• 한국의류학회지
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• 제36권6호
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• pp.583-591
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• 2012

This study selected three model designs used for air injection type welding clothes designed for insulation purposes and analyzed the performance of each design. The bending characteristics were analyzed in order to identify the flexibility of the welded areas; subsequently, the seam breaking strength and water pressure resistance were analyzed to identify the bonding strength. In addition, two types of waterproof fabric, polyurethane (PU) coated 2 layer and PU laminated 2 layer fabrics, were used for a performance analysis, according to fabric processing specifications. The circle type showed the highest flexibility in the terms of bending characteristics that influence wearability and were followed by the wave and the straight type. In terms of breaking strength, the straight type showed the highest breaking strength, followed by the wave and the circle type. The water pressure resistance analysis found that the wave type was superior to the straight type in terms of water pressure resistance. The wave type is deemed to be a design type suitable for maximizing performance, provided that the issue of stabilization in the welding production process is addressed. Looking at the bending characteristics of waterproof fabric for each specification, the laminating waterproof cloth outperformed the coated waterproof cloth in terms of flexibility. However, in terms of seam breaking strength, the coated waterproof cloth outperformed the laminated cloth. In contrast, the water pressure resistance of the laminated waterproof fabric was found to be higher than the coated waterproof fabric, leading to the conclusion that the bonding strength of the laminated waterproof fabric is higher than that of the coated waterproof fabric based on the assumption of injecting air.

• 한국해양공학회지
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• 제28권1호
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• pp.28-33
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• 2014

The Korean icebreaking research vessel "Araon" performed four sea trials in the Arctic and Antarctic Seas. The ice properties, such as the ice thickness, floe size, ice strength, and power of the vessel were quite different in these trials. To compare the speeds of ship with the same ice strength and power, the AARC (Arker Arctic Research Center) method is used with a vessel power of 10 MW and an ice strength of 630 Pa in this paper. Based on the analysis results, the speed of the ship was 1.62 knots (0.83 m/s) with a 1.02-m ice thickness and 2.5-km floe size, 5.3 knots (2.73 m/s) with a 1.2-m ice thickness and 1.0-km floe size, and 13.8 knots (7.10 m/s) with a 1.1-m ice thickness and 200-m floe size. The analysis results showed that the ship speed and floe size have an inversely proportional relationship. Two reasonable reasons are given in this paper for the final result. One is an ice breaking phenomenon, and the other is the effect of the ice floe mass. For the breaking phenomenon, the ice breaking force is very small because the ice floe is not breaking but tearing when a ship is passing through a small ice floe. Regarding the effect of the ice floe mass, it is impossible for a ship to push and tear an ice floe if the mass of the ice floe is too large compared to the mass of the ship. The velocity of the ship decreases when the ice floe has a large mass and a large size because the ship has to break the ice floe to move forward.

• 펄프종이기술
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• 제45권3호
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• pp.52-58
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• 2013

To evaluate the anisotropic characteristics of Korean traditional paper-Hanji, the physical and mechanical characteristics of hand-made hanji, and machine-made hanji were investigated in this research. The densities of copying paper and newsprint paper appeared to be two times higher than the densities of hand-made hanji using Ssangbal sheet forming and hanji made of paper mulberry fiber. The breaking length, and tear index of both Hanji using Owangbal sheet forming, and hand-made Hanji using Ssangbal sheet forming appeared to be different according to the directions in paper. The breaking lengths of Hanji using Owangbal sheet forming showed little differences according to the directions. Breaking length of Hanji using Ssangbal sheet were slightly higher than those of Hanji using Owangbla sheet forming. The breaking lengths of machine-made hanji, copying paper, and newsprint paper were two to four times higher than those of hand-made Hanji. The breaking length showed higher differences according to the direction than the tear index. The tensile strength according to the directions in paper showed significant differences (${\alpha}$=0.05) in all papers used in this research.

• 한국양식학회지
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• 제17권3호
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• pp.173-179
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• 2004

본 연구에서는 신속 정확한 육질의 판정을 위하여 사육수조에서 운동여부와 운동 횟수에 따라 양식 활어의 품질지표를 설정하고자 하였다. 수조 내의 유속을 0.1 m/s, 0.3 m/s, 0.5 m/s, 0.7 m/s로 조절하여 양식산 참돔을 20일 동안 하루 6시간 운동시키면서 활어의 파괴강도를 조사하였다. 유속에 따른 차이가 0.5 m/s이상이 되면 차이가나지 않았으며, 유속을 증가시키기 위해 소요되는 부대비용을 감안한다면 최적의 유속은 0.5 m/s가 가장 적합하였다 운동유무에 따른 체성분변화를 살펴보면, 비운동 사육구에서는 사육기간 동안 각 성분들의 유의적 변화가 나타나지 않았지만, 운동 사육구에서는 콜라겐함량을 제외하고 각 성분들의 운동기간동안의 변화가 인정되었다 운동 횟수에 따른 체성분변차를 살펴보면, 2회/1일 운동시킨 참돔이 1회/1일 운동시킨 참돔보다 상관성이 높게 나왔다. 수분함량은 2회/1일 운동시킨 참돔보다 1회/1일 운동시킨 참돔의 증가율이 높았다. 지질함량은 1회/일 운동시킨 참돔에서의 감소율이 2회/1일 운동시킨 참돔보다는 작았지만, 1회11일 운동시킨 참돔도 사육기간 동안 지질은 감소하였다. 운동 횟수와 상관없이 사육기간 동안 콜라겐함량은 큰 증가를 보이지 않았으며, 파괴강도는 증가하는 경향을 보여준다.

• 한국의상디자인학회지
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• 제15권2호
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• pp.57-64
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• 2013

As the clothing materials have been more functional and advanced, the cotton fabrics for dress shirts or blouses have been more qualified and the sewability for high degree of completion has been required. This study aims to identify the seam strength depending on the change of stitch density of fine cotton fabrics by fabric and thread and so the general seam performance of fine cotton fabrics by analyzing the seam efficiency and breaking mode of seams. For an experiment, 3 kinds of fine cotton fabrics and 2 kinds of threads were selected and the sample was made by changing the stitch density by four steps. Then, the seam strength was measured. Next, the seam efficiency and breaking mode of seams were analyzed on the basis of the results of seam strength measurement. The results are as follows: All fabrics showed the similar tendency in seam strength. The seam strength is related to the tensile strength and thread strength, it increased only to a certain stitch density. When the stitch density exceeded a certain level, fabrics were destroyed or threads were cut. Then, the seam strength didn't increase. Furthermore, the more the seam strength increased, the more the seam efficiency increased. For increasing the maximum stitch density, it was required to use the fabrics and threads which had similar properties, in other words, the high thread strength for the high tensile strength and the low thread strength for the high tensile strength.

• Fisheries and Aquatic Sciences
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• 제16권3호
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• pp.143-147
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• 2013

The influence of carrageenan addition on the gelatinization of salt-based surimi gels was investigated by measuring compressive properties and Hunter color scale values. Hydrocolloid kappa (${\kappa}$)-carrageenan at 0%, 0.2%, and 1.0% and NaCl (2% w/w), KCl (1.5% w/w), and a mixture of NaCl (2% w/w) and KCl (1.5% w/w), were added to Alaska pollock surimi. Gel compressive properties were assessed by measuring the breaking force and gel strength. The gelling property of ${\kappa}$-carrageenan-induced surimi gel was significantly increased by the incorporation of KCl rather than NaCl. The addition of ${\kappa}$-carrageenan increased the breaking force and gel strength of surimi gels. Gels with 1% ${\kappa}$-carrageenan and KCl had the highest breaking force and gel strength. The addition of ${\kappa}$-carrageenan caused an increase in the whiteness values of the surimi gels.

• 폴리머
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• 제31권5호
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• pp.410-416
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• 2007

무유화제중합으로 제조된 폴리(메틸 메타크릴레이트) (PMMA) 시드 고분자 미립자에 가교단량체인 HDDA (1,6-hexanediol diacrylate), triEGDMA [tri(ethylene glycol) dimethacrylate] 또는 triEGDMA와 EGDMA (ethylene glycol dimethacrylate)의 혼합액을 흡수시키고, 이를 중합하여 단분산 가교고분자 미립자를 제조할 시 1) 흡수된 가교단량체와 시드 고분자 미립자의 중량비(흡수율) 변화, 2) 가교단량체의 변화, 3) 무전해 니켈도금 및 4) 무전해 (니켈/금)도금에 따른 단분산 가교고분자 미립자의 기계적 물성인 탄성복원율, 압축탄성률, 파괴강도 및 파괴변형률의 변화를 MCT(micro compression test)를 사용하여 측정하였다. 이번 연구를 통해 가교단량체의 흡수율 증가는 가교고분자 미립자의 파괴강도에만 큰 영향을 미쳤으나, 가교고분자 미립자의 무전해 도금은 도금분체의 탄성복원율 및 파괴강도는 감소시키나, 파괴변형률의 경우에는 거의 영향을 미치지 않으며, 압축탄성률의 경우는 $K_{10}$ 및 $K_{20}$는 크게 증가시키나, $K_{30}$ 이후에는 거의 영향을 미치지 못함을 알 수 있었다.

• 한국의류학회지
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• 제9권2호
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• pp.13-26
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• 1985

In this study, when cotton fabrics dyed with Direct dyes are treated under various resin concentration 2, 4, 8, 12, $14\%$ with ureaformaldehyde(UF) and melamineformaldehyde(MF) resin which can be imparted the crease recovery to textiles, chang of properties on lightfastness, washfastness, crease recovery, breaking strength, etc. and color changes are investigated. the results are as follows 1) Color difference(${\Delta}$E) increased but K/S value decreased according to the increase of resin cone. such tendency showed that MF treated fabrics and soaping fabrics were evident than UF treated fabrics and non-soaping fabrics. 2) In lightfastness, ${\Delta}$E and K/S value of resin treated fabrics were reduced as compared with untreated fabrics according to the increase of resin cone. The lower ${\Delta}$E and K/S value of MF than ${\Delta}$E and K/S value of UF showed low lightfastness of MF. pH of resin treted fabrics was almost unaffected with lightfastness. 3) In washfastness, ${\Delta}$E and K/S value of resin treated fabrics decreased slightly as com-pared with untreated fabricsaccording tothe increase of resin cone. The ${\Delta}$E and K/S value of MF decreased lower than UF. But in the case of the higher resin cone. than about $8\%$, they were not almost differentiated. 4) As resin cone. increased, crease recovery considerably increased but breaking strength and elongation decreased. The fabrics treated with UF were good crease recovery, whereas the fabrics treated with MF were good breaking strength. 5) Soaping appeared to improve the lightfastness, washfastness, crease recovery but appeared to work adverse effect on breaking strength.

• 수산해양기술연구
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• 제46권3호
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• pp.257-264
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• 2010

In order to improve the breaking strength and elongation of Polybutylene succinate (PBS) monofilament, the monofilament was produced by blending PBS and Polybutlyne adipate-co-terephthalate (PBAT). The PBS/PBAT blend monofilament was prepared by the melt spinning system, and the weight ratios of the compositions of PBS/PBAT was 100/0, 95/5, 90/10 and 85/15, respectively. The breaking strength, elongation, softness and crystallization of PBS/PBAT blend monofilament were analyzed by using a tensionmeter, softness measurement, X-ray diffractometer in the both dry and wet conditions. The PBS/PBAT blend monofilaments were spun in the take-up velocity of 1.19m/sec under the drawing ratio of 6.8:1 condition. The production volumes of PBS/PBAT blend monofilaments showed 20% less than that of Nylon. The breaking strength of PBS/PBAT blend monofilaments were decreased as PBAT contents increased, while elongation and softness were increased. In case of PBAT content were over 5%, the breaking strength, elongation and softness of PBS/PBAT blend monofilaments were not shown to increase in spite of increasing in PBAT contents. Based on these results, it was possible to make the monofilaments with the maximized physical properties when the PBAT contents at 5%.

• 한국의류산업학회지
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• 제3권5호
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• pp.486-491
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• 2001

The purpose of this study was to examine the effects of chemical finishes on performance characteristics of microfiber blend fabrics. A 60% polyester microfiber/40% cotton blend woven fabric was finished by ten chemicals: three silicone softeners, one fluorochemical, and their mixtures. Performance characteristics examined were abrasion resistance, and oil/water repellency. Chemical finishes containing dimethylpolysiloxane silicone performed better in fabric abrasion resistance than other chemicals. The correlation between abrasion wear and instrumental measures of fabric hand indicated that the breaking strength loss by abrasion related negatively to the coefficient of friction. This implied that the finished fabrics with lower surface frictional coefficient (slipperier) had higher breaking strength loss by abrasion. The microfiber structure of polyester did not appear to help in oil/water repellency due to the larger surface areas of the microfibers. The fluorochemical finished fabric had the most significant improvement on oil/water repellency. The silicone-only finishes, however, did not improve oil/water repellency. When mixed with the fluorochemical, silicone finishes showed improved oil/water repellency.