• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.6
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• pp.920-925
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• 2012

A study of vehicle weight lightening has been progressed to reduce the fuel consumption. In this paper, the body floor in an EV (Electric Vehicle) bus has been applied by composites as CFRP and GFRP. In order to analyse a various reliability and safety, an experiment and FEM analysis was carried out to obtain weight lightening. Especially, the joint. An effective design is obtained through an experiment as well as FEM analysis. Results of stress analysis of GFRP material showed twice as much displacement than those of CFRP material. Among three kinds of joint methods, the bond joint method is occurred to a substantial shape change in the body and floor. It is found that the rivet joints are fairly suitable for stress sustaining capability.

• 대한예방의학회:학술대회논문집
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• 1995.10a
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• pp.261-262
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• 1995

• Design & Manufacturing
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• v.10 no.3
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• pp.39-45
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• 2016

The purpose of this study is to build effective cooling circuit design in injection mold to improve glass fiber reinforced laptop computer cover plastics' transcription and gloss. Moldflow Insight and Ansys CFD CAE program used to verify efficiency and the experiment mold is precision machined and brazing soldered to make three-dimension cooling channel. The temperature of mold in injection test are fixed to $80^{\circ}C$ and $160^{\circ}C$. The result of this experiment is the improved surface quality of plastics with 85% improvement of transcription in high temperature mold.

• Journal of the korean Society of Automotive Engineers
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• v.10 no.1
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• pp.33-41
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• 1988

A turning (facing) test on Glass Fiber Reinforced Plastics was performed with several tool materials, e.g., cemented carbides, cermet and ceramic, and the wear patterns and wear rate were analyzed to clarify the relation between physical(mechanical) properties and flank wear of cutting tool. The main results are obtained as follows: (1) When cutting speed is increased, the flank wear in every tool material grows the abnormal wear in the shape of triangle at a certain speed, i.e., a critical speed. (2) When cutting speed is increased, the wear rate in experimental tool material starts to increase remarkably at a critical speed. (3) The thermal conductivity among the properties of the tool material and the thermal crack coefficient of it are almost in proportion to the critical speed. (4) The order of performance in tool materials for cutting GFRP is K 10, M10, P20, TiC, CB.

• Mineral and Industry
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• v.29
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• pp.1-17
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• 2016

점토광물은 자연 산출되는 광물로써 양이 풍부하고 가격이 저렴하여 여러 가지 산업자원으로써 오래전부터 다양하게 활용되어 왔다. 전통적인 주요 활용분야로는 제지 및 코팅 산업의 충진제, 내화재, 세라믹, 유리섬유, 시멘트 등에 90% 이상이 사용되어왔다. 최근에야 고무, 플라스틱 및 페인트의 물성 강화용 충진제로, 넓은 표면적을 활용한 촉매제로 일부 사용되고 있지만 대부분 판상용 점토광물을 대상으로 하고 있다. 고령토가 국내 생산 주요 품목에 들어가지만 그 비중은 2014년 기준 1.9%로 낮으며, 그나마 자급율도 77% 수준이라 수입에 의존하고 있다. 생산되는 고령토의 양이 매년 감소하고 있는 추세이며, 2014년 기준 고품질인 Wa와 Wb의 생산량이 각각 600 톤과 227 톤으로 미미한 수준이며 P급이 4.1만 톤 수준이라 부가가치가 매우 낮은 상품 중의 하나로 보인다. 다행히 우리나라에서 생산되는 고령토의 많은 부분이 할로이사이트 계열 고령토이고, 할로이사이트의 독특한 나노튜브 형태는 신소재 개발과 더불어 부가가치가 높은 새로운 활용분야를 개척하기 아주 적절한 광물이어서 그 특성과 산업적 활용 특성을 중심으로 최신 연구동향과 활용분야를 소개하고자 한다.

• Proceedings of the Korean Geotechical Society Conference
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• 2001.10b
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• pp.31-42
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• 2001

다양한 방식으로 제작된 유리섬유 강화 플라스틱관(FRP pipe)의 인장 및 휨강도 시험 결과로부터 제작방식에 따른 FRP관의 강도 특성을 비교 검토하였다. 또한, 사면보강대책으로서 FRP 그라우팅 공법의 현장 적용성을 평가하기 위하여, FRP 그라우팅에 따른 지반강도의 증진효과 및 보강재의 인발저항력을 산정하였다. 이를 위하여, 지반의 상대밀도 및 구속압에 따른 보강재 인발저항력의 변화 및 압력주입에 의한 확공효과 평가를 위하여 실내모형실험이 이루어졌다. 또한, FRP 그라우팅이 시공된 현장에서 공내재하시험, 투수시험, 그리고 시추공전단시험 등을 실시하여 FRP 그라우팅에 의한 지반보강 효과 및 차수효과를 정량적으로 산정하였다.

• Journal of Ocean Engineering and Technology
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• v.27 no.6
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• pp.112-118
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• 2013

This paper reports the results of a comparative study on rudder performance between the steel rudders that have been used in coastal angling fishing boats in the 20-GT class and the newly developed FRP composite material rudders. In order to compare the rudder performances of these two types, a sea trial test was carried out to investigate the speed performance, fuel consumption, and ship's turning ability. The results showed that the sea trial performance of the FRP composite rudder was better than that of the steel rudder type in terms of the sea speed, fuel consumption rate, and turning ability.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.352-353
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• 2003

Clay 분산 유/무기 나노복합재 제조기술은 실리케이트 층상구조의 점토광물을 나노 스케일의 시트상의 기본 단위로 박리(exfoliation)하여 고분자수지에 분산시킴으로써 범용 고분자의 낮은 기계적 물성의 한계를 엔지니어링 플라스틱 수준으로까지 올리고자 하는 것으로서, 기존의 무기 충진재 및 강화재의 입자크기(〉1 $\mu\textrm{m}$)를 나노 스케일까지 분산시켜 기존 무기물 충진 복합재의 단점을 한층 보완하는 것을 목표로 하고 있어 성능 및 원가 면에서 매우 유리한 방법으로 21세기의 복합재료 생산시장의 판도에 상당한 변화를 가져오게 할 수 있는 핵심기술이라 할 수 있다. (중략)

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.05b
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• pp.242-245
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• 2000

The fiber contributes the high strength and modulus to the composite. The fiber orientation in FRP has a great effect on the strength of FRP because the strength of FRP mainly depends on the strength of fiber. In this study, FRP was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to give fiber orientation to the FRP. The bending strength and bending stresses of FRP rods were simulated according to the winding orientation of glass fiber. The bending strength of FRP was also evaluated. The results of simulation and evaluation Were compared each other to investigate main stresses which affect the fracture of FRP. The main stresses which had a great effect on the strength of FRP were shear stresses.

• Journal of the Korean Society for Marine Environment & Energy
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• v.12 no.1
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• pp.29-34
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• 2009

For several decades, many researchers have been involved in developing recycling methods for FRP boats. There are four basic classes of recycling covered in the literature. Despite of environmental problems(safety hazards), mechanical recycling of FRP boats, which involves shredding and grinding of the scrap FRP, is one of the simpler and more technically proven methods than incineration, reclamation or chemical ones. Because FRP is made up of reinforced fiber glass, it is very difficult to break into pieces. It also leads to secondary problem in recycling process, such as air pollution and unacceptable shredding noise level. Another serious problem of mechanical FRP recycling is very limited reusable applications for the residue. This study is to propose a new and efficient method which is more wide range applications and environment friendly waste FRP regenerating system. New system is added with the cyclone sorting machine for airborne pollutions and modified cutting system for several glass fiber chips sizes. It also has shown the FRP chip fiber-reinforced concrete and fiber-reinforced secondary concrete applications with the waste FRP boat to be more eligible than existing recycling method.