• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.161.1-161.1
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• 2010

대표적인 에너지원인 석유는 매장량 및 매장지역이 한정되어 있으며, 환경오염, 연료공급 등의 문제를 안고 있다. 에너지의 대부분을 수입하고 있는 우리나라는 경제성장 및 소득수준 향상으로 에너지 소비량이 증가하면서, 국제유가 상승은 국가 경제에도 큰 악영향을 미치고 있다. 이러한 상황에서 화석연료인 석유를 대체하기 위하여 최근 차세대 대체에너지에 대한 관심이 높아지면서 청정연료인 디메틸에테르(Dimethyl Ether : DME)의 사용방안에 대한 기술개발이 활발히 진행되고 있다. 정부(지식경제부)에서는 DME 보급을 위한 기본계획에서 3단계의 보급계획에 따라 2013년까지 DME를 상용화하겠다는 목표를 발표한바 있다. 그래서 2007년부터 2009년까지 2년간 정부 주관 하에 한국가스공사 등이 1단계 DME 보급을 위한 실증연구를 수행하였다. 1단계 실증연구를 통해 DME-LPG 혼합연료에 대한 품질 및 안전기준을 마련하였으며, DME를 일반 가정 및 상업용으로 시범보급 할 수 있는 특례고시가 2009년 11월에 제정되었다. 현재 제정된 DME-LPG 시범보급 특례고시에 따라 2009년 12월부터 2011년 11월까지 2년간 2단계 시범보급 연구가 진행되고 있다. 2단계 시범보급연구에서는 한국가스공사외 3개 기관이 함께 참여하여 연구를 수행하고 있다. 시범보급에서는 DME-LPG 혼합연료를 일반 가정 및 상업용으로 직접 소비자에게 시범적으로 보급하는 만큼, DME-LPG 혼합연료가 LPG 연료에 비해서 연소효율이 어느 정도 수준인지를 비교하는 것이 매우 중요한 사항이므로 본 실험에서는 가정 및 상업용으로 사용되는 연소기기를 대상으로 LPG 및 DME-LPG 혼합연료에 대해 연소효율을 측정하는 실험을 수행하였다.

• The Magazine for Energy Service Companies
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• s.31
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• pp.38-43
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• 2004

가스터빈을 이용하는 발전시스템 중에서 발전용량이 300kW 이하인 시스템을 마이크로터빈 발전 시스템이라 하며, 가스터빈에서 배출되는 폐열을 활용하여 열효율을 극대화시킨 것이 열병합발전 시스템이다. 마이크로터빈 열병합발전 시스템은 소형이면서 발전 및 열효율이 높고, 환경친화적인 제품 특성을 갖고 있으며, 또한 기존에 주로 사용되고 있는 천연가스 및 액체연료 뿐만 아니라 유정이나 쓰레기 매립장 등에서 버려지는 낮은 품질의 가스도 연료로 사용할 수 있도록 하여 에너지 활용도를 높일 수 있다. 본문에서는 국내에서 개발중인 65kW급 마이크로터빈 열병합발전 시스템을 소개하고 현재까지의 개발현황을 정리하였다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.389-390
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• 2010

본 논문은 연료전지용 PCS를 계통에 연계하는 과정을 보다 심도있게 진행하기위하여 배전계통을 모의 시뮬레이터로 구현하였다. 제작된 시뮬레이터를 바탕으로 각배전반의 전력품질과 다수 PCS와 계통과의 전력분배를 실험한다.

• Product Safety
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• s.59
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• pp.70-75
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• 1997

석유팬히터를 사용하는 가정이 많아졌다. 연료비가 적게 들어 소비자들이 많이 찾는 상품인 석유팬히터는 올해에도 가전업체마다 새롭고 편리한 기능을 채택한 다양한 종류의 제품을 선보이고 있다. 어느 회사 제품이 좋은지, 5개 회사 제품을 구입해 품질을 테스트했다.

• Journal of the KSME
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• v.50 no.7
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• pp.32-36
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• 2010

에너지 위기를 타개하기 위한 대책은 신재생 에너지의 발굴보다는 기존 화석연료의 절약 및 고효율 사용에 있음을 보였다. 이를 위하여 필요한 구체적 대책들을 에너지 절약 방안과 에너지 품질의 향상이라는 두 가지 측면에서의 논의하였다.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1399-1409
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• 2019

Biodiesel is a renewable and environmentally friendly liquid biofuel for transportation. Insect is considered as a new valuable biomass to convert into biodiesel. In particular, BSF(Black Soldier Fly) containing high fat is a renewable source of biodiesel. Biodiesel drived BSF has high concentration of saturated fatty acid methyl ester and low concentration of polyunsaturted fatty acid methyl ester which makes it potentially an ideal substrate for producing excellent quality biodiesel. Most of the fuel properties of BSF biodiesel were met the requirements of standard EN 14214. BSF have a higher lipid yield and biodiesel productivity as compared to microalgae and vegetable oils. This review paper includes the overall summary and compilation of the insect research conducted on biodiesel production and includes the BSF biodiesel properties.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.5
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• pp.21-30
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• 2008

The fuel cell generation convert fuel source, and gas directly to electricity in an electro-chemical process. Unlike traditional and conventional turbine engines, the process of fuel cell generation do not burn the fuel and run pistons or shafts, and it has not revolutionary machine, so have fewer efficiency losses, low emissions and no noisy moving parts. A high power density allows fuel cells to be relatively compact source of electric power, beneficial in application with space constraints. In this system, the fuel cell itself is nearly small-sized by other components of the system such as the fuel reformer and power inverter. So, the fuel cell energy's stationary fuel cells produce reliable electrical power for commercial and industrial companies as well as utilities. In this paper, a fuel cell system has been modeled using PSCAD/EMTDC to analyze its electric signals and characteristics. Also the power quality of the fuel cell system has been evaluated and the problems which can be occurred during its operation have been studied by modeling it more detailed. Particularly, we have placed great importance on its power quality and signal characteristics when it is connected with a power grid.

• The Transactions of the Korean Institute of Power Electronics
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• v.16 no.4
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• pp.405-414
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• 2011

Recently, the development of several hundreds of kW scale PCS for fuel cell generation is required as commercialization process of distributed generation systems using high temperature fuel cells such as MCFC begins. This paper proposes and optimized topology suitable for MCFC fuel cell generation system and LCL filter design method considering voltage quality of local loads such as MBOP. An interleaving technique is applied to step-up DC-DC converter, optimized number of phases is determined considering efficiency and volume. Also, a LCL filter design method is proposed considering quality of current injected to the grid as well as that of voltage across the local load. The proposed PCS system is validated through reduced 1kW prototype.

• Journal of the Korean Applied Science and Technology
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• v.33 no.1
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• pp.75-82
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• 2016

The technology of fast pyrolysis is regarded as a promising route to convert lignocellulose biomass into bio-oil which can be upgraded to transportable fuels and high quality chemical products. Despite these promises, commercialization of bio-oil for fuels and chemicals production is limited due to its notoriously undesirable characteristics, such as high and changing viscosity, high water and oxygen contents, low heating value and high acidity. Therefore, in this study quality improvement of bio-oil through vaccum distillation had been targeted. A 600 g of cork oak(Quercus variabilis) which grounded 0.8~1.4 mm was processed into bio-oil via fast pyrolysis for 1.64 seconds at $465^{\circ}C$ and temperature of vaccum distillation(100hPa) was designed to control, $40^{\circ}C$, 50, 60, 70, and 80 for 30min. Bio-oil, biochar, and gas of pyrolytic product were produced to 62.6, 18.0 and 19.3 wt%, respectively. The water content, viscosity, HHV(Higher Heating Value) and pH of bio-oil were measured to 0.9~26.1 wt%, 4.2~11.0 cSt 3,893~5,230 kcal/kg and 2.6~3.0, respectively. Despite these quality improvement, production was still limited due to its notoriously undesirable characteristics, therefore continous quality improvement will be needed in order to use practical fuel of bio-oil.

• Transactions of the Korean hydrogen and new energy society
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• v.33 no.4
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• pp.284-292
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• 2022

Hydrogen is promising a candidate for energy supporting the carbon neutrality policy for greenhouse gas reduction, which is being promoted in several countries, including Korea. Although challenging efforts-such as lowering the costs of green hydrogen production and fuel cells-remain, hydrogen fuel cell electric vehicles (FCEVs) are expected to play a significant role in the energy transition from fossil fuels to renewable energy. In line with this objective, the hydrogen FCEV working group in the International Organization for Standardization (ISO) compiled and revised international standards related to hydrogen refueling stations as of 2019. A well-established hydrogen quality management system based on the standard documents will increase the reliability of hydrogen charging stations and accelerate the use of FCEVs. In this study, among the published ISO standards and other references, the main requirements for managing charging stations and developing related techniques were summarized and explained. To respond preemptively to the growing FCEV market, a continuous hydrogen quality monitoring method suitable for use at hydrogen charging stations was proposed.