• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2007.04a
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• pp.199-200
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• 2007

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2006.04a
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• pp.81-81
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• 2006

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.321-321
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• 2011

• Proceedings of the KWS Conference
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• 2004.05a
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• pp.285-287
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• 2004

최근 굴삭기의 대형화 및 고성능화 그리고, 내구성의 향상과 함께 다양한 작업 조건에 효율적인 운전 특성을 확보하기 위한 작업 장치의 구조 형상 최적화를 위한 많은 연구가 수행되고 있다［1,2］. (중략)

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.265-288
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• 2003

PEMFC의 스택은 MEA와 분리판 및 스택 기술의 결합으로 제조, MEA분야는 현재의 기술로 상용화가 충분하며 가격저감을 위해서는 생산기술과 시장확대가 필요함, MEA의 성능, 내구성 향상에 필요한 혁신적이 기술의 핵심을 이온전도막 임, 분리판은 스택기술과 소재기술의 결합으로, 요소기술적인 문제보다는 사업자의 출현으로 생산기술을 확보하는 것이 필수적임(중략)

• Journal of Korea Ship Safrty Technology Authority
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• v.14
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• pp.85-86
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• 2004

고속기관과 같은 특수구조의 기관에 대하여 제작기술과 내구성 등이 과거에 비해 향상된 점을 고려하고 잦은 개방검사에 따른 성능저하를 방지하기 위해 현행의 획일적으로 정해진 기관개방검사주기를 제조자의 개방권고 시간과 정비상태 및 선박의 특성에 따라 개방검사주기를 달리 적용함으로써 고속기관의 성능보호와 민원의 편의를 도모하며, 현행제도상의 일부 미비점을 개선, 보완하려는 것임.<중략>

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.623-624
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• 2010

• Composites Research
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• v.34 no.6
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• pp.380-386
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• 2021

This paper aims to improve the critical speed of power-take-off (PTO) shafts by using carbon fiber reinforced plastics (CFRPs). The PTO shaft was designed with titanium-CFRPs hybrid structure in order to compensate the low shear strength of CFRPs. Based on the requirements for PTO shafts, the dimensions of PTO shafts were determined through a parametric study. To evaluate the performance of the PTO shaft, a vibration test, a static torsion test, and a torsion durability test were performed. In the vibration test, the critical speed of PTO shafts was 20570 rpm, which was 7.5% higher than that of titanium shafts. Additionally, it was confirmed that the maximum allowable torque of the PTO shaft was 2300 N·m. Finally, under repeated load in the range of 11.3 to 113 N·m, the fatigue failure in the PTO shaft did not occur up to 10⁶ cycles.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2009.11a
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• pp.123-124
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• 2009

본 연구는 환경친화적인 수용성 폴리우레탄 코팅 제품의 문제점인 끈적임, 내수압, 투습도 등의 물성저하 및 내구성 문제를 개선하기 위해 졸-겔법을 이용하여 구형의 실리카 나노졸을 제조한 후 이를 수용성 폴리우레탄과 혼합한 후 교직물에 코팅하여 그에 따른 물성 향상에 관한 연구이다.

• Korean Chemical Engineering Research
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• v.58 no.4
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• pp.524-529
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• 2020

To increase the mechanical durability of the proton exchange membrane fuel cells, a reinforced membrane in which a support is placed in the polymer membrane is used. The support mainly uses e-PTFE, which is hydrophobic and does not transfer ions, which may cause performance degradation. In this study, we investigated the effect of e-PTFE support on PEMFC performance and electrochemical durability. In this study, the reinforced membrane with the support was compared with the single membrane (non-reinforced membrane). Due to the hydrophobicity of the support, the water diffusion coefficient of the reinforced membrane was lower than that of the single membrane. The reinforced membrane had a lower water diffusion coefficient, resulting in higher HFR, which is the membrane migration resistance of ions, than that of a single membrane. Due to the low hydrogen permeability of the support, the OCV of the reinforced membrane was higher than that of the single membrane. The support was shown to reduce the hydrogen permeability, thereby reducing the rate of radical generation, thereby improving the electrochemical durability of the reinforced membrane.