QoS-based Web Service Discovery Research Articles

Context Aware QOS based Web Service Discovery

This work concentrates on context of the execution environment in service selection process due to dynamically varying QoS attributes in service execution environment. In this paper, a context aware QoS Web Service(WS) description and discovery is proposed to overcome the issues related to QoS requirements in WS. In the proposed scheme, OWL-Q with OWL CONtext ONtology (CONON) ontology is modeled to provide the WS description with context aware QoS descriptions. To discover the most appropriate WS based on context and QoS descriptions, a context aware QoS semantic matchmaking algorithm is newly proposed based on Constraint Satisfaction Optimization Approach (CSOP). An efficient User Priority based Ranking (UPR) mechanism is performed based on user preferences to rank the matched WSs. Consequently, precision and recall of proposed context aware QoS WS discovery is compared with the existing QoS WS discovery and conclude that proposed approach achieves high precision and recall than existing QoS based approach.

Efficient Discovery and Ranking of Web Services Using Non-functional QoS Requirements for Smart Grid Applications

Abstract Web service discovery is the important process and traditional methods use keyword-based search to locate the appropriate web service. This method may not yield good results. Non-functional QoS parameters of a web service play a vital role in ranking a web service. Moreover, standards such as UDDI, WSDL and SOAP have potential of providing QoS based web service discovery. In this paper, a new method is proposed to rank the web services. The proposed method computes relevancy function value of the web services and normalization is performed. This normalized result is used to rerank the web service. The selection of appropriate web service provide user to access smart grid over internet. The experimental results show that the proposed method is effective in selecting appropriate web services than traditional methods

A Service Publishing and Service Location Algorithm for Internet of Things

The designation idea and the hierarchy model for the WSDS based on double hierarchy topology have been described. In order to support QoS-based Web services publish and discovery, the QoS broker mechanism is introduced into the traditional Web service discovery model. On the basis of these, according to the characteristics of QoS requirements of different users, a QoS-based Web service discovery algorithm is proposed. Put forward dynamic tuple model, give two-phase service location algorithm adapting double hierarchy topology network, and then compare and test with the correlative work of UDDI. Hierarchy model is introduced to defining dynamic tuple model in the data-level for resolving the heterogeneity between diversified data source and data modal. The unified publish and query API customized to implement unified accessing mode in the abstract level. The scalability, agility and robustness of the WSDS are assured by a double hierarchy topology structure. The experiment result indicate, double hierarchy topology system has obvious self-organization and well scalability, and adopt to the independence of web service, dynamic change and strong distributing, at one time, two-phase service location algorithm has well abilities of service location.

Requirements for QoS-Based Web Service Description and Discovery

The goal of service oriented architectures (SOAs) is to enable the creation of business applications through the automatic discovery and composition of independently developed and deployed (Web) services. Automatic discovery of Web services (WSs) can be achieved by incorporating semantics into a richer WS description model (WSDM) and by the use of semantic Web (SW) technologies in the WS matchmaking and selection (i.e., discovery) process. A sufficiently rich WSDM should encompass not only functional but also nonfunctional aspects like quality of service (QoS). QoS is a set of performance and domain-dependent attributes that has a substantial impact on WS requesters' expectations. Thus, it can be used for distinguishing between many functionally equivalent WSs that are available nowadays. This paper starts by defining QoS in the context of WSs. Its main contribution is the analysis of the requirements for a semantically rich QoS-based WSDM and an accurate, effective QoS-based WS Discovery (WSDi) process. In addition, a road map of extending current WS standard technologies for realizing semantic, functional, and QoS-based WSDi, respecting the above requirements, is presented.