Service-based approaches (such as Web Services and the Open Grid Services Architecture) have gained considerable attention recently for supporting distributed application development in e-business and e-science. The emergence of a service-oriented view of hardware and software resources raises the question as to how database management systems and technologies can best be deployed or adapted fo...

Grid systems have evolved over time from traditional grid computing to service grids. Grid computing focuses on high perfomance computing, based on the concepts of cluster-building and resource sharing, by which grid systems are able to solve dataand comptutationally intensive tasks. Service grids include additionally virtualized, application field-specific services, providing for geographicall...

The development of modern science requires the equipment grid to provide a scientific collaboration research platform, which can realize remote collaboration and sharing with the key instruments and equipment in wide areas. The reliability and high efficiency of a grid service chain model are key points in creation of a grid equipment system. The π-calculus as powerful process algebra has a spe...

In this paper we present design and development of the grid workflow system based on the semantic grid services. We will highlight the process of the discovery and composition of grid and web services into workflows and semantic technologies supporting the users during the workflow composition and evaluation of the results [13]. We will describe in detail the challenges of the design and develo...

This paper gives a description of the portal user interface under development for the UK National Grid Service (NGS) by the Grid Technology Group at CCLRC Daresbury Laboratory. The first release of the NGS Portal was based on CHEF, the CompreHensive collaborativE Framework originally developed at the University of Michigan. A set of Grid-related tools has been successfully deployed to provide t...

Computational Grid allows customers to submit tasks to service providers. To maintain the availability, fairness and performance, it is critical to protect Computational Grid systems from malicious participants. Current solutions to this problem assume that the system would contain either malicious consumers only or malicious service provider only. However, in the real world, both consumers and...

Grid computing focuses traditionally on high perfomance computing, based on the concepts of cluster-building and resource sharing, by which grid systems are able to solve dataand comptutationally intensive tasks. Accordingly, typical applications include simulations in science, such as climate modeling. Over time, the scope of grid systems broadened in organizational and technical terms which l...

This paper introduces the way of separating the PROVE trace visualisation tool from the P-GRADE environment into a stand-alone Grid service. The separation resulted three PROVE implementations: a local service, a servlet based solution and an OGSA (Open Grid Services Architecture) enabled GT3 (Globus Toolkit) Grid service. The paper describes the problems and decisions during the development pr...

Distributed resource property repositories and state monitoring systems are critical components of any Grid Management Architecture, providing Grid scheduler, job/execution manager and state estimation components with accurate information about network, computational and storage resource properties and status. Without an upto-date information and monitoring service, intelligent scheduling decis...

This paper describes an implementation of a Grid Application Factory Service that is based on a component architecture that utilizes the emerging Web Services standards. The factory service is used by Grid clients to authenticate and authorize a user to configure and launch an instance of a distributed application. This helps us solve the problem of building reliable, scalable Grid applications...