Qi Xiaogang

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An ant colony optimization-based dynamic energy efficient mobile agent routing algorithm (ADEEMA) is presented in this paper. In this algorithm, mobile agent (MA) has the character of an ant, and a novel probabilistic model is constructed to make MA can find an energy efficient route from processing node (PN) to target nodes (TN). The route considers both(More)
In Cognitive radio networks (CRN), secondary users(SUs) can access the unlicensed channel dymanically, but must vacate the spectrum on the appearance of primary users(PUs). Therefore multiple SUs will be affected, which will cause the network partition if there is no other backup channels. We combine power control and channel assignment to construct a(More)
Many works have been devoted to connectivity of wireless sensor networks. This is an important feature for wireless sensor networks (WSNs) to provide the nodes with the capability of communicating with one or several sinks.To operate successfully a sensor network must also provide satisfactory connectivity so that nodes can communicate for data fusion and(More)
We study the probe selection problem in all-optical networks for achieving unambiguous faulty links localization with two monitors in failure detection phase and one monitor in failure localization phase. The existing random walk algorithm can find feasible solutions to localize the faulty links unambiguously, but it consumed large number of probes and(More)
With the current communication network failures intensifying, they have characteristics of complexity and adaptability. This is no longer possible that networks can completely resist all kinds of network attacks. Targeted attacks and random failures may cause link or node removal, which in turn can cause significant disruption to the availability of network(More)
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