Outlier detection has very important applied value in data mining literature. Different outlier detection algorithms based on distinct theories have different definitions and mining processes. The three-dimensional sp...Outlier detection has very important applied value in data mining literature. Different outlier detection algorithms based on distinct theories have different definitions and mining processes. The three-dimensional space graph for constructing applied algorithms and an improved GridOf algorithm were proposed in terms of analyzing the existing outlier detection algorithms from criterion and theory. Key words outlier - detection - three-dimensional space graph - data mining CLC number TP 311. 13 - TP 391 Foundation item: Supported by the National Natural Science Foundation of China (70371015)Biography: ZHANG Jing (1975-), female, Ph. D, lecturer, research direction: data mining and knowledge discovery.展开更多
We study in this paper a Hilbert space HV associated with the coarse geometry of an infinite connected graph X(V, E) with vertex set V and edge set E. We show that X(V,E) is uniformly expanding if and only ifl2(V)can ...We study in this paper a Hilbert space HV associated with the coarse geometry of an infinite connected graph X(V, E) with vertex set V and edge set E. We show that X(V,E) is uniformly expanding if and only ifl2(V)can be continuously included in HV as a closed subspace,and that the inner product structure of HV is topologically invariant under uniform coarsening of the graph. We also discuss the functorial properties of these Hilbert spaces.展开更多
In this paper, we propose a new perspective to discuss the N-order fixed point theory of set-valued and single-valued mappings. There are two aspects in our work: we first define a product metric space with a graph fo...In this paper, we propose a new perspective to discuss the N-order fixed point theory of set-valued and single-valued mappings. There are two aspects in our work: we first define a product metric space with a graph for the single-valued mapping whose conversion makes the results and proofs concise and straightforward, and then we propose an <em>SG</em>-contraction definition for set-valued mapping which is more general than some recent contraction’s definition. The results obtained in this paper extend and unify some recent results of other authors. Our method to discuss the N-order fixed point unifies <em>N</em>-order fixed point theory of set-valued and single-valued mappings.展开更多
By introducing the notions of L-spaces and L_r-spaces, a complete generalization of Kalton's closed graph theorem is obtained. It points out the class of L_r-spaces is the maximal class of range spaces for the clo...By introducing the notions of L-spaces and L_r-spaces, a complete generalization of Kalton's closed graph theorem is obtained. It points out the class of L_r-spaces is the maximal class of range spaces for the closed graph theorem when the class of domain spaces is the class of Mackey spaces with weakly * sequentially complete dual.Some examples are constructed showing that the class of L_r-spaces is strictly larger than the class of separable B_r-complete spaces.Some properties of L-spaces and L_r-spaces are discussed and the relations between B-complete (resp. B_r-complete) spaces and L-spaces (resp. L_r-spaces) are given.展开更多
2013年以来,随着寒冷地区资源开发利用与工程建设规模不断扩大,国内外冻融岩石力学研究发展迅速。论文以2013~2020年Web of Science和CNKI数据库收录的冻融岩石力学领域相关论文为数据源,使用文献可视化软件CiteSpace构建了国内外冻融...2013年以来,随着寒冷地区资源开发利用与工程建设规模不断扩大,国内外冻融岩石力学研究发展迅速。论文以2013~2020年Web of Science和CNKI数据库收录的冻融岩石力学领域相关论文为数据源,使用文献可视化软件CiteSpace构建了国内外冻融岩石力学研究的关键词共现网络、热点知识演进时区视图和发文高产机构知识图谱,并进行了图谱可视化分析。结合统计结果与知识图谱研究发现:(1)国内外冻岩力学研究处于快速发展阶段,参与国家和创新性研究成果逐年增加,研究状态火热;(2)论文在核心期刊与研究机构中的分布集中度较高,企业、科研院所课题研究参与度较低,难以发挥"产学研"综合优势;(3)热点研究可概括为冻融岩石多尺度力学损伤特性、裂隙岩体冻融损伤机制、岩石本构模型及数值模拟研究;(4)岩石多场耦合作用、成熟研究成果的工程转化运用将是后续研究的重点关注方向。展开更多
物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视...物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视化分析,发现近几年物流配送研究出现较为明显的变化:一些传统研究热点如配送路径规划、第三方物流等在2018年研究热度纷纷减退,而跨境物流、电子商务等占据研究主流,研究涉及众包物流、智慧物流、干扰管理等新热点,整体物流配送研究开始向高质量、高效率方向迈进。展开更多
随着社交媒体的进一步普及,衍生出了结合社会化特征和电子商务特征的社会化商务,并且成为近十年的研究热点,而社会化商务意愿因其能够预测消费者行为而受到了研究者的广泛关注。研究利用Citespace从WOS(Web of Science)中搜集了674篇关...随着社交媒体的进一步普及,衍生出了结合社会化特征和电子商务特征的社会化商务,并且成为近十年的研究热点,而社会化商务意愿因其能够预测消费者行为而受到了研究者的广泛关注。研究利用Citespace从WOS(Web of Science)中搜集了674篇关于社会化商务意愿的学术论文,对其进行了回顾和分析,以期对该领域有一个更全面的认识。展开更多
文摘Outlier detection has very important applied value in data mining literature. Different outlier detection algorithms based on distinct theories have different definitions and mining processes. The three-dimensional space graph for constructing applied algorithms and an improved GridOf algorithm were proposed in terms of analyzing the existing outlier detection algorithms from criterion and theory. Key words outlier - detection - three-dimensional space graph - data mining CLC number TP 311. 13 - TP 391 Foundation item: Supported by the National Natural Science Foundation of China (70371015)Biography: ZHANG Jing (1975-), female, Ph. D, lecturer, research direction: data mining and knowledge discovery.
基金This research is supported by the NSF from Shanghai Science and Technology Commission, No.01ZA14003.
文摘We study in this paper a Hilbert space HV associated with the coarse geometry of an infinite connected graph X(V, E) with vertex set V and edge set E. We show that X(V,E) is uniformly expanding if and only ifl2(V)can be continuously included in HV as a closed subspace,and that the inner product structure of HV is topologically invariant under uniform coarsening of the graph. We also discuss the functorial properties of these Hilbert spaces.
文摘In this paper, we propose a new perspective to discuss the N-order fixed point theory of set-valued and single-valued mappings. There are two aspects in our work: we first define a product metric space with a graph for the single-valued mapping whose conversion makes the results and proofs concise and straightforward, and then we propose an <em>SG</em>-contraction definition for set-valued mapping which is more general than some recent contraction’s definition. The results obtained in this paper extend and unify some recent results of other authors. Our method to discuss the N-order fixed point unifies <em>N</em>-order fixed point theory of set-valued and single-valued mappings.
文摘By introducing the notions of L-spaces and L_r-spaces, a complete generalization of Kalton's closed graph theorem is obtained. It points out the class of L_r-spaces is the maximal class of range spaces for the closed graph theorem when the class of domain spaces is the class of Mackey spaces with weakly * sequentially complete dual.Some examples are constructed showing that the class of L_r-spaces is strictly larger than the class of separable B_r-complete spaces.Some properties of L-spaces and L_r-spaces are discussed and the relations between B-complete (resp. B_r-complete) spaces and L-spaces (resp. L_r-spaces) are given.
文摘2013年以来,随着寒冷地区资源开发利用与工程建设规模不断扩大,国内外冻融岩石力学研究发展迅速。论文以2013~2020年Web of Science和CNKI数据库收录的冻融岩石力学领域相关论文为数据源,使用文献可视化软件CiteSpace构建了国内外冻融岩石力学研究的关键词共现网络、热点知识演进时区视图和发文高产机构知识图谱,并进行了图谱可视化分析。结合统计结果与知识图谱研究发现:(1)国内外冻岩力学研究处于快速发展阶段,参与国家和创新性研究成果逐年增加,研究状态火热;(2)论文在核心期刊与研究机构中的分布集中度较高,企业、科研院所课题研究参与度较低,难以发挥"产学研"综合优势;(3)热点研究可概括为冻融岩石多尺度力学损伤特性、裂隙岩体冻融损伤机制、岩石本构模型及数值模拟研究;(4)岩石多场耦合作用、成熟研究成果的工程转化运用将是后续研究的重点关注方向。
文摘物流配送是物流业及物流系统的关键部分,高效、高质量地发展物流配送既是国家政策的要求,又是服务新零售、新制造等业态的必然要求。在此背景下,通过Cite Space V软件对2013-2019年中国知网CNKI关于“物流配送”共计1706篇文献进行可视化分析,发现近几年物流配送研究出现较为明显的变化:一些传统研究热点如配送路径规划、第三方物流等在2018年研究热度纷纷减退,而跨境物流、电子商务等占据研究主流,研究涉及众包物流、智慧物流、干扰管理等新热点,整体物流配送研究开始向高质量、高效率方向迈进。
文摘随着社交媒体的进一步普及,衍生出了结合社会化特征和电子商务特征的社会化商务,并且成为近十年的研究热点,而社会化商务意愿因其能够预测消费者行为而受到了研究者的广泛关注。研究利用Citespace从WOS(Web of Science)中搜集了674篇关于社会化商务意愿的学术论文,对其进行了回顾和分析,以期对该领域有一个更全面的认识。
