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To enhance power efficiency of battery powered wireless access devices, the behaviors of the mobile stations (MS) working in the sleep mode operation in IEEE 802.16e was researched with a method of the Markov chain model. By exploring the relationship among traffic load, power consumption and delay, we present a cross-layer design-based algorithm to tune the initial sleep window according to the randomization...
Ontology, which is a conceptional model to describe conceptions and the relationships of conceptions, originates from philosophy, is not only static but also dynamic. In PKI, static characteristics of trust model which based on CA can not satisfy dynamic collaboration and uncertainty of environment. To deal with the problem, on the basis of dynamic characteristics of trust model and ontology, it is...
In this paper, we propose a dynamic traffic load-aware sleep mode operation to improve the power efficiency of battery powered IEEE 802.16e devices. By analyzing the sleep mode operation with a Markov chain model, we explore the relationship among traffic load, power consumption and idle check time. Based on the analytical results, we propose a dynamic algorithm to tune the idle check time according...
The video streams of backgrounds are frequently influenced by the background changes (e.g. illumination changes and changes due to adding or removing parts of the background). Further more, the quality of the foreground and the segmented image of hand gesture severely drops. We propose a novel method, which is based on difference background image between consecutive video frames, of using the '3sigma...
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