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...

By definition, web-services composition works on developing merely optimum coordination among a number of available web-services to provide a new composed web-service intended to satisfy some users requirements for which a single web service is not (good) enough. In this article, the formulation of the automatic web-services composition is proposed as several set-cover problems and an approxima...

Modern web services such as social media, online messaging, and search support billions of users, requiring data centers that scale to hundreds thousands servers, i.e., hyperscale. The key challenge in enabling hyperscale arise from (1) an unprecedented growth data, service functionality (2) a decline hardware performance scaling. We highlight dissertation’s contributions bridging the software ...

introduction: in the age of information, in order for offering integrated library services to the users, librarians need to be knowledgable about new web technologies and their applications in library services, especially in medical areas.  this study investigates the level of knowledge and and usage of world wide web in library services among medical librarians in tehran. methods: the present ...