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면(棉)과 나일론 직물(織物)의 괴화(槐花) 염색(染色)에서 Chitosan 처리(處理)와 매염(媒染) 이 색상(色相)에 미치는 영향(影響)
황희연 ( Hui Youn Hwang ),최정임 ( Jeong Im Choi ),전동원 ( Dong Won Jeon ) 한국패션비즈니스학회 2006 패션 비즈니스 Vol.10 No.2
In this study, the effects of chitosan pre-treatment on the mordanting effect and dyeability were investigated in the dyeing using Japanese pagoda tree. The chitosan treatment effects were evaluated mainly focused on the colors after dyeing of cotton and nylon fabrics which were treated with acidic aqueous solution of chitosan. In the case of chitosan untreated fabrics, the mordanting effects on the cotton and nylon were insignificant and the dyeability was very low. Regardless of the mordant types(Al, Sn, and Fe), the dyed fabrics exhibited almost identical yellowish colors. In the case of chitosan treated fabrics, dark colors were obtained compared to the case of chitosan untreated and ΔE values were increased significantly. In cotton fabrics, the most excellent result was obtained under the condition of unmordanted and chitosan treated fabrics. This verifies the fact that routin coloring matters establish direct linkages with the chitosan components, which exhibit cationic nature, easily. In nylon fabrics, the effects of mordanting treatment and chitosan treatment are so insignificant that the routin coloring matters are presumed to establish direct dyeing with the nylon molecular chains.
황희석(Hwang, Hui-Seok),김동건(Kim, Dong-Geon),유남재(Yoo, Nam-Jae) 강원대학교 산업기술연구소 2014 産業技術硏究 Vol.34 No.1
In this paper the settlement characteristic of shallow foundation on sandy soil overlained by rigid ground was investigated by analyzing results of model tests. For model experiments, model tests were performed with sandy soils sampled from the field, changing the relative density of sandy soil and the ratio of thickness of sandy layer(H) to the width of model strip footing(B). As result of tests, settlement of sandy soils increases as the value of H/B increases, whereas it increases with relative density of soil. Bearing capacity decreases as the thickness of the sand layer relative to the footing width increases. In order to analyze the settlement characteristics of sandy ground, the results of model tests were compared with the predicted values using the empirical formulas proposed by Terzaghi, De Beer and Schmertmann. The method by De Beer was found to be in good agreements with test results.
삼축시험과 직접전단시험에 의한 불포화토의 전단특성 비교
황희석(Hui-Seok Hwang),최영남(Young-Nam Choi),박병수(Byung-Soo Park),유남재(Nam-Jae Yoo) 한국지반신소재학회 2016 한국지반신소재학회 논문집 Vol.15 No.4
본 논문은 삼축압축시험(CD)과 개선된 직접전단시험 결과 얻어진 불포화토의 전단특성을 비교분석하여 새로이 개선된 직접전단 시험장비의 실용성을 검증하였다. 2010년 경기도 양평군 토석류 발생사면에서 채취한 시료를 대상으로 불포화토 상태의 전단강도실험을 수행하였다. 다른 두 종류의 실험방법에서 낮은 모관흡수력이 작용하는 경우는 전단강도와 선형적인 관계를 나타내며, 모관흡수력의 증가함에 따라 불포화토의 겉보기 점착력 역시 선형적으로 증가하였다. 다른 두 실험장비에 의한 결과를 비교한 결과, 산정된 불포화토의 강도정수(c′, ø<SUP>b</SUP>) 는 전단 상자의 구속효과가 있는 개선된 직접전단시험에서 다소 크게 나타났다. In this paper, shear strength characteristics of an unsaturated soil were compared using triaxial compression tests(CD) and modified direct shear tests and thus feasibility of the newly modified direct shear testing apparatus was confirmed. The shear strength tests of unsaturated state with a soil sample, obtained from a slope where debris flow occurred at Yangpyeong in Kyeunggi province during 2010, were performed. Both tests showed a linear relationship of matric suction with the shear strength under low level of matric suction. The apparent cohesion of the unsaturated soil was also increased linearly with increase of matric suction. As results of comparing two different testing apparatus, estimated values of shear strength parameters of unsaturated soil(c′, ø<SUP>b</SUP>) were slightly larger in the modified direct shear tests due to constraint effect of shear box.
황희연 ( Hui Youn Hwang ),전동원 ( Dong Won Jeon ) 한국패션비즈니스학회 2006 패션 비즈니스 Vol.10 No.2
In this study, physical/chemical characteristics of the fabrics dyed using Japanese pagoda tree which is a yellowish dyestuff was investigated. We tried to estimate the dyeing mechanism among fiber macromolecules, mordants, chitosan, and dyestuffs by measuring the change of air-permeability according to the dyeing process. Also wash fastness and light fastness were measured in order to estimate the fastness according to the dyeing characteristics. When the chitosan pre-treatment was introduced, the wash fastness increased significantly in the cotton fabrics while the fastness did not change in the nylon fabrics significantly. The light fastness was not improved by the chitosan treatment. When the antibacterial activity was measured for the dyed cotton fabrics, Japanese pagoda tree itself did not exhibit antibacterial activity. However, chitosan treated dyed fabrics exhibited low antimicrobial activity.