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In recent years, E-learning has been in a continuous development, due to the fact that it eases the process of teaching, evaluation and selfevaluation, offering schedulling flexibility and a tool support. E-learning makes learning content available even in remote locations, eliminating the need to travel to the place where the content is delivered. Nevertheless, the current E-learning platforms have...
RT-GRIS, our grid portal, has two purposes. One is effective CPU scavenging and other is supporting a great number of grid node. CPU-scavenging, cycle-scavenging, cycle stealing or shared computing creates a “grid” from the unused resources in a network of participants. It is an important technique for a distribution of grid job and node resource. And, if the grid portal uses fewer resources, those...
This paper analyses information on the electricity consumed by a site of an experimental Grid infrastructure and its correlations with users' resource reservation requests. The power consumption of all servers of this site was monitored for a period of six months, the data was gathered to enable studies on approaches for reducing the energy footprint of Grids and Clouds.
Resource discovery is an important aspect of computational Grid. Locating resources in a Grid environment is difficult because of the geographic dispersion and dynamic nature of its resources. In this paper, a center-distributed virtual community model is designed. Based on his model, a novel grid resource discovery method is presented. Its simulation experiment shows the present algorithm can solve...
The performance of remote paging on grids is strongly dominated by the network latency of data transfer. However, the memory clients in the previously proposed remote paging systems do not always put/get pages to/from the memory servers with the least network latency. Consequently, the communication cost of remote paging has not been reduced effectively. To address this problem, we propose an adaptively...
Geographically distributed computational infrastructures, based on the grid paradigm, are increasingly coming out of the research sphere where they originated, candidating themselves as a low-effort business solution for accessing and using vaste computating infrastructures, much larger than those small-medium enterprises can usually afford building ”in house”. In such scenario, accounting and billing...
Replica management has become a hot research topic in data grid, It improves the availability and fault tolerant of data in grid computing environment. Based on the deep research on the mainstream replica management technology in traditional data grid, we propose a dynamic replica management strategy. Our replica management strategy consists of the creation method of dynamic replica that can automatically...
BES is a large internationally collaborative experiment, which produces more than 1PB of data every year. To meet the requirements of data storage and analysis, the BESGrid project has been launched. Data management is a very important part of BESGrid, and we designed and developed a large scale data management system. The system is responsible for storing a large amount of data, providing high-performance...
This paper presents the various mechanisms for virtual machine image distribution within a large batch farm and between sites that offer cloud computing services. The work is presented within the context of the Large Hadron Collider Computing Grid (LCG), it has two main goals. First it aims at presenting the CERN specific mechanisms that have been put in place to test the pre-staging of virtual machine...
This paper introduces the User-level Remote Swap Library, URSL, which enables memory-homogeneous Grid execution. This is obtained by letting the Grid infrastructure supply a remote memory bank to the connected resources. Insufficient memory at the contribution computer resource in a Grid is a major limitation when users seek to get high throughput in a Grid infrastructure, simply because a number...
In a volunteer-based Grid, the system must be heterogeneous, and the computation capability of each node varies, and load distribution or load balancing is one of the most important issues in Grid. Some techniques have been proposed for dynamic load distribution which relocates jobs, by migrating running jobs keeping their execution states, from a high-loaded node to a lower-loaded node during execution...
Formerly computer application development just develops in one computer with one application, if one user wants to use some application in other computer (e.g. a computer or device) then the computer or device must be deployed or reinstalled the application in another computer. As a result, due to improve this problem, many application developer start redesign or translate elder application as Web...
Environmental applications play an important role in the modern society due to the accuracy and the quality of the services they provide (weather forecast, meteorological or temperature prediction). The complexity of these applications makes them very hard to implement in a general, but still easy to use framework. Because of the large volume of processing data, most of the environmental models must...
Data are special kinds of resource in grid, and their flow, management and uniform view play an important role in the grid system. This paper presents a dynamic adaptive data transfer model based on multiple replicas in the grid environment, compared with the traditional data transfer method based on single replica, the experimental results show that this model has a better transfer performance.
In dynamic grid environment, distribute a large number of different types of services and resources. F fast and accurate resource and service discovery, this article proposes a new structured Gossip messages spread algorithm, called S-Gossip, this algorithm has good redundancy and completeness. We describes in detail the implementation of the algorithm and protocol, and on this basis, the establishment...
Current computing platforms become more and more complex for users to use. To simplify configuration and deployment of applications on these infrastructures tools are necessary. Current deployment tools lack of maturity for large-scale deployment. For example a grid environment leads to a great diversity. Deploying an application on a grid from a single centralized machine is not adapt. So, decentralization...
The COMETA e-Infrastructure running in Sicily is compliant with the EGEE middleware and specifications offering a great computing power and huge storage capacity. Since its beginning one of the main goals has been to extend the adoption of Grid paradigm from the academic to business world. Several software and hardware extensions have been implemented in order to enhance the infrastructure performances;...
The Authorization Management in Grid Systems has various structures. This paper proposes an identity-based authorization mechanism which using IBE algorithm for key exchanging and PMI for policy decision. Our scheme could satisfy the demands of the process from access requests committed by users to the authorized access control. The security level of the scheme is lower than the systems based-certificates...
This paper proposes an intelligent learning management system with load-balancing function based on Grid structure that allows for the replication of learning materials and balance of network traffic. The system consists of the Learning Management System (LMS) for processing basic data, learning data and learning records of learners, and the Learning Content Management Systems (LCMS) based on the...
Combined with the grid development, this article analyzed the current widespread adoption of authentication mechanisms and researched GSI program and KX.509 program in different grid environment. With the proxy idea of KX.509, using and implementing a Web-login module to build the grid authentication model in the Globus environment. The module provides the transparent user certificate generation,...
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