为提高噪音人脸图像分类问题中的抗噪性能,在综合最小类内方差支持向量机(minimum class variance support vector machines,MCVSVMs)和总间隔v-支持向量机(total margin v support vector machine,TM-v-SVM)的优点的基础上,提出了基于...为提高噪音人脸图像分类问题中的抗噪性能,在综合最小类内方差支持向量机(minimum class variance support vector machines,MCVSVMs)和总间隔v-支持向量机(total margin v support vector machine,TM-v-SVM)的优点的基础上,提出了基于公共矢量的总间隔v最小类内方差支持向量机(Total margin v minimum class variance support vector machines based on common vectors,TM-v-M(CV)2SVMs)。受公共矢量(commonvectors,CVs)的启发,引入了散度矩阵以进一步提高算法的分类性能和抗噪性能,并给出了TM-v-M(CV)2SVMs的推导过程。经实验证明,在噪音人脸图像的分类问题中,TM-v-M(CV)2SVMs获得了比MCVSVMs和TM-v-SVM更好的分类性能和抗噪性能。展开更多
Background Studies have shown that staged percutaneous coronary intervention （PCI） for non-culprit lesions is beneficial for prog- nosis of ST-segment elevation myocardial infarction （STEMI） patients with multives...Background Studies have shown that staged percutaneous coronary intervention （PCI） for non-culprit lesions is beneficial for prog- nosis of ST-segment elevation myocardial infarction （STEMI） patients with multivessel disease. However, the optimal timing of staged re- vascularization is still controversial. This study aimed to find the optimal timing of staged revascularization. Methods A total of 428 STEMI patients with multivessel disease who underwent primary PCI and staged PCI were included. According to the time interval between primary and staged PCI, patients were divided into three groups （〈 1 week, 1- weeks, and 2-12 weeks after primary PCI）. The primary endpoint was major adverse cardiovascular events （MACE）, a composite of all-cause death, non-fatal re-infarction, repeat revascularization, and stroke. Cox regression model was used to assess the association between staged PCI timing and risk of MACE. Results During the follow-up, 119 participants had MACEs. There was statistical difference in MACE incidence among the three groups （〈 1 week： 23.0%; 1-2 weeks： 33.0%; 2-12 weeks： 40.0%; P = 0.001）. In the multivariable adjustment model, the timing interval of staged PCI ≤ 1 week and l-2 weeks were both significantly associated with a lower risk of MACE [hazard ratio （HR）： 0.40, 95% confidence intervals （CI）： 0.24-4）.65; HR： 0.54, 95% CI： 0.3 lq3.93, respectively], mainly attributed to a lower risk of repeat revascularization （HR： 0.41, 95% CI： 0.24-0.70; HR： 0.36, 95% CI： 0.18-0.7）, compared with a strategy of 2-12 weeks later of primary PCI. Conclusions The optimal timing of staged PCI for non-culprit vessels should be within two weeks after primary PCI for STEMI patients.展开更多
文摘为提高噪音人脸图像分类问题中的抗噪性能,在综合最小类内方差支持向量机(minimum class variance support vector machines,MCVSVMs)和总间隔v-支持向量机(total margin v support vector machine,TM-v-SVM)的优点的基础上,提出了基于公共矢量的总间隔v最小类内方差支持向量机(Total margin v minimum class variance support vector machines based on common vectors,TM-v-M(CV)2SVMs)。受公共矢量(commonvectors,CVs)的启发,引入了散度矩阵以进一步提高算法的分类性能和抗噪性能,并给出了TM-v-M(CV)2SVMs的推导过程。经实验证明,在噪音人脸图像的分类问题中,TM-v-M(CV)2SVMs获得了比MCVSVMs和TM-v-SVM更好的分类性能和抗噪性能。
文摘Background Studies have shown that staged percutaneous coronary intervention （PCI） for non-culprit lesions is beneficial for prog- nosis of ST-segment elevation myocardial infarction （STEMI） patients with multivessel disease. However, the optimal timing of staged re- vascularization is still controversial. This study aimed to find the optimal timing of staged revascularization. Methods A total of 428 STEMI patients with multivessel disease who underwent primary PCI and staged PCI were included. According to the time interval between primary and staged PCI, patients were divided into three groups （〈 1 week, 1- weeks, and 2-12 weeks after primary PCI）. The primary endpoint was major adverse cardiovascular events （MACE）, a composite of all-cause death, non-fatal re-infarction, repeat revascularization, and stroke. Cox regression model was used to assess the association between staged PCI timing and risk of MACE. Results During the follow-up, 119 participants had MACEs. There was statistical difference in MACE incidence among the three groups （〈 1 week： 23.0%; 1-2 weeks： 33.0%; 2-12 weeks： 40.0%; P = 0.001）. In the multivariable adjustment model, the timing interval of staged PCI ≤ 1 week and l-2 weeks were both significantly associated with a lower risk of MACE [hazard ratio （HR）： 0.40, 95% confidence intervals （CI）： 0.24-4）.65; HR： 0.54, 95% CI： 0.3 lq3.93, respectively], mainly attributed to a lower risk of repeat revascularization （HR： 0.41, 95% CI： 0.24-0.70; HR： 0.36, 95% CI： 0.18-0.7）, compared with a strategy of 2-12 weeks later of primary PCI. Conclusions The optimal timing of staged PCI for non-culprit vessels should be within two weeks after primary PCI for STEMI patients.
