Currently, access control is facing many issues for information protection in the ubiquitous sensor network (USN) environment. In particular, dynamic access control is a central problem where context always changes because of volatile ubiquitous sensors. The use of context is important in USN. In this paper, we focus on the context-driven privacy protection model. In context-based access control research, the access permission technique that uses context is being intensely investigated because of the ease with which various dynamic access permissions can be assigned in accordance with the various changes in context. A key feature of this approach is dynamic access control. Therefore, we propose a model for privacy preservation that is context-based dynamic access control that uses intuitive 5W1H for USN. According to this model, the access control strategy can be determined dynamically based on context elements and subject attributes, in addition to objects and operations, using access control entities; therefore, it is relatively easy to infer the dynamic access control of context expressivity both accurately and efficiently.
This paper proposes MDRDP (Metadata Registry based on Data Profiling) to minimize the time and human resource for analyzing and extracting metadata as criteria standard for data profiling. MDRDP is based on MDR (Metadata Registry) which is used for an international standard of standardizing and managing metadata for information sharing in various fields. By MDRDP, we can evaluate data quality with authorize metadata using methodology of data profiling. MDR can guarantee the quality of metadata so that results of quality evaluation would improve.
Media synchronization is an important issue to be solved in order to achieve satisfactory video communication quality in 3G-324M mobile video telephony. This paper analyzes weaknesses of existing solutions and telephony protocols from the aspect of synchronization, and proposes an enhanced mobile media synchronization scheme. The scheme consists of dynamic multiplex code selection (DMCS) and a frame-to-frame (F2F) adaptive playout strategy (F2F-APS). The DMCS is to construct a plurality of multiplex codes for one channel and select an optimal multiplex code from those based on the send-buffer occupancy and the F2F-APS is an adaptive playout strategy based on frame-to-frame delay at the receiver. In order to evaluate the method, we implemented it in the control application of a real 3G mobile phone and measured the media synchronization error. The experimental results show that the synchronization inconsistency between audio and video streams can be decreased by more than 10% compared to a conventional scheme in a highly erroneous environment.
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