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- 저자 : Defu Hu (검색결과 2 건)
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Workpiece surface defects recognition based on improved lightweight YOLOv4
Donghua Hu,Defu Chen,Kun Yan,Yu Cao 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
A novel metal surface defect recognition scheme based on improved lightweight YOLOv4 (You Only Look Once version 4) is proposed for workpiece defects recognition in mass production. First, the image preprocessing method accurately cuts the region of interests. Second, use the lightweight network model MobileNetV2 (Mobile Networks Version2) and depthwise separable convolution replace the original backbone feature extraction network and 3 X 3 Standard convolution of YOLOv4 respectively. Therefore the model size is greatly reduced. The detection accuracy of this method for workpiece defects reaches 90.63%, and the detection speed is 33 frames per second. Compared to the original YOLOv4 model, the model size is reduced by 82.1%, the recognition accuracy is increased by 1.8%, and the processing speed increases by 150%.
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Acteoside reduces testosterone by inhibiting cAMP, p450scc, and StAR in rat Leydig cells
Shuqiang Liu,Junwen Zhang,Weixuan Li,Tianxiang Zhang,Defu Hu 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.1
The present study investigated the in vivo and in vitro effects of acteoside on testosterone production in Sprague-Dawley (SD) rats. The in vivo experiment revealed that acteoside reduced the testosterone level in serum significantly (P⁄0.05). The in vitro experiment also illustrated that acteoside significantly reduced testosterone production in SD rat Leydig cells in primary culture (P⁄0.05). Enzyme-linked immunosorbent assay results demonstrated that acteoside significantly reduced the cyclic adenosine 3′, 5′-monophosphate (cAMP) level (P⁄0.05), and Western blot analysis showed that acteoside significantly reduced cholesterol side-chain cleavage enzyme (p450scc) and steroidogenic acute regulatory (StAR) expression (P⁄ 0.05). Hoechst 33342 staining and Western blotting showed that acteoside did not induce apoptosis in Leydig cells. Together, these results suggest that the acteoside-induced reduction in testosterone production in rat may be at least partially due to down-regulation of cAMP, p450scc, and StAR, but not apoptosis.
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