In order to provide various services with different quality requirements, the current Internet is expected to turn into a QoS based Internet under the Differentiated Service (DiffServ) architecture. A variety of works have been done in the field of constraint based routing to provide QoS guaranteed or assured services by developing novel routing protocols and algorithms. However, most of these ...

Quality of Service mechanisms and differentiated service classes are increasingly available in networks and servers. While network clients can assess their service by measuring basic performance parameters such as packet loss and delay, such measurements do not expose the network’s core QoS functionality. In this paper, we develop a framework and methodology for enabling network clients to asse...

The issue of mobility is important in wireless network because internet connectivity can only be effective if it’s available during the movement of node. To enhance mobility, wireless access systems are designed such as IEEE 802.16e to operate on the move without any disruption of services. In this paper we are analyzing the impact of mobility on the QoS parameters (Throughput, Average Jitter a...

The definition of suitable abstractions and models for identifying, understanding and managing Quality of Service (QoS) constraints is a challenging issue of the Service Oriented Computing paradigm. In this paper we introduce a process calculus where QoS attributes are first class objects. We identify a minimal set of primitives that allow capturing in an abstract way the ability to control and...

In an open environment populated by large numbers of services, automated service composition is a major challenge. In such a setting the efficient interaction of directory-based service discovery with different service composition algorithms is crucial. In this paper we present a directory with dedicated features for service composition. In order to optimize the interaction of the directory wit...

introduction. shiraz university of medical sciences presents surgical facilities in two services, the morning and the afternoon services. in this study,the number and type of ent operations performed in these two services during a 12 months period in khalili hospital were compared to find out the differences between the operations performed in these services and the role they have in the educat...