their influence on the polishing of single crystal silicon is analyzed. Moreover, the behavior of abrasive and ER particles is described.

• 한국염색가공학회지
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• 제16권1호
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• pp.53-58
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• 2004

The preparation of responsive fibers from acrylic fibers is studied. Various responsive fibers, such as fibers which change their color on exposure to light or with change in temperature, have been developed and are used commercially However, the responsive material in these fibers are not the fiber itself but chemicals in microcapsules attached to the fibers by finishing, and few fibers exhibit responsive properties by itself. The partial hydrolysis of polyacrylonitrile fibers to obtain pH responsive fibers is presented in this paper. Partial hydrolysis was effected by control of the concentration of the sodium hydroxide used in the hydrolysis, hydrolysis temperature and time. The degree of hydrolysis was evaluated by nitrogen content of the hydrolyzed fibers and their response, change in length, to aqueous solutions of varying pH was studied by continually changing the pH. Significant changes in lengths with pH were observed and the gel transition behavior varied with the conditions of hydrolysis. The hysteresis of the length change was also studied to evaluate the possibilities of using hydrolyzed acrylic fibers as pH sensors.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 가을 학술발표회 논문집
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• pp.74-75
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• 2003

Recently, people are gradually concerned about environmental issue, bionics, environmental-friendly or biocompatible materials. Poly(vinyl alcohol) (PVA) is suitable for these materials, because it is typically water-soluble polymer that have linear-flexible chains, a material of no toxicity for human, and biodegradable polymer[1]. One of the most effective factors that dominate the properties of PVAs is tacticity. (omitted)

• 한국염색가공학회지
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• 제34권3호
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• pp.165-172
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• 2022

Polypropylene(PP) is a textile material with various functions such as eco-friendliness, lightness, and elasticity. Although most synthetic fibers can be dyed and finished, but original PP is difficult to dye or finish due to its extremely hydrophobic properties, so its application expansion is limited. In order to solve this problem, dyeable PP was developed, and various researches on textiles for clothing such as mass production technology, fine fiberization and performance improvement are in progress. Plasma treatment is a processing method for modifying the surface of fabrics, and has effects such as hydrophilization, deepening color, improving adhesion, and surface polymerization. In this study, plasma treatment was applied to study changes in hydrophilization properties of dyeable PP, surface changes before and after plasma treatment and performance according to hydrophilization.

• 한국정밀공학회지
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• 제14권12호
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• pp.30-47
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• 1997

This paper encompasses a general technology in robot deburring automation using solid rotaing burr tools. Deburring is a cumbersome area in finishing technology, where design concept and system implementation is based on knowhows and experiences rather then theoretical development. In the field engineering it is diffcult to find a clue to where and how to start the system design. This paper presents a guide inselection of tool concept of geometry and material. Also, the concept of tool compliance system is introduced, which is one of the most important factor in robot deburring. Typical problems encountered in the field are classified into 20 categories and the solutions are suggested by the proven technology from the expertise. Special problems in polymer and diecasting areas are also briefly mentioned.

• 한국건설순환자원학회논문집
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• 제6권4호
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• pp.95-102
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• 2012

고층건축물의 구조부재로 적용되는 철골이나 고강도콘크리트로 시공된 경우 내화대책은 필수 불가결한 요소이며 특히, 고강도콘크리트로 적용된 경우 폭렬 등에 의한 단면결손이 발생하기 쉽기 때문에 이에 대한 대책이 필요하다. 즉, 내화성능 확보를 위해 온도상승을 허용범위 이내로 억제하는 대책이 필요하며 이 중 가장 효율적인 방법이 내화성 마감을 실시하는 것이다. 일반적으로 내화성 마감재에 사용되는 시멘트계 재료는 C-S-H, 및 CH가 단계적으로 열 분해되어 압축강도는 저하하게 된다. 내화성능을 발휘하기 위해 고온에서 강도감소가 작고 안정적인 고온특성을 보인다면 보다 효과적으로 성능 발현이 가능할 것이다. 본 연구는 고층건축물의 철골 및 콘크리트 부재의 효과적인 내화성능 발현을 위한 경량 내화성 마감재 개발을 위한 연구로 내화성능이 우수하다고 알려진 Alumino-silicate계 재료를 내화성 마감에 적용하기 위해 고온특성에 대해 검토하였다. 검토 결과, 플라이애시, 메타카올린 및 경량골재를 활용한 경량 내화성 마감재는 고온에서 비교적 안정적인 특성을 발현하여 내화성 마감재로의 효용성을 확인할 수 있었다.