• Title, Summary, Keyword: Monofilament

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Experimental Study on Mechanical Properties of Monofilament-reinforced Bottom Ash Mixture for Recycling Dredged Soil (준설토를 이용한 단섬유 보강 Bottom Ash 혼합 경량토의 역학적 특성에 관한 실험적 연구)

  • Kim, Yun-Tae;Han, Woo-Jong
    • Journal of the Korean Geotechnical Society
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    • v.24 no.1
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    • pp.101-110
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    • 2008
  • This paper investigates the mechanical characteristics of monofilament-reinforced bottom ash mixtures for recycling dredged soil. Reinforced bottom ash mixture is a lightweight soil added with monofilament in order to increase its shear strength. Test specimens were fabricated by various mixing conditions including monofilament content, its length and its diameter. Then several series of unconfined compression tests and direct shear tests were performed to investigate mechanical characteristics of reinforced lightweight soil. The experimental results indicated that stress-strain behaviors of reinforced lightweight soil were strongly influenced by mixing conditions of monofilament content, its length and diameter. The compressive strength of reinforced lightweight soil generally increased by adding monofilament. In this test, the maximum increase in compressive strength was obtained at 0.5% content and 4cm length of monofilament. These results were similar to those of direct shear tests. The unconfined compressive strength of reinforced lightweight soil with monofilament of 0.25mm in diameter was greater than that of reinforced lightweight soil with monofilament of 0.5mm in diameter.

ON THE CATCH OF GILL NET IN THE JEJU ISLAND -Comparison of mackerel catch in monofilament and multifilament gill nets- (제주도 자망이망율에 관하여 -고등어 자망의 이망율 비교-)

  • SHON Tae Jun
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.8 no.1
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    • pp.7-10
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    • 1975
  • The catches of mackerel by monofilament and multifilament net were compared by means of $x^2$ and t-test method. In order to improve the netting twine of drift nets, 6 shoots 5 different mesh and nylon-monofilament netting twines $(B\times2,\;C\;D,\;F,)$ and 2 shoe nylon-multifilament $(A\times2)$ which are using near the Jeju Island in contemporary days were used for the experiment. These gill no were connected in order of A, ,B, C, A, B, E, F and operated fly fishing boat Taeann Ho (7T) near sea of Jeju Ialand from May 1974 to August 1974. The results obtained are as follows: 1. B type nylon-monofilament gill nets were superior to nylon-multifilament gill nets in catch according to the result of $X^2$ test and t-test, and the catch ratio was $M_A:\;M_B=1:1.8$. 2. 75mm mesh size C, D nylon-monofilament gill nets were superior to 85mm mesh size nylonmonofilament gill nets, and their catch ratio were E, F: C, D=1:2.8. 3. The catch ratio C, D and E, F type nets were compared by means of t-teat, however could not recognized their relationship.

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Weatherability of biodegradable polybutylene succinate(PBS) monofilaments (생분해성 PBS monofilament의 내후성)

  • Park, Seong-Wook;Bae, Jae-Hyun
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.44 no.4
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    • pp.265-272
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    • 2008
  • Biodegradable polybutylene succinate(PBS) is an environment friendly plastics for fisheries, because it can mitigate the ghost fishing problem caused by gill-net and trap fisheries. To evaluate photodegradability of PBS monofilament in comparison with polyamide(PA) and polyethylene(PE) monofilament, these 3 types of monofilaments were spun and exposed to ultraviolet light(UV) of weather-ometer for 900 hours, and then their modification, crystal structure, strength, and extensibility were analysed. PBS monofilament did not show any crack and maintained its crystal structure after 900 hour exposure to UV whereas PE monofilament began showing cracks and structure modification after 600 hour exposure. Under UV exposure, the strength and extensibility decreased more rapidly in PBS than in PA and PE. We estimate that gill nets made of PBS monofilament can endure for about 1 year. The breaking strength and elongation decreased linearly with the exposure time for the 3 types of monofilaments. The derived regression equations of the residual tenacity(RT, kg/$mm^2$) and the residual extensibility(RE, %) with the exposure time in year(Y) for each monofilament were; PBS : RT=48.598 - 8.6437Y($R^2=0.93$), RE=28.165 - 7.3233Y($R^2=0.98$), P A : RT=59.771 - 8.6437Y($R^2=0.98$), RE=32.198 - 5.2772Y($R^2=0.92$), P E : RT=60.898 - 5.6528Y($R^2=0.98$), RE=11.887 - 0.7188Y($R^2=0.98$).

Shear Strength Properties of Fiber Mixed Soil (섬유혼합토의 전단강도 특성)

  • Cha, Hyun-Ju;Choi, Jae-Won;Lee, Sang-Ho
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.44 no.4
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    • pp.123-128
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    • 2002
  • This study was performed to use fiber mixed soil which has clayey soil or sandy soil with fibrillated fiber or monofilament fiber on purpose of construction materials, filling materials, and back filling materials. In addition, this study was conducted to analyze strength properties and fiber reinforcing effect with fiber mixed soil by direct-shear test. In case of fibrillated fiber mixed soil, the more quantity of fiber was in both cohesive soil and sandy soil, the larger shear stress was in respective step of normal load. The respective mixed soil at 0.5% and 0.1% mixing ratio of monofilament fiber mixed soil showed maximum shear stress. According to unconfined compression or direct-shear test, making specimen of the monofilament fiber mixed soil, it is required to be careful and stable mixing method, while it is expected that monofilament fiber mixed soil doesn't increase strength.

Application of Weifull강s Theory to Evaluation of Strength for Ceramic Fibers (Ceramic 섬유의 강도 평가에 대한 Weibll 이론의 적용)

  • 이지환;김현수;한상훈
    • Journal of the Korean Ceramic Society
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    • v.27 no.8
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    • pp.1043-1049
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    • 1990
  • In this work, strength of ceramic fibers and monofilament composites were evaluated on the basis of Weibull's theory. The fibers used were β-SiC and γ-Al2O3 monofilament composites was fabricated by coating Al on the fiber surface by the use of vacuum evaporation method. Average tensile strength of ceramic fibers showed the tendency to linearly decrease with increasing gauge length. Also, Weibull moduli of ceramic fibers were decreased with increasing gauge length, Weibull modulus of β-SiC was 3.5 for 6-50mm, 2.8 for 100-200mm. Weibull modulus of γ-Al2O3 was 6.5 for 20-50mm, 6 for 100mm. Fibers in monofilament retained their original as-produced strength to exposure temperature of 400℃. However, tensile strength of both monofilament composites approved to remarkably degrade due to interfacial reaction-induced flaws on the fiber surface after thermal exposure of 600℃. In this case, Weibull modulus of monofilament composites was 2.7 for β-SiC and 5.2 for γ-Al2O3 respectively.

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In-vitro and in-vivo Behaviors of Poly(glycolide-caprolactone) Copolymer for Bioabsorbable Suture Materials

  • Yoo, Yeon-Chun;Kim, Hak-Yong;Jin, Fan-Long;Park, Soo-Jin
    • Bulletin of the Korean Chemical Society
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    • v.33 no.12
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    • pp.4137-4140
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    • 2012
  • A novel bioabsorbable suture material, poly(glycolide-caprolactone) (PGLCL) monofilament, was prepared by spinning of the PGLCL copolymer. The physical properties, strength retention, biocompatibility, and organism resolvability of the PGLCL monofilament were investigated. The results showed that the knot pull strength of the monofilament was higher than that stated in European Pharmacopoeia. The in vivo retention strength following implantation was 64%, 23%, 7%, and 0% after one, two, three, and four weeks, respectively. Mortality, clinical signs, validation, and sterility tests indicated that all items had passed. Organism resolvability tests showed that the PGLCL monofilament, as a suture, was absorbed within 91 days.

The Durability of Polybutylene Succinate Monofilament for Fishing Net Twines by Outdoor Exposure Test (옥외 노출시험에 의한 PBS 단일섬유 망사의 내구성 변화)

  • Park, Seong-Wook;Kim, Seong-Hun;Lim, Ji-Hyun;Choi, Hea-Sun
    • Journal of Fisheries and Marine Sciences Education
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    • v.25 no.4
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    • pp.766-774
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    • 2013
  • Biodegradable polybutylene succinate(PBS) is a kind of environmentally friendly plastics for fisheries, because it can mitigate the ghost fishing problem caused by gill-net and trap fisheries. To evaluate durability of PBS monofilament, each of different diameter 3 types of monofilaments were spun and exposed to 56 month outdoor and then their gravity, modification of surface, breaking strength, and elongation were analysed. The gravity of PBS monofilament was estimated to be approximately 1.24 when spinning ratio from 4.8 to 6.1. PBS monofilaments did not show any crack after 56 month exposed to outdoor and load-elastic elongation curve was showed sigmoid type. Decreasing ratio of elongation was appeared in the thinnest monofilament 0.2mm diameter and breaking strength was in the thickest monofilament 0.4mm diameter. Breaking strength and elongation at break were decreased rapidly after 48 month exposed to outdoor. Breaking strength reduced linearly after 48 month exposure, while no such linear relationship was found in the case of elongation at break. In results, it was investigated that the durability of PBS monofilament nets for gillnet and trap were 24, 50 month when keep to land, respectively.

Physical Properties of Poly(p-dioxanone)(PPDO) and In vitro Degradation Behavior of Monofilament Suture (Poly(p-dioxanone)(PPDO)의 물리적 특성과 모노필라멘트 봉합사의 In vitro 가수분해 특성)

  • Lee, June-Hee;Ko, Suk-Yen;Koh, Young-Joo;Shin, Jae-Sup;Chung, Yong-Seog;Kwon, Soo-Han
    • Textile Science and Engineering
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    • v.47 no.4
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    • pp.279-290
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    • 2010
  • The bulk polymerization and thermal properties of biodegradable poly(1,4-dioxan-2-one)[poly(p-dioxanone), PPDO] were investigated. The in vitro hydrolytic degradation behavior of PPDO monofilament sutures were also examined over a 16 week period at $37^{\circ}C$ and $45^{\circ}C$. The degree of PPDO polymerization decreased with increasing content of the initiator, lauryl alcohol[$CH_3(CH_2)_{11}OH$]. The thermal stability of PPDO was inversely proportional to the content of the catalyst, Sn(II) ethylhexanoate[$Sn(Oct)_2$]. Considering the efficiency of polymerization and the thermal stability of PPDO, the proper contents of Lauryl alcohol as an initiator and ethylhexanoate as a catalyst were 1600~1900 ppm and 20~30 ppm, respectively. Based on the determination of the half crystallization time, the crystallization speeds of dyed PPDO chip and monofilament suture were higher than those of undyed PPDO chip and monofilament suture. The maximum rates of crystallization of the dyed and undyed samples were observed at around $40{\sim}50^{\circ}C$ and $50{\sim}60^{\circ}C$, respectively. At the beginning of the in vitro time, the tensile strength of the PPDO monofilament suture decreased slowly but decreased considerably after a certain period, indicating that the degradation proceeded in two steps, the first occurring in the amorphous regions and the second in the crystalline regions. The average molecular weight of the PPDO monofilament suture decreased continuously from the beginning of the in vitro time, due to the random nature of the degradation process. The breaking strength retention (BSR) and molecular weight of the PPDO monofilament suture showed a quadratic function relationship.

Comparison of Mechanical Characteristics of Fiber-Reinforced Lightweight Soils (섬유보강 혼합경량토의 역학적 특성 비교)

  • Kim, Yun-Tae;Han, Woo-Jong
    • Journal of Ocean Engineering and Technology
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    • v.22 no.4
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    • pp.51-58
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    • 2008
  • The objective of this study was to investigate the mechanical characteristics of fiber-reinforced lightweight soil using waste fishing net or monofilament for recycling both dredged soils and bottom ash. Reinforced lightweight soil consists of dredged soil, cement, air foam, and bottom ash. Waste fishing net or monoiament was added the mixture in order to increase the shear strength of the lightweight soil. Test specimens were fabricated with various mixing conditions, including waste fishing net content and monofilament content. Several series of unconfined compression tests and direct shear tests were carried out. From the experimental results, it was found that the unconfined compressive strength, as well as the stress-strain behavior of reinforced lightweight soil was strongly influenced by mixing conditions. In this study, the maximum increase in shear strength was obtained with either a 0.5% content of monofilament or 0.25% waste fishing net. The unconfined compressive strength of reinforced lightweight soil with monofilament was greater than that of reinforced lightweight soil with waste fishing net.

Image Analysis of the Micro-sectors of the Monofilament Mesh-type Fabric and Modeling Using Photon Mapping (메쉬상 모노필라멘트 직물의 미소면에 대한 화상분석과 포톤매핑)

  • 김종준
    • Textile Science and Engineering
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    • v.39 no.6
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    • pp.706-713
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    • 2002
  • With the introduction of the image analysis techniques, various applications have been developed in the textile and clothing research area. The shape and construction of the individual fibers that comprise a polymeric yarn bundle have a strong influence on the fabric appearance properties. One of these properties is the fabric luster. Due to the fact that textile fabrics have immense diversify in texture or appearance, it is reasonable to observe the fabric optical properties, including the luster, with changing incident illumination at micro-sectors of the specimen. Together with the measurement using a CCD camera, 3-dimensional simulated models of a cylindrical monofilament and a mesh-type monofilament fabric were rendered using photon mapping. The change in the illumination condition was found to have a strong e(feet on the observed luster of the mesh type filament fabric specimen.