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실시간 입자 기반의 혈관조영 영상 렌더링을 위한 격자 기반의 밀도 계산 방법
이종범(Jongbeom Lee),김명진(Myeongjin Kim),이두용(Doo Yong Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This paper proposes a grid-based density computation which is required to render the images in real-time particlebased angiography simulation. Angiography images are computed according to the density distribution of the materials in the line of X-ray. A uniform grid is designed to approximate the density distribution of the used contrast medium. The density at each grid point is computed from the adjacent particles. Auniform hash is used to reduce the computation time of the density for the real-time simulation. The proposed method renders angiography images with an average computation time of 12.89 ms for each frame.
실시간 혈관조영술 시뮬레이션에서 심장박동으로 인한 혈관의 움직임을 생성하는 방법
이종범(Jongbeom Lee),김명진(Myeongjin Kim),이두용(Doo Yong Lee) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.7
본 논문에서는 현실감 높은 혈관조영술 시뮬레이션을 위해서 심장박동으로 인한 혈관의 움직임을 실시간으로 계산하여 렌더링(rendering)하는 방법을 제안한다. 혈관의 움직임을 시뮬레이션에서 생성하기 위해서는 심장박동에 따른 혈관의 삼차원 변위가 필요하다. 두 가지 다른 방향에서 촬영된 혈관조영술 엑스선 영상에 절점들을 각각 설정한 뒤 절점들의 위치를 정합하여 변위를 계산한다. 각 절점에서 계산된 변위로부터 전체 혈관의 움직임을 계산하기 위해 절점 변위에 따라 주변의 혈관 이미지를 선형으로 사상(mapping)하였다. 제안된 방법의 평균 계산시간은 6.05 ms로서 실시간으로 혈관의 움직임을 표현할 수 있는 것을 확인하였다. 제안된 방법으로 렌더링 된 혈관의 움직임을 시술을 수행하는 전문의와 전문의료기사에게 평가 받아 현실감을 검증하였다. This study proposes a method to generate realistic rendering of the cardiac motion of blood vessels, induced by the motion of the heart during a real-time angiography simulation. Three-dimensional displacements are required to generate the cardiac motion of the blood vessels. Nodes are selected on the X-ray images of the blood vessels captured in two camera views. Displacements of the blood vessels are obtained by registering the positions of the nodes. The images of the blood vessels are linearly mapped according to the displacement of each node to render overall cardiac motion of the blood vessels. Average computation time is 6.05 ms for each frame, which satisfies the real-time constraint. Experienced doctors and technicians are questioned to evaluate the realism of the rendering of the cardiac motion of the blood vessels.
실시간 혈관조영술 시뮬레이션에서 심장박동으로 인한 혈관의 움직임을 생성하는 방법
이종범(Jongbeom Lee),김명진(Myeongjin Kim),이두용(Doo Yong Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This paper proposes a method to generate the movement of blood vessel results from the motion of heart in the realtime angiography simulation. The displacements of the blood vessel in three dimensions are obtained by matching the displacements of the blood vessel on the actual angiography images captured at two different camera angles. The displacements of each point are mapped to the corresponding points of simulation model with the similar structure. The rendered blood vessel is translationally moved on the image rendering plane according to the information of three-dimensional displacement. The proposed method generates similar movement of the blood vessel with the actual angiography images. An average computation time is 6.05 ms for each frame.
고온 비대칭압연이 알루미늄 합금의 미세조직과 성형성에 미치는 영향
정무섭,이종범,한준현,Jeong, Museob,Lee, Jongbeom,Han, Jun Hyun 한국재료학회 2019 한국재료학회지 Vol.29 No.10
In order to analyze the effect of hot asymmetric rolling on the microstructure and texture of aluminum alloy and to investigate the effect of the texture on the formability and plastic anisotropy of aluminum alloy, aluminum 6061 alloy is asymmetrically rolled at room temperature, $200^{\circ}C$, $350^{\circ}C$, and $500^{\circ}C$, and the results are compared with symmetrically rolled results. In the case of asymmetric rolling, the equivalent strain (${\varepsilon}_{eq}$) is greatest in the upper roll part where the rotational speed of the roll is high and increases with increasing rolling temperature. The increase rate of the mean misorientation angle with increasing temperature is larger than that during symmetrical rolling, and dynamic recrystallization occurs the most when asymmetrical rolling is performed at $500^{\circ}C$. In the case of hot symmetric rolling, the {001}<110> rotated cube orientation mainly develops, but in the case of hot asymmetric rolling, the {111}<110> orientation develops along with the {001}<100> cube orientation. The hot asymmetric rolling improves the formability (${\bar{r}}$) of the aluminum 6061 alloy to 0.9 and reduces the plastic anisotropy (${\Delta}r$) to near zero due to the {111}<110> shear orientation that develops by asymmetric rolling.
권순찬(Soonchan Kwon),이범석(Beomseok Lee),이종범(Jongbeom Lee),유혜린(Hyerin You),김민영(Minyoung Kim),박재현(Jaehyun Park) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
전국대학교로켓연합회(NURA)에서는 매년 로켓 발사대회를 개최한다. 본 동아리에서는 아마추어 로켓의 동체, 추진, 사출, 소프트웨어를 연구해왔지만, 전체 시스템을 통합하지 못했다. 따라서 지속적인 대회 참가 및 도전 과제 수행을 위해, 본 동아리의 표준 발사체를 정립할 필요가 있었다. 본 연구에서는 KNSB를 이용한 약 300N급 아마추어 고체 로켓을 설계 및 제작하고, 안정적인 로켓 회수를 위해 피스톤과 화약을 이용한 낙하산 사출장치를 제작했다. TMS(Thrust Measurement System)를 이용하여 모터의 추력과 안정성을 확인했다. 아두이노 나노를 이용해서 사출장치 동작을 확인하고, 실험용 동체를 제작하여 지상에서 화약 사출 실험을 수행했다. 또한 통합된 모델을 발사 및 회수했으며, 아두이노 메가를 이용해서 비행 데이터를 확보했다. An annual amateur rocket launch contest is held by ‘National Universities Rocket Association’ called NURA. The GNU(Gyeongsang National University) Rocket team has been studying an amateur rocket motor, parachute ejection and software, respectively. However, failed to integrate all the systems as a single rocket. Therefore, to develop the standard model rocket had been highly required in order to consistently participate in the ‘Amateur Rocket Contest’ and also to impose a creative mission to the rocket. In this study, KNSB propellant had used for the rocket motor and the parachute ejection system which enables the rocket to be safely recover has designed to use a piston and gunpowder. The performance of the motor was verified by the TMS(Thrust Measurement System) experiment. Arduino Nano is used to operate the parachute deployment system and the ejection experiment had been performed with the test model. The integrated flight model(FM) lifted off and safely recovered. The flight data had successfully obtained by Arduino Mega.