Browsing by Author "Feng, Yan"

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Centralized and decentralized rumor blocking problems
(2017-07-01)
Chen, Xin
;
Nong, Qingqin
;
Feng, Yan
;
Cao, Yongchang
;
Gong, Suning
This paper consists of two parts. In the first part, we study a centralized rumor blocking problem with a novel social objective function different from those in the literature. We will show that this objective function is non-decreasing and submodular and hence corresponding rumor blocking problem has a greedy approximation with objective function value at least of the optimal. In the second part, we study a decentralized rumor blocking problem with two selfish protectors, which falls into a 2-player non-cooperate game model. We will show that this game is a basic valid utility system and hence the social utility of any Nash equilibrium in the game is at least a half of the optimal social utility.