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드래프트 조건이 조사의 물리적 성질에 미치는 영향 (III)
박창혁,노정익,김수봉,Park, Chang-Hyeok,No, Jeong-Ik,Kim, Su-Bong 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.4
In order to investigate the linear and quadratic effects of drafting conditions i.e., twist, draft ratio, and roller gauge on the physical properties of several roving i.e., drafting force, tensile strength, elongation, and evenness, statistical methods such as 33 factorial design and multiple linear regression analysis have been used. The draft ratio was the main factor influencing the physical properties of roving. All the drafting conditions influenced the physical properties in a linear manner for all the specimens, but in a quadratic manner, showed partially different results and a carded roving was less significant than other combed roving. Among the physical properties, the elongation was not influenced by the drafting conditions in two-factor interaction. In the multiple linear regression analysis, the twist gave a negative effect on the evenness, but positive on others. The draft ratio and roller gauge gave a positive effect on the evenness, but negative on others.
2차원 Random 섬유복합체의 섬유간접촉점 수의 이론적 확률
박창혁 혜전대학 1994 論文集 Vol.12 No.-
The probability of any two fibres intersecting within a two-dimensional random fibre composite can be estimated by the use of Buffon's Needle problem. In addition, the mean and variance of the number of intersections per unit area and their coefficient of variation are calculated as a function of fibre length, fibre density and the area of measurements. For non-random composites where fibers are oriented, a class of density functions for orientation angle give rise to equations for predicting the probabilities of intersection.
Weight- biased 표본에 의한 섬유직경의 변동측정 (III) -합성섬유의 직경의 분산추정-
박창혁,노정익,우제린,Park, Chang-Hyeok,No, Jeong-Ik,U, Je-Rin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.7
The inferiority of the variance estimates of synthetic staple fibre diameter when compared to those from the wool tops implies that a special calibration of air flow apparatus is required for synthetic staple fibres. The rapidity and accuracy in the determination of the fibre diameter variance estimate are the main features of the methods developed in this study. Additional work is desirable to provide and improved stream of input fibres to the throwing device.
Weight-biased 표본에 의한 섬유직경의 변동측정(I) -Weight-biased 표본의 구성이론-
박창혁,노정익,우제린,Park, Chang-Hyeok,No, Jeong-Ik,U, Je-Rin The Korean Fiber Society 1990 한국섬유공학회지 Vol.27 No.5
In order to estimate the variance of fibre diameter from a given sample of fibres cut to an identical length, a fibre thrower, using centrifugal force, and an appropriate template have been devised. An optimum cut length was found to be 10mm long. The new method provides satisfactory weight-biased samples when the optimum cut length was employedd.
드래프트 조건이 조사의 물리적 성질에 미치는 영향(II) -균제도와 신도-
박창혁,김수봉,노정익,Park, Chang-Hyeok,Kim, Su-Bong,No, Jeong-Ik 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.7
Investigation has been carried out on the physical properties of several cotton rovings in various drafting conditions, such as twist, drat ratio and roller gauge. The evenness and elongation were measured and analysed by the statistical method-33 factorial design. It was found that all the drafting conditions influenced the evenness and elongation in a linear manner for all the specimens, and the draft ratio was main factor influencing the evenness and elongation. In two factor interaction twist and draft ratio were the main factor influencing the above properties.
Weight-biased 표본에 의한 섬유직경의 변동측정(II) -양모의 직경의 분산 추정-
박창혁,노정익,우제린,Park, Chang-Hyeok,No, Jeong-Ik,U, Je-Rin 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.6
Instead of obtaining the whole distribution with a sophisticated instrument, a variance estimate for the fibre diameter may be determined - using weight - biased samples obtained from specially designed test method (previously reported in part 1) - with the existing air flow apparatus. The coefficients of variation of diameters estimated by the new methods, empirical and theorytical under the normality assumption of the fibre diameter, are in excellent agreement with the comparable values obtained by the projection microscope. For the purpose of increasing the precision and accuracy of fineness test with the air flow apparatus, a spacer technique has been successfully adopted.
Investigations on the Measurements of Fiber Diameter
Park, Chang Hyouck 혜전대학 1995 論文集 Vol.13 No.-
An estimate for the fiber diameter may be determined using weight-biased samples on the existing air flow apparatus, e.g, Micronaire, WIRA meter. A simple centrifugal device in combination with a quadratic template provides the required wight-biased samples. Resulting precision and accuracy of the measured data point to an excellent practicality and cost effectiveness of the proposed procedure.
포름알데히드로 세리신 정착 후 정련에 의한 실크 생사의 반숙 정련
박건용,박창혁,정화진,이미연,이정주,박두경,Park, Geon Yong,Park, Chang Hyouck,Jeong, Hwa Jin,Lee, Mi Yeon,Lee, Jung Ju,Park, Du Keong 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.5
To obtain the half-degummed silk yarns of 5~10% degumming losses, raw silk yarns were degummed with alkaline detergent after fixing sericin with formaldehyde. Adding above 5 g/l acetic acid or tartaric acid in 1% and 5% formaldehyde fixing baths created a lot of sericin loss during degumming with 3 g/l alkaline detergent and 2 g/l sodium carbonate after fixing sericin due to alkaline hydrolysis of sericin cross-linkage. When sericin was degummed with 3 g/l alkaline detergent after fixing with 0.1% formaldehyde at $40^{\circ}C$ or $60^{\circ}C$ for 15 min, the degumming temperature necessary to obtain satisfactory half-degumming was $70{\sim}80^{\circ}C$. Also, fixing sericin at $60^{\circ}C$ resulted in stronger sericin fixation than fixing at $40^{\circ}C$. However, the softener of cationic surfactant added in sericin fixing baths did not prevent the attachment of degummed silk yarns. Approximately 6.5% degumming loss was obtained when sericin was degummed at $85^{\circ}C$ for 30 min with 3 g/l alkaline detergent after fixing with 0.1% formaldehyde at $80^{\circ}C$ for 15 min and 30 min, and in case of adding 2 g/l acetic acid in fixing baths the half-degummed silk yarns of about 10% degumming losses, which were severely attached to each other, were obtained.