• Carbon letters
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• v.25
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• pp.78-83
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• 2018

Pyrolyzed fuel oil (PFO) and coal tar was blended in the feedstock to produce pitch via thermal reaction. The blended feedstock and produced pitch were characterized to investigate the effect of the blending ratio. In the feedstock analysis, coal tar exhibited a distinct distribution in its boiling point related to the number of aromatic rings and showed higher Conradson carbon residue and aromaticity values of 26.6% and 0.67%, respectively, compared with PFO. The pitch yield changed with the blending ratio, while the softening point of the produced pitch was determined by the PFO ratio in the blends. On the other hand, the carbon yield increased with increasing coal tar ratio in the blends. This phenomenon indicated that the formation of aliphatic bridges in PFO may occur during the thermal reaction, resulting in an increased softening point. In addition, it was confirmed that the molecular weight distribution of the produced pitch was associated with the predominant feedstock in the blend.

• Journal of Ceramic Processing Research
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• v.19 no.6
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• pp.479-482
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• 2018

Polystyrene superstructure films show faint rainbow color, and this low color saturation limits its wide application. In this paper, polystyrene superstructure films with single bright blue color were prepared by vertical deposition self-assembly method using polystyrene microspheres with average diameter of $310{\pm}10nm$ as raw material. Polystyrene superstructure films were modified by adding nano-carbon powder, and effect of the amount of nano-carbon powde on color performance was studied. The results showed that without addition of nano-carbon powder, the superstructure films showed a faint rainbow color, while with addition of nano-carbon power, the superstructure films exhibited a single bright blue under the same natural light source. Changing the amount of nano-carbon powder addition could adjust color saturation of the film. With increasing the amount of nano-carbon powder addition from 0.008 wt% to 0.01 wt%, color saturation of the superstructure film increased gradually. Further increasing the amount of nano-carbon powder addition to 0.011wt%, color saturation of the superstructure film didn't increase anymore and tended to get dark.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.176-176
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• 2003

• 한국생물공학회:학술대회논문집
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• 2005.04a
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• pp.466-466
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• 2005

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1268-1269
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• 2011

본 논문에서는 친환경 전동기기의 에너지 저장장치로 널리 사용되고 있는 Lead-Acid 배터리의 특성을 나타내었고, 급속충전을 하기 위한 충전패턴을 보였다. 기존 정전류-정전압 충전패턴이 적용된 상용 제품과 당사가 개발한 급속충전기의 비교 실험을 통해 충전 시간단축을 확인하였다. 급속충전 시스템의 적용을 통해 친환경 전동기기의 성능이 개선될 수 있음을 확인하였다.

• 한국생물공학회:학술대회논문집
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• 2005.10a
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• pp.635-636
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• 2005

• Proceedings of the Membrane Society of Korea Conference
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• 2004.05a
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• pp.199-202
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• 2004

Membrane technology is widely employed as a means of producing various qualities of water from surface water, well water, brackish water and seawater. This is also used in industrial wastewater treatment and its recycling process. A large volume of wastewater is generated by the steel industry. Presently, the treated wastewater from the steel industry cannot be recycled, because some of its components cause either direct or indirect problems.(omitted)

• Carbon letters
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• v.17 no.1
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• pp.70-73
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• 2016

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.412-413
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• 2003

• Journal of the Korean Society of Industry Convergence
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• v.27 no.1
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• pp.71-76
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• 2024

Automatic production systems are constantly advancing technologies to improve productivity and safety. Specifically, liquid filling machines are primarily utilized to package products into drums after manufacturing process in the hazardous chemical industry. Most existing filling machines allow the operator to open the drum cap and inject the product directly or semi-automation. In this study, we have developed a cap opening and closing mechanism onto the existing drum filling machine, enabling automatic and safe cap manipulation while filling the product in the IBC tank. By applying the appropriate torque value through numerical analysis, we confirmed that the system worked without any problems during the process of opening and closing the cap. Therefore, it is expected that the developed machine will give more production and reduce human efforts without risk in the chemical packaging industry.