RFID system is facing the serious problems of private security, which mainly consists of the leakage of tag sensitive information, tracking and monitoring spitefully the carrier of mobile tag. This paper constructs a coordination protection mechanism of tag private information by a variety of reader-writer, which solves the two questions mentioned above. Firstly, a trust-security mechanism used to ensure that the readers in system are trustful. Next, via intercommunication of the readers, the secret key, which is produced by the tag-charged reader, is divided and distributed to the various readers in system. The test result shows that attackers cannot gain the shared secret key from various readers, and he/she could only read an encoded data, thus the security of private information in tag is guaranteed. Additionally, a set of readers use coordination-protection mechanism, which is an efficient way to improve the expandability of the system.
Ghost towns of empty houses, short-lived buildings and plants functional change etc. are big building waste problems in China. To create a low-carbon society, reasonable reconstruction work is necessary. Also as the rapid development of high and new technology, building services is improved continuously. More energy efficient and reliable products are required. In this paper, the analysis on different type of building and services upgrading was carried out. For these upgrading schemes, their merits and disadvantages are discussed.
Studies have shown that influential nodes play an important role in all kinds of dynamic behavior in the complex network. Excavation or recognition of such nodes contributes to the development of application areas such as social network advertising and user interest recommendation. Although some heuristic algorithms such as degree, betweenness, closeness and k-shell (or k-core) can identify influential nodes at the same time, they are disadvantaged in terms of accuracy and time complexity. Based on this, the authors propose a novel local weight index to distinguish the node influence based on the theory of ties strength. This index emphasizes that the node influence is jointly decided by the quantity and quality of the neighbors, and its time complexity is much lower than closeness and betweenness. With the aid of SIR information transmission model, this paper verifies the validity of local weight index.
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