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실시간 동적 3차원 환경에서의 효율적인 충돌탐지 알고리즘
이영호(Yung-Ho Lee),김성범(Seong-Beom Kim),정승원(Sung-Won Jeong),한대만(Dae-Man Han),한상진(Sang-Jin Han),구용완(Yong-Wan Koo) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅱ
본 논문에서는 실시간에 강체 운동을 하는 일반적인 모델사이의 효율적인 충돌검사 알고리즘을 제안한다. 기존의 경계볼륨 알고리즘에 계층적 구조를 적용하였다. 이는 볼록한 물체를 위한 보로노이 영역 기반의 충돌검사 알고리즘을 오목한 물체에도 적용할 수 있도록 확장한다. 추가적으로 빠르게 움직이는 물체에 대한 관통을 탐지하기 위해서 물체의 이동 경로에 대한 교차 검사를 진행한다. 구현된 알고리즘은 일반적인 응용에서 기대한 성능 향상을 얻을 수 있다.
고지의 효과적인 활용을 위한 in-situ 탄산칼슘 부착 방식의 연구 (1)
서영범(Yung Bum Seo),이민우(Min Woo Lee),이영호(Young Ho Lee),정재권(Jae Kwon Jung) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.5
In-situ CaCO₃ formation on recycled wood pulp was studied to improve optical property and filler attachment to the fiber furnish in papermaking. We tried to attach calcium oxide (CaO) to the recycled fibers, old newspaper (ONP) in this case, by using selected polymers before in-situ CaCO₃ formation reaction on fibers, and then, CO₂ was injected to the furnish until all the CaO on fiber surfaces was consumed. It was found that the attachment of newly formed CaCO₃ to recycled fibers became stronger by attaching CaO to the fibers before in-situ CaCO₃ formation reaction. It was expected that the polymers used for the attachment of calcium source to the fiber furnishes helped to keep the newly formed CaCO₃ strongly attached to the fiber surface as well as to retain the impurities associated with calcium source and recycled fibers, if any. In-situ CaCO₃ formation gave higher brightness and much less ERIC value in ONP sheet than the case when the equivalent amount of GCC was added to the furnish.
서영범(Yung Bum Seo),정재권(Jae Gwon Jung),이영호(Young Ho Lee),성용주(Yong Ju Sung) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.6
The increase of wet web solid content in wet pressing will save drying energy greatly. We applied wood flours as spacers to increase the old corrugated container (OCC) solid contents in wet pressing. The mixed furnish of OCC and wood flours of 3-5% (wt/wt) increased bulk and drainage rate, and by increasing wet pressing pressure, its solid content started to be higher than 100% OCC furnish at more than 50% solid content level. Addition of cationic starch and drainage aid to the mixed furnish increased solid content further up to around 2%. Cationic starch addition compensated or exceeded the loss of tensile and compressive strength caused by the addition of wood flour, but drainage aid did not. Cationic starch also improved the stretch of the OCC, which could mitigate cracking at folding in boxboard.
In-situ 탄산칼슘을 표면에 형성시킨 목분의 인쇄용지 적용가능성 연구
서영범(Yung Bum Seo),이영호(Young Ho Lee),정재권(Jae Kwon Jung) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.1
Wood flours can give high bulk and high stiffness in paper, but low brightness and low smoothness may prevent them from wide utilization in printing paper. Hydrogen peroxide bleaching and in-situ calcium carbonate formation on wood flours were compared in this study to find out the possibility of using either of them in printing paper. The results showed that the in-situ calcium carbonate formation method on wood flours had better possibility than bleaching method in respects of better smoothness and higher brightness in paper properties. Much higher yield and no water contamination were the economical advantage of using the in-situ CaCO₃ process on wood flours.