• 한국재난정보학회 논문집
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• 제12권3호
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• pp.292-299
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• 2016

건축물에서 단열재는 매우 중요하다. 건축물에 사용하는 단열재는 재료에 따라 유기단열재와 무기단열재로 크게 나누는데 스티로폼이나 우레탄으로 만들어진 유기단열재는 화재에 매우 취약하다. 반면 펄라이트 무기단열재는 불연재이나 습기에 매우 취약하여 사용범위가 제한적이다. 본 연구에서는 단열성능이 보드의 두께가 50mm 이내의 샘플에서 열전도율과 흡수율은 각각 0.05W/mk, 3.0% 이하, 휨강도와 발수율은 각각 $25N/cm^2$, 98% 이상인 무기단열재를 개발하고 열전도 특성을 평가하였다.

• 한국생활과학회지
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• 제18권1호
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• pp.145-155
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• 2009

The purpose of this study is to examine the university students' awareness and attitudes on functional clothing materials, and to explore the effects of subjects' characteristics on the relationship between their attitudes to and images of the functional clothing materials. A total of 500 questionnaires were distributed to university students and 409 of which were used in data analysis. The data were statistically analyzed by frequency, factor analysis, reliability analysis, correlation analysis, t-test, ANOVA. The results were as follows: students thought that the first and foremost 'function' of functional clothing materials is their light-weight. The functions that consumers practically demanded are water-repellency and high absorbency & quick drying. It showed that students have an image that functional clothing materials have special, good and satisfactory qualities. Goretex and Coolmax were the most selected as brands of functional clothing materials which students knew. Attitudes to functional clothing materials revealed positively in the cognitive, behavioral and affectional attitudes. The attitudes had no significant differences according to sex and their major, but they had significant differences by subjects' amount of allowance, frequency of sports participation and sports ability. In other words, the more amount of allowance they get, the more frequently students do exercise, and the higher sports ability they have, the more positive attitude they have. The study says, in conclusion, that their conception of functional clothing materials has positive relations with their attitudes toward them.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2012년도 제46차 학술발표회
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• pp.60-60
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• 2012

최근 들어서 소비성향의 고급화 추세와 고기능성 및 쾌적성의 추구는 발수성의 개발로 이어져왔다. Polyester, Nylon 등 다양한 합성섬유소재의 발전으로 발수기능이 상품가치의 중요한 요소로 자리잡고 있다. 더 나아가 표면과 이면이 서로 다른 특성을 가지도록 유도하여 편면기능성을 부여하는 가공을 응용한다면 더욱 더 고부가가치를 기대할 수 있다. 본 연구에서는 불소계로 발수 처리된 Polyester직물 및 Nylon/PU 혼방직물에 저온 플라즈마를 출력 50W, 1, 3, 5, 7 분 처리하여 편발수성을 검토하였다. 불소계 발수제로 코팅처리한 Polyester직물의 경우 5분간 Plasma처리하면 접촉각이 미처리 시료의 $149^{\circ}$에서 처리 후, 앞면 $71.56^{\circ}$, 뒷면 $126.94^{\circ}$,Nylon/PU 혼방직물의 경우에는 $155.3^{\circ}$에서 앞면 $63.24^{\circ}$, 뒷면 $139.26^{\circ}$로 크게 편면 친수화 되었다. 그 결과로 볼 때 플라즈마처리에 의해 편면발수 가공으로 서의 효과를 얻을 수 있었다. SEM 관찰을 통해 Polyester직물 및 Nylon/PU혼방 직물에 플라즈마 처리한 후 처리시간에 따른 펴면의 발수가공 층이 파괴되는 것을 알 수 있었다. 이는 표면에서의 발수효과가 플라즈마처리에 의해 친수화가 진행된 결과와 일치한다.

• 한국응용과학기술학회지
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• 제32권3호
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• pp.546-567
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• 2015

실리콘계 계면활성제는 소수성 유기실리콘 그룹에 하나 또는 그이상의 친수성 극성그룹이 결합되어 있다. 반면에 탄화수소 계면활성제의 소수성 그룹은 탄화수소이다, 실리콘 계면활성제는 낮은 계면장력, 윤활성, 퍼짐성, 발수성, 열 안정성, 화학적 안정성 때문에 폴리우레탄 폼을 시작으로 건설재료, 화장품, 페인트잉크, 농약 등 많은 산업분야에 사용되고 있다. 다양한 응용분야에서의 요구사항을 반영하기 위한 다양한 기능을 가진 폭 넓은 화학구조를 가진 실리콘 계면활성제들이 필요하다. 본 총설에서는 소수성 폴리실록산 중추로서의 폴리디메틸실록산과 반응성 폴리실록산의 성질과 합성방법, 반응성 폴리실록산을 친수성 그룹과 결합시키는 규소수소화반응 같은 주요 반응방법, 그리고 폴리에테르, 이온성, 카보하드레이트 타입 같은 주요 고분자 실록산 계면활성제들의 합성방법을 논의한다.

• 한국의류산업학회지
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• 제12권2호
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• pp.224-232
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• 2010

The natural dyeing of fabrics with persimmon juice(astringent persimmon, sweet persimmon, astringent and sweet persimmon mix) was investigated. After dyeing of cotton and silk fabrics with persimmon juice, we evaluated the dyeability of persimmon juice, the observation of fabric surface with high magnification video microscope, physical properties and color fastness with the conditions of repeating times of dyeing and variables of mordants. The results obtained from this study were as follows: The fabrics dyed with astringent persimmon have shown the highest color difference, while the fabrics dyed with sweet persimmon and the fabrics dyed with astringent and sweet persimmon mix have shown similar color differences. With the increase of repeating times of dyeing, the brightness of fabric decreased. However, $a^*$ value increased gradually, so that it became dark brown color. The $a^*$ and $b^*$ values of dyed fabrics with Fe-mordant have dropped significantly, so that they have shown achromatic colors. But the fabrics treated with other mordants have shown yellowish brown colors. On the surface of the fabrics, threads were bonded together by the viscosity of persimmon juice. Regardless of the types of persimmon juice, stiffness was increased after dying, while crease resistance was decreased. The water repellency of silk fabrics were improved than cotton fabrics after dyeing with sweet persimmon juice, but in case of cotton, it hasn't changed. Washing fastness was improved with the EM(Effective Microorganism)-fermented liquid treatment, and rubbing fastness of two fabrics was better in dry condition than in wet condition.

• 마이크로전자및패키징학회지
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• 제23권4호
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• pp.107-112
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• 2016

본 논문에서는 나노임프린트 리소그래피 기술을 이용하여 다양한 발수 표면을 제작하였으며, 발수기능의 안정성을 향상시키기 위해 액적의 충돌 거동에 대하여 평탄한 단위면적에 대한 구조물의 면적비인 표면 변수의 영향에 대한 연구를 수행하였다. 액적의 충돌 거동을 연구하기 위해 액적 충돌 시험을 통하여 충돌한 액적이 되튐에서 분산으로 천이 되는 임계높이를 측정하였다. 높은 표면 변수에서는 낮은 임계높이가 관찰되었으나, 낮은 표면변수에서는 임계높이가 증가하는 경향을 관찰하였다. 그러나, 표면변수가 더욱 감소할 경우 임계높이가 다시 감소하는 경향을 보였다. 관찰된 결과는 높은 임계높이를 위해서는 최적의 표면 형상 설계가 요구됨을 제시하고 있다.

• 한국의류산업학회지
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• 제2권3호
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• pp.220-226
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• 2000

This study was to determine the characteristics of vapor-permeable waterproof finished fabric by the coating method. 4 different kinds of coating fabrics (A : wet, porous, polyurethane, B : dry, no porous, polyurethane, C : shape memory polyurethane and D : dry, porous polyurethane) were used, which were developed recently With this sample, moisture transport rate ($40^{\circ}C$, 45%RH & $40^{\circ}C$, 95%RH), changes of coating side's shape by washing times, water repellency rate, contracted length, qmax, heat conductivity, heat keeping rate, heat keeping rate with cotton, heat keeping rate on humidity temperature and humidity within clothing etc. were checked. And it was done in a climate chamber under $20{\pm}2^{\circ}C$, $65{\pm}5%RH$. The results of this study were as follow; In the moisture vapor transmission of sample B and C increased on high temperature and high humidity while sample A and D decreased, on this condition. Qmax rate had high relation with ground fabric's surface properties and the order was A>C>D>B. Heat conductivity had high relation with thickness and surface properties. Heat keeping rates on sweat condition showed around half percents of heat keeping rates on normal condition, but had no relation with moisture vapor transport rate. Changes of the fabric's properties by washing times were different in accordance with the construction of fabrics and the coating resin. Sample C had tow heat keeping rate on the high temperature and humidity and high heat keeping rate on the low temperature and humidity Moisture transport rate of vapor-permeable waterproof finished fabrics had high relation with the properties of ground fabrics on low humidity condition, but on the high humidity condition, it was highly related with the properties of coating resin.

• 한국의류산업학회지
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• 제17권2호
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• pp.247-257
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• 2015

This study conducted a questionnaire survey on the real condition of clothing with focus on related to general motorcycle wear and motorcycle jacket targeting a quick service carrier affiliated with a quick service business in Seoul. In addition, this study is aimed at providing basic data on developing the motorcycle jacket, whose motional flexibility, safety and functionality are excellent, exclusively for a quick service carrier by grasping inconveniences and problems and deducting improvements on the basis of the questionnaire survey. This study, on the basis of the questionnaire survey results, grasped the general part related to quick service and motorcycle wear, such as their general matters, whether they were having on the motorcycle wear in the middle of doing business, whether it's necessary to wear the motorcycle wear, where they had a driving accident, and kinds of external injuries, etc. From the gathered results of analysis of the collected questionnaires, the item which got the lowest satisfaction was the inconvenience from the chafed front neck when driving. Besides, the results showed carriers' complaints like the elbow part felt tight, discomfort in the horizontal movement of the shoulders or back, and wind admission in between zippers. In addition, the respondents showed complaints in the item about hygroscopic property and air permeability at the armpits and back part, and 5 items about material flexibility, wind shielding property, living water repellency, weighty sensation, and night visibility were found to be low in respondents' satisfaction.

• Geomechanics and Engineering
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• 제18권2호
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• pp.179-188
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• 2019

This paper presents an experimental study to evaluate the effect of palm oil on the selected basic physical-chemical and geotechnical properties of kaolin. The experimental findings are further compared with literature outcomes investigating similar properties of fine grained soils subjected to contamination by different types of oils. To this end, palm oil was mixed with oven dried kaolin samples-aiding oil's interaction (coating) with dry particles first, in anticipation to emphasize the effect of oil on the properties of kaolin, which would be difficult to achieve otherwise. Oil content was limited to 40% by dry weight of kaolin, supplemented at intervals of 10% from clean kaolin samples. Observations highlight physical particle-to-particle bonding resulting in the formation of pseudo-silt sized clusters due to palm oil's interaction as evinced in the particle size distribution and SEM micrographs. These clusters, aided by water repellency property of the oil coating the kaolin particles, was analyzed to show notable variations in kaolin's consistency-measured as liquid and plastic limits. Furthermore, results from compaction tests indicates contribution of oil's viscosity on the compaction behavior of kaolin - showing decrease in the maximum dry unit weight (${\gamma}_{d,max}$) and optimum moisture content ($w_{opt}$) values with increasing oil contents, while their decrease rates were directly and inversely proportional in ${\gamma}_{d,max}$ and $w_{opt}$ values with oil contents respectively. Comparative study in similar terms, also validates this lower and higher decrease rates in ${\gamma}_{d,max}$ and $w_{opt}$ values of the fine grained soils respectively, when subjected to contamination by oil with higher viscosity.

• 한국환경복원기술학회지
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• 제22권1호
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• pp.33-45
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• 2019

Compound disaster is the type that increases the impact affected by two or more hazard events, and attention to compound disaster and multi-hazards risk is growing due to potential damages which are difficult to predict. The objective of this study is to analyze the possible impacts of post-fire landslide scenario quantitatively by using TRIGRS (Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Analysis), a physics-based landslide model. In the case of wildfire, soil organic material and density are altered, and saturated hydraulic conductivity decrease because of soil exposed to high temperature. We have included the change of soil saturated hydraulic conductivity into the TRIGRS model through literature review. For a case study, we selected the area of $8km^2$ in Pyeongchang County. The landslide modeling process was calibrated before simulate the post-wildfire impact based on landslide inventory data to reduce uncertainty. As a result, the mean of the total factor of safety values in the case of landslide was 2.641 when rainfall duration is 1 hour with rainfall intensity of 100mm per day, while the mean value for the case of post-wildfire landslide was lower to 2.579, showing potential landslide occurrence areas appear more quickly in the compound disaster scenario. This study can be used to prevent potential losses caused by the compound disaster such as post-wildfire debris flow or landslides.