End User Oriented Ad Hoc Web Services Composition in a Scienti fi c Application Portal Architecture

Web services technologies provide e-Business a way to automate and streamline distributed business processes. They are also emerging as a new approach for supporting e-Science by providing access to heterogeneous computation resources and integration of distributed scientific applications. In this paper, we present a scientific application portal architecture that enables end users to compose a new scientific task by integrating a set of high level web services provided by portal developers. It is also intended to provide end users high quality computation services by choosing an optimal computing resource. The portal design demonstrates that the flexibility, reusability and interoperability can be provided for both end users and portal developers by using web services technologies.