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With the integration of wind generators in the distributed network, the power flow and fault current characteristic have been changed. The negative sequence impedance of the doubly fed induction generator (DFIG) is quite different from the positive sequence impedance after the crowbar circuit is activated. This characteristic poses a big challenge on the operation of the protection system. Traditional...
Designing a lifetime-maximization routing in wireless sensor networks poses a great challenge mainly due to unreliable wireless links and limited power supply. Recently, two natural advantages of opportunistic routing, i.e., path diversity and the improvement of transmission reliability, are exploited to develop a lifetime-extended opportunistic routing for wireless sensor networks. Besides, asynchronous...
In this paper, we investigate the power saving issue in cognitive radio (CR) multi-hop relay network. Due to the dynamic property of the wireless channel, the quality of service (QoS) guarantee for multi-hop transmission is quite challenging. To deal with these problems, automatic repeat-request (ARQ) protocol in an end-to-end manner is incorporated. For multi-hop transmission evaluation purpose,...
In recent years, wireless sensor networks are widely used in various applications. This paper proposes a data gathering protocol with mobile relays to solve the partition problem of sensor network. When some sensor nodes have exhausted their batteries or are failure, some holes occur in the network topology. Because of the existence and enlargement of the holes, the sensor network is partitioned into...
This paper discusses how to dispatch mobile resources to provide services for users in wireless sensor networks. The sensor nodes are able to dispatch these mobile resources by themselves, when they detect events and need the special services of mobile resources. This paper presents four mobile resource dispatch mechanisms according to two objective functions, where one centralized mechanism and three...
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