Scatter/Gather browsing of web service QoS data

Search-based QoS ranking prediction for web services in cloud environments

“…QoS is an important way of describing non-functional characteristics of Web services, and is also essential for identifying an appropriate service from functionally-equivalent ones [17]. Depending on whether a higher value indicates better or worse quality, QoS attributes can be classified as either positive indicators, such as throughput, reliability and availability; or negative indicators such as response-time and cost.…”

“…Algorithm PSO for Sequence Optimization for each sequence seq j (t) do 5. update the current sequence seq j (t) using formulas (12) and (13), and get seq j (t + 1); 6. calculate the fitness of the new particle, denoted fit(seq j (t + 1)); 7. if fit(seq j (t + 1)) > pbest j then 8. set seq j (t + 1) as the new pbest j ; 9. end if 10. if fit(seq j (t + 1)) > gbest then 11. update the corresponding sequence of gbest; 12. end if 13. end for 14. if gbest falls into a trap then 15. some perturbations are exerted on the current best solution; 16. end if 17.…”

Concepts and Derivatives of Web Services

“… Availability:determines that the web services are ready for immediate use and a service is available or not. If the value is high it shows the service is ready to use while if it is small it means that the service can be used only in particular time [11].  Flexibility: represents how a service can function correctly when the input is invalid, incomplete or conflict.…”

The Evaluation Model of Network QoS Based on Intelligent Water Droplets Algorithm

“…e way, to efficiently implement service selection and combination among different quality of service (QoS) candidate service sets, has become a key link in building a highly reliable and high-quality combined service. QoSbased Web service recommendation can be divided into two categories [1][2][3][4][5][6][7]: one is to model the service selection with multiple QoS constraints as a directed acyclic graph optimal path problem and give a service selection algorithm based on this model; the other is to establish QoS ontology with the description and deduction ability of which the accuracy of service matching can be improved.…”