• Title, Summary, Keyword: 파이버모델

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Simulation of Cracking Behavior Induced by Drying Shrinkage in Fiber Reinforced Concrete Using Irregular Lattice Model (무작위 격자 모델을 이용한 파이버 보강 콘크리트의 건조수축 균열 거동 해석)

  • Kim, Kunhwi;Park, Jong Min;Bolander, John E.;Lim, Yun Mook
    • Journal of The Korean Society of Civil Engineers
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    • v.30 no.4A
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    • pp.353-359
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    • 2010
  • Cementitious matrix based composites are vulnerable to the drying shrinkage crack during the curing process. In this study, the drying shrinkage induced fracture behavior of the fiber reinforced concrete is simulated and the effects of the fiber reinforcement conditions on the fracture characteristics are analysed. The numerical model is composed of conduit elements and rigid-body-spring elements on the identical irregular lattice topology, where the drying shrinkage is presented by the coupling of nonmechanical-mechanical behaviors handled by those respective element types. Semi-discrete fiber elements are applied within the rigid-body-spring network to model the fiber reinforcement. The shrinkage parameters are calibrated through the KS F 2424 free drying shrinkage test simulation and comparison of the time-shrinkage strain curves. Next, the KS F 2595 restrained drying shrinkage test is simulated for various fiber volume fractions and the numerical model is verified by comparison of the crack initiating time with the previous experimental results. In addition, the drying shrinkage cracking phenomenon is analysed with change in the length and the surface shape of the fibers, the measurement of the maximum crack width in the numerical experiment indicates the judgement of the crack controlling effect.

A Study on Seismic Behavior of Space Frame Bridge Using Three-Dimensional Nonlinear Dynamic Analysis (3차원 비선형 동적해석을 이용한 입체라멘교의 지진거동특성에 관한 연구)

  • 김익현
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.5
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    • pp.45-51
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    • 2002
  • The characteristics of nonlinear seismic behavior and failure mechanism of RC space frame in railroad viaducts have been studied by the numerical analysis in time domain. The structure concerned is modeled in 3 dimensional extent and the RC frame elements consisting of fibers are employed for the columns. The fibers are characterized as RC zone and PC one to distinguish the different energy release after cracking resulted from the bond characteristic between concrete and re-bar. Due to the deviation of the mass center and the stiffness center of the entire structure the complex behavior is shown under seismic actions. The excessive shear force is concentrated on the column beside flexible one relatively, which leads to the failure of bridge concerned.

Nonlinear Analytical Model of Unreinforced Masonry Wall using Fiber and Shear Spring Elements (파이버 및 전단 스프링요소를 이용한 비보강 조적벽체의 비선형 해석모델)

  • Hong, Jeong-Mo;Shin, Dong-Hyeon;Kim, Hyung-Joon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.6
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    • pp.283-291
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    • 2018
  • This study intends to develop an analytical model of unreinforced masonry(URM) walls for the nonlinear static analysis which has been generally used to evaluate the seismic performance of a building employing URM walls as seismic force-resisting members. The developed model consists of fiber elements used to capture the flexural behavior of an URM wall and a shear spring element implemented to predict its shear response. This paper first explains the configuration of the proposed model and describes how to determine the modeling parameters of fiber and shear spring elements based on the stress-strain curves obtained from existing experimental results of masonry prisms. The proposed model is then verified throughout the comparison of its nonlinear static analysis results with the experimental results of URM walls carried out by other researchers. The proposed model well captures the maximum strength, the initial stiffness, and their resulting load - displacement curves of the URM walls with reasonable resolution. Also, it is demonstrated that the analysis model is capable of predicting the failure modes of the URM walls.

Equation for handle assessment of cotton and polyester fabrics using nozzle extraction testing method (노즐시험법을 이용한 면/폴리에스터 직물의 촉감 방정식)

  • Yoon, Chang-Hyun;Chun, Dae-Yeop;Hong, Cheol-Jae
    • Science of Emotion and Sensibility
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    • v.14 no.2
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    • pp.191-196
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    • 2011
  • Fabric extraction force measured through nozzle tester reflects a comprehensive fabric handle. Nozzle tester takes advantage of low cost, and simple and fast operating procedure compared with KES system. The paper is to develop the semi-emprical equation for assessment of the fabric handle measured with nozzle tester on the basis of friction law. The variables considered in the equation arc fabric's frictional coefficient and drape coefficient which is determined in terms of fabric bending length and shear strain. The experiment of 12 different cotton and polyester fabrics and comparisons between experimental and theoretical results were conducted. Fabrics of high frictional coefficients, high bending length, and low shear strain showed high fabric handle forces (low handle values). The handle forces predicted from the equation agreed well with those measured, which indicates that the equation can be used to objectively evaluate fabric handle with respect to fabric's own properties and also provide an information for fabric design to improve the handle performance.

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The Effect of Personality Factors of Brand and Advertising Model and Personality Congruence on Brand Equity in Casual Apparel Brands (캐주얼 의류 브랜드에서 브랜드와 광고 모델의 개성요인과 개성 일치성이 브랜드 자산에 미치는 영향 연구)

  • Jeon, Hyeong-Jin;Shin, Sang-Moo
    • Journal of Fashion Business
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    • v.15 no.4
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    • pp.16-27
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    • 2011
  • Consumers fill up not only their needs but also their own identity through apparel product and company. From this point of view, Brand personality is essential to convey customer's personality through advertizing influencing on buying behavior. This study investigates how personality factors of brand and advertising model and personality congruence influenced upon brand equity in casual apparel brands. The research methodology was questionnaire distributed to individuals who used to buy casual apparel brand. A total of 58 returned questionnaires were analyzed by internal validity, factor analysis and regression analysis with SPSS 12.0. The results of this study are as follows: in casual apparel brands, personality factors of brand and advertising model influence on personality congruence. Personality congruence influences on brand recognition and brand loyalty among brand equity.

The Effects of the Virtual Avatar Fitting Models for Apparel e-Commerce in Consumer's Purchasing Behavior: Comparing Traditional Model with Virtual Avatar Model (의류 인터넷 쇼핑몰의 가상 아바타 피팅 모델이 소비자 구매행동에 미치는 영향연구: 기존 온라인 쇼핑몰 모델과 가상 피팅 아바타 모델 비교)

  • Hwang, Suyeon;Shin, Sangmoo
    • Journal of Fashion Business
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    • v.17 no.5
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    • pp.57-69
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    • 2013
  • The purpose of this study is to compare the traditional shopping model and virtual avatar fitting model with regards to credibility and favorable impression effects on shopping mall satisfaction, product preferences, and purchasing intentions of apparel e-commerce. Questionnaires are distributed to 10-30s years old consumers who live in Seoul. Data are analyzed by descriptive statistics, Cronbach's ${\alpha}$, and regression analysis. The results are that the provoked credibility and favorable impression from the traditional shopping model affects the consumers' shopping mall satisfaction and buying intention in descending order. In additional, the credibility from traditional shopping model affects the product preference. The provoked credibility from the virtual fitting model influences the consumers' product preferences, and buying intentions. The favorable impression from the virtual fitting model affects shopping mall satisfaction. In general, provoked credibility from virtual avatar fitting model and traditional shopping model play key roles which could influence the consumers' buying intention.

Nonlinear Failure Analysis of Reinforced Concrete Structures using Fiber Model (파이버모델에 의한 철근콘크리트 구조물의 비선형 파괴해석)

  • 송하원;김일철;변근주
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.127-134
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    • 1998
  • The objectives of this paper is to analyze the reinforced concrete structures by using fiber model. In this study, the fiber modeling techniques including modeling of support conditions are studied. In order to verify the modeling techniques, analysis results obtained for reinforced concrete cantilever beam and reinforced concrete T-girder bridge under cyclic loading are compared with experimental results from full scale test. From the comparison, it is shown that the modeling techniques in this study can be well applied to the nonlinear failure analysis of reinforced concrete structures with porper modifications.

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Similarity Evaluation on Images of Textile Print Design for Digital Library (Digital Library를 위한 텍스타일 프린트 디자인의 이미지 유사성 평가)

  • Lee, Chae-Jung;Kim, Joo-Yong
    • Science of Emotion and Sensibility
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    • v.10 no.4
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    • pp.631-637
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    • 2007
  • This research focuses on similarity evaluation of images according to tones of images. Color space of images were converted RGB color space into HSI color space. The information entropy criteria has been taken for evaluating similarity of images for digital library. The similarity was then calculated by combining correlation coefficients and information entropy. Those two values are further analyzed with a relation to human sensibility.

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Quantification for the Distribution of Hydrogen Bonding Species in Phenolic Model Compounds and Polybenzoxazines (페놀계 모델 화합물 및 폴리벤조옥사진 수지에 대한 수소결합분포의 정량화)

  • Kim, Ho-Dong;Moon, Hwa-Yeon
    • Textile Coloration and Finishing
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    • v.20 no.4
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    • pp.21-30
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    • 2008
  • To understand the complex hydrogen bonding structure, several phenolic derivatives and benzoxazine model compounds are synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR). The estimation of molar extinction coefficients for various types of hydrogen bonding species is systematically carried out by the curve-resolving of FT-IR spectra. The distribution of hydrogen bonding species in benzoxazine model dimers is quantitatively analyzed. It is revealed that benzoxazine dimers and BA-a polybenzoxazine are mainly composed of intramolecular interaction rather than intermolecular interaction.