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Peer-to-peer information systems have gained prominence of late with applications such as file sharing systems and grid computing. However, the information retrieval component of these systems is still limited because traditional techniques for searching and ranking are not directly applicable. This work compares search in peer-to-peer information systems to that in metasearch engines, and desc...

In view of the theoretical and empirical support for the use of student-generated questions in education and the numerous useful features of network technology, several online student question-generation learning systems with peer-assessment components have been developed. Since most of the similar existing systems were limited in terms of the types of communication modes used in peer-assessmen...

Recent peer-to-peer research has focused on providing efficient hash lookup systems that can be used to build more complex systems. These systems have good properties when their algorithms are executed correctly but have not generally considered how to handle misbehaving nodes. This paper looks at what sorts of security problems are inherent in large peerto-peer systems based on distributed has...

There is an increased interest, by content creators and owners, in content protection systems that provide the ability to control or restrict the content that can be shared on peer-to-peer file sharing systems. Some content protection systems have been proposed for centralized peer-to-peer systems (such as Napster) where a central authority controls all indexing and querying. These systems cann...

Data from the United Nations and the International Civil Aviation Organization Information Systems were used as a base for characterizing, classifying and comparing air transport demand and supply features of 156 countries. Relevant data from 1980 were chosen to reflect five sets of characteristics namely, air transport, 50cm-economic status, population demography, geographical and environmenta...