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Reputation systems provide a promising way to build trust relationships between users in distributed cooperation systems, such as file sharing, streaming, distributed computing and social network, through which a user can distinguish good services or users from malicious ones and cooperate with them. However, most reputation models mainly focus on evaluating the qualities of different services in...
Similarity-based collaborative filtering systems are vulnerable to the data sparsity, cold-start, and robustness problems. Computational trust models are promising alternative solutions to alleviate these problems by replacing similarity metric with trust metric. However, they often have some shortages that rely on users' explicit trust statements. A fine-grained model computing trust from user ratings...
In order to manage the dynamic characteristics and provide theoretical foundation for modeling the grid services and services collaboration, by combining Object-Z with formal Statechart based on CREs (Concurrent Regular Expressions), this paper proposes an extension version of Object-Z language, GS-Z. As well, GS-Z extends Object-Z to enable the lifecycle management of grid service by introducing...
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