结合分组相关性和注意力机制的立体匹配算法

目前立体匹配网络通常面临图像特征获取不充分、语义信息丢失和速度慢等问题。为了改善网络的特征获取能力和运行效率,提出一种结合多重注意力机制和分组相关性代价卷的立体匹配算法。首先,采用基于双重注意力机制的策略,通过融合可变形卷积构建多尺度特征提取网络。通道注意力和空间注意力机制能够在不同分辨率的图像特征提取过程中充分优化特征信息。同时,引入可变形卷积可以自适应采样物体的形状和尺寸,从而提高计算效率。接着,在代价卷的构造过程中,采用分组相关性的方法,同时结合连接特征和相似度特征生成代价卷。这不仅减少了参数和计算量,还保持了语义信息的完整性。最后,通过交叉融合不同尺度下的代价卷,得到最终的代价卷,并经过视差回归得到不同分辨率的最终视差图。实验结果表明,该算法在KITTI2015数据集上取得了显著的成果。全区域误差率仅为3.02%,计算时间为0.16 s,充分展示了该算法在保持低计算复杂度的同时获得了优越的匹配效果。

基于相关性分组的FSC赛车悬架优化方法研究

对赛车双横臂前悬架进行了多体动力仿真,分析了悬架各性能指标敏感度.用DOE试验设计法进行了优化;通过对设计变量相关性的筛选、分类,以及目标函数灵敏度的排序,进行相关性分组优化;比较了两种优化方法的效果.结果表明,分组优化方法能够克服DOE法在权重和优化目标冲突等问题上的不足,获得更好的优化解.

基于相关性分组的拉普拉斯特征评分算法

针对模式识别和机器学习中拉普拉斯评分的特征选择方法存在未考虑特征之间相关性信息这一缺陷,提出了一种新的评分算法。先利用特征之间的相关性对特征进行分组,再在组内按照其重要性进行评分,尽可能选择那些不相似的重要特征来表达数据。实验证明,该方法应用于多个数据集均具有较好的效果。

基于数据挖掘的车载信号设备智能维修方法的实现

为改变当前城市轨道交通车载信号设备维修现状,由故障后维修转换为故障前维修,依托数据挖掘的基本思想,对信号系统车载设备日常运行数据进行大数据挖掘。通过对车载日志的数据信息构建相关性分组或关联规则,形成相应的因果对应关系,并通过对列车运行状态的趋势分析和运行事件的组合比对,以实现对列车运行过程中的显性或隐性故障进行报警和提前预测,从而降低信号系统部件故障对运营造成的负面影响,这对列车故障的维修具有明显的指导意义,有助于提高列车的运行质量。

Effects of Sewage Sludge Application on the Heavy Metal Content of Crested Wheatgrass （Agropyron cristatum （L.）） Gaertn

This paper presents the data from two-year experiments concerning with doses of sewage sludge （0, 7, 14 and 21 ton.ha^-1） and inorganic nitrogen doses （0, 50, 100 and 150 kg.ha^-1） from the Municipality of Van, which is located at an altitude of 1,725 m of eastern Anatolia in Turkey. A study was conducted to assess two different N sources on sandy-silty-clay soils grown to crested wheatgrass Agropyron cristatum （L.） Gaertn, grass pasture which had been amended with sewage sludge for two years. Plant tissue and DTPA （diethylenetriamine pentaacetic acid） extractable soil nutrient were evaluated; twelve elements were analyzed in the plant tissue and six elements in the soil extract in different soil depths. The research demonstrated that the applications produced increase contents of N, P, Mg, Mn, Zn and Pb in the plant. There was a significant （P 〈 0.01） accumulation of DTPA extractable concentrations of Fe, Mn, Cu, Zn and Pb in the top soil horizon. Also, sewage sludge resulted in 51 folded increase in extractable P in 0-20 cm soil horizon. However, DTPA concentrations of in soil showed that Fe exhibited a significant positive correlation with the concentrations of exchangeable fractions of Mn, Cu, Zn and Pb with the correlation. Positive correlations were also observed between Cu-Mn, Mn-Zn, Mn-Pb, Cu-Zn, Cu-Pb and Zn-Pb concentrations. In the same way, plant uptake of the Mn, Zn and Pb was highly correlated with concentrations of Cu, Zn and Pb in the soil. It was concluded that sewage sludge is a valuable source of nutrient and also provides an opportunity to increase soil organic matter.

Expression of Hpa and CD222 in bladder carcinoma and analysis of clinico-pathologic correlation

Objective: Our study aimed to investigate the relationships between the clinico-pathologic features and the heparanase(Hpa) and CD222 expressions in bladder carcinoma. Methods: The expressions of Hpa and CD222 in 95 bladder carcinoma specimens and 20 paraneoplastic bladder tissues(controls) were assessed using the immunohistochemical staining method. Results: The positive expression rates of Hpa and CD222 in bladder carcinoma were 68.42% and 61.05%, respectively. The positive rate of Hpa was significantly higher in the carcinoma specimens than in the control specimens(P < 0.01). Similarly, the Hpa expression in the invasive bladder carcinoma was significantly higher than that in the non-invasive bladder carcinoma(P < 0.01). A positive correlation was observed between the expressions of Hpa and CD222(P < 0.05). The expressions of Hpa and CD222 were significantly correlated with lymphatic invasion and TNM staging(P < 0.05). The 5-year survival rate was significantly higher in negative expression of the Hpa group than that in the positive expression group(P < 0.05). Compared with the non-co-positive expression group, the 5-year survival rate in the co-positive expression of Hpa and CD222 group was significantly lower(P < 0.05). Conclusion: High Hpa and CD222 expressions in tumor tissues were associated with the occurrence and development of bladder carcinoma. Our results provide helpful information for the further diagnosis and therapy of bladder carcinoma.

Switching Between Antenna Subset Selection and Quasi-Orthogonal Space-Time Block Code in Presence of Correlation

We address the problem of adaptive modulation and coding scheme(AMCS) for a multi-input multioutput(MIMO) system in presence of time-varying transmitting correlation.Antenna subset selection and quasiorthogonal space-time block code(QOSTBC) have different error performances with different signal-to-noise ratios(SNRs) and in different spatial correlation scenarios.The error performance can be improved by selecting an appropriate transmission scheme to adapt to various channel conditions.The maximum distance criterion is the simplest and very effective algorithm for the antenna subset selection without needs of complex calculation and channel state information at transmitter(CSIT).The minimum error performance criteria and the simplified linear decision strategy are developed for constant transmission rate traffic to select the optimal transmission scheme.It can dramatically decrease algorithm complexity for obtaining error probability according to the known quantities comparing with using instant CSIT.Simulation results show that,remarkable performances including low SNR and weak spatial correlation at the expense of simple calculation and almost no bandwidth loss by adopting AMCS can be achieved.The proposed AMCS improves robustness of slowly varying spatial correlated channels.

A general thermodynamic analysis and treatment of phases and components in the analysis of phase assemblages in multicomponent systems

Systematic thermodynamic analysis reveals that an essential condition for the thermodynamically valid chemographic projec-tions proposed by Greenwood is completely excessive.In other words,the phases or components from which the projection is made need not be pure,nor have their chemical potentials fixed over the whole chemographic diagram.To facilitate the analy-sis of phase assemblages in multicomponent systems,all phases and components in the system are divided into internal and external ones in terms of their thermodynamic features and roles,where the external phases are those common to all assem-blages in the system,and the external components include excess components and the components whose chemical potentials(or relevant intensive properties of components) are used to define the thermodynamic conditions of the system.This general classification overcomes the difficulties and defects in the previous classifications,and is easier to use than the previous ones.According to the above classification,the phase rule is transformed into a new form.This leads to two findings:(1) the degree of freedom of the system under the given conditions is only determined by the internal components and phases;(2) different external phases can be identified conveniently according to the conditions of the system before knowing the real phase rela-tions.Based on the above results,a simple but general approach is proposed for the treatment of phases and components:all external phases and components can be eliminated from the system without affecting the phase relations,where the external components can be eliminated by appropriate chemographic projections.The projections have no restriction on the states of the phases or the chemical potentials of components from which the projections are made.The present work can give a unified ex-planation of the previous treatments of phases and components in the analysis of phase assemblages under various specific conditions.It helps to avoid potential misunderstandings or errors in the topological analysis of phase relations.