• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1999.11a
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• pp.120-125
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• 1999

• Proceedings of the KIEE Conference
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• 2004.11d
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• pp.10-13
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• 2004

현재 고도의 정보화 사회에서는 계측기 및 정보통신기기의 발달로 정확한 신뢰성이 요구되고 있으나, 정전이나 순간적 전압강하와 같은 전력장애의 요인은 산업에 막대한 영향을 미치므로 경제적 손실 등의 치명적인 피해를 준다. 이 문제를 해결하는 방안으로 무정전전원장치(UPS : Uninterruptible Power Supply)의 필요성이 요구되는 현실입니다. 그러나 UPS을 사용함으로써 문제점도 야기되고 있는 주요 원인은 밧데리의 불량과 교체에 따른 환경적인 문제가 대두되고 있는 헌상입니다. 문제점을 해소하기 위한 방안으로 축전지없이 정전을 보상하는 방식을 채택시 축전지 설치장소 확보, 운영관리, 교체 등에 따른 경제적 손실을 크게 줄일 수 있으며, 또한 축전지 미사용으로 인한 환경공해 문제가 해결 할 수 있다. 이러한 문제점을 해결하고자 PS 장비의 효율성과 신뢰성 모두가 향상되고 또한 장비의 연간 유지보수 비용 절감 및 환경 공해로부터 문제를 해소 할 수 있는 다이나믹 무정전전원장치(Dynamic Uninterruptible Power Supply)의 필요성이 대두되고 있는 실정입니다.

• Applied Chemistry for Engineering
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• v.5 no.1
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• pp.44-53
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• 1994

A study on the iron electrode which is a good material for alkaline battery because of its superior characteristics including high theoretical capacity density, low toxicity, low cost and inexhaustible supply was performed to develop high performance nickel-iron secondary battery. The characteristics of chrage-discharge reaction were examined by cyclic voltammetry technique SEM and XRD analysis. The capacity of the test electrodes was determined by the costant current charge-discharge method. It was found that the purity and particle size of iron material were the major determinant factors of electrode capacity. With the addition of $Na_2S$ into the electrolyte the capacity of electrode was increased about 20 % caused by the prevention of passivation and the increase of hydrogen overpotential. The stability and capacity of electrode were increased with the use of Ni-fibrex and foamed Ni collectors and also depended on the sintering temperature. The capacity of electrode was 350 mAh/g(0.2 C) which corresponded to 36% utility.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.5
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• pp.18-24
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• 2006

This paper proposed UPS system parallel connected in battery and ultracapacitor to compensate instantaneous voltage drop. Ultracapacitor parallel connected with battery compensate instantaneous voltage drop at failure and it's reduced the voltage regulation of output voltage. We are produced for fast instantaneous voltage drop compensation of ultracapacitor at UPS system and experiments are achieved. Experimental result was verified that the ultracapacitor indicated the fast compensation characteristics and regulation of the output voltage satisfied within 5[%] by using ultracapacitor.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.4 no.4
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• pp.258-263
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• 2011

In this paper, a high quality battery charge-discharge controller for new & renewal energy power generation system is designed. The proposed new controller has a function to manipulate the battery charging current precisely and it is suitable for various batteries including Lead-Acid battery generally used for solar power generation system. LCD display function is implemented to enhanced the user's convenience and minimization of standby power consumption is realized by optimal design using CAD tools.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.63-120
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• 2003

연료에 포함되어 있는 수소와 산소의 전기화학적 반응을 통해 연속적으로 전기와 열을 동시에 생산. 축전지(Battery)가 아닌 무공해, 고효율의 발전기임. 미국에서 우주선용으로 개발되었고 60년대 후반부터 에너지 기술로의 개발이 추진되어 실용화 단계에 있는 2000년대의 신 에너지기술.(중략)

• 한국전기화학회:학술대회논문집
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• 2004.10a
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• pp.37-37
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• 2004

• 한국항공운항학회:학술대회논문집
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• 2004.11a
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• pp.173-177
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• 2004

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.6
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• pp.835-841
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• 2011

Wave power generation systems operated in the ocean, has been developed as large power and grid power connection systems in general. However, small wave power generation systems offer operational efficiency for the lighted (navigation aids) buoy. They simply adopts a full-wave rectification for charging battery (direct connection method). In this paper, a wave power controller based on a booster converter is developed by considering a characteristic of the wells turbine. Both direct connection and booster converter power controller is designed and tested to compare the characteristics. Experiments demonstrate that the output of the proposed controller has improved the characteristic of output power, when generator output voltage is low.

• Journal of Hydrogen and New Energy
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• v.15 no.1
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• pp.1-11
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• 2004

Hybrid power systems with fuel cells and batteries have the potential to improve the operation efficiency and dynamic response. A proper load management strategy is important to better system efficiency and endurance in hybrid systems. In this paper, a fuzzy logic algorithm has been used to determine the fuel cell output power depending on the external required power and the battery state of charge(SoC). If the required power of the hybrid system is small and the SoC is small, then the greater part of the fuel cell power is used to charge the battery pack. If the required power is relatively big and the SoC is big, then fuel cell and battery are concurrently used to supply the required power. These IF-THEN operation rules are implemented by fuzzy logic for the energy management system of hybrid system. The strategy is evaluated by simulation. The results show that fuzzy logic can be effectively used to optimize the operational efficiency of hybrid system and to maintain the battery SoC properly.