Abstract. The increasing number of functionally similar services requires the existence of a non-functional properties selection process based on the Quality of Service (QoS). Thus, in this article, authors focus on the provision of a QoS model, an architecture and an implementation which enhance the selection process by the annotation of Service Level Agreement (SLA) templates with semantic QoS metrics. This QoS model is composed by a specification for annotating SLA templates files, a QoS conceptual model formed as a QoS ontology and selection algorithm. This approach, which is backward compatible, provides interoperability among customer-providers and a lightweight alternative. Finally, its applicability and benefits are shown by using examples of Infrastructure services.
Abstract-The evolution of services market raises the need for automatic support for negotiating service use criteria. In order to reach an agreement, the negotiating parties need to develop a common understanding of the Quality of Service (QoS) terms which are part of the Service Level Agreement (SLA). The use of semantic annotations together with reasoning can increase the level of flexibility and automation in SLA management. A framework is presented for SLA negotiation allowing the two parties to use their own terminologies.
Abstract. The increasing number of infrastructure services requires the existence of mechanisms to discover and select services and resources, called service broker, based on customer requirements. This mechanism should improve the interoperability among customer-provider and be a backward compatible and light weight approach. The introduction of semantic annotations in service description (both functional and nonfunctional properties) as well as a conceptual model for business Grid can help to achieve them. Finally, the extension of the semantic Open Grid Service Architecture (S-OGSA) with the incorporation of the semantic service broker can incorporate the required capabilities to the Grid middleware.
Addressing the requirements of academic end users, the Grid paradigm and its underlying technologies was in past developed and evolved neglecting the needs of potential business end users. Nowadays the trend changed towards the use of Grid technologies within electronic business (e-Business) which at the same time requires adapting existing technologies to allow for more flexible, intelligent and reliable support for business stakeholders. The BREIN project was the first one integrating two so far parallel evolving domains into the Grid, namely multi-agent and semantics. By this, the Grid was enhanced to provide the requested capabilities from business end users. This chapter will show the rationale behind the performed developments and the way how BREIN addresses its four main objectives of enabling and/or enhancing: (i) Autonomy and Automation, (ii) Self-Optimization, (iii) Context-Aware Security, (iv) Reduced Complexity of Use with a dedicated focus on the major pillars of the framework, Virtual Organizations (VOs) and Service Level Agreements (SLAs). With that, a generic solution is presented, which can be applied to a variety of distinct application areas.
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