Virtual Sensor Network Research Articles

A novel interest coverage method based on Jensen-Shannon Divergence in sensor networks

In this paper, the idea of interest coverage is provided to form clusters in sensor network, which mean that the distance among data trends gathered by neighbor sensors is so small that, in some period, those sensors can be clustered, and certain sensor can be used to replace the cluster to form the virtual sensor network topology. In detail, the Jensen-Shannon Divergence (JSD) is used to characterize the distance among different distributions which represent the data trend of sensors. Then, based on JSD, a hierarchical clustering algorithm is provided to form the virtual sensor network topology. Simulation shows that the proposed approach gains more than 50% energy saving than Statistical Aggregation Methods (SAM) which transmitted data gathered by sensor only when the difference among data exceed certain threshold.

Fuzzy preserving virtual polar coordinate space sensor networks for mobility performance consideration

One of the major problems in sensor networks is how to build a topology aligned to the practical environment. This paper presents a novel method for building a logical tree using Virtual Polar Coordinate Space (VPCS). This tree structure gives every node a pair of IDs representing an included angle. The angle range is a characteristic that indicates the relationship between the current node and the destination node. In such a structure, efficient routing strategies for utilising cross-links are provided without additional information. The maintenance of tree structure in a mobile environment is considered. This tree-like architecture is suitable for organising in sensor networks; however, it is a challenge to maintain the tree-like architecture, especially in sensor networks, each node can only provide limited functions. The essential point of this paper is to preserve the angle range for handling node's variations and a fuzzy system is adopted to estimate the preserving range.