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The characteristics such as high reliability, high scalability, fault tolerance, low cost and rapid deployment make wireless sensor networks (WSN) useful in many military and civilian applications. The limitation of sensor nodes energy necessitates that energy saving is a key issue in WSN. This paper proposes a novel cluster-based data fusion algorithm for(More)
Service-oriented grid environment enables a new way of service provisioning based on utility computing models, where users consume services based on their QoS (Quality of Service) requirements. In such “pay-per-use” Grids, workflow execution cost must be considered during scheduling based on users’ QoS constraints. In this paper, we propose a(More)
With the development of data collection technology, effective visualization tools are needed urgently to understand the abundant multidimensional and multivariate data and information in the science, engineering and commerce fields. Star Coordinates is a traditional multivariate data visualization technique, but there are some limitations of it. In the(More)
Because of there being massive complex and unknown nonlinear systems in practice, and being difficulty to obtain their precise mathematical modes, there were very difficulty to use conventional feedback linearization method to design nonlinear control systems. Powerful support was provided for identification and modeling of nonlinear systems along with(More)
Data aggregation is an effectual approach for wireless sensor networks (WSNs) to save energy and prolong network lifetime. A novel unequal cluster-based data aggregation protocol is proposed in this paper. It divides the network into some grids with unequal sizes, and implements cluster head rotation in each grid respectively. It is able to balance energy(More)
A challenging issue in emerging Peer-to-Peer (P2P) systems is the efficient locating appropriate resource within the great amount of available resources. To group peers with similar cooperative services into the same community appears very promising. However, most of the existing P2P systems group peers statically under the assumption of steady topology(More)
The routing void emerges in wireless sensor networks, when the density of sensor node is low or special geography factors appear. To handle the routing void problem, many methods were proposed under different routing protocol, while most of them are complex or demanding for sensor nodes. After analyzing the shortages of former methods, this paper improved(More)
Unmanned Aerial Vehicle (UAV) landing safely is key and difficult on UAV research. In order to improve the security of UAV landing on the flight strip, a vision-based method was presented for attitude and position estimation of it, based a few feature points distributed on the ground arbitrarily. Calculating the attitude and position relative to runway is(More)