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Unpredictable node mobility, low node density, and lack of global information make it challenging to achieve effective data forwarding in Delay-Tolerant Networks (DTNs). Most of the current data forwarding schemes choose the nodes with the best cumulative capability of contacting others as relays to carry and forward data, but these nodes may not be the best relay choices within a short time period...
Opportunistic mobile networks consist of personal mobile devices which are intermittently connected with each other. Data access can be provided to these devices via cooperative caching without support from the cellular network infrastructure, but only limited research has been done on maintaining the freshness of cached data which may be refreshed periodically and is subject to expiration. In this...
The recent popularization of hand-held mobile devices, such as smartphones, enables the inter-connectivity among mobile users without the support of Internet infrastructure. When mobile users move and contact each other opportunistically, they form a Delay Tolerant Network (DTN), which can be exploited to share data among them. Data replication is one of the common techniques for such data sharing...
Disruption Tolerant Networks (DTNs) are characterized by low node density, unpredictable node mobility and lack of global network information. Most of the current research efforts in DTNs focus on data forwarding, but only limited work has examined the problem of providing effective access of fused information to mobile users. In this paper, we examine a QoI metric — provenance (“to come from”) —...
Effective data forwarding in Delay Tolerant Networks (DTNs) is challenging, due to the low node density, unpredictable node mobility and lack of global information in such networks. Most of the current data forwarding schemes choose the nodes with the best cumulative capability of contacting others as relays to carry and forward data, but these nodes may not be the best relay choices within a short...
By analyzing existed improved DHT networks, we propose a novel improved CAN: PPCAN, which adopt 2-dimensional Polar coordinate and power series expand subspace hops to obtain better routing efficiency and lower maintenance cost. Then, we introduce the Landmarks to optimize the relay sequenced peers through the hops. Our design can be implemented entirely at the application level. Some improved routing...
In order to resolve the trust problem due to the opening, the dynamics, the anonymity, and the uncertainty of system, this paper proposes a new trust model by analyzing and improving the subjective logic. A new trust quantification formula with the negative-event and time effects is introduced, and a definition of risk is also presented. We can evaluate the trust relationships between peers more precisely...
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