• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.3-4
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• 2007

Many electrochemical power devices such as solid state batteries and solid oxide fuel cell have been studied and developed for solving energy and environmental problems. 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. This paper offers some new perspectives on fuel cell development and commercialization which come from the broad consideration of the commercialization efforts of the entire fuel cell industry.

• Strategy21
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• 통권36호
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• pp.121-149
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• 2015

This paper will examine some past and current issues concerning the Republic of Korea's national strategy, focusing predominantly upon how the ROK should respond to the urgent maritime-oriented strategy highlighted by the recent developments and achievements of national prosperity achieved during last three decades and identify some of successful cases in East Asia. Some consideration will also be given to more general emergent issues of trends and developments of East Asian countries which might affect to define the ROK's future national strategy in the context of its national grand strategy to enhance national interests and prosperity. ROK is especially dependent upon open Sea Lanes of Communication (SLOC) and its national security emphasizes the sea as the medium of geopolitical and geo-economic development, given the sea known as core geographic option remains that ROK is an important maritime power, ranking the world-level nation in term of GDP, sea-borne trade, container processing capability, shipbuilding capacity and so on. It should be apparent, therefore, that ROK's national strategic development depends upon the relationship between its peninsula geography and its national development based on sea-borne economic growth and its maritime-oriented future national strategy will be the best option to maintain its national development and economic prosperity.

• Advances in environmental research
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• 제1권2호
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• pp.125-142
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• 2012

Clean development mechanism (CDM) validity study was conducted to suggest better and more adaptable CDM scenario on water treatment plant (WTP). Potential four scenarios for CDM project; improvement of intake pumping efficiency, hydro power plant construction, solar panel construction and system optimization of mechanical mixing process were evaluated on S-WTP in Korea. Net present value (NPV) of each scenario was estimated based on sensitivity analysis with the variable factors to investigate the CDM validity percentile. Hydro power plant construction was the best option for CDM business with 97.76% validity and $1,127,069 mean profit by 9,813 $tonsCO_2e$/yr reduction. CDM validity on improvement of intake pumping efficiency was 90.2% with $124,305 mean profit by huge amount of $CO_2$ mitigation (10,347 $tonsCO_2e$/yr). System optimization of mechanical mixing process reduced 15% of energy consumption (3,184 $tonsCO_2e$/yr) and its CDM validity and mean profit was 77.25% and $23,942, respectively. Solar panel construction could make the effect of 14,094 $tonsCO_2$ mitigation annually and its CDM validity and mean profit was 64.68% and $228,487, respectively.

• 한국연소학회지
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• 제22권1호
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• pp.14-22
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• 2017

Co-firing of renewable fuel in coal fired boilers is an attractive option to mitigate $CO_2$ emissions, since it is a relatively low cost option for efficiently converting renewable fuel to electricity by adding biomass as partial substitute of coal. However, it would cause reducing plant efficiency and operational flexibility, and increasing operation and capital cost associated with handling and firing equipment of renewable fuels. The aim of this study is to investigate the effects of biomass co-firing on $CO_2$ emission and capital/operating cost. Wood pellet, PKS (palm kernel shell), EFB (empty fruit bunch) and sludge are considered as renewable fuels for co-firing with coal. Several approaches by the co-firing ratio are chosen from previous plant demonstrations and commercial co-firing operation, and they are evaluated and discussed for $CO_2$ reduction and cost estimation.

• Nuclear Engineering and Technology
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• 제55권10호
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• pp.3559-3570
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• 2023

In the decommissioning of nuclear facilities, Derived Concentration Guideline Level (DCGL) derivation is necessary for the release of the facility after the site remediation, which also needs to be implemented in the stage of establishing a decommissioning planning. In order to derive DCGL, the dose assessment for the receptors can be conducted from residual radioactivity by using RESRAD code. When performing sensitivity analysis on probabilistic parameters, secondary evaluation is performed by assigning a single value for parameters classified as sensitive. However, several options may arise in the handling of nonsensitive parameters. Therefore, we compared the results of the first execution of RESRAD applying probabilistic parameters for each scenario with the results of the second execution applying a single value to sensitive parameters among the probabilistic parameters. In addition, we analyzed the effect of setting options for non-sensitive parameters. As a result, the effect on DCGL were different depending on the application scenario, the target radionuclides, and the input parameter selections. In terms of the overall evaluation period, the DCGL graph of the default option was generally shown as the most conservative except for some radionuclides. However, it will not necessarily be given priority in the aspect of the need to reflect site characteristics. The reason for selecting a probabilistic parameter is the availability of the parameter and the uncertainty of applying a single value. Therefore, as an alternative, it can be consistently applied to distribution as an option for non-sensitive parameters after sensitivity analysis.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1769-1773
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• 1996

The remaining life of generator stator winding has been the controversial issue amomg many experts in this area. The report from Japan claims that they can predict the remaining life of generator winding, while the North American has the negative opinion about it. This study aimed at verifying the validity of both Japanese criteria and North American argument on evaluation of generator winding insulation. Non destructive and destructive tests were performed on two hydro-generators. The test results showed that the trend analysis of stator winding insulation was the better option.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.1298-1300
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• 1996

The application field of photovoltaic system which has no-pollution and no-fuel distinctives is being spreaded inspite of its high installation cost. At present, there are three PV systems within the country, which were already installed and have been operated to supply the electric power in remote island. In this paper, the electrification plan of our government on the unelectrified or subelectrified islands is introduced, and the operation results of three PV systems are investigated to discuss the diffusion possibility of PV system as a power supply option.

• Journal of Power Electronics
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• 제10권4호
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• pp.444-449
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• 2010

The generation of electric power using self excited induction generation (SEIG) is a viable option in remote and rural areas where grid electricity is not available. The generated voltage and frequency of these machines, however, varies with varying loads. This characteristic can be resolved either by adjusting the values of the excitation capacitance or by controlling the prime mover speed. Further, in a single-point constant power application, where the machines deliver a fixed amount of power, the electronic load controller (ELC) can be used to switch-in or switch-out a dump load whenever the consumer load decreases or increases respectively. This paper presents a detailed analysis and the design of a microcontroller based SEIG -ELC system intended for stand-alone pico hydro power generation. The simulated performance of the controller is supplemented by experimental results.

• 한국콘텐츠학회논문지
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• 제13권12호
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• pp.369-378
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• 2013

원-달러 장외 외환 시장은 1990년말 외환위기 및 2008년 서브프라임 위기때 극심한 변동성을 보였으므로 변동성 연구에 적합한 특성을 띤다. 본고는 ARCH 모형에 기반해 옵션 가격 결정 모형을 제시한 Duan, Heston and Nandi의 GARCH 모형으로 외환 옵션 시장에서 변동성의 특성이 옵션 가격에 반영되는 정도를 분석해 보았다. 2006년 5월부터 2013년 1월까지 원-달러 장외시장에서 거래되는 옵션 자료에 대해 본고는 세 가지 모형(Black and Scholes, Duan, Heston and Nandi)간의 설명력을 비교했다. 최우추정법으로 계산된 모수를 고정하고 전일 내재 변동성을 이용하여 당일의 이론 가격을 구해 오차를 계산하면 Duan 및 Black and Scholes 모형 모두 약 0.1% 수준을 보인다. 다만 Heston and Nandi는 상기 두 모형에 비해 큰 오차값을 가지며 또한 만기가 길어지면 설명력이 약해진다. 따라서 원-달러 외환 옵션시장의 경우 Duan 또는 Black and Scholes 모형을 이용하여 가치를 측정하는 것이 유용할 것으로 사료된다. 또한 정책적 시사점으로는 외환 현물 시장의 과거 변동성 평균이 14% 전후에서 형성되었으므로 내재 변동성 5%전후에서 외환 옵션 등을 매매하는 것은 매도자에게 대규모 손실을 초래할 수 있다.

• 한국산림과학회지
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• 제110권3호
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• pp.453-461
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• 2021

기후변화 대응과 탄소중립 실현을 위해 산림 바이오매스의 에너지 이용은 중요한 과제이다. 이 연구의 목적은 목재칩 보일러를 주력으로 사용하는 산림에너지자립마을의 투자 타당성을 분석하고 시설의 지속적 운영을 위해 필요한 적정열 보조금 수준을 산출하는 데 있다. 분석을 위해 순현재가치법과 선택의 유연성을 고려한 콜옵션 가격결정모형을 이용하였다. 분석결과에 따르면, 현재와 같이 국비 50%를 지원하고 전력에만 REC를 인정하면 산림에너지자립마을의 순현재가치와 내부수익률은 모두 음(-)이며, 실물옵션 모형으로 평가한 투자가치도 0으로 나타났다. 따라서 에너지 시설의 지속적 가동을 위해 정부 보조금이 필요하다. 시뮬레이션을 통해 사업의 옵션가치를 0보다 크게 만드는 열보조금 수준을 도출하였는데, 최소 0.0248원/kcal으로 나타났다.