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Crowdsourcing activities, carrying out large-scale tasks via wisdoms of crowds, are widely used in practice. However, it is hard for users to find tasks that are suitable for them. Thus, many users participate in tasks, and they are not good at or not interested in, and give answers carelessly or randomly. This phenomenon causes heavy astroturfing problem in crowdsourcing systems, which not only hurts...
MAC protocol is an important topic in Wireless Sensor Network, which plays a decisive role in network performance. The current MAC protocol has many problems such as highly dependent on time synchronization, low throughputs or data delay. With multi-channel allocation strategy, the paper put forward a dynamic route allocation algorithm, which reduced data delay and increased the throughputs. The simulation...
Mobile Ad hoc network is a multihop and provisional automous networks without support of infrastructure, which is composed of a group of mobile nodes with wireless transceiver. Based on MAODV, the paper proposes NMP-MAODV multicast routing protocol for the link disconnection problem caused by node moving so that the node is out of its upstream node's signal range. The protocol improves the packet...
In ABDM, revocation focus on how to revoke those delegated roles or permissions. Considering the characteristics of delegation operation in ABDM, this paper proposes two novel different revocations: revocation triggered by the change of user's delegation attribute expression and revocation triggered by the change of delegation permission's delegation attribute expression. In ABDM, these two revocations...
Multicast is the preferred transport mechanism for simultaneously transferring bulk data to multiple receivers. The differences between unicast and multicast, however, bring great challenges to congestion control for large-scale multicast. In this paper, a novel congestion scheme for reliable multicast, called active network based TCP-friendly congestion control, is proposed through introducing active...
In existing information systems, a delegation means a user who can assign his/her permissions to someone. In these information systems, however, the delegation security depends entirely on delegations and system administrators, for delegation constraint in delegation is only a prerequisite role. This paper proposes an Attribute-Based Delegation Model (ABDM) with an extended delegation condition consisting...
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