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막비등 영역에서 액적-벽면 충돌 시 충돌각도가 열전달에 미치는 영향에 관한 실험적 연구
박준석,김형대,Park, Junseok,Kim, Hyungdae 한국액체미립화학회 2017 한국액체미립화학회지 Vol.22 No.3
Effects of collision angle on heat transfer characteristics of a liquid droplet impinging on a heated wall above the Leidenfrost point temperature were experimentally investigated. The heated wall and droplet temperatures were $506^{\circ}C$ and $100^{\circ}C$, respectively, and the impact angle varied from $20^{\circ}$ to $90^{\circ}$ while the normal collision velocity was constant at 0.27 m/s. The droplet collision behaviors and the surface temperature distribution were measured using synchronized high-speed video and infrared cameras. The major physical parameters influencing upon droplet-wall collision heat transfer, such as residence time, wall heat flux, effective heat transfer area, heat transfer amount, were analyzed. It was found at the constant normal collision velocity that the residence time, wall heat flux and effective heat transfer area were hardly not changed, resulting in the almost constant heat transfer amount.
최신 컴퓨터 비전 기술을 활용한 캡슐내시경의 성능 개선
박준석 ( Junseok Park ) 대한내과학회 2021 대한내과학회지 Vol.96 No.3
Advanced computer vision technologies can be used to improve the performance of capsule endoscopy. Specifically, new technologies can be used to enhance the image quality of capsule endoscopes, which has previously been limited by mechanical constraints. The trajectory of a capsule endoscope, which can be estimated by reconstructing the captured images, helps to predict the location of lesions. Computer vision technology is utilized in a more practical way in a recently developed capsule endoscope comprising a stereo camera. Using this device, images can be interpreted in three dimensions, enabling more accurate measurements of size. The use of deep learning for image recognition is associated with an improved lesion detection rate and reduced reading time in clinicians. This evolving technology requires close cooperation between medical and IT professionals for optimized clinical use. (Korean J Med 2021;96:190-194)
박준석(Junseok Park),구영(Young Ku) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.8
Periodontitis is the most prevalent noncontagious disease. Periodontal probing for measuring probing depth (PD) and clinical attachment level (CAL) has been an important diagnostic tool to determine the presence and severity of periodontal diseases. For probing reproducibility, adroit probe handling with constant force is required.
박준석(Junseok Park),이창숙(Changsook Lee),엄기현(Kyhyun Um),조경은(Kyungeun Cho) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2
현재 게임 속에는 인간의 외양을 닮은 에이전트가 대거 등장한다. 에이전트는 게임 내에서 개발자가 설정한 목표를 달성하기 위해 행동한다. 그러나 설정된 목표를 위해 한정된 행동만을 하기 때문에 에이전트의 행동은 다분히 패턴적이다. 인간다운 행동을 하지 않음으로써 게임의 사실성 및 재미성을 떨어뜨리는 요인으로 작용하고 있다. 보다 사실적인 행동을 하는 에이전트를 만들기 위해서는 자율적으로 목표 설정이 가능해야 한다. 본 논문에서는 자율적인 목표를 선택하기 위한 동기 결정 기법을 제시한다. 본 연구에서 동기 결정 기법은 환경인지, 동기 비교, 목표 생성, 목표 실행의 4단계의 프로세스로 진행한다. 피라미드 동기 계층 이론을 참조한 동기 비교를 통해 동기를 결정한다.
Leidenfrost 온도 이상의 가열 벽면과 충돌 시 열전달에 대한 액적 온도의 영향
박준석 ( Junseok Park ),김형대 ( Hyungdae Kim ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.2
This study experimentally investigated the effects of droplet temperature on the heat transfer characteristics during collision of a single droplet on a heated wall above the Leidenfrost temperature. Experiments were performed by varying temperature from 40 to 100℃ while the collision velocity and wall temperature were maintained constant at 0.7 m/s at 500℃, respectively. Evolution of temperature distribution at the droplet-wall interface as well as collision dynamics of the droplet were simultaneously recorded using synchronized high-speed video and infrared cameras. The local heat flux distribution at the collision surface was deduced using the measured temperature distribution data. Various physical parameters, including residence time, local heat flux distribution, heat transfer rate, heat transfer effectiveness and vapor film thickness, were measured from the visualization data. The results showed that increase in droplet temperature reduces the residence time and increases the vapor film thickness. This ultimately results in reduction in the total heat transfer by conduction through the vapor film during droplet-wall collision.