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송윤호,김형찬,이상규,Song, Yoon-Ho,Kim, Hyoung-Chan,Lee, Sang-Kyu 대한자원환경지질학회 2006 자원환경지질 Vol.39 No.4
1920년대의 온천조사에서부터 현재에 이르기까지 우리나라 지열연구의 역사를 간략히 요약하고, 우리나라의 지열류량 연구 결과 및 추세, 지열의 근원 연구, 그리고 지열에너지 개발 및 활용분야에 대한 연구활동을 정리하였다. 우리나라에서의 지열연구는 1970년대까지 주로 온천조사와 관련되어 있다. 1980년대에 들어서 연구소와 학계에서 온천조사 뿐만 아니라, 지열류량에 대한 연구도 많이 수행하게 되었으며 1996년도에는 우리나라 전국적인 지온경사 분포도와 지열류량 분포도를 발간하게 되었다. 또한 우리나라 온천수에 대한 지화학적 동위원소 분석과 화강암 지대의 열생산율 측정도 1990년대에 주로 이루어졌다. 지열개발과 활용에 대한 시도는 1990년대 초반부터 시도되었으나 실제 개발을 위한 시추로 이어지게 된 것은 2000년대에 들어와서 가능해졌다. 최근의 활발한 심부 지열수 자원 개발이나 천부 지중열을 활용한 냉난방 수요의 증가 등 주변여건이 호전됨에 따라 우리나라 지열연구개발의 전망은 밝다고 판단된다. This paper summarizes the history of geothermal research in Korea since 1920s and also describes the present status of research on heat flow, origin of thermal waters and geothermal exploitation and utilization. Geothermal research in Korea has been mainly related with hot spring investigation until 1970s. 1t was not until 1980s before heat flow study became continuous by research institute and academia and first nation-scale geothermal gradient map and heat flow map were published in 1996. Also in 1990s, geochemical isotope analysis of Korean hot spring waters and measurements of heat production rate of some granite bodies were made. Attempts to develop and utilize the deep geothermal water has been tried from early 1990s but field scale exploitations for geothermal water was activated in 2000s. Considering recent increase of demands on both deep and shallow geothermal energy utilization, outlook on future goethermal research and development is encouraging.
송윤호(Song, Yoon-Ho) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
World geothermal resources potential is estimated to supply 189 EJ annually, which can take charge approximately a half of annual world energy consumpt ion, from considering identified resources and supplies in USA and Iceland. Present annual use of geothermal energy, on the other hand, is only 0.1% of its potential, but still has 70% share among total new renewables. World-wide installed capacity of geothermal power generation reaches 8,900 MWe and 27,825 MWt for direct uses in 2005 which is almost two-fold increase over 2000. This increase is mainly due to exploding expansion of geothermal heat pump utilization: USA and western European countries lead these trends. Although geothermal heat pump distribution in Korea is still in its starting phase, comparing to Swiss achievement in terms of areal utilization sense, we expect to come up with national supply of over 600,000 toe in near future.
송윤호(Song, Yoon-Ho),이영민(Lee, Young-Min) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Geothermal energy is the natural heat of the Earth. Enormous amounts of thermal energy are continuously generated by the decay of radioactive isotopes of underground rocks and stored in the Earth's interior. Therefore, geothermal energy is one of the most important sustainable energy resources. Recent trends of geothermal energy exploitation technologies focus on the Earth scientific approach to geothermal heat pump system, enhanced geothermal system, aquifer thermal energy storage, underground thermal energy storage, and fluid/heat flow model ing for geothermal wells. Geothermal heat pump distribution in Korea is still in its starting phase in terms of areal utilization sense, we, however, expect to come up with national supply of over 1,000,000 toe by 2020
송윤호(Yoon-Ho Song),남기수(Kee-Soo Nam) 한국진공학회(ASCT) 1995 Applied Science and Convergence Technology Vol.4 No.3
비정질실리콘의 고상결정화 및 다결정실리콘의 열산화를 포함한 고온공정으로 제작한 다결정실리콘 박막 트랜지스터의 서프트레시홀드 특성을 연구하였다. 제작된 소자의 전계효과이동도는 60㎠/Vㆍs 이상, 서브트레시홀드 스윙은 0.65 V/decade 이하로 전기적 특성이 매우 우수하다. 그러나, 소자의 문턱전압이 음게 이트전압으로 크게 치우쳐 있으며 n-채널과 p-채널 소자간의 서브트레시홀드 특성이 크게 다르다. 열성장된 게이트 산화막을 가진 다결정실리콘 박막 트랜지스터의 서브트레시홀드 특성을 다결정실리콘 활성층내의 트랩과, 게이트산화막과 다결정실리콘 사이의 계면 고정전하를 이용하여 모델링하였다. 시뮬레이션을 통하여 제안된 다결정실리콘의 트랩모델이 실험결과를 잘 설명할 수 있음을 확인하였다. The subthreshold characteristics of polycrystalline silicon (poly-Si) thin-film transistors (TFTs) fabricated by using high-temperature process, including solid phase crystallization of amorphous Si and thermal oxidation of poly-Si, have been studied. The devices show high performances with a field effect mobility higher than 60 ㎠/Vㆍs and a subthreshold swing lower than 0.65 V/decade. However, the threshold voltages of the devices are strongly shifted toward the negative gate voltage and there are prominent differences in the subthreshold characteristics of the n-channel and p-channel poly-Si TFTs. The subthreshold characteristics of the poly-Si TFTs with thermally gown gate oxide was modeled by traps in the bandgap of poly-Si active layer and fixed charge density at the interface between gate oxide and poly-Si. Simulation showed that the proposed trap model of poly-Si could explain the experimental results very well.
송윤호(Song, Yoon-Ho) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
International Geothermal Association (IGA) and Geothermal Implementing Agreement (GIA) under Committee on Energy Research & Technology (CERT) of International Energy Agency (IEA) are the two major international organizations leading geothermal research, development and deployment (RD&D). IGA has been established in 1988 by geothermal societies in Europe and America and presently consists of 23 affiliated societies. Current number of members of IGA reaches 2,000 from 65 countries and its most important activity may be to organize the World Geothermal Congress (WGC) every five years. IEA-GIA has been established in 1993 and its executive committee (ExCo) consists of 11 countries, 1 organization (EC) and 3 sponsor companies. Korea became a member of ExCo on September 2005 through Korea Institute of Geoscience & Mineral Resources (KIGAM) as representative. KIGAM is also actively participating in Direct Use Annex through a task leader of several tasks.
송윤호(Song, Yoon-Ho),이영민(Lee, Young-Min),이태종(Lee, Tae-Jong) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Assessment of geothermal resources like other earth resources is a starting point for decision makers or stakeholders to set up basic plan on its development and R&D policies. In this context, there have been various works on world geothermal assessment, to report different estimates from each other. In this paper, we first introduce the definition of geothermal potential mainly adopted from the article by Muffler and Cataldi (1978) and then summarize the estimates made so far referring the work by Bertani (2003). An updated estimates by Stefansson (2005) are also reviewed in terms of identified resources separately for high-temperature resources for power generation and low-temperature ones for direct-use. Recent estimate of US geothermal resources by MIT (2006) using a volumetric method with extensively accumulated data base is discussed. Finally, we introduce the first geothermal assessment in Korea recently made and discuss its importance.
초기 지중온도 측정이 지중 열교환기 설계에 미치는 영향
송윤호(Song, Yoon-ho),김성균(Kim, Seong-Kyun),이강근(Lee, Kang-Kun),이태종(Lee, Tae-Jong) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
We compared relative importance of thermal conductivity and initial ground temperature in designing borehole heat exchanger network and also we test accuracy of ground temperature estimation in thermal response test using a proven 3-D T-H modeler. The effect of error in estimating ground temperature on calculated total length of borehole heat exchanger was more than 3 times larger than the case of thermal conductivity in maximum 20% error range. Considering 10% of error in estimating thermal conductivity is generally acceptable, we have to define the initial ground temperature within 5% confidence level. Utilizing the mean annual ground surface temperature and the geothermal gradient map compiled so far can be a economic way of estimating ground temperature with some caution. When performing thermal response test for estimating ground temperature as well as measuring thermal conductivity, minimum 100 minutes of ambient circulation is required, which should be even more in case of very cold and hot seasons.