In service oriented systems, Quality of Service (QoS) is a service selection driver. Users evaluate QoS at run time to address their service invocation to the most suitable provider. Thus, QoS has a direct impact on providers' revenues. However, QoS requirements are difficult to satisfy because of the high variability of Internet workloads. Workload variability cannot be accommodated with tradi...

During the last years, several approaches for the design of software services in service-oriented architectures (SOA) have been proposed. Often these approaches are too rough or too academic to provide guidance for real world SOA projects. Moreover, since the existing SOA design approaches are often not sufficiently validated, their successfulness in practice can be doubted. The research presen...

Since the beginning of the Service-Oriented Architecture (SOA) paradigm, with its various implementation technologies such as Web services, the focus of industrial communities has been on providing tools that would allow seamless and flexible application integration within and across enterprises’ boundaries. In this paper, the authors present a Context-based, Service-oriented Modeling and Analy...

Security is an important aspect of Service-oriented Architectures (SOAs), enabling the service-based integration of partner IT systems across organizational boundaries, i. e., in the Internet of Services. Current trends in SOA security, e. g., reducing it to Web service security, do not take into account SOA-specific threats, vulnerabilities, and attacks. In this paper, measures to support the ...

Component-oriented and service-oriented approaches have gained a strong enthusiasm in industries and academia with a particular interest for service-oriented approaches. The service concept and its use in web-based application development have a huge impact on reuse practices. Accordingly a considerable part of software architectures is influenced; these architectures are moving towards service...

Enterprise Architecture (EA) has undergone many changes since the IT has found its way into enterprises. At the moment the Service-Oriented Architecture (SOA) is being hyped but has also gained some importance. Implementing SOA can have many implications for an enterprise, depending on how visionary the implemented architecture is. This paper provides the description of an enterprise architectu...

This text describes some developments of an explosive growth in mobile traffic demand. The growth has led to market driven approaches and need for more effective spectrum access and management. Regulatory, technology and economic issues have led to innovative strategic approaches and policies for more effective spectrum usages. This text seeks factors and possibilities to influence spectrum sha...