• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.187-190
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• 2005

As the interest in environmental pollution increases acknowledging that interrelated energy and environment problem, the use of renewable energy is uprising. Among the renewable energy resource, Wind and Solar energy has no environmental impact and use unlimited resource. Solar power is not available during the night time, the wind power can be used as a natural supplement Data of irradiance and wind speed recorded in average day for years are used. These data are used to obtain the probability average power of wind and solar systems. In this paper, A technique that can lay the foundation fot building the wind and solar power systems of a southwest area in a optimal way.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.58-58
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• 2011

현 의류 섬유산업의 트렌드는 친환경, 무공해, 인체친화, 고감성, 고급스러움 등을 표현할 수 있는 제품으로의 전환이 이루어지고 있으며, 최근 부드럽고, 편안하고, 모던한 특징 및 내추럴한 느낌을 나타내는 천연섬유에 대한 요구가 더욱 늘어나고 있다. 양모 섬유는 천염섬유 중 많은 비중을 차지하고 있는 단백질 섬유로서, 이를 이용한 다양한 직물과 의류제품은 국내외적으로 유명 브랜드 바이어와 지속적으로 내수와 수출이 이루어지는 대표적 섬유이다. 그러나 양모 소재에 특유의 구조와 형태로 소재간 섬도차로 인해 고급섬유에의 복합시 물리적, 감성적 이질감으로 상품화가 제한되고 있으며, 소비자 및 바이어들은 기존 보다 더욱 부드러운 고급감의 양모소재를 선호하고 있다. 이에 천염섬유 중에서도 세섬도 생산의 한계가 있는 양모섬유에 대해 양모섬유의 끝단을 마이크로 분활화 및 세섬화를 가능하게 함으로서 새로운 고감성 및 고급감을 부여할 수 있을 것이며, 본 연구에서는 산 및 초음파 등의 물리화학적 분할 기술을 적용하여 부분적 피브릴화 세섬화된 양모소재에 대한 염가공 특성을 기존 양모소재와 비교 함으로서 개질 양모소재의 제품화 실용성 여부를 검토하였다.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.7
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• pp.57-62
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• 2014

This study presented the feasibility of a coolant heat-source heat pump system as an alternative heating system for electrically driven vehicles. Heat pumps are among the most environmentally friendly and efficient heating technologies in residential buildings. In various countries, electric mobiles devices such as EV, PHEV, and FCEV, have been mainly concerned with heat pumps for new mobile markets. The experiments herein were conducted for various ambient temperatures and coolant temperatures to reflect the winter season. The system, a coolant heat-source heat pump, consisted of an inside heat exchanger, an outside heat exchanger, a motor driven compressor, an electronic expansion valve, and plumbing parts. For the experimental results, the maximum heating capacity and air discharge temperature are up to 6.3 kW and $62^{\circ}C$ respectively at an ambient temperature of $10^{\circ}C$, and coolant at $10^{\circ}C$. However, at $-20^{\circ}C$ ambient temperature and $-10^{\circ}C$ coolant temperature, conditions were insufficient to warm the cabin as the air discharge temperature was $13^{\circ}C$.

• Journal of the Korean Institute of Gas
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• v.6 no.1 s.17
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• pp.32-37
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• 2002

Natural gas became one of the major sources of energy in Korea. As the consumption of natural gas increase, the more capacity of the LNG storage tanks Is required. Recently, Korea Gas Corp.(KOGAS) has developed the technology nt' designing the LNG storage tanks. In this study, some of the finite element analysis has been made for designing of the roof structure of LNG storage tanks. The load case and safety code used In this study were followed by BS7777.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1520-1521
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• 2007

고분자 전해질 연료전지(PEMFC, polymer electrolyte membrane fuel cell)는 수소이온특성을 갖는 고분자막을 전해질로 사용하는 연료전지로서 무공해 차량의 동력원, 가정용 발전, 우주선용 전원, 군사용 전원 등 매우 다양한 부분에서 사용되어질 것으로 사료된다. 하지만 현재 높은 가격과 짧은 수명 등의 문제로 상용화에 이르지 못하고 있다. 고분자전해질 연료전지의 스택 가격을 부품별로 조사하여 보면 분리판이 전체 스택가격의 60% 정도가 가장 높은 비중을 차지하며 기체 확산층으로 사용되는 탄소재료가 12%,전해질이 10%, 촉매가 8% 정도를 차지한다. 촉매 또한 저가의 비귀금속 촉매를 개발하거나 백금 촉매의 성능을 향상시켜 촉매 사용량을 낮춤으로써 가격을 낮추기 위한 연구가 진행되어지고 있으며 전해질로 사용하는 고분자막도 가격이 매우 높은 Nafion 대신 저가 고분자를 개발하거나, 또는 가능한 얇은 전해질을 사용하기 위한 노력이 이루어지고 있다. 하지만 아직까지는 뚜렷한 진척성과가 없는 것으로 알려져 있다. 그래서 본 연구에서는 고분자 전해질 연료전지의 고분자 Membrane의 특성을 향상시키고 또한 박막의 배양성과 특성에 대해서 고찰해 보고자한다.

• Journal of the Korean Wood Science and Technology
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• v.21 no.3
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• pp.67-73
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• 1993

This study was attempted to develop the Special Sheet Former for Hanji (Korean Traditional Paper), which could be easily used anyone who has no any special skill, and to evaluate its sheet forming characteristics. The sheet former for Hanji was designed, manufactured and tested its sheet forming features. This former was resulted in superior even basis weights and good formation of sheets without any special technological experiences, but poor consolidation according to the difficulty of web pressing during dewatering process. Sulfomethylated pulping resulted in the superior pulp with high yield and better quality compared to those of alkali and alkali-peroxide pulps. Since the pulp was so bright, there was almost no need additional bleaching.

• Journal of IKEEE
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• v.23 no.1
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• pp.334-337
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• 2019

In response to the increasing demand for energy, research and development of next-generation energy is actively carried out around the world to replace fossil fuels. Among them, the specific gravity of solar power generation systems using infinity and pollution-free solar energy is increasing. However, solar power generation is so different from solar energy that it is difficult to provide stable power and the power production itself depends on the solar energy by region. To solve these problems in this paper, we have collected meteorological data such as actual regional solar irradiance, precipitation, temperature and humidity, and proposed a solar power output prediction system using logic-based fuzzy Neural Network.

• Journal of the Society of Naval Architects of Korea
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• v.61 no.3
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• pp.185-199
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• 2024

Global warming impacts every corner of human life. Maritime transportation and shipbuilding industries are no exception. Recent counteraction in maritime industries is accelerating to meet the zero emission by 2050. Various alternative energy sources have been studied, and recent developments in Europe show that the windship, as a proven technology, can be an attractive candidate to solve the problem. In this paper, as the alternative transportation option, to infer the performances of modern windships, the non-dimensional ratios of past tall ships and windships are studied and reviewed. In addition, the ratios are compared to estimate the position of current and future windships under consideration. It is found that regarding the ratio distributions, the current windships being planned can be either wind-assisted propulsion ships or less fully functional windships than the past tall ships.

• Korean Journal of Agricultural Science
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• v.4 no.2
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• pp.317-343
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• 1977

This study was carried out to obtain the informations about evaporation from pot, soil temperature and soil atmosphere composition in pot, and the effect on the growth of nine ornamental species using seven different containers. The investigated containers were clay pot(CP), clay pot painted in green(CP-P), varnished clay pot(CP-V), polyethylene film inserting in clay pot(CP-PI), clay pot mulched with black polyethylene film(CP-PM), porcelain pot(POP), and plastic pot(PLP). Nine ornamental species were balsam(Impatiens balsamina), chrysanthemum(Chrysanthemum morifolium), cosmos(Cosmos bipinatus), English ivy(Hedera helix), geranium(Pelargonium zonale), kochia(Kochia scoparia var. trichophila), marigold(Tagetes patula), ornamental kale(Brassica oleraceae var. acephala), and salvia (Salvia splendens). The results obtained are summarized as follows: 1. Dry weight of all tested species grown in PLP, POP, CP-P, CP-V and CP-PI was heavier than that of CP. 2. Plant height in nine tested species grown in PLP, POP, CP-P, CP-V, and CP-PI was taller than that of CP. 3. Geranium grown in PLP, POP, CP-P, and CP-V gave more number of leaf than that of CP. 4. The number of flower in balsam grown in PLP, POP, CP-P, CP-V and CP-PI was more than that of CP. The result from marigold was very similar to this tendency. Spike length and floret number in salvia gave the same tendency, but its spike number was not different among containers used. 5. The average diurnal evaporation from PLP and POP was about 43% of that of CP. About two third of total evaporation from CP was through pot wall. 6. The evaporation rate from the slowest to the highest was PLP, POP, CP-P, CP-V, CP-PI, CP-PM and CP. Containers inhibiting evaporation through pot wall hold more soil moisture than CP from one day after water supply. 7. The more evaporative water-loss from containers gave the lower soil temperature. The variation of soil temperature among containers was higher during the day than the night. 8. The $O_2$ concentration of soil atmosphere in CP was higher than that of nonporous containers, and the difference between them was 0.40-1.12%. The range of the $O_2$ concentration 17.95~19.62%. The $CO_2$ concentration of soil atmosphere in CP was lower than that of nonporous containers, and its range was 0.59-1.76%. This deviation in soil atmosphere composition did not influenced on the growth of plants. 9. There was a possitive correlation between the amount of soil water and the plant growth. 10. Plant grown on CP gave more total nitrogen content in top growth than that on PLP. C/N ratio was somewhat low in plant on CP. From the above results, $O_2$ and $CO_2$ concentration in soil atmosphere did not gave enough deviation to the extent which affect the plant growth. The effect of soil moisture on the plant growth using different containers was the far-most significant factor from this investigation. Therefore, it was obious that the utilization of the nonporous container might save the cost for water supply and reduce the production cost of the pot-grown ornamental plant in Korea eventually.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.5
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• pp.335-341
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• 2014

Physical experiments were carried out to measure the wave force on the vertical walls of perforated breakwater considering several phases of a wave acting on the breakwater. The maximum horizontal wave force acting on each vertical wall was compared between single and double chamber caisson breakwater. The experimental data in this study showed that the total horizontal wave force for double chamber caisson was 9.6% smaller on average than that for single chamber caisson when the total chamber width was the same for both caissons. Such reduction of the wave force is due to the dissipation of wave energy at the porous middle wall, which is located between the porous front wall and non-porous rear wall.