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김만배(Manbae Kim),박창용(Changyong Park) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The In this study, the heat transfer and pressure drop characteristics were measureed for a brazed plate heat exchanger (BPHE) operated as an evaporator. The plate pattern of the BPHE was a chevron type and its number of plate was 10. The working fluid was R22 as a refrigerant and water was cooled in the BPHE. For the measurement of the evaporation characteristics, the evaporation temperature was set about 20℃ and the mass flux was controlled about 35 ㎏/㎡s . The average vapor quality was controlled at the range of 0.15-0.6. The average heat transfer coefficients decreased significantly over the vapor quality of 0.5. However, the pressure drop continuously increased to the vapor quality up to 0.6. The measured heat transfer coefficients before the vapor quality of 0.5 ware higher than the calculated values by the previously proposed correlations for the plate heat exchangers with evaporation, which could be caused by the smaller hydraulic diameter of the tested BPHE.
길종인,최황규,김만배,Gil, Jong In,Choi, Hwang Kyu,Kim, Manbae 한국방송∙미디어공학회 2012 방송공학회논문지 Vol.17 No.6
Recently, 3DTV and 3D displays have been released in the market. Accordingly, the production of stereoscopic images has gained much interest. Stereoscopic image being composed of left and right images are currently delivered to viewers without any modifications. The researches on the enhancement of depth perception using high-frequency components and the re-production of natural color by color compensation have been carried out for 2D images. The application of such 2D technologies to 3D stereoscopic images is an aim of this paper. This paper proposes the enhancement of 3D perception by color transformation. For this, we propose a stereo matching method for obtaining a depth map and two color transformation methods such as contrast transformation and background darkening. The effectiveness of the proposed method was verified through experiments. 최근 3DTV 및 3D 디스플레이가 공급되면서 입체영상 제작도 활발히 진행되고 있다. 입체영상은 좌영상과 우영상으로 만들어지는데, 제작된 입체영상은 수정 없이 그대로 시청자에게 공급되고 있다. 2D 영상도 고주파 성분을 이용하여 깊이감을 높이고, 색보정을 거처 자연색과 유사한 색을 재현하는 등의 연구는 오랫동안 진행되어 왔다. 이 기술을 입체영상에 적용하고자 하는 것이 본 논문의 목적이다. 기 제작된 입체영상의 컬러를 변환함으로써 3D 입체감을 개선하는 방법을 제안한다. 이를 위해서 본 논문에서는 스테레오 영상으로부터 깊이맵을 획득하고, 기존 컬러 변환을 통한 2D 영상의 지각 깊이감 개선을 입체영상에 적용하여, 3D 입체감을 향상시키는 방법을 제안한다. 이를 위해 스테레오 정합 방법과 컬러 변환 방법으로 대조 변환 및 배경 다크닝 방법을 제안하고, 실험을 통해 제안 방법이 상기 목적을 얻을 수 있는 것을 검증하였다.