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Keywords: Multi-agent systems Multiple virtual organizations Overlapping coalition formation Discrete particle swarm optimization Two-dimensional binary encoding Resource conflict Encoding repair a b s t r a c t Coalition formation is an active and essential component for multi-agent systems (MAS) in task-oriented domains in which tasks can be too(More)
H.264 is the new Video Encoding World Standard, how to guarantee its security is an urgent problem. In this paper a new video encryption algorithm for H.264 is proposed, which utilized scrambling of intra-prediction, inter-prediction mode and encryption of transform result, motion vector. The results show that the proposed method exhibits nice security, has(More)
—Video encryption is becoming increasingly important as multimedia applications gain more and more popularity. With a focus on the widely-used H.264 video coding standard, various encryption algorithms based on the intra prediction mode have been developed while suffering limited scrambling space and inadequate security. In this paper, the existing(More)
Speech encryption is becoming increasingly important as the increasing relevance of multimedia applications such as video conference and news broadcasting. However, multimedia encryption and decryption are often computationally demanding and unpractical for power-constrained devices and narrow bandwidth environments. It is a challenge to obtain a good(More)
Speech encryption is becoming increasingly important as the increasing relevance of multimedia applications such as video conference and news broadcasting. However, multimedia encryption and decryption are often computationally demanding and unpractical for power-constrained devices and narrow bandwidth environments. To tackle this situation, two novel(More)
Coalitional Resource Games (CRGs) are a natural and formal framework in which agents wish to form coalitions to pool their scarce resources in order to achieve a set of goals that satisfy all members of a coalition. Thus far, many computational questions surrounding CRGs have been studied, but to our knowledge, a number of natural decision problems in CRGs(More)
In multi-agent systems, agents are inclined to form coalitions to improve individual performance and perform tasks more efficiently. However, the most existing researches assume that the desired outcome is a coalition structure that consists of disjoint coalitions where every agent that has joined a coalition is no longer available to join other coalitions,(More)