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There are some problems of the single perimeter alarm system, such as false positives, etc. As a result, a decision rule is proposed to fuse the alarm with the capacitor disturbance perimeter alarm and the video monitor. Firstly, the cross-correlation factor is introduced to improve the D-S evidence theory of fuzzy weighted support. Then, the characteristics of the capacitive disturbance perimeter alarm signal and the video signal and the corresponding Basic Probability Assignment (BPA) are extracted, and the cross-correlation between the evidences of the target recognition target are calculated. Finally, the cross-correlation is used to improve the D-S evidence theory of fuzzy weighted support.

Currently, WiFi (or IEEE 802.11) enabled infrastructures and devices have become ubiquitous, which makes it promising to provide indoor positioning services via WiFi signals. However, most existing studies on its performance are carried out based on simulations and experiments, and it is still challenging to mathematically characterize the localization error. Therefore, in this paper, the Cramer-Rao lower bound (CRLB) for the localization error by using WiFi signals is established and enables us to carry out a theoretical analysis on the fundamentals of WiFi based localization. Extensive experiments based on the well-known WiFi fingerprint-based localization are then carried out and confirm the correctness of the proposed CRLB model as well as the analysis.

Most modern multimedia applications rely on a group communication pattern. To protect the group communication data during transit, a symmetric key called group key must be used to encrypt all the group communication. Group rekeying is a key management mechanism that ensures that the group key is rekeyed upon every single change in membership. However, for most current group rekeying schemes, to rekey the group key, various degrees of side effects will be induced upon all the members in the same group. In this paper, based on trusted platform technology, we propose the first perfect zero side effect group rekeying scheme at the time of writing.