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GP-GPU를 이용한 H.264/AVC 디코더의 IQ/IDCT구현
정준모(Jeong, Jun-Mo),이광엽(Lee, Kwang-Yeob) 한국전기전자학회 2010 전기전자학회논문지 Vol.14 No.2
모바일 CPU의 성능이 향상됨에 따라 전용 하드웨어의 필요성이 줄어 들고 있다. 그러나 아직까지 모바일 CPU의 성능은 한계가 있다. 이러한 제약 조건을 병렬처리와 실수 연산이 뛰어난 GP-GPU(General-Purpose computing on Graphics Processing Units)를 이용함으로써 다른 전용 하드웨어의 추가 없이 성능을 향상 시킬 수 있다. 본 논문에서는 모바일 환경에 적합하게 설계된 GP-GPU를 이용하여 H.264 디코더의 Inverse Quantization, Inverse DCT, Color Space Conversion 모듈을 구현하였다. G-PGPU를 이용한 전체 시스템 동작 시 40%의 성능 향상이 있었다. The need for dedicated hardware continue to decrease as the mobile CPU's performance increases. But, there is a limit to a mobile CPU's performance. GP-GPU(General-Purpose computing on Graphics Processing Units) can improve performance without adding other dedicated hardware. This paper presents the implementation of Inverse Quantization, Inverse DCT and Color Space Conversion module in H.264/AVC decoder using GP-GPU for a mobile environments. The proposed architecture improves approximately 40% of performance when it use all the features.
이현정 ( Hyun Jeong Lee ),정준모 ( Jun Mo Chung ),서은희 ( Eun Hee Seo ),전성우 ( Seong Woo Jeon ) 대한내과학회 2008 대한내과학회지 Vol.75 No.6
Background/Aims: Stomach cancer is the most common malignancy and one of the leading causes of cancer-related death in Korea. The early diagnosis and treatment of gastric cancer are very important because the prognosis of early gastric cancer is excellent. Gastric screening may provide an opportunity to detect asymptomatic early gastric cancer. We analyzed the characteristics of gastric cancer diagnosed with a health screening test to evaluate the usefulness of a screening program for gastric cancer. Methods: We retrospectively reviewed the clinicopathological characteristics of 111 gastric cancer patients diagnosed using gastric endoscopy as a gastric screening test at the Health Promotion Center of Kyungpook National University Hospital from July 1997 through December 2005. Results: The incidence of gastric cancer was 0.38% and the mean patient age was 58.5 years old. The proportion of early gastric cancer was 73% of all gastric cancer. In 55 cases, constituting 49.6% of all gastric cancer and 68% of early gastric cancer, the lesions were confined to the mucosa. The most common macroscopic types were type IIc in early gastric cancer and Borrmann type 3 in advanced gastric cancer. There were significant positive correlations between lymph node metastasis and both the depth of tumor invasion and size of the lesion. The 5-year survival rates are 82.7% in total gastric cancer and 97.2% in early gastric cancer. Conclusions: Gastric cancer detected during health screening has a favorable prognosis because gastric cancer confined to the mucosa predominates and early gastric cancer detected at screening has a lower incidence of metastasis to regional lymph nodes. (Korean J Med 75:665-672, 2008)