• Journal of Advanced Marine Engineering and Technology
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• v.36 no.8
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• pp.1097-1103
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• 2012

There are many fish farms being cultivated in the southwestern cost of South Korea. Because the farms cultivating use the basic method that inflow and circulate sea-water, slight negligence and bad design cause major negative impact on fish deaths. Also, the optimal temperature for each specie of fishes has already been proven to differ on each specie. Maintaining this environment, regardless of seasons, is very difficult and that requires research to develop. In this paper, basic characteristics of heat and mechanism of heat transfer are studied. Based on this, Open-end water vessel is designed and constructed using sandwich-insulation panels and simulated to store the heat in certain isolated space. This study confirmed that it is possible to keep constant temperature by this method, in large areas of water where it is insulated by heat insulator. and equipped with heater in Open-end water vessel where the other part is heated. The AC power controller maintains the constant temperature required and the temperature controller detects and displays the temperature by using the micro-processor.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.11
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• pp.908-914
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• 2013

This study has developed a small solar powered UAV and performed its flight tests. In daylight, a solar powered UAV flies by using some of electricity generated from solar cells, and stores the remainder into battery. At night it flies by using electricity from battery. A solar powered UAV should have aerodynamically efficient configurations, light-weight, strong wing and fuselage. Its electric propulsion system and solar power system should also be very efficient. In the present study the solar powered UAV and its solar power system are developed for 12 hour continuous flight and the flight tests are performed to verify its performance. The flight tests performed in fall and winter to prove the present solar powered UAV is successful in four-season 12 hour flight.

• Journal of Energy Engineering
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• v.22 no.2
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• pp.83-89
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• 2013

Energy consumption is closely related to our lives. As Korea has four seasons, heating and cooling system is considered as essential facilities for the residential buildings. Accordingly, the government has continuously strengthened the design criteria to improve energy for new and existing building to save energy. The most important factor in the energy efficiency analysis for apartment is the heat transmission coefficient, and the value is significantly different as the heating energy amount is greatly different according to the window area ratio versus facade area ratio. Therefore, it is time to conduct continuous set-up for goal to enhance efficiency and restriction on window area ratio versus facade area ratio.

• Magazine of the Korean Society of Agricultural Engineers
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• v.40 no.2
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• pp.18-28
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• 1998

현재의 가축분뇨처리 형태와 축종별 적용대상은 표 3과 같이 분류되며, 축분 퇴비화 뇨오수 정화방식의 고액분리 형태에서 분뇨혼합물의 동시처리 즉, 깔감축사(소, 돼지), 슬러리 발효 퇴비화를 통한 무방류 시스템으로 변화되는 추세이다. 이러한 현상은 최근의 방류수질 규제강화에 따른 무방류화 저비용 단순화를 지향하고 있으며, 무방류화의 가장 큰 걸림돌은 톱밥과 같은 수분조절재 부족이라 할 수 있다. 현재 이용되고 있는 주요 시스템별 개선안은 다음과 같다. $\square$ 주요 처리 시스템 적용의 문제제기 $\circ$ 축분발효시설 - 톱밥 등 부자재 무이용을 위한 축분의 예비 건조시설 이용 - 교반식 발효기의 악취확산방지를 위하여 밀폐형 하우스 및 강제환기 장치 설치에 의한 악취 포집 및 탈취 - 중소규모 발효시설 개발 $\circ$ 화력건조 - 예비건조를 통한 톱밥, 연료비용 절감 - 악취방치 장치부착 의무화 $\circ$ 활성오니 정화시설 - 시설 운전관리 단순화 - 1차 고액분리를 통한 유입수 오염부하량 감소 및 균일화 $\circ$ 깔감축사 - 경제적으로 흡수를 극대화할 수 있는 수분조절재의 조합비 결정 및 혼합물을 깔감으로 재이용 기술개발 $\circ$ 슬러리 발효퇴비화 시설 - 톱밥 등 수분조절재 사용량 절감기술 - 증발량 극대화 기술개발 및 소요에너지 최소화기술개발 우리나라는 사계절이 뚜렷하여 외기상에 따라 편차가 심하며, 고밀도 사육 및 지역적 편중성, 경지면적 협소, 고비용 시장구조 등의 축산환경을 고려한다면 근원적으로 가축분뇨문제 해결한다는 것은 결코 쉬운 일이 아니다. 이는 저공해 사료개발에서부터 분뇨가 발생단계에서 분리, 수거할 수 있는 수거시설, 고효율 분뇨처리시스템의 정립, 액비 및 퇴비의 가공, 토양환원되었을 때 작물생장장애, 액비, 퇴비의 유통, 가축분뇨처리 정책 및 규제법 등의 각 분야에서 복합적 노력이 필요하다.

• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.157-164
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• 2007

Human made a vessel which was made naturally to store something being hunted and picked, which was a great invention.(n modern times, society changed and development of science gave us convenience in making a vessel and various kinds of store instruments which was made of pure natural material), They have built the house which became to be a part of nature, and studied a method of storing food to eat for four seasons, then displayed a storage house and storage containers everywhere of the house. Now Korean has the custody of kimchi in refrigerator at every house. With hot wind of well-being, Korean food is becoming to be globalized, according to this the world shows concern seriously about the pottery This study have three purposes, the first. checking documents about the development history of pottery which is a kind of ceramic, and then the second, through an scientific experiment, with studying characteristic of pottery being built by the wisdom of ancestors, informing the merit of pottery and necessity to the world, and futhermore, the third, working up the development of close environmental vessels putting to use the characteristic of pottery.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.965-968
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• 2008

The KS F 2403 method used on domestic sites for checking the compressive strength of a structure, sets the compressive strength of the concrete used in structural specimens as the compressive strength of testing specimens. Under this regulation, the curing method used for testing the specimens must be the standard ponding curing method (20$\pm$2$^{\circ}$C). However, because in-placed concrete is exposed to open air and cured under the seasonal temperature changes, the compressive strength of a real structure is different from the tested compressive strength. (Therefore,) This thesis first identifies the distinct characteristics of the strength development by applying the curing method listed under the KS and used for testing specimens on compressive strength tests; the atmospheric curing method, the sealed curing method, and the structural specimen core strength testing methods used for the in-sites quality checks including reckoning of the compressive strength of the structural specimens and form-demolding period; and the curing method suggested in this research, which sets the internal conditions of the structural specimens as the conditions of the applied curing method. Then, the thesis suggests the specimen curing method that most closely reenacts the compressive strength of the concrete used on the structural specimens

• Atmosphere
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• v.22 no.2
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• pp.245-257
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• 2012

The Asian dust (Hwangsa) forecasting model, Asian Dust Aerosol Model (ADAM) has been modified by using satelliate monitoring of surface vegetation, which enables to simulate dusts occuring not only in springtime but also for all-year-round period. Coupled with the Unified Model (UM), the operational weather forecasting model at KMA, UM-ADAM2 was implemented for operational dust forecasting since 2010, with an aid of development of Meteorology-Chemistry Interface Processor (MCIP) for usage UM. The performance analysis of the ADAM2 forecast was conducted with $PM_{10}$ concentrations observed at monitoring sites in the source regions in China and the downstream regions of Korea from March to December in 2010. It was found that the UM-ADAM2 model was able to simulate quite well Hwangsa events observed in spring and wintertime over Korea. In the downstream region of Korea, the starting and ending times of dust events were well-simulated, although the surface $PM_{10}$ concentration was slightly underestimated for some dust events. The general negative bias less than $35{\mu}g\;m^{3}$ in $PM_{10}$ is found and it is likely to be due to other fine aerosol species which is not considered in ADAM2. It is found that the correlation between observed and forecasted $PM_{10}$ concentration increases as forecasting time approaches, showing stably high correlation about 0.7 within 36 hr in forecasting time. This suggests the possibility that there is potential for the UM-ADAM2 model to be used as an operational Asian dust forecast model.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.733-738
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• 2017

In this study, we selected chlorine, a typical toxic material used in many workplaces, as the leakage material, and through the analysis of alternative scenarios based on the meteorological conditions in the summer frequently encountered in accidents, we suggest ways to improve the (method of analysis/accident scenario modeling). The analysis of 296 chemical accidents from January 2014 to December 2016 found that the highest rate of occurrence was in summer, accounting for 35.81% of the total. According to the risk assessment, the influence range and number of inhabitants in the influence area were 712.4 m and 20,090 under the annual mean weather conditions and 796.2 m and 27,143 people under the summer mean weather conditions, respectively. This result implies that, under certain conditions, the range of impacts in the current alternative scenario is incomplete. Therefore, risk assessment systems need to be improved in order to take into consideration the characteristics of each chemical substance.

• Journal of the Korea Organic Resources Recycling Association
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• v.18 no.4
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• pp.54-63
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• 2010

When MBT(Mechanical Biological Treatment) facility is designed, the management system adequate for domestic circumstance in Korea has been insufficient and power plant's load on seasonal variation has not been resolved yet. Thus, this study introduced MBT facility and MSW(Municipal Solid Waste)'s seasonal emission characteristics were investigated in order to establish new MBT management system. and additional thermal buffer-materials's calorific values were also considered to reduce the power plant's load. The results showed that the screening efficiency of MBT facility and the physical characteristics of each waste can be identified, and the calorific value by seasonal variation for MBT facility can be kept constant all the year round by using an additional thermal buffer-materials.

• Journal of the Korean Society of Food Culture
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• v.4 no.3
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• pp.293-300
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• 1989

오늘날의 청주(淸酒)는 SAKE라는 이름으로 일본(日本)을 대표(代表)하는 술로 여겨지고 있으나 사실 일본식(日本式) 청주(淸酒)의 제법(製法)도 결국(結局)은 우리나라에 그 근원을 두고 있다. 오늘날의 청주(淸酒)는 우리의 술 빚는 법이 일본(日本)으로 전래된 후, 일본(日本)에서 잘 다듬어져 다시 우리나라에 상륙(上陸)한 것으로 現在의 청주(淸酒)의 근본도 그 뿌리는 백제를 비롯한 우리나라에 있음은 주지할 만한 사실이다. 그러나 우리 고유의 술빚는 법이 체계적으로 정리되지 못하고 사라져 버린데에는 우리의 전통사상의 일부인 과학, 기술 노동을 천시하는 풍조와 술빚는 일을 특히 여성의 전유물로 여겨 양조법의 정립이 이루어지지 못한 것도 큰 이유라 하겠다. 자가용(自家用)으로만 사용되던 주조(酒造)에서 탈피하여 공업적(工業的)인 규모의 청주생산은 1883년 1월 후꾸다라는 일본인이 부산에 세운 공장을 시초로, 1917년 현 백화양조의 전신이라 할 수 있는 조선주조주식회사 설립으로 본격화되었다. 우리의 전통청주(약주)는 곡류와 누룩을 이용하여 빚는데, 누룩은 밀기울을 잘 다져서 장기간에 걸쳐 제조하며, 누룩에는 당화효소를 분비하는 곰팡이류와 알콜발효를 할 수 있는 효모류가 함께 부착되어 있다. 따라서 호화시킨 곡류와 누룩을 함께 넣어서 술을 빚게되면 당화와 발효가 동시에 일어나게 된다. 일본식 청주도 Koji라 불리는 국(麴)을 제조하는 것을 달리할 뿐 우리 전통청주와 제법의 맥락은 같다. Koji는 찐쌀에 곰팡이류를 인위적으로 접종하여 배양한 것으로, 결국 당과용 효소를 얻는다는 것은 누룩과 같은 원리이나 곰팡이균을 분리하여 접종하는 것이 다르다. 한국의 청주판매 현황을 보면 80년대 초반 급격한 감소추세를 보였으나, 업계가 적극적인 판촉활동을 벌임과 동시에 새로운 TYPE의 냉청주(冷淸酒)를 개발하여 여름철이 비수기였던 시장 상황을 완전히 깨뜨려 사계절의 주류로 만드므로서 뚜렷한 회복, 증가추세로 바꾸었다. 앞으로 좀더 잘 다듬어지고 현대 이미지에 맞는 청주가 지속적으로 등장하여야 하며, 결국 이러한 민족고유의 맛이 가미된 청주 TYPE의 주류가 우리나라를 대표하는 국주로까지 발전할 수 있으리라 확신한다.