针对单目3D目标检测在视角变化引起的物体大小变化以及物体遮挡等情况下效果不佳的问题,提出一种融合深度信息和实例分割掩码的新型单目3D目标检测方法。首先,通过深度-掩码注意力融合(DMAF)模块,将深度信息与实例分割掩码结合,以提供...针对单目3D目标检测在视角变化引起的物体大小变化以及物体遮挡等情况下效果不佳的问题,提出一种融合深度信息和实例分割掩码的新型单目3D目标检测方法。首先,通过深度-掩码注意力融合(DMAF)模块,将深度信息与实例分割掩码结合,以提供更准确的物体边界;其次,引入动态卷积,并利用DMAF模块得到的融合特征引导动态卷积核的生成,以处理不同尺度的物体;再次,在损失函数中引入2D-3D边界框一致性损失函数,调整预测的3D边界框与对应的2D检测框高度一致,以提高实例分割和3D目标检测任务的效果;最后,通过消融实验验证该方法的有效性,并在KITTI测试集上对该方法进行验证。实验结果表明,与仅使用深度估计图和实例分割掩码的方法相比,在中等难度下对车辆类别检测的平均精度提高了6.36个百分点,且3D目标检测和鸟瞰图目标检测任务的效果均优于D4LCN(Depth-guided Dynamic-Depthwise-Dilated Local Convolutional Network)、M3D-RPN(Monocular 3D Region Proposal Network)等对比方法。展开更多
目的:使用Meta分析的方法比较单纯抗凝治疗与血管内治疗颅内静脉窦血栓形成(CVST)的安全性与有效性。方法:检索PubMed、Embase、知网、维普、万方数据库,检索时限从2000年1月1日开始至2023年12月31日。应用RevManV 5.4软件对纳入的文献...目的:使用Meta分析的方法比较单纯抗凝治疗与血管内治疗颅内静脉窦血栓形成(CVST)的安全性与有效性。方法:检索PubMed、Embase、知网、维普、万方数据库,检索时限从2000年1月1日开始至2023年12月31日。应用RevManV 5.4软件对纳入的文献进行Meta分析。结果:共有7篇符合要求的文献纳入分析,总计CVST患者489人,其中血管内治疗组240人,单纯抗凝治疗组249人。Meta分析结果显示,血管内治疗组治疗后mRS评分低于单纯抗凝治疗(MD = −0.38, 95% CI: −0.46~−0.30, P 2 = 60%, P = 0.02)。治疗后血管再通率血管内治疗组优于单纯抗凝治疗组(OR = 6.55, 95% CI: 2.70~15.90, P Objective: To compare the safety and efficacy of intravascular treatment versus anticoagulation alone for cerebral venous sinus thrombosis (CVST) using a Meta-analysis approach. Methods: Digital libraries, including PubMed, Embase, CNKI, Wanfang, and VIP, were searched for relevant studies published from January 1, 2000, to December 31, 2023. The included studies were assessed using RevManV 5.4 software for data extraction and quality evaluation. Results: A total of seven eligible studies involving 489 CVST patients (240 in the intravascular treatment group and 249 in the anticoagulation group) were included in the analysis. The Meta-analysis results showed that post-treatment modified Rankin Scale (mRS) scores were significantly lower in the intravascular treatment group compared to the anticoagulation group (MD = −0.38, 95% CI: −0.46~−0.30, P 2 = 60%, P = 0.02). The rate of vascular re-establishment after treatment was significantly higher in the intravascular treatment group (OR = 6.55, 95% CI: 2.70~15.90, P < 0.05). However, there were no statistically significant differences between the groups in terms of post-treatment mortality (OR = 0.86, 95% CI: 0.25~2.96, P = 0.81) or the incidence of bleeding events (OR = 0.34, 95% CI: 0.10~1.16, P = 0.09). Conclusions: Compared to anticoagulation alone, intravascular treatment improves clinical symptoms and increases the rate of vascular re-establishment in CVST patients without affecting the incidence of bleeding events or mortality rates. These findings highlight the potential benefits of intravascular treatment in enhancing patient outcomes while maintaining safety.展开更多
为解决采用涡轮增压器后带来的振动与噪声问题,对急加速过程产生的增压器异响嗒嗒声进行了原理分析,采用LMS Test Lab软件在整车上进行了测试。根据测试结果,利用排除法进行了诊断,确定产生嗒嗒声的部位和根源为执行器;按照管道内消除...为解决采用涡轮增压器后带来的振动与噪声问题,对急加速过程产生的增压器异响嗒嗒声进行了原理分析,采用LMS Test Lab软件在整车上进行了测试。根据测试结果,利用排除法进行了诊断,确定产生嗒嗒声的部位和根源为执行器;按照管道内消除气体振动原理,在执行器入口处增加了一个稳压腔,同时结合仿真结果,调整了执行器内部的弹簧刚度,经过主观评价和试验测试,嗒嗒声已彻底消除。研究结果表明:急加速时的增压器嗒嗒声是由于执行器入口及发动机排气压力脉动造成的,降低嗒嗒声的最主要方法是减小执行器入口压力脉动。展开更多
文摘针对单目3D目标检测在视角变化引起的物体大小变化以及物体遮挡等情况下效果不佳的问题,提出一种融合深度信息和实例分割掩码的新型单目3D目标检测方法。首先,通过深度-掩码注意力融合(DMAF)模块,将深度信息与实例分割掩码结合,以提供更准确的物体边界;其次,引入动态卷积,并利用DMAF模块得到的融合特征引导动态卷积核的生成,以处理不同尺度的物体;再次,在损失函数中引入2D-3D边界框一致性损失函数,调整预测的3D边界框与对应的2D检测框高度一致,以提高实例分割和3D目标检测任务的效果;最后,通过消融实验验证该方法的有效性,并在KITTI测试集上对该方法进行验证。实验结果表明,与仅使用深度估计图和实例分割掩码的方法相比,在中等难度下对车辆类别检测的平均精度提高了6.36个百分点,且3D目标检测和鸟瞰图目标检测任务的效果均优于D4LCN(Depth-guided Dynamic-Depthwise-Dilated Local Convolutional Network)、M3D-RPN(Monocular 3D Region Proposal Network)等对比方法。
文摘目的:使用Meta分析的方法比较单纯抗凝治疗与血管内治疗颅内静脉窦血栓形成(CVST)的安全性与有效性。方法:检索PubMed、Embase、知网、维普、万方数据库,检索时限从2000年1月1日开始至2023年12月31日。应用RevManV 5.4软件对纳入的文献进行Meta分析。结果:共有7篇符合要求的文献纳入分析,总计CVST患者489人,其中血管内治疗组240人,单纯抗凝治疗组249人。Meta分析结果显示,血管内治疗组治疗后mRS评分低于单纯抗凝治疗(MD = −0.38, 95% CI: −0.46~−0.30, P 2 = 60%, P = 0.02)。治疗后血管再通率血管内治疗组优于单纯抗凝治疗组(OR = 6.55, 95% CI: 2.70~15.90, P Objective: To compare the safety and efficacy of intravascular treatment versus anticoagulation alone for cerebral venous sinus thrombosis (CVST) using a Meta-analysis approach. Methods: Digital libraries, including PubMed, Embase, CNKI, Wanfang, and VIP, were searched for relevant studies published from January 1, 2000, to December 31, 2023. The included studies were assessed using RevManV 5.4 software for data extraction and quality evaluation. Results: A total of seven eligible studies involving 489 CVST patients (240 in the intravascular treatment group and 249 in the anticoagulation group) were included in the analysis. The Meta-analysis results showed that post-treatment modified Rankin Scale (mRS) scores were significantly lower in the intravascular treatment group compared to the anticoagulation group (MD = −0.38, 95% CI: −0.46~−0.30, P 2 = 60%, P = 0.02). The rate of vascular re-establishment after treatment was significantly higher in the intravascular treatment group (OR = 6.55, 95% CI: 2.70~15.90, P < 0.05). However, there were no statistically significant differences between the groups in terms of post-treatment mortality (OR = 0.86, 95% CI: 0.25~2.96, P = 0.81) or the incidence of bleeding events (OR = 0.34, 95% CI: 0.10~1.16, P = 0.09). Conclusions: Compared to anticoagulation alone, intravascular treatment improves clinical symptoms and increases the rate of vascular re-establishment in CVST patients without affecting the incidence of bleeding events or mortality rates. These findings highlight the potential benefits of intravascular treatment in enhancing patient outcomes while maintaining safety.
文摘为解决采用涡轮增压器后带来的振动与噪声问题,对急加速过程产生的增压器异响嗒嗒声进行了原理分析,采用LMS Test Lab软件在整车上进行了测试。根据测试结果,利用排除法进行了诊断,确定产生嗒嗒声的部位和根源为执行器;按照管道内消除气体振动原理,在执行器入口处增加了一个稳压腔,同时结合仿真结果,调整了执行器内部的弹簧刚度,经过主观评价和试验测试,嗒嗒声已彻底消除。研究结果表明:急加速时的增压器嗒嗒声是由于执行器入口及发动机排气压力脉动造成的,降低嗒嗒声的最主要方法是减小执行器入口压力脉动。
