• Title/Summary/Keyword: wrinkle structure

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A Study on the Hemisphere-Type Compression Molding for Continous Fiber-Reinforced Polymeric Composites (연속섬유강화 플라스틱 복합재료의 반구형 압축성형성에 관한 연구)

  • 임용진;오영준;김이곤
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 1999.11a
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    • pp.149-153
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    • 1999
  • During a hemisphere-type compression molding, the wrinkles are caused by complex stress condition. It is very important to clarify the degree of wrinkles in order to have good products. In this paper, the effects of numbers of needling and initial area on the degree of wrinkles are studied. the degree of wrinkle is expressed as nonhomogeneity.

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Fine Structure and Physical Properties of Cotton Fibers and their Fabrics Treated with Liquid Ammonia, NaOH, and NaOH/Liquid Ammonia (액체암모니아, 수산화나트륨, 수산화나트륨/액체암모니아 처리한 면의 미세구조 및 물성)

  • 배소영;이문철;김홍성;이영희;김경환
    • Textile Coloration and Finishing
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    • v.6 no.2
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    • pp.47-54
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    • 1994
  • Cotton fiber, NaOH-mercerized cotton fiber, cotton fabric, and NaOH-mercerized cotton fabric have been treated by liquid ammonia at -33.4$^{\circ}C$. The fine structures, bending properties, tensile strengthes, shrinkages for laundering, and wrinkle recoveries were studied. The treatment of cottons with liquid ammonia brought about the transition of crystal lattice ; transforming cellulose I crystal of original cotton to cellulose I and III crystal, and cellulose II crystal of mercerized cotton to cellulose II and III crystals. The degree of crystallinities were decreased in the order of liquid ammonia>NaOH/liquid ammonia>NaOH-treated cotton. However moisture regain and water absorbency for liquid ammonia-treated cotton were lower than that of NaOH-treated cotton because of a difference in swelling actions of the agents. It seems caused by intermicrofibrillar pores produced in swelling processes. The bending rigidity and bending hysteresis were decreased remarkly by liquid ammonia treatment. Therefore softness and dimensional stability were improved. The liquid amminia and NaOH/liquid ammonia-treated cottons moreover show excellent properties in tensile strength, anti-shrinkage for laundering, and wrinkle recovery.

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Effect of Wrinkling on Failure Behavior of Thin Membranes (얇은 막재에서 주름이 파괴거동에 미치는 영향)

  • Kim, Young-Ah;Woo, Kyeong-Sik
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.11
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    • pp.1005-1012
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    • 2011
  • In this paper, the effect of wrinkling on the failure behavior of thin membrane was studied using geometrically nonlinear shell element post-buckling analysis with global-local analysis strategy. In the analysis, double-edge notched and single-edge notched tensile specimen configurations were considered. The analyses were performed for both cases with allowing and suppressing the wrinkling deformation. The results were investigated focusing on the effect of wrinkle development on the variation of J-integral values at the cut tip. The effect of cut lengths and the specimen lengths were also systematically studied.

A Study on the Analysis of Causes & Minimizing of Defects at Composite Materials Sandwich Aircraft Structure in Autoclave Processing (항공기용 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안)

  • 권순철;임철문;최병근;이세원;한중원;김윤해
    • Composites Research
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    • v.14 no.1
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    • pp.22-29
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    • 2001
  • The purpose of this paper is to determine the effect of the autoclave inner pressure rate, heat-up rate, tool round angle, Thickness of core, height of joggle on defects, and to minimize the defects of aircraft sandwich structure reinforced with honeycomb core occurred in autoclave processing. The results showed that the geometry of aircraft sandwich structure and tool such as tool round angle, thickness of core, height of joggle, and the autoclave cure conditions such as inner pressure rate, heat up rate strongly affected the core movement, core wrinkle, bridge phenomenon of prepreg and depression of core that occurred in autoclave processing.

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The Evaluation of Anti-wrinkle Effects in Oriental Herb Extract (한방 원료 추출물의 주름개선 효과를 통한 화장품 원료로서의 가치 평가)

  • Kang, Kum-Suk;Kim, In-Deok;Kwon, Ryun-Hee;Heo, Ye-Young;Oh, Sang-Hoon;Kim, Min-Ah;Jung, Hye-Jin;Kang, Hwan-Yul;Ha, Bae-Jin
    • Journal of Life Science
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    • v.17 no.8 s.88
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    • pp.1147-1151
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    • 2007
  • The human skin is constantly exposed to environmental irritants such as ultraviolet, smoke and chemicals. Free radicals and reactive oxygen species caused by them play critical roles in cellular damage. They not only injure the skin structure but also participate in the immensely complex inflammatory reaction. Anti-wrinkle effects of the Oriental herb extracts(OHE) were evaluated by the determination of anti-oxidation, collagenase inhibition and collagen synthesis in normal human fibroblast. OHE showed antioxidative activity as high as vitamin C, trolox and DL-penicillamine. Also OHE showed promotive effect on collagen synthesis and inhibitory effect on collagenase activity. These results demonstrated that OHE could be useful as an anti-wrinkle cosmetic ingredient.

Isolation of Stenotrophomonas rhizopilae Strain GFC09 with Ginsenoside Converting Activity and Anti-wrinkle Effects of Converted Ginsenosides (사포닌 전환 활성 Stenotrophomonas rhizopilae Strain GFC09 균주의 분리 동정 및 전환 사포닌의 주름 개선 효과)

  • Min, Jin Woo;Kim, Hye-Jin;Joo, Kwang-Sik;Kang, Hee-Cheol
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.41 no.4
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    • pp.375-382
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    • 2015
  • Ginsenosides (ginseng saponin) as the one of important pharmaceutical compounds of ginseng and is responsible for the pharmacological and biological activities. These ginsenoside produces diverse small molecules ginsenoside which have more pharmacological activities including anti-wrinkle, anti-cancer and anti-oxidant effects. In the present study, we isolated bacteria using esculin agar, to produce ${\beta}$-glucosidase, and we focused on the bio-transformation of ginsenoside. Phylogenetic tree analysis was performed by comparing the 16S rRNA sequences; we identified the strain as Stenotrophomonas rhizopilae strain GFC09. In order to determine the optimal conditions for enzyme activity, the crude enzyme was incubated with 1 mM ginsenoside $Rb_1$. Bioconversion of ginsenoside $Rb_1$ were analyzed using TLC and HPLC. The crude enzyme hydrolyzed the ginsenoside $Rb_1$ along the following pathway: LB: $Rb_1{\rightarrow}Rd{\rightarrow}F_2$ into compound K, TSB: $Rb_1{\rightarrow}Rd{\rightarrow}F_2$. The structure of the hydrolyzed metabolites were identified by NMR. The activity screening tests showed that the conversion product induced the production of type I procollagen in a dose-dependent manner. These results suggested that hydrolyzed ginseng product containing the ginsenoside $F_2$ and compound K could be useful as an active ingredient for wrinkle-care cosmetics.

Effects of Magnolia Officinalis Bark Extract on Improvement of Lip Wrinkles (요엽후박나무 추출물의 입술 주름 개선에 대한 연구)

  • Lee, Seonju;Kim, Mina;Park, Sung Bum;Kim, Ki Young;Park, Sun-Gyoo;Kim, Mi-Sun;Kang, Nae-Gyu
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.45 no.1
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    • pp.95-103
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    • 2019
  • Lips have a defect in maintenance of moisture due to their thin layer. As aging progresses, lips lose volume and redness, and become wrinkled. Fat grafting and filler surgery have been used to achieve attractive lips, but little research has been reported to develop better materials to replace the present methods. Recently, a study suggests that the increase of adipocyte number can be enhancing the expansion endogenous fat. In previous study, we identified that the efficacy of Magnolia officinalis bark extract (MOBE) was effective on the induction of adipogenic differentiation. In this study, we confirmed that MOBE enhanced the differentiation of human adipose-derived stem cells on the fat mimic 3D structure built by 3D bioprinting method From further experiments in human, we established a method to quantify the severity of lip wrinkle by measurement of standard deviation of gray value using Image J software. Finally, we found that topical treatment with 1% MOBE formulated lip balm significantly improved the lip wrinkle after using for 12 weeks. In conclusion, these findings suggest that MOBE has great potential, as a cosmetic ingredient, to reduce the lip wrinkle through the effect of promoting adipogenic differentiation.

Modification of Tencel Fabric Treated with Chitosan ( I ) - Change of Physical Properties - (키토산처리에 의한 텐셀 직물의 개질기능화(I) - 물성 변화를 중심으로 -)

  • 배현숙;육은영
    • Textile Coloration and Finishing
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    • v.14 no.1
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    • pp.18-26
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    • 2002
  • Chitosan has reactive amino and hydroxyl groups which can be used to chemically alter its properties under the mild reaction conditions. Thus the cationization of Tencel with Chitosan is effective to modify the fabric. To investigate the modified properties of Tencel fabric, the tests were performed under the several finishing process with enzyme/glutaraldehyde/softener. The internal structure of Tencel which has the structure of cellulose II wasn't changed by enzyme, chitosan and crosslinking agent treatment and the thermal stability was improved by chitosan and crosslinking agent treatment. Wrinkle recovery angle under the dry condition increased highly until $0.1\textrm{mol}/\ell$ of glutaraldehyde concentration, and then decreased. Tensile strength of modified Tencel fabric decreased with increasing of weight loss, but it was improved more or less by chitosan, crosslinking agent and softener. Moisture regain was improved by enzyme and chitosan treatment. And antibacterial activity showed nearly 100% on Tencel fabric treated with 0.5% chitosan and adsorption of metal ion increased with increasing of chitosan concentration.

Physical Properties and Dyeing Behaviors of Cellulosic Fabrics Treated with Liquid Ammonia (액체암모니아 처리한 셀룰로오스계 직물의 물성 및 염색성)

  • 배소영;이문철;김경환;일본명
    • Textile Coloration and Finishing
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    • v.7 no.1
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    • pp.10-22
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    • 1995
  • Cellulosic fabrics, i.e. rayon, polynosic, and linen were treated with liquid ammonia at -33.4$^{\circ}C$. The fine structures, bending properties, tensile strength, wrinkle recoveries, and dyeing properties of the treated fabrics were studied. Dyeing was carried out with two direct dyes, C. I. Direct Red 2 and Blue 1. The liquid ammonia treatment for three fabrics brought about the transition of crystal lattices and the decrease of crystallinity; transforming cellulose I structure of original linen to cellulose I and III structure, and cellulose II structure of original rayon and polynosic to cellulose II and III structure. Moisture regain of liquid ammonia- treated polynosic and linen was higher than that for untreated, and water absorbency of liquid ammonia-traeated fabrics was all lower than that of untreated. Also, bending properties of treated fabrics were not improved compared with those of untreated ones. The rayon treated with liquid ammonia was increased not only the apparent diffusion coefficient and the rate of dyeing but also equilibrium dye adsortion, whereas polynosic and linen were increased only equilibrium dye adsortion. It is suggested that the pore sizes of liquid ammonia-treated rayon, polynosic, and linen are much smaller than that of liquid ammonia-treated cotton.

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Large Area Deposition of Biomimetic Polydopamine-Graphene Oxide Hybrids using Langmuir-Schaefer Technique (랭뮤어-쉐퍼 기법 이용 생체모사 폴리도파민-산화그래핀 복합체 대면적 적층 기법 연구)

  • Kim, Tae-Ho;Song, Seok Hyun;Jo, Kyung-Il;Koo, Jaseung
    • Journal of Adhesion and Interface
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    • v.20 no.3
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    • pp.110-115
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    • 2019
  • Graphene oxide has been gathering interests as a way to exfoliate graphene. Since the oxidation group of graphene oxide can hydrogen bond with various functional groups, tremendous efforts have been actively conducted to apply various applications. However, graphene oxide alone cannot substantially possess the mechanical properties required for the practical application. Therefore, in this study, polydopamine, which is a bio-mimetic mussel protein-inspired material, was combined with graphene oxide to form a large-area composite membrane at the liquid-gas interface. In addition, the morphology of the polydopamine-graphene oxide composite thin film was also controlled to obtain a composite membrane having a nano-wrinkle structure. It can be expected to be used in the next generation seawater desalination membranes or carbon composites because it can form mechanically superior and sophisticated nanostructures.