• Journal of Chest Surgery
• /
• v.29 no.4
• /
• pp.373-380
• /
• 1996

Prevention of thromboembolism is the most important task in the development of bioconpatible small caliber artificial vascular graft. In normal vessels, vascular endothelial cells maintain homeosatsis by secreting numerous factors. The aim of this study is to develope a method which Improves biocompatibility of small caliver polyurethane graft using endothelial cell culture technique, and ev luate the efTectiveness of extracelluar matrix for endothelization which was produced by cultured fibroblast. Methods ; Multiporous polyurethane tube of 3 mm diameter, 0.3 mm thickness was manufactured for vascular graft. Three mongrel dogs were intubated and internal jugular veins removed. Extracelluar matrix produced by cultured flbrobast which was obtained from dog's internal jugular vein were coated to the polyurethane graft. Then, endothelial cells extracted from Jugular vein were cultured and fixed on the extracelluar matrix layer of vascular graft. Endothelial cell coated vascular grafts were implanted to the carotid arteries of experimental dogs as interposed autograft. Implanted grafts were removed after 3 and 6 weeks. As a control, PTFE graft was interposed on carotid artery. These experiments demonstrated that extracelluar matrix produced by fibroblast can afford a base for endothelial cell linings of polyurethane graft. Although thrombosis were developed on autografted en othelial cell coated graft, 33% opening was noticed, and showed less adhesion to adjacent tissue layer. These findings suggest that fiboblast produced extracelluar matrix which can be used for edothelial cell lining vascular graft, and by improving the cultured endothelial cell function, there will be a new modality for reducing thrombosis on small vascular graft.

• Journal of the Society of Naval Architects of Korea
• /
• v.31 no.1
• /
• pp.22-31
• /
• 1994

Fish aggregating devices(FAD) or artificial fish reefs deployed in the ocean space have been developed in various forms. The objective of FAD is to aggregate, cultivate and proliferate aquatic resources by making changes in ocean flows around it. developing spawning grounds, improving feeding areas and protecting larvae and juveniles. Most floating fish aggregating devices(FFAD) are in the form of surface buoys or subsurface buoys with a single point mooring system(SPMS). The mooring line of SPMS for the secure positions of FFAD is expected to keep great stresses as a result of the harsh ocean environment. Laboratory static tests on synthetic fiber ropes used for the SPMS were run. The Nylon wet rope specimen tests under increasing-and-decreasing loads showed about 20% strength drop. Also the logarithmic creep-tie behavior of fiber ropes was observed in the constant load test and compared with Flessner's formula.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.24 no.6
• /
• pp.828-837
• /
• 2000

The purpose of this study was to evaluate the physical properties and the hand of bast/man made fiber mixed fabrics compared to linen. The mixed fabrics were made by rayon, polyester and modal fiber as warp yarn, and ramie, flax, rayon/flax and cotton/flax as weft yarn. The crease resistance, drape, tensile strength/extension, water absorbancy and warmth retention were measured for test fabrics. The mechanical properties were measured by Kawabata system, and the hand value was calculated by previously developed equation. The results obtained from this study were as follows: The crease resistance and drape properties of bast/man made fiber mixed fabrics were improved compared to those of linen. The tensile strength of polyester/bast fiber mixed fabrics increased compared to those of linen, but rayon/bast and modal/bast fiber mired fabrics decreased. The extension of all mixed fabrics was increased compared to that of linen. The rayon/ramie and modal/ramie mixed fabrics showed lower warmth retention than linen. The mixed fabrics used rayon and modal as warp yarn showed higher water absorbancy than linen. The Koshi and Hari hand value of all mixed fabrics showed lower than those of linen. Fukurami hand value showed little difference between mixed fabrics and linen. Shari, Kishimi, and Shinayakasa hand value of rayon/bast and modal/bast fiber mixed fabrics showed higher than those of linen.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2013.05a
• /
• pp.321-322
• /
• 2013

Recently, the exhaustion of resource and environmental damage is serious due to the global warming because of the CO₂ exhaust and each type the natural aggregate picking described below. meanwhile, The rest is the actual condition gone to the dumping ground that there is nearly no use which the waste glass can recycle and it is recycled. This research applied the waste glass as the cement substitute material the inorganic binder and coares aggregate substitute material. It utilizes the substitute material of the cement according to it and natural aggregate and tries to develop the environment-friendly artificial stone. The inorganic binder used the blast furnace slag, red mud, and fly ash. The straight type steel fiber, PVA fiber, PA fiber, and cellulosic fiber were used with a kind of fiber. As to the experimental item according to it, the compressive strength is the flexural strength and compressive strength.

• Composites Research
• /
• v.26 no.5
• /
• pp.328-333
• /
• 2013

In this study, bone plate made of glass/polypropylene composite material which was applied to an artificial bone was tested to check the service ability under fatigue loading. To check serviceability of composite bone plates fatigue test was carried out considering changes in the moisture absorption rate, locking position of screws and loading condition. Test results showed that all the tested specimens had the fatigue life more than one million cycles which was much higher fatigue life than the expected value of 650,000 cycles. Screw position was not critical impact on the deformation of the fracture site. In this paper, the mechanical performance of the glass/polypropylene composite was verified by fatigue test under various water absorption conditions, and this result may give useful information on the design of composite bone plate.

• 프린팅코리아
• /
• v.10 no.9
• /
• pp.104-105
• /
• 2011

지난 8월 1일부로 한 페루 FTA가 발효됨에 따라 한국무역협회에서 '한 페루 FTA발효와 수출확대 수혜품목'에 대한 연구를 발표했다. 한국무역협회에 따르면 페루와의 교역이 우리 교역에서 차지하는 비중이 작아 EU, 미국 등 거대경제권과의 FTA만큼 우리 경제에 미치는 영향이 크지는 않겠지만, 페루의 빠른 경제성장과 높은 관세율 때문에 중소기업에는 특히 유리할 것이라고 발표했다. 우리나라가 페루에 수출하는 품목가운데 종이제품, 잉크 등의 품목은 실적은 미미하지만 페루의 수입 수요가 크고 높은 관세(최고 17%) 철폐로 국내 중소기업들이 수출에 적극 나설 경우 높은 성과를 올릴 것으로 보인다. 또한 인쇄용지 등은 관세가 10년 동안 철폐되지만 관세율이 9~17%로 높은 만큼 관세 철폐 효과가 지속적으로 나타날 전망이다. 한편 중대형 자동차, 컬러 TV,일부 의약품, 인조섬유, 비디오, 카스테레오 등은 9%의 관세가 즉시 혹은 5년 내에 철폐되어 단기간에 관세 철폐 수혜를 입을 것으로 보인다.

• Textile Coloration and Finishing
• /
• v.11 no.1
• /
• pp.48-60
• /
• 1999

In this paper, a new regenerated celluosic fiber, "Tencel" was treated with cellulase enzyme. Also Tencel fabrics were pretreated with NaOH and dyed with various reactive dyes, and subsequently finished with DMDHEU. $\Delta{E}^*_{ab}$ value was calculated by measuring color difference before and after wet abrasion test to rubbing. The fibrillation propensity was estimated on Tencel by means of weight loss, $\Delta{E}^*_{ab}$ value, and SEM observation. Weight loss of NaOH pretreated Tencel fabric is more lower than that of original fabric. The cellulase treatment decreased tensile strength but improved wet abrasion strength, wrinkle recovery, and bending properties. Tendency of fibrillation for Tencel fabric was reduced by NaOH-pretreatment, dyeing with multifunctional reactive dyes, and afterfinishing by DMDHEU.by DMDHEU.

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.10b
• /
• pp.267-268
• /
• 2003

실크 피브로인은 천연 고분자 물질 중 하나로 Bombyx mori와 Antheraea perni 등이 있으며 생체적 합성을 가지고 있어 효소고정화를 위한 매트릭스나 세포배양용 지지체와 같은 의료용 분야에서 활발히 연구되고 있다. 또한 키토산은 키틴이 50% 이상 탈아세틸화된 것으로 갑각류, 곤충류, 균류 등에 존재하며 창상피복재, 인조 피부 등의 의료 분야에서 광범위하게 사용되고 있다. 본 실험에서는 실크 피브로인에 단독으로는 전기방사가 되지 않는 키토산을 다양한 비율로 블렌드하여 키토산이 실크 피브로인의 전기방사된 섬유의 형태에 미치는 영향에 대하여 알아보았다. (중략)

• Proceedings of the Korean Society of Dyers and Finishers Conference
• /
• 2012.03a
• /
• pp.117-117
• /
• 2012

Dyeing and fastness properties of 800nm sea-Island type PET nanofilament fabrics have been investigated. The dye uptake of nanofilament commended at lower temperatures and showed faster rate of dye uptake. The build up and wet fastness propertied of disperse dye on nanofilament were relatively poor since the more dye was needed to achieve a given depth of shade due to the large surface area.

• Proceedings of KOSOMES biannual meeting
• /
• 2018.06a
• /
• pp.169-169
• /
• 2018