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오승균,박현욱,Oh, Seung-Kyun,Park, Hyun-Wook 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.6
고속으로 압축변환을 하기 위해 DCT(Discrete Cosine Transform) 영역에서 영상의 해상도를 줄이는 MPEG-2 복호기를 제안한다. 제안하는 복호기는 움직임 보상을 하기 전에 DCT 영역에서 영상의 해상도를 줄이며 해상도가 줄어든 영상에 대해서 DCT 영역에서 움직임 보상을 수행한다. 본래 해상도의 영상 (N${\times}$CN)에서는 1/2화소 정밀도의 움직임 보상을 해야 하지만 해상도가 반으로 줄어든 영상(N/2${\times}$N/2)에 대해서는 1/4화소 정밀도의 움직임 보상을 수행해야 한다. 하지만 해상도가 줄어든 영상에 대해 1/4화소 정밀도의 움직임 보상을 수행하면 영상이 흐릿해지는 현상이 발생할 수 있다. 본 논문에서는 해상도를 줄인 영상에 대해 계산시간 뿐만 아니라 DCT 영역에서의 움직임 보상 시에 발생 할 수 있는 흐려짐도 줄일 수 있는 방법을 제안한다. 실험 결과는 제안한 방법이 높은 해상도의 영상을 낮은 해상도의 영상으로 효율적으로 복호할 수 있는 알고리즘이라는 것을 보여준다.
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이산여현변환 공간에서의 영상 축소를 위한 움직임 벡터 재추정
김웅희,오승균,박현욱,Kim, Woong-Hee,Oh, Seung-Kyun,Park, Hyun-Wook 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.5
이 논문에서는 이산여현변환 공간에서 영상의 크기를 줄이는 변환부호화 과정에서의 움직임 벡터 (motion vector) 재추정을 위한 방법을 제안하였다. 제안된 방법에서는 영상 사이의 SAD (Sum of Absolute Difference)와 매크로 블록의 에지 정보를 이용하여 커널 함수를 정의하고, 그것을 이용해서 축소된 영상에서의 새로운 움직임 벡터를 재추정하였다. 변환부호화기에서는 속도의 효율성을 위해서 변환부호화기의 입력의 화면 간 (inter-frame) 정보에서 얻을 수 있는 기존의 움직임 벡터를 이용하는 방법을 택하고 있는데 본 논문에서도 속도의 효율성을 위해서 기존의 움직임 벡터들을 이용하는 방법을 선택하였다. 제안한 방법을 이용해서 실영상에 대해서 실험을 해 본 결과 연산량을 고려한 PSNR (Peak Signal to Noise Ratio)의 측면에서 우수한 성능을 보여주는 것을 확인할 수 있었다. A motion vector re-estimation algorithm for image downscaling in discrete consine transform domain is presented. Kernel functions are difined using SAD (Aum of Absolute Difference) and edge information of a macroblock. The proposed method uses these kernel functions to re-estimate a new motion vector of the downscaled image. The motion vectors from the incoming bitstream of transcoder are reused to reduce computation burden of the block-matching motion estimation, and we also reuse the given motion vectors. Several experiments in this paper show that the computation efficiency and the PSNR (Peak Signal to Noise Ratio) and better than the previous methods.
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반복마취가 SGOT, SGPT, ALP 에 미치는 영향
정성수,하인호,오승균 대한마취과학회 1986 Korean Journal of Anesthesiology Vol.19 No.1
Recently halothane and enflurane are commonly used inhalational anesthetic agents in our country. However, it is a controversial matter whether these agents are a potential threat to the liver. Therefore, in order to evaluate the effects of halothane and enflurane on the hepatic function, we divided a anesthetized patients into the following 4 groups. 1st group; low spinal anesthesia. 2nd group; single inhalational anesthesia with halothane. 3rd group; repeated secondary inhalational anesthesia with halothane. 4th group; secondary inhalational anesthesia with enflurane following halothane. On postoperative 1st, 3rd, 5th, 7th, 10th day, we checked the levels of SGOT, SGPT and ALP. The results are as follows. group 1. Low spinal anesthesia(10 cases) ;SGOT and SGPT levels-no change or recovered in 9 cases (90%) ALP level-no change in all cases. group 2. Single inhalational anesthesia with halothane (14 cases) ;SGOT and SGPT levels-no change or recovered in 13 cases(92%) severely changed in 1 case. ALP level-no change or recovered in 13 cases (92%) group 3. Repeat 2ndary halothane anesthesia following previous halothane anesthesia. (14cases) ; SGOT level-no-change or recovered in 11 cases (79%), severely changed in 2 cases. SGPT level-no-change or recovered in 11 cases (79%), severely changed in 3 cases. ALP level-no-change or recovered in 11 cases (79%), severely changed in 1 case group 4. Repeated 2ndary enflurane anesthesia following previous halothane anesthesia. (11 cases) ; SGOT level-no-change or recovered in 8 cases (72%), severely changed in 2 cases SGPT level-no-change or recovered in 8 cases (63%), severely changed in 2 cases ALP level-no-change or recovered in 5 cases (45%), severely changed in 1 case From the above results, more cases of elevated SGOT, SGPT and ALP levels and slower recovery rate were noted in the repeated anesthesia group than in the one time anesthesia group. Not only the anesthetics themselves but also other variables such as disease severity coincidental illness, transfusion, duration of operation and so on are probably responsible for these alterations.
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Dobutamine 과 Adenosine Triphosphate 또한 Sodium Nitroprusside 병합 사용시 혈역학 및 폐내 Shunt 효과의 변화
박찬진,유경연,이경엽,오승균 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.2
The purpose of this study was to evaluate the efficacy of adenosine triphosephate (ATP) in comparison to sodium nitroprusside (SNP) in reducing left ventricular afterload in 20 patients, ASA physical status I, during ethrane-N2O anesthesia. Hemodynamic effects of intravenous ATP (30~250 ug/kg/min) were compared with those of SNP (0.3~2.5 ug/kg/min) in group 1 (n=10). In group 2 (n=10), hemodynamic and intrapulmonary shunt effects of dobutamine (1 ug/kg/min) alone and in combination with ATP or SNP, required to maintain mean arterial pressure around 70 mmHg, were compared. The results were as follows. 1) Both ATP and SNP reduced arterial pressure rapidly resulting from a marked decrease in systemic vascular resistance in a dose-related manner. 2) Cardiac index increased from 3.31±0.201/min/㎡ to 4.04±0.281/min/㎡ (p$lt;0.01) following dobutamine alone, and increased further to 5.71±0.38 1/min/㎡ (p$lt;0.001) and decreased to 3.77±0.28 1/min/m (NS) in combination with ATP and SNP, respectively. 3) At equivalent d in mean arterial pressure, ATP increased heart rate significantly less than SNP. 4) Hypotensive response was more stable during ATP infusion than during SNP infusion. 5) Arterial oxygen tension was significantly higher during dobutamine/ATP infusion than during dobutamine/SNP infusion (268±6 vs 256±9 mmHg, p$lt;0.05). 6) Intrapulmonary shunt fraction increased from 4.49±0.65% to 5.51±0.71% (p$lt;0.05) following dobutamine alone, and increased further to 9.92±1.13 (p$lt;0.001) and to 7.21±0.77% (p$lt;0.01) in combination with ATP and SNP, respectively. These results suggest, although ATP increases intrapulmonary shunt fraction more than does SNP, ATP has significant advantage over SNP, either alone or in combination with dobutamine, in improving cardiac performance in patients with low output states due to high peripheral vascular resistance.
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