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가변 크기 블록에서 정수단위 화소 움직임 벡터의 빠른 검색
이융기,이영렬 대한전자공학회 2003 電子工學會論文誌-SP (Signal processing) Vol.38 No.3
In this paper, a fast motion search algorithm that performs motion search for variable blocks in integer pixel unit is proposed. The proposed method is based on the successive elimination algorithm (SEA) using sum norms to find the best estimate of motion vector and obtains the best estimate of the motion vectors of blocks, including 16${\times}$8, 8${\times}$16, and 8${\times}$8, by searching eight pixels around the best motion vector of 16${\times}$16 block obtained from all candidates. And the motion vectors of blocks, including 8${\times}$4, 4${\times}$8, and 4${\times}$4, is obtained by searching eight pixels around the best motion vector of 8${\times}$8 block. The proposed motion search is applied to the H.264 encoder that performs variable blocks motion estimation (ME). In terms of computational complexity, the proposed search algorithm for motion estimation (ME) calculates motion vectors in about 23.8 times speed compared with the spiral full search without early termination and 4.6 times speed compared with the motion estimation method using hierarchical sum of absolute difference (SAD) of 4${\times}$4 blocks, while it shows 0.1dB∼0.4dB peak signal-to-noise ratio (PSNR) drop in comparison to the spiral full search. 본 논문에서 정수단위 화소(integer pixel unit)로 움직임 예측(motion estimation)을 수행하는 빠른 움직임 예측(fast motion estimation) 알고리즘을 제안한다. 제안하는 방법은, sum norm을 사용하여 가장 좋은 움직임 벡터를 찾아내는 연속 제거 기법(SEA : Successive Elimination Algorithm)을 기반으로 16×16블록에서는 전체 영역에 대해 검색을 하고 16×8, 8×16, 8×8블록에서는 16×16블록의 움직임 벡터로부터 그 주위 8개의 위치에서 가장 좋은 벡터를 구하고, 8×4, 4×8, 4×4블록은 8×8블록의 움직임 벡터로부터 그 주위 8개의 위치에서 벡터를 검색하여 그 중에서 가장 좋은 움직임 벡터를 찾아내는 것이다. 이러한 움직임 검색(motion search) 방법을 가변 크기 블록(16×16, 16×8, 8×16, 8×8, 8×4, 4×8, 4×4)으로 움직임 예측을 하는 H.264 부호기(encoder)에 적용하였다. 제안하는 검색 알고리즘을 계산 복잡도 측면에서 보면, 조기 종료가 적용 안 된 나선형으로 전체 영역을 검색(Spiral full search without early termination)하는 방법보다 23.8배가 빨라졌고, 4×4 블록들의 계층적 SAD(Sum of Absolute Difference)를 이용하는 빠른 움직임 예측 방식보다 4.6배의 속도증가를 보인다. 반면에 신호 대 잡음 비(PSNR : Peak Signal to Noise Ratio)는 0.1dB에서 0.4dB정도 떨어짐을 보인다.
이융기,신동익,김인동,한창수,서승환,탁태열 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
In this paper, we propose the design method of linear stage for high vacuum. First of all, we selected important factor to design vacuum system, In the concrete material and components of stage are selected. And then we could choose the suitable parts after experiment. Before the experiment we cleaned each parts of linear stage. Actually, A6061 material, SUS cabIeveyor, SUS spring stopper and lubricated LM guide are good at vacuum system that need to run in high vacuum.
전이성 간암의 검출에서 나선식 CT:동맥기, 문맥기, 지연기의 상대적 가치
정융기 대한영상의학회 1995 대한영상의학회지 Vol.33 No.2
Purpose : To evaluate the relative value of arterial, portal venous and delayed phase images of spiral CT in he detection of metastatic tumor of the liver. Materials and Methods: Forty-three metastatic tumors in twelve patients were underwent tri-phasic spiral CT examination with injection of 120 ml ionic contrast material (36 g of iodine) at the rate of 3 ml/sec. Arterial, portal venous and delayed phase CT images were obtained 35, 65, and 360seconds after the start of contrast injection, respectively. Results : Arterial phase images detected 35(81%),portal venous phase images 43(100%), and delayed phase images 34(79%) lesions, respectively(p<0.05). All masses larger than 2cm(n=23) were detected in all three phases, whereas 60%, 100%, 55% of the masses smaller than2cm(n=20) were detected in arterial, portal venous and delayed phase CT, respectively. The best contrast between masses and the hepatic parenchyma was in portal venous phase followed by arterial and delayed phase(p<0.01). In two hypervascular masses, the contrast was better in arterial phase. Conclusion : Portal venous phase of spiral CT is optimal in the detection of metastatic tumor of the liver. Arterial phase may be helpful for the detection of hypervascular metastasis. Delayed phase should be used restrictively.
정상인의 지신근 근육기능에 대한 천자와 심자의 효과 비교 : 무작위 배정 임상연구
조융기,김성수,이종수,정석희,Jo, Yoong-Ki,Kim, Sung-Soo,Lee, Jong-Soo,Chung, Seok-Hee 척추신경추나의학회 2011 척추신경추나의학회지 Vol.6 No.1
Objectives : The purpose of this study is to compare the effect of superficial acupuncture to deep acupuncture on normal muscle function. Methods : In Group A, 12 healthy subjects had been treated by deep acupuncture(10mm). In Group B, 12-healthful subjects had been treated by superficial acupuncture(5mm). Each session took 10 minutes. Before and after the treatment, outcomes were assessed by Algometer for muscle tenderness, dynamometer for grasping power and Meridian-Electromyograph(MEMG) for extensor muscles. Results : The Contraction power of finger extensor muscles assessed by MEMG had decreased significantly in both groups. The muscle fatigue of finger extensor muscles assessed by MEMG had increased significantly in Deep acupuncture group. Grasping power assessed by dynamometer had no significant change in both groups. Conclusions : According to above results, superficial acupuncture is more effective on reducing muscle fatigue.
조명변화에 적응적인 움직임 검색 기법과 2차원 다이렉트 모드를 사용한 다시점 비디오 부호화
이융기(Yung Ki Lee),허재호(Jae Ho Hur),이영렬(Yung Lyul Lee) 한국방송·미디어공학회 2005 방송공학회논문지 Vol.10 No.3
A MVC (Multi-view Video Coding) method, which uses both an illumination change-adaptive ME (Motion Estimation)/MC (Motion Compensation) and a 2D (Dimensional) direct mode, is proposed. Firstly, a new SAD (Sum of Absolute Difference) measure for ME/MC is proposed to compensate the Luma pixel value changes for spatio-temporal motion vector prediction. Illumination change-adaptive (ICA) ME/MC uses the new SAD to improve both MV (Motion Vector) accuracy and bit saving. Secondly, The proposed 2D direct mode that can be used in inter-view prediction is an extended version of the temporal direct mode in MPEG-4 AVC. The proposed MVC method obtains approximately 0.8㏈ PSNR (Peak Siganl-to-Noise Ratio) increment compared with the MPEG-4 AVC simulcast coding.