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조성철(Sung-cheoul Cho),김민준(Min-jun Kim),윤석원(Seok-won Yoon),원정훈(Jeong-hun Won) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.3
In this study, the seismic acceleration sensor inspection standard, which estimates the error rate of the sensor’s output voltage to test its linear ratio, was analyzed and an improved standard was proposed. Seismic acceleration sensors should be sensitive to small angular changes under seismic excitation; however, the existing inspection standard only calculates the error rates at 3 0°, 45°, 60°, and 90° angles. Thus, we proposed an improved inspection standard that measures error ratios in 5° increments from 0° to 90°. Since the linear ratio is determined by estimating the error rate between theoretical and measured output voltages, the error rates in the X, Y, and Z directions were analyzed at changing angles. The results indicate that the error rate increased at small installation angles, and that the error rate decreased gradually at smaller angular increments. The current inspection standard underestimated the actual error rate, as it represented only 40~50% of the average error rate measured by the 5° interval measurements. Therefore, the current inspection standard for estimating the linear ratios of seismic acceleration sensors should be improved to reflect the influence of variations in the error rate according to the angular increment.
尹錫元 동국지리학회 1988 東國地理 Vol.- No.9
The aims of this research are to study the formation causes and the development rpocess of the talus deposited in Nam-Myon area. The results of this study are summarized as follows: 1) The taluse deposited throughout this research area is generally divided into two strike groups. One is N10°-30°E and the other is N70°-85°E. Average value of dip is 40° and 35°-45°SE dominantly covers 78%. 2) The materials of talus are divided into three types based on the size of fragments. the size is bigger, sorting deviation is better; the size is smaller, it is worse. 3) The size distribution of talus fragments shows regular sorting from dip, but it also shows irregular sorting from strike. 4) Slope distance from the apex of the talus cone is fixed in proportion to the size of fragment, and fragment with 6-10 cm in diameter has the property of scattering throughout the whole surfaces. 5) Strike of talus on this research area corresponds. with that of joint sets of the bed rock, but dip does not. 6) The reason why talus is deposited throughout this research area is regarded as the climatic speciality, both of the high change of the frost days from November to April and of the high relative humidity by the influence of Soyang Lake.