• Journal of the Korean Society of Manufacturing Process Engineers
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• v.10 no.1
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• pp.47-53
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• 2011

From recent research, it has revealed that Electroacitve polymer(EAP) has a physical limitation. Carbon nanotube(CNT) is known as the promising material which has excellent electro-mechanical characteristics and is mostly defect-free. It is expected that a successful synthesis of CNT and Nafion known as a primary material for IPMC would make a great improvement on its electro-mechanic feature. In this paper, we suggest the method of synthesis of CNT with Nafion which improves electro-mechanical characteristic. Using mechanical dispersion with Nafion and Isopropyl Alcohol(IPA), we disperse Single-walled carbon nanotubes(SWCNT). For a uniformly layer of CNT, we used a spray gun on a hot plate by a simplified method. In the result, we fabricated a disperse SWCNT/Nafion composite uniformly.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.04a
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• pp.41-44
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• 1997

Using the 2 probe mothods, AC coductivities, dielectric loss factors, capacitances, and impedances were investigated to study. The electrical and sensing properties for SnO$_2$ added ZnO. In air The electrical conductivity of SnO$_2$added ZnO decrease by increasing the content of SnO$_2$, and the relative dielectric constants for 0.05, 5, 7 SnO$_2$ added ZnO are 55, 20, 14, respectively. In 3000ppm CO Gas. relative dielectric constants for 3, 5mol% SnO$_2$ added ZnO are 163, 68, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.04a
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• pp.103-106
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• 1997

The electrical properties and the sensing properties of ZnO-TiO$_2$ composites were investigated by using the complex impedance measurement and voltage-current source and measurement unit. In air, the electrical conductivity of TiO$_2$ added ZnO increase with increasing the content of TiO$_2$ and the relative dielectric constants for 3, 5 and 7mol% TiO$_2$ added ZnO are 7, 13 and 120, respectively. In 3000ppm CO gas, the relative dielectric constants for 3, 5mol% TiO$_2$ added ZnO are 25, 28, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.160-161
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• 2006

To Improve the mean-life and the reliability of power cable, we have investigated thermal conductivity of XLPE insulator and semiconducting materials in l54[kV] underground power transmission cable. Specimens were made of sheet form with the nine of specimens for measurement. Thermal conductivity were measured by Nano Flash Diffusivity thermal conductivity measurement temperature ranges of XLPE insulator were from 20[$^{\circ}C$] to 90[$^{\circ}C$], and the heating rate was 1[$^{\circ}C$/mm]. In case of semiconducting materials. the measurement temperature ranges of thermal conductivity were from 20[$^{\circ}C$] to 60[$^{\circ}C$], and the heating rate was 1[$^{\circ}C$/min].

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.377-380
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• 2006

HPFRCCs(High performance fiber reinforced cementitious composites) is a class of FRCCs(Fiber reinforced cementitious composites) exhibit multiple crack. Multiple crack lead to improvement in ductility, toughness, and deformation capacity under compressive and tensile stress. These properties of HPFRCCs are affected by type of fiber, water cement ratio, type of admixture and rate of substitution. Furthermore these influence dispersion of fiber, mixing performance and fluidity of mixture. In this paper, HPFRCCs made of steel cord and carbon fiber were tested with water cement ratio, type of admixture and rate of substitution to evaluate characteristics of mixing and flexural strength.

• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.206-207
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• 2000

A disposable, electro-chemiluminescent immunosensor utilizing a screen-printed carbon electrode and liposome coupled to antibody as tracer has been constructed. In proportion to the analyte (Legionella species as a model) concentration, the analyte-immunoliposome complexes were transferred by the capillary action through a membrane strip to the electrode, the liposomes were lysed in the presence of detergent, and ruthenium was released for signal generation. Such performance of the immunosensor was appropriate for a point-of-care testing.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2017.05a
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• pp.118.1-118.1
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• 2017

다이아몬드 코팅은 다이아몬드 자체의 우수한 경도 및 여러 장점을 가진 특성으로 엔드밀과 같은 공구강을 비롯하여 기존 물질의 물리적 경도를 향상 시키는 데 있어서 많은 분야에서 연구 되고 있다. 그 중에서도 활용 방면이 높은 분야는 탄소 섬유 강화 복합체(CFRP)와 같은 난삭재의 절삭가공기술에 있어서 매우 효과적인 성과를 보이고 있다. HF-CVD를 통한 다이아몬드 코팅을 함에 앞서, 전산 해석을 통해 다이아몬드의 코팅에 있어서 결정적인 요소인 온도와 압력을 우선적으로 계산을 하여 다이아몬드가 코팅이 되는 가정 적합한 온도와 압력을 찾은 뒤 실험을 진행 하였다. 전산 해석은 ANSYS Workbench를 이용하여 진행하였다. Workbench내의 프로그램 중 형상을 그리는 것은 Design Modeler, 격자를 구성하는 것은 Mesh, 계산은 FLUENT를 이용하여 진행하였다. 형상의 모델링은 HFCVD장비의 실제모습을 최대한으로 구현하였으며, 다이아몬드 증착 과정에서 일어나는 필라멘트의 온도와 챔버의 냉각 정도 그리고 공정 기체를 적용하여 시뮬레이션을 시행 하였다. 시뮬레이션 결과를 바탕으로 적정 온도 범위와 압력을 기반으로 HF-CVD를 통해 다이아몬드 코팅을 시행 하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.19-20
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• 2014

연료전지 스택을 구성하는 핵심 부품 중 하나인 분리판(Bipolar plate)은 반응 연료인 수소와 산소를 분리하여 셀(cell)의 전면적에 균일하게 분배, 공급, 배기 및 전기화학반응에 의해 생성된 전류를 수집하며, 높은 가스밀폐성, 전기전도성 및 내식성이 요구된다. 분리판 소재로는 흑연, 고분자-탄소 복합체 및 금속 등이 사용되고 있으며, 이중 연료전지 스택의 부피, 무게 및 제조비용 감소를 위하여 금속분리판이 주목받고 있다. 그러나 금속분리판의 경우 연료전지 작동환경에서 부식반응에 의한 이온 용출로 인해 전극촉매나 고분자전해질막의 오염을 유발할 수 있다는 단점이 있어 최근 금속계 분리판의 코팅을 통하여 분리판의 내식특성 및 전기적 특성을 향상시키는 연구가 활발히 진행되고 있다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.174-175
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• 2014

We fabricated a Ni/C composite thick film on ${\alpha}-Al_2O_3$ substrate. A number of precipitations were observed on the film surface. Structural characterization was performed on the observed precipitations using transmission electron microscopy (TEM) with help of the elemental mapping, electron diffraction (ED) and ED simulation. The structural characterization revealed that the precipitation is ${\theta}-Al_2O_3$ having the space group of C2/m (Monoclinic).

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1439-1442
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• 1997

We investigated the electrical and CO sensing properties of ZnO-$TiO_2$ composite ceramics. The electrical conductivities and relative dielectric constants of $TiO_2$ added ZnO increased with increasing $TiO_2$ content in air. The calculated dielectric constants of 3mol%, 5mol%, and 7mol% $TiO_2$ added ZnO were 7, 13, and 120, respectively. The measured CO sensivities were $1{\sim}6.42$ in the temperature range from $100^{\circ}C$ to $400^{\circ}C$.