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백종인,반용운,손철희,김유미 한국행정학회 2015 International Review of Public Administration Vol.20 No.1
The purpose of this study was to develop transportation justice indicators to be usedin assessing the level of transportation justice during the process of making and implementing transportation policies through a participatory approach. In line with this purpose, this study defined the concept of transportation justice through a literature review. To develop the indicators, first, principles or values related to transportation justice were identified via the literature review and focus-group interviews (FGIs). Second, preliminary indicators were collected based on the identified principles and values. Third, this study employed expert surveys and factor analysis to secure the objectivity of the preliminary indicators. Based on the factor analysis, the final version of the indicators included categories such as environmental friendliness. participation, safety and mobility. Environmental friendliness comprised ‘impact on the human body and the natural environment’ and ‘controlling and monitoring of air pollution.’ Participation consisted of ‘participation of and support for the mobilityimpaired.’ Safety included ‘safety of the movement of humans and cargo’ and ‘safety in using transportation facilities.’ Mobility referred to ‘accessibility to green transportation’ and ‘accessibility and convenience for the mobility-impaired.’ These intermediate categories were also composed of related indicators. This study implies that the developed transportation justice indicators may provide a foundation to resolve conflicts during the process of making and implementing transportation policies.
반도체패키지에서의 층간박리 및 패키지균열에 대한 파괴역학적 연구 (2) - 패키지균열-
박상선,반용운,엄윤용 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8
In order to understand the package crack emanating from the edge of leadframe after the delamination between leadframe and epoxy molding compound in an electronic packaging of surface mounting type, the M-integral and J-integral in fracture mechanics are obtained. The effects of geometry, material properties and molding process temperature on the package crack are investigated taking into account the temperature dependence of the material properties, which simulates a more realistic condition. If the temperature dependence of the material properties is considered the result of analysis conforms with observations that the crack is kinked at between 50 and 65 degree. However, in case of constant material properties at the room temperature it is found that the J-integral is underestimated and the kink crack angle is different form the observation. The effects of the material properties and molding process temperature on J-integral and crack angle are less significant that the chip size for the cases considered here. It is suggested that the geometric factors such as ship size, leadframe size are to be well designed in order to prevent(or control) the occurrence and propagation of the package crack.
이형식(Hyung-Sik Lee),하지훈(Ji-Hun Ha),반용운(Lyong-Oon Pahn),이상호(Sang-Ho Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Mufflers assembled in automobiles have general roles to change the high temperature and pressure of the exhaust gas from the engine into a state of low temperature and pressure, so that they improve the engine efficiency and reduce the noise. In this study, for automobile mufflers where the exhaust gas flows with the inlet condition of constant velocity, numerical flow analysis is carried out using steady state turbulent flow conditions, based on the 3D solid model. The maximum velocity inside the muffler is calculated as about 137m/s with the pressure drop between inlet and outlet being 6,275 Pa.