Nonwovens are fiber materials which are based on nonwoven technologies. For the complexity and randomness of nonwovens morphologic structures, it is difficult to express them effectively using classical method. Fracta...Nonwovens are fiber materials which are based on nonwoven technologies. For the complexity and randomness of nonwovens morphologic structures, it is difficult to express them effectively using classical method. Fractal geometry gives us a new idea and a powerful tool to study on irregularity of geometric objects. Therefore, we studied on the pore size, pore shape, pore size distribution and fiber orientation distribution of real nonwovens using fractal geometry combined with computer image analysis to evaluate nonwovens’ morphologic structures.展开更多
提出了一种基于低密度分割几何距离的半监督KFDA(kernelFisherdiscriminantanalysis)算法(semisupervised KFDA based on low density separation geometry distance,简称Semi GKFDA).该算法以低密度分割几何距离作为相似性度量,通过大...提出了一种基于低密度分割几何距离的半监督KFDA(kernelFisherdiscriminantanalysis)算法(semisupervised KFDA based on low density separation geometry distance,简称Semi GKFDA).该算法以低密度分割几何距离作为相似性度量,通过大量无标签样本,提高KFDA算法的泛化能力.首先,利用核函数将原始空间样本数据映射到高维特征空间中;然后,通过有标签样本和无标签样本构建低密度分割几何距离测度上的内蕴结构一致性假设,使其作为正则化项整合到费舍尔判别分析的目标函数中;最后,通过求解最小化目标函数获得最优投影矩阵.人工数据集和UCI数据集上的实验表明,该算法与KFDA及其改进算法相比,在分类性能上有显著提高.此外,将该算法与其他算法应用到人脸识别问题中进行对比,实验结果表明,该算法具有更高的识别精度.展开更多
AIM: To introduce a computer-aided morphometric method for quantifying the necro-inflammatory phase in liver biopsy specimens using fractal geometry and Delaunay's triangulation.METHODS: Two-micrometer thick biops...AIM: To introduce a computer-aided morphometric method for quantifying the necro-inflammatory phase in liver biopsy specimens using fractal geometry and Delaunay's triangulation.METHODS: Two-micrometer thick biopsy sections taken from 78 chronic hepatitis C virus-infected patients were immunohistochemically treated to identify the inflammatory cells. An automatic computer-aided image analysis system was used to define the inflammatory cell network defined on the basis of Delaunay's triangulation,and the inflammatory cells were geometrically classified as forming a cluster (an aggregation of a minimum of three cells) or as being irregularly distributed within the tissue. The phase of inflammatory activity was estimated using Hurst's exponent.RESULTS: The proposed automatic method was rapid and objective. It could not only provide rigorous results expressed by scalar numbers, but also allow the state of the whole organ to be represented by Hurst's exponent with an error of no more than 12%.CONCLUSION: The availability of rigorous metrical measures and the reasonable representativeness of the status of the organ as a whole raise the question as to whether the indication for hepatic biopsy should be revised by establishing clear rules concerning the contraindications suggested by its invasiveness and subjective interpretation.展开更多
Plant roots play important roles in acquisition of water and nutrients, storage, anchoring, transport, and symbiosis with soil microorganisms, thus quantitative researches on root developmental processes are essential...Plant roots play important roles in acquisition of water and nutrients, storage, anchoring, transport, and symbiosis with soil microorganisms, thus quantitative researches on root developmental processes are essential to understand root functions and root turnover in ecosystems,and at the same time such researches are the most difficult because roots are hidden underground. Therefore, how to investigate efficiently root functions and root dynamics is the core aspect in underground ecology. In this article, we reviewed some experimental methods used in root researches on root development and root system architecture, and summarized the advantages and shortages of these methods. Based on the analyses, we proposed three new ways to more understand root processes：（1） new experimental materials for root development;（2） a new observatory system comprised of multiple components, including many observatory windows installed in field, analysis software,and automatic data transport devices;（3） new techniques used to analyze quantitatively functional roots.展开更多
文摘Nonwovens are fiber materials which are based on nonwoven technologies. For the complexity and randomness of nonwovens morphologic structures, it is difficult to express them effectively using classical method. Fractal geometry gives us a new idea and a powerful tool to study on irregularity of geometric objects. Therefore, we studied on the pore size, pore shape, pore size distribution and fiber orientation distribution of real nonwovens using fractal geometry combined with computer image analysis to evaluate nonwovens’ morphologic structures.
文摘提出了一种基于低密度分割几何距离的半监督KFDA(kernelFisherdiscriminantanalysis)算法(semisupervised KFDA based on low density separation geometry distance,简称Semi GKFDA).该算法以低密度分割几何距离作为相似性度量,通过大量无标签样本,提高KFDA算法的泛化能力.首先,利用核函数将原始空间样本数据映射到高维特征空间中;然后,通过有标签样本和无标签样本构建低密度分割几何距离测度上的内蕴结构一致性假设,使其作为正则化项整合到费舍尔判别分析的目标函数中;最后,通过求解最小化目标函数获得最优投影矩阵.人工数据集和UCI数据集上的实验表明,该算法与KFDA及其改进算法相比,在分类性能上有显著提高.此外,将该算法与其他算法应用到人脸识别问题中进行对比,实验结果表明,该算法具有更高的识别精度.
基金Supported by the "Michele Rodriguez" Foundation, Institute for Quantitative Measures in Medicine, Milan, Italy
文摘AIM: To introduce a computer-aided morphometric method for quantifying the necro-inflammatory phase in liver biopsy specimens using fractal geometry and Delaunay's triangulation.METHODS: Two-micrometer thick biopsy sections taken from 78 chronic hepatitis C virus-infected patients were immunohistochemically treated to identify the inflammatory cells. An automatic computer-aided image analysis system was used to define the inflammatory cell network defined on the basis of Delaunay's triangulation,and the inflammatory cells were geometrically classified as forming a cluster (an aggregation of a minimum of three cells) or as being irregularly distributed within the tissue. The phase of inflammatory activity was estimated using Hurst's exponent.RESULTS: The proposed automatic method was rapid and objective. It could not only provide rigorous results expressed by scalar numbers, but also allow the state of the whole organ to be represented by Hurst's exponent with an error of no more than 12%.CONCLUSION: The availability of rigorous metrical measures and the reasonable representativeness of the status of the organ as a whole raise the question as to whether the indication for hepatic biopsy should be revised by establishing clear rules concerning the contraindications suggested by its invasiveness and subjective interpretation.
基金supported by the project of public benefits in China(No.201503221)the open fund in the Institute of Root Biology,Yangtze University
文摘Plant roots play important roles in acquisition of water and nutrients, storage, anchoring, transport, and symbiosis with soil microorganisms, thus quantitative researches on root developmental processes are essential to understand root functions and root turnover in ecosystems,and at the same time such researches are the most difficult because roots are hidden underground. Therefore, how to investigate efficiently root functions and root dynamics is the core aspect in underground ecology. In this article, we reviewed some experimental methods used in root researches on root development and root system architecture, and summarized the advantages and shortages of these methods. Based on the analyses, we proposed three new ways to more understand root processes：（1） new experimental materials for root development;（2） a new observatory system comprised of multiple components, including many observatory windows installed in field, analysis software,and automatic data transport devices;（3） new techniques used to analyze quantitatively functional roots.
