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裵信徹,柳秀烈 단국대학교 1994 論文集 Vol.28 No.-
One way of reducing radiant heat transfer between surfaces is to use the shields which are made from highly reflective or lowly emissivitive materials. In this study, the surface temperature of tube type furnace and the radiation shields were measured in the vacuum bell-jar. The tube type furnace was made by stainless steel 304 foil with 0.03 mm and 0.05 mm. The experimental data were compared with theoretical results. Since the heat convection effects can be neglected due to experiment in vaccum chamber, and the heat conduction effects can be also neglected due to very thin the thickness of specimen, there are only the radiative heat transfer. To find the effect of shield numbers, the electric furnaces with the one to five shields were made. As the results, the energy consumption decrease as increasing the number of shields, and using lower emissivitive material. To determine the position placing the specimen for measuring the thermophysical properties, the surface temperature distribution in axial direction was measured and compared with theoretical results. Since the errors among the experimental and theoretical data were changed in the range of ±5%, the accuracy of the present method was verified. Although the maximum temperature of the furnace rise as increasing shield number, since the difficulties and tedious job in manufacturing the furnace with more numbers of shield beyond the arailability of the reducing the energy consumptions, the use of two or three shields can be recommended. Also it was found that the specimen should be placed in 52.2% midsection in axial length of the furnace, and the maximum temperature difference between the end and midsection of the furnace was 20 degree under the present condition.
배신철,김명윤,Bae, Sin-Cheol,Kim, Myeong-Yun 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.2
The theoretical model for the transient probe method is the modified Jaeger model which is used perfect line source theory. The transient probe technique has been developed for the simultaneous determination of thermal conductivity, diffusivity and volumetric heat capacity of liquids. The Levenberg-Marquardt iteration method is adapted to obtain thermal property within nonlinear range. Experimental results of liquids were found to agree well with recommended thermal property data.
배신철,오기수,Bae, Sin-Chul,Oh, Ki-Soo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
It is studied that the measuring method of the spectral emissivity by using hemispherical mirror with an inclined observation hole. The in-service calibration method of mirror reflectivity is also dealed with. It is possible to apply this method on measuring emissivity of conductor or non-conductor.
주파수의 변화에 따른 원형관로내 층류맥동유동의 속도와 압력의 분포
배신철,모양우,Bae, S.C.,Mo, Y.W. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
In this paper, the fundamental equations are developed for the pulsatile laminar flow generated by changing the oscillatory flow with $0{\leq}f{\leq}48Hz$ into a steady one with $0{\leq}Re{\leq}2500$ in a rigid circular pipe. Analytical solutions for the wave propagation factor k, the axial distributions of cross-sectional mean velocity $u_m$ and pressure p are schematically derived and confirmed experimentally. The axial distributions of centerline velocity and pressure were measured by using Pitot-static tubes and strain gauge type pressure transducers, respectively. The cross-sectional mean velocity was calculated from the centerline velocity by applying the parabolic distribution of the laminar flow and it was confirmed by using the ultrasonic flowmeter. It was found that the axial distributions of cross-sectional mean velocity and pressure agree well with theoretical ones and depend only on the Reynolds number Re and angular velocity $\omega$.
도열병균(Magnaporthe grisea)의 Ribosomal DNA의 ITS II 부위 핵산 염기서열을 이용한 균주간 근연관계 비교
배신철,이신우,이인구,예완해,류진창 한국식물병리학회 1996 Plant Pathology Journal Vol.12 No.1
벼도열병균 14개 균주와 벼 이외 화본과 식물 도열병균 12개 균주를 대상으로 rDNA의 ITS II 부위를 증폭하여 그들의 핵산 구조 차이를 분석함으로 도열병균 균주간 분류를 시도하였다. 5.8S rDNA의 3`-말단 부위와 28S rDNA의 5`-말단 부위의 sequence 중 5`-CCCGGGAATTCGCATCGATCGATCGAATGAAGA-ACGCAGC-3`와 5`-CCCGGGATCCTCCGCTTATT-GATATGC-3`를 이용하여 PCR 증폭을 하였을 때 벼도열병균 14개 균주는 동일한 길이의 단일 밴드를 형성하였으며 벼 이외 화본과 식물 도열병균에서는 레드톱 식물로부터 분리한 도열병균만이 나머지 균주보다 38bp가 더 큰 길이를 가진 밴드를 형성하였다. PCR로 증폭된 DNA를 HaeIII와 MspI 제한효소로 절단하였을 때 벼도열병균 레이스간에는 제한효소 절단에 의한 전기영동 밴드 형태 차이를 관찰할 수 없었으나, 벼 이외 화본과 식물 도열병균 12개 균주는 3군으로 구분할 수 있었다. 벼도열병균 90=054와 강아지풀에서 분리한 도열병균 G90-5, 기장에서 분리한 G88-4, 바랭이에서 분리한 G88-5 그리고 레드톱에서 분리한 RT 균주의 ITS II 부위의 DNA 염기서열 비교 분석에 의하면 G88-4와는 다른 HaeIII와 MspI 제한효소 위치를 가지고 있었기에 제한효소 절단에 의한 전기영동 형태가 상이하였다. 또한 RT균주는 HaeIII와 MspI위치가 존재하지 않았다.
裵信徹,金泰甲 단국대학교 1989 論文集 Vol.23 No.-
Serveral transient techniques were used for measuring the thermal diffusivities of fibrous insulating meterials. The transient technique use din the present study was the constant temperature plate method. The mathematical model of the CTP method is based on a semi-infinite slab with finite thickness, with the front of the slab modeled at constant temperature and the rear face as being maintained at the initial temperature. At time zero, the sample was placed for several minutes on a hot plate maintained at constant temperature. The temperatures of both sample on a hot plate maintained at constant temperature. The temperature of both sample faces were measured as a function of time to confirm the boundary conditions. Temperature of an interior position of the sample were measured and were used to calculate the termal diffusivity. The boundary conditions were satisfied during the time from zero to the time just before the rear face temperature started to rise. The thermal diffusivities of NBS, blanket, made in U.S.A. and several insulators made in Korea were measured about 300℃ to confirm the accuracy of the experimental apparatus.
裵信徹,金榮殷 단국대학교 1984 論文集 Vol.18 No.-
To determine the thermal diffusivity coefficient Green function was applied. With its derived results experiment was performed to find its coefficient with flash method technique. Copper alloy was used as an experimental material and rolling process was applied to produce different anisotropy. Anisotropic effect, increased with increase of percent reduction in thickness, prevented thermal conductivity and its characters were investigated with measured thermal diffusivity in experiment.