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The flow distributions in the hollow fiber module were investigated numerically with the modified finite difference scheme. The non-uniformity in the flows through the fibers depended on the manifold design, the Reynolds number, the packing density and the pressure drop along the fibers. With the conical manifolds, local minimum velocities occur in the fibers near the center and at the periphery of the fiber module. With the cylinderical manifolds, local minimum velocity occurs only in the fiber near the center. These phenomena become more significant with the smaller pressure drop through one fiber and the higher Reynolds number. The performance of the hollow fiber reactor due to the non-uniform flow distribution in the fiber module was also investigated. The performance of the hollow fiber reactor was defined as the ratio of mass transfer rate in the reactor with non-uniform fluid distribution to that of the reactor in which the fluid flows equally through all fibers. The reactor with the cylinderical manifolds was superior to that with the conical manifolds in the view of the performance of the reactor. This phenomena became more prominent at higher Reynolds number and lower manifold height.
PDR(Pattern Dependent Run-length) 코드의 데이타 압축성능을 한글도큐먼트에 대해 기존 CCITT 표준코드인 modified-READ 코드와 비교하였다. 비교연구를 위해 한글도큐먼트에 적합한 PDR코드를 만들고 컴퓨터 시믈레이션을 통해 압축성능을 비교한 결과 PDR코드는 modified-READ 코드에 비해 약 14%의 압축이득을 나타냄을 보았다. 본 논문에서는 이미 본인에 의해 제안되고 그 성능이 입증된 PDR코드를 한글도큐먼트에 대해 적용해 봄으로써 우리나라 팩시밀리 장비에 효과적인 코드임을 확인하였다.
Fabricated a Hood which was adhered polyurethan form impregnated carbon powder in and loaded on the parabolic antenna side. Found the Hood absorbed sidelobes of microwave radiation energy from 2 dB to 9 dB for E-plane pattern and from 4 dB to 15 dB for H-plane pattern at d=4/3λ
The gaseous oxygen is more effective for the decarburization of Ni-Cr alloy and 18-8 stainless steel in Heroult type electric are furnace making process than iron ore. and it reduces the loss of Cr amount as the Cr-oxide states. The rate of decarburization of 18-8 stainless steel is 0.84% C/hr in the initial oxygen blowing period, after then it is increased by the diffusion of FeO and C and is decreased by the increasing of the MgO contents in slag.
The maximum Euclidean norm of the complementary signal response at samling times of the networks of which element values are within tolerance and are interconnected properly, is chosen as the criterion of GO-NO-GO decision. And using SPICE program, the fault detection resolution to single component parameter variations is determined about a 2-pole Butterworth filter and a 4-pole/2-zero Butterworth filter and it is shown that the maximum Euclidean norm of the output can be used as a simple criterion for fault detection.
The gas absorption effect semiconductors have been fabricated by sintering the mixture of tin dioxide and strondium carbonate in the molar ratio 1 : 0.3 at 600-1,000℃ for one hour. Their concentration of propane gas versus resistance characteristics were optained. The optimum sintering temperature-time combination was about 700℃-1hr, fixing the mixing molar ration 1 : 0.3. And the otpium concentration of HCI solution which was used to form the shapes was about 25%. The absorption effect semiconductors fabricated had not only absorption effect against protane gas but the same temperature-resistance characteristics as Negative Temperature Coefficient Resistors.
In this work, we have designed dc regulated power supply with variable internal resistance where output open circuit voltage and internal resistance are independently varied each other. The electrical characteristics observed in this power supply can be outlined as following: 1) Internal resistance can be varied equivalently in wide ranges from 0.2 to 500 ohms, 2) practically no vriation (within 0.02 percent per volt) is observed in output open circuit voltage when the internal resistance is varied, and 3) practically no variation (within 0.05 percent per ohm) is observed in internal resistance when the output open circuit voltage is varied.
The effects of alloying elements on the torsional characteristics of Al-Ni eutectic have been studied. Two types of eutectic structures were prepared; one was in as-cast state, and the other was directionally solidified. The results obtained are as follows. 1) Comparing directionally solidified Al-Ni eutectics with as-cast states, though modulus of rigidity and torsional strength decrease, ductility increases considerably. 2) The addition of Cr and Cu caused a considerable increase in the torsional strength of eutectic.