With the prevalence of Service-Oriented Architecture (SOA), end-users, who are not familiar with SOA standards and tools, want to customize services to fulfill their daily activities. However, it is challenging for end-users to get involved in the service composition, due to the in-depth knowledge needed for SOA standards and techniques. To help end-users compose services for their daily activi...

With the growth of the Internet-of-Things and online Web services, more services with more capabilities are available to us. The ability to generate new, more useful services from existing ones has been the focus of much research for over a decade. The goal is, given a specification of the behavior of the target service, to build a controller, known as an orchestrator, that uses existing servic...

One of the main technical challenges of the pervasive computing is the ability to build applications with the capacity to adapt themselves to their environment. In this paper, we present an open architecture facilitating the development of home services. Context dynamicity and service ambiguity are dynamically managed by smart composing elements. The architecture is applied and tested in an att...

Data as a Service (DaaS) builds on service-oriented technologies to enable fast access to data resources on the Web. However, this paradigm raises several new privacy concerns that traditional privacy models do not handle. In addition, DaaS composition may reveal privacysensitive information. In this paper, we propose a formal privacy model in order to extend DaaS descriptions with privacy capa...

In this overview paper, we discuss the basic principles underlying service-oriented computing in general, and (Web) services in particular. We discuss the important differences between (Web) services and Web applications and other models in Internet computing. Finally, we discuss where we see the future research challenges in the area of service composition. Zusammenfassung In diesem Übersichts...

We use a distributed, enriched λ-calculus for describing networks of services. Both services and their clients can protect themselves, by imposing security constraints on each other’s behaviour. Then, service interaction results in a call-by-property mechanism, that matches the client requests with service’s. A static approach is also described, that determines how to compose services while gua...

Service-oriented architecture (SOA) is focused on building loosely coupled distributed systems with minimal shared understanding among system components. The main building blocks in SOA are services. Services are selfdescriptive, self-contained, platform-independent and openly-available components that interact over the network. The main goal of SOA is transparent, flexible and dynamic interact...

Software as a Service (SaaS) has become the new paradigm in software development. Ecosystems of Web Services can be flexibly and dynamically composed to suit user specific needs. Quality is essential to the success of service based applications. The process of service composition has a major impact on the quality of the final product. We propose a dynamic and flexible Quality of Service Composi...

Web services are emerging as a promising technology for the development of next generation distributed heterogeneous software systems. Some prominent challenges for Web services are the discovery of services which match some given requirements, the composition of services into new complex applications, and the safe replacement of (sub)services. The primary objective of this thesis is to define ...