Spatio-temporal database manages the large amount of spatial objects that change over time. It is necessary to query the spatio-temporal objects of the past and the current and to anticipate the future of spatio-tempo...Spatio-temporal database manages the large amount of spatial objects that change over time. It is necessary to query the spatio-temporal objects of the past and the current and to anticipate the future of spatio-temporal objects. It Is important to design an efficient index mechanism for accessing the spatio-temporal data efficiently. The paper analyzes the features of the spatio-temporal objects, studies the methods of spatio-temporal index mechanisms, classifies the index mechanisms, and discusses the key technologies of spatio-temporal indexes. And it also presents the index methods of STADBS that we are studying.展开更多
提出了一种普适计算环境下的时空访问控制模型STAC(Spatio-Temporal Access Control Model)。该模型基于主体、客体的时空属性进行动态授权,研究了主体在一定时间范围、一定空间区域内访问另一空间区域内客体的授权问题,描述了STAC模型...提出了一种普适计算环境下的时空访问控制模型STAC(Spatio-Temporal Access Control Model)。该模型基于主体、客体的时空属性进行动态授权,研究了主体在一定时间范围、一定空间区域内访问另一空间区域内客体的授权问题,描述了STAC模型的构成要素、体系结构和访问控制算法。该模型为解决普适计算环境下动态时空访问控制授权问题提供了一定的技术手段。展开更多
文摘Spatio-temporal database manages the large amount of spatial objects that change over time. It is necessary to query the spatio-temporal objects of the past and the current and to anticipate the future of spatio-temporal objects. It Is important to design an efficient index mechanism for accessing the spatio-temporal data efficiently. The paper analyzes the features of the spatio-temporal objects, studies the methods of spatio-temporal index mechanisms, classifies the index mechanisms, and discusses the key technologies of spatio-temporal indexes. And it also presents the index methods of STADBS that we are studying.
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.60773224)教育部科学技术研究重点项目(theKey Project of Chinese Ministry of Education under Grant No.107106)陕西省自然科学基金(the Natural Science Foundation ofShaanxi Province of China under Grant No.2006F27)
文摘提出了一种普适计算环境下的时空访问控制模型STAC(Spatio-Temporal Access Control Model)。该模型基于主体、客体的时空属性进行动态授权,研究了主体在一定时间范围、一定空间区域内访问另一空间区域内客体的授权问题,描述了STAC模型的构成要素、体系结构和访问控制算法。该模型为解决普适计算环境下动态时空访问控制授权问题提供了一定的技术手段。
