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열처리와 반복코팅이 자기조립을 통해 형성된 SiO₂ 광자결정의 광특성에 미치는 영향
오용택,신동찬 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.2
This study examined the effect of heat treatment and multi-coating on the microstructure and optical properties of photonic crystals that had been self assembled using monodispersed spherical SiO₂ nanoparticles. When the heat treatment temperature was increased, the reflectance peak due to the photonic band gap moved to a shorter wavelength direction, and the peak intensity of the Fabry Perot fringes increased. The highest reflectance peak intensity was obtained in the sample heat treated at 250~300℃. Heat treatment reduced the average particle size and number of defects, and increased the packing density of the photonic crystal. When the heat treatment temperatures were increased to 900℃, a large crack, whose average size is approximately 1.3 ㎛, formed through the self assembled layer. In addition, a multi-coating could effectively fill the open space of this crack and reduce the total number of defects dramatically.
자기조립을 통해 형성된 실리카 광자결정의 광특성에 미치는 기판의 영향
오용택,신동찬 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.spec
We investigated the effect of substrate on the fabrication of SiO_(2) photonic crystal by evaporation method. Monodispersed SiO_(2) nanopaticles were fabricated through the Stober process. The nanoparticles were self-assembled on quartz, corning 1737 glass, slide glass, ITO glass at vacuum oven by evaporation method. When the wetting angle increased the thickness of photonic crystal decreased. The peak intensity of reflectance had maximum value on the ITO glass (61%), which had highest wetting angle. We could obtain best optical properties through the control of wetting angle and particle contents.
14.6 A GeV ^28Si 중이온이 원자핵건판내에서 발생시킨 핵반응에서 생성된 2차입자의 발생각 분포
김종오,김태연,남신우,신택수,우종관,이세병,임계엽,장세덕,조재희,천병구,임인택,김기영 慶尙大學校 기초과학연구소 1990 基礎科學硏究所報 Vol.6 No.-
14.6A GeV^28Si 중이온이 원자핵 건판내에서 발생시킨 N_h=1인 핵반응에서 생성된 47개의 파쇄 α 입자와 537개의 단일하전 2차입자의 발생각들을 측정하여 변수 exp(γ-η_b)의 포괄적 분포를 회귀함수 dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}로 적합시켰다. 여기서 의사신속도 γ=arctanh(cosθ)=-ln tan(θ/2)이고, 입사 중이온의 신속도 η_b=3.445이다. 그 적합결과 파쇄 α입자의 경우 χ=-0.052±0.011이고, 파쇄 p입자의 경우 χ=-0.141±0.015이었다. For LS emission angles of 47 α fragments and 537 single-charged shower particles, produced by the N_h (the number of heavyprongs)=1 interactions of 14.6 A GeV^28Si nuclei in the nuclear emulsion, the distribution of the parameter exp(γ-η_b) is well expressed by dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}with χ=-0.052±0.011 for αfragments and χ=-0.141±0.015 for p 'fragments', where the pseudorapidity of secondaries γ=arctanh(cosθ)=-ln tan(θ/2) and the rapidity of incident heavy ions, η_b=3.445.
생석회를 이용한 하수슬러지와 음식물쓰레기의 자원화 및 경제성 평가
김대용,신현옥,노기 현,홍승목,성낙창 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1
This study was conducted to investigate use possibility of final by-products by lime stabilization process and these organic wastes as raw materials of organic compost at Fertilizer Official Regulation of Fertilizer Management Law in 2002. The sewage sludge and food wastes obtained from the S sewage treatment work in B city. All final byproducts were satisfied the standard levels of raw materials regulated in organic compost, but organic matter content of final byproducts were deficient in the level. The pH value of sewage sludge were almost neutral and the food wastes pH value ranged from 4.5 ~4.9. On the other hand, when lime was added, all the mixes became highly alkaline, showing pH values of > 12 for a long period of time after mixing. Therefore, this study unfolded the fertilizer from disposed lime is able to be used for agriculture, forestry and garden. 본 연구에서는 하수슬러지와 음식물쓰레기 를 생석회를 이 용하여 석회 안정화 반응 후 생성된 최종생성물의 유기물함량, 함수 율,중금속 등의 인자를 비료 공정 규격 중 기타 비료 의 석회처리 비료 허용기준과 비교하여 자원화 가능성 및 경제성을 평가한 결과 다음과 같은 결론을 얻을 수 있었다. 1) 석회안정화반응 후 생성된 최종생성물의 분석결과 전 항목에서 농촌진흥청고시 비료공정규격 중 기타비료의 석회처리비료기준 에 적합한 것으로 나타났으나,최종생성물을 다량 또는 장기 사용하는 경우 토양 및 작물에 대한 지속적인 안정성 연구조사가 필요할 것으로 판단된다. 2) 분쇄된 음식물쓰레기에 생석회를 투입한 후 얻은 최종생성물의 유기물함량 결과는 분쇄전의 결과치에 비하여 3-6배 이상이나 높아졌으며,유기물대 질소비가 80-90정도로 높은 결과를 얻을 수 있었다. 3) 생석회를 이용한 하수슬러지의 최종생성물 은 농가 보급판로만 개척된다면 부산물 비료나 토지개량제로서도 사용이 가능하기 때문에 그 효과는 엄청날 것으로 판단된다. 4) 최종생성물의 성분을 살펴보면 유기물 함량은 투입원료에 따라 약간의 차이는 있으나 대개 11-13%로 현행 퇴비기준 25% 에는 미달하는 것으로 나타났다.
고승오,신효근,김현기,홍기환,서정환,고도홍 한국음성과학회 1998 음성과학 Vol.3 No.-
Velopharyngeal function refers to the combined activity of the soft palate and pharynx in closing and opening the velopharyngeal port to the required degree. In normal speech, during the production of oral consonant sounds elevation of the soft palate, along with the superior constrictor muscle, occludes the oropharynx from the nasopharynx. Inadequate velopharyngeal function caused by congenital or acquired insufficiency or incompetency may result in abnormal speech characterized by hypernasality, nasal emission and decreased intelligibility of speech due to weak consonant production. The speech aid is often helpful in improving the speech of individuals with velopharyngeal incompetency. In this article, the pathogenesis and treatment of velopharyngeal incompetence are discussed and a speech aid appliance that was constructed for the patient is described. Keywards : velopharyngeal, hypernasality, speech aid, pathogenesis