Employing Commercial Off-the-Shelf (COTS) software products as components in large-scale long-lived systems has been proposed as a way to reduce both implementation and operating cost for the user communities. While this may be the case, the actual benefits have not been confirmed. However, there is factual evidence that some of the suggested cost savings will be offset by the need to address a...

Handover techniques are essential components of the heterogeneous wireless networks architecture development. Providing quality of service in conditions of seamless mobility is the major prerequisite for vertical handover high functionality and scalability. In this paper, the perspective vertical handover techniques, based on radio link quality and merit function of access network, are systemat...

Computer performance evaluation is a key technology for research in computer architecture. The continuous growth in complexity of computer systems is making this task increasingly complex. In general, the problem of developing effective performance evaluation techniques can be stated as finding the best trade-off between accuracy and speed. This optimal trade-off is dependent on the particular ...

Today there are many techniques for web service compositions. Evaluation of quality parameters has great impact on evaluation of final product. BPEL is one of those techniques that several researches have been done on its evaluation. However, there are few researches on evaluation of QoS in eflow. This research tries to evaluate performance and reliability of eflow and BPEL through mapping them...