On the Consecutive-Retrieval Problem
SIAM Journal on Computing
Database management systems
A survey of key management for secure group communication
ACM Computing Surveys (CSUR)
Algorithmic Graph Theory and Perfect Graphs (Annals of Discrete Mathematics, Vol 57)
Algorithmic Graph Theory and Perfect Graphs (Annals of Discrete Mathematics, Vol 57)
Graph Theory With Applications
Graph Theory With Applications
Journal of Computer and System Sciences
Inferring social networks from outbreaks
ALT'10 Proceedings of the 21st international conference on Algorithmic learning theory
On the hardness and approximation of minimum topic-connected overlay
Proceedings of the 30th annual ACM SIGACT-SIGOPS symposium on Principles of distributed computing
On the approximability of minimum topic connected overlay and its special instances
MFCS'11 Proceedings of the 36th international conference on Mathematical foundations of computer science
On the approximability and hardness of minimum topic connected overlay and its special instances
Theoretical Computer Science
Hi-index | 0.05 |
We consider the following complete optimal stars-clustering-tree problem: Given a complete graph G=(V,E) with a weight on every edge and a collection of subsets of V, we want to find a minimum weight spanning tree T such that each subset of the vertices in the collection induces a complete star in T. One motivation for this problem is to construct a minimum cost (weight) communication tree network for a collection of (not necessarily disjoint) groups of customers such that each group induces a complete star. As a result the network will provide a ''group broadcast'' property, ''group fault tolerance'' and ''group privacy''. We present another motivation from database systems with replications. For the case where the intersection graph of the subsets is connected we present a structure theorem that describes all feasible solutions. Based on it we provide a polynomial algorithm for finding an optimal solution. For the case where each subset induces a complete star minus at most k leaves we prove that the problem is NP-hard.