• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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• pp.139-142
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• 2002

Recently, GFRP is well known as a structural material for the radome of aircraft. In this paper, we have observed the reflectivity of electromagnetic waves on GFRP reinforced with $\textrm{Al}_2\textrm{O}_3$ woven fabric. The result of the experiment has revealed that the reflectivity of $\textrm{Al}_2\textrm{O}_3$/GFRP composites is remarkably reduced compared with that of GFRP. And it also shows that the electromagnetic wave reflections are greatly influenced by the number of $\textrm{Al}_2\textrm{O}_3$ plies in a specific frequency band. These results are expected to be utilized for the technique of manufacturing a low-reflectivity composite structure.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제38차 학술발표대회
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• pp.46-48
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• 2008

Fabrics shrinkage are affected by weaving conditions and are very difficult to be estimated when the amount of fiber consumption and production are calculated. Therefore, we need to standardize fabric shrinkage according to various weaving conditions. To develop the new textile products, we collected and analysed data of fabric shrinkage with the weaving conditions including fabric density and woven structure, tension, and machinery used.

• International journal of advanced smart convergence
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• 제9권3호
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• pp.253-259
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• 2020

Most of today's large-scale cloud systems and enterprise data centers are distributing resources to improve scalability and resource utilization. NVMe-over-Fabric protocol allows submitting NVMe commands to a remote NVMe SSD through RDMA (Remote Direct Memory Access) network. It is attracting attention recently because it is possible to construct a disaggregation storage system with low latency through the protocol. However, the current I/O stack of NVMe-over-Fabric has an inefficient structure for maintaining compatibility with the traditional I/O stack. Therefore, in this paper, we propose a new mechanism to reduce I/O latency and CPU overhead by modifying I/O path of NVMe-over-Fabric to pass through legacy block layer. According to the performance evaluation results, the proposed mechanism is able to reduce the I/O latency and CPU overhead by up to 22% and 24% compared to the existing NVMe-over-Fabrics protocol, respectively.

• Journal of information and communication convergence engineering
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• 제5권1호
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• pp.23-28
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• 2007

In this paper, we propose ATM switch structure including AAL type 2 switch which can efficiently transmit low-bit rate data, even if the network has many endpoints. We simulate the architecture of ATM switch fabric that is modeled in computer program and analyze the performance according to offered loads. ATM switch proposed in this paper can support cell switching for all types of AAL cells which consist of AAL type 1, AAL type 2, AAL type 3/4, and AAL type 5 cells. We propose two switch fabric methods; One supports the AAL type 2 cell processing per input port, the other global AAL type 2 cell processing for every input port. The simulation results show that the latter is superior to the former. But the former has a strong point for easy implementation and extensibility. The proposed ATM switch fabric architecture is applicable to mobile communication, narrow band services over ATM network.

• 감성과학
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• 제21권4호
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• pp.55-62
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• 2018

웨어러블 광섬유 직물의 주요 요건은 의류에 적용하기 위해 높은 유연성을 전제로 해야 한다는 점과 인체의 평평한 부위뿐만 아니라 굴곡이 있는 구간에서도 발광 효과, 즉 휘도를 유지해야 한다는 점이다. 따라서 본 연구에서는 위 조건을 충족하는 웨어러블 광섬유 직물의 세부 구조를 직조(weaving) 타입과 자수(computer embroidery) 타입의 2가지로 제작하였고, 이를 토대로 다음의 두 가지 조건에서 실험을 실시하였다. 첫째, 굴곡이 없는 평평한 상태에서의 웨어러블 광섬유 직물을 1cm간격으로 총 10개의 측정점을 좌표화하여 그 휘도를 측정하였다. 둘째, 인체 부위 중 입체적 굴곡이 발생하는 팔뚝 부위에 가로 방향으로 웨어러블 광섬유 직물을 배치하고 1cm 간격으로 총 10개의 측정점을 좌표화하여 그 휘도값을 측정하였다. 그 결과 직조(weaving) 타입의 경우, 평평한 상태에서의 휘도값은 최대 $5.23cd/m^2$, 최소 $2.74cd/m^2$, 평균 $3.56cd/m^2$, 표준편차 $1.11cd/m^2$로 나타났고, 팔뚝 부위에서의 휘도값은 최대 $7.92cd/m^2$, 최소 $2.37cd/m^2$, 평균 $4.42cd/m^2$, 표준편차 $2.16cd/m^2$로 나타났다. 또한 자수(computer embroidery) 타입의 경우, 평평한 상태에서의 휘도값은 최대 $7.56cd/m^2$, 최소 $3.84cd/m^2$, 평균 $5.13cd/m^2$, 표준편차 $1.04cd/m^2$로 나타났고, 팔뚝 부위에서의 휘도값은 최대 $9.62cd/m^2$, 최소 $3.63cd/m^2$, 평균 $6.13cd/m^2$ 표준편차 $2.26cd/m^2$ 나타났다. 즉, 자수(computer embroidery) 타입의 경우가 직조(weaving) 타입의 경우에 비해 더 높은 발광 효과를 보였는데 이는 자수(computer embroidery) 타입의 세부 구조가 배면 소재로 인해 빛의 손실을 줄일 수 있었기 때문으로 사료된다. 또한 두 타입 모두에서 팔뚝부위의 휘도가 평평한 상태에 비해 각각 124%, 119%로 나타나, 인체의 굴곡에도 본 웨어러블 광섬유 직물의 발광효과가 우수하게 나타남을 알 수 있었다. 이는 빛의 파동설을 정의한 호이겐스의 원리(Huygens' principle), 빛 파면의 진행 방향과 이루는 각도(${\theta}$)의 크기에 커지면 이와 비례하여 빛의 세기도 커진다는 호이겐스-프레넬-키르히호프 원리(Huygens-Fresnel-Kirchhoff principle)와 일치하는 결과이다.

• 항공우주시스템공학회지
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• 제10권4호
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• pp.1-10
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• 2016

본 논문에서는 박막구조물 형태를 가진 풍력발전기 블레이드 패브릭스킨의 유체-구조연성해석을 수행하였다. 풍력발전기 블레이드는 5MW급의 중대형 풍력발전기로 선정하여 분석하였으며, 해석의 타당성을 높이기 위하여 다양한 참고문헌을 이용한 검증을 마쳤다. 본 해석에 앞서서, CFD해석과 모달해석을 나누어서 해석을 수행한 후 연성해석 진행하였다. CFD해석에서 나온 공기력 데이터를 장력으로 유지되는 박막구조물인 패브릭스킨에 적용시켜서 최종 구조물의 변형과 변형된 구조물로 인한 공기력의 변화를 확인하였다.

• 패션비즈니스
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• 제23권1호
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• pp.37-48
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• 2019

WKSF (Warp-knitted spacer fabrics) knitted using a double Raschel machine is the three-dimensional knit that has vertically connected separate layers in loop structures. Because of its unique structure, the fabric is light, compressible and breathable. Owing to the high production speed, the use of the fabric is increasing in various areas. The purpose of this study is to establish the design process in the utilization of WKSF program and analyze the difference between WKSF and Neoprene as garment materials.. The study on the design related to WKSF has rarely been carried out because of the complexity of WKSF structure and the difficulties encountered in analyzing the structure and thread. Therefore, checking beforehand the simulation results similar to a final knit using the CAD program for WKSF can only enhance the efficiency of the design for the light knits. The conclusion drawn after designing the light knits using the CAD program and analyzing the pros and cons of WKSF through the various property evaluation techniques is as follows. The tension characteristic analysis results indicated that Neoprene specimen has the elastic transformation and resilience, thus behaving like an elastic product such as rubber. By contrast, in the event that clothing and fashion accessories are designed with WKSF, these products are kept in a boxy style fit so that the fabric can be applied flexibly to a curvy body line. In addition, WKSF is good in forming noticeably around a curvy body, because its resistance shear deformation is lower than that of Neoprene.

• 패션비즈니스
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• 제7권2호
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• pp.156-164
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• 2003

It has been known that the natural colorants exhibit good dye-uptake toward cotton, silk, and wool fibers, while they do poorly toward synthetic fibers. This study utilizes the chitosan treatment in order to improve the dye-uptake for the natural fibers and to enable the synthetic fibers, whose dye-uptake levels are low, show better affinity toward the natural colorants. Since chitosan has $-NH_2$ group and -OH group in the structure, the dyeability of the fabric will be improved when the fabric is treated with the chitosan. Cotton fabric as one of the natural fiber fabrics and nylon fabric as one of the synthetic fiber fabrics were selected for this study. 1. In case of cotton fabric, the chiosan treatment takes effect for the Caesalpinia sappan and cochineal, resulting in remarkable ${\Delta}E$ increase after dyeing. Chitosan helps in developing dark shade by increasing the uptake of the Caesalpinia sappan and cochineal. It does not, however, participate in the developing of the specific color as does a metallic mordant. 2. In case of dyeing cotton fabric with Gardenia jasminoides, the effect of the treatment with mordant and chitosan is not very pronounced. It is thought that the Gardenia jasminoides uptake is accomplished in a direct manner in the cellulose chains without the aid of mordant. 3. Air-permeability is decreased when the non-mordanted and non-chitosan treated cotton fabric is dyed with Caesalpinia sappan, cochineal, and Gardenia jasminoides. 4. In case of nylon fabric, premordanting and chitosan treatments are not highly effective in promoting the dye-uptake.

• 한국의류산업학회지
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• 제17권2호
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• pp.295-304
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• 2015

This paper investigated wear comfort property of heat storage knitted fabrics for high emotional garment. For this purpose, ZrC imbedded PET knitted fabric was prepared and various physical properties such as thermal, wicking and drying characteristics were measured. In addition, far-infrared emission characteristics of ZrC imbedded PET was analysed and tactile hand property and dye affinity of ZrC imbedded knitted fabric were also studied in comparison with regular and other commercial heat storage PET knitted fabrics. It was observed that Zr imbedded amount in the yarn was 19.29% by ingredient analysis and far-infrared emission energy was $3.65{\times}10^2W/m^2$, emissivity was 0.906 at the range of wavelength $6{\sim}20{\mu}m$. It was found that maximum heat flow (Qmax) of ZrC imbedded PET knitted fabric was lower than that of regular PET one and warmth keepability rate was higher than that of regular PET one, which means ZrC imbedded PET have heat storage property. Drying property of ZrC imbedded knitted fabric was better than that of regular PET one due to heat by far-infrared emitted from ZrC in the core of filament. It revealed that wicking property of the ZrC imbedded fabric was not influenced by far-infrared emission, but affected by fibre physical properties. Tactile hand property of ZrC imbedded knitted fabric was not influenced by imbedding ZrC in the filament but affected preferably by structure of knitted fabric. Dye affinity of ZrC imbedded PET knitted fabric was less influenced by dyeing temperature and time than regular PET knitted one.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.260-267
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• 1999

In this paper, We propose the initial shape finding and dynamic analysis of cable dome structure are presented. Cable dome that is consist of three component such as cable, strut and fabric membrane have complex structural characteristics. Main structural system of cable dome is cable-strut tensegric system, and fabric membrane element Is conceived as cladding roof material. One of the important problem of cable dome is shape finding of those subjected to cable and membrane forces, which stabilize the structures. And the other is structural response from external load effect such as snow and wind When cable dome are subjected to dynamic load such as wind load each structural component has many important problem because of their special structural characteristics. One problem is that geometrical nonlinearity should be considered in the dynamic analysis because large deformation is occurred from their flexible characteristic. The other problem is that wrinkling occurs occasionally because cable and membrane elements can not transmit compressive forces. So this paper describe the physical structural response of cable dome structure.