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고성능 HEVC 부호기를 위한 변환양자화기 하드웨어 설계
박승용,조흥선,류광기,Park, Seungyong,Jo, Heungseon,Ryoo, Kwangki 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.2
본 논문에서는 고성능 HEVC(High Efficiency Video Coding) 부호기를 위한 변환양자화기 하드웨어 구조를 제안한다. HEVC 변환기는 율-왜곡 비용을 비교하여 최적의 변환모드를 결정하지만 율-왜곡 비용은 변환과, 양자화, 역양자화 그리고 역변환을 통해 계산된 왜곡 값과 비트 량으로 결정된다. 따라서 상당히 많은 연산량과 소요시간이 필요하기 때문에 고해상도/고화질의 영상을 실시간으로 처리하는데 어려움이 따른다. 본 논문에서는 변환을 통한 계수의 합계를 비교하여 변환모드를 결정하는 방법을 제안한다. 성능 평가 지표는 BD-PSNR과 BD-Bitrate를 사용하였으며, 실험 결과를 토대로 영상의 화질에서 큰 변화 없이 신속하게 모드를 결정할 수 있음을 확인하였다. 제안하는 하드웨어 구조는 변환모드에 따라 다른 값을 동일한 출력에 할당하고 곱셈 계수가 최대한 중복되도록 구성하여 하드웨어 면적을 감소시키고 연속적인 파이프라인 동작으로 구현함으로써 성능을 높였으며, 기존의 제안된 논문에서 사용한 공정 대비 더 큰 공정을 사용한 것을 감안하여 면적은 1/2배 감소, 성능은 2.3배 증가하였다. In this paper, we propose a hardware architecture of transform and quantization for high-perfornamce HEVC(High Efficiency VIdeo Coding) encoder. HEVC transform decides the transform mode by comparing RDCost to search for the best mode of them. But, RDCost is computed using the bit-rate and distortion which is computed by transform, quantization, de-quantization, and inverse transform. Due to the many calculations and encoding time, it is hard to process high resolution and high definition image in real-time. This paper proposes the method of transform mode decision by comparing sum of coefficient after transform only. We use BD-PSNR and BD-Bitrate which is performance indicator. Based on the experimental result, We confirmed that the decision of transform mode can process images with no significant change in the image quality. We reduced hardware area by assigning different values at the same output according to the transform mode and overlapping coefficient multiplied as much as possible. Also, we raise performance by implementing sequential pipeline operation. In view of the larger process that we used compared with the process of reference paper, Our design has reduced by half the hardware area and has increased performance 2.3 times.
A case Report : Successful MARS therapy for acute liver failure in pregnancy
박승용,서윤성,정재석,최영훈,김소리,박성주,이용철,이흥범 대한결핵 및 호흡기학회 2018 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.126 No.-
Acute liver failure (ALF) in pregnancy is a rare life-threatening condition most frequently appearing in the third trimester of pregnancy or the early postpartum period. ALF specific to pregnancy including pre-eclampsia, associated with hemolysis, elevated liver enzymes and low platelet count (HELLP) syndrome, acute fatty liver of pregnancy, and hepatic infarction result in increased maternal and fetal mortality if not recognized and acted on early. Treatment of acute fatty liver of pregnancy is a combination of maternal stabilization and prompt delivery of the fetus, regardless of gestational age. In severe cases, mostly when diagnosis has been delayed, there may be many more days of illness requiring maximal supportive management in an intensive care unit, including mechanical ventilation because of coma, dialysis for acute renal failure, parenteral nutrition because of associated pancreatitis, or even surgery to treat bleeding from a preceding cesarean section. The molecular adsorbents recirculating system (MARS) is the best known blood detoxification system based on albumin dialysis indicated for patients with acute liver failure and acute on chronic liver failure. MARS is usually used for the treatment of drug overdoses, poisoning and hepatic encephalopathy and has also been studied in acute liver failure. Herein, we report an interesting case of 28-year-old female patient(Pregnancy 36wks + 1) that pregnancy induced acute liver failure, DIC, and AKI was improved by best supportive care after MARS.