针对上述问题，提出动态空间集下的轮廓更新算法。
Aiming at such problem, this paper proposes a skyline updating algorithm in dynamic space set.
最后针对数据库的更新设计了动态聚类算法。
The dynamic clustering algorithm is developed to update the clusters.
算法采用按需路由发现过程，动态更新路由信息和建立多播转发组。
The algorithm applies on-demand procedures to dynamically refresh routes and build multicast forwarding group.
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