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메모리 효율 향상을 위한 조건부 GAN의 부분 영역 접근법
창윤빈(Yunbin Chang),최원용(Wonyong Choi),한기준(Keejun Han) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1
본 연구는 고해상도 이미지의 효율적인 생성을 위한 새로운 접근 방법을 제안한다. 우리는 부분 영역 기반의 조건부 생성적 적대 신경망(Conditional Generative Adversarial Networks, cGANs)을 활용하여 메모리 효율성을 크게 향상시켰다. 기존의 GAN 모델은 고해상도 이미지 생성 시 상당한 메모리를 요구하는 반면, 본 모델은 이미지를 N×N 부분 영역으로 나누고, 이를 독립적으로 처리한다. 이를 통해 각 영역의 위치 정보를 조건으로 사용하여 전체 이미지를 자연스럽게 재구성했다. 실험 결과, 제안된 모델은 기존 모델 대비 더 적은 양의 메모리를 사용하지만, 동일하거나 더 높은 품질의 이미지를 생성하는 것을 확인했다. 본 연구는 고해상도 이미지 생성 분야의 새로운 가능성을 열며, 효율적인 이미지 생성을 위한 새로운 길을 제시한다.
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Jianan Sun,Liaoyuan Zhang,Ben Rao,Yunbin Han,Ju Chu,Jiawen Zhu,Yaling Shen,Dong-Zhi Wei 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.3
Enhanced acetoin production was carried out by Serratia marcescens H32. First, medium compositions were optimized statistically for shake flask fermentations to produce acetoin. Sucrose and corn steep liquor powder (CSLP) were identified as the most significant factors by Plackett–Burman design. The path of steepest ascent and response surface methodology were then employed to determine the optimal concentrations of the two factors. Acetoin yield was up to 41.5 g/L in flask fermentations using the optimized medium. Furthermore, the optimal medium was used to conduct fermentation experiments in a 3.7-L bioreactor. The influences of different agitation speeds on acetoin production were investigated. Based on a process analysis, a two-stage agitation speed control strategy was proposed, in which the agitation speed was controlled at 700 rpm during the first 8 h and then switched to 600 rpm. A relatively high acetoin concentration (44.9 g/L)and high acetoin productivity (1.73 g/L/h) were achieved by applying this strategy. Fed-batch fermentation based on the two-stage agitation speed control strategy was performed,and a maximum acetoin concentration of 60.5 g/L with productivity of 1.44 g/L/h was achieved. Enhanced acetoin production was carried out by Serratia marcescens H32. First, medium compositions were optimized statistically for shake flask fermentations to produce acetoin. Sucrose and corn steep liquor powder (CSLP) were identified as the most significant factors by Plackett–Burman design. The path of steepest ascent and response surface methodology were then employed to determine the optimal concentrations of the two factors. Acetoin yield was up to 41.5 g/L in flask fermentations using the optimized medium. Furthermore, the optimal medium was used to conduct fermentation experiments in a 3.7-L bioreactor. The influences of different agitation speeds on acetoin production were investigated. Based on a process analysis, a two-stage agitation speed control strategy was proposed, in which the agitation speed was controlled at 700 rpm during the first 8 h and then switched to 600 rpm. A relatively high acetoin concentration (44.9 g/L)and high acetoin productivity (1.73 g/L/h) were achieved by applying this strategy. Fed-batch fermentation based on the two-stage agitation speed control strategy was performed,and a maximum acetoin concentration of 60.5 g/L with productivity of 1.44 g/L/h was achieved.
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