• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.50-50
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• 2011

국내 섬유산업은 해외로부터의 저가 섬유제품이 대량으로 유입되는 속에서도 수출의 상당한 부분을 차지하며, 꾸준히 양에서 질로의 전환을 도모해 왔으며, 특히 최근에는 섬유 전반에 걸쳐 고부가 가치화를 지향하고 있다. 이러한 소비자의 요구에 부응하여 섬유소재에도 다양한 신개념과 이를 충족시킬 수 있는 기술이 요구되고 있으며, 그 가운데 하나의 영역을 구축해 나가고 있는 분야가 면 리플가공과 같은 표면 형태 가공이며, 최근 들어 폴리에스테르 입체(3D)가공제의 개발 및 가공 방법도 이런 흐름에 부응하여 업계에서 절실한 개발을 요구하고 있는 분야이다. 기존의 폴리에스테르 및 합성섬유의 입체 가공에 적용된 화학제품보다 성능은 우수하면서, 가공 공정이나 완성된 섬유제품에 전혀 잔존하지 않아 인체친화적(기존의 제품들은 인체에 유해한 재료이면서 가공 후 잔존함)이며, 환경적인 측면에서도 친환경을 유지하면서 새로운 폴리에스테르섬유, 좀 더 폭넓게는 열가소성인 모든 합성섬유의 입체가공이 가능한 약품의 개발 및 이를 이용한 가공방법의 개발은 매우 중요한 의의를 가지게 된다. 본 연구에서는 폴리에스테르의 3D입체 디보싱을 부여하는 합성바인더가 물에 의한 용해도를 확인하기 위하여 용액의 PH에 따른 용해성 시험을 진행하였으며, 합성한 발포제의 양에 따른 3D입체형성 정도를 이미지로 형상화 하였다.

• Journal of Nutrition and Health
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• v.41 no.1
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• pp.100-110
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• 2008

The present study estimates intake levels of dietary fiber (DF) in Korean adults aged 20 and over, using a newly established dietary fiber database for 3,149 food items, as well as 24-hour recall method data from the 2001 Korean National Health and Nutrition Survey. Dietary fiber intake and food groups are analyzed by gender, age, and region. The average dietary fiber intake, per capita of Korea was estimated to be 12.24g/1,000kcal or 23.58g/day. Calorie-based dietary fiber intake for 20-49 year-old-Korean males, 20-29 year-old females, and the adults who resided in metropolitan areas was under the Adequate Intake for DF, 12 g/1,000 kcal. Further, the dietary fiber intake after adjusting energy intake in people over 75 year-old was estimated to be 75% of AI. Vegetables, cereals and fruits were three major sources of DF for Korean, making up approximately 75% of DF. Regarding the subjects of this study, major sources of dietary fiber were Kimchi and well-polished rice, which supplied 13.98% and 9.16% of total dietary fiber intake, respectively. The result of this study could contribute to the establishment of DRIs for dietary fiber, after adjusting energy intake for Korean aged 75 years and over. The beneficial health effects of DF and the necessity of nutritional education in this area should be continuously emphasized concerning 20-29 year-old people and metropolitan adults.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.462-464
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• 2022

의료영상기반의 인공지능 연구는 질환의 조기진단 및 예측 분야에 눈부신 기술발전이 되어왔다. 장기 섬유증은 만성 염증성 질환의 질병 진행을 특징짓고 전 세계적으로 모든 원인으로 인한 사망률의 45%에 기여하며, 그중 간 섬유증은 주로 삶의 질과 예후를 결정한다. 해당 질환은 임상 현장에서 혈액데이터 분석 그리고 간생검을 통해 진단을 하고 있으나 최근 의료영상 분석을 통해 진단에 활용하고 있는 추세이다. 본 논문에서는 인공지능을 기반으로 하여, 간 섬유화를 진단하기 위해 MRI영상을 학습하여 질환에 대한 중증도 진단을 돕는 인공지능 모델을 제시하고자 한다. 이를 위해 인공지능 모델을 개발하는 과정과 그 결과를 보인다. 본 논문에서 제시한 모델을 통해 간 섬유화를 빠르게 진단할 수 있을 것으로 기대한다.

• Journal of Conservation Science
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• v.35 no.6
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• pp.612-620
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• 2019

A woolen tapestry curtain, owned by the Seoul Museum of Craft Art, is composed of tabby by cotton-warp and wool-weft threads and its patterned part is shown as a tapestry; paint with pigment has been added to it. The chromaticity of this curtain was measured and the substances in the deep red color were confirmed as Hg by an analysis of the ingredients through X-ray fluorescence. This is presumed to be cinnabar or vermilion. Analyses were performed on a total of seven fabric samples, including the warp & weft of the fabric, its trimming, and its back fabric. As a result, the warp of the woolen tapestry curtain was determined to be a cotton fiber with a middle hole or lumen in the cross-section. Furthermore, an infrared peak likewise showed O-H and C-O binding. Wool fibers as wefts were identified with circular and oval cross-sections and IR peaks showed N-H/O-H stretching and amide(-CONH-). The animal hair samples used in the wool fiber are believed to have come from long-tailed goral or goats and the possibility of using easy-to-spin sapsal dog hair is also not to be overlooked. This was determined through a contrast analysis by the Cultural Heritage Administration to identify the animal species used in the tapestry.

• The Journal of Korean Physical Therapy
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• v.15 no.4
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• pp.1-12
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• 2003

The purpose of this study was to investigate the effect of high voltage pulsed current stimulation (HVPCS) on the healing rate of a dermal wound in a rat. We also determined the mechanism of promoting healing by HVPCS. Twenty male Sprague-Dawley rats were randomly divided into two group; HVPCS group (n=10) and control group (n=10). The HVPCS rats received electrical stimulation with a current intensity of 50 V at 100 pps for a duration of 30 minutes, while the control group was given the same treatment without electricity for a week. The biopsy specimens were fixed in formalin, embedded in paraffin and stained with Masson's trichrome, hematoxylin and eosin (H&E). The fibroblasts and collagen density were counted using a light microscope and computerized image analysis system and calculated as the density and the percent. A Student t-test showed a significantly higher wound healing rate of the HVPCS group than control (t=-4.161, p<0.001). The fibroblasts in the HVPCS group were higher than in the control group (t=-4.921, p<0.001). The density of collagen in the HVPCS group was also higher than in the control group (t=-4.367, p<0.001). These results indicate that the HVPCS accelerated the rate of healing in dermal wound, and increased fibroblasts and collagen density in the regenerative dermis. These findings suggest that the HVPCS may activate fibroblasts by alteration of the electrical environment, and it may increase collagen synthesis in the regenerative dermal wound.

• Science of Emotion and Sensibility
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• v.10 no.4
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• pp.623-629
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• 2007

Recently, the $"Optim"^{(R)}$ which is the wool fibre with high lustre developed by CSIRO in Australia is imported and commercialized as a high sensible fabrics for garment. But the price of this $"Optim"^{(R)}$ fibre is very high so material demand and supply is not smooth. This study is aiming to develop the drawing technology of the worsted yarn with washable function, lustre and low production cost. For this purpose, drawing yarns are made using developed drawing machine and high sensible fabrics are woven using this yarns, and various physical properties of the fabric specimen are measured and analysed with garment characteristics such as sewability and formability. The final objective of this study is seemed to be achieved by making the high sensible fabrics using drawing worsted yarns with high lustre such as $"Optim"^{(R)}$ fibre.

• Journal of the Korean Wood Science and Technology
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• v.43 no.6
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• pp.730-739
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• 2015

Various cellulose nanofibers (CNF) with different morphology and chemical properties were prepared for the reinforcement of sheet of paper mulberry bast fiber. Lignocellulose nanofiber (LCNF), Holocellulose nanofiber (HCNF), alkali-treated HCNF (AT-HCNF), TEMPO-oxidated nanofiber (TEMPO-NF) and cellulose nanocrystal (CNF) were prepared and their addition effect on the properties of sheet of paper mulberry bast fiber were investigated. Air permeability, surface smoothness, and tensile properties were improved by increasing CNF addition. Its improvement may be due to the CNF deposited between and on paper mulberry bast fibers, which was confirmed by SEM observation.

• Journal of the Korean Geotechnical Society
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• v.23 no.8
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• pp.159-169
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• 2007

The behavior of fiber-reinforced cemented sands (FRCS) was studied to improve a brittle failure mode observed in cemented sands. Nak-dong River sand was mixed with ordinary Portland cement and a Polyvinyl alcohol (PVA) fiber. A PVA fiber is widely used in concrete and cement reinforcement. It has a good adhesive property to cement and a specific gravity of 1.3. A PVA fiber has a diameter of 0.1 mm that is thicker than general PVA fiber for reinforced cement. Clean Nak-dong River sand, cement and fiber at optimum water content were compacted in 5 layers giving 55 blows per layer. They were cured for 7 days. Cemented sands with a cement/sand ratio of 4% were fiber-reinforced at different locations and tested for unconfined compression tests. The effect of fiber reinforcement form and distribution on strength was investigated. A specimen with evenly distributed fiber showed two times more strength than not-evenly reinforced specimen. The strength of fiber-reinforced cemented sands increases as fiber reinforcement ratio increases. A fully reinforced specimen was 1.5 times stronger than a specimen reinforced at only middle part. FRCS behavior was controlled not only by a dosage of fiber but also by fiber distribution methods or fiber types.

• Journal of Korean Tunnelling and Underground Space Association
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• v.17 no.3
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• pp.283-293
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• 2015

In order to evaluate corrosion resistance of steel fiber-reinforced concrete, accelerated chloride migration and surface resistivity tests were conducted. In addition air content of fresh concrete, compressive strength and water absorption were measured for investigating fundamental characteristics of concrete. Two different water-cement ratios(0.44, 0.5) and three steel fiber contents(0.25%, 0.5%, 1%) were considered as variables. Note that all specimens cast with same compaction work. As a results, corrosion resistance decreased as steel fiber contents increased regardless of water-cement ratio when the concrete was compacted with same amount of work done. However, for concrete with same steel fiber content, the lower water-cement ratio showed the better corrosion resistance. It is found that enhancement of fluidity and enough compaction should be done for corrosion resistance of SFRC.

• Composites Research
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• v.18 no.3
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• pp.31-37
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• 2005

In this work, poly(ethylene oxide) (PEO) nanofibers were fabricated by electrospinning to prepare the nanofibers-reinforced composites. And the PEO powders-impregnated composites were also prepared to compare the mechanical interfacial behaviors of the composites. Morphology and fiber diameter of PEO nanofibers were determined by SEM observation. Mechanical interfacial properties of the composites were investigated in fracture toughness $(K_{IC})$ and interlaminar shea. strength (ILSS) tests. As a result, the fiber diameter was decreased with increasing the applied voltage. And optimum condition for the fiber formation was 15 kV, resulting from increasing of jet instability at high voltage. The PEO-based nanofibers-reinforced epoxy composites showed the improvements of both $K_{IC}$ and ILSS, compared to the composites impregnated with PEO powders. These results indicated that the nanofibers had higher specific surface area and larger aspect ratio than those of the powders, which played an important role in improving the mechanical interfacial properties of the composites.