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김철기,김재휘 한국농공학회 1984 한국농공학회논문집 Vol.26 No.4
The purpose of this study is to find out the determination method of designed duty of water in the rice fields through the comparison of the net unit duty of water at the late reduction division to heading stage with that at the planting stage. The data used for analysing this problem are the data of precipitation and gauge evaporation observed by Cheong-ju Meterological Center, the coefficient of evapotranspiration by College of Agriculture, Chung Buk University and the data of transplanting progressing in Boun area. The results obtained from this analysis are summarized as follows. 1.The occurring year of 1/10 probability value for available precipitation, gauge evaporation and mean maximum daily evapotranspiration during growing season is the year of 1977. 2.The 1/10 probability values of mean maximum evapotranspiration per day under the production rate of 1, 400kg/l0a and 1, 500kg/10a based on the weight of dry matters are 9. 2mm/day and 9. 6mm/day, respectively. 3.The net unit duty of water required in the fields that the maximum planting rate exists is more than the one in the fields that the planting rate is uniform in the planting stage. 4.The determination of net unit duty of water in the late reduction division to heading stage or the planting stage depends upon the daily evapotranspiration and percolation rate in the late reduction division to heading stage or the water depth required for planting and daily consumptive use of water after planting at the planting stage. Therefore the use of figure 5-(1) to figure 5-(6) can easily make the determination of the designed net unit duty of water out of above two kinds of net unit duty of water.
Effects of Head Rotation and Head Tilt on Pharyngeal Pressure Events Using High Resolution Manometry
김철기,류주석,송선홍,구정회,이경덕,박희선,오영율,민경훈 대한재활의학회 2015 Annals of Rehabilitation Medicine Vol.39 No.3
Objective To observe changes in pharyngeal pressure during the swallowing process according to postures in normal individuals using high-resolution manometry (HRM).Methods Ten healthy volunteers drank 5 mL of water twice while sitting in a neutral posture. Thereafter, they drank the same amount of water twice in the head rotation and head tilting postures. The pressure and time during the deglutition process for each posture were measured with HRM. The data obtained for these two postures were compared with those obtained from the neutral posture.Results The maximum pressure, area, rise time, and duration in velopharynx (VP) and tongue base (TB) were not affected by changes in posture. In comparison, the maximum pressure and the pre-upper esophageal sphincter (UES) maximum pressure of the lower pharynx in the counter-catheter head rotation posture were lower than those in the neutral posture. The lower pharynx pressure in the catheter head tilting posture was higher than that in the counter-catheter head tilting. The changes in the VP peak and epiglottis, VP and TB peaks, and the VP onset and post-UES time intervals were significant in head tilting and head rotation toward the catheter postures, as compared with neutral posture.Conclusion The pharyngeal pressure and time parameter analysis using HRM determined the availability of head rotation as a compensatory technique for safe swallowing. Tilting the head smoothes the progress of food by increasing the pressure in the pharynx.
김철기,신동찬 한국음향학회 1985 韓國音響學會誌 Vol.4 No.2
본 논문은 전 전자식 교환기에 사용되는 MFC 수신기를 설계하기 위해서 FIR-Filter를 사용한 논문이다. FIR-filter를 설계함에 있어서, Remetz Algorithm을 사용한 Mellellan의 방식이 적용되었으며 인접주파수를 정확히 구분하기 위하여 85차의 고차필터를 설계하였고, 필터의 출력 데이터 15개의 합으 로써 각 주파수에 대한 판별값으로 정하였다. 인접 주파수를 구분하는 출력 power의 결과는 최근의 FGT-MFC 수신기의 출력 power의 결과와 비교 하였을 때, S/N 비면에서 5dB 이상의 향상을 보였으 며, 133개의 입력데이타를 사용하는 FGT-MFC 수신기보다 4.2ms 빠른 응답특성을 나타냈다.