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新生兒臍帶血의 Immunoglobulin과 補體에 關한 硏究
尹東憲 中央醫學社 1977 中央醫學 Vol.32 No.1
The immunologic characteristics of newborn infants are quite different from adult, and might 'be much influenced by the immunologic characteristics of their mother. In this study, immunoglobulins and complement in cord blood and venous blood of mother were determined to define the immunologic characteristics of newborn infants and the immunologic interrelationship between newborn infants and their mothers. The concentration of IgG in cord blood of newborn infants was higher than that of their mothers and the concentration in venous cord blood was higher than in arterial cord blood. This suggests that the IgG of newborn infants is composed of not only the transfered IgG from their mothers but also the IgG produced by themselves. The concentration of IgA in cord blood was lower than that of their mothers and IgA in arterial cord blood was more than in venous cord blood. Complement C3 in cord blood of newborn infants was lower than in their mother. Considering the concentration of C3 in venous and arterial cord blood, most of the complement of newborn infants might come from their mothers.
염석원,윤동헌,윤동욱,고한석 한국음향학회 1998 韓國音響學會誌 Vol.17 No.8
본 논문에서는 한 쌍의 센서를 이용하여 미지의 수중 음향 신호의 시간지연의 차 (Time Delay Difference)를 추정하고 탐지하는 알고리즘을 다루고 있다. 전형적인 시간지연 차의 최적화 추정 기법은 두 신호의 상관관계(Cross Correlation)에 의한 ML(Maximum likelihood)추정으로 구할 수 있지만, 실제 수중 음향 환경 하에서 시간 지연뿐만 아니라 표 적의 이동에 의하여 발생하는 도플러 효과로 신호의 주파수도 변하게 된다. 이러한 신호 주 파수의 올바른 고려 없이 단순히 두 신호의 시간지연만을 추정하는 방법은 불가피한 에러를 생성하게 된다. 본 논문에서는 시시각각 변하는 시간지연의 차를 구하기 위한 준 최적화 기 법인 확률분포 함수의 Recursive Filter에 시간 지연 차와 도플러효과의 2차원 확률분포 함 수를 적용한 추정 알고리즘을 제안한다. 관측된 신호의 리샘플링(Resampling)을 통하여 도 플러 효과를 보상한 후 2차원 Conditional likelihood를 구하고 Projection과 Correction 과정 을 통하여 시간지연과 도플러 효과에 대한 사후확률을 구한다. 그리고 이러한 알고리즘을 가상 시나리오에 대한 모의실험을 통하여 평가한다.
Indium Tin Oxide (ITO) Coatings Fabricated using Nanoparticle Slurry and Sol
정덕수,윤동헌,김동환,임경란 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
Indium tin oxide (ITO) coatings were made using an ITO slurry and an ITO sol. This was achieved by dispersing nanosized ITO powder in a mixed solvent without any dispersant and developing an adhesive ITO sol from indium acetate and tin tetrachloride in a mixture of DMF and n-butanol. Coating was carried out in one step by spin coating an ITO slurry, which was then followed by an ITO sol over it. Here, the sol penetrates into the nano ITO particle layers to make them adhere to each other as well as to a glass substrate. This is then followed by sintering at 500℃ for 1 h to produce a uniform film consisting of ITO particles of about 50 nm and 10 nm. ITO films were obtained with sheet resistances from 450 to 1500 ohm/□ by varying spin speed and concentration. Transmittance is higher than 90% at 550 nm.
Indium Tin Oxide (ITO) Coatings Fabricated Using Mixed ITO Sols
정덕수,윤동헌,박상환,김창삼 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
ITO films were achieved by sintering at 500~550oC. This was possible by inducing a seeding effect on an ITO sol by producing crystalline ITO nanoparticles in situ during heat treatment. Two kinds of ITO sols (named ITO-A and ITO-B) were prepared at 2.0 wt% from indium acetate and tin(IV) chloride in different mixed solvents. The ITO-A sol showed a high degree of crystallinity of ITO without any detectable SnO2 on XRD at 350℃/1 h, but the ITO-B sol showed a small amount of SnO2 even after annealing at 600℃/1 h. The 10 wt% ITO-A//ITO-B showed the sheet resistance of 3600Ω/□, while the ITO-B sol alone showed 5200 Ω/□ by sintering at 550℃ for 30 min. Processing parameters were studied by TG/DSC, XRD, SEM, sheet resistance, and visible transmittance.