To accommodate applications with highly variable degrees and categories of Quality of Service (QoS) requirements, a major effort has been invested to overcome the traditional best-effort service quality of the Internet [1],[2]. Nevertheless, there has been a shift towards weak QoSassurance paradigms based on the differentiation of different QoS levels [3]. What is currently missing is a techniq...

Internet service providers usually express the quality of network services through a set of values determined according to several network performance parameters periodically collected or measured. However, for common end-users, these values do not give an overall idea of the quality of the network services as they stand for different units and evaluate different perspectives of each service qu...

Service level agreement (SLA) is a powerful tool to formalize the negotiation and agreement between the service provider and service seeker with the scope of service quality characteristics, compensations and tariffs. The service quality description is the main part of a SLA which can be characterized by the use of suitable and feasible quality of service (QoS) parameters. Determining suitable ...

Zusammenfassung In Serviceorientierten Architekturen können Geschäftsprozesse durch Komposition von lose gekoppelten Services realisiert werden. Sind entsprechende Services auf Service-Marktplätzen vorhanden, kann ein Service-Konsument zwischen Services wählen, die die von ihm benötigte Funktionalität bereitstellen, basierend auf deren Dienstgüte (engl.: Quality of Service – QoS). Diese QoS-bas...

Distributed multimedia applications such as Video-On-Demand (VOD) will need user-friendly graphical interfaces to specify and control compressed continuous media and their service behavior according to the quality perceived by the human user. This requires a new extension of the Quality of Service (QoS) concept to incorporate the perceptual quality. In this paper, we investigate services for su...

This paper describes a software mechanism, called quality events, that utilizes applicationand/or system-level service extensions to provide quality of service (QoS) guarantees to end users. Such extensions offer flexibility in: (1) how applicationand/or system-level services are dynamically managed to maintain required quality, (2) when such management occurs, and (3) where this service manage...

abstract in recent decade, the research regarding wireless applications in e-health services has increased. simple communications, fast delivery of medical information, reducing treatment cost and reducing the medical workers error rate, are the main benefits of using wireless technologies in e-health applications. but on the other hand using wireless technologies causes the electromagnetic int...

Quality of Service (QoS) has become an increasingly important concept in wide-area distributed systems. The overall QoS characteristics of a wide-area distributed system are influenced by the QoS of the individual hosts involved and the QoS of the communication subsystem connecting these hosts. In this paper, we include a general presentation of wide-area computing and Quality of Service concep...