• Composites Research
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• v.33 no.6
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• pp.360-364
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• 2020

Although research and development of existing steel-made Cowl Cross Member(CCM) was carried out with magnesium and plastic to make vehicles lighter, it is difficult to apply them to performance problems in the vehicle's mounting condition. Recently, the company is conducting research on the injection CCM of the composite insert as a lightweight component that is most suitable for mass-production of automotive parts. This is a manufacturing process that inserts composite injection bracket parts into aluminum bar, and the adhesion of the two parts is one of the important factors considering the vehicle's mounting conditions. In this study, the joint strength of Aluminum bar is one of the important factors as a study for the injection of aluminum bar into PA6-GF60 composite material. For the analysis of these research, the method of spraying adhesive to the aluminum bar and the case of knurling treatment have been analyzed and the bonding strength of the direction of rotation and lateral direction has been analyzed for each part between the aluminum bar of the cowl cross member and the shape of the injection component of composite materials.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.1
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• pp.162-174
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• 1992

Blades are one of the critical parts of the wind machine. This paper presents a design procedure for the blade of a 7m diameter horizontal axis wind turbine with the constraint conditions of stresses and fundamental frequency. This blade consists of glass/polyester woven fabric and unidirectional prepreg. It was firstly designed by the classical beam theory on the assumption that torque box sustains all external loads and the reliability of the blade was then inspected in the preliminary estimation by using FEM.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.26 no.1
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• pp.25-31
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• 2020

Recently, applications of biomass-based plastics have increased according to the eco-friendly policy of the reduction of carbon dioxide emissions in domestic and foreign government. In this study, a paper plastic composite was produced by compounding polypropylene and micronized paper powder that was prepared using dry pulverization technology. Subsequently, the specimen of paper plastic was verified with mechanical properties, formability and product safety test to confirm the suitable packaging materials for food packaging. Paper plastics showed slightly lower mechanical properties than currently commercialized PP composites. However, paper plastics are valuable materials as environmentally friendly carbon-reducing material because of high biocarbon content, light weight features and applicability of existing manufacturing machines or system.

• KIPE Magazine
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• v.14 no.4
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• pp.23-27
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• 2009

자동차 산업의 공통된 최대 이슈는 환경, 안전, 에너지, 편의이다. 이러한 시대적 요구에 따라 자동차 메이커들은 대응 방안 마련은 물론 시장 주도를 위한 기술개발 등 다양한 노력을 하고 있으며, 전장부품과 센서 등 최첨단 하이테크 기술과 플라스틱 , 나노, 하이브리드 소재 등이 적용된 다양한 부품들을 자동차에 적용시키고 있다. 또한수소연료전지, 바이오디젤, 태양광, 전기 등 석유 대체 에너지를 적용한 차세대 연료 자동차들이 전세계 모터쇼 등 전시회에 출품되어 세계의 이 목을 집중시키고 있으며 , 이미 일본과 미국시장을 중심으로 하이브리드 전기 자동차(HEV) 및 수소연료전지 자동차 (FCEV) 시장이 확대대고 있는 실증이다 따라서 국내에서도 그런카에 대한 관심도가 증가하고 있고 일부에서는 개발에 박차를 가하고 있다. 이에 그린카에 대한 간단한 구조와 최근 연구동향에 대해서 기술하고자 한다.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2000.10b
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• pp.62-66
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• 2000

비닐하우스내 연질피복자재의 표면에 온도차이와 다습한 조건으로 물방울이 부착되어 광투과율이 떨어지고, 물방울끼리 결합된 커다란 물방울은 작물체에 직접 떨어져서 물리적인 손상과 냉해 및 병해를 유발하게된다. 이러한 문제점을 해결하게 위하여 폴리머로 구성된 플라스틱 피복자재의 표면에 계면활성제을 첨가하여 방적성을 높이는 제품이 보급되고 있으나, 연질필름 종류별 방적성에 대한 기준 제시가 미흡하여 농가의 구입혼란을 초래하고 있는 바, 간편하고 용이한 방적성 검정기술이 필요하여 수적직경을 측정함으로서 방적성에 대한 간이측정기술을 개발하였다. (중략)

• Proceedings of the Korea Concrete Institute Conference
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• 1997.04a
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• pp.669-675
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• 1997

This paper investigates the performances of GFRP bar and its possibility for using a substitute of steel bar. GFRO bar was made with introducing the glass fiber into GTR added UPE. We carried out the tensile test of GFRP and steel bar and out the three point bend test bond-test and fracture energy measurement on the GFRP bar and steel bar reinforced concrete. The GFRP bar was excellent as comparison with steel bar in the contribution to the energy absorption and the ductility of concrete. But its tensile, bond and bend strengthes were comparatively small. In order to improve these defects, we judged that glass fibers in GFRP bar must be completely adhesive one another by the impregnating glass fibers into UPE.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.174-178
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• 1999

현재 농가에 많이 보급되어 있는 플라스틱피복 파이프 온실은 폭설이나 돌풍을 비롯한 강풍하에 놓이게 되면, 피복재의 파손이나 구조적인 붕괴현상으로 인하여 온실내 재배작물이 치명적인 피해를 입는 경우가 발생하게 된다. 실예로 1994년 2월 12일의 폭설과 1995년 7월 23일의 태풍 등 최근 2년을 연속하여 폭풍이나 강풍으로 막대한 피해를 경험한 바 있으며, 1997년 11월 12일의 나주 돌풍, 1998년 1월 8일 서부 경남지역의 강풍을 동반한 폭설, 1999년 8월 3일에 상륙한 태풍 올가 등은 온실과 같은 경량구조물의 안전을 크게 위협하고 있다. (중략)

• Proceedings of the KOR-BRONCHOESO Conference
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• 1981.05a
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• pp.8.4-8
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• 1981

Foreign bodies in the esophagus are frequently seen in the otolaryngologic field and there are numerous reports of them. Also the kinds of these foreign bodies are valiable and almost all things arround us are likely to be foreign bodies. Authors have recently experienced three cases of rare and interesting foreign bodies in the esophagus. Foreign bodies were removed by endoscopy and all of these were sharp square shaped hard plastic package which enclosing tablet of medicine. This is the report of clinical findings on these cases along with literature review.

• Journal of the Korean Applied Science and Technology
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• v.30 no.4
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• pp.701-714
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• 2013

Recently, due to the activation policy of biodiesel, the blending biodiesel to petroleum product is increasing. Low-temperature fluidity and oxidation stability are the most significant issues to the marketers and end users of biodiesel. Thus, the way to control the quality of biodiesel blended fuels was investigated by duplicating the real storage situation of biodiesel blended fuels and evaluating the effect of oxidation trend and quality degradation. From the results of oxidation degradation test of biodiesel blended fuels, no special quality degradation has been observed through the evaporation for 18 weeks in a summer season under a storage circumstance without exposure to the sun light. However, the severe quality degradation was observed in PE vessel in only 2 weeks of storage. This oxidation degradation was also verified with FT-IR spectrum change. However, the special symptom cannot be distinguished by the quality test because the quality specifications were satisfied despite of the drastic oxidation degradation. Namely, the problem in a vehicle could be occurred by oxidation materials(polymer, organic acid. etc.) under oxidation even though it satisfied the quality specification.

• Journal of Life Science
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• v.33 no.7
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• pp.593-604
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• 2023

The ocean accounts for over 70% of the Earth's surface and is a space of largely unexplored unknowns and opportunities. Korea is a peninsula surrounded by the sea on three sides, emphasizing the importance of marine research. The ocean has an extremely complex environment with immense biological diversity. In terms of microbiology, the marine environment has varying factors like extreme temperature, pressure, solar radiation, salt concentration, and pH, providing ecologically unique habitats. Due to this variety, marine organisms have very different phylogenetic classifications compared with terrestrial organisms. Although various microorganisms inhabit the ocean, studies on the diversity, isolation, and cultivation of marine microorganisms and the secondary metabolites they produce are still insufficient. Research on bioactive substances from marine microorganisms, which were rarely studied until the 1990s, has accelerated in terms of natural products from marine Actinomycetes since the 2000s. Since then, industries for bioplastic and biofuel production, carbon dioxide capture, probiotics, and pharmaceutical discovery and development of antibacterial, anticancer, antioxidant, and anti-inflammatory drugs using bacteria, archaea, and algae have significantly grown. In this review, we introduce current research findings and the latest trends in life science and biotechnology using marine microorganisms. Through this article, we hope to create consumer awareness of the importance of basic and applied research in various natural product-related discovery fields other than conventional pharmaceutical drug discovery. The article aims to suggest pathways that may boost research on the optimization and application of future marine-derived materials.