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Marginal bone loss around non-submerged implants is associated with salivary microbiome during bone healing 被引量:2
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作者 Xiao-Bo Duan Ting-Xi Wu +6 位作者 Yu-Chen Guo Xue-Dong Zhou Yi-Ling Lei Xin Xu An-Chun Mo Yong-Yue Wang Quan Yuan 《International Journal of Oral Science》 SCIE CAS CSCD 2017年第2期95-103,共9页
Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the sa... Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the salivary microbiome. One hundred patients were recruited, and marginal bone loss around their implants was measured using cone beam computed tomography during a 3-month healing period. The patients were divided into three groups according to the severity of marginal bone loss.Saliva samples were collected from all subjected and were analysed using 16 SMiSeq sequencing. Although the overall structure of the microbial community was not dramatically altered, the relative abundance of several taxonomic groups noticeably changed. The abundance of species in the phyla Spirochaeta and Synergistetes increased significantly as the bone loss became more severe. Species within the genus Treponema also exhibited increased abundance, whereas Veillonella, Haemophilus and Leptotrichia exhibited reduced abundances, in groups with more bone loss. Porphyromonasgingivalis, Treponemadenticola and Streptococcus intermedius were significantly more abundant in the moderate group and/or severe group. The severity of marginal bone loss around the non-submerged implant was associated with dissimilar taxonomic compositions. An increased severity of marginal bone loss was related to increased proportions of periodontal pathogenic species. These data suggest a potential role of microbes in the progression of marginal bone loss during bone healing. 展开更多
关键词 dental implant illumina sequencing marginal bone loss oral microbiome PERI-IMPLANTITIS
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基于改进PP-YOLO和Deep-SORT的多无人机实时跟踪算法 被引量:9
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作者 马峻 姚震 +1 位作者 徐翠锋 陈寿宏 《计算机应用》 CSCD 北大核心 2022年第9期2885-2892,共8页
无人机(UAV)目标尺寸较小,多架无人机之间特征也不明显,且鸟类和飞虫的干扰给无人机目标的准确检测和稳定跟踪带来了巨大挑战。针对传统目标检测算法对小目标无人机检测性能差、跟踪不稳定的问题,提出一种基于改进PP-YOLO和Deep-SORT的... 无人机(UAV)目标尺寸较小,多架无人机之间特征也不明显,且鸟类和飞虫的干扰给无人机目标的准确检测和稳定跟踪带来了巨大挑战。针对传统目标检测算法对小目标无人机检测性能差、跟踪不稳定的问题,提出一种基于改进PP-YOLO和Deep-SORT的多无人机实时跟踪算法。首先,将压缩-激励模块融入PP-YOLO检测算法中,以实现对无人机目标的特征提取和检测;其次,在ResNet50-vd结构中引入Mish激活函数,以解决反向传播过程中的梯度消失问题,并进一步提升检测精度;然后,采用Deep-SORT算法来实时跟踪无人机目标,并将提取外观特征的主干网络更换为ResNet50,从而改善原有网络对微小外观感知能力弱的状况;最后,引入损失函数Margin Loss,既提高了类别可分性,又加强了类内紧度和类间差异。实验结果表明,所提算法的检测平均精度均值(mAP)相比原始PPYOLO算法提升了2.27个百分点,跟踪准确性相对于原始Deep-SORT算法提升了4.5个百分点。所提算法的跟踪准确性可达91.6%,能够实时跟踪600 m以内多架无人机目标,有效解决了跟踪过程中的“丢帧”问题。 展开更多
关键词 无人机检测 实时跟踪 压缩-激励模块 Mish激活函数 Margin loss
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Marginalization and Loss of Pub-lic Spirit of Contemporary Chi-nese Intellectuals
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作者 Li Zhuang, China Institute of New Poems, Southwest China Normal University Chongqing Shiyuan xuebao, 2002, no. 2 《Social Sciences in China》 2003年第1期180-180,共1页
Contemporary China’S intelligentsia haslost itS concern with public issues andreduced its jnterest in sociaJ problems anditS humanistic spirit.It has thus begun to
关键词 of in marginalization and loss of Pub-lic Spirit of Contemporary Chi-nese Intellectuals that
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