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격자 기반 공간보간 기법을 활용한 국내 PM10 자료의 시공간적 변동성 분석
이진욱(Lee, Jinwook),변종윤(Byun, Jongyun),황승현(Hwang, Seunghyun),전창현(Jun, Changhyun),백종진(Baik, Jongjin) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.1
본 연구에서는 2001년부터 2019년까지 관측된 국내 PM10 자료에 대한 시공간적 변동성 분석을 수행하였다. 이를 위해 연도별로 최소 175개에서 최대 484개의 지점 자료를 역거리가중법을 이용하여 공간보간하였다. 웨이블릿 분석을 통해 일평균 자료에 대한 주기적 변동성에 대해 검토한 결과, PM10은 약 1년 정도의 기간을 두고 규칙적으로 반복하는 것을 확인할 수 있었다. 월평균 및 연평균 자료에 대해 Mann-Kendall 검정을 적용한 결과, 1년에 약 1 μg/m3 정도 감소하는 추세를 보임을 확인하였다. 연평균 자료를 이용하여 격자 단위의 공간적 변화를 살펴본 결과, 북쪽으로 갈수록 상대적으로 PM10이 높게 나타났으며 시간이 지남에 따라 절대적인 관측값 및 편차가 상당히 감소된 것을 확인할 수 있었다. 전체 기간에 대한 연평균 자료들의 평균은 수도권 부근이 상대적으로 높은 것으로 확인되었으며, 표준편차에서도 유사한 경향을 확인할 수 있었다. This study analyzed spatiotemporal variability in domestic PM10 data from 2001 to 2019. From annual numbers of stations between 175 and 484, the point data at each station were spatially interpolated using the inverse distance weighted method. A periodic variability in daily mean data was examined through wavelet analysis, which showed that there was a clear annual pattern with the periodic change following a regular cycle. The Mann-Kendall Test for monthly and annual mean data showed a decreasing trend in about 1 μg/m3 per year. The spatial change in the grid data for annual mean data represented that it was relatively higher in the northern regions than that in the southern regions and its mean and deviation decreased significantly over time. For the entire period of observation data, it was found that annual mean and standard deviation of PM10 concentrations were relatively high in the region near the metropolitan area.
주행조건에 따른 무동력 트레드밀의 곡률반경별 주행안정성 비교 : Self-Paced Speed vs Fixed Speed
노종련(Jongryun Roh),형준호(Joonho Hyeong),황창현(Changhyun Hwang),김사엽(Sayup Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
An understanding of dynamic stability during running is of paramount importance for the prevention of falling and injury. Numerous studies on dynamic stability have focused on the characteristics of dynamic stability under self-paced speed (SS) and fixed-speed (FS) conditions. However, few studies have focused on the direct comparison of these two conditions. The recently introduced non-motorized curved treadmill (NMCT) has been proposed for use in experiments under both SS and FS conditions because it permits repetitive changes in running conditions through low friction and a curved running belt, as well as real-time control of steps using a metronome. In this study, the margin of stability (MOS), which is an index of dynamic stability, was evaluated for 16 healthy male adults under SS and FS conditions using an NMCT. The results of a two-way repeated-measures analysis of variance revealed an interaction between the radius of curvature and speeds (P<0.001). In addition, the results of a paired t-test confirmed a significant difference between the SS and FS conditions (P<0.05). The results of the experiment showed that under both SS and FS conditions, the dynamic stability increases as the radius of curvature increases during slow walking and fast walking (P < 0.05). However, under SS conditions, as the radius of curvature increases during running, the anterior–posterior margin of stability (MOSap) decreases (P<0.05), whereas no distinctive trend was detected under FS conditions (P>0.05). The results of this study can be used to enhance the capacity for exercise and the effects of rehabilitation exercise.