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동적 장면을 지원하는 효율적인 광선 추적 하드웨어에 대한 FPGA상에서의 구현
박우찬,이진영,김정길 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.4
In this paper, our ray tracing hardware is implemented on the latest high-capacity FPGA board. The system included ray tracing hardware for rendering and tree building hardware for handling dynamic scenes. The FPGA board used in the implementation is a Xilinx Alveo U250 accelerator card for data centers. This included 12 ray tracing hardware cores and 1 tree-building hardware core. As a result of testing in various scenes in Full HD resolution, the FPS performance of the proposed ray tracing system was measured from 8 to 28. The overall average is about 17.7 FPS.
X-ray Data Analysis to Search for Magnetar Candidates in the Galactic Plane
박우찬,안홍준 한국우주과학회 2018 Journal of Astronomy and Space Sciences Vol.35 No.3
We report on our Galactic plane searches for magnetars in the archival Chandra X-ray Observatory (CXO) data. We summarize the properties of known magnetars and use them to establish a procedure for magnetar searches. The procedure includes four steps: source finding, spectral characterization, optical counterpart checks, and period searches. We searched 1,282 archival CXO observations, found 32,838 X-ray sources, and selected 25 intriguing candidates using the developed procedure. Although we do not firmly identify a magnetar among them, we significantly reduced the number of targets in future magnetar searches to be done with better X-ray telescopes.
광선 추적법 텍스쳐 매핑을 위한 MIP-Map 수준 선택 알고리즘 연구
박우찬,김동석 한국게임학회 2010 한국게임학회 논문지 Vol.10 No.4
본 논문은 광선 추적법 텍스쳐 매핑에서 MIP-Map 알고리즘 사용 시 텍스쳐 이미지들의 MIP-Map 수준을 선택하는 효과적인 방식을 제안한다. 이는 렌더링 시 물체와 교차하는 광선의 길이만을 사용하여 해당 물체의 텍스쳐 MIP-Map 수준을 선택하는 방법이다. 본 방식은 MIP-Map을 지원하지 않는 방식에 비하여 텍스쳐 알리아싱 면에서 우수하고 성능 저하는 미비하다. This paper proposes an effective method to select MIP-Map level of texture images for ray-traced texture mapping. This MIP-Map level selection method requires only the total length of intersected ray. By supporting MIP-Map for texture mapping, we can reduce the texture aliasing effects, while our approach decreases rendering performance very slightly.

박우찬,이종서,김응국,장석균,이재학,주상용 ( Woo Chan Park,Jong Seo Lee,Eung Kook Kim,Suk Kyun Chang,Jai Hak Lee,Sang Yong Choo ) 대한소화기학회 1992 대한소화기학회지 Vol.24 No.4
This is a report of study on 60 cases with upper gastrointestinal (UGI) bleeding, who were teated by operation at department of surgery in St. Marys hospital, Seoul, Korea, over a period of 10 years from Jaunary, 1981 to December, 1990. (continue...)