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신승협(Seunghyup Shin),신성용(Sung-Yong Shin) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1B
최근 실시간 가상 인물 애니메이션 시스템이 활발하게 보급되면서 피부 모양을 자연스럽게 유지하면서도 고속으로 동작할 수 있는 인체 변형 방법이 요구되고 있다. 본 논문은 가상 인물을 구성하는 메쉬의 정점들을 회전 연산만으로 이동시켜 실시간에 인체를 변형하는 모델을 제안한다. 인체 변형의 전처리 과정으로 드로니 삼각화를 이용하여 각 정점의 회전 기준이 될 관절을 찾는 방법을 제시하고, 사원수 형태로 입력된 동작을 회전축의 방향에 따라 분해한 후 각 정점에 차등적으로 적용하여 피부를 자연스럽게 변형할 수 있음을 보인다.
연소실 형상과 다중분사각 노즐이 디젤 연소 및 배기 특성에 미치는 영향에 관한 연구
신승협(Seunghyup Shin),노현우(Hyunwoo Noh),최승목(Seungmok Choi),이정우(Jeongwoo Lee),민경덕(Kyungdoug Min) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper presents characteristics of diesel combustion and emissions according to adoption of various combustion chamber shape and multi-spray-angle nozzle. Multi-spray-angle nozzle increases spray mixing by keep away from spray overlap. In this research, it is introduced different combustion chamber shapes. Combustion chamber shapes and injection timing affect emission characteristics due to change target area of spray in the combustion chamber. 7 holes in single row nozzle and 12 holes in double row nozzle were examined. To change combustion chamber shapes, single bowl piston as a reference and double bowl piston were used. Also, experiments were conducted according to different injection timing and injection pressure.
고 EGR 영역의 디젤연소에서 다단분사가 배기물질에 미치는 영향
이정우(Jeongwoo Lee),신승협(Seunghyup Shin),최승목(Seungmok Choi),민경덕(Kyungdoug Min) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Recently one of the main issues in diesel engine is reduction of emissions. Especially, NOx and PM are important because Euro 6 regulation which demands 55.6% NOx reduction is enforced in 2014. One of the effective ways to reduce engine-out NOx and PM emissions is a LTC method. LTC is implemented by high EGR rate to reduce oxygen concentration. Low oxygen concentration makes combustion temperature low and ignition delay much longer. So it suggests the possibility of reduction NOx and PM simultaneously. But because of low oxygen concentration, combustion efficiency is bad and CO and HC emissions are increasing sharply. To reduce the CO and HC emissions, many researches have been performed, especially about swirl motion. However there are a few papers about injection strategies on LTC to improve emission problem. So this paper focused on the effects of multiple injections on emissions when high EGR rate is applied. Experiments were done by sweeping the second injection timing form BTDC 46 CA to ATDC 10 CA. The result shows CO emission decrease drastically at some points with other emissions same level. So it can aid to maintain the stable combustion of LTC.