• 기술세미나
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• s.3
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• pp.69-73
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• 2006

• Composites Research
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• v.36 no.1
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• pp.32-36
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• 2023

Recently, as global environmental issues for sustainable development, such as carbon neutrality, have emerged, disposal methods of glass fiber composites, a material of existing wind turbines, have become a problem. To solve this problem, in this study, 30kW wind turbine blades were manufactured using flax fiber-based composites, which are eco-friendly natural fiber composites that can replace existing glass fiber composites, and their suitability was evaluated. First, mechanical strength tests were conducted to verify the feasibility of using eco-friendly natural flax fiber composites as a wind turbine blade material, and as a result, better strength were confirmed compared to previous studies on the properties of flax fiber composites. In addition, the suitability was confirmed through a static strength performance evaluation test to measure the static strength of the flax fiber composite blade using the manufactured 30kW class flax fiber composite blade.

• Composites Research
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• v.35 no.4
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• pp.242-247
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• 2022

This study has a different direction from the existing technology of applying recycled carbon fiber obtained by recycling waste CFRP to CFRP again. A study was conducted to utilize recycled carbon fiber as a raw material for manufacturing a carbon/carbon (C/C) composite material comprising carbon as a matrix. First, it was attempted to recycle a commonly used epoxy resin composite material through a thermal decomposition process. By applying the newly proposed oxidation-inert atmosphere conversion technology to the pyrolysis process, the residual carbon rate of 1~2% was improved to 19%. Through this, the possibility of manufacturing C/C composite materials utilizing epoxy resin was confirmed. However, in the case of carbon obtained by the oxidation-inert atmosphere controlled pyrolysis process, the degree of oxygen bonding is high, so further improvement studies are needed. In addition, short-fiber C/C composite material specimens were prepared through the crushing and disintegrating processes after thermal decomposition of waste CFRP, and the optimum process conditions were derived through the evaluation of mechanical properties.

• The magazine of the Korean Society for Advanced Composite Structures
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• v.4 no.3
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• pp.30-36
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• 2013

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.40 no.9
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• pp.46-60
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• 2011

지금까지 각 제품별로 국한되었던 신 재생에너지를 융복합하여 안정적인 에너지원으로 활용하기 위한 신 재생에너지 융복합 엔지니어링에 대해 설명한다.

• Journal of Digital Convergence
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• v.19 no.7
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• pp.189-197
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• 2021

In order to commercialize technology, Korea is continuously fostering specialized institutions for technology transfer/commercialization, and it is composed in various forms. However, there are limited studies on corporate performance according to the type of technology transfer/commercialization specialized institution and the type of support. This study aims to measure the combined utilization performance and performance of companies that have adopted the technology by classifying the types of technology transfer/commercialization specialized institutions. To this end, a study was conducted on 380 companies that promoted the introduction and use of external technologies. As a result of the analysis, it was found that the more the combined use of technology transfer/commercialization specialized institutions has a positive effect on corporate performance, and has different effects on corporate performance depending on the items of external technology introduction. In addition, it was found that the earlier the industrial growth stage is, the higher the corporate performance. Through this study, implications of strategies for the use of specialized organizations for technology transfer and commercialization and introduction of external technologies of the company were presented at the corporate level.

• Product Safety
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• s.53
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• pp.18-20
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• 1997

하이브리드 마케팅 시스템(Hybrid Marketing System)이란 종래에는 하나의 판매방식으로 소비자의 구매의 결정단계를 고려하지 않고 마케팅의 전과정을 수행하였는데, 이에 비해 하이브리드 마케팅 시스템은 여러 가지의 판매방식을 복합적으로 활용하여 잠재 고객에게 보다 효율적으로 접근하고자 하는 것이다. 이러한 복합적 판매방식을 이용함으로써 고객에게서 나온 정보와 판매과정의 정보를 활용할 수 있어 마케팅 활동을 보다 효율적으로 수행할 수 있는 점이

• Journal of Digital Convergence
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• v.13 no.6
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• pp.29-37
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• 2015

Entering the convergence education era, the emergence of smart devices removed the constraint of time and space for study, so if we use smart devices appropriately for education, it will strengthen students' abilities and cultivate creative human resource. Therefore the current study analyzed the general application condition of the smart devices through surveys targeted to students and proposed a measure in applying the smart device as an educational information. In relation to information application, a test was proceeded after carrying out education targeted to experiment group students by naming the group information search, communication, cooperation, sharing, report generation, data storage, online assessment and project management activity. Through the test and survey analysis, it was discovered that the experiment group students displayed higher self-efficacy and ability in applying the smart device as information compared to the control group.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.33 no.2
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• pp.81-93
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• 2020

The fatigue characteristics of glass fiber reinforced plastic (GFRP) composites were studied under repeated loads using the finite element method (FEM). To realize the material characteristics of GFRP composites, Digimat, a mean-field homogenization tool, was employed. Additionally, the micro-structures and material models of GFRP composites were defined with it to predict the fatigue behavior of composites more realistically. Specifically, the fatigue characteristics of polybutylene terephthalate with short fiber fractions of 30wt% were investigated with respect to fiber orientation, stress ratio, and thickness. The injection analysis was conducted using Moldflow software to obtain the information on fiber orientations. It was mapped over FEM concerned with fatigue specimens. LS-DYNA, a typical finite element commercial software, was used in the coupled analysis of Digimat to calculate the stress amplitude of composites. FEMFAT software consisting of various numerical material models was used to predict the fatigue life. The results of coupled analysis of linear and nonlinear material models of Digimat were analyzed to identify the fatigue characteristics of GFRP composites using FEMFAT. Neuber's rule was applied to the linear material model to analyze the fatigue behavior in LCF regimen. Additionally, to evaluate the morphological and mechanical structure of GFRP composites, the coupled and fatigue analysis were conducted in terms of thickness.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.720-723
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• 2011

본 연구는 보령머드 활성화를 위한 사전연구로서, 보령의 바다진흙 소재를 활용하여 산업간 연계협력(바다 진흙+제조업+서비스업)으로 결합된 공동브랜드와 복합테마거리 조성을 통해서 산업간 융복합화를 실현하여 보령머드를 활성화시킬 수 있는 방안을 제안하는데, 연구의 주목적을 두고 있다. 연구결과, 충청남도의 화장품, 미용기기 용품 등의 연구개발 및 제조업과 뷰티서비스업, 의료 미용업들을 융복합화하여 보령의 장점인 고품질 천연자원(보령머드)를 활용해서, 보령머드축제를 연계시켜 산업간 공동브랜드를 개발하고, 보령머드 복합테마거리를 조성한다면 관련 기업의 성장은 물론, 지역의 고용창출효과가 커서 보령머드의 활성화에 크게 기여할 것으로 보인다.