An improved decision tree method for web information retrieval with self-mapping attributes is proposed.The self-mapping tree has a value of self-mapping attribute in its internal node,and information based on dissimi...An improved decision tree method for web information retrieval with self-mapping attributes is proposed.The self-mapping tree has a value of self-mapping attribute in its internal node,and information based on dissimilarity between a pair of mapping sequences.This method selects self-mapping which exists between data by exhaustive search based on relation and attribute information.Experimental results confirm that the improved method constructs comprehensive and accurate decision tree.Moreover,an example shows that the self-mapping decision tree is promising for data mining and knowledge discovery.展开更多
城市滨水空间作为城市设计的主要组成部分,对提升居民生活质量、延续城市精神文脉、推动城市经济发展具有重要意义。为探究近年来城市设计过程中国内外滨水空间的研究进展与方向,运用Cite Space文献计量软件,以Web of Science及CNKI核...城市滨水空间作为城市设计的主要组成部分,对提升居民生活质量、延续城市精神文脉、推动城市经济发展具有重要意义。为探究近年来城市设计过程中国内外滨水空间的研究进展与方向,运用Cite Space文献计量软件,以Web of Science及CNKI核心数据库为基础,通过梳理1999年至2023年国内外滨水空间相关文献,对国内外滨水空间研究现状、热点、前沿与主题4个方面进行综合分析,进而从研究内容、视角、方法、机制4个方面对未来国内外滨水空间的相关研究提出建议。研究结果表明,国内外发文量整体呈上升趋势,且均以滨水区的更新改造及生态系统修复为热点议题。此外,国内有关滨水区的相关研究注重对国外滨水区开发经验的总结,而国外则更注重对滨水空间发展效应及管理机制的探讨。展开更多
Deep Web自动分类是建立深网数据集成系统的前提和基础。提出了一种基于领域特征文本的Deep Web分类方法。首先借助本体知识对表达同一语义的不同词汇进行了概念抽象,进而给出了领域相关度的定义,并将其作为特征文本选择的量化标准,避...Deep Web自动分类是建立深网数据集成系统的前提和基础。提出了一种基于领域特征文本的Deep Web分类方法。首先借助本体知识对表达同一语义的不同词汇进行了概念抽象,进而给出了领域相关度的定义,并将其作为特征文本选择的量化标准,避免了人为选取的主观性和不确定性;在接口向量模型构建中,考虑了不同特征文本对于分类作用的差异,提出了一种改进的W-TFIDF权重计算方法;最后采用KNN算法对接口向量进行了分类。对比实验证明,利用所提方法选择的特征文本是准确有效的,新的特征文本权重计算方法能显著地提高分类精度,且在KNN算法中表现出较好的稳定性。展开更多
文摘An improved decision tree method for web information retrieval with self-mapping attributes is proposed.The self-mapping tree has a value of self-mapping attribute in its internal node,and information based on dissimilarity between a pair of mapping sequences.This method selects self-mapping which exists between data by exhaustive search based on relation and attribute information.Experimental results confirm that the improved method constructs comprehensive and accurate decision tree.Moreover,an example shows that the self-mapping decision tree is promising for data mining and knowledge discovery.
文摘城市滨水空间作为城市设计的主要组成部分,对提升居民生活质量、延续城市精神文脉、推动城市经济发展具有重要意义。为探究近年来城市设计过程中国内外滨水空间的研究进展与方向,运用Cite Space文献计量软件,以Web of Science及CNKI核心数据库为基础,通过梳理1999年至2023年国内外滨水空间相关文献,对国内外滨水空间研究现状、热点、前沿与主题4个方面进行综合分析,进而从研究内容、视角、方法、机制4个方面对未来国内外滨水空间的相关研究提出建议。研究结果表明,国内外发文量整体呈上升趋势,且均以滨水区的更新改造及生态系统修复为热点议题。此外,国内有关滨水区的相关研究注重对国外滨水区开发经验的总结,而国外则更注重对滨水空间发展效应及管理机制的探讨。
基金Projects(41074010,41171343)supported by the National Natural Science Foundation of ChinaProject(BK20140185)supported by Jiangsu Province Natural Science Foundation for Youths,China+1 种基金Project(51204185)supported by National Youth Science Foundation of ChinaProject(2014QNA44)supported by Youth Science Fund of China University of Mining and Technology