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Massive trust assessment (MTA) in an Online Social Network (OSN), i.e., computing the trustworthiness of all users in the network, is crucial in various OSN-related applications. Existing solutions are either too slow or inaccurate in addressing the MTA problem. We propose the OpinionWalk algorithm that accurately and efficiently conducts MTA in an OSN. OpinionWalk models trust by the Dirichlet distribution...
Trust is a hidden fabric of online social networks (OSNs) that enables online interactions, e.g., online transactions on Ebay. The fundamental properties of trust in OSNs, however, have not been adequately studied yet. In this work, we advance the understanding of trust in OSNs by analyzing the Advogato dataset [1]. We study the properties of direct trust, indirect trust, and trust community detection...
Assessing multi-hop interpersonal trust in online social networks (OSNs) is critical for many social network applications such as online marketing but challenging due to the difficulties of handling complex OSN topology, in existing models such as subjective logic, and the lack of effective validation methods. To address these challenges, we for the first time properly define trust propagation and...
Event-driven data aggregation (EDDA) scenario is widely applied in wireless sensor network (WSN) applications. In this paper, we present a MAC protocol of WSN for EDDA scenario, referred to as E-MAC. Different from other MAC protocols, E-MAC is designed upon the attributes of EDDA scenario. E-MAC classifies the nodes in EDDA scenario and divides the transportation of data packets into several stages...
Duty cycle MAC protocols achieve high energy efficiency and they are widely used in wireless sensor networks. However, they often suffer long end-to-end latency due to multi-hop sleep delay and are not suitable for industrial applications. RMAC, which employs multi-hop reservation mechanism, shows great advantage in reducing end-to-end latency than other duty cycle MAC protocols. However, due to interference...
In Wireless Sensor Network MAC protocol designs, end to end latency is a field that many researches often focus on. RMAC, as a synchronizing MAC protocol, shows great advantage in reducing end to end latency than other MAC protocols. However, the performance of RMAC degenerates when encountered with interference hotspots. In this paper, we present an enhanced MAC protocol called SRMAC, which is derived...
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