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패켓망 X.75 구간의 THROUGHPUT 감소 요인과 개선책에 관한 연구
박규태,김연태,박명구 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1
The aim of CCITT (International an Telegraph and Telephone Consultative Committee) X.75 Recommendation is to provide an efficient international data communication for packet network subscribers. International calls (Virtual circuit) through the X.75 link are characterized with various parameters. The throughout class of the parameters associated with Packet transmission and receiving speed of terminals is most important parameter due to the efficiency of data transfer. Sometimes, users feel that the actual throughout is less than the assigned value, connected to oversea's packet terminal. It is also found that dominant factors are propagation and bit error rate delay. We propose that the dominent delay factors are minimized by using submarine cables instead of the satellites, and bigger window sizes in the link level. All the research and analysis in this paper have been done under the REAL CIRCUMSTANCES.
宋連浩,權圭赫,金崧平 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1
In this work, we measured the surface excess of binary liquid mixtures of benzene and cycloexane on CuNaY Zeolite at 20, 25, 30 and 35℃. The relations between the mole fraction and the surface excess of the absorbate in the adsorbed phase were obtained from the thermodynamic analysis on the adsorption equilibrium of liquid mixtures. Excess properties in the absorbed phase were determined and which were satisfied with the themodynamic analysis. The surface excess and the mole fraction were experimentally obtained from the system of bezene-cyclohexane on CuNaY Zeolite and they were decreased with the temperature increase. Benzene was preferentially absorbed and the amount of adsorption of benzene was greater than that of cyclohexane.
디지탈 필타 설계에서 이동 평균법을 사용한 잡음제거 특성에 관한 연구
박규태,박명구,김연태 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1
The smoothing method, which is one of the noisy signal processing techniques, is used in order to process the data corrupted with Gaussian White Noise using 5,7 and 9 size window functions. A simple convolution averaging, polynominal curve-fitting and adaptive smoothing methods are used for smoothing. The maximum size of the window function for the simple convolution averaging method is 7, which is about 1/3 of the total sequence, because of the obvious distortion to the original signal. The distortion characteristics of ploynominal curve-fitting method is better than that of the simple convolution averaging method even though the S/N ratio of it is degraded by 3.77 dB for the window size of 5 and 3.63dB for the window size of 9. It is found that the characteristics of filtering of adaptive smoothing method is the best for the 25 sequence data judging from distortion inducement.
박규태,전중남,신태민,연창모 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.2
This study describes an interframe image coding method using motion compensated and classified vector quantization(MC-CVQ). In motion compensated vector quantization(MCVQ), it is very important to encode the significant block. Therefore, we propose the MC-CVQ which encodes the significant block in the motion compensated error image by the classified vector quantizer. We classify the significant blocks according to the positions of the significant vectors, and also classify the significant vectors into 15 classes according to the positions of the significant pels. The computer simulation shows that the signal-to-noise ratio and the average bits of MC-CVQ are 0.2-0.25 bits/pel and 35 to 37 dB, respectively.
100 kN Deadweight Force Standard Machine and Evaluation
Yon-Kyu Park,Min-Seok Kim,Jong-Ho Kim,Dae-Im Kang,Hou-Keun Song 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.7
A deadweight force standard machine is a mechanical structure that generates force by subjecting deadweights to the local gravitational field. The Korea Research Institute of Standards and Science (KRISS) developed and installed a 100 kN deadweight force standard machine for national force standards. It can generate forces from 2 kN to 110 kN in increments of 1 kN. The uncertainty of the force machine was estimated and declared as 2 × 10??. This 100 kN deadweight force machine was compared with the 500 kN deadweight force standard machine at KRISS and the 20 kN and 50 kN deadweight force standard machines at the National Metrology Institute of Japan (NMIJ). The measurement results showed good agreement between the deadweight force machines, and the accuracy level of the 100 kN deadweight force machine was verified.