Numerous replica placement algorithms have been proposed in the literature for use in content delivery networks. However, little has been done to compare the various placement algorithms against each other and against caching. This paper debates whether we need replica placement algorithms in content delivery networks or not. The paper uses extensive evaluation of algorithms, systems and web wo...

Power conservation and extending survival time are critical issues in mobile ad hoc networks, as the nodes are powered by battery only. In this paper, according to the mobility of nodes, the survival-time-based adaptive replica allocation algorithm is proposed. In the survival-time-based dynamic adaptive replica allocation algorithm, based on the locality of data access, the replica allocation ...

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In this Letter we study the NP-complete vertex cover problem on finite connectivity random graphs. When the allowed size of the cover set is decreased, a discontinuous transition in solvability and typical-case complexity occurs. This transition is characterized by means of exact numerical simulations as well as by analytical replica calculations. The replica symmetric phase diagram is in excel...

A novel area-efficient dual replica-bitline delay technique is proposed in this brief to improve process-variation-tolerance of low voltage SRAM application. This strategy suppresses the timing variation by adding one another replica-bitline and introducing novel replica cell which has the same size as conventional. Simulation results in TSMC 65nm LP technology show that more than 32.3% timing ...

In these lectures I will study some properties that are shared by many glassy systems. I will shown how some of these properties can be understood in the framework of the mean field approach based on the replica method and I will discuss which are the difficulties which we have to face when we apply the replica method to realistic short range models. We finally present a partially successfully ...

In these lectures I will study some properties that are shared by many glassy systems. I will shown how some of these properties can be understood in the framework of the mean eld approach based on the replica method and I will discuss which are the diiculties which we have to face when we apply the replica method to realistic short range models. We nally present a partially successfully applic...

Grid Replica systems are gaining foothold in real end user systems, and are used in an increasing number of large scale projects. As such, many of the properties of these systems are well understood. This paper how to handle some minor shortcomings of todays data replica systems, in respect to consistency management, and to their ability to handle derived data sets. We think that both features ...

We investigate the connection between the well known SherringtonKirkpatrick Ising Spin Glass and the correspondent Lattice Gas model by analyzing the relation between their thermodynamical functions. We present results of replica approach in the Replica Symmetric approximation and discuss its stability as a function of temperature and external source. Next we examine the effects of first order ...