Since the internet network's establishment, World Wide Web is considered as most important tool used by billions of people across world. It allows to share media, read, write, publish and interact with others via internet. its advent, has evolved from a read-only medium technological network collaborative one where learners are interlinked in various ways. Through stages evolution, English lang...

In this paper the design and implementation of fault tolerable architecture for scientific workflow engines is presented. The engines are assumed to be implemented as composite web services. Current architectures for workflow engines do not make any considerations for substituting faulty web services with correct ones at run time. The difficulty is to rollback the execution state of the workflo...

World Wide Web is growing at a very fast pace and makes a lot of information available to the public. Search engines used conventional methods to retrieve information on the Web; however, the search results of these engines are still able to be refined and their accuracy is not high enough. One of the methods for web mining is evolutionary algorithms which search according to the user interests...

purpose: the aim of the present research is generally to evaluate the use of the creativity dimensions and components in iran national library website from its users’ point of view. method: we used survey method. research population was composed of 19665 users and 173 librarians of the national library & archives of iran (nlai). the data collecting tool was a questionnaire which was designed by...

In this paper the design and implementation of fault tolerable architecture for scientific workflow engines is presented. The engines are assumed to be implemented as composite web services. Current architectures for workflow engines do not make any considerations for substituting faulty web services with correct ones at run time. The difficulty is to rollback the execution state of the workflo...

Despite significant advances in the access control domain, requirements of new computational environments like web services still raise new challenges. Lack of appropriate method for specification of access control policies (ACPs), composition, verification and analysis of them have all made the access control in the composition of web services a complicated problem. In this paper, a new indepe...