Network security policy and the automated refinement of its hierarchies aims to simplify the administration of security services in complex network environments. The semantic gap between the policy hierarchies reflect...Network security policy and the automated refinement of its hierarchies aims to simplify the administration of security services in complex network environments. The semantic gap between the policy hierarchies reflects the validity of the policy hierarchies yielded by the automated policy refinement process. However, little attention has been paid to the evaluation of the compliance between the derived lower level policy and the higher level policy. We present an ontology based on Ontology Web Language （OWL） to describe the semantics of security policy and their implementation. We also propose a method of estimating the semantic similarity between a given展开更多
Due to the various performance requirements and data access restrictions of different types of real-time transactions, concurrency control protocols which had been designed for the systems with single type of transact...Due to the various performance requirements and data access restrictions of different types of real-time transactions, concurrency control protocols which had been designed for the systems with single type of transactions are not sufficient for mixed real-time database systems (MRTDBS), where different types of real-time transactions coexist in the systems concurrently. In this paper, a new concurrency control protocol MRTT_CC for mixed real-time transactions is proposed. The new strategy integrates with different concurrency control protocols to meet the deadline requirements of different types of real-time transactions. The data similarity concept is also explored in the new protocol to reduce the blocking time of soft real-time transactions, which increases their chances to meet the deadlines. Simulation experiments show that the new protocol has gained good performance.展开更多
Web 2.0信息时代,信息量迅速增加,信息检索速率却显著降低,如何提高信息的自动分类管理水平,从海量数据中高效、准确、快速获取有价值的信息与知识成为智慧图书馆亟待研究与解决的问题。文章提出了在数字图书馆服务中运用新型文本聚类...Web 2.0信息时代,信息量迅速增加,信息检索速率却显著降低,如何提高信息的自动分类管理水平,从海量数据中高效、准确、快速获取有价值的信息与知识成为智慧图书馆亟待研究与解决的问题。文章提出了在数字图书馆服务中运用新型文本聚类群智能分析方法。该算法通过改进文本间的语义相似度计算,融合K-means聚类算法与蚁群聚类算法(Ant Colony Optimization,ACO)的优点,在初始分类时将K-means聚类算法用作快速分类,用分类结果指导更新蚂蚁各途径信息素,指导蚂蚁后续聚类途径选择,提高聚类运行效率。该分析方法因为不需要类别的信息,能自动完成文本分组,所以可以更好地应用到图书馆资源的推荐与检索服务中。图书馆数字文本数据库实验证明,混合蚁群聚类算法比单独的K-means、ACO都具有更好的聚类效果,可以看出该算法的有效性。展开更多
针对裂缝自动检测任务中难以获取大量精确标注样本数据的问题,提出LGS-Net(Local Global Similarity-Network)模型。LGS-Net的核心在于利用裂缝图像区域的语义相似性,有效结合少量已标注数据和大量未标注图像数据,通过半监督学习实现裂...针对裂缝自动检测任务中难以获取大量精确标注样本数据的问题,提出LGS-Net(Local Global Similarity-Network)模型。LGS-Net的核心在于利用裂缝图像区域的语义相似性,有效结合少量已标注数据和大量未标注图像数据,通过半监督学习实现裂缝自动检测。为全面评估LGS-Net的性能,实验在GAPs384和Crack500数据集上进行验证。结果表明,在标注资源有限的情况下,LGS-Net能够实现高精度的裂缝检测。通过对检测结果的可视化分析,证明LGS-Net具有在复杂环境下有效识别裂缝的能力。LGS-Net利用路面裂缝图像的语义相似性特征进行检测,能为路面裂缝检测的工程应用提供技术支持。展开更多
基金the National Natural Science Foundation of China
文摘Network security policy and the automated refinement of its hierarchies aims to simplify the administration of security services in complex network environments. The semantic gap between the policy hierarchies reflects the validity of the policy hierarchies yielded by the automated policy refinement process. However, little attention has been paid to the evaluation of the compliance between the derived lower level policy and the higher level policy. We present an ontology based on Ontology Web Language （OWL） to describe the semantics of security policy and their implementation. We also propose a method of estimating the semantic similarity between a given
文摘Due to the various performance requirements and data access restrictions of different types of real-time transactions, concurrency control protocols which had been designed for the systems with single type of transactions are not sufficient for mixed real-time database systems (MRTDBS), where different types of real-time transactions coexist in the systems concurrently. In this paper, a new concurrency control protocol MRTT_CC for mixed real-time transactions is proposed. The new strategy integrates with different concurrency control protocols to meet the deadline requirements of different types of real-time transactions. The data similarity concept is also explored in the new protocol to reduce the blocking time of soft real-time transactions, which increases their chances to meet the deadlines. Simulation experiments show that the new protocol has gained good performance.
文摘针对裂缝自动检测任务中难以获取大量精确标注样本数据的问题,提出LGS-Net(Local Global Similarity-Network)模型。LGS-Net的核心在于利用裂缝图像区域的语义相似性,有效结合少量已标注数据和大量未标注图像数据,通过半监督学习实现裂缝自动检测。为全面评估LGS-Net的性能,实验在GAPs384和Crack500数据集上进行验证。结果表明,在标注资源有限的情况下,LGS-Net能够实现高精度的裂缝检测。通过对检测结果的可视化分析,证明LGS-Net具有在复杂环境下有效识别裂缝的能力。LGS-Net利用路面裂缝图像的语义相似性特征进行检测,能为路面裂缝检测的工程应用提供技术支持。
