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By Aidong Zhang, Avi Silberschatz, Sharad Mehrotra

Continuous Media Databases brings jointly in a single position vital contributions and updated examine ends up in this fast paced region.
Continuous Media Databases serves as a great reference, offering perception into one of the most demanding study matters within the field.

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Until 1994 he was leading a department in the Integrated Publication and Information Systems Institute (lPSI) of the National Research Center for Information Technology (GMD) in Darmstadt. From 1994 to 1998 he was an Assistant Professor in the Department of Computer Science ofthe University of the Saarland at Saarbruecken, Germany. Dr. Muth's research interests include parallel and distributed information systems, multimedia information systems and workflow management. Michael Paterakis received his Diploma degree from the National Technical University of Athens.

To prevent the system from oscillating between replication and de-replication, a de-replication threshold, D > 0, is introduced to impose a margin between the triggering threshold for replication and that for de-replication. ) 4. Experiments Simulations are carried out to compare the performance of the different policies 10 proposed in Section 3. The performance metrics under study are the acceptance rate and the movie replication time. Beside evaluating the performance of the propose algorithms, we also try to answer the following questions.

In our study, we choose a target node from the following set St: St = {x I where xfj. Ri(t) and Lx(t) < ~< } (3) Three target node selection policies are studied in this paper. All of them choose a node from the set of lightly-loaded nodes which do not contain a copy of the movie being replicated: (1) Randomly choose a node from the set St. (2) Choose the least-loaded node. Mathematically, we choose the node from the set where Sr' = {x I where xESt and Lx(t) = max{B yYES, 36 Ly(t)}} S/ (4) THRESHOLD-BASED DYNAMIC REPLICATION 41 Note that this policy suffers from a problem of competition for service capacity by multiple movies.

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