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김성구(Sunggoo Kim),이성길(Sungkil Lee) Korean Institute of Information Scientists and Eng 2016 정보과학회논문지 Vol.43 No.4
Deferred Shading is a shading technique that postprocesses pixels in the screen space, following geometry-only rendering passes with depth buffering. Unlike typical shadow mapping techniques, this technique allows us to render shadows from multiple light sources without changing the structure of the rendering pipelines. This paper presents a deferred shadow mapping technique and its extension to soft shadows using mipmapping. Our technique first generates visibility maps from light sources, and blurs the visibility maps for deferred shading. This strategy leads to efficient soft-edged shadows, but does not incorporate depth variation, producing light bleeding to some extent. In order to suppress the light-bleeding artifacts, we also propose a depth-adaptive mipmap sampling technique in the screen space.
장배관 및 고낙차를 고려한 멀티형 히트펌프 시스템의 성능특성에 관한 수치적 연구
송재선(Jaesun Song),이선일(Sunil Lee),정현준(Hyunjoon Chung),김용찬(Yongchan Kim),김성구(Sunggoo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The performance of a multi-type heap pump system was degraded with the increases of pipe length and head when it was installed in buildings. To investigate the performance of a multi-type heat pump according to pipe length and head, a simulation model containing five modules of a compressor, evaporator, condenser, electronic expansion valve, and pipes was developed in the heating and cooling mode operation. The system was composed of one outdoor unit with a 10 HP compressor, and five indoor units. The maximum length and head of the pipe were 100 m. The simulation results showed that the system capacity was more affected by the pipe head than the length. The pipe length had less effects on the system performance in the cooling mode than that in the heating mode.