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최낙일,강영진,송문규 원광대학교 2003 論文集 Vol.31 No.-
In this paper, path loss and delay profile characteristics are measured in the subway platform. To evaluate the fading characteristics of the measured signals, the standard deviations are computed. The standard deviation is bigger for shorter distance. The shorter the distance, the bigger the phase difference between direct wave and reflected waves according the distance, which results in heavy fading. To compute the path loss according to distance, the average values of path loss exponent(n) is evaluated. The path loss exponents measured in the subway environment for Omni-VP(omni-directional vertical polarization) antenna and CP(circular polarization) antenna are 1.418 and 1.680, respectively, which are considerably less than 2.0, the free space path loss exponent.
崔洛日 全北大學校 1987 論文集 Vol.29 No.-
The potential (capacity) output of an economy (or sector, or firm) is the output that would be realized if the resources of the economy (or sector, or firm) are fully utilized, and labor and capital were used at normal intensity. In this sense, the measure of the term has been used widely as an indicator of performance of an economy. Practically, however, there are a number of different concepts and methods of measurement depending upon the conditions under consideration such as demand and supply condition, time span and market mechanism etc, of which supply condition is very important because the term is a production concept. Furthermore, the measure of capacity output or capacity utilization rate is an important explanatory variable in explaining investment, inflation, export and import-hence balance of payment, growth and employment. In this paper, the concept and the method of measurement of the term is reviewed and the price and investment equations in which the measure of the term enters as an explanatory variable are presented.
주권선 전류검출에 의한 단상유도전동기의 구동시스템 구현
최낙일(N.I Choi),박수강(S.K Park),오금곤(K. G Oh),백형래(H.L Baek),임양수(Y.S Lim),오기진(K.J Oh) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
A Single phase induction motor is the predominant fractional horsepower power rated, extensively used in domestic and industrial applications. For example, these motors provide the motive power to washing machines, fans, refrigerators, etc. In this paper, single phase induction motor input current was detected by a small current transformer and determined TRIAC gate signal by using op-amp analog circuit. The soft-start strategy is based on limited auxiliary current angle during starting period in the closed-loop control. The Simulation and experimental result show the motor's starting and are compared with centrifugal switch starting motor.
O-Cresol의 活性炭吸着에 있어서 粒子內 有效擴散係數
崔洛萬,金東潤 부산대학교 환경문제연구소 1984 環境硏究報 Vol.2 No.-
To get some understanding on a mechanism of a activated carbon adsorption of o-Cresol which is considered as a pollution organic substance and to find out an effective pore diffusivity which is shown as an important design variable for packing bed tower on the activated carbon adsorption, this experiment was carried out in a batch reactor with 170×250 mesh granular activated carbon (GAC). To compare the size of adsorption mass transfer resistance between effective pore diffusivity and free diffusivity in water, the free diffusivity of o-Cresol in water was calculated by Hayduk-Laudie method. Results obtained were as follows 1) ?? 2) ?? 3) ??