In this paper we present a scalable, integrated and service-oriented collaboration system, namely Global Multimedia Collaboration System, based on the XGSP collaboration framework and NaradaBrokering messaging middleware. This system can provide videoconferencing services to heterogeneous endpoints such as H.323, SIP, Access Grid, RealPlayer as well as cellular phone. This paper discusses the d...

In this paper, it combines the dynamic nature of grid services with the capabilities alternative of real-time transactions. First of all, the grid real-time transaction model based on function equivalent service is defined .The model supports the joint implementation by a number of function equivalent services which own the same transaction, and allows grid services to join or exit the transact...

This paper presents a new approach to scheduling jobs on a service Grid using a genetic algorithm (GA). A fitness function is defined to minimize the average execution time of scheduling N jobs to M(≤ N) machines on the Grid. Two models are proposed to predict the execution time of a single job or multiple jobs on each machine with varied system load. The single service type model is used to sc...

Nowadays the grid is turning into a service-oriented environment. In this context, there exist solutions to the execution of workflows and most of them are web-service based. Additionally, services are considered to exist on a fixed host, limiting the resource alternatives when scheduling the workflow tasks. In this paper we address the problem of dynamic instantiation of grid services to sched...

Middleware technologies is a very big field, containing a strong already done research as well as the currently running research to confirm already done research’s results and the to have some new solution by theoretical as well as the experimental (practical) way. This document has been produced by Zeeshan Ahmed (Student: Connectivity Software Technologies Blekinge Institute of Technologies). ...

Computational grids are heterogeneous, dynamic and distributed environments that enable large-scale sharing of resources within groups of individuals and/or institutions [9]. A grid environment collects a lot of information and information itself is a critical resource in computational grids, so it is necessary to well administrate it. A fundamental element in a grid infrastructure is the Infor...

Grids can be classified as computational grids, access grids and data grids. Computational grids address applications that deal with complex and time intensive computational problems, usually on relatively small datasets. Access grids focus on group-to-group communication. Whereas data grids address the needs of applications that deal with the evaluation and mining of large amounts of data in t...

Who will be the grid users of tomorrow? We propose a categorisation of ‘future grid’ users into the following categories: Service End-User, Power User (with three distinct sub-types), Service Provider and Infrastructure Sysadmin. A further basic type could be argued as Third Party Beneficiary. This paper outlines the possible characteristics of these ‘types’ of users. For users that have layers...

This paper reports on the progress made to date with the establishment of the National Grid Service, the core of which is based on the nodes recently acquired from funding allocated by the JCSR and CCLRC. Following the analysis of users’ initial requirements, the UK e-Science Grid was set up through the collaborative efforts of the four involved sites and the HPC(x) and CSAR services using the ...

Taking advantage of the application paradigm of web service, a general paradigm of service computing is discussed for underlying workflow execution based on collaborative operation. In line with the scenario of service computing, a certificate-driven workflow application paradigm based on service computing is discussed under grid environment in form of virtual organization. The details engaged ...