Web Services are mounting as an inventive mechanism for rendering services to subjective devices over the WWW. As a consequence of the rapid growth of Web Services applications and the plenty of Service Providers, the consumer is facing with the inevitability of selecting the “right” Service Provider. In such a scenario the Quality of Service (QoS) serves as a target to differentiate Service Pr...

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...

Cloud computing is an Internet-based computing model. This model enables access to resources and services on demand. Cloud computing users have applications with different Quality of Service requirements. On the other hand, there are different cloud service providers offering services with different qualitative characteristics. Determining the best cloud computing service for a specific applica...

Cloud computing is an Internet-based computing model. This model enables access to resources and services on demand. Cloud computing users have applications with different Quality of Service requirements. On the other hand, there are different cloud service providers offering services with different qualitative characteristics. Determining the best cloud computing service for a specific applica...

Abstract Data portability regulation has promised that individuals will be easily able to transfer their personal data between online service providers. Yet, after more than two years of an active privacy regime in the European Union, this promise is far from being fulfilled. Given lack a functioning infrastructure for direct multiple providers, we investigate our study how individual could cur...

Cloud is an emerging technology where the providers provide various services to Information Technology by adopting the concept of service oriented architecture, distributed, autonomic, and utility computing. In the present competitive world, building a highly dependable cloud application and opting for the optimal fault tolerant technique for cloud components has become crucial. In this paper, ...

Annually, web search engine providers spend more and more money on documents ranking in search engines result pages (SERP). Click models provide advantageous information for ranking documents in SERPs through modeling interactions among users and search engines. Here, three modules are employed to create a hybrid click model; the first module is a PGM-based click model, the second module in a d...

Cloud computing is a recent computing paradigm that represents a fundamental change of information commu- nication technology (ICT) services and Cloud services continue to grow rapidly with increasing functionality and more users. As a result of this growth, it is a critical issue to select a suitable Cloud service which meets all the business strategies and the objectives of firms. This paper ...

Cloud computing is a recent computing paradigm that represents a fundamental change of information commu- nication technology (ICT) services and Cloud services continue to grow rapidly with increasing functionality and more users. As a result of this growth, it is a critical issue to select a suitable Cloud service which meets all the business strategies and the objectives of firms. This paper ...

Nowadays, to take advantage of tags is a general tendency when users need to store or retrieve images on the Web. In this article, we introduce some approaches to calculate semantic importance of tags attached to Web images, and to make re-ranking the retrieved images according to them. We have compared the results from image re-ranking with two semantic providers, WordNet and Wikipedia. With t...