• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.05a
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• pp.1-4
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• 2003

본 연구는 경편성물의 특성에 영향을 미치는 중요한 구조변수인 조직, 편환의 계폐여부, 가이드바의 상호 움직임 방향에 따른 소리특성과 생리적 반응 사이의 관계를 파악함으로써 총합적 감성소재 설계를 위한 기초 자료를 제공하고자 하였다. 직물소리발생장치를 이용하여 7가지의 경편성물에 대한 마찰음을 녹음한 후, 이를 마찰음이 유발하는 생리반응을 측정하여 slow alpha파, fast beta파, ECG R-R, RESP, HF/LF, SCL, PV등을 분석하였다. 조직에 따라서는 LPT, Loundness(Z), Roughness(Z)와 Fluctuation strength(Z) 가장 큰 Sharkskin에서 fast beta파, ECG R-R, RESP는 증가하였으며 slow alpha파, PV, HF/LF는 감소하였다. 편환의 개폐여부에서는 폐환보다는 개환에서 Loudness(Z), Sharpness(Z), Fluctuation strength(Z)가 증가하였으며 RESP는 증가하고 HF/LF는 감소하여 개환이 더 불쾌한 감성을 유발하였다. 가이드바의 상호 움직임 방향은 counter보다는 parallel에서 slow alpha의 변화량이 감소하고 fast beta의 변화량이 증가하여 counter보다는 parallel이 더 불쾌한 감성을 유발하는 것으로 보인다. 또한 편성물의 음향특성 중 ΔL, Δf 와 Roughness(Z), Fluctuation Strength(Z)가 생리반응을 예측하는 중요한 요인으로써 나타났다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.11
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• pp.1757-1764
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• 1997

The geometric and elastic models based on the unit cell have been proposed to predict the geometric characteristics and the engineering constants of plain and satin woven composites. In the geometric model, length and inclined angle of the yarn crimp and the fiber volume fraction of woven composites have been predicted. In the elastic model, the coordinate transformation has been utilized to transform the elastic constants of the yarn crimp to those of woven composites, and the effective elastic constants have been determined from the volume averaging of the constituent materials. Good correlations between the model predictions and the experimental results of carbon/epoxy and glass/epoxy woven composites have been observed. Based on the model, the effect of various geometric parameters and materials on the three-dimensional elastic properties of woven composites can be identified.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.211-214
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• 2013

프로그래밍 교육은 프로그래밍 언어 습득과 원리 이해, 활용뿐만 아니라 학생들의 고등사고 능력 향상 측면에서 정보 교육의 중요한 영역이라 할 수 있다. 하지만 일반적인 텍스트 형태의 프로그래밍 언어는 초 중등학교 학생들이 익히기 쉽지 않은 문법과 구조를 가지고 있어, 학생들이 보다 쉽고 재미있게 프로그래밍 언어를 학습할 수 있는 도구와 방안이 필요하다. e-textile은 프로그래밍 가능한 마이크로 컨트롤러 보드와 센서 등을 직물에 연결하여 다양한 작품을 만드는 것으로 프로그래밍 학습에 대한 학생들의 호기심과 관심을 불러일으킬 수 있다. 따라서 본 연구에서는 e-textile을 활용하여 학생들의 프로그래밍 학습에 대한 동기 유발 방안을 모색하고자 하였으며, 이를 위해 Keller의 ARCS 모델의 동기 유발 전략을 바탕으로 프로그래밍 수업을 위한 교수 설계를 하였다.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2003.10a
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• pp.234-237
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• 2003

The absorption and the interference shielding of the electromagnetic wave problem have been a very important issue for commercial and military purposes. This study dealt with the simulation reflection loss for electromagnetic absorbing sandwich type structures in X-band(8.2Ghz~12.4GHz). Glass/epoxy composites containing conductive carbon blacks were used for the face sheets and styrofoams were used for the core. Their permittivities in X-band were measured using the transmission line technique. Simulation results of 3-1ayered sandwich type structures showed the reflection loss using the theory about transmission and reflection in a multi-layered medium.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.557-563
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• 2010

Mode II interlaminar fracture toughness was measured and fractured surfaces were observed of carbon/epoxy and glass/epoxy woven fabric composites for carbody structure. Woven fabric carbon/epoxy and glass/epoxy composites that made with prepreg and epoxy resin(RS1222) are used in carbody structure of Korean tilting train(TTX) and low floor bus. ENF(End Notched Flexure) specimens having $120mm{\times}20m{\times}5mm$ shape and 35mm initial crack were made with each composites and three point bending tests according to ASTM D790 were conducted for these specimens. Crack lengths in tests were recorded using optical microscope and digital camcorder. NL(Non Linear), 5% offset and Max. load points in load -displacement curves were checked and mode II interlaminar fracture toughness of these points were calculated and compared. Fractured surfaces of specimens were observed using optical microscope and mode II delamination behavior of each composites was discussed.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2004.04a
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• pp.169-172
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• 2004

We fabricated MWNT-added glass fabric/epoxy composites. We observed the distribution of MWNTs in the composites using scanning electron microscopy and conformed that most of MWNTs exist in matrix rich region and interface between yams in warp and fill directions. We also investigated the change of permittivities with MWNT concentrations. Only $1wt\%$ MWNTs leads to high permittivity and electromagnetic waves are impossible to be transmitted to more than $3wt\%$ MWNT-added composites, which means the characteristics of these composites are comparable to those of metals or carbon fiber-reinforced composites.

• Proceedings of the CALSEC Conference
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• 1999.07a
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• pp.327-333
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• 1999

섬유산업의 환경이 과거의 공급자 중심의 생산, 유통체제(Product out)에서 소비자 중심의 체제(Market In)로 바꾸면서 소비자의 의식과 입장에 서서 상품을 생산하고 유통하는 것을 요구하고 있다. 이러한 요구는 눈부시게 발전하는 정보통신기술을 이용하여 혁신적인 생산 유통의 Innivation인 Quick Response체제를 등장케하는 배경이 되었다. QR은 생산, 유통관계의 거래당사자가 협력하여 소비자에 대하여 Right Product, Right Pla ce, Right Price, Right Time, Right Quantity를 실현하는 것을 목표로 표준상품코드와 ED I, CALS표준등의 요소를 갖춰 기업간, 기업과 소비자가 전자거래(EC)를 실현하여 생산, 유통의 합리화를 이룸으로 그 성과를 생산자, 유통관계자, 소비자가 서로 분배하는 것이다. 또 광역의 정보네트워크를 이용하여 원부자재 업계부터 소매업계까지 유기적으로 통합, 정보의 공유화, 신속화를 꾀함으로서 부가가치를 창출해 내는 것이다. 이같은 산업체간의 정보 공동이용시스템 구축은 대기업과 중소기업의 협력사업이 가능할 뿐만 아니라, 섬유의류산업의 고질적인 병폐로 지적되어온 제품의 리드타임을 해결하는 획기적인 전환점이 될 수 있다. 따라서 섬유산업의 원부자재부터 원사, 직물, 어패럴, 유통에 이르는 전과정을 통일된 표준을 도입하여 전업계가 공동 사용케하고, 그것을 정보시스템과 접목, 전자거래를 실현하기 위한 방안을 제시함.

• Journal of the Korean Home Economics Association
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• v.49 no.1
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• pp.121-133
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• 2011

This research was designed to compare the subjective evaluation of texture image and preference between offline and online by structural characteristics of women' jacket fabrics for spring and summer. 78 participants evaluated the sensibility image and preference of various fabrics. The data were analysed by factor analysis, t-test, Pearson's productive correlation, regression, and multi dimensional scale. The results were as follows: Sensibility image factors of women' jacket fabrics were 'classic' 'sophisticated' 'natural' 'characteristic' and 'practical'. Between offline and online, sensibility images showed no differences. In sensibility images, 'classic'-'sophisticated', 'natural'-'practical', and 'practical'-'characteristic' images showed significant correlation. By analyzing the contribution of fabric structure on sensibility images, density affected on the 'classic' image offline and online. By the results of regression analysis, thickness, density and weave affected on the tactile preference. In sensibility images, 'classic', 'sophisticated' 'characteristic' images were the influencing factor. 'Sophisticated', 'natural', 'characteristic' and 'practical' images affected on the purchase preference.

• Composites Research
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• v.24 no.3
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• pp.6-11
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• 2011

This paper presents an estimating method for local property changes and failure prediction of composite materials experiencing large shear deformation during draping process. The bone plate for the metaphyseal femur fracture was chosen to apply the presented method because it has complex geometry. The local property changes due to macro-/microscopic deformations of fabric composites during draping process were evaluated by various tests and the result was applied to predict static/fatigue behaviors of the bone plate. This paper was expected to present useful information on the design of composite structures with complex geometry and their performance evaluation.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.1
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• pp.35-40
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• 2019

The objective of this paper is to identify the fatigue properties of carbon-fiber composite which is widely applied for the development of aircraft structures and obtain data for full-scale fatigue test. The durability and damage tolerance evaluation of composite structures is achieved by fatigue tests and parameters such as fatigue life factor and load enhancement factor. The specimens are made with carbon-fiber/epoxy UD tape and fabric prepreg. Fatigue tests are performed with several stress ratios and lay-up patterns. The Weibull shape parameters are analyzed by Sendeckyj model and individual fatigue lives with Weibull distribution. And the fatigue life factor and load enhancement factor considering reliability are evaluated.