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딥 러닝 기반 프레임 보간을 이용한 SLAM 성능 개선
윤정수(Jungsu Yun),이현빈(Hyunbean Yi) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
This paper proposes a method to compensate for frame loss using a frame interpolation based on deep learning technique. When a frame loss occurs, a new frame is created between two frames using the RIFE (Real time Intermediate Flow Estimation) algorithm and used as the input image of SLAM (Simultaneous Localization and Mapping). Simulations were performed using the existing data set and it was verified that the camera position estimation was performed stably even at lower frame rates.
지구력 트레이닝시 근섬유의 수축 특성에 따른 HSP 70의 발현
윤정수 ( Yun Jeong Su ),고영호 ( Go Yeong Ho ),조형식 ( Jo Hyeong Sig ),김재철 ( Kim Jae Cheol ) 한국운동영양학회 2002 Physical Activity and Nutrition (Phys Act Nutr) Vol.6 No.3
It was the aim of this study to investigate the expression of MyoD andmyogenin protein in skeletal muscle by retraining. The male Sprague-Dawley rats underwent the treadmill running at the 55% of VO_(2) max (20m/min, 10°, 90min/day, 5days/week) during 2 weeks training, 4 weeks training, and 8 weeks training, respectively. The expression of HSP 70 in gastrocnemius and soleus muscles were examined by quantitative Western blotting. In the gastrocnemius higher than control. In the soleus increased in toe all group specifically, the higher in 8 weeks than other training groups. These results suggest that the HSPs plays importantly a role in the protection against the muscle damage and its exhibits different pattern in specific contractile property of the the skeletal muscle by the endurance training.
윤정수(Jeongsu Yun),윤성의(Sung-Eui Yoon) 한국컴퓨터그래픽스학회 2016 컴퓨터그래픽스학회논문지 Vol.22 No.3
본 논문에서는 번개의 물리적 특성을 고려하여 기존의 랜덤 트리 기반의 번개 경로 생성 알고리즘보다 사실적이며, 물리기반 시뮬레이션 알고리즘보다 빠른 번개 경로 생성 알고리즘을 제시한다. 절연 파괴 현상을 물리적으로 접근한 Dielectric Breakdown Model을 사용하고, 전위장(Electric potential field)의 특징을 빠르게 근사하여 번개의 경로를 생성하는 알고리즘을 제시한다. 또한, 장애물이 있는 복잡한 장면에서 번개가 장애물을 회피하는 가이드 경로 방법을 제시한다. 마지막으로, 번개 잔가지의 두께와 밝기 물리적 특성을 고려하여 빠르고 사실적인 번개를 렌더링한다. 본 논문에서 제시한 번개 경로는 약 1.56의 프랙탈 차원(Fractal dimension)을 가져 자연 현상의 번개와 유사한 결과를 보여주고, 기존의 물리 깁나 알고리즘에 비해 월등히 빠르게 경로를 생성한다. 다만, 실시간 게임에 적용 가능한 성능을 위한 추가적인 작업이 필요하고, 향후 GPU를 활용하여 번개 경로 생성 알고리즘을 개선하면 실시간 게임에 충분히 적용할 수 있을 것이라 판단한다. In this paper, we propose an algorithm for generating lightning paths, which are more realistic than those of random tree based algorithm and faster than a physically based simulation algorithm. Our approach utilizes physically based Dielectric Breakdown Method (DBM) and approximates the electric potential field dramatically to generate the lightning path. We also show a guide path method for the lightning to avoid obstacles in a complex scene. Finally, our method renders fast and realistic lightning by considering physical characteristics for the thickness and brightness of the lightning stream. Our result of the lightning path shares similarity to natural phenomenon by having about 1.56 fractal dimensions, and we can generate the lightning path faster than a previous physically based algorithm. On the other hand, our method is difficult to apply on the real-time games yet, but our approach can be improved by performing the path generation algorithm with GPU in future.
윤정수(Jeong-Su Yun),이은방(Eun-Bang Lee) 한국해양대학교 해사산업연구소 2003 海事産業硏究所論文集 Vol.13 No.-
Pusan Port as a world leading port puts its all effort in bring ocean going vessels and securing their traffic route by providing them information related marine safety and traffics through PTMS(Port Traffic Management Service Center). During two years of its operation, statistics of marine traffic accidents showed that many dynamic casualties such as collisions, groundings, and rammings has been decreased. However, due to increasing cargo volume, limited water area and unpredictable weather condition, potential risks still exist high. In this paper, in order to maximize the efficiency of PTMS and to reduce various risks in port management, we examine risk factors over operational results and experiences, and propose reasonable operational methods of PTMS.