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Hole-Filling Methods Using Depth and Color Information for Generating Multiview Images
남승우,장경호,반윤지,김혜선,진성일 한국전자통신연구원 2016 ETRI Journal Vol.38 No.5
This paper presents new hole-filling methods for generating multiview images by using depth image based rendering (DIBR). Holes appear in a depth image captured from 3D sensors and in the multiview images rendered by DIBR. The holes are often found around the background regions of the images because the background is prone to occlusions by the foreground objects. Background-oriented priority and gradient-oriented priority are also introduced to find the order of hole-filling after the DIBR process. In addition, to obtain a sample to fill the hole region, we propose the fusing of depth and color information to obtain a weighted sum of two patches for the depth (or rendered depth) images and a new distance measure to find the best-matched patch for the rendered color images. The conventional method produces jagged edges and a blurry phenomenon in the final results, whereas the proposed method can minimize them, which is quite important for high fidelity in stereo imaging. The experimental results show that, by reducing these errors, the proposed methods can significantly improve the hole-filling quality in the multiview images generated.
남승우,권영주 한국자치행정학회 2013 한국자치행정학보 Vol.27 No.2
2013년 1월 1일 현재 전국 227개 기초자치단체 중 225개소에서 주민참여예산제가 시행중이다. 본 연구는 주민참여 3단계이론에 근거 전국 225개 기초자치단체의 자치법규(조례와 규칙)를 분석하여 ‘민관협치형’, ‘민관협의형’, ‘관주도형’ 주민참여예산제로 그 유형을 분류하였다. 주민참여예산제의 유형에 미치는 영향요인으로 정치적 요인(단체장의 진보성향, 단체장의 득표율, 진보의원의 구성비율), 사회적 요인(주민투표율, 시민단체수), 행정적 요인(자치법규 제·개정시기), 통제변수(인구수, 총 예산규모, 재정자립도)를 설정하여 다항로지스틱 회귀분석방법으로 분석하였다. 분석결과 기초단체장의 정치적 성향이 진보적일수록 ‘관주도형’ 및 ‘민관협의형’ 보다 ‘민관협치형’ 주민참여예산제를 채택할 가능성이 높으며, 진보의원의 구성비율이 높을수록, 자치법규 제·개정시기가 2010년 7월 1일 이후일수록 ‘관주도형’ 보다 ‘민관협치형’ 주민참여예산제를 채택할 가능성이 높다는 점이 확인되었다. 또한, 주민투표율이 높을수록 ‘관주도형’ 및 ‘민관협의형’ 보다 ‘민관협치형’ 주민참여예산제를 채택할 가능성이 낮은 것으로 조사되었다. 이러한 연구결과는 주민참여예산제 유형의 영향요인을 최초로 분석·검증하였다는 점과 기초단체장의 진보성향, 진보의원의 구성비율 및 2010년 6월 지방선거 이후의 자치법규 제·개정이 ‘민관협치형’ 주민참여예산제를 채택하는 영향요인임을 검증하였다는 점에서 그 의의가 있다고 하겠다.
유동흐름 전류계를 이용한 정수장 고탁도 유입수 응집 제어 방법에 대한 연구
남승우,조병일,김원경,조경덕,Nam, Seung-Woo,Jo, Byung-Il,Kim, Won-Kyong,Zoh, Kyung-Duk 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.2
Objectives: This study was aimed at determining the optimum coagulation dosage in a high turbid kaolin water sample using streaming current detection (SCD) as an alternative to the jar test. Methods: SCD is able to optimize coagulant dosing by titration of negatively charged particles. Kaolin particles were used to mimic highly turbid water ranging from 50 to 600 NTU, and polyaluminum chloride (PAC, 17%) was applied as a titrant and coagulant. The coagulation consisted of rapid stirring (5 min at 140 rpm), reduced stirring (20 min at 70 rpm), and settling (60 min). To confirm the coagulation effect, a jar test was also compared with the SCD titration results. Results: SCD titration of kaolin water samples showed that the dose of PAC increased as the pH rose. However, supernatant turbidity less than 1 NTU after coagulation was not achieved for high turbid water by SCD titration. Instead, a conversion factor was used to calculate the optimum PAC dosage for high turbid water by correlating a jar test result with that from an SCD titration. Using this approach, we were able to successfully achieve less than 1 NTU in treated water. Conclusions: For high turbid water influent in a water treatment plant, particularly during summer, the application of SCD control by applying a conversion factor can be more useful than a jar test due to the rapid calculation of coagulation dosage. Also, the interpolation of converted PAC dose could successfully achieve turbidity in the treated water of less than 1 NTU. This result indicates that an SCD system can be effectively used in a water treatment plant even for high turbid water during the rainy season.