• The Journal of Sustainable Design and Educational Environment Research
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• v.21 no.2
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• pp.25-35
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• 2022

With the enactment of the "Framework Act on Carbon Neutrality and Green Growth to Cope with Climate Crisis," various sector-specific plans are being implemented to achieve carbon neutrality. School facilities are mandatory buildings for the "Zero Energy Building Certification" and are the buildings that account for the highest proportion among public institution buildings. Therefore, they play a major role in achieving carbon neutrality in the construction sector. This study analyzed the recent energy use trends and zero energy levels in varied ways to promote the spread of building energy management systems and to provide basic data for efficient operation management and investigated the effectiveness and user opinions of the Building Energy Management System (BEMS) applied to school facilities.

• Journal of Environmental Science International
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• v.30 no.6
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• pp.455-463
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• 2021

This study investigated the biomass content of fluff type SRF(Solid refuse fuel) operated in B city according to the physical composition. As a result of analyzing the physical composition of SRF, it was investigated that papers 25.2%, fiber 15.1%, vinyl·plastics 42.6%, woods 9.4%, rubbers 1.5%, diapers 3.2% and incombustibles 3.0%. The average of ash and combustible content of SRF was 10.5% and 89.5%, and the higher the proportion of paper and wood, the lower proportion of ash. In addition, the biomass of SRF is 24.9%~58.0%, with an average of 42.6%.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.10a
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• pp.87-88
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• 2016

In the current construction market usage cement and aggregate is increasing continuously. This is progressing serious environmental pollution due to the carbon dioxide generated during cement production. Further, by using a large amount of aggregate, they tend to have even reduced natural resources. As a result, the reduction of carbon dioxide through the United Nations Framework Convention on Climate Change, the energy saving has been positioned as a global trend. Therefore, in this study, instead of fine aggregate fix the cement, by the use to increase the proportion of the tidal flats, to try to reduce the amount of cement and fine aggregate. Accordingly, according to increasing the proportion of the mud flat be analyzed for properties the compressive strength, tensile strength, flow, chloride test, workability of the mortar.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.111-112
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• 2016

Waterproofing methods for applying to roof-top in the building are various, but it is not enough to development, which are simplified and low-cost method for old building. Especially, these buildings have not only a low insulation, but a disadvantage for energy. A floating floor method is necessary for this. This study performs an experimentt about bonding capacity of complex panel for waterproofing and heat insulation. The bond strength experiment is based on KS F 4716, and it is considered by bond mix proportion about panel and slab.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.111-112
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• 2007

This paper presents the capacity payment in electricity power markets. The capacity payment (CP) needs to recover fixed costs. But most CP is allocated by energy policy. So, this paper analysis CP using capacity proportion and Reliability Pricing Model (RPM). The capacity proportion method uses base capacity price and supply available capacity. The RPM method uses value of each region and operation attribute of each generator.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.272-272
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• 2013

The attractive features of photosynthetic reaction center proteins for energy application make them useful in solar energy conversion to hydrogen fuel or electrical energy. Almost unity charge separation quantum yield and its rapid speed of ~1ns, absorbance region in visible light (480~740 nm) and high proportion of photosynthetically active solar energy of 48.5% allowed photosystem1 to exploited as a bio-material for photo-energy devices. Directionality of photosystem1 in electron transfer can solve main problem in two-step water splitting process where back reaction deteriorates the overall efficiency. In the study, photosystem1 was extracted from spinach and the photo-induced excited electron in the reaction center was utilized in various field of light energy application. First, hydrogen evolving system realized by photodeposition of platinum at the end of the electron transfer chain, with combining specific semiconductor to oxidize water in the first step of Z-scheme. The evaluation by gas-chromatography demonstrated hydrogen evolution through the system. For the further application of photoelectrical material on electrode, photosystem1 have been controlled by copper ion, which is expected to assemble photosystem in specific orientation followed by maximized photoelectrical ability of film. The research proposed concrete methods for combining natural protein and artificial materials in one system and suggested possibility of designing interface between biological and inorganic materials.

• Nuclear Engineering and Technology
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• v.51 no.1
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• pp.214-220
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• 2019

Thermochemical cycles have been predominantly used for energy transformation from heat to stored chemical free energy in the form of hydrogen. The thermochemical cycle based on uranium (UTC), proposed by Oak Ridge National Laboratory, has been considered as a better alternative compared to other thermochemical cycles mainly due to its safety and high efficiency. UTC process includes three steps, in which only the first step is unique. Hydrogen production apparatus with hectogram reactants was designed in this study. The results showed that high yield hydrogen was obtained, which was determined by drainage method. The results also indicated that the chemical conversion rate of hydrogen production was in direct proportion to the mass of $Na_2CO_3$, while the solid product was $Na_2UO_4$, instead of $Na_2U_2O_7$. Nevertheless the thermochemical cycle used for hydrogen generation can be closed, and chemical compounds used in these processes can also be recycled. So the cycle with $Na_2UO_4$ as its first reaction product has an advantage over the proposed UTC process, attributed to the fast reaction rate and high hydrogen yield in the first reaction step.

• New & Renewable Energy
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• v.17 no.3
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• pp.24-31
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• 2021

Through 'The Renewable Energy 3020 Implementation Plan' for carbon neutrality, the government promised to raise the proportion of renewable energy generation to 20% and renewable energy installation capacity to 63.8% by 2030. Therefore, we plan to test a 5.5 MW offshore wind turbine near Maldo, Gunsan. In this project, we measure the level of public acceptance and perform ordinary least squares (OLS) regression analysis to show the determinants of public acceptance. The regression results are as followed. First, it is judged that the closer the distance to the offshore wind turbine, the more the economic effects considered by residents. Second, especially in Maldo, the experience of being discriminated from the Saemangeum project, is understood to have caused distrust in the surrounding fishing villages chief/Fisheries Cooperatives, converted into a local community effect. Finally, the policy implications are as follows. First, a bottom-up problem-solving method is required to improve public acceptance, based on the Living Lab. Second, the island community may be indifferent to the briefings or forums of outsiders. Therefore, a gradual approach is required through (in)formal channels based on reliability from a long-term perspective with nearby universities and research institutes using SamsØ Energy Academy.

• Journal of Biosystems Engineering
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• v.20 no.4
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• pp.351-359
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• 1995

In pressure cooling system, produce were packed in vented box and cooled rapidly by producing a difference in air pressure on opposite faces of stacks of vented box. So, energy requirements and performance of pressure cooling system depended upon the air flow rate and the static pressure drop through packed produce in vented box. The static pressure drop across packed produce in vented box normally depended upon air flow rate, vent area of box and conditions of produce bed (depth, porosity, stacking patterns, size and shape of products) in box. The objectives of this study were to investigate the effect of vent area and air flow rate on airflow resistance of empty box and packed produce in vented box, and to investigate the relationship between the air flow resistance of packed products in vented box and sum of air flow resistance of empty box only and products in bulk only. Mandarins and tomatoes were used in the experiment. The airflow rate were in the range of 0.02~1.0$m^3$/s.$m^2$, the opening ratio of vent hole were in the range of 2.5~20% of the side area. The results were summerized as follows. 1. The pressure drops across vented box increased in proportion to superficial air velocity and decreased in proportion to opening ratio of vent hole. A regression equation to calculate airflow resistance of vented box was derived as a function of superficial air velocity and opening ratio of vent hole. 2. The pressure drops across packed produce in vented box increased in proportion to superficial air velocity and decreased in proportion to opening ratio of vent hole. 3. Because of the air velocity increase in the vicinity of vent hole in box, the airflow resistances of packed products in vented box were always higher than sum of air flow resistance of empty box only and products in bulk only. 4. Based on the airflow resistance of empty box and products in bulk, a regression equation to calculate airflow resistance of packed products in vented box was derived.

• Korean Journal of Community Nutrition
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• v.4 no.4
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• pp.529-538
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• 1999

It is very important to collect information on the nutritional status of the Korean population for the development of health promotion programs including nutrition. The purpose of this study was to assess the nutritional status of various population living in selected areas for model nutritional work. Seven hundred eighty households(30 households per each area)from 26 areas participated in this study from November 1 to November 20, 1996. Dietary intake data for two consecutive days were collected at household level by a weighting method. The mean energy intake of the subjects(1,934kcal) was higher than that resulted from the ‘95 Korean National Nutrition Survey(1,839kcal). The proportion of energy derived from cereals was 60.1%. The proportion of total protein intake from animal sources was 49.4%. These results were similar to those found in the ‘95 Korean National Nutrition Survey. Most nutrients(except iron, thiamin, riboflavin, vitamin C, and crude fiber) were higher than the result of the ‘95 Korean National Nutrition Survey. However, the average iron intake was about 68% of the result of ‘95 Korean National Nutrition Survey. This may be due to the adjustment of iron content in rice(3.7mg/100glongrightarrow0.5mg/100g) included in nutrient database for calculating nutrient intakes. The mean energy contribution from carbohydrate, protein, and fat were 64.2%, 16.4% and 19.4%, respectively. Significant differences of nutrient intakes were noted among some areas, which may be due to different food intake patterns according to the needs of the particular area. Therefore, the result of this study indicates that there are significant differences in food and nutrient intakes among the areas, suggesting that nutritional improvement programs may need to be developed differently by areas.