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OpenCL을 이용한 돈사 감시 응용의 효율적인 태스크 분배
김진성,최윤창,김재학,정연우,정용화,박대희,김학재,Kim, Jinseong,Choi, Younchang,Kim, Jaehak,Chung, Yeonwoo,Chung, Yongwha,Park, Daihee,Kim, Hakjae 한국정보처리학회 2017 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.6 No.10
Pig monitoring applications consisting of many tasks can take advantage of inherent data parallelism and enable parallel processing using performance accelerators. In this paper, we propose a task distribution method for pig monitoring applications into a heterogenous computing platform consisting of a multicore-CPU and a manycore-GPU. That is, a parallel program written in OpenCL is developed, and then the most suitable processor is determined based on the measured execution time of each task. The proposed method is simple but very effective, and can be applied to parallelize other applications consisting of many tasks on a heterogeneous computing platform consisting of a CPU and a GPU. Experimental results show that the performance of the proposed task distribution method on three different heterogeneous computing platforms can improve the performance of the typical GPU-only method where every tasks are executed on a deviceGPU by a factor of 1.5, 8.7 and 2.7, respectively. 다수의 태스크로 구성된 돈사 감시 응용은 내재된 데이터 병렬성을 활용하고 성능가속기를 사용하여 병렬 처리가 가능하다. 본 논문에서는 멀티코어 CPU와 매니코어 GPU로 구성된 이기종 컴퓨팅 플랫폼에서 돈사 감시 응용 수행 시 태스크 분배 방법을 제안한다. 즉, 각 태스크별로 OpenCL을 이용한 병렬 프로그램을 작성한 뒤, deviceCPU와 deviceGPU 각각에서 수행시켜 측정된 수행시간을 기준으로 가장 적합한 처리기를 결정한다. 제안 방법은 간단하지만 매우 효과적이고, CPU와 GPU로 구성된 이기종 컴퓨팅 플랫폼에서 다수의 태스크로 구성된 다른 응용을 병렬화하는 경우에도 적용될 수 있다. 실험 결과, 상이한 이기종 컴퓨팅 플랫폼에서 최적의 태스크 분배로 수행한 경우 가 전체 태스크들을 deviceGPU에서 수행한 GPU-only 방법에 비교하여 각각 2.7배, 8.7배, 2.7배 성능 개선이 되었음을 확인하였다.
사회불안장애에서 편도 하위영역의 내재 기능적 연결성의 특성
김진성,윤형준,박선영,신유빈,김재진,Kim, Jinseong,Yoon, Hyung-Jun,Park, Sunyoung,Shin, Yu-Bin,Kim, Jae-Jin 대한불안의학회 2014 대한불안의학회지 Vol.10 No.1
Objective : The amygdala has been considered to be a critical region in the pathophysiology of social anxiety disorder, but subregional connectivity pattern has not been examined yet despite lots of previous functional neuroimaging studies. Methods : Resting-state functional magnetic resonance imaging data was obtained in 19 patients with social anxiety disorder and 20 normal controls, and default mode functional connectivity with each of basolateral, centromedial and superficial areas of the amygdala was measured and compared between the two groups. Results : Differential amygdala-based networks between the two groups were distributed to all over the brain. In particular, however, a bias on the amygdala-cingulate pathway was observed in the superficial amygdala only. Connectivity strengths between the superficial amygdala and perigenual anterior cingulate cortex were correlated with scores of social interaction and avoidance. Conclusion : Our findings provide new insights into understanding of the intrinsic cognitive bias model of social anxiety disorder. An abnormality in superficial amygdala-anterior cingulate connectivity may influence on cognitive processing of socially-relevant information in social anxiety disorder.
암모니아/메탄 예혼합 대향류 화염의 상호작용에 관한 수치해석적 연구
김진성(Jinseong Kim),조서희(Seohee Cho),이기만(Keeman Lee) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Ammonia is one of the fuels that has recently been especially notable as a carbon-free fuel, and in order to use ammonia as a major fuel, study on the basic combustion characteristics of ammonia needs to be proceeded. In this study, the OPPDIF code of ANSYS Chemkin Pro was used to simulate methane/ammonia premixed flames produced based on stagnation point in counterflow flow fields. The Lewis number is defined as the ratio of thermal diffusivity to mass diffusivity, and affects the flame extinction behavior. It was investigated by the major variables global strain rate and mole fraction of ammonia.