Community mining is applied in order to identify groups of users which share, e.g., common interests or expertise. This paper presents an approach for mining descriptive patterns in order to characterize communities in terms of their distinctive features: For an efficient discovery approach, we introduce optimistic estimates for obtaining an upper bound for the community quality. We present an ...

In this paper, it is assumed that the “Decision Making Units“( ) are consist of positive and negative input and output. Firstly, the optimistic and pessimistic models have been suggested by using negative data and then units with most productive scale size are measured in optimistic and pessimistic models. These productive values are compared with double frontiers and Hurwicz’s Criterion to obt...

Optimistic synchronization is a method of synchronizing parallel and distributed computations without the use of blocking. When non-optimistic systems would block, optimistic synchronization mechanisms permit operations to go ahead. If such optimism causes improper synchronization, the mis-synchronized work is undone and the entire system restored to a consistent state. This paper discusses the...

A collaborative object represents a data type (such as a text document) designed to be shared by a group of dispersed users. The Operational Transformation (OT) is a coordination approach used for supporting optimistic replication for these objects. It allows the users to concurrently update the shared data and exchange their updates in any order since the convergence of all replicas, i.e. the ...

optimistic replicltion is m imparrrnt technique for achieving high avdability in distributed file systans. A key problem m optimistic rephtim is using d c b w l e d g e of objects to resolve co"mt updates from multiple partitions. In this paper, we describe how the Coda File System resolves pllrtitionsd updareg to updates is a simple yet efficient and powerful teclmique for directory resolution...

Optimistic replication is often viewed as essential for large scale systems and for supporting mobile computing. In optimistic replication, updates can be made concurrently to diierent le replicas, resulting in multiple versions of the le. To recover from these connicting updates, after-the fact connict resolution actions are required to recombine multiple versions into one. This paper deenes t...