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基于最邻近模型的知识库多层次标签分类算法 被引量:4
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作者 黄秀彬 张莉 +2 位作者 王明珠 曹璐 赵志强 《电子设计工程》 2020年第20期120-124,共5页
传统的知识库多层次标签分类算法分类精度低,为了解决这一问题,基于最临近模型的知识库研究一种新的多层次标签分类算法。该算法对知识库多层次标签进行特征提取,将提取的对象标签特征进行特征降维,以此获得简化知识库多层次的特征空间... 传统的知识库多层次标签分类算法分类精度低,为了解决这一问题,基于最临近模型的知识库研究一种新的多层次标签分类算法。该算法对知识库多层次标签进行特征提取,将提取的对象标签特征进行特征降维,以此获得简化知识库多层次的特征空间,通过最临近模型计算简化知识库空间中对象特征之间的距离,通过计算结果完成多层次标签分类,实现基于最临近模型的知识库多层次标签分类算法研究。实验结果表明,基于最邻近模型的知识库多层次标签分类算法能够在短时间内实现精准分类。 展开更多
关键词 最邻近模型 知识库 多层次标签 分类算法
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Multi-level access control model for tree-like hierarchical organizations
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作者 於光灿 李瑞轩 +3 位作者 卢正鼎 Mudar Sarem 宋伟 苏永红 《Journal of Southeast University(English Edition)》 EI CAS 2008年第3期393-396,共4页
An access control model is proposed based on the famous Bell-LaPadula (BLP) model.In the proposed model,hierarchical relationships among departments are built,a new concept named post is proposed,and assigning secur... An access control model is proposed based on the famous Bell-LaPadula (BLP) model.In the proposed model,hierarchical relationships among departments are built,a new concept named post is proposed,and assigning security tags to subjects and objects is greatly simplified.The interoperation among different departments is implemented through assigning multiple security tags to one post, and the more departments are closed on the organization tree,the more secret objects can be exchanged by the staff of the departments.The access control matrices of the department,post and staff are defined.By using the three access control matrices,a multi granularity and flexible discretionary access control policy is implemented.The outstanding merit of the BLP model is inherited,and the new model can guarantee that all the information flow is under control.Finally,our study shows that compared to the BLP model,the proposed model is more flexible. 展开更多
关键词 multi-level access control hierarchical organization multiple security tags
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