As a generalization of the traditional path protection (PP) scheme in WDM networks where a backup path is needed for each active path, the partial path protection (PPP) scheme uses a collection of backup paths to protect an active path, where each backup path in the collection protects one or more links on the active path such that every link on the active path is protected by one of the backup...

In order to realize high performance database systems, it is very much important to develop a method for high-speed backup as well as method to realize high-speed database operations. Although semiconductor memory is getting less expensive, disks are still important to realize reliable large database systems due to their characteristics; low cost, large capacity and nonvolatileness. If system d...

This paper discussed the characteristics of the self-built digital resources and the requirement for long-term preservation. A backup system for self-built digital resources has been proposed based on the software and hardware features of the resources. Furthermore, simple analysis has been carried out on the proposed system. Index Terms – self-built digital resource, backup system, long-term p...

Distributed hash tables have been proposed as a way to simplify the construction of large-scale distributed applications (e.g. [1, 6]). DHTs are completely decentralized systems that provide block storage on a changing collection of nodes spread throughout the Internet. Each block is identified by a unique key. DHTs spread the load of storing and serving blocks across all of the active nodes an...

We consider the following network design problem, that we call the Generalized Terminal Backup Problem: given a graph (or a hypergraph) G0 = (V,E0), a set of (at least 2) terminals T ⊆ V and a requirement r(t) for every t ∈ T , nd a multigraph G = (V,E) such that λG0+G(t, T − t) ≥ r(t) for any t ∈ T . In theminimum cost version the objective is to nd G minimizing the total cost c(E) = ∑ uv∈E c(...