• Ocean Systems Engineering
• /
• 제13권1호
• /
• pp.21-41
• /
• 2023

Decarbonization and energy transition can be considered as a main concern even for the oil industry. One of the initiatives to reduce emissions under studies considers the use of renewable energy as a complimentary supply of electric energy of the production platforms. Wind energy has a higher TRL (Technology Readiness Level) than other types of energy converters and has been considered in these studies. However, other types of renewable energy have potential to be used and hybrid concepts considering wind platforms can help to push the technological development of other types of energy converters and improve their efficiency. In this article, a preliminary hydrodynamic assessment of a new concept of hybrid wind and wave energy conversion platform was performed, in order to evaluate the potential of wave power extraction. A multiple OWCs (Oscillating Water Column) WEC (Wave Energy Converter) design was adopted for the analysis and some simplifications were adopted to permit using a frequency domain approach to evaluate the mean wave power estimation for the location. Other strategies were used in the OWC design to create resonance in the sea energy range to try to maximize the potential power to be extracted, with good results.

• 전기화학회지
• /
• 제11권4호
• /
• pp.227-241
• /
• 2008

This article involves a unified treatment of equilibrium thermodynamics of the chemical reaction coupled with other interfacial (phase boundary) reactions. The modified (restrictive) chemical potential ${\mu}_k^+$, such as electrochemical potential, hydrostatic-chemical (mechanochemical) potential (exceptionally in the presence of the pressure difference) and surface-chemical potential, was first introduced under the isothermal and isobaric conditions. This article then enlightened the equilibrium conditions in case where the release of chemical energy is counterbalanced by the supply of electrical energy, by the supply of hydrostatic work (exceptionally in the presence of ${\Delta}p$), and finally by the release of surface energy, respectively, at constant temperature T and pressure p in terms of the modified chemical potential ${\mu}_k^+$. Finally, this paper focussed on the difference between chemical and electrochemical equilibria based upon the fundamentals of the isothermal and isobaric equilibrium conditions described above.

• 한국환경과학회지
• /
• 제6권4호
• /
• pp.313-322
• /
• 1997

한국수영만에서 잔차류장의 운동 위치에너지의 계절변화를 연구하기 위하여 우리는 에너지의 수지를 계산하고 조석에너지와 비교했다. 위치에너지는 겨울과 봄철에 크며, 밀도성층이 형성된 여름과 초가을에 작게 나타났다. 잔차류의 운동에너지는 계절적인 변화를 보이고 있으며, 단위면 적당 잔차류의 평균 운동에너지는 6.4$\times$$10^{-4}ergs s^{-1}cm^{-}2$이다. 수영 만에서 잔차류장의 계절변동은 조석잔차류의 운동에너지가 밀도류나 취송류의 운동에너지보다 큰 11월을 제외하고는 밀도류가 지배하고 있다. 잔차류의 주성분인 조석잔차류, 취송류 및 밀도류의 운동에너지의 평균백분율은 잔차류의 운동에너지에 대하여 각각 29.1%, 3.4%, 67.5% 이다. 단위면적당 잔차류의 운동에너지, 위치에너지 및 조석에너지의 비는 각각 1.0 : 6.7$\times$$10^3$ : 8.2$\times$$10^4$ 이다.

• 한국환경과학회지
• /
• 제15권5호
• /
• pp.493-501
• /
• 2006

The increase in environmental loads and energy consumptions has resulted in the need of developed new forms of energy for a sustainable use for the society. Recently, the viability of using unused energy has attracted a great deal of attention. From the view point of using unused energy, the most critical problem can be referred to as the distance between the heat source/sink and heat demand area. The water resource in the city water system was used to solve this distance problem with unused energy. The calculation method of the potential use unit was used to survey the potential of the water resource in the city water system. The amount of theoretical unused energy and energy savings in the model city were estimated using this method. It is estimated that the amounts of energy savings and $CO_2$ reduction correspond to 131.3 GWh and 29280[t-C], respectively, per annual basis.

• 한국정보통신학회논문지
• /
• 제8권3호
• /
• pp.670-678
• /
• 2004

한의학에서 경락은 생체에너지의 전달 통로이며, 진단치료의 기본대상이다. 그러나 서양의학에서는 경락을 신경-면역계통의 활동통로로 간주하고 있다. 침구치료 효과를 단순한 자극에 의한 인체의 반응으로 간주하고 있다. 본 논문에서는 시술자의 생체에너지가 전달될 때와 전달되지 않을 때, 즉 절연자침과 비절연자침을 시행하였을 경우, 경락과 비경락에서의 전위를 측정하였다. 그 결과 비절연자침 시행시에는 각 시술에 대한 반응이 뚜렷하게 나타나고 있으나 절연자침 시행시에는 첫 번째 자침 시술에만 반응하였다. 이는 침구치료의 효과가 단순한 침자극에 의한 효과라기 보다는 시술자의 생체에너지 전달과 더 밀접한 관계가 있음을 의미한다. 따라서, 침 자극에 의한 생체에너지 전달에 의한 인체의 반응을 전위의 변화로 분석하여 침구치료효과를 규명하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1997년도 하계학술대회 논문집 D
• /
• pp.917-919
• /
• 1997

Recently, electric industry confront a strategical change and high competiveness environment in the course of deregulation. Especially, rapid growth in electricity demand, financial need for new power plant construction, and environmental problems have led to search for more efficient energy production and energy conservation technologies in Korea. Due to the potential energy and cost savings, DSM(Demand-Side Management) plays and important role in the electric resource planning. In this paper, we suggest DSM potential evaluation procedures and algorithm. Also, we present screening analysis methods for DSM potential evaluation.

• Bulletin of the Korean Chemical Society
• /
• 제34권11호
• /
• pp.3425-3428
• /
• 2013

We solve the Klein-Gordon equation with the Morse empirical potential energy model. The bound state energy equation has been obtained in terms of the supersymmetric shape invariance approach. The relativistic vibrational transition frequencies for the $X^1{\sum}^+$ state of ScI molecule have been computed by using the Morse potential model. The calculated relativistic vibrational transition frequencies are in good agreement with the experimental RKR values.

• EDISON SW 활용 경진대회 논문집
• /
• 제2회(2013년)
• /
• pp.193-202
• /
• 2013

본 연구는 두개의 서로 다른 LJ 입자가 혼합된 계에 대하여 이들 사이의 LJ parameter 변화가 어떠한 영향을 미치는지 모의실험을 하였다. 조사 대상은 비활성 기체인 He과 Xe을 기준으로 하여 이들의 LJ parameter를 기준값으로부터 일정하게 변화시키며 열용량을 관찰하여 진행하였다. 분자간 상호작용만을 고려하여, 단원자 기체인 비활성 기체의 Lennard-Jones potential energy를 구하였다. Epsilon 값과 sigma 값을 바꿔 Lennard-Jones potential energy의 변화를 알아보고자 한다. 본 연구를 통해 sigma, epsilon 값이 클수록 Lennard-Jones potential energy가 커진다는 것을 알 수 있었다.

• 신재생에너지
• /
• 제20권1호
• /
• pp.88-94
• /
• 2024

This study explored the potential and implementation of renewable energy sources in Sri Lanka, focusing on the theoretical potential of solar and wind energy to develop self-reliant energy models. Using advanced climate data from the European Centre for Medium-Range Weather Forecasts and Global Solar/Wind Atlas provided by the World Bank, we assessed the renewable energy potential across Sri Lanka. This study proposes off-grid and minigrid systems as viable solutions for addressing energy poverty in rural regions. Rural villages were classified based on solar and wind resources, via which we proposed four distinct energy self-reliance models: Renewable-Dominant, Solar-Dominant, Wind-Dominant, and Diesel-Dominant. This study evaluates the economic viability of these models considering Sri Lanka's current energy market and technological environment. The outcomes highlight the necessity for employing diversified energy strategies to enhance the efficiency of the national power supply system and maximize the utilization of renewable resources, contributing to Sri Lanka's sustainable development and energy security.

• 환경영향평가
• /
• 제21권4호
• /
• pp.573-579
• /
• 2012

Many countries have recently been expanding efforts for low-carbon global economy to solve the problem of global warming. Development and research for various types of new reusable energy is on the rise throughout the world. The most promising source of energy is the solar photovoltaic energy and the government take an initiative to establish both short-term and long-term policies to develop the solar energy potential resource map. The solar energy and industrialize area researched by GIS methods for optimum site for solar power transfer system. This study attempts to address the hot issue of the development and suitability of the solar photovoltaic energy site using GIS spatial analysis. We need to analyze and describe the solar technology, green energy policies and the energy market trend of the field.