http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스마트도시기반시설의 설치 기준으로써 시간기준 활용을 위한 문헌 및 사례연구
방승환 사단법인 스마트도시건축학회 2023 사단법인 스마트도시건축학회 논문집 Vol.4 No.1
Smart city infrastructure is intelligent facilities through applying convergence of construction and information and communications technologies to facilities that city residents use together. Therefore, the installation standards for smart city infrastructure must follow those of facilities that city residents use together. This study aims to provide basic research data for future research on the use of time-based standards for smart city infrastructure. We analyzed relevant literature and cases to explore the meaning and practical applications of time-based standards. Through the study, we discovered that time is recognized as a means of overcoming the geographical limitations of urban space and symbolizing proximity services. Ultimately, it can be the goal of cutting-edge technologies, services, and urban development in smart cities. Finally, we found that the time-based standard can be used as an indicator that reflects the characteristics of users, their perception and feelings, and environment factors when evaluating the accessibility of facilities.
DME-Butane 혼합연료들의 분사 특성에 관한 실험적 연구
방승환 신한대학교 2021 신한대학교 논문집 Vol.44 No.-
This paper describes the effect of DME-Butane blended fuels on the injection characteristics in a high pressure diesel injection system. In this work, the blending ratios of Butane in the blended fuel are varied from 10 to 30% by weight ratio. An injection rate measurement system was constructed to analyze the injection properties of DME mixed with the Butane. As a result, the dispensing characteristics of DME-Butane mixed fuel and diesel fuel were well matched with the tendency to increase density and decrease viscosity. It was determined that the similar in test fuel injection delay time had an effect on the butane mixing ratio of the test fuel.
방승환 신한대학교 2021 신한대학교 논문집 Vol.44 No.-
The purpose of this study was to conduct a comparative study on the spray development characteristics of the fuel of the CI engine in which ethanol is mixed with biodiesel. Spray development characteristics of fuel mixed with 50% ethanol by weight in diesel fuel and biodiesel were compared and analyzed with DME, a meteorological fuel. In order to compare the spray development characteristics of the experimental fuel, the spray penatration and cross-sectional area of the spray were analyzed by fuel. The spray development process of the experimental fuel showed a similar trend until the beginning of spraying, but from the 0.9 ms region after spraying, biodiesel mixed with diesel and ethanol showed similar spray reaching distance, and in the case of spray angle, the spray angle was large and then showed a similar trend.
방승환 신한대학교 2022 신한대학교 논문집 Vol.제45집 No.-
The purpose of this study was to conduct a comparative study on the impingement spray development characteristics of the fuel of the CI engine in which 2 phases fuel is mixed with biodiesel and DME. Impingement spray development characteristics of fuel mixed with by 25% DME increses by weight in biodiesel were compared and analyzed with diesel fuel. In order to compare impingement the spray development characteristics of the experimental fuel, the spray penatration hight and cross-sectional area of the impinged spray were analyzed by fuel. The impinged spray development process of the experimental fuel showed a similar trend until the beginning of spraying. Depending on the characteristics of the experimental fuel, the development of spray after collision showed a difference in collision spray as the pressure of the atmosphere increased, and showed a different tendency depending on the mixing ratio of the two-phase mixed injection fuel. The change in the cross-sectional area of collision spraying showed a decrease as the mixing ratio of DME increased over time, and as the injection pressure increased, the difference in the experimental fuel price according to the mixing ratio increased more. In conclusion, the development of collision spraying is expected to change significantly depending on the change in the mixing ratio of two-phase mixed fuel, the difference in injection pressure, and the difference in atmospheric density.