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In a number of scenarios, services generated using a model-driven development (MDD) approach could benefit from ??reflective?? access to the information in the models from which they have been generated. Examples are monitoring, auditing, reporting, and business intelligence scenarios. Some of the information contained in the models of a service can statically be generated into its source code. In...
In this paper, we address the problem of self-adaptation in internet-scale service-oriented systems. Services need to adapt by selecting the best neighboring services solely based on local, limited information. In such complex systems, the global significance of the various selection parameters dynamically changes. We introduce a novel metric measuring the distribution and potential impact of service...
Complex service-oriented systems comprise humans and software services spanning multiple organizations. These systems are highly dynamic, because services, processes, and teams are not only diverse but they also constantly evolve. Therefore, these systems introduce a variety of challenges on how to adapt services, processes, and teams to changing situations. We contribute with our approach to address...
A simple and effective composition of software services into higher-level composite services is still a very challenging task. Especially in enterprise environments, quality of service (QoS) concerns play a major role when building software systems following the service-oriented architecture (SOA) paradigm. Inthis paper we present a composition approach based on a domain-specific language(DSL) for...
Many collaboration platforms are realized as service-oriented systems enabling flexible compositions of services and support of interactions. Interactions between entities in such systems do not only span software services, but also human actors. A mixed service-oriented system is therefore composed of human and software services. In open environments, interactions between people and services are...
In general, provenance of electronic data represents an important issue in information systems. So far, service-oriented computing research has mainly focused on provenance of data. However, service provenance also plays a central role since service providers and consumers want to be aware of the service's origin and history. In this paper, we present an approach for service provenance that builds...
Networked enterprises create virtual teams of distributed experts belonging to different enterprises where one user can be part of multiple teams; How to effectively control the sharing of personal and shared context information among members of multiple overlapping teams without compromising their privacy is a challenging research question. This paper describes sharing control in Peer to Peer and...
Embedded systems are specialized computers used in larger systems or machines to control equipments such as automobiles, home appliances, communication, control and office machines. Such pervasivity is particularly evident in immersive realities, i.e., scenarios in which invisible embedded systems need to continuously interact with human users, in order to provide continuous sensed information and...
Distributed and mobile collaboration technologies continue to play an important role in supporting complex, flexible and interconnected collaborations within networked enterprises and e-science. The latest trends in distributed and mobile collaboration technologies allow people to work across organizational boundaries, to collaborate among/in organizations and communities and to be part of the collaborative...
Summary form only given. Today's complex service-oriented systems comprise humans and software services spanning multiple organizations. These systems are highly dynamic because not only services, processes and teams are diverse but also they constantly evolve. Therefore, these systems introduce many challenges on how to adapt services, processes and teams to changing situations. In this keynote talk,...
Sensing context information and making it available to the people, involved in coordinating a collaborative task, is a preliminary phase in making a system adaptable to the prevailing situation in pervasive environments. However, the diversity of the sources of context information, the characteristics of pervasive environments, and the nature of collaborative tasks pose a stern challenge to the efficient...
Governing business compliance with regulations, laws, best practices, contracts, and the like is not an easy task, and so far there are only limited software products available that help a company to express compliance rules and to analyze its compliance state. We argue that todaypsilas SOA-based way of implementing and conducting business (e.g., using Web services and business process engines) lends...
Context-awareness has become a desired key feature of today's mobile systems, yet, its realization still remains a challenge. On the one hand, mobile computing provides great potential for adaptations based on sensed contextual information. On the other hand, the lack of dependability in mobile networks hampers an efficient provision of this information to requesting clients. In this paper we present...
The wide diffusion of reliable Internet is pushing two key novelties in the conception of modern software applications: the software as a service paradigm and the idea of the Internet of Things. Traditionally, services and things have been considered as separate entities, even addressing different needs and application domains. In contrast, we feel that services and things should be integrated and...
Many service-oriented business systems have to comply to various contracts and agreements. Multiple technical and non-technical stakeholders with different background and knowledge are involved in modeling such business concerns. In many cases, these concerns are only encoded in the technical models and implementations of the systems, making it hard for non-technical stakeholders to get involved in...
Software as a Service (SaaS) and the possibility to compose Web services provisioned over the Internet are important assets for a service-oriented architecture (SOA). However, the complexity and time for developing and provisioning a composite service is very high and it is generally an error-prone task. In this paper we address these issues by describing a semi-automated "Composition as a Service''...
Systems based on the service-oriented architecture (SOA) paradigm must be able to bind to arbitrary Web services at runtime. However, current service frameworks are predominantly used through precompiled service-access components, which are invariably hard-wired to a specific service provider. The Dynamic and Asynchronous Invocation of Services framework is a message-based service framework that supports...
In novel market-oriented resource sharing models, resource consumers pay for the resource usage and expect that non-functional requirements for the application execution, termed as quality of service (QoS), are satisfied. QoS is negotiated between two parties following the specific negotiation protocols and is recorded using service level agreements (SLAs). However, most of the existing work assumes...
The vision of the Scientific Web is to enable research scientists to collaborate in a ubiquitous manner; sharing resources, data, and insights how to perform experiments. The grid provides the underlying computing infrastructure, thereby enabling workload sharing and distribution of computational tasks among millions of nodes. However, current collaboration tools in scientific grid environments do...
Novel forms of collaboration increasingly distribute control among e-workers, thereby allowing agile and autonomous collaboration. However, this requires a novel blend of infrastructure and algorithms for self-adaptation of collaboration services. We present VieCAR (Vienna Collaborative Activity and Resource Management Framework), a framework that addresses the requirements of new collaborative service-oriented...
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