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폴리에스테르 모르타르용 충전재로서 금속광산 폐광미의 활용 연구
윤성진,최낙운,문경주,소양섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The purpose of this study is to examine the basic properties of polyester mortars using fine tailing(FT) as a filler. The FT is obtained by centrifugal separation of tailing(TA), and checked for basic properties of shape, particle size distribution, chemical composition, resin absorption. Polyester mortars with FT and ground calcium carbonate(GC) are tested for working life, flexural and compressive strengths. The test results showed that FT has much the same properties as GC in the shape, size and resin absorption. The working life of the polyester mortars is lengthen with an increase in the filter/binder ratio. The polyester mortars with a filter/binder ratio of 1.0 have the maximum flexural and compressive strengths.
송갑득,박영일,이상문,이윤수,최낙진,주병수,서무교,허증수,이덕동 한국센서학회 2002 센서학회지 Vol.11 No.6
센서의 안정도와 감도를 개선시킬 수 있는 단일전극을 가진 열선형 마이크로 가스센서를 제작하였다. 일반적으로, 금속산화물 반도체를 이용한 가스센서는 히터전극과 감지전극의 두 개의 전극을 가지고 있다. 제작된 센서는 히터전극위에 감지물질을 형성하여 단일 전극을 가지는 구조를 가지고 있다. 히터와 감지전극으로 사용되는 Pt는 glass 기판위에 스퍼터링법으로 형성하였으며, SnO_2 감지물질은 제작된 Pt 전극위에 열증착시켜 형성하였다. SnO_2막은 lift-off 공정을 이용해서 패턴을 형성하고 1시간 동안 산소분위기에서 열산화하였다. 제작된 소자의 크기는 1.92x.1 mm^2 이다. CO 가스에 대한 감지특성을 조사한 결과 1,000 ppm에 대해 100 mV의 출력변화를 나타내었으며, 넓은 농도범위(0 ~ 10,000 ppm에서 선형적인 전압출력을 나타내었다. 또한 가스 반응 전과 반응 후의 전압출력을 비교해 볼 때, 1 % 이내의 편차를 나타내는 우수한 회복성을 나타내었다. Micro gas sensor with single electrode was proposed for improving stability and sensitivity, Generally, metal oxide gas sensors have two electrodes for heating and sensing. This fabricated new type sensor have only a single electrode by forming a sensing material onto heating electrode. Pt as a heating and sensing electrode was sputtered on glass and a SnO_2 sensing material was thermally evaporated on Pt electrode. SnO_2 was patterned by lift-off process and then thermally oxidized in O_2 condition for 1 hr., 600 ℃. The size fabricated sensor was 1.9 x 2.1 mm^2. As a result of CO gas sensing characteristics, this sensor showed 100 mV change for 1,000 ppm and linearlity for wide range(0 ~ 10,000 ppm) of gas concentrations. And the sensor shows a good recovery characteristics of 1 % deviation compared to initial resistance.
Mun Haeng Lee,Myung Soo Park,Hae Keun Yun,Eui Il Hwang,Nak Beom Jeon 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Plant pathogens, Fusarium asiaticum, Trichothecium roseum and Penicillium oxalicum is causal agents causing severe fruit rot in melon plants. These pathogens were isolated from melon fruits in Buyeo, Chungnam province, 2019. They mainly occurred on fresh fruits until the fruits are harvest after fruit set. Spores of the three pathogens are germinated in 4hrs at 25°C. In this study, we investigated an antifungal activity against these pathogens using antagonistic bacteria, Paenibacillus polymyxa, Bacillus velesensis and B. amyloliquefaciens. The antifungal bacteria inhibited mycelial growth and spore germination of three pathogens. Antagonistic bacteria strains will be using as potential agents for biological control of melon fruit rot.
종합병원의 건축 프로그래밍을 위한 전문가 시스템 개발에 관한 연구
문윤기,이낙운 한국의료복지시설학회 1997 의료·복지 건축 Vol.3 No.5
The purpose of this thesis is to develop the new method of the expert system as a new approach of the architectural programming in general hospital. Theoretical and field investigations have been made for this study, and finally, the computer pro-gram for the architectural programming of general hospital was established. The architectural programming of general hospital is more complex than any other types of buildings and has been changed rapidly according to the social, cultural and environmental factors. Hence, a new approach method is necessary for corresponding to the complexity and these factors. Therefore, the computer should be used as a tool in order to operate more logical and systematic programming.
열압 성형법에 의한 폐목재-플라스틱 복합패널의 기초적 성질
최낙운(Nak-Woon Choi),문경주(Kyoung-Ju Mun),최산호(San-Ho Choi) 유기성자원학회 2004 유기물자원화 Vol.12 No.4
본 연구에서는 가연성 건설폐기물 재활용의 일환으로, 폐발포폴리스티렌의 스티렌 용액에 가교제 및 개시제를 첨가하여 제조한 결합재와, 폐목재 칩을 이용하여, 폐목재-플라스틱 복합패널을 제조하였다. 전열프레스를 이용하여 다양한 결합재량 및 충전재-결합재 비를 갖는 복합패널 공시체를 제조하였으며, 그 겉보기 밀도, 흡수율, 흡수에 의한 팽창률, 휨강도, 내수성 등에 관한 일련의 실험을 행하였다. 폐목재-플라스틱 복합패널의 겉보기밀도는 결합재량 및 충전재-결합재비의 증가에 따라 증대하며, 그 휨강도 및 습윤 휨강도는, 결합재량 35%, 충전재-결합재비 0.8에 있어서 최대치에 이른다. 흡수율 및 흡수에 의한 두께 팽창률은, 결합재량 및 충전재-결합재비의 증가에 따라 현저하게 감소한다. 결합재량 30%이상의 경우, 충전재 -결합재비에 관계없이, 복합패널의 24h 상온 수중(20℃) 침지 및 2h 끓는 물중(100℃)+1h상온 수중(20℃) 침지에 의한 휨강도의 감소는 거의 발생하지 않으며, 높은 내수성을 발현한다 A styrene solution of waste expanded polystyrene with a crosslinking agent and an initiator was used as a binder for waste wood-plastic composite panels. The waste wood-plastic composite panels are prepared with various binder contents and filler-binder ratios by using a hot press molding method. The apparent density of the composite panels is increased with increasing binder content and filler-binder ratio, while their water absorption and expansion in thickness are decreased with increasing binder content and filler-binder ratio. The maximum flexural strength and wet flexural strength of the composite panels are obtained at a binder content of 35% and a filler-binder ratio of 0.8. Decreases in the flexural strengths of the composite panels due to water immersion at 20 and 100℃ are hardly recognized at binder contents of 30% or more