부산대학교 도서관

We propose a novel data dissemination scheme in wireless sensor networks which achieves energy efficiency by avoiding query flooding and extra data transmission on data storage elsewhere. Moreover, our method achieves further energy efficiency by reducing dissemination of redundant data. In addition, services for data retrieval in multiple levels of detail are provided. Our scheme consists of a localized data-source-forming algorithm and a hierarchical multi-resolution querying scheme which includes a localized node-selection algorithm and a set of registration points (geographical locations) for each type of task. Simulation results show that the performance of our method is much better than early methods like directed diffusion.