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하이퍼루프 차량의 압축기 입구 유로 형상에 따른 유동 해석
홍상원(S.W. Hong),강형민(H.M. Kang),권혁빈(H.B. Kwon) 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.1
In this study, the flow analysis in the compressor inlet flow path at the front of the hyperloop vehicle driving inside the subvacuum tube was performed using CFD(computational fluid dynamics). It was verified that the pressure imbalance between the inlet cross section and inside the flow path and the pressure decrease inside the flow path of the CFD results using the original shape of the vehicle. Therefore, flow analysis was performed by changing the length of the lower side of the inner inclined surface of the inlet nose shape by 2 times and 4 times. As a result, the pressure decrease at the inlet cross section was delayed, and the pressure inside the flow path was maintained at a higher level than the original slope of the inlet nose shape. Finally, it could be confirmed that the lower gradient of the inner inclined surface of the inlet nose shape, the better pressure results of flow in the compressor inlet flow path in this study.
농촌 과소화 대응을 위한 마을 단위 농촌생활서비스 평가 모델의 개발 및 분석
홍상원 ( Hong Sangwon ),배승종 ( Bae Seung-jong ),김동현 ( Kim Dong-hyeon ),김수진 ( Kim Soo-jin ),김정태 ( Kim Jungtae ),장태일 ( Jang Taeil ) 한국농촌계획학회 2021 농촌계획 Vol.27 No.1
The degree of benefits of living services related to the quality of life can solve the depopulation problem, and it is necessary to be able to quantitatively analyze problems related to the quality of life in rural areas in order to cope with the rural depopulation. The purpose of this study was to develop the assessment model of a village-level rural living service that reflects the regional characteristics of rural villages to evaluate the level of rural living services for response rural depopulation. Based on the review of previous related studies, the evaluation index was composed of seven sectors of education, health, welfare, culture, environment, safety, and convenience, and the assessment model of a rural living service was established. This model was evaluated through a sample survey of 90 villages in Nonsan-si, Seongju-gun, and Pyeongchang-gun. As a result of the rural life services evaluation by Si and Gun, Seongju-gun, which is affected by nearby large cities, has the largest variation by village level and is assessed at a lower level overall than other Si and Gun. As a result of the rural life services evaluation by 7 sectors, in the case of health and welfare, low scores were shown in the assessment model, but the level of residents’ satisfaction was mid-level. In particular, in the case of Seongju-gun, there were significant differences in the assessment model and the survey results of the level of residents’ satisfaction in the health and welfare sectors due to the influence of nearby large cities. As a result of analyzing the number of villages corresponding to the top 30% and the bottom 30% of the evaluation results for each sector, it was analyzed that the villages with the highest evaluation results in Pyeongchang-gun in both the assessment model and the level of residents’ satisfaction. It implies that quantitative analysis of data based index and accessibility as well as level satisfaction of residents are necessary.