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대규모 병렬 시스템에서 캐시와 공유메모리를 이용한 유한 차분법 성능
김현규,이효종,Kim, Hyun Kyu,Lee, Hyo Jong 대한전자공학회 2013 전자공학회논문지 Vol.50 No.6
최근 GPU 시스템과 같은 수백 개의 프로세서로 구성된 대규모 병렬 시스템을 이용하여 성능을 향상시키는 방법들이 많이 개발 되었다. 대표적으로 GPU에서 캐싱(Caching)과 유사한 개념으로 공유 메모리가 사용되었다. 출력 값을 얻기 위해서 이웃 값을 참조하는 이미지 필터와 같은 알고리즘들의 경우 이웃 값의 참조가 빈번하게 발생되므로 공유 메모리를 사용할 경우 성능이 향상되었다. 그러나 공유 메모리를 사용하기 위해서는 기존 코드를 재 구현해야만 하고 이는 코드의 복잡도를 증가시키는 원인이 된다. 최근 GPU 시스템에서는 공유 메모리 뿐 아니라 L1과 L2 캐시 메모리를 지원하도록 하였다. L1 캐시 메모리는 공유 메모리와 동일한 하드웨어에 위치하여 캐시의 사용이 성능향상을 도와줄 것으로 예측된다. 따라서 본 논문에서는 캐시 메모리와 공유 메모리의 성능을 비교하였다. 연구결과 성능 면에서 캐시 메모리를 사용한 알고리즘과 공유메모리를 사용한 알고리즘은 유사하였다. 특히 캐시 메모리를 사용하는 경우 공유메모리 사용 프로그래밍에서 나타나는 코드 복잡도의 증가 문제도 동시에 해결할 수 있었다. Many algorithms have been introduced to improve performance by using massively parallel systems, which consist of several hundreds of processors. A typical example is a GPU system of many processors which uses shared memory. In the case of image filtering algorithms, which make references to neighboring points, the shared memory helps improve performance by frequently accessing adjacent pixels. However, using shared memory requires rewriting the existing codes and consequently results in complexity of the codes. Recent GPU systems support both L1 and L2 cache along with shared memory. Since the L1 cache memory is located in the same area as the shared memory, the improvement of performance is predictable by using the cache memory. In this paper, the performance of cache and shared memory were compared. In conclusion, the performance of cache-based algorithm is very similar to the one of shared memory. The complexity of the code appearing in a shared memory system, however, is resolved with the cache-based algorithm.
국소 타크로리무스로 치료한 소아기 육아종성 입주위 피부염
김현규 ( Hyun Kyu Kim ),김동하 ( Dong Ha Kim ),박귀영 ( Kui Young Park ),이갑석 ( Kap Sok Li ),서성준 ( Seong Jun Seo ),홍창권 ( Chang Kwun Hong ) 대한피부과학회 2011 大韓皮膚科學會誌 Vol.49 No.9
Childhood granulomatous periorificial dermatitis (CGPD) is a benign facial eruption of unknown etiology characterized by a monomorphic papular eruption occurring in the perinasal, perioral, and periocular areas. We report an 11-year-old boy with characteristic features of CGPD. He presented with a 4-month history of non-pruritic, papular eruptions on the face. The histopathologic exam revealed an upper dermal granuloma with surrounding lymphocytes. Treatment was initiated with tetracycline 500 mg/day, but there was no response for 3 weeks. We tried 0.03% topical tacrolimus to treat recalcitrant skin lesions. After 10 weeks of treatment, the lesions resolved without scarring. (Korean J Dermatol 2011;49(9):837~839)
재활운동프로그램이 만성 뇌졸중 환자의 신체 기능변화에 미치는 영향
김현규 ( Hyun Kyu Kim ),김중휘(교신저자) ( Joong Hwi Kim ),신효성 ( Hyo Soung Shin ) 대한신경치료학회 2011 신경치료 Vol.15 No.1
Purpose The objective of this study was to evaluate the effect of the change in body function for chronic stroke patients after Rehabilitation exercise Training. Method The chronic stroke patient was participated in this study and patient``s past onset time had been passed over three month. To compare the body balance and Functional ability before and after the treatment, BBS(Berg Balance Scale) and FMAS(Functional Movement Assessment Scale) was used. Result The results as following: The Functional Activity Scale was increased from 19 to 24. The Berg Balance Scale was increased from 6 to 10. The improvements of both Functional activity and Balance ability. Conclusion The result showed that Rehabilitation exercise Training in this study was improved for the ability of functional activity and balance in chronic stroke patient. It suggest Rehabilitation exercise Training may be an effective way for improving Body function
김현규 ( Hyun Kyu Kim ),여인권 ( In Kwon Yeo ),김동하 ( Dong Ha Kim ),박귀영 ( Kui Young Park ),이갑석 ( Kap Sok Li ),서성준 ( Seong Jun Seo ),홍창권 ( Chang Kwun Hong ),송계용 ( Kye Yong Song ) 대한피부과학회 2012 大韓皮膚科學會誌 Vol.50 No.2
Necrobiotic xanthogranuloma (NXG) is a rare, progressive, histiocytic disease characterized by destructive cutaneous lesions, a close association with paraproteinemia, multiple myeloma, hypertension, and multiple extracutaneous manifestations. Multiple indurated yellow-red plaques or nodules are commonly present in this disorder. The pathogenesis of NXG is poorly understood. Histopathologically, NXG features with hyaline necrosis or necrobiosis are present. We describe a patient with typical cutaneous and histologic findings of NXG with an associated monoclonal gammopathy. (Korean J Dermatol 2012;50(2):152~155)