• Title/Summary/Keyword: 섬유성

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Study for Predicting Mechanical Properties Depending on Fiber Orientation in Injection Molded Short-Fiber-Reinforced Plastic Parts (단섬유보강 플라스틱 사풀성형제품의 섬유방향성에 따른 기계적성질 예)

  • 권태헌
    • The Korean Journal of Rheology
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    • v.8 no.2
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    • pp.78-91
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    • 1996
  • 단섬유 보강 플라스틱 복합재료에 사출성형에서 섬유배향은 금형 충전 공정 중의 유동장에 의해 결정되고 섬유의 배향 상태는 역으로 유동장에 영향을 미친다. 단섬유에 의 한 추가적인 응력을 포함하는 Dinh과 Armstrong의 이방성 구성방정식을 충전유동과 섬유 배향의 연계해석에 도입하였다. 충전유동의 해석은 새로운 압력 지배방정식과 에너지 방정 식을 유한요소법과 유한차분법을 이용하여 풀고 동시에 2차 배향 텐서의 변화방정식을 4차 Runge-kutta 방법으로 풀었다. 섬유의 배향상태를 구한 후에 일방향성 복합재료의 Halpin-Tsai 식과 배향 평균모델을 도입하여 사풀성형품의 이방성 기계적 성질이 예측되었 다. 직사각형 캐비티에서 수치해석결과를 실험결과와 비교하였다. 섬유배향과 유동과의 상호 연계작용을 특히 게이트 근처에서 섬유배향에 영향을 미치며 수치해석 결과는 벽면 근처에 서 유동방향으로 배향하는 shell층을 과대 예측함을 알수 있었는데 이는 배향 텐서 변화 방 정식의 최종근사에서 기인하는 오차로 판단된다. 수정된 복합최종 근사를 바탕으로 예측된 이방성 기계적 성질이 기존의 복합최종 근사에 기초한 예측보다 실험 결과에 정량적으로 보 다 잘 일치하였다.

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Binding of Iron by Vegetable Fiber (식이섬유의 철분결합력에 관한 in vitro 연구)

  • 계수경
    • Korean journal of food and cookery science
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    • v.13 no.4
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    • pp.472-477
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    • 1997
  • Iron was bound to neutral detergent fiber (NDF) obtained from 15 kinds of vegetables commonly consumed in Korea. Iron binding capacity of NDF ranged from 37.83% to 85.51%, and it increased as the pH increased and reached to the maximum at pH 7 in all vegetables. The amount of Fe bound to NDF increased as the Fe concentration increased.

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Binding of Iron by Vegetable Fiber (한국인 상용야채로부터 추출한 식이섬유의 철분 결합력에 관한 연구)

  • Gye, Su-Gyeong
    • Journal of Applied Tourism Food and Beverage Management and Research
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    • v.17 no.2
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    • pp.95-106
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    • 2006
  • Iron was bound by neutral detergent fiber(NDF) obtained from 15 kinds of vegetables being consumed commonly in Korea. Binding capacity of Fe of NDF ranged from 37.83% to 85.51%. Fe binding capacity of NDF increased as pH increased and reached to a maximum at pH 7 in all vegetables. The amount of Fe bound to NDF increased as Fe concentration increased.

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A Case Report of Restrictive Ventricular Septal Defect & Left Ventricular Out Flow Tract Stenosis Caused by Fibrotic Tissue in Tetralogy of Fallot (섬유성 조직으로 인한 제한적 심실 중격 결손과 좌심실 유출로 협착을 보인 활로씨 4증 1예 보고)

  • Hwang, Ui-Dong;Jung, Sung-Ho;Seo, Dong-Man
    • Journal of Chest Surgery
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    • v.39 no.11 s.268
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    • pp.850-853
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    • 2006
  • The VSD in TOF is usually large and unrestrictive with an equal to or greater than that of the aortic annulus. Typically shunting through the VSD is bidirectional or right-to-left component. Restrictive VSD in TOF caused by ingrowing fibrotic tissue is very rare. We report a case of restrictive VSD and LVOTO in TOF caused by ingrowing fibrotic tissue with the review of literature.

Production of Soluble Dietary Fiber of Buckwheat Hulls by Enzymatic Depolymerzation and its Characteristics (메밀껍질의 효소분해에 의한 수용성 식품섬유소의 생산 및 기능적 특성)

  • Im, Hee Jin;Park, Bo Yeon;Yoon, Kyung Young
    • Korean Journal of Food Science and Technology
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    • v.48 no.2
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    • pp.97-103
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    • 2016
  • This study was conducted for the production of water-soluble dietary fiber (SDF) from buckwheat hulls by using Celluclast or Viscozyme. The functionality of this SDF, including antioxidant activity, glucose- and bile acid-retardation effects in vitro, was measured. SDF yields from cellulose and hemicellulose fractions were 60.5 and 123.7 g/kg dry matter, respectively. Analysis of molecular weight distribution of SDF by using gel chromatography showed that SDF degradation increased with increase in reaction time. The antioxidant activity of SDF obtained by enzymatic hydrolysis was higher than that of dietary fiber without enzyme treatment. SDF showed higher retardation effects on glucose and bile acid than the sample without dietary fiber did. The results of this study suggested that SDF produced from buckwheat hull by enzymatic hydrolysis is a good source of functional food material because of its high antioxidant activity and glucose- and bile acid-retardation effects.

Cystic Fibrous Dysplasia in the Kong Bone (낭종성 섬유성 이형성증)

  • Bahk, Won-Jong;Rhee, Seung-Koo;Kang, Yong-Koo;Lee, An-Hi;Park, Jeong-Mi;Chung, Yang-Guk;Choi, Kwang-Cheon
    • The Journal of the Korean bone and joint tumor society
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    • v.13 no.1
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    • pp.22-30
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    • 2007
  • Purpose: We describe clinical, radiographic, MRI and pathologic findings as well as final outcome after simple curettage and bone graft of cystic fibrous dysplasia (FD) in the long bone, which has been rarely documented in the literature. Materials and Methods: Clinical records, radiographs, MRI and histologic slides of 11 patients with cystic FD in the long bone were retrospectively analyzed. Results: Six patients complained pain for several months, 4 patients presented pain after trivial injury event, and 1 patient suffered pathologic fracture. The mode of involvement was monostotic in 10 patients and polyostotic in l patient. The femur was affected in 7 patients, the humerus in 3, and the radius in 1. Radiography showed prominent, expansive lysis associated with ground-glass density of FD. MRI revealed 2 different signals of FD and cyst. Microscopic examination revealed classic findings of FD and non-specific cystic degeneration. The final outcome was satisfactory in every patient. Local recurrence was not observed. Conclusion: Cystic FD in the long bone seems not as rare as the scarcity of reported cases would indicate. MRI features provide a basis for differential diagnosis between benign cystic change and malignant transformation. Cystic FD would be an indication for surgery and simple curettage with allo-chip-bone graft is effective.

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The effect of steroid for fibrous dysplasia of the humerus combined with multiple cystic lesion (낭종성 병변을 동반한 상완골의 섬유성 골이형성증에서 steroid의 효과 - 증례 보고 -)

  • Hahn, Soo-Bong;Shin, Kyoo-Ho;Kim, Bo-Hyun;Won, Jung-Hoon
    • The Journal of the Korean bone and joint tumor society
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    • v.8 no.1
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    • pp.20-26
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    • 2002
  • Fibrous dysplasia is a benign pathologic condition in which the normal cancellous bone is replaced by the fibro-osseous tissue. It is found mostly in the femur, tibia, skull, rib, and humerus. Clinically it may develops pain, progressive deformity, and pathologic fracture. Curettage with bone graft has been the most popular treatment method thesedays. A 17-year-old female who had fibrous dysplasia of the humerus combined with multiple cystic lesion was treated by intralesional steroid injection into the lesion total 2 times. The follow-up plain X-ray which was taken 11 months after steroid injection reveals decrease in size and increase in bone density and cortex thickness. The follow-up MRI reveals significant decrease in size and signal intensity. The signal intensity was decreased to that of normal bone marrow in T2 weighted image. She complains no pain and lives symptom free in last follow-up at 2 years and 8 months after steroid injection.

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Quality Evaluation of Strawberry Jams Prepared with Refined Dietary Fiber from Ascidian(Halocynthia roretzi) Tunic (우렁쉥이(멍게) 껍질로부터 정제된 섬유소 첨가 기능성 딸기잼의 품질평가)

  • Byun, Myung-Woo;Yook, Hong-Sun;Ahn, Hyun-Joo;Lee, Kyong-Haeng;Lee, Hyun-Ja
    • Korean Journal of Food Science and Technology
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    • v.32 no.5
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    • pp.1068-1072
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    • 2000
  • Strawberry jams were prepared with addition of 1.0 and 2.0% dietary fiber isolated from ascidian (Halocynthia roretzi) tunic for recycling wastes of seafood source and developing new food products. The texture of the jams examined were using a back extrusion rig. All of the rheological parameters decreased in the fiber-enhanced jams. Viscosity profiles were also decreased in the fiber-enhanced jam samples. Hunter L' and a' values increased in the fiber-enhanced jams, accordingly revealing reddish color. As a result of sensory evaluations, the result of taste tests and overall acceptability were significantly acceptable. In the list of acceptability factors, except spreadibility, jam where 1% fiber was added, high sensory scores and preferable acceptability were noted.

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