• Journal of the Korea Concrete Institute
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• v.24 no.2
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• pp.173-183
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• 2012

Recently, experimental studies to prevent explosive spalling based on spalling mechanism and addition of Polypropylene fiber in high strength concrete (HSC) are performed actively. However, with respect to ultra high strength concrete (UHSC), its compact internal structure is more difficult release vapor pressure at rapid rising temperature compared to HSC. Therefore, in this study, an experiment was conducted to evaluate spalling properties of UHSC using ${\Box}$ $100mm{\times}100{\times}H200mm$ rectangular specimen according to ISO-834 standard fire curve. With respect melting point of fiber, three fiber types of Polyethylene, Polypropylene, and Nylon fibers with melting temperature of $110^{\circ}C$, $165^{\circ}C$, and $225^{\circ}C$, respectively, were considered. Mixed fiber of 0.15% and 0.25% of concrete volume was used to consider spalling properties based on water vapor pressure release. Then, TGDTA test on fiber and FEM analysis were performed. The results showed that it is difficult to prevent initial spalling without loss of fiber mass even if fiber melting temperature is low. Also, in preventing thermal spalling, fiber that melts to rapidly create porosity within 10 minutes of fire is more effective than that of low melting temperature property of fiber.

• Journal of Sericultural and Entomological Science
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• v.27 no.2
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• pp.54-63
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• 1985

This studies has been carried out how to effect on electrostafic propensity of synthetic fabrics by coating with 0.5% acrylic polymer solution which was previously developed by the author to improve anticrease nature of silk. The work conditions are: (A) Applied synthetic polymer was acrylic polymer 525, developed by the author. (B) Electrostatic voltage for various fabrics were carried out by Korea standard abrasion partner with Korea standard (KS K 0905) cotton, nylon, polyester and the self sample fabric. (C) Applied fabrics for the investigations were carried out by using abrasion partner with Korea standard (KS K 0905) cotton, nylon, polyester and the self sample fabric. (D) Electrostatic propensity investigations were carried out by use of sample as silk, nylon, polyester and acrylic fabrics, seperating before finish or after finish. (E) Washing after the finish or the original fabric was carried out by Korea standard method, KS K 0465. Through the investigations, he happened to find many interesting matters and the obtained results are as followings. 1. Electrostatic voltage for the finished fabrics increased more than their original silk, nylon, acrylic fabrics except polyester fabric. (See Table 5) 2. Electrostatic voltage for the finished polyester against K.S. polyester decreased remarkably than the original fabric test. 3. In spite of no problem on electrostatic propensity of silk, it showed high electrostatic voltage between the same nature fabric abrasion, because silk is very weak against abrasion and because the test method had been developed to be useful for only synthetic fabrics. 4. Electrostatic voltage increased more in case of abrasion between different nature of fabrics than the same nature of fabrics. 5. Electrostatic voltage of each fabric increased by repeat of wash. 6. Many investigation data were followed with Contact Electrification Series Principle, another word, the farther each other located fabric on the series abrasion was, the higher electrostatic voltage. (See Fig. 6) 7. Such investigation gives warning of use on the mix fiber spinning service as far as concern with electrification. 8. It may also call attention for such increase of electrification in case any finishing of silk textile.

• Asian-Australasian Journal of Animal Sciences
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• v.11 no.2
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• pp.128-132
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• 1998

The relative disappearance and rate of degradation of dry matter (DM) and neutral detergent fiber (NDF) of nine different feedstuffs were determined by simultaneously suspending groups of substrates, using the nylon bags, in the rumen of males of Sahiwal cattle and Nili-Ravi buffalo. The digestion kinetics of leguminous forages (Lucerne, berseem and cowpeas) and feed byproducts (cotton seed cake, wheat bran and wheat straw) did not differ between the two species. However, the DM and NDF digestibilities and rates of digestion of grasses and wheat straw were greater in buffalo than in cow bulls, indicating that buffaloes are better converters of poor quality roughages than are Sahiwal. The lag time for DM of grasses did not differ between these two species but the NDF lag time was lower in buffalo than in cows, indicating that both the rate and lag time of digestion may be reliable indicators for assessing the NDF quality.

• Journal of Fashion Business
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• v.13 no.5
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• pp.55-65
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• 2009

Metal complex dyes are usually used to dye amide fiber such as wool, silk and nylon to achieve high concentrated color and excellent color fastness. However, metal complex dyes that contain various heavy metal components cause not only serious environmental problem but also human health. In this study the ordinary 1:2 metal acid dyes and the modified 1:2 metal dyes, which are environmental friendly, are compared and analyzed in existing dyes investigated the trends in the evaluation system of their harmfulness, containing heavy metals and examined exhaustion rates and dyeing characteristics.

• Textile Coloration and Finishing
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• v.5 no.2
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• pp.99-108
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• 1993

In one dyeing system of silk/synthetic blend fabrics (polyester, nylon, acetate) with acid dyes/disperse dyes, dyeability and desorptibility of disperse dyes on silk fabric and transfer from dyed silk fabrics to synthetic fabrics by color difference were examined. When silk dyed with C.I. Disperse Red 19 and C.I. Disperse Red 60 at 10$0^{\circ}C$ for 60 minutes, color difference of dyed silk were $\Delta$E=56.72, $\Delta$E=47.65 for blank silk, respectively. The desorption rate of the dyed silks were measured in boiling bath with and without dye-free synthetic fibers. The desorption rate of dyed silk was effected by affinity of synthetic fabrics contained. When silk dyed with Red 19 and Red 60 was reduced at 10$0^{\circ}C$ for 60 minutes, the decolouration rates of dyed silk were 75% and 40%, respecdtively.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.10a
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• pp.252-256
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• 2002

본 연구에서는 유리섬유/나일론 6 복합재료의 계면특성에 미치는 실란계 사이징제의 영향을 조사하기 위하여 microbonding test, short-beam shear test 그리고 dynamic mechanical analysis 방법을 사용하였다. 전자의 미시적인 방법과 후자의 두 가지 거시적인 접근 방법으로부터 얻은 유리섬유/나일론 6 복합재료의 계면특성에 대한 결과가 서로 일치하였다. 상업적으로 사이징 처리된 경우와 비교할 때, 본 연구에 적용된 네 종류의 실란계 사이징제는 유리섬유-나일론 6 수지의 계면결합력을 크게 향상시켰다. 특히, 3-chloropropyltrimethoxysilane (Z-6076)의 사용은 유리섬유/나일론 6 복합재료의 계면전단강도와 층간전단강도를 가장 두드러지게 증가시켰다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.4
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• pp.602-609
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• 2001

This paper is concerned with the orthotropic problem of diaphragm-type air springs which consist of rubber linings, nylon reinforced rubber composite and bead ring. The analysis is carried out with a finite element method developed to consider the orthotropic properties, geometric nonlinearity using four-node degenerated shell element with reduced integration. Physical stabilization scheme is used to control the zeroenergy mode of the element. The analysis includes an inflation analysis and a lateral analysis of an air spring for the deformed shape and the spring load with respect to the vertical and l ateral deflection. Numerical results demonstrate the variation of the outer diameter, the fold height, the vertical force and the lateral force with respect to the inflation pressure and the lateral deflection.

• Journal of the Korean Society of Costume
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• v.15
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• pp.149-166
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• 1990

Korean clothes is traditional folk costume native to Korea, Which is in Korea clothes. The past Korean costume was developed in the native costume, together influenced by chinese costume. But in the late Yi dynasty the contact with western countries brought about a turning point in Korean costume history, with rapid growth of economy since Korean war in the 1950's, the magnification of industrial structure, the development of productive technique, transformation of consumption pattern and the development of communication have been increased concerns for the western costume. In 1953 the introduction of nylon which was imported from Japanese brought about a fuming point in clothing habits. In 1967 the development of the fiber industry got a firm stand in ready-made clothes. Consequently our traditional Korean clothes was regarded as nonfunctional, nonproductive and it was pushed out of daily life little by little and it was deprived of the function of ordinary costume by the influence of western costume. But in these days the Korean clothes appears as the desire of pursuing traditional style in addition to mordern style of Korean clothes.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.274-279
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• 2000

This paper is concerned with the orthotropic problem of diaphragm-type air springs which consist of rubber linings, nylon reinforced rubber composite and bead ring. The analysis is carried out with a finite element method developed to consider the orthotropic properties, geometric nonlinearity using four-node degenerated shell element with reduced integration. Physical stabilization scheme is used to control the zero-energy modes of the element. An inflation analysis and a lateral deformation analysis of an air spring are carried out. Numerical analysis results demonstrate the variation of the outer diameter, the fold height, the vertical force and the lateral force.

• Proceedings of the Korean Society For Composite Materials Conference
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• 1999.04a
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• pp.29-33
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• 1999

this paper concerned with the stress analysis of a diaphragm-type air spring which consists of rubber linings nylon reinforced rubber composite. The analysis is carried out with a finite element method developed to consider the orthotropic properties geometric non-linearity and contact between an air bag and a bead ring The material properties are evaluated with the Halpio-Tsai equations and the rule of mixture. The analysis results demonstrate the variation of the outer diameter the fold height and the vertical force with different models to the design a proper diaphragm air springs.