• 한국태양에너지학회:학술대회논문집
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• 2008.11a
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• pp.141-146
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• 2008

For the efficient use of thermal energy and its related equipments, optimal energy in view of quality and quantity should be timely provided. The core of thermal energy storage technology deals with an energy efficiency for effective energy storage and supply. The relative importance of thermal energy storage technology has been underestimated so far, and the specific projects on this filed have been performed intermittently. For the efficient and systematic approach of the energy supply system projects on thermal energy storage technology, we conduct the survey on the current status of this field. Firstly, classify into the thermal energy storage and describing the recent research for each system. The necessity and importance of thermal energy storage technology is identified through this study. It reveals that the thermal energy storage is the mandatory technology to solve the difference of supply and demand in thermal loads. It would greatly contribute to the combined heat and power(CHP) system. The urgent technologies for the commercial value and the core technologies for the CHP system are classified with this study.

• Journal of Radiation Industry
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• v.5 no.3
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• pp.237-242
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• 2011

In this research, the radiation resistance of ethylene propylene rubber (EPR) and chlorosulfonated polyethylene (CSPE) which can be used as a insulating materials of for electrical cable in the nuclear power plant were investigated. EPR and CSPE were irradiated by ${\gamma}$-ray at various doses ranging from 50 to 500 kGy at room temperature in air. The irradiated EPR and CSPE was investigated in terms of activation energy, mechanical properties, and oxidation stability. The experimental results revealed that CSPE exhibited the higher radiation resistance in comparison to that of EPR.

• International Journal of High-Rise Buildings
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• v.10 no.2
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• pp.137-147
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• 2021

The principle of energy dissipation technology is to dissipate or absorb the seismic energy input through the deformation or velocity change of dampers installed in the main structure of high-rise buildings, so as to reduce the seismic response of the buildings. With the development of energy dissipation technology, recognized as an effective and new measurement for reducing seismic effects, its application in high-rise buildings has become more and more popular. The appropriate energy dissipation devices suitable for high-rise buildings are introduced in this paper. The effectiveness of energy-dissipation technology for reducing the seismic response of high-rise buildings with various structural forms is demonstrated with a number of actual examples of high-rise buildings equipped with various energy dissipation devices.

• Proceedings of the Korean Nuclear Society Conference
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• 2005.05a
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• pp.249-250
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• 2005

• International conference on construction engineering and project management
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• 2024.07a
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• pp.1314-1314
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• 2024

Since 2017, South Korea has been the first country in the world to implement a national certification system for Zero Energy Buildings (ZEB). This system aims to maximize the energy efficiency of buildings to reduce greenhouse gas emissions and reduce energy consumption in the building sector using renewable energy. To achieve this goal, the ZEB certification system classifies green buildings into five grades based on the energy independence rate. However, the current ZEB certification system based on the energy independence rate is only considered a requirement for building completion, losing its original intent. This study aims to highlight the problems and limitations of the ZEB certification system based on the energy independence rate and to propose an operational plan for the system that can genuinely reduce energy consumption in the building sector. For this, the actual energy consumption and the renewable energy production referenced during the certification of 10 ZEB-certified buildings were quantified and compared with the energy independence rate. The total energy consumption, energy production, life cycle cost, performance coefficient of equipment, and other key indicators were analyzed to evaluate the actual effects of ZEB certification on energy savings. As a result, the simple energy independence rate-based ZEB certification was judged to be inconsistent with the original intent of the system. The ZEB certification system needs to be re-established to reflect the design of systems that can activate and utilize energy savings and renewable energy usage in buildings. Additionally, improvements in the management and inspection systems are necessary to determine how much they contribute to actual reductions in greenhouse gas emissions and energy consumption post-certification.

• Journal of Energy Engineering
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• v.17 no.3
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• pp.125-138
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• 2008

In order to diversify energy source and to utilize it effectively, it requires to construct an integrated energy management system in a wide area. This research paper explores the core technology of network construction using wide area energy and applies the technology to the field. In specific, it examines the business model by developing l) construction technology of optimum integrated system for thermal supply on wide area network related IT technology, 2) technology of unutilized energy as heat pump using exhaust gas latent heat, and 3) thermal transportation and storage technology using various sources, and by evaluating the applicability and marketability of the model in the field.

• International Commerce and Information Review
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• v.16 no.4
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• pp.363-384
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• 2014

The adequate measurement of government expenditure efficiency for Energy Technology Development is a difficult empirical issue and the literature on it, particularly when it comes to aggregate and international data. Contribution in this study is threefold: first this study analyze the adequate measurement of government expenditure efficiency on Energy Technology sector of 24 OECD countries and korea. Second this study reconstruct efficiency composite indicators, named "Energy Technology Development Interest level indicator". Third this study assesses the efficiency of government expenditure for Energy Technology Development. The results can be summarized as follow: Korea's government expenditure efficiency for Energy Technology Development is highly ranked among 25 OECD countries based on Energy Technology Development R&D Budgets and Energy Technology Development R&D Budgets per thousand units of GDP indicators. However, Korea's ranking has fallen to 20th. The assessment suggests that government will be have to provide more government expenditure to enhance the efficiency on Energy.

• Nuclear Engineering and Technology
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• v.49 no.1
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• pp.172-177
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• 2017

A novel biosorbent, immobilized Saccharomyces cerevisiae in magnetic chitosan microspheres was prepared, characterized, and used for the removal of $Sr^{2+}$ from aqueous solution. The structure and morphology of immobilized S. cerevisiae before and after $Sr^{2+}$adsorption were observed using scanning electron microscopy with energy dispersive X-ray spectroscopy. The experimental results showed that the Langmuir and Freundlich isotherm models could be used to describe the $Sr^{2+}$ adsorption onto immobilized S. cerevisiae microspheres. The maximal adsorption capacity ($q_m$) was calculated to be 81.96 mg/g by the Langmuir model. Immobilized S. cerevisiae was an effective adsorbent for the $Sr^{2+}$ removal from aqueous solution.

• Proceedings of the Korean Nuclear Society Conference
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• 2003.05a
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• pp.427-427
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• 2003

• Journal of Hydrogen and New Energy
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• v.34 no.6
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• pp.641-649
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• 2023

This study analyzes the cool-down process of liquid hydrogen storage tanks, which have advantages in terms of large-capacity transfer, storage, and utilization as hydrogen demand increases. A hydrogen liquefaction plant is selected for analysis and an efficient tank cooling method is sought by comparing the time required for the cool-down process with the gas consumption in connection with the gassing-up process required for the operation of the liquid hydrogen storage tank. The results of this study can be referred to in the operation process after the initial start-up and maintenance of the hydrogen liquefaction plant.