• 한국정보전자통신기술학회논문지
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• 제15권2호
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• pp.178-188
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• 2022

탄소중립 달성의 핵심인 분산형 재생에너지의 확산에 따라 발생하는 계통수용성 문제의 해결을 위해 가상발전소의 도입이 활발히 논의되고 있다. 하지만 가상발전소와 같은 신사업은 일반적으로 보상 메커니즘이 존재하지 않아 도입 초기의 경제성 확보가 어렵다. 이에 조기 활성화를 위해서는 보조금을 포함한 적절한 지원이 필요하다. 지원 수준의 결정을 위해서는 비용모델이 필요하나 신사업의 경우 충분한 데이터가 부족한 문제가 있다. 본 연구에서는 국내 전문가를 대상으로 가상발전소 도입에 필요한 요건, 적정 규모와 비용에 대한 설문을 통하여 비용 추정 모델을 도출하였다. 우선 가상발전소의 자원구성 형태가 비용에 미치는 영향을 고려하여 설문조사에 따라 자원구성 시나리오를 설계하였다. 각자의 자원구성 시나리오에 대한 비용추계를 기반으로 로지스틱회귀분석을 통하여 시나리오에 따른 비용 추정 모델을 도출하였다. 가상발전소 규모와 자원구성 시나리오에 따른 사례분석으로 적절한 초기 보상 규모를 비교 분석하였다. 20MW~500MW 규모의 가상발전소에서 중대형 위주와 소형 자원을 포함한 자원구성 시나리오를 적용하였을 때, 중대형 위주의 구성 시 비용이 29~51% 낮게 나타났다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.169.1-169.1
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• 2010

Due to global warming, the need to secure an alternative resource has become the international issue. Not like other renewable energy sources, TCP is the high reliable and predictable and continuous energy source as the current pattern and speed can be predicted throughout the year. Having very strong tidal current speeds, there are many suitable site for the application of TCP (Tidal Current Power) on the west and south coastal region in Korea. The maximum current speed in the south is recorded up to 6.5m/s. Due to the high tidal current speed on the west coast of Korea, numerous tidal current projects are being planned. To extract a significant quantity of power, a tidal current farm with number of devices is required in the ocean. However, it is important to estimate the potential quantity of energy in the area. Also the realistic quantity that can be extracted is to be investigated. Based on the estimated energy production considering the number of devices and the interactional effects, system type, the water depth and etc., the cost of the development and the benefit from SMP can be estimated. The feasibility study for the 200MW tidal in Incheon, Korea has been performed recently. Based on the actual feasibility study, the procedure and the key points for the application of tidal current power farm are introduced in the paper.

• 태양에너지
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• 제18권1호
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• pp.3-18
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• 1998

1994년부터 발효된 UN 기후변화협약은 지구온난화의 방지를 위해서 각국의 자발적인 이산화탄소 배출 저감을 의무 사항으로 규정하고 있다. 우리 나라도 21세기에 들어서면 본격적으로 이산화탄소 배출 저감을 추진해야 할 것으로 예상되지만 에너지 절약의 측면에서나 대체에너지 개발의 측면에서 다른 나라들보다 상황이 크게 불리한 입장에 있다. 기후변화협약에 대비하는 한 대안으로 태양에너지를 이용할 필요성이 상당히 증대될 것이기 때문에 앞으로 태양에너지 관련 기술에 대한 수요는 현재보다 상당히 높아질 것으로 예상된다. 이런 점을 감안해서 본고에서는 먼저 기후변화협약의 내용들을 살펴보고 이에 대응하는 수단으로서 태양에너지 기술 개발의 전망을 포괄적으로 검토하였다. 특히 우리 나라에서는 고효율 태양전지의 대량 생산 기술과 태양열 이용 온수기 및 난방 시설의 효율 증진 기술 등이 유망하다고 전망되었다.

• 신재생에너지
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• 제8권2호
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• pp.24-32
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• 2012

Natural gas hydrates have a high potential as the 21st century new energy resource, because it have a large amount of deposits in many deep-water and permafrost regions of the world widely. Natural gas hydrate is formed by physical binding between water molecule and gas mainly composed of methane, which is captured in the cavities of water molecules under the specific temperature and pressure. $1m^3$ methane hydrate can be decomposed to the methane gas of $172m^3$ and water of $0.8m^3$ at standard condition. Therefore, there are a lot of practical applications such as separation processes, natural gas storage transportation and carbon dioxide sequestration. For the industrial utilization of methane hydrate, it is very important to rapidly manufacture hydrate. However, when methane hydrate is artificially formed, its reaction time may be too long and the gas consumption in water becomes relatively low, because the reaction rate between water and gas is low. So in this study, hydrate formation was experimented by adding natural zeolite and Synthetic zeolite 5A in distilled water, respectively. The results show that when the Synthetic zeolite 5A of 0.01 wt% was, the amount of gas consumed during the formation of methane hydrate was higher than that in the natural zeolite. Also, the natural zeolite and Synthetic zeolite 5A decreased the hydrate formation time to a greater extent than the distilled water at the same subcooling temperature.

• 신재생에너지
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• 제9권2호
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• pp.15-22
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• 2013

The solar energy are an infinite source of energy and a clean energy without secondary pollution. The global solar energy reaching the earth's surface can be calculated easily according to the change of latitude, altitude, and sloped surface depending on the amount of the actual state of the atmosphere and clouds. The high-resolution solar-meteorological resource map with 1km resolution was developed in 2011 based on GWNU (Gangneung-Wonju National University) solar radiation model with complex terrain. The very high resolution solar energy map can be calculated and analyzed in Seoul and Eunpyung with topological effect using by 1km solar-meteorological resources map, respectively. Seoul DEM (Digital Elevation Model) have 10m resolution from NGII (National Geographic Information Institute) and Eunpyeong new town DSM (Digital Surface Model) have 1m spatial resolution from lidar observations. The solar energy have small differences according to the local mountainous terrain and residential area. The maximum bias have up to 20% and 16% in Seoul and Eunpyung new town, respectively. Small differences are that limited area with resolutions. As a result, the solar energy can calculate precisely using solar radiation model with topological effect by digital elevation data and its results can be used as the basis data for the photovoltaic and solar thermal generation.

• 전기학회논문지
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• 제66권4호
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• pp.605-612
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• 2017

One of the biggest environmental issues that our world has been facing is climate change. In order to cope with such environmental issues, the world is putting a great deal of effort into energy conservation. The building sector, in particular, consumes 36% of the energy consumed worldwide and emits considerable amount of greenhouse gases. Therefore, introduction of renewable energies in the building sector is highly recommended. Renewable energy sources that can be utilized in the building sector include sunlight, solar heat, geothermal heat, fuel cells and wind power. The wind power generation system which converts wind energy into electrical energy has advantages in that wind is an unlimited and pollution-free resource. It is suitable to be connected to existing buildings because many years of operational experience and the enhanced stability of the system have made it possible to downsize the electrical generator. In case of existing buildings, it is necessary to consider the live loads of the buildings to connect the wind power generation system. This paper, through the connection of the wind power generation with existing buildings, promotes reduction of greenhouse gas emissions and energy independence by reducing energy consumption in the building sector. In order to connect the wind power generation system with an exciting building, the live load of the building and the area of the rooftop should be considered. The installable model is selected by comparing the live load of the building and the load of the wind power generation system. The maximum number of the wind turbines that can be installed is obtained by considering the separation distance between the wind turbines within the area of the rooftop. Installations are divided into single installations and multiple installations of two different types of wind turbines. After determining the maximum installable number, the optimal model that can achieve the maximum annual power generation will be selected by comparing the respective total annual amount of the power generation of different models.

• 한국물환경학회지
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• 제29권5호
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• pp.591-597
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• 2013

The input emergy of an advanced treatment plant for reducing the 1 kg of TN and TP was estimated 4.14E+14 sej/kg, 5.02E+15 sej/kg, respectively. In addition, the input emergy of constructed wetland for reduction of the 1 kg of TN and TP reduction was estimated to be 2.48E+14 sej/kg, 3.38E+15 sej/kg, respectively. The cost reducing 1 kg of TN and TP for an advanced treatment plant was estimated 197,466 won and 2,388,739 won respectively and constructed wetland was estimated 117,976 won and 1,609,213 won respectively. As a result, All of the emergy source of constructed wetland for reducing non-point source is renewable resource. If we use the constructed wetland, it results in enhancing economic value by reducing of non-point pollution, controlling a flood and providing the habitat of animals or plants. Improving water quality program in the Nakdong River Basin should be changed into an ecological treatment facilities from expansion of the sewage treatment facilities and advanced treatment plant using high cost and non-renewable energies.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권3호
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• pp.41-50
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• 2015

Hydrogeologic environment of the Mega City such as Seoul, suffers from rapid changes caused by urbanization, construction of underground subway or buildings, and contaminant loading by diverse anthropogenic activities. Understanding the present condition of groundwater environment and water budget is necessary to prevent natural and manmade disasters and to prepare for sustainable water resource management of urban environment. In this study, regional groundwater flow and water budget status of Seoul was analyzed using numerical simulation. Modeling result indicated that groundwater level distribution of Seoul generally followed the topography, but the significant decreases in groundwater level were observed around the subway network. Steady-state water balance analysis showed groundwater recharge by rainfall and leakage from the water supply network was about 550,495 m³/day. Surface water inflow and baseflow rate via Han River and major streams accounted for 799,689 m³/day and 1,103,906 m³/day, respectively. Groundwater usage was 60,945 m³/day, and the total groundwater leakage along the subway lines amounted to 114,746 m³/day. Modeling results revealed that the subway could decrease net groundwater baseflow by 40%. Our study result demonstrated that the subway system can have a significant influence on the groundwater environment of Seoul.

• 한국전자통신학회논문지
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• 제13권1호
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• pp.35-44
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• 2018

우리나라 정부는 화력과 원자력발전소를 줄이고 2030년까지 깨끗한 재생에너지 전기를 20% 생산하는 목표를 갖고 있다. 태양에너지는 기술적으로 전 세계 에너지수요를 초과하는 잠재자원이다. 비용절감을 가져오는 기술적인 진보 및 재생에너지 개발과 활용을 위한 정부정책에 힘입어 태양에너지산업은 최근 괄목할만한 성장을 가져오고 있다. 비록 태양광발전은 다른 전력생산 방식보다 많은 장점을 가지고 있음에도 불구하고 주요 문제는 이용할 수 있는 현장과 적절한 비용을 갖춘 부지가 많지 않다는 것이다. 본 연구에서는 전라남도 지역을 대상으로 설치 가능한 육상 및 수상태양광 용량을 분석하고자 한다. 연구결과 설계용량은 육상풍력 약 7.5GW와 수상태양광 약 1.5GW를 갖는다. 또한, 지역주민과 이해간격을 줄이기 위한 목적으로 설득에 필요한 여러 가지 해결방법을 제시하였다.

• 한국농공학회논문집
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• 제57권6호
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• pp.9-20
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• 2015

The demand of renewable energy is expected to grow in the long run in spite of current stable lower oil prices. Energy consumption for heating in horticulture greenhouse is large and affects the profits of the farms. This study analyzed the availability of biomass in rural area and proposed the strategies for utilizing the biomass for greenhouse heating. Data reveal the annual average fuel consumption in greenhouses is about 78 TOE/ha. Considering biomass resource in rural areas, agricultural residues are not sufficient to meet the biomass demand from greenhouses. Therefore it is recommended to secure further biomass including wild herbaceous biomass and woody biomass from forest. Based on the conditions of biomass gasification equipment investment and fuel prices, maximum allowable price of biomass turned out about 100,000 KRW/t to be competitive to kerosine. Biomass supply chain should be established for facilitating biomass trading between biomass consumers and biomass producers such as farmers who provide crop residues. An online trading system is an example of the system where consumers who utilize biomass make payments to suppliers and get the information about the biomass. Intermediate collection storages are required to store biomass from distributed sources. Operation of biomass heating systems in demonstration greenhouses is necessary to get information to refine and further develop commercial biomass heating systems. Relatively large greenhouses are desirable to have biomass heating systems for economic viability. The location of the greenhouse farms should be selected within the area where enough biomass resources are available for feeding the biomass facility.