• 한국전기전자재료학회논문지
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• 제27권12호
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• pp.863-865
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• 2014

Energy problem has been issued in worldwide because fossil fuel has being almost exhausted. A lot of renewable energy have been received attention to replace the energy from fossil fuel. Among them, piezoelectric energy harvester is one of excellent candidates. In general, micro scaled small sized energy harvesters were usually based on the lithography process. However, these lithography process require complicated process and high cost. In this paper, a new process has been proposed for micro-scaled piezoelectric energy harvester. $0.2Pb(Mg_{1/3}Nb_{2/3})O_3-0.8Pb(Zr_{0.52}Ti_{0.48})O_3$ composition was used as piezoelectric material due to excellent piezoelectric properties and also can be easily prepared by mixed oxide method.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.341-344
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• 2004

This paper presents results of test for combustion vibration in the pilot furnace for fossil power plant under combustion test. We measured static pressure variation in the pilot furnace together with air and fuel flow. From test results, it shows that vibration magnitude is affected by air and fuel flow. Also, a finite element analysis using a commercial S/W is performed to calculate acoustic mode of the pilot furnace. These results show that dominant frequency occurred is related to acoustic natural frequency of furnace. After this, it needs to be studied the relation between dominant frequency of combustion vibration and air flow rate.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2011년도 추계학술논문집 1부
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• pp.342-344
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• 2011

본 논문에서는 최근에 주목 받고 있는 물질인 이온성액체를 실험실 규모로 제조하여 회분식 기-액흡수평형(VLE)장치를 이용하여 압력에 따른 이산화탄소 용해도 및 초기흡수속도를 상용 이온성액체인 PF6와.비교분석 하였다. 반응온도 $40^{\circ}C$조건에서 운전하였으며, 이산화탄소 압력 0~40기압 범위에서 수행되었다. 실험결과 [beim] ethyl sulfite 합성 이온성액체가 초기흡수속도에서 상용 이온성액체인 $PF_6$ 보다 높은 흡수력을 보였다.

• 한국수소및신에너지학회논문집
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• 제30권1호
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• pp.35-42
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• 2019

Recently, the gradual increase in energy acceptance is mostly satisfied by fossil fuels, but research and development of renewable energy sources are attracting attention due to fossil fuel supply and greenhouse gas problem. The disadvantage is that renewable energy can not be produced continuously. This being so, energy storage is an important technology in renewable energy. In this study, microwave was used to convert carbon receptor-carbon dioxide to gas fuel.

• Design & Manufacturing
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• 제16권2호
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• pp.20-25
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• 2022

In line with the rapid economic growth of many countries, fossil fuel energy sources are also rapidly depleting. Therefore, the price is also rising rapidly, so it is necessary to develop new and renewable energy sources such as hydropower, geothermal power, nuclear power, wind power and solar energy to replace fossil fuel energy in the future. In this study, development of rotating concentrator module system, development of rotating module control control system, development of lamp and charge control controller, configuration and prototype production of rotating concentrating solar LED street light system, efficiency of rotating concentrating solar LED street light, and power production. The research was conducted in the order of evaluation of comprehensive performance tests such as consumption and consumption. As a result, the developed high-efficiency rotation-concentrating hybrid solar LED street light module system has a 50% higher light-gathering efficiency than existing products by tracing sunlight by self-developing a rotation-collecting module on existing solar LED street lamps according to the characteristics of Korea's topography. and the power generation was improved by more than 40%.

• 한국가스학회지
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• 제19권6호
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• pp.34-39
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• 2015

최근 차량용 에너지의 소비는 대부분 화석연료로부터 사용된다. 기존 화석 연료를 사용하는 자동차보다 친환경적이며 저렴하고 재생이 가능한 연료의 요구증대로 대체연료 자동차산업이 강조되고 있다. 오늘날 고옥탄가와 높은 자기발화온도 특징을 가지고 있는 천연가스는 저렴한 비용, 기존 화석연료보다 풍부한 매장으로 기존 스파크 점화엔진인 가솔린엔진의 대체에너지로 간주되고 있다. 본 연구는 기존 2리터 가솔린 엔진에 CNG 가스 분사시스템을 장착하여 전소 및 혼소 연료분사시스템을 설치하였다. 또한 CNG전소 및 가솔린/CNG 혼소차량의 ECU 제어전략을 최적화 하였다. 혼소차량에 대하여 NEDC모드 주행결과 가솔린 차량 대비 혼소차량의 CO2 저감율을 16%확인하였다. 또한 CO와 HC의 배기가스 배출량은 가솔린 차량과 동등한 수준을 확보하였다. 하지만 NOx의 배기가스 배출수준은 증가된 현상을 확인할 수 있었다.

• Journal of Mechanical Science and Technology
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• 제16권10호
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• pp.1287-1295
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• 2002

In this work, the fuel economy of a parallel hybrid electric vehicle is investigated. A vehicle control algorithm which yields operating points where operational cost of HEV is minimal is suggested. The operational cost of HEV is decided considering both the cost of fossil fuel consumed by an engine and the cost of electricity consumed by an electric motor. A procedure for obtaining the operating points of minimal fuel consumption is introduced. Simulations are carried out for 3 variations of HEV and the results are compared to the fuel economy of a conventional vehicle in order to investigate the effect of hybridization. Simulation results show that HEV with the vehicle control algorithm suggested in this work has a fuel economy 45% better than the conventional vehicle if braking energy is recuperated fully by regeneration and idling of the engine is eliminated. The vehicle modification is also investigated to obtain the target fuel economy set in PNGV program.

• 동력기계공학회지
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• 제19권3호
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• pp.29-35
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• 2015

Environmental pollution is produced by consumption of fossil fuel, therefore alternative fuels is interested for development of new energy resources and reduction of exhaust emissions for air pollution prevention. Biofuels are produced from new vegetable oil and animal fat, may be used as fuel without change of engine structure in diesel engine. In this paper, the test results on specific fuel consumption, combustion characteristics of neat diesel oil and biodiesel blends(10 vol.% biodiesel and 20 vol.% biodiesel) were presented using four stroke, direct injection diesel engine, especially this biodiesel was produced from biodiesel fuel at our laboratory by ourselves. This study showed that specific fuel consumption is increased slightly, on the other hand cylinder pressure, rate of pressure rise, rate of heat release and soot were decreased slightly in the case of biodiesel blends than neat diesel oil.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.154-157
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• 2009

Fuel cell is spotlighted as next energy source of future. The fuel of vehicle will be changed from fossil fuel such as gasoline, diesel to hydrogen. Polymer electrolyte membrane fuel cell(PEMFC) will be used to fuel cell vehicle because of its suitability. PEMFCs need oxygen for cathode. Because PEMFCs in vehicle use air for oxygen, air pollutant will be effect to performance of PEMFC. In this study, we examine a type of filter and pollutant gas how can be effect to performance of fuel cell electric vehicle.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.510-511
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• 2008

Fuel cell is a modular, high efficient and environmentally energy conversion device, it has become a promising option to replace the conventional fossil fuel based electric power plants. The high temperature fuel cell has conspicuous feature and high potential in being used as an energy converter of various fuel to electricity and heat. And, The research and development for the solid oxide fuel cell have been promoted rapidly and extensively in recent years, because of their high efficiency and future potential. Therefore this paper describes the manufacturing method and characteristics of anode electrode for solid oxide fuel cell, by the way, Ni-YSZ materials are used as anode of high temperature widely. So in this experiments, we investigated the optimum content of Ni, by the impedance characteristics, overvoltage. As a result, the performance of Ni-YSZ anode(40vol%) was better excellent than the others.