Cloud computing is basically an internet based computing, whereby shared configurable resources are provided to cloud service consumers as services on demand. As an increasing growth of cloud computing, many enterprises provide different cloud services to cloud service consumers. From cloud service consumer's perspective, it is difficult to choose an appropriate cloud service that satisfies the...

The entry of low cost airlines has thrown out a challenge to all airlines to find ways of attracting passengers, through a mix of fare discounting, greater frequency, improved flight times and no-frill’s levels of on-board service. All of these competitive strategies have an impact on cost recovery. As airlines seek business in an increasingly heterogeneous passenger market, a greater understan...

This paper presents an innovative access control model, referred to as Web service Access Control Version 1 (Ws-AC1), specifically tailored to Web services. The most distinguishing features of this model are the flexible granularity in protection objects and negotiation capabilities. Under Ws-AC1, an authorization can be associated with a single service and can specify for which parameter value...

In the context of service-oriented architectures, quality attributes, such as loose coupling and autonomy, have been identified that services should fulfill. In order to influence services with regard to these quality attributes, an evaluation is necessary at an early development stage, i.e. during design time. Existing work mostly focuses on a textual description of desired quality attributes,...

In today’s scenario, most of the organizations provide the services through the web. This makes the web service an important research area. In addition, early design and building web services, it is necessary to concentrate on the quality of web services. Performance is an important quality attributes that to be considered during the designing of web services. The expected performance can be ac...

Customers often select service providers by trading three categories of service attributes: prices, service levels as measured by the response time to a service request, and all other intangible attributes. The purpose of this paper is to study the equilibrium behavior in a market with both smalland large-scale service providers that compete on both the price and service-level attributes. We fi...

We set the basis for a theory of testing for distributed transactions in service oriented systems where each service definition is decorated with a transactional attribute (inspired by the Java Transaction API). Transaction attributes discipline how services are executed with respect to the transactional scope of the invoking party. We define a language of observers and show that, in general, t...

We describe the Federation Semantic Attribute Mapping System (F-SAMS), a web services based system that automatically collects, in a trustworthy manner, the semantic mappings of Identity Provider (IdP) assigned attributes into a federation agreed set of standard attributes. The collected knowledge may be used by federation service providers (SPs) to support the dynamic management of IdPs and th...

The Quality of Service attributes of a software component heavily depend on its environment. For example, if a component uses a highly unreliable service, its own reliability is likely to decrease as well. This relation can be described with parametric contracts, which model the dependence between provided and required services of a component. Until now, parametric contracts can only model sing...

Building composite Web services can save significant time and cost for developing new applications and enhancing the interoperability and collaboration among E-business partners. This article proposes a framework for dynamic and personalized composition of Web services using an approach that integrates not only functional attributes of Web services, but also nonfunctional attributes such as ser...