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이창석 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-
An oscillator for the B-WLL system is designed using a novel design methodology proposed in this paper. The device-line method which have been used recently have an advantage to estimate the output power and optimum matching impedance exactly when the terminating resonance circuit is fixed. In designing an oscillator with lossy resonance circuit, it is very difficult to decide the optimum termination condition for maximum output power and minimum phase noise. The maximum available power contour with respect to termination impedance that is shown here at first and the frequency response of the resonance circuit should be used concurrently to determine the optimum terminating impedance. And the figure of merit proposed in this paper should also be used with the forementioned contour. The designed circuit Using 0.25um HEMT library exhibits output power of 8.3 ㏈m at the frequency of 25.5 ㎓ with 9 ㎃ current ar 5V supply voltage.
인공산성빗물이 소나무의 조직, 수분수지 및 생장에 미치는 영향
이창석,길지현,유영한 한국생태학회 1998 Journal of Ecology and Environment Vol.21 No.2
To clarify the effects of acid precipitates on histological damage, water status, and growth of Pinus densiflora green house experiment applyin simulated acid rain was carried out. Contact angle of water droplet on needles of P. densiflora seedlings treated with simulated acid rain of different pHs simulated acid rain was, the more rapid transpiration was. Leaf water potential after water withdrawal was also reduced rapidly in proportion to acidity of simulated acid rain. Height growth of P. densiflora seedlings treated with simulated acid rain of pH 2 decreased, while growth of seedlings treated with that of pH 3 and 4 increased comparing with that treated with normal rain of pH 5.6. pH of cultivated soil in pH 2 plot was acidified with the amount of simulated acid rain applied but that in pH 3 and 4 plots did not show any directional change. From those results, it could be interpreted that decrease of height growth in pH 2 plot was originated from multiple effects of water deficit from rapid transpiration and soil acidification. On the other hand, increased of height growth in pH 3 and 4 plots would be originated from the supply of N and S included in simulated acid rain.