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Sensor nodes are resource-constrained, such as low battery life, computation, bandwidth and memory, so traditional public key schemes are impractical in wireless sensor networks. In the previous schemes, symmetric cryptography is the most common method used in sensor nodes. How to distribute keys into every sensor node is an important issue in many(More)
In recent years, on the researches in various routing protocols, applications to digital home wireless heterogeneous networks become more and more important. In this paper, we propose a routing protocol based on event-oriented applied for digital home wireless heterogeneous networks, and a knowledge discovery agent will dynamically maintain an n-bits map(More)
IPTV (Internet Protocol Television) is a very important field in the network development. Comparing to the traditional television, the IPTV combines the digital contents like media. The communication and the advertisement with the interaction serve into the emerging business model to provide the users to watch television service. Because the IPTV contains(More)
This study used the US Patent Application Database to identify who files provisional applications in the United States. Preference ratios, use ratios, and provisional application to nonprovisional application ratios were used to evaluate the filing behavior of applicants in filing provisional applications with respect to nonprovisional applications. Factors(More)