多视图聚类(Multi-View Clustering,MVC)旨在利用不同视图间的一致性和互补性来高效处理多视图数据,是大数据分析中重要的研究方向之一.然而,现有方法无法有效学习到多视图信息间的潜在联系,且缺乏考虑视图重要性差异问题.针对上述这些...多视图聚类(Multi-View Clustering,MVC)旨在利用不同视图间的一致性和互补性来高效处理多视图数据,是大数据分析中重要的研究方向之一.然而,现有方法无法有效学习到多视图信息间的潜在联系,且缺乏考虑视图重要性差异问题.针对上述这些问题,本文提出了一种基于分布对齐变分自编码器的深度多视图聚类方法(Deep Multi-View Clustering based on Distribution Aligned Variational Autoencoder,DMVCDA).首先,针对特定视图我们利用多个变分自编码器从不同视图中提取潜在特征,并对特征的分布进行对齐,以挖掘包含基本信息的潜在特征;然后,引入视图权重参数,获取共享的潜在特征;最后,在潜在特征上建立面向聚类的损失目标,使得学习到的潜在特征更适合聚类任务,从而提高聚类精度.在五个公共多视图数据集上的实验结果表明,我们的模型在精确度(ACC)、标准互信息(NMI)和纯度(Purity)等多个聚类评价指标上均表现出优异的性能.展开更多
Development of minimally invasive dry electrodes for recording biopotentials is presented. The detailed fabrication process is outlined. A dry electrode is formed by a number of microneedles. The lengths of the micron...Development of minimally invasive dry electrodes for recording biopotentials is presented. The detailed fabrication process is outlined. A dry electrode is formed by a number of microneedles. The lengths of the microneedles are about 150μm and the diameters are about 50μm. The tips of the microneedles are sharp enough to penetrate into the skin. The silver/silver chloride is grown on microneedle arrays and demonstrates good character. The electrocardiogram shows that the dry electrode is suitable for recording biopotentials.展开更多
Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the en...Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the enhancement mechanism are investigated.From theoretical analysis,it is found that the characteristics of LED light emission are modulated by the photonic crystal slab.Experimental results show that the LED light emission intensity is enhanced by 38%due to guide mode extracting by the photonic crystal.展开更多
[目的]结直肠癌发病性别差异较大,但原因不明,该研究拟评价男性结直肠癌发病超额风险中已知危险因素的解释比例。[方法]针对我国4个省参加结直肠癌筛查项目的参与者,开展结直肠癌危险因素分析。采用Logistic回归和超额风险解释度分析(ex...[目的]结直肠癌发病性别差异较大,但原因不明,该研究拟评价男性结直肠癌发病超额风险中已知危险因素的解释比例。[方法]针对我国4个省参加结直肠癌筛查项目的参与者,开展结直肠癌危险因素分析。采用Logistic回归和超额风险解释度分析(explained share of excess risk,ERR)评价男性超额风险的危险因素解释比例。[结果]男性结直肠癌发病风险是女性的1.8倍(OR=1.80,95%CI:1.62~1.99,P<0.01);该部分超额风险可以被烟草暴露、酒精摄入、蔬菜摄入、水果摄入、畜肉摄入、粗粮摄入、体育锻炼、家族史等因素解释31.3%。[结论]男性结直肠癌超额发病风险仅有部分可被已知危险因素解释,进一步探索包括遗传易感性等在内更多的结直肠癌危险因素,对于结直肠癌一、二级预防意义重大。展开更多
文摘多视图聚类(Multi-View Clustering,MVC)旨在利用不同视图间的一致性和互补性来高效处理多视图数据,是大数据分析中重要的研究方向之一.然而,现有方法无法有效学习到多视图信息间的潜在联系,且缺乏考虑视图重要性差异问题.针对上述这些问题,本文提出了一种基于分布对齐变分自编码器的深度多视图聚类方法(Deep Multi-View Clustering based on Distribution Aligned Variational Autoencoder,DMVCDA).首先,针对特定视图我们利用多个变分自编码器从不同视图中提取潜在特征,并对特征的分布进行对齐,以挖掘包含基本信息的潜在特征;然后,引入视图权重参数,获取共享的潜在特征;最后,在潜在特征上建立面向聚类的损失目标,使得学习到的潜在特征更适合聚类任务,从而提高聚类精度.在五个公共多视图数据集上的实验结果表明,我们的模型在精确度(ACC)、标准互信息(NMI)和纯度(Purity)等多个聚类评价指标上均表现出优异的性能.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60776024, 60877035 and 90820002, tile National High-Technology Research and Development Program of China under Grant Nos 2007AA03Z427, 2007AA04Z329 and 2007AA04Z254.
文摘Development of minimally invasive dry electrodes for recording biopotentials is presented. The detailed fabrication process is outlined. A dry electrode is formed by a number of microneedles. The lengths of the microneedles are about 150μm and the diameters are about 50μm. The tips of the microneedles are sharp enough to penetrate into the skin. The silver/silver chloride is grown on microneedle arrays and demonstrates good character. The electrocardiogram shows that the dry electrode is suitable for recording biopotentials.
基金Supported by the National High Technology Research and Development Program of China under Grant Nos 2008AA03Z402 and 2009AA03Z412the National Natural Science Foundation of China under Grant Nos 60807010,60736037 and 60978067the National Basic Research Program of China under Grant Nos 2009CB320300 and 2010CB934104.
文摘Light extraction effects ora photonic crystal slab with a micrometer scale lattice constant are studied.A GaN light emitting diode(LED)with a photonic crystal slab is fabricated.The light extraction effects and the enhancement mechanism are investigated.From theoretical analysis,it is found that the characteristics of LED light emission are modulated by the photonic crystal slab.Experimental results show that the LED light emission intensity is enhanced by 38%due to guide mode extracting by the photonic crystal.
文摘[目的]结直肠癌发病性别差异较大,但原因不明,该研究拟评价男性结直肠癌发病超额风险中已知危险因素的解释比例。[方法]针对我国4个省参加结直肠癌筛查项目的参与者,开展结直肠癌危险因素分析。采用Logistic回归和超额风险解释度分析(explained share of excess risk,ERR)评价男性超额风险的危险因素解释比例。[结果]男性结直肠癌发病风险是女性的1.8倍(OR=1.80,95%CI:1.62~1.99,P<0.01);该部分超额风险可以被烟草暴露、酒精摄入、蔬菜摄入、水果摄入、畜肉摄入、粗粮摄入、体育锻炼、家族史等因素解释31.3%。[结论]男性结直肠癌超额发病风险仅有部分可被已知危险因素解释,进一步探索包括遗传易感性等在内更多的结直肠癌危险因素,对于结直肠癌一、二级预防意义重大。
